CN109599629B - Temperature adjusting method and temperature adjusting system for vehicle-mounted battery - Google Patents

Temperature adjusting method and temperature adjusting system for vehicle-mounted battery Download PDF

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Publication number
CN109599629B
CN109599629B CN201710944061.7A CN201710944061A CN109599629B CN 109599629 B CN109599629 B CN 109599629B CN 201710944061 A CN201710944061 A CN 201710944061A CN 109599629 B CN109599629 B CN 109599629B
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battery
temperature
power
cooling
vehicle
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CN109599629A (en
Inventor
伍星驰
谈际刚
王洪军
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BYD Co Ltd
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BYD Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/62Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625Vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H1/00278HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/615Heating or keeping warm
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/617Types of temperature control for achieving uniformity or desired distribution of temperature
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/63Control systems
    • H01M10/635Control systems based on ambient temperature
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00Batteries for particular applications
    • H01M2220/20Batteries in motive systems, e.g. vehicle, ship, plane
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses a temperature adjusting method and a temperature adjusting system of a vehicle-mounted battery, wherein the method comprises the following steps: respectively acquiring temperature regulation required power and temperature regulation actual power of a plurality of batteries; respectively acquiring the zone temperatures and the set air conditioner temperatures of a plurality of zones in the vehicle; and adjusting the opening degrees of the plurality of in-vehicle cooling circuits, the plurality of battery cooling circuits and the plurality of refrigeration circuits according to the temperature adjustment required power, the temperature adjustment actual power, the plurality of zone temperatures and the air conditioner set temperature, wherein the plurality of battery cooling circuits are communicated with one another. The invention distributes the refrigerating capacity of the batteries and all areas in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the batteries is overhigh or overlow, maintains the temperature of the batteries in a preset range, and can balance the temperature of all areas in the carriage and the temperature among all batteries.

Description

Temperature adjusting method and temperature adjusting system for vehicle-mounted battery
Technical Field
The invention relates to the technical field of automobiles, in particular to a temperature adjusting method and a temperature adjusting system of a vehicle-mounted battery.
Background
At present, the performance of a vehicle-mounted battery of an electric vehicle is greatly influenced by the climate environment, and the performance of the vehicle-mounted battery is influenced by too high or too low ambient temperature, so that the temperature of the vehicle-mounted battery needs to be adjusted to maintain the temperature within a preset range.
In the related art, in regions with hot climate environments, a battery cooling system needs to be added to an electric vehicle to reduce the temperature of a vehicle-mounted battery when the temperature of the battery is too high; in areas with cold climate, it is necessary to add a battery heating system to the electric vehicle to raise the temperature of the vehicle battery when the temperature is too low.
However, in hot summer and cold winter, the above method cannot simultaneously solve the problems of too high temperature and too low temperature of the vehicle-mounted battery, and the method for adjusting the temperature of the vehicle-mounted battery is rough, so that the heating power and the cooling power of each battery cannot be accurately controlled according to the actual state of each battery, and the temperature of each area in the vehicle compartment cannot be equalized when the temperature of the battery is adjusted.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a method for adjusting the temperature of a vehicle-mounted battery, which allocates the cooling capacity of the battery and each area in a vehicle compartment according to the actual state of each battery, the temperatures of a plurality of areas in the vehicle compartment and the set temperature of an air conditioner, and can adjust the temperature not only when the temperature of the battery is too high or too low to maintain the temperature of the battery within a preset range, but also equalize the temperatures of the areas in the vehicle compartment and the batteries.
Another object of the present invention is to provide a temperature regulation system of a vehicle-mounted battery.
In order to achieve the above object, an embodiment of the invention provides a method for adjusting the temperature of a vehicle-mounted battery, including the following steps: respectively acquiring temperature regulation required power and temperature regulation actual power of the plurality of batteries; respectively acquiring the zone temperatures and the set air conditioner temperatures of a plurality of zones in the vehicle; according to the demand power for temperature regulation, the actual power for temperature regulation, a plurality of regional temperature with the air conditioner temperature setting is right a plurality of in-car cooling circuit, a plurality of battery cooling circuit with the aperture of a plurality of refrigeration circuit is adjusted, wherein, communicate each other between a plurality of battery cooling circuit, and according to the demand power for temperature regulation of battery with the actual power for temperature regulation adjusts the refrigeration capacity aperture that a plurality of compressors provided to the battery cooling circuit that the battery corresponds.
According to the temperature adjusting method of the vehicle-mounted battery, the required power for temperature adjustment and the actual power for temperature adjustment of the plurality of batteries are respectively obtained, then the zone temperatures and the set air conditioner temperatures of the plurality of zones in the vehicle are respectively obtained, and the opening degrees of the plurality of in-vehicle cooling circuits, the plurality of battery cooling circuits and the plurality of refrigeration circuits are adjusted according to the required power for temperature adjustment, the actual power for temperature adjustment, the plurality of zone temperatures and the set air conditioner temperatures. Therefore, the method distributes the cooling capacity of the batteries and the cooling capacity of each area in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the batteries is too high or too low to maintain the temperature of the batteries in a preset range, and can balance the temperature of each area in the carriage and the temperature among the batteries.
In order to achieve the above object, according to another embodiment of the present invention, a temperature adjustment system for a vehicle-mounted battery includes: a plurality of refrigeration circuits, wherein each refrigeration circuit comprises a compressor, a condenser connected to the compressor; a plurality of in-vehicle cooling circuits connected to the plurality of refrigeration circuits; a plurality of battery cooling circuits connected to the plurality of refrigeration circuits, wherein the plurality of battery cooling circuits are in communication with each other; the battery temperature adjusting device comprises a plurality of battery temperature adjusting modules, a plurality of compressors and a plurality of batteries, wherein the battery temperature adjusting modules are respectively connected with a plurality of battery cooling loops and used for acquiring temperature adjusting demand power and temperature adjusting actual power, acquiring regional temperatures and air conditioner set temperatures of a plurality of regions in a vehicle, and according to the temperature adjusting demand power, the temperature adjusting actual power and the air conditioner set temperatures are right among the plurality of in-vehicle cooling loops, the plurality of battery cooling loops and the opening degrees of the plurality of refrigerating loops are adjusted, and according to the temperature adjusting demand power and the temperature adjusting actual power of the batteries are adjusted, and the refrigerating capacity opening degrees provided by the battery cooling loops corresponding to the batteries are obtained by the compressors.
According to the temperature adjusting system of the vehicle-mounted battery, the required temperature adjusting power and the actual temperature adjusting power are obtained through the battery temperature adjusting module, the zone temperatures and the set air conditioner temperatures of a plurality of zones in the vehicle are obtained, the opening degrees of a plurality of in-vehicle cooling loops, a plurality of battery cooling loops and a plurality of refrigerating loops are adjusted according to the required temperature adjusting power, the actual temperature adjusting power, the zone temperatures and the set air conditioner temperatures, and the opening degrees of the refrigerating capacity provided by a plurality of compressors to the battery cooling loops corresponding to the battery are adjusted according to the required temperature adjusting power and the actual temperature adjusting power of the battery. Therefore, the system distributes the cooling capacity of the batteries and all areas in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the batteries is too high or too low to maintain the temperature of the batteries in a preset range, and can balance the temperature of all areas in the carriage and the temperature among all the batteries.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
Fig. 1A to 1B are schematic diagrams of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a first embodiment of the invention;
fig. 2 is a schematic diagram of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a second embodiment of the invention;
fig. 3 is a schematic diagram of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a third embodiment of the invention;
FIG. 3A is a schematic diagram of the operation of a controller according to one embodiment of the present invention;
fig. 4 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a first embodiment of the invention;
fig. 5 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a second embodiment of the invention;
fig. 6 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a third embodiment of the invention;
fig. 7 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a fourth embodiment of the invention;
fig. 8 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a fifth embodiment of the invention;
fig. 9 is a schematic diagram of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a fourth embodiment of the invention;
fig. 10 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a sixth embodiment of the invention;
Fig. 11A to 11C are schematic diagrams of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a seventh embodiment of the invention;
fig. 12a to 12b are flowcharts of a temperature adjustment method of a vehicle-mounted battery according to a sixth embodiment of the invention;
fig. 13 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a seventh embodiment of the invention;
14A-14B are flowcharts of a temperature adjustment method of a vehicle according to an eighth embodiment of the invention;
fig. 15 is a flowchart of a temperature adjustment method of a vehicle according to a first embodiment of the invention;
fig. 16 is a flowchart of a temperature adjustment method of a vehicle according to a second embodiment of the invention;
fig. 17 is a flowchart of a temperature adjustment method of a vehicle according to a third embodiment of the invention;
fig. 18 is a flowchart of a temperature adjustment method of a vehicle according to a fourth embodiment of the invention;
fig. 19A to 19B are schematic diagrams of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to an eighth embodiment of the invention;
fig. 20 is a schematic diagram of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a ninth embodiment of the invention;
FIG. 21 is a schematic view of the distribution of outlets according to an embodiment of the present invention;
Fig. 22 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to an eighth embodiment of the invention;
fig. 23 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a ninth embodiment of the invention;
fig. 24 is a schematic diagram of a temperature regulation system flow path structure of a vehicle-mounted battery according to a tenth embodiment of the invention;
fig. 25 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a tenth embodiment of the invention;
fig. 26 is a schematic diagram of a temperature regulation system flow path structure of a vehicle-mounted battery according to an eleventh embodiment of the invention;
fig. 26A to 26B are schematic diagrams of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a twelfth embodiment of the invention;
fig. 27 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to an eleventh embodiment of the invention;
fig. 28 is a schematic diagram of a flow path structure of a temperature regulation system of a vehicle-mounted battery according to a thirteenth embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
When the number of batteries of the vehicle is 1, as shown in fig. 1A and 1B, the temperature adjustment system of the vehicle-mounted battery includes: compressor 1, condenser 2, battery cooling branch 4 and battery temperature regulation module 5.
Wherein the condenser 2 is connected to the compressor 1 and the battery cooling branch 4 is connected between the compressor 1 and the condenser 2. The battery temperature adjusting module 5 is connected with the battery cooling branch 4 and is used for obtaining the temperature adjusting required power P1 of the battery 6 and the temperature adjusting actual power P2 of the battery, and adjusting the temperature of the battery 6 according to the temperature adjusting required power P1 and the temperature adjusting actual power P2. The compressor 1 and the condenser 2 constitute a refrigeration branch.
Specifically, the temperature-adjustment required power P1 is the temperature-adjustment power required by the battery when the temperature of the battery is adjusted to the target temperature. The battery temperature adjustment actual power P2 is the temperature adjustment power actually obtained by the battery when the battery is currently temperature-adjusted. The target temperature is a set value and can be preset according to the actual situation of the vehicle-mounted battery, for example, in winter, the outdoor environment temperature is low, the battery needs to be heated, the target temperature can be set to about 10 ℃, in summer, the battery needs to be cooled, and the target temperature can be set to about 35 ℃. The battery temperature adjustment module 5 acquires the temperature adjustment required power P1 of the battery 6 and the temperature adjustment actual power P2 of the battery 6, and adjusts the powers of the compressor 1 and the heater according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 to adjust the temperature of the battery 6. As shown in fig. 1A, when the cooling liquid of the air conditioner is not connected to the battery temperature adjusting module 5, two pipelines are disposed in the battery cooling branch 4, a first pipeline is communicated with the compressor 1, and a second pipeline is communicated with the battery temperature adjusting module 5, wherein the first pipeline and the second pipeline are independently disposed in proximity to each other, so that media (flowing media such as refrigerant, water, oil, air, or phase change materials, or other chemicals) are independent from each other. When the temperature of the battery 6 is too high, the refrigeration function of the vehicle-mounted air conditioner is started, the cooling function of the battery is started, and the flowing directions of cooling liquid (such as a refrigerant) in the first pipeline and the second pipeline are respectively as follows: compressor 1-condenser 2-battery cooling branch 4-compressor 1; the battery cooling branch 4, the battery temperature adjusting module 5, the battery 6, the battery temperature adjusting module 5 and the battery cooling branch 4.
As shown in fig. 1B, when the cooling liquid of the air conditioner is connected to the battery temperature adjustment module 5, the flow direction of the cooling liquid is: the system comprises a compressor 1, a condenser 2, a battery cooling branch 4, a battery temperature adjusting module 5, a battery 6, a battery temperature adjusting module 5 and the compressor 1.
In the above two embodiments, the vehicle air conditioner is only used for cooling and heating the battery 6, and the temperature regulation system may also cool both the vehicle cabin and the battery 6 by the vehicle air conditioner. When the system cools both the vehicle cabin and the battery 6 by the vehicle air conditioner, as shown in fig. 2, the temperature adjustment system may further include an in-vehicle cooling branch 3, and the in-vehicle cooling branch 3 is connected between the compressor 1 and the condenser 2.
When the temperature in the vehicle is too high, the cooling function in the vehicle is started, and the flowing direction of the cooling liquid is as follows: compressor 1-condenser 2-in-vehicle cooling branch 3-compressor 1. When the temperature of the battery 6 is too high, the battery cooling function is started, and the flow directions of the cooling liquid in the first pipeline and the second pipeline are as follows: compressor 1-condenser 2-battery cooling branch 4-compressor 1; the battery cooling branch 4, the battery temperature adjusting module 5, the battery 6, the battery temperature adjusting module 5 and the battery cooling branch 4. Therefore, the heating power and the cooling power of the vehicle-mounted battery can be accurately controlled according to the actual state of the battery, so that the temperature of the vehicle-mounted battery is adjusted when the temperature of the vehicle-mounted battery is too high or too low, the temperature of the vehicle-mounted battery is maintained in a preset range, the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided, and the temperature in the vehicle can meet the requirement under the condition that the temperature of the battery meets the requirement.
Further, according to an embodiment of the present invention, as shown in fig. 3, the battery cooling branch 4 may include a heat exchanger 41, and the heat exchanger 41 includes a first pipe and a second pipe, the second pipe is connected to the battery temperature adjusting module 5, the first pipe is communicated with the compressor 1, wherein the first pipe and the second pipe are independently disposed adjacent to each other. In the embodiment of the invention, the physical position of the heat exchanger 41 can be located in a loop where the vehicle-mounted air conditioner compressor 1 is located, so that the vehicle-mounted air conditioner can be conveniently factory-debugged, the vehicle-mounted air conditioner can be independently supplied and assembled, and meanwhile, the vehicle-mounted air conditioner only needs to be filled with a medium once in the installation process. The physical location of the heat exchanger 41 may also be located in the circuit where the battery 6 is located, and the physical location of the heat exchanger 41 may also be provided independently of the circuit where the vehicle air conditioner compressor 1 is located and the circuit where the battery 6 is located.
As shown in fig. 3, the battery temperature adjusting module 5 may include: a flow path (not specifically shown) that regulates the temperature of the battery is provided in the battery 6. A pump 51, a medium container 52, a heater 53, and a controller (not specifically shown in the drawings) connected between the flow path and the heat exchanger 41. Wherein the controller acquires the temperature regulation required power P1 of the battery 6 and the temperature regulation actual power P2 of the battery, and regulates the temperature of the battery 6 according to the temperature regulation required power P1 and the temperature regulation actual power P2 of the battery. The in-vehicle cooling branch 3 may include: an evaporator 31, a first expansion valve 32, and a first electronic valve 33. The battery cooling branch 4 may further include a second expansion valve 42 and a second electronic valve 43.
It is understood that the heat exchanger 41 may not be provided in the battery cooling branch 4, and when the heat exchanger 41 is not provided, a cooling medium flows in the battery cooling branch 4. If the heat exchanger 41 is provided, the refrigerant flows through the first pipe of the battery cooling branch 4, the cooling liquid flows through the second pipe, and the refrigerant flows through the in-vehicle cooling branch 3.
According to an embodiment of the present invention, as shown in fig. 3, the cell temperature adjusting module 5 further includes a first temperature sensor 55 provided at an inlet of the flow path, a second temperature sensor 56 provided at an outlet of the flow path, and a flow rate sensor 57. It will be appreciated that the inlet and outlet positions of the flow path are not absolute, but rather are determined by the direction of rotation of the pump 51.
Specifically, as shown in fig. 3A, the controller may include a battery management controller, a battery thermal management controller, and an on-board air conditioning controller. The battery thermal management controller CAN be electrically connected with the first temperature sensor 55, the second temperature sensor 56 and the flow rate sensor 57, CAN communicate with the pump 51 and the heater 53, and obtains temperature adjustment actual power P2, controls the rotation speed of the pump 51 and controls the power of the heater 53 according to the specific heat capacity of the medium, the density of the medium and the cross-sectional area of the flow path. The battery management controller collects current flowing through the battery and the temperature of the battery, obtains temperature regulation required power P1 according to the target temperature and the target time t of the battery, the specific heat capacity C of the battery, the mass M of the battery and the internal resistance R of the battery, and controls the vehicle-mounted air conditioner controller to start or stop working. The vehicle-mounted air conditioner controller is electrically connected with the expansion valve and the electronic valve, CAN communicate with the battery management controller, the battery thermal management controller and the compressor 1 in a CAN mode, and controls the power P of the compressor, the expansion valve and the electronic valve to be opened and closed according to the temperature regulation required power P1 acquired by the battery management controller and the temperature regulation actual power P2 acquired by the battery thermal management controller, so that the purpose of controlling the heat exchange amount is achieved.
The heat exchanger 41 can be a plate heat exchanger, and the plate heat exchanger can be installed inside the vehicle-mounted air conditioner, so that the whole refrigerant loop is inside the vehicle-mounted air conditioner, the vehicle-mounted air conditioner is convenient to factory debug, the vehicle-mounted air conditioner can supply and assemble independently, and meanwhile, the vehicle-mounted air conditioner only needs to be filled with refrigerant once in the installation process.
The coolant flows into the battery 6 from the inlet of the flow path and flows out from the outlet of the flow path, thereby achieving heat exchange between the battery 6 and the coolant.
The pump 51 is primarily used to provide power, and the media container 52 is primarily used to store and receive coolant to the temperature regulation system, and the coolant in the media container 52 can be automatically replenished when the coolant in the temperature regulation system is reduced. The heater 53 may be a PTC (Positive Temperature Coefficient, broadly referred to as a semiconductor material or a component having a large Positive Temperature Coefficient) heater, and may communicate with a Controller through a Controller Area Network (CAN), provide heating power for a Temperature regulation system of the vehicle-mounted battery, and be controlled by the Controller, and the heater 53 may be disposed at any position between the medium container 52 and the first Temperature sensor 55. That is, the heater 53 is not in direct contact with the battery 6, and has high safety, reliability, and practicality.
The first temperature sensor 55 is used to detect the temperature of the cooling fluid at the inlet of the flow path, and the second temperature sensor 56 is used to detect the temperature of the cooling fluid at the outlet of the flow path. Flow rate sensor 57 is used to detect information on the flow rate of cooling fluid in the pipe in the temperature regulation system. The first electronic valve 33 is used for controlling the opening and closing of the in-vehicle cooling branch 3, and the first expansion valve 32 is used for controlling the flow rate of the cooling liquid in the in-vehicle cooling branch 3. The second electronic valve 43 is used for controlling the opening and closing of the battery cooling branch 4, and the second expansion valve 42 can be used for controlling the flow of the cooling liquid in the battery cooling branch 4.
It is understood that, as shown in fig. 1B, when the cooling liquid of the air conditioner is introduced into the battery temperature adjusting module 5, the heat exchanger 41, the pump 51, and the medium container 52 need not be provided. The mode that this kind of on-vehicle air conditioner return circuit and battery cooling branch 4 communicate can improve cooling efficiency, has avoided the incomplete problem of heat transfer of heat exchanger 41 department, has stopped the heat transfer loss because of the heat transfer efficiency of heat exchanger brings promptly. In a manner that the cooling liquids of the on-board air conditioning circuit and the battery cooling branch are independent from each other, the power of the compressor in the on-board air conditioning circuit is the actual power of the compressor for cooling the battery after considering the heat exchange efficiency of the heat exchanger 41 and the like, and the compressor power P described later is the power of the compressor for cooling the battery described herein (it can be understood that the maximum (or rated) cooling power of the compressor described later is the maximum (or rated) power of the compressor multiplied by the heat exchange efficiency). The heat exchange efficiency can be a set fixed value and is measured after the whole system is built; the heat exchange efficiency can be obtained in real time, the actual heat exchange power can be known by adding temperature sensors in the front and at the back of the heat exchanger and adding a flow velocity sensor in a loop where the heat exchanger is located, and the ratio of the actual temperature regulation power P2 of the battery to the actual heat exchange power is the heat exchange efficiency.
How the battery temperature adjustment module 5 obtains the temperature-adjustment required power P1 and the temperature-adjustment actual power P2 of the battery 6 is described below with reference to specific embodiments.
According to one embodiment of the invention, the controller may be configured to obtain a first parameter when the battery is turned on for temperature adjustment, and generate a first temperature adjustment required power of the battery according to the first parameter, and obtain a second parameter when the battery is temperature-adjusted, and generate a second temperature adjustment required power of the battery according to the second parameter, and generate a temperature adjustment required power P1 of the battery according to the first temperature adjustment required power of the battery and the second temperature adjustment required power of the battery.
Further, according to an embodiment of the present invention, the first parameter is an initial temperature and a target temperature at which the temperature adjustment of the battery 6 is turned on and a target time T from the initial temperature to the target temperature, and the controller acquires a first temperature difference Δ T between the initial temperature and the target temperature1And according to the first temperature difference DeltaT1And the target time t generates the first temperature regulation required power.
Further, the controller generates the first temperature regulation required power by the following formula (1):
ΔT1*C*M/t (1),
wherein, Delta T1Is a first temperature difference between the initial temperature and the target temperature, t is the target time, C is the specific heat capacity of the battery 6, and M is the mass of the battery 6.
The second parameter is the average current I of the battery 6 in the preset time, and the controller generates the second temperature regulation required power by the following formula (2):
I2*R, (2),
where I is the average current and R is the internal resistance of the battery 6.
When cooling battery 6, P1 ═ Δ T1*C*M/t+I2R; when the battery 6 is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to one embodiment of the present invention, the controller generates the second temperature difference Δ T according to the inlet temperature detected by the first temperature sensor 55 and the outlet temperature detected by the second temperature sensor 56, respectively2And according to the second temperature difference DeltaT of each battery2And the flow rate v detected by the flow rate sensor 57 generates the temperature-regulated actual power P2 of the battery.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v s rho, s is the cross section area of the flow path, v is the flow velocity of the cooling liquid, and rho is the density of the cooling liquid.
The flow velocity sensor may be replaced with a flow sensor, where m is Q ρ, and Q is a flow rate of the coolant flowing through the cross-sectional area of the flow path per unit time measured by the flow sensor.
Specifically, after the vehicle is powered on, the battery management controller determines whether the vehicle needs to be temperature-regulated, and if it is determined that the vehicle needs to be temperature-regulated, for example, the temperature of the battery 6 is too high, the vehicle-mounted air-conditioning controller sends information for turning on the temperature regulation function to the vehicle-mounted air-conditioning controller through CAN communication, and after the vehicle-mounted air-conditioning controller turns on the temperature regulation function, the vehicle-mounted air-conditioning controller sends heat exchange information to the battery thermal management controller, and at the same time, the vehicle-mounted controller controls the second electronic valve 43 to be turned on, and the battery thermal management controller controls the pump 51 to.
Meanwhile, the battery management controller obtains an initial temperature (i.e., a current temperature), a target temperature, and a target time t from the initial temperature to the target temperature of the battery 6, where the target temperature and the target time t may be preset according to an actual situation, and calculates a first temperature adjustment required power of the battery according to formula (1). The battery management controller also obtains the average current I of the battery 6 in a preset time, and calculates a second temperature regulation required power of the battery according to the formula (2). Then, the battery management controller calculates a temperature regulation required power P1 (required power that regulates the temperature of the battery 6 to a target temperature for a target time) from the first temperature regulation required power and the second temperature regulation required power of the battery 6, where P1 ═ Δ T when cooling the battery 6 1*C*M/t+I2R, when the battery 6 is heated, P1 ═ Δ T1*C*M/t-I2*R。
The battery thermal management controller acquires temperature information detected by the first temperature sensor 55 and the second temperature sensor 56, acquires flow rate information detected by the flow rate sensor 57, and calculates the temperature-adjusted actual power P2 of the battery 6 according to equation (3).
Finally, the vehicle air conditioner controller controls the output power of the compressor and the opening degree of the second expansion valve 42 according to the temperature regulation required power P1 and the temperature regulation actual power P2 of the battery 6, and optionally, the battery thermal management controller regulates the rotation speed of the pump 51. If the temperature regulation demand power P1 is greater than the temperature regulation actual power P2, the power of the compressor is increased and the opening degree of the second expansion valve 42 is increased according to the difference between the temperature regulation demand power P1 and the temperature regulation actual power P2, and the rotation speed of the pump 51 is optionally increased; if the temperature-adjustment required power P1 is less than the temperature-adjustment actual power P2, the power of the compressor is reduced and the opening degree of the second expansion valve 42 is reduced according to the difference between the temperature-adjustment required power P1 and the temperature-adjustment actual power P2, and the rotation speed of the pump 51 is optionally reduced.
For example, as can be seen from the above embodiment, the temperature regulation demand power P1 is composed of two parts, when the battery 6 needs to be cooled, the initial temperature of the battery 6 is 45 ℃, the target temperature is 35 ℃, and the heat quantity to be dissipated when the battery is lowered from 45 ℃ to 35 ℃ is fixed, and is expressed by the formula (1) as Δ T 1The direct calculation of C M/t may be obtained, i.e. the first thermostat demand power. Meanwhile, during the cooling process of the battery 6, there are discharging and charging processes, which generate heat, and since the discharging or charging current of the battery 6 is changed, the heat of the part can also be directly obtained by detecting the average current I of the battery, which is expressed by formula (2), i.e. I2R, directly calculating the heating power of the current battery 6, i.e., the second temperature adjustment required power. The cooling completion time of the present invention is set based on the target time t (t may be changed according to the user's needs or the actual design condition of the vehicle). After the target time T required for cooling completion is determined, the temperature adjustment required power P1, P1 ═ Δ T, required for cooling of the current battery 6 can be estimated1*C*M/t+I2R. If the heating function is started, the temperature regulation required power P1 is delta T1*C*M/t-I2R, i.e., the greater the discharge or charge current of the battery 6 during the heating of the battery 6, the smaller the required heating power, i.e., the temperature regulation demand power P1.
How the temperature of the batteries 6 is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 according to each battery 6 will be described below with reference to specific embodiments.
According to an embodiment of the invention, the controller is further configured to detect a temperature of the battery and control the temperature adjustment system to enter the cooling mode when the temperature of the battery is greater than a first temperature threshold, and control the temperature adjustment system to enter the heating mode when the temperature of the battery is less than a second temperature threshold. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, where the first temperature threshold is generally greater than the second temperature threshold, for example, the first temperature threshold may be 40 ℃ and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the battery management controller detects the temperature of the battery 6 in real time and makes a judgment. If the temperature of the battery 6 is higher than 40 ℃, which indicates that the temperature of the battery 6 is too high at this time, in order to avoid the influence of the high temperature on the performance of the battery 6, the temperature of the battery 6 needs to be reduced, the temperature regulation system is controlled to enter a cooling mode, and the start information of the battery cooling function is sent to the vehicle-mounted air conditioner controller. The in-vehicle air conditioning controller controls the second electronic valve 43 to open after receiving the battery cooling function start information, so that the coolant exchanges heat with the battery 6 to reduce the temperature of the battery 6. As shown in fig. 3, when the temperature regulation system operates in the cooling mode, the flow directions of the cooling liquid in the corresponding first and second pipes in the loop in which the battery 6 is located are: compressor 1-condenser 2-second electronic valve 43-second expansion valve 42-heat exchanger 41-compressor 1; the medium container 52, the heat exchanger 41, the heater 53 (closed), the pump 51, the first temperature sensor 55, the battery 6, the second temperature sensor 56, the flow rate sensor 57 and the medium container 52 are circulated, heat exchange is carried out at the heat exchanger 41, and the temperature reduction of the battery 6 is realized.
And if the temperature of the battery 6 is lower than 0 ℃, which indicates that the temperature of the battery 6 is too low at this time, in order to avoid the influence of low temperature on the performance of the battery 6, the temperature of the battery 6 needs to be raised, and the battery management controller controls the temperature regulating system to enter a heating mode and sends the start information of the battery heating function to the vehicle-mounted air conditioner controller. The vehicle-mounted air conditioner controller controls the second electronic valve 43 to be closed after receiving the starting information of the battery heating function, and meanwhile, the battery thermal management controller controls the heater 53 to be opened so as to provide heating power for the temperature adjusting system. When the temperature regulating system operates in the heating mode, the flow direction of the cooling liquid is as follows: medium container 52-heat exchanger 41-heater 53 (on) -pump 51-first temperature sensor 55-battery 6-second temperature sensor 56-flow rate sensor 57-medium container 52; this cycle realizes the temperature rise of the battery 6.
According to an embodiment of the present invention, when the temperature adjustment system is operated in the cooling mode and the temperature adjustment required power P1 of the battery 6 is greater than the corresponding temperature adjustment actual power P2 of the battery, the controller obtains the power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2, and increases the power of the compressor for cooling the battery 6 according to the power difference, or increases the flow rate of the cooling liquid of the battery 6 to increase the cooling power of the battery 6, and decreases the power of the compressor or keeps the power of the compressor constant, or adjusts and decreases the flow rate of the cooling liquid of the battery to decrease the cooling power of the battery 6 when the temperature adjustment required power P1 of the battery 6 is less than or equal to the temperature adjustment actual power P2.
Specifically, when the temperature regulation system works in the cooling mode, the battery management controller obtains the temperature regulation required power P1 of the battery, the battery management controller obtains the temperature regulation actual power P2 of the battery, and the vehicle-mounted air conditioner controller judges according to the temperature regulation required power P1 and the temperature regulation actual power P2. If the temperature adjustment required power P1 of the battery 6 is greater than the temperature adjustment actual power P2, it means that if the temperature reduction of the battery 6 cannot be completed within the target time according to the current cooling power or the coolant flow rate, the in-vehicle air conditioning controller acquires the power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2, and increases the power of the compressor 1 according to the power difference, or increases the coolant flow rate of the battery, that is, increases the opening degree of the second expansion valve 42, to increase the cooling power of the battery, wherein the larger the power difference between the temperature adjustment actual power P1 and the temperature adjustment actual power P2 is, the more the power of the compressor 1 and the coolant flow rate of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. And if the temperature-adjusted actual power P1 of the battery 6 is less than or equal to the temperature-adjusted actual power P2, the on-board air conditioning controller may keep the power of the compressor 1 unchanged or appropriately reduce the power of the compressor 1, or reduce the flow rate of the coolant of the battery, i.e., reduce the opening degree of the second expansion valve 42, to reduce the cooling power of the battery. When the temperature of the battery 6 is lower than 35 ℃, the cooling of the battery 6 is completed, the battery management controller sends information for turning off the temperature regulation function to the vehicle-mounted air conditioner controller through the CAN communication, and the vehicle-mounted air conditioner controller controls the second electronic valve 43 to be turned off. If the temperature of the battery 6 is still higher than 35 c after the thermostat system has entered the cooling mode for a longer time, for example, after 1 hour, the on-board air conditioning controller increases the power of the compressor 1 appropriately to allow the battery to finish cooling as soon as possible.
According to an embodiment of the present invention, when the temperature adjustment system is operated in the heating mode and the temperature adjustment required power P1 of the battery is greater than the temperature adjustment actual power P2, the controller obtains a power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2, and increases the power of the heater 53 for heating the battery according to the power difference, or adjusts to increase the flow rate of the cooling liquid of the battery to increase the heating power of the battery, and when the temperature adjustment required power P1 of the battery is less than or equal to the temperature adjustment actual power P2, the decreased power, or keeps the power of the heater 53 constant, or adjusts to decrease the flow rate of the cooling liquid of the battery to decrease the heating power of the battery.
Specifically, when the temperature regulation system operates in the heating mode, the battery management controller acquires the P1 of the battery, and the battery management controller acquires the temperature regulation actual power P2 of the battery. If the temperature regulation required power P1 of the battery 6 is greater than the temperature regulation actual power P2, indicating that the temperature rise of the battery 6 cannot be completed within the target time according to the current heating power or coolant flow rate, the battery thermal management controller obtains the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increases the power of the heater 53 for heating the battery 6 according to the power difference, or adjusts to increase the coolant flow rate of the battery, for example, the rotation speed of the pump 51 may be increased, so that the battery can complete the temperature regulation within the target time. Wherein the larger the difference between the temperature regulation required power P1 and the temperature regulation actual power P2 is, the more the power of the heater 53 and the flow rate of the coolant of the battery circuit are increased. If the battery temperature adjustment required power P1 is less than or equal to the temperature adjustment actual power P2, the battery thermal management controller may reduce the power of the heater 53, or keep the power of the heater 53 unchanged, or reduce the flow rate of the cooling liquid in the battery circuit to reduce the heating power of the battery. When the temperature of the battery 6 is higher than a preset temperature, for example, 10 ℃, the heating of the battery 6 is completed, the battery management controller sends a message for turning off the temperature adjustment function to the battery thermal management controller through CAN communication, and the battery thermal management controller controls the heater 53 to be turned off. If the temperature of the battery 6 is still below 10 c after the thermostat system enters the heating mode for a longer period of time, such as 1 hour, the battery thermal management controller will increase the power to the heater 53 appropriately to allow the battery 6 to finish warming as soon as possible.
According to an embodiment of the present invention, the controller is further configured to decrease the rotation speed of the pump 51 or keep the rotation speed of the pump 51 constant when the temperature-adjustment required power P1 of the battery is less than or equal to the corresponding temperature-adjustment actual power P2, and increase the rotation speed of the pump 51 when the temperature-adjustment required power P1 of the battery is greater than the corresponding temperature-adjustment actual power P2.
Specifically, when the temperature regulation system enters the heating mode or the cooling mode, if the temperature regulation required power P1 of the battery 6 is smaller than the temperature regulation actual power P2, the controller controls the rotation speed of the pump 51 to be reduced to save electric power, or keeps the rotation speed of the pump 51 constant. If the temperature regulation required power P1 of the battery 6 is greater than the temperature regulation actual power P2, the controller is used for controlling the increase of the power of the heater 53 and the compressor 1 or the increase of the flow rate of the cooling liquid in the loop where the battery is located, and is also used for controlling the increase of the rotation speed of the pump 51, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, and the temperature regulation actual power P2 of the battery is increased, so as to realize temperature regulation within the target time t. On the other hand, if the temperature-adjustment required power P1 of the battery 6 is equal to the temperature-adjustment actual power P2, it is sufficient to control the rotation speed of the pump 51 to be kept constant at the current rotation speed.
To summarize, when the thermostat system is operating in the cooling mode, if the sum of the thermostat demand power P1 of the battery 6 and the in-vehicle cooling demand power P4 is less than the compressor maximum cooling power P, i.e., P1+ P4 ≦ P, the in-vehicle air-conditioning controller controls the compressor 1 to operate at the P1+ P4 cooling power. If P1+ P4 > P, the battery management controller judges whether the temperature of the battery 6 is higher than a set temperature (such as 45 ℃), if so, cooling power is preferentially provided for the battery 6, the vehicle-mounted air-conditioning controller controls the compressor 1 to operate according to the maximum cooling power, the vehicle-mounted air-conditioning controller controls the opening degrees of the first expansion valve 32 and the second expansion valve 42 so that the cooling power of the battery cooling branch 4 is equal to the battery temperature adjustment demand power P1, and the power P4 of the in-vehicle cooling branch is equal to P minus P1. And if the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, preferentially providing cooling power for the vehicle, controlling the compressor 1 to operate according to the maximum cooling power, wherein the cooling power of the cooling branch 3 in the vehicle is P4, and the cooling power of the battery cooling branch 4 is P-P4. If the vehicle interior temperature has reached the set temperature, cooling of the battery 6 is again preferentially satisfied.
When the P1 of the battery 6 is greater than the P2, and the power required to be adjusted by the battery 6 is P3(P3 is P1-P2), if P1+ P4+ P3 is equal to or less than P, the cooling power required to be increased by the compressor 1 is P3, and the P1 can be made to be P2 by increasing the opening degree of the second expansion valve 42 and/or increasing the rotation speed of the pump 51. If P1+ P4+ P3 > P, the battery management controller determines whether the battery temperature is higher than a set temperature, for example, the set temperature may be 45 ℃, and if the battery temperature is higher than 45 ℃, the cooling power is preferentially supplied to the battery 6, the vehicle air conditioning controller controls the compressor 1 to operate at the maximum cooling power, and increases the cooling power of the battery cooling branch 4 by P3 by adjusting the opening degrees of the first expansion valve 32 and the second expansion valve 42, so that P1 is equal to P2, and the cooling power of the vehicle interior cooling branch 3 is decreased. And if the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, preferentially providing cooling power for the vehicle, controlling the compressor 1 to operate according to the maximum cooling power, wherein the cooling power of the cooling branch 3 in the vehicle is P4, and the cooling power of the battery cooling branch 4 is P-P4. If the vehicle interior temperature has reached the set temperature, the cooling of the battery 6 is again preferably satisfied, and the cooling power of the battery cooling branch 4 is increased by P3.
And if P1 is less than or equal to P2, the vehicle-mounted air conditioner controller maintains the power of the compressor unchanged, or reduces the power of the compressor, or reduces the opening degree of the second expansion valve 42, or reduces the rotating speed of the pump 51, so that the cooling power of the battery cooling branch 4 is reduced.
When the temperature regulating system works in the heating mode, the power difference between P1 and P2 is P3, namely P1-P2 is P3. If P1 > P2, the battery thermal management controller controls the heating power of the heater 53 to increase P3 and increases the speed of the pump 51. If P1 ≦ P2, battery thermal management may keep heater 53 powered, or decrease heater 53 power by P3 to conserve power, or decrease the speed of pump 51.
If the temperature of the battery 6 is still higher than 35 c after the cooling function has been turned on for a predetermined time, for example, after 1 hour, the cooling power of the battery is increased. If the average battery temperature is still below 10 c after the heating function is turned on for 1 hour, the battery thermal management controller may increase the power of the heater 53 appropriately.
If a single compressor 1 cannot meet the power required for cooling the battery 6, a plurality of compressors 1 may be provided to supply cooling power to the battery 6. As on a bus there are typically 4 compressors, and these 4 compressors can now all be used to provide cooling power to the battery 6.
According to an embodiment of the present invention, the plurality of compressors 1 for supplying the refrigerant to the battery, the in-vehicle cooling branch 3 and the battery cooling branch 4 are both provided in plurality, and the controller is further configured to judge the number of compressors to be started based on the temperature regulation required power P1 of the battery and the maximum cooling power P of each compressor, and control the corresponding number of compressors 1 to be started when the temperature regulation system is in the cooling mode.
Specifically, when the compressor 1 is plural, the in-vehicle cooling branch 3 and the battery cooling branch 4 are plural, respectively. For example, when the number of the compressors 1 for supplying the refrigerant to the battery 6 is 2, and the number of the in-vehicle cooling branch 3 and the battery cooling branch 4 are 2, when the thermostat system enters the cooling mode, the controller obtains the temperature regulation required power P1 of the battery 6, and if the temperature regulation required power P1 of the battery 6 is less than or equal to the maximum cooling power of a single compressor 1, the controller controls one compressor 1 to be started. And if the temperature regulation demand power P1 of the battery 6 is greater than the maximum cooling power of the single compressor 1, the controller controls the two compressors 1 to start to operate simultaneously to meet the cooling demand power of the battery 6.
The working principle of the plurality of compressors 1 is the same as that of the single compressor 1, and the description is omitted here to avoid redundancy.
According to the temperature adjusting system of the vehicle-mounted battery, the heating power and the cooling power of the battery can be accurately controlled according to the actual state of the battery, the temperature is adjusted when the temperature of the battery is too high or too low, the temperature of the battery is maintained in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
Fig. 4 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a first embodiment of the invention. As shown in fig. 4, the temperature adjustment method of the vehicle-mounted battery includes the steps of:
and S1, acquiring the temperature regulation required power P1 of the battery.
Further, as shown in fig. 5, in the embodiment of the present invention, the acquiring the power required for the temperature adjustment of the battery specifically includes:
and S11, acquiring a first parameter when the battery opening temperature is adjusted, and generating first temperature adjustment required power according to the first parameter.
And S12, acquiring a second parameter of the battery during temperature adjustment, and generating a second temperature adjustment required power according to the second parameter.
S13, generating a temperature regulation demand power P1 according to the first temperature regulation demand power and the second temperature regulation demand power.
Further, according to an embodiment of the present invention, the first parameters are an initial temperature and a target temperature at which the battery is opened for temperature adjustment and a target time t from the initial temperature to the target temperature, and the generating the first temperature adjustment required power according to the first parameters specifically includes: a first temperature difference Delta T between an initial temperature and a target temperature is obtained1. According to the first temperature difference Delta T1And the target time t generates the first temperature regulation required power P1.
Still further, according to an embodiment of the present invention, the first temperature regulation required power is generated by the following formula (1):
ΔT1*C*M/t, (1)
wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
According to an embodiment of the present invention, the second parameter is an average current I of the battery for a preset time, and the second temperature regulation required power is generated by the following formula (2):
I2*R, (2)
wherein I is the average current and R is the internal resistance of the battery.
And S2, acquiring the temperature-regulated actual power P2 of the battery.
According to an embodiment of the present invention, as shown in fig. 5, the obtaining of the temperature-adjusted actual power of the battery specifically includes:
s21, the inlet temperature and the outlet temperature of the flow path for adjusting the battery temperature are acquired, and the flow velocity v of the coolant flowing into the flow path is acquired.
S22, generating a second temperature difference Delta T according to the inlet temperature and the outlet temperature2
S23, according to the second temperature difference Delta T2And the flow rate v generates a temperature regulated actual power P2.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is further generated according to the following formula (3):
ΔT2*C*m, (3)
wherein, Delta T2And C is the specific heat capacity of the battery, and m is the mass of the cooling liquid flowing through the cross section of the flow path per unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
The flow velocity sensor may be replaced with a flow sensor, where m is Q ρ, and Q is a flow rate of the coolant flowing through the cross-sectional area of the flow path per unit time measured by the flow sensor.
And S3, adjusting the temperature of the battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2.
In the embodiment of the invention, the temperature of the battery is adjusted within the target time according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 to reach the target temperature.
Specifically, after the vehicle is powered on, whether the battery needs to be subjected to temperature adjustment is judged, if so, the initial temperature (namely the current temperature) of the battery, the target temperature and the target time t from the initial temperature to the target temperature are obtained, wherein the target temperature and the target time t can be preset according to the actual condition of the vehicle-mounted battery, and then the first temperature adjustment required power is calculated according to the formula (1). Meanwhile, the average current I of the battery in the preset time is obtained, and the second temperature regulation required power is calculated according to the formula (2). Then, the temperature regulation required power P1 (required power that regulates the temperature of the battery to the target temperature) is calculated from the first temperature regulation required power and the second temperature regulation required power. Then, the inlet temperature and the outlet temperature of the battery are obtained, the flow rate information is obtained, and the temperature adjustment actual power P2 is calculated according to the formula (3). Finally, the compressor or the heater is controlled to operate at different powers according to the temperature-adjustment required power P1 and the temperature-adjustment actual power P2. Therefore, the control method can accurately control the time required by the temperature adjustment of the battery, the actual power of the temperature adjustment of the battery can be adjusted in real time, the temperature adjustment of the vehicle-mounted battery can be completed within the target time, the temperature of the vehicle-mounted battery is maintained within the preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
According to an embodiment of the present invention, as shown in fig. 6, the temperature adjustment method of the vehicle-mounted battery may further include: the temperature of the battery is detected, and it is determined whether the temperature is greater than the first temperature threshold or less than the second temperature threshold (S10-S20). When the temperature of the battery is greater than the first temperature threshold, the cooling mode is entered (S30). The first preset temperature threshold may be preset according to actual conditions, and may be, for example, 40 ℃. When the temperature of the battery is less than or equal to the first temperature threshold, whether the temperature of the battery is less than a second temperature threshold is further judged, and when the temperature of the battery is less than the second temperature threshold, a heating mode is entered (S40-S50). The second preset temperature threshold may be preset according to an actual situation, and may be 0 ℃.
Specifically, after the vehicle is powered on, the temperature of the battery is detected in real time and is judged. If the temperature of the battery is higher than 40 ℃, the temperature of the battery is over high at the moment, and in order to avoid the influence of the high temperature on the performance of the battery, the battery needs to be cooled, a cooling mode is entered, and the compressor is controlled to start, so that the cooling liquid and the battery exchange heat to reduce the temperature of the battery. And if the temperature of the battery is lower than 0 ℃, the temperature of the battery is too low at the moment, and in order to avoid the influence of low temperature on the performance of the battery, the battery needs to be subjected to temperature rise treatment, and then the battery enters a heating mode, and the heater is controlled to be started to provide heating power. It can be understood that the battery 6 is temperature-regulated according to the battery temperature regulation required power P1 and the temperature regulation actual power P2, the time required for the battery temperature regulation can be precisely controlled, and P2 is adjustable in real time, so that the battery temperature regulation can be ensured to be completed within the target time t. Also, the temperature regulation required power P1 and the temperature regulation actual power P2 are easily obtained.
From the above embodiment, it can be seen that P1 is composed of two parts, taking cooling battery as an example, when the battery needs to be cooled, the initial temperature of the battery is 45 ℃, the cooling target temperature of the battery is 35 ℃, and the heat quantity to be dissipated when the battery is lowered from 45 ℃ to 35 ℃ is fixed, and is expressed by the formula (1) as Δ T1Direct calculation of C M/t can be obtained. Wherein, Delta T1Is a first temperature difference between the initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery. Meanwhile, during the cooling process of the battery, a discharging process and a charging process exist, heat is generated in the discharging process and the charging process, and the heat of the part can also be directly obtained by detecting current through a formula (2), namely I2And R, directly calculating the heating power of the current battery, namely the second temperature regulation required power. Wherein I is the average current and R is the internal resistance of the battery. One of the key points of the invention is that the cooling time is adjustable, and the cooling completion time can be accurately determined, and the invention is set based on the target time t (t can be set according to the requirements of users or according to the requirements of usersIs a change in the actual design of the vehicle). After the target time T required for cooling completion is determined, the temperature adjustment required power P1, P1 ═ Δ T, required for cooling the battery at present can be estimated 1*C*M/t+I2R. If the heating function is started, the temperature regulation required power P1 is delta T1*C*M/t-I2R, i.e. the greater the battery discharge or charge current during the heating of the battery, the smaller the required heating power, i.e. the temperature regulation demand power P1.
Since the discharge or charge current of the battery is varied, I2R is variable, so that to better ensure the accuracy of the cooling time, the cooling power is also varied as the current average discharge or charge current of the battery is varied. If the vehicle-mounted air conditioner cools the battery and the vehicle compartment at the same time, when the discharge current of the battery is small, I2R will decrease and at this point the vehicle air conditioner can distribute more cooling power to the cabin, allowing the cabin to reach the set air temperature faster. Meanwhile, when the discharge or charge current of the battery is large, I2R will be larger and the on-board air conditioner can distribute more cooling power to the battery. Through the adjustment, the time required by cooling the battery is always accurate, and meanwhile, the refrigerating power of the vehicle-mounted air conditioner can be more efficiently and reasonably utilized, so that the air conditioner with higher cooling power is not required to be configured, and the waste of the refrigerating power is caused.
Since the battery cooling time is affected by the cooling efficiency, since the cooling efficiency is affected by the external environment temperature and the current temperature of the battery, and the efficiency of the temperature regulation system is constantly changed during the battery cooling process, the cooling efficiency cannot be 100%, and therefore, the time required for the battery cooling cannot be accurately regulated only according to the temperature regulation demand power P1, and it is necessary to detect the temperature regulation actual power P2 of the battery. In the present invention, the battery temperature regulation actual power P2 can be calculated by the formula (3), i.e., Δ T2 × C ×.m. P2 can also be calculated from the actual battery cooling power P2, i.e. from the equation (4) Δ T3 × C × m1, where Δ T3 is the temperature change of the battery over a certain period of time, C is the specific heat capacity of the battery, and m1 is the battery mass. However, since the mass of the battery is large, the temperature change in the unit time is not significant, and it takes a long time to detect the temperature difference, and the real-time requirement is not met, the temperature-regulated actual power P2 is generally calculated according to the formula (3).
Due to the influence of the cooling efficiency, the temperature adjustment actual power P2 is difficult to be completely equal to the temperature adjustment required power P1, and in order to make the battery cooling target time t more accurate, the battery cooling target time t needs to be adjusted in real time according to the power difference between the temperature adjustment required power P1 and the temperature adjustment actual power P2, so as to ensure that the temperature adjustment required power P1 of the battery is equal to the temperature adjustment actual power P2 of the battery.
How the temperature of the battery is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 will be described below with reference to specific embodiments.
According to an embodiment of the present invention, when the current operation mode is the cooling mode, as shown in fig. 7, the adjusting the temperature of the battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 specifically includes:
s31, whether the temperature regulation demand power P1 is larger than the temperature regulation actual power P2 is judged.
S32, if the temperature regulation required power P1 is greater than the temperature regulation actual power P2, a power difference between the temperature regulation required power P1 and the temperature regulation actual power P2 is acquired, and the power of the compressor for cooling the battery is increased according to the power difference.
And S33, if the temperature regulation required power is less than or equal to the temperature regulation actual power, reducing the power of the compressor or keeping the power of the compressor unchanged.
Specifically, when the cooling mode is entered, the power of the compressor 1 is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2. If the temperature-regulation required power P1 is greater than the temperature-regulation actual power P2, it means that the temperature of the battery cannot be lowered to the target temperature within the target time t if the compressor is operated at the current power. Therefore, the power difference between the temperature regulation required power P1 and the temperature regulation actual power P2 is continuously obtained, and the power of the compressor is increased according to the power difference, and the larger the power difference between the temperature regulation required power P1 and the temperature regulation actual power P2 is, the more the power of the compressor is increased, so that the temperature of the battery is reduced to the target temperature within the preset time. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the power of the compressor can be kept unchanged or reduced appropriately. And when the temperature of the battery is lower than 35 ℃, the battery is cooled, and the information for closing the temperature regulation function is sent to the vehicle-mounted air conditioner through CAN communication. If the battery temperature is still above 35 c after a long time, for example 1 hour, after entering the cooling mode, the compressor power is increased appropriately to complete the cooling of the battery as soon as possible.
According to an embodiment of the present invention, as shown in fig. 7, when the current operation mode is the heating mode, the adjusting the temperature of the battery according to the temperature adjustment required power and the temperature adjustment actual power specifically includes:
s34, it is determined whether the temperature adjustment required power P1 is greater than the temperature adjustment actual power P2.
S35, if the temperature regulation required power P1 is greater than the temperature regulation actual power P2, a power difference between the temperature regulation required power P1 and the temperature regulation actual power P2 is acquired, and the power of the heater for heating the battery is increased according to the power difference.
S36, if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the power of the heater is kept unchanged.
Specifically, when entering the heating mode, the heater is turned on, and the power of the heater is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2. If the temperature-adjustment required power P1 is greater than the temperature-adjustment actual power P2, it means that the temperature of the battery cannot be raised to the target temperature within the preset time if the heater is heated at the current power. Therefore, the power difference between the temperature adjustment required power P1 and the temperature adjustment actual power P2 is continuously obtained, and the power of the heater is increased according to the power difference, wherein the larger the difference between the temperature adjustment required power P1 and the temperature adjustment actual power P2 is, the more the power of the heater is increased. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the power of the heater can be kept constant. When the temperature of the battery is higher than the preset temperature, for example, 10 ℃, the battery heating is completed, and the battery management controller sends a message for turning off the temperature regulation function to the battery thermal management controller through the CAN communication and controls the heater to be turned off. If the battery temperature is still below 10 c after entering the heating mode for a longer period of time, for example, 1 hour, the heater power is increased appropriately to allow the battery to finish warming as soon as possible.
According to an embodiment of the present invention, as shown in fig. 8, the temperature adjustment method of the vehicle-mounted battery may further include:
s37, if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the rotation speed of the pump is reduced or kept unchanged.
S38, if the temperature regulation demand power P1 is greater than the temperature regulation actual power P2, the rotational speed of the pump is increased.
Specifically, when entering the heating mode or the cooling mode, if the temperature-regulation required power P1 is less than or equal to the temperature-regulation actual power P2, the rotation speed of the pump is controlled to be reduced to save electric power or to keep the rotation speed of the pump constant. And if the temperature regulation required power P1 is greater than the temperature regulation actual power P2, the rotation speed of the pump is controlled to be increased in addition to the power increase of the heater or the compressor, so that the mass of the coolant flowing through the cross section of the cooling flow path per unit time can be increased, thereby increasing the temperature regulation actual power P2 to achieve the temperature regulation of the battery within the target time.
According to an embodiment of the present invention, when there are a plurality of compressors for supplying the refrigerant to the battery, the method may further include: the number of compressors to be started is judged according to the temperature regulation demand power P1 and the maximum cooling power of each compressor. When the cooling mode is adopted, a corresponding number of compressors are controlled to start.
Further, the determining the number of started compressors according to the temperature regulation demand power P1 and the maximum cooling power of each compressor specifically includes: it is judged whether the temperature regulation demand power P1 of the battery is larger than the maximum cooling power of the single compressor. And if the maximum refrigerating power is larger than that of the single compressor, controlling the multiple compressors to start simultaneously.
For example, when 2 compressors 1 for supplying refrigerant to the battery are provided, the number of compressors to be started is determined according to the temperature regulation demand power P1 and the maximum cooling power of each compressor when entering the cooling mode, and if the temperature regulation demand power P1 is less than or equal to the maximum cooling power of a single compressor, one compressor may be controlled to be started. And if the temperature adjustment required power P1 is larger than the maximum refrigerating power of a single compressor, controlling the two compressors to start to work simultaneously so as to meet the cooling refrigerating power requirement of the battery.
It should be noted that, in the embodiment of the present invention, the battery may be a single battery pack (composed of a plurality of battery cells), or may be composed of a plurality of battery packs connected in series, in parallel, or in series-parallel. When the battery includes a plurality of battery packs connected in parallel, temperature-regulated power distribution is required between the respective battery packs, which requires power distribution through valves.
To summarize, when the thermostat system is operating in the cooling mode, if the sum of the battery thermostat demand power P1 and the in-vehicle cooling demand power P4 is less than the maximum cooling power P of the compressor, i.e., P1+ P4 ≦ P5, the compressor is controlled to operate at the cooling power P1+ P4. If P1+ P4 is greater than P, whether the temperature of the battery is greater than the set temperature (such as 45 ℃) or not is judged, if the temperature of the battery is greater than 45 ℃, cooling power is preferentially provided for the battery, the compressor is controlled to operate according to the maximum refrigerating power, the cooling power of the battery cooling branch is made to be equal to the battery temperature regulation required power P1 by controlling the flow of the cooling mediums of the battery cooling branch and the in-vehicle cooling branch, and the power P4 of the in-vehicle cooling branch is equal to P minus P1. And if the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, preferentially providing cooling power for the vehicle, controlling the compressor to operate according to the maximum cooling power, wherein the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is P-P4. And if the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, preferentially providing cooling power for the vehicle, and controlling the compressor 1 to operate according to the maximum cooling power, wherein the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is P-P4. If the temperature in the vehicle reaches the set temperature, the cooling of the battery is preferably satisfied.
When the battery P1 is greater than P2, the power required to be regulated by the battery is P3(P3 is P1-P2), if P1+ P4+ P3 is less than or equal to P5, the refrigerating power required to be increased by the compressor 1 is P3, and the P1 can be made to be P2 by increasing the refrigerant flow rate of the battery cooling branch and/or increasing the rotation speed of the pump. And if P1+ P4+ P3 is greater than P, the battery management controller determines whether the battery temperature is greater than a set temperature, for example, the set temperature may be 45 ℃, and if the battery temperature is greater than 45 ℃, cooling power is preferentially provided for the battery, the compressor is controlled to operate according to the maximum cooling power, so that the cooling power of the battery cooling branch is increased, and the cooling power of the in-vehicle cooling branch is decreased. And if the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, preferentially providing cooling power for the vehicle, controlling the compressor to operate according to the maximum cooling power, wherein the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is P-P4. If the temperature in the vehicle has reached the set temperature, the cooling of the battery is preferentially satisfied, and the cooling power of the battery cooling branch is increased by P3.
And if the P1 is less than or equal to P2, the power of the compressor is maintained unchanged, or the power of the compressor is reduced, or the flow rate of a refrigerant for cooling the battery is reduced, or the rotating speed of the pump is reduced, so that the cooling power of the battery cooling branch is reduced.
When the temperature regulating system works in the heating mode, the power difference between P1 and P2 is P3, namely P1-P2 is P3. If P1 > P2, the heating power of the heater is controlled to be increased by P3, and the pump speed is increased. If P1 is less than or equal to P2, the power of the heater can be kept unchanged, or the power of the heater can be reduced by P3 to save electric energy or reduce the rotation speed of the pump.
If the temperature of the battery is still above 35 c after the cooling function has been turned on for a predetermined time, for example, after 1 hour, the battery cooling power requirement is increased. If the average battery temperature is still below 10 c after the heating function is turned on for 1 hour, the battery thermal management controller may increase the heater power appropriately.
According to the temperature adjusting method of the vehicle-mounted battery, the required power for adjusting the temperature of the battery is firstly obtained, the actual power for adjusting the temperature of the battery is then obtained, and finally the temperature of the battery is adjusted at the target time according to the required power for adjusting the temperature and the actual power for adjusting the temperature so as to achieve the target temperature. Therefore, the method can accurately control the temperature adjusting time of the battery, the actual temperature adjusting power of the battery can be adjusted in real time, the heating power and the cooling power of the vehicle-mounted battery can be accurately controlled according to the actual state of the vehicle-mounted battery within the target time, the temperature can be adjusted when the temperature of the vehicle-mounted battery is too high or too low, the temperature of the vehicle-mounted battery is maintained within the preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
Furthermore, the present invention also proposes a non-transitory computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the above-described temperature adjustment method for an in-vehicle battery.
According to the non-transitory computer-readable storage medium of the embodiment of the invention, the required power for temperature adjustment of the battery is firstly obtained, then the actual power for temperature adjustment of the battery is obtained, and finally the temperature of the battery is adjusted according to the required power for temperature adjustment and the actual power for temperature adjustment, so that the temperature can be adjusted when the temperature of the vehicle-mounted battery is too high or too low, the temperature of the vehicle-mounted battery is maintained in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
Whereas, when the number of the batteries 6 of the vehicle is plural and the plural batteries 6 are connected in parallel, for example, the number of the batteries 6 is 2, respectively, the first battery 61 and the second battery 62, as shown in fig. 9, the temperature regulation system of the vehicle-mounted battery includes: compressor 1, condenser 2, battery cooling branch 4 and battery temperature regulation module 5.
Wherein the condenser 2 is connected to the compressor 1 and the battery cooling branch 4 is connected between the compressor 1 and the condenser 2. The battery temperature adjusting module 5 is connected with the plurality of batteries 6 connected in parallel and the battery cooling branch 4, obtains temperature adjusting required power P1 and temperature adjusting actual power P2 of the plurality of batteries connected in parallel, and adjusts the temperature of the plurality of batteries connected in parallel according to the temperature adjusting required power P1 and the temperature adjusting actual power P2 of the plurality of batteries connected in parallel.
Further, according to an embodiment of the present invention, adjusting the temperature of the plurality of parallel batteries according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the plurality of parallel batteries respectively includes: the temperature of the plurality of parallel batteries is adjusted within the target time t according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the plurality of parallel batteries, respectively, to reach the target temperature.
That is, the battery temperature adjusting module 5 can ensure that the heating power and the cooling power of the vehicle-mounted battery are accurately controlled according to the actual state of each battery 6 within the target time t when each battery 6 is temperature-adjusted according to the P1 and P2 of each battery, thereby adjusting the temperature when the vehicle-mounted battery temperature is excessively high or excessively low.
When the temperature in the vehicle is too high, the cooling function in the vehicle is started, and the flowing direction of the cooling liquid is as follows: compressor 1-condenser 2-in-vehicle cooling branch 3-compressor 1. When the temperature of the first battery 61 is too high, the battery cooling function is started, and the flow directions of the cooling liquid in the first pipe and the second pipe are as follows: compressor 1-condenser 2-battery cooling branch 4-compressor 1; battery cooling branch 4-battery temperature regulation module 5-first battery 61-battery temperature regulation module 5-battery cooling return branch 4. When the temperature of the second battery 62 is too high, the flow directions of the cooling liquid in the first duct and the second duct are: compressor 1-condenser 2-battery cooling branch 4-compressor 1; battery cooling circuit branch 4-battery temperature regulation module 5-second battery 62-battery temperature regulation module 5-battery cooling branch 4.
The refrigerating power of the battery temperature adjusting module 5 is provided by the vehicle-mounted air conditioner and shares the refrigerating capacity with the refrigerating system in the vehicle, so that the size of the temperature adjusting system can be reduced, and the distribution of the flow of the cooling liquid is more flexible. Therefore, the heating power and the cooling power of each battery can be accurately controlled according to the actual state of each battery, so that the temperature of the vehicle-mounted battery is adjusted when the temperature of the vehicle-mounted battery is too high or too low, the temperature of the vehicle-mounted battery is maintained in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
Further, according to an embodiment of the present invention, as shown in fig. 4 and 5, the battery cooling branch 4 may include a heat exchanger 41, and the heat exchanger 41 includes a first pipe and a second pipe, the second pipe is connected to the battery temperature adjusting module 5, the first pipe is communicated with the compressor 1, wherein the first pipe and the second pipe are independently disposed adjacent to each other.
The battery temperature adjustment module 5 may include: a flow path (not specifically shown) that regulates the temperature of the battery is provided in the battery 6. A pump 51, a medium container 52, a heater 53, and a controller (not specifically shown in the drawings) connected between the flow path and the heat exchanger 41. The controller respectively obtains the temperature regulation required power P1 of the batteries 6 connected in parallel and the temperature regulation actual power P2 of the batteries, and regulates the temperature of each battery 6 according to the temperature regulation required power P1 and the temperature regulation actual power P2 of each battery. The in-vehicle cooling branch 3 may include: an evaporator 31, a first expansion valve 32, and a first electronic valve 33. The battery cooling branch 4 may further include a second expansion valve 42 and a second electronic valve 43.
It is understood that the heat exchanger 41 may not be provided in the battery cooling branch 4, and when the heat exchanger 41 is not provided, a cooling medium flows in the battery cooling branch 4. If the heat exchanger 41 is arranged, a refrigerant flows in the first pipeline in the battery cooling branch circuit 4, a cooling liquid flows in the second pipeline, and the refrigerant flows in the in-vehicle cooling loop.
According to an embodiment of the present invention, as shown in fig. 9, the cell temperature adjusting module 5 further includes a first temperature sensor 55 provided at an inlet of the flow path, a second temperature sensor 56 provided at an outlet of the flow path, and a flow rate sensor 57. It will be appreciated that the inlet and outlet positions of the flow path are not absolute, but rather are determined by the direction of rotation of the pump 51.
Specifically, the controller may include a battery management controller, a battery thermal management controller, and an on-board air conditioning controller. The battery thermal management controller can be electrically connected with the pump 51, the first temperature sensor 55, the second temperature sensor 56 and the flow rate sensor 57, and obtains the temperature regulation actual power P2 of the plurality of parallel batteries and controls the rotating speed of the pump 51 according to the specific heat capacity of the medium and the density of the medium. The battery management controller collects current flowing through the battery and the temperature of the battery, obtains temperature regulation required power P1 according to the target temperature and the target time t of the battery, the specific heat capacity C of the battery, the mass M of the battery and the internal resistance R of the battery, and controls the vehicle-mounted air conditioner controller to start or stop working. The vehicle-mounted air conditioner controller is electrically connected with the compressor 1, the expansion valve and the electronic valve so as to control the power P of the compressor, the expansion valve and the electronic valve to be opened and closed according to the temperature regulation required power P1 obtained by the battery management controller and the temperature regulation actual power P2 obtained by the battery thermal management controller, and the purpose of controlling the heat exchange amount is achieved.
The heat exchanger 41 can be a plate heat exchanger, and the plate heat exchanger can be installed inside the vehicle-mounted air conditioner, so that the whole refrigerant loop is inside the vehicle-mounted air conditioner, the vehicle-mounted air conditioner is convenient to factory debug, the vehicle-mounted air conditioner can supply and assemble independently, and meanwhile, the vehicle-mounted air conditioner only needs to be filled with refrigerant once in the installation process.
The coolant flows into the battery 6 from the inlet of the flow path and flows out from the outlet of the flow path, thereby achieving heat exchange between the battery 6 and the coolant.
The pump 51 is primarily used to provide power, and the media container 52 is primarily used to store and receive coolant to the temperature regulation system, and the coolant in the media container 52 can be automatically replenished when the coolant in the temperature regulation system is reduced. The heater 53 may be a PTC (Positive Temperature Coefficient, broadly referred to as a semiconductor material or a component having a large Positive Temperature Coefficient) heater, and may communicate with a Controller Area Network (CAN) to provide heating power for a Temperature adjustment system of the vehicle-mounted battery and be controlled by the Controller. That is, the heater 53 is not in direct contact with the battery 6, and has high safety, reliability, and practicality.
The first temperature sensor 55 is used to detect the temperature of the cooling fluid at the inlet of the flow path, and the second temperature sensor 56 is used to detect the temperature of the cooling fluid at the outlet of the flow path. Flow rate sensor 57 is used to detect information on the flow rate of cooling fluid in the pipe in the temperature regulation system. The first electronic valve 33 is used for controlling the opening and closing of the in-vehicle cooling branch 3, and the first expansion valve 32 is used for controlling the flow rate of the cooling liquid in the in-vehicle cooling branch 3. The second electronic valve 43 is used for controlling the opening and closing of the battery cooling branch 4, and the second expansion valve 42 can be used for controlling the flow of the cooling liquid in the battery cooling branch 4. A valve 58 is also provided at the inlet of the flow path of each cell 6. The controller can control the flow rate of the cooling liquid flowing into each battery 6 through the control valve 58 according to the P1 and the P2 corresponding to each battery 6, respectively, so that the heating power/cooling power of each battery 6 can be accurately controlled. According to an embodiment of the present invention, the controller is further configured to generate a total temperature adjustment required power Pz according to the temperature adjustment required power P1 of the plurality of parallel batteries, and determine whether the total temperature adjustment required power Pz matches the maximum cooling power P of the vehicle air conditioner, wherein if matching, the controller cools the plurality of parallel batteries 6 according to the temperature adjustment required power P1 of the plurality of parallel batteries. If not, the controller adjusts the required power P1 to cool the plurality of parallel batteries 6 according to the maximum cooling power P of the air conditioner and the temperatures of the plurality of parallel batteries.
Specifically, as shown in fig. 9, the controller may calculate the total temperature adjustment required power Pz of the entire temperature adjustment system according to the temperature adjustment required power P1 of each battery, that is, add the temperature adjustment required power P1 of each battery to obtain the total temperature adjustment required power Pz. And then judging whether Pz matches the maximum cooling power P of the vehicle-mounted air conditioner according to the total temperature adjustment required power Pz, namely judging whether Pz is less than or equal to P, if so, the controller cools each battery by controlling the valve 58 or controlling the power of the compressor 1 according to the temperature adjustment required power P1 of each battery. And if PZNot matched with the maximum refrigerating power P of the vehicle-mounted air conditioner, namely Pz is larger than P, the controller is used for controlling the air conditioner to work according to the sum of the maximum refrigerating power P of the air conditioner and the maximum refrigerating power P of the air conditionerThe temperature of each battery adjusts the required power P1, and the coolant flow is proportionally distributed by adjusting the opening degree of the valve 58, so that the temperature of each battery 6 can be reduced with the maximum efficiency.
How the battery temperature adjustment module 5 obtains the temperature-adjustment required power P1 and the temperature-adjustment actual power P2 of each battery 6 is described below with reference to specific embodiments.
According to an embodiment of the present invention, the controller may be configured to respectively obtain a first parameter at the time of turning on the temperature adjustment of each battery, and generate a first temperature adjustment required power of each battery according to the first parameter, and respectively obtain a second parameter at the time of temperature adjustment of each battery, and generate a second temperature adjustment required power of each battery according to the second parameter, and generate a temperature adjustment required power P1 of each battery according to the first temperature adjustment required power of each battery and the second temperature adjustment required power of each battery.
Further, according to an embodiment of the present invention, the first parameter is an initial temperature and a target temperature at which the temperature adjustment of the battery 6 is turned on and a target time T from the initial temperature to the target temperature, and the controller acquires a first temperature difference Δ T between the initial temperature and the target temperature1And according to the first temperature difference DeltaT1And the target time t generates the first temperature regulation required power.
Further, the controller generates the first temperature regulation required power by the following formula (1):
ΔT1*C*M/t (1),
wherein, Delta T1Is a first temperature difference between the initial temperature and the target temperature, t is the target time, C is the specific heat capacity of the battery 6, and M is the mass of the battery 6.
The second parameter is an average current I of each battery 6 for a preset time, and the controller generates a second temperature regulation required power by the following formula (2):
I2*R, (2),
where I is the average current and R is the internal resistance of the battery 6.
When cooling battery 6, P1 ═ Δ T1*C*M/t+I2R; when the battery 6 is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to one embodiment of the present invention, the controller generates the second temperature difference Δ T according to the inlet temperature detected by the first temperature sensor 55 and the outlet temperature detected by the second temperature sensor 56, respectively2And according to the second temperature difference DeltaT of each battery 2And the flow rate v detected by the flow rate sensor 57 generates the temperature-adjusted actual power P2 for each cell.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
Specifically, after the vehicle is powered on, the battery management controller determines whether the vehicle needs to be temperature-regulated, and if it is determined that the vehicle needs to be temperature-regulated, for example, the temperature of the battery 6 is too high, the vehicle-mounted air conditioner controller sends information for turning on the temperature regulation function to the vehicle-mounted air conditioner through CAN communication, and after the vehicle-mounted air conditioner controller turns on the temperature regulation function, the vehicle-mounted air conditioner controller sends heat exchange information to the battery thermal management controller, and at the same time, the vehicle-mounted controller controls the second electronic valve 43 to be turned on, and the battery thermal management controller controls the pump 51 to start to operate.
Meanwhile, the battery management controller obtains an initial temperature (i.e., a current temperature), a target temperature, and a target time t from the initial temperature to the target temperature of each battery 6, where the target temperature and the target time t may be preset according to an actual situation, and calculates a first temperature adjustment required power of each battery according to formula (1). Meanwhile, the battery management controller also respectively obtains the average current I of the batteries 6 in the preset time, and calculates the second temperature regulation required power of each battery according to the formula (2). Then, the battery management controller adjusts the required power in accordance with the first temperature of each battery 6 And a second temperature regulation required power calculation temperature regulation required power P1 (required power that is the temperature of the battery 6 adjusted to the target temperature within the target time), wherein, when the battery 6 is cooled, P1 ═ Δ T1*C*M/t+I2R, when the battery 6 is heated, P1 ═ Δ T1*C*M/t-I2*R。
The battery thermal management controller acquires temperature information detected by the first temperature sensor 55 and the second temperature sensor 56 provided corresponding to each battery, acquires flow rate information detected by the flow rate sensor 57, and calculates the temperature-adjusted actual power P2 of each battery 6 according to the formula (3).
Finally, the vehicle-mounted air conditioner controller controls the flow of the coolant flowing into each battery 6 through the control valve 58 according to the temperature regulation required power P1 and the temperature regulation actual power P2 corresponding to each battery 6, respectively, so that the heating power/cooling power of each battery 6 can be accurately controlled. For example, if the temperature-adjustment required power P1 of the first battery 61 is greater than the temperature-adjustment required power P1 of the second battery 62, the controller may control to increase the opening degree of the valve 58 of the circuit in which the first battery 61 is located and decrease the opening degree of the valve 58 of the circuit in which the second battery 62 is located.
And if the temperature of the battery 6 is low, the vehicle-mounted air conditioning controller controls the second electronic valve 43 to be closed, the battery thermal management controller controls the heater 53 to be started, and the battery thermal management controller controls the heating power of the heater 53 according to the temperature regulation required power P1 and the temperature regulation actual power P2 so as to increase the temperature of the battery 6 to the target temperature within the target time t and prevent the working performance of the battery 6 from being influenced by overhigh temperature. Thus, it is possible to ensure that the heating power and the cooling power of each battery are accurately controlled in accordance with the actual state of each battery within the target time, thereby adjusting the temperature when the temperature of the vehicle-mounted battery is too high or too low.
Specifically, as can be seen from the above-described embodiment, the temperature regulation required power P1 is composed of two parts, and taking the first battery 61 as an example, when the first battery 61 needs to be cooled, the initial temperature of the first battery 61 is 45 ℃, the target temperature is 35 ℃, and the battery needs to be cooled down from 45 ℃ to 35 ℃ and needs to be cooled downThe heat of the hair is fixed by the formula (1) or delta T1Direct calculation of C M/t can be obtained. Meanwhile, during the cooling process of the first battery 61, there are discharging and charging processes, which generate heat, and the heat of the part can be directly obtained by detecting the average current I of the first battery, which is expressed by formula (2), i.e. I2R, the current heating power of the first battery 61, i.e., the second temperature adjustment required power is directly calculated. The cooling completion time of the present invention is set based on the target time t (t may be changed according to the user's needs or the actual design condition of the vehicle). After the target time T required for cooling completion is determined, the temperature adjustment required power P1, P1 Δ T required for cooling of the first battery 61 at present can be estimated1*C*M/t+I2R. If the heating function is started, the temperature regulation required power P1 is delta T1*C*M/t-I2R, i.e., the greater the discharge or charge current of the first battery 61 during the heating of the first battery 61, the smaller the required heating power, i.e., the temperature regulation demand power P1.
Since the discharge or charge current of the electric first battery 61 is varied, I2R is variable, so that to better ensure the accuracy of the cooling time, the cooling power is also varied as the current average discharge or charging current of the first battery 61 is varied. If the in-vehicle air conditioner cools the first battery 61 and the vehicle compartment at the same time, when the discharge current of the first battery 61 is small, I2R will decrease and more cooling power can be allocated to the cabin at this time, allowing the cabin to reach the set air temperature faster. Meanwhile, when the discharge or charge current of the first battery 61 is large, I2R will be larger and the on-board air conditioner can distribute more cooling power to the first battery 61. Through the adjustment, the time required by cooling the battery is always accurate, and meanwhile, the refrigerating power of the vehicle-mounted air conditioner can be more efficiently and reasonably utilized, so that the vehicle-mounted air conditioner with larger cooling power is not required to be configured, and the waste of the refrigerating power is caused.
The battery cooling time is affected by the cooling efficiency, and since the cooling efficiency is affected by the external environment temperature and the current temperature of the battery, the efficiency of the temperature adjustment system is also constantly changing during the cooling of the first battery 61, so the cooling efficiency cannot be 100%, and therefore it is necessary to adjust the actual power P2 based on the fact that P1 is the time at which the cooling of the first battery 61 cannot be accurately adjusted, and to detect the temperature of the first battery 61. In the present invention, the temperature-regulated actual power P2 of the first battery 62 can be calculated by the formula (3), i.e., Δ T2 × c ×.m. P2 can also be calculated from the actual battery cooling power, i.e. from the equation (4) Δ T3 × C × m1, where Δ T3 is the temperature change of the first battery 61 in a certain period of time, C is the specific heat capacity of the first battery 61, and m1 is the mass of the first battery 61. However, since the mass of the battery is generally large, the temperature change per unit time is not significant, and it takes a long time to detect the temperature difference, and therefore the temperature-regulated actual power P2 is generally calculated according to the formula (3).
When the temperature of the second battery 62 needs to be adjusted, the required temperature adjustment power P1 and the actual temperature adjustment power P2 are obtained in the same manner as the principle of the first battery 61, and are not described again here.
Due to the influence of the cooling efficiency, the temperature adjustment actual power P2 is hardly completely equal to the temperature adjustment required power P1, and in order to make the cooling target time t of each battery 6 more accurate, it is necessary to perform adjustment in real time according to the power difference between the temperature adjustment required power P1 and the temperature adjustment actual power P2 to ensure that the temperature adjustment required power P1 of the battery 6 is equal to the temperature adjustment actual power P2 of the battery.
How the temperature of each battery 6 is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of each battery 6 will be described below with reference to specific embodiments.
According to an embodiment of the present invention, the controller is further configured to detect a temperature of the plurality of parallel batteries, and control the temperature adjustment system to enter the cooling mode when the temperature of at least one of the plurality of parallel batteries 6 is greater than a first temperature threshold, and control the temperature adjustment system to enter the heating mode when the temperature of at least one of the plurality of parallel batteries 6 is less than a second temperature threshold. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the battery management controller detects the temperature of each battery 6 in real time and makes a judgment. If the temperature of one of the batteries 6 is higher than 40 ℃, which indicates that the temperature of the battery 6 is too high at this time, in order to avoid the high temperature from affecting the performance of the battery 6, the temperature of the battery 6 needs to be reduced, the battery management controller controls the temperature adjustment system to enter a cooling mode and sends a battery cooling function starting message to the vehicle-mounted air conditioning controller, and the vehicle-mounted air conditioning controller controls the second electronic valve 43 to open after receiving the battery cooling function starting message, so that the cooling liquid exchanges heat with the battery 6 to reduce the temperature of the battery 6. As shown in fig. 9, when the temperature adjustment system operates in the cooling mode, the flow directions of the cooling liquid in the corresponding first and second pipes in the loop in which the first battery 61 is located are: compressor 1-condenser 2-second electronic valve 43-second expansion valve 42-heat exchanger 41-compressor 1; the medium container 52, the heat exchanger 41, the heater 53 (closed), the pump 51, the valve 58, the first temperature sensor 55, the first battery 61, the second temperature sensor 56, the flow rate sensor 57 and the medium container 52 are circulated, heat exchange is carried out at the heat exchanger 41, and the temperature reduction of the first battery 61 is realized. The flow directions of the cooling liquid in the first pipe and the second pipe in the loop in which the second battery 62 is located are respectively: compressor 1-condenser 2-second electronic valve 43-second expansion valve 42-heat exchanger 41-compressor 1; the medium container 52, the heat exchanger 41, the heater 53 (closed), the pump 51, the valve 58, the first temperature sensor 55, the second battery 62, the second temperature sensor 56, the flow rate sensor 57 and the medium container 52 are circulated, heat exchange is carried out at the heat exchanger 41, and the temperature reduction of the second battery 62 is realized.
If the temperature of a certain battery 6 is lower than 0 ℃, which indicates that the temperature of the battery 6 is too low at this time, in order to avoid the influence of low temperature on the performance of the battery 6, the temperature of the battery 6 needs to be raised, and the battery management controller controls the temperature adjustment system to enter a heating mode and sends a battery heating function starting message to the vehicle-mounted air conditioner controller. The on-board air conditioning controller controls the second electronic valve 43 to be closed after receiving the battery heating function start information, and the battery thermal management controller controls the heater 53 to be opened to provide heating power for the temperature regulation system. When the temperature adjusting system operates in the heating mode, the flow directions of the cooling liquid in the first battery 61 and the second battery 62 are: medium container 52-heat exchanger 41-heater 53 (on) -pump 51-valve 58-first temperature sensor 55-first battery 61-second temperature sensor 56-flow rate sensor 57-medium container 52; the medium container 52, the heat exchanger 41, the heater 53 (on), the pump 51, the first temperature sensor 55, the second battery 62, the second temperature sensor 56, the flow rate sensor 57 and the medium container 52 are circulated, and the temperature rise of the battery 6 is realized. It is understood that the flow rate of the coolant flowing into each battery 6 can be adjusted by adjusting the opening degree of the valve 58, thereby adjusting the heating/cooling power of each battery.
According to an embodiment of the present invention, when the temperature adjustment system operates in the cooling mode, the controller obtains a power difference between the temperature adjustment required power P1 of a certain battery 6 and the temperature adjustment actual power P2 when the temperature adjustment required power P1 of the battery is greater than the temperature adjustment actual power P2 corresponding to the battery, and increases the power of the compressor for cooling the battery 6 according to the power difference, or increases the flow rate of the cooling liquid of the battery 6 to increase the cooling power of the battery 6, and decreases the power of the compressor or keeps the power of the compressor constant, or adjusts the flow rate of the cooling liquid of the battery to decrease the cooling power of the battery 6 when the temperature adjustment required power P1 of the certain battery 6 is less than or equal to the temperature adjustment actual power P2.
Specifically, if a plurality of batteries 6 are connected in parallel, when the temperature regulation system operates in the cooling mode, the battery management controller obtains the temperature regulation required power P1 of the batteries, the battery thermal management controller obtains the temperature regulation actual power P2 of the batteries, and the vehicle-mounted air conditioning controller makes a judgment according to the temperature regulation required power P1 and the temperature regulation actual power P2. If the required power P1 for temperature adjustment of one of the batteries 6 is greater than the actual power P2 for temperature adjustment, it means that if the temperature of the battery 6 cannot be reduced within the target time according to the current cooling power or the current coolant flow rate, the vehicle air conditioner controller obtains the power difference between the required power P1 for temperature adjustment of the battery and the actual power P2 for temperature adjustment, and increases the power of the compressor 1 according to the power difference, or increases the coolant flow rate of the battery, that is, increases the opening degree of the second expansion valve 42, to increase the cooling power of the battery, wherein the larger the power difference between the required power P1 for temperature adjustment and the actual power P2 for temperature adjustment, the more the power of the compressor 1 and the coolant flow rate of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If the temperature regulation required power P1 of one of the batteries 6 is less than or equal to the temperature regulation actual power P2, the vehicle air conditioner controller may keep the power of the compressor 1 unchanged or reduce the power of the compressor 1 appropriately, or reduce the flow rate of the coolant of the battery, i.e., reduce the opening degree of the second expansion valve 42, to reduce the cooling power of the battery. When the temperature of all the batteries 6 is lower than 35 ℃, the cooling of the batteries 6 is completed, the battery management controller sends information for closing the temperature adjusting function to the vehicle-mounted air conditioner through CAN communication, and the vehicle-mounted air conditioner controller controls the second electronic valve 43 to close. If the temperature of the battery 6 is still higher than 35 c after the thermostat system has entered the cooling mode for a longer period of time, for example, after 1 hour, the cooling power of the battery is increased appropriately so that the battery is cooled down as soon as possible.
According to an embodiment of the present invention, when the temperature adjustment system operates in the heating mode, the controller obtains a power difference between the temperature adjustment required power P1 and the temperature adjustment actual power P2 of a certain battery when the temperature adjustment required power P1 of the certain battery is greater than the temperature adjustment actual power P2, and increases the power of the heater 53 for heating the battery according to the power difference, or adjusts the flow rate of the cooling liquid for increasing the heating power of the battery, and decreases the power, or keeps the power of the heater 53 constant, or adjusts the flow rate of the cooling liquid for decreasing the battery when the temperature adjustment required power P1 of the certain battery is less than or equal to the temperature adjustment actual power P2, to decrease the heating power of the battery.
Specifically, if the batteries are plural and connected in parallel, the battery management controller acquires the temperature-regulation required power P1 of the batteries when the temperature regulation system is operating in the heating mode, and the battery thermal management controller acquires the temperature-regulation actual power P2 of the batteries. If the temperature regulation required power P1 of one of the batteries 6 is greater than the temperature regulation actual power P2, it indicates that if the temperature rise of the battery 6 cannot be completed within the target time according to the current heating power or cooling liquid flow, therefore, the battery thermal management controller obtains the power difference between P1 and P2 of the battery, and increases the power of the heater 53 for heating the battery 6 according to the power difference, or adjusts and increases the cooling liquid flow of the battery, for example, the rotation speed of the pump 51 may be increased, so that the battery can complete the temperature regulation within the target time. Wherein the larger the difference between the temperature regulation required power P1 and the temperature regulation actual power P2 is, the more the power of the heater 53 and the flow rate of the coolant of the battery circuit are increased. If the temperature adjustment required power P1 of a certain battery is less than or equal to the temperature adjustment actual power P2, the controller can reduce the power of the heater 53, or keep the power of the heater 53 unchanged, or reduce the flow rate of the cooling liquid of the battery circuit to reduce the heating power of the battery. When the temperature of all the batteries 6 is higher than a preset temperature, for example, 10 ℃, the heating of the batteries 6 is completed, the battery management controller sends a message for turning off the temperature adjustment function to the vehicle air conditioner through CAN communication, and the battery management controller controls the heater 53 to be turned off. If the temperature of the battery 6 remains below 10 c after the thermostat has entered the heating mode for an extended period of time, such as 1 hour, the battery thermal management controller may again increase the power to the heater 53 and the speed of the pump 51 as appropriate to allow the battery to finish warming as quickly as possible.
According to an embodiment of the present invention, the controller is further configured to decrease the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is less than the corresponding temperature-regulation actual power P2, and increase the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is greater than the corresponding temperature-regulation actual power P2.
Specifically, when the temperature regulation system enters the heating mode or the cooling mode, if the temperature regulation required power P1 of a certain battery 6 is smaller than the temperature regulation actual power P2, the controller controls the rotation speed of the pump 51 to be reduced to save electric power. If the required power P1 for temperature adjustment of a certain battery 6 is greater than the actual power P2 for temperature adjustment, the controller controls the power of the heater 53 and the compressor 1 to be increased or the flow rate of the cooling fluid in the circuit in which the battery is located to be increased, and controls the rotation speed of the pump 51 to be increased, so that the mass of the cooling fluid flowing through the cross section of the cooling flow path in unit time can be increased, and the actual power P2 for temperature adjustment of the battery can be increased to realize temperature adjustment within the target time t.
If a single compressor 1 cannot meet the power required to cool a plurality of batteries 6, a plurality of compressors 1 may be provided to supply cooling power to the batteries 6. As on a bus there are typically 4 compressors, and these 4 compressors can now all be used to provide cooling power to the battery 6.
According to an embodiment of the present invention, if there are a plurality of compressors 1 for supplying the refrigerant to the batteries, the controller is further configured to judge the number of compressors to be started based on the temperature regulation demand power P1 of each battery and the maximum cooling power P of each compressor, and to control the corresponding number of compressors 1 to be started when the temperature regulation system is in the cooling mode.
Further, the controller may generate a total temperature adjustment required power Pz according to the temperature adjustment required power P1 of each battery, and the controller controls the plurality of compressors 1 to be simultaneously started when judging that the total temperature adjustment required power Pz is greater than the maximum cooling power P of a single compressor.
For example, when the number of the compressors 1 for supplying the refrigerant to the plurality of batteries 6 is 2, the controller separately obtains the P1 of each battery 6 when the temperature regulation system enters the cooling mode, and adds the P1 of each battery to calculate the total temperature regulation required power Pz of the entire temperature regulation system. If Pz is less than or equal to the maximum cooling power of a single compressor 1, the controller may control one compressor 1 to start. And if the Pz is larger than the maximum refrigerating power of the single compressor 1, the controller controls the two compressors 1 to start to work simultaneously so as to meet the cooling refrigerating power demand of the battery 6.
In order to make the present invention more clearly understood by those skilled in the art, the operation of the temperature regulation system of the vehicle-mounted battery shown in fig. 9 will be described below with reference to a specific embodiment.
The battery 6 includes a first battery 61 and a second battery 62, Pz is P11+ P12, P11 is the temperature regulation required power of the first battery 61, P12 is the temperature regulation required power of the second battery 62, and Pz is the sum of the temperature regulation required powers of the first battery 61 and the second battery 62 (total temperature regulation required power Pz). Pf is P21+ P22, P21 is the temperature-regulated actual power of the battery 61, P22 is the temperature-regulated actual power of the battery 62, and Pf is the sum of the temperature-regulated actual powers of the first battery 61 and the second battery 62.
When the temperature of a certain battery is greater than a first temperature threshold (e.g., 40 ℃), the temperature regulation system of the vehicle-mounted battery operates in the cooling mode, and if the sum of the total temperature regulation required power Pz and the in-vehicle cooling required power P4 is less than the compressor maximum cooling power P, i.e., Pz + P4 ≦ P, the compressor 1 is controlled to operate at the cooling power Pz + P4. It will be appreciated that Pz < P and P4 < P in this case.
If Pz + P4 is more than P, whether the temperature of the first battery 61 or the second battery 62 is more than 45 ℃ is judged, if so, cooling power is preferentially provided for battery cooling, the controller controls the compressor 1 to operate according to the maximum cooling power P, the cooling power of the battery cooling branch 4 is Pz, and the cooling power of the in-vehicle cooling branch 3 is equal to P-Pz.
If the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, cooling power is preferentially provided for the vehicle, the compressor 1 operates according to the maximum refrigerating power P, the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch in the battery is equal to P-P4. The first battery 61 cooling branch and the second battery 62 cooling branch scale down the cooling power. The ratio may be: (P-P4)/(P11+ P12). If the temperature in the vehicle has reached the set temperature, the cooling power of the battery is preferentially satisfied.
The sum of the actual power is adjusted to Pf by the temperature of the first battery 61 and the second battery 62, and when Pz > Pf, the power to be adjusted is Pc (Pc — Pz-Pf). If Pz + P4+ Pc is less than or equal to P, the compressor requires an increased cooling power of Pc, the opening degree of the second expansion valve 42 is increased, and the rotation speed of the pump 51 is increased. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is decreased so that the cooling power of the first battery 61 is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the second battery 62 is reduced.
If Pz + P4+ Pc > P (and Pz + Pc ≦ P), then the following determination is made:
it is judged whether or not the temperatures of the first battery 61 and the second battery 62 are greater than 45 ℃. If the temperature is higher than 45 ℃, cooling power is preferentially provided for cooling the battery, the compressor operates according to the maximum refrigeration power, the rotating speed of the pump 51 is increased, the cooling power of the battery cooling branch is increased by Pc, and the power of the in-vehicle cooling branch is decreased by Pc. If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is decreased so that the cooling power of the first battery 61 is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the second battery 62 is reduced.
If the temperature of the battery is not more than 45 ℃ and the temperature in the vehicle does not reach the set temperature, cooling power is preferentially provided for the vehicle, the compressor operates according to the maximum refrigerating power P, the rotating speed of the pump 51 is increased, the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is equal to P-P4. The first battery 61 cooling branch and the second battery 62 cooling branch scale down the cooling power. The ratio may be: (P-P4)/(P11+ P12). The cooling power of the first cell 61 was P11 × (P-P4)/(P11+ P12), and the cooling power of the second cell 62 was P12 × (P-P4)/(P11+ P12).
If the in-vehicle temperature has reached the set temperature, the cooling power of the battery is preferentially satisfied, the compressor is operated at the maximum power P, the opening degree of the second expansion valve 42 is increased, the rotation speed of the pump 51 is increased, so that the battery cooling branch circuit cooling power is increased by Pc. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is decreased, so that the cooling power of the battery 61 is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the second battery 62 is reduced.
When Pz is equal to or less than Pf and the power to be adjusted is Pc (Pc-Pf-Pz), the compressor cooling power is maintained, the compressor cooling power is reduced, the opening degree of the second expansion valve 42 is decreased, or the rotation speed of the pump 51 is decreased. If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is decreased so that the cooling power of the first battery 61 is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the second battery 62 is reduced.
When the number of the compressors 1 for supplying the cooling power to the battery is plural and the sum of the maximum cooling powers of the plural compressors is P5, the battery cooling power adjustment may be:
(1) when Pz > Pf, the power to be adjusted is Pc (Pc — Pz), and if Pz + P4+ Pc is equal to or less than P5, the refrigeration power required to be increased by the compressor is Pc, the opening of the second expansion valve is increased, and the pump speed is increased. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is decreased so that the cooling power of the first battery 61 is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the battery 62 is reduced.
If Pz + P4+ Pc > P5 (and Pz + Pc ≦ P5), then the following determination is made:
and judging whether the battery temperature is higher than 45 ℃. If the temperature is higher than 45 ℃, cooling power is preferentially provided for cooling the battery, the compressor operates according to the maximum refrigeration power, the rotating speed of the water pump is increased, the cooling power of the battery cooling branch is increased by Pc, and the power of the in-vehicle cooling branch is decreased by Pc.
If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the battery 61 is kept unchanged or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is reduced so that the cooling power of the first battery 61 is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the second battery 62 is reduced.
If the temperature of the battery is not more than 45 ℃ and the temperature in the vehicle does not reach the set temperature, cooling power is preferentially provided for the vehicle, all the compressors run according to the maximum refrigerating power, the rotating speed of the water pump is increased, the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is P5-P4. The first battery 61 cooling branch and the second battery 62 cooling branch scale down the cooling power. The ratio may be: (P5-P4)/(P11+ P12). The cooling power of the first cell 61 was P11 × (P5-P4)/(P11+ P12), and the cooling power of the second cell 62 was P12 × (P5-P4)/(P11+ P12).
If the temperature in the vehicle reaches the set temperature, the cooling power of the battery is preferentially met, all the compressors run at the maximum power, the opening degree of the second expansion valve is increased, the rotating speed of the water pump is increased, and the cooling power of the battery cooling branch loop is increased by Pc. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is decreased so that the cooling power of the first battery 61 is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the battery 62 is reduced.
(2) When Pz is equal to or less than Pf and the power to be adjusted is Pc (Pc — Pf Pz), the compressor cooling power is maintained, the compressor cooling power is reduced, the opening degree of the second expansion valve 42 is decreased, or the rotation speed of the pump 51 is decreased. If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the cooling power of the battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is decreased so that the cooling power of the first battery 61 is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the cooling power of the second battery 62 is reduced.
When the temperature of the vehicle-mounted battery is less than the second temperature threshold value (e.g., 0 ℃), when the heating mode in which the temperature adjustment system of the vehicle-mounted battery operates, if Pz > Pf and the power that needs to be adjusted is Pc (Pc ═ Pz-Pf), the heating power of the heater 53 is increased by Pc, increasing the rotation speed of the pump 51. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the heating power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the heating power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the heating power of the first battery 61 is kept unchanged, or the opening degree of the valve 58 controlling the loop in which the first battery 61 is located is reduced, so that the heating power of the first battery 61 is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the heating power of the second battery 62 is reduced.
If Pz is less than Pf and the power to be regulated is Pc (Pc is Pz-Pf), the power of the heater is kept unchanged, or the heating power Pc is reduced, or the pump speed is reduced. The following processes are carried out simultaneously:
If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first cell 61 is increased, so that the heating power of the first cell 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the heating power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept unchanged or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is reduced, so that the heating power of the first battery 61 is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the heating power of the battery 62 is reduced.
In order to keep the temperatures of the first battery 61 and the second battery 62 equalized, the following process may be performed:
in the battery cooling process, if the battery temperature difference between the temperature T61 of the first battery 61 and the temperature T62 of the second battery 62 exceeds 3 ℃, the temperature value is a preset value, namely if T61-T62 > 3 ℃, the battery thermal management controller controls the opening degree of the valve 58 in the cooling branch of the first battery 61 to be increased, and controls the opening degree of the valve 58 in the cooling branch of the second battery 62 to be decreased, so that the cooling power of the first battery 61 is increased, and the cooling power of the second battery 62 is decreased, thereby realizing the temperature equalization of the first battery 61 and the second battery 62. And if T62-T61 is more than 3 ℃, the battery thermal management controller controls the opening degree of the valve 58 in the cooling branch of the second battery 62 to increase, and controls the opening degree of the valve 58 in the cooling branch of the first battery 61 to decrease, so that the cooling power of the second battery 62 is increased, and the cooling power of the first battery 61 is decreased, and therefore the temperature equalization of the first battery 61 and the second battery 62 is realized.
In the battery heating process, if the battery temperature difference between the first battery 61 and the second battery 62 exceeds 3 ℃, namely if T61-T62 is greater than 3 ℃, the battery thermal management controller controls the opening degree of the valve 58 in the cooling branch of the battery 61 to be reduced, and controls the opening degree of the valve 58 in the cooling branch of the battery 62 to be increased, so that the heating power of the first battery 61 is reduced, and the heating power of the second battery 62 is increased, thereby realizing the temperature equalization of the first battery 61 and the second battery 62. If T62-T61 is more than 3 ℃, the battery thermal management controller controls the opening degree of the valve 58 in the cooling branch of the battery 62 to be reduced, and controls the opening degree of the valve 58 in the cooling branch of the battery 61 to be increased, so that the heating power of the first battery 61 is increased, and the heating power of the second battery 62 is reduced, and therefore the temperature equalization of the first battery 61 and the second battery 62 is realized.
According to the temperature adjusting system of the vehicle-mounted battery, the temperature adjusting required power and the temperature adjusting actual power of the plurality of batteries connected in parallel are obtained through the battery temperature adjusting module, and the temperature of the plurality of batteries connected in parallel is adjusted according to the temperature adjusting required power and the temperature adjusting actual power of the plurality of batteries connected in parallel. Therefore, the system can accurately control the heating power and the cooling power of each battery according to the actual state of each battery, and adjust the temperature when the temperature of the battery is too high or too low, so that the temperature of the battery is maintained in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
Fig. 10 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a sixth embodiment of the invention. As shown in fig. 10, the temperature adjustment method for the vehicle-mounted battery includes the following steps:
s1, temperature regulation required powers P1 of the plurality of batteries connected in parallel are obtained respectively.
Further, according to an embodiment of the present invention, the obtaining the temperature regulation required power P1 of the plurality of batteries connected in parallel respectively specifically includes: the method comprises the steps of respectively obtaining a first parameter of each battery during opening temperature adjustment, and generating first temperature adjustment required power of each battery according to the first parameter. And respectively acquiring a second parameter of each battery during temperature adjustment, and generating a second temperature adjustment required power of each battery according to the second parameter. The temperature regulation required power P1 of each battery is generated according to the first temperature regulation required power of each battery and the second temperature regulation required power of each battery respectively.
Further in accordance with an embodiment of the present inventionIn an embodiment, the generating the first temperature adjustment required power of each battery according to the first parameter includes: a first temperature difference Delta T between an initial temperature and a target temperature is obtained 1. According to the first temperature difference Delta T1And the target time t generates the first temperature regulation required power P1.
Still further, according to an embodiment of the present invention, the first temperature regulation required power is generated by the following formula (1):
ΔT1*C*M/t, (1)
wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
According to an embodiment of the present invention, the second parameter is an average current I of each battery cell for a preset time, and the second temperature adjustment required power of each battery cell is generated by the following formula (2):
I2*R, (2)
wherein I is the average current and R is the internal resistance of the battery.
s2, obtaining the temperature adjusting actual power P2 of a plurality of batteries connected in parallel.
According to an embodiment of the present invention, the obtaining the temperature-regulated actual power P2 of the plurality of batteries connected in parallel respectively specifically includes: the inlet temperature and the outlet temperature of the flow path for adjusting the temperature of each cell are acquired, and the flow velocity v of the coolant flowing into the flow path is acquired. Generating a second temperature difference Δ T according to an inlet temperature and an outlet temperature of a flow path of each cell2. According to the second temperature difference Delta T of each battery2And the flow rate v generates a temperature regulated actual power P2.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is further generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2For the second temperature difference, c being the coolant in the flow pathAnd m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
s3, adjusting the temperature of the plurality of parallel batteries according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the plurality of parallel batteries respectively.
According to an embodiment of the present invention, the battery temperature adjustment module is controlled to adjust the temperature of the battery to reach the target temperature for the target time t according to the temperature adjustment required power P1 and the temperature adjustment actual power P2.
Specifically, after the vehicle is powered on, whether the battery needs to be subjected to temperature adjustment is judged, if the battery needs to be subjected to temperature adjustment, the initial temperature (namely the current temperature), the target temperature and the target time t from the initial temperature to the target temperature of each battery are respectively obtained, wherein the target temperature and the target time t can be preset according to actual conditions, and the first temperature adjustment required power is calculated according to a formula (1). Meanwhile, the average current I of each battery in the preset time is respectively obtained, and the second temperature regulation required power of each battery is respectively calculated according to the formula (2). Then, the temperature regulation required power P1 (required power for regulating the temperature of the battery to the target temperature) of each battery is calculated based on the first temperature regulation required power and the second temperature regulation required power of each battery, respectively. Further, the inlet temperature and the outlet temperature of each cell are acquired, the flow rate information is acquired, and the temperature-regulated actual power P2 of each cell is calculated according to the formula (3). Finally, the cells were temperature regulated according to P1 and P2, respectively, for each cell. Therefore, the control method can accurately control the heating power and the cooling power of each battery according to the actual state of each battery, and adjust the temperature when the temperature of the battery is too high or too low, so that the temperature of the battery is maintained in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
How the temperature of the battery is adjusted according to the temperature-adjustment required power P1 and the temperature-adjustment actual power P2 of the battery is described below with reference to specific embodiments.
When the vehicle-mounted battery includes a plurality of batteries connected in parallel, according to an embodiment of the present invention, as shown in fig. 8, controlling the battery temperature adjustment module to adjust the temperature of the battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the plurality of batteries connected in parallel, respectively, may further include: the total temperature adjustment required power Pz is generated from the temperature adjustment required powers P1 of the plurality of parallel-connected batteries. And judging whether the total temperature regulation required power Pz is matched with the maximum refrigerating power P of the vehicle-mounted air conditioner. If so, the required power P1 is adjusted according to the temperature of the batteries connected in parallel to cool the batteries connected in parallel. And if not, adjusting the required power P1 according to the maximum refrigerating power P of the air conditioner and the temperatures of the plurality of parallel batteries to cool the plurality of parallel batteries.
Specifically, the total temperature adjustment required power Pz of the entire temperature adjustment system may be calculated according to the temperature adjustment required power P1 of each battery, that is, the total temperature adjustment required power Pz may be obtained by adding the temperature adjustment required power P1 of each battery. And then, according to the total temperature adjustment required power Pz, judging whether the Pz is matched with the maximum refrigerating power P of the vehicle-mounted air conditioner, namely judging whether the Pz is less than or equal to P, and if so, adjusting the required power P1 according to the temperature of each battery to cool each battery by controlling the flow rate of the cooling liquid flowing into each battery and controlling the power of a compressor. And if the Pz is not matched with the maximum refrigerating power P of the vehicle-mounted air conditioner, namely the Pz is larger than the P, the controller adjusts the required power P1 according to the maximum refrigerating power P of the air conditioner and the temperature of each battery, and the flow of the cooling liquid is distributed in proportion by adjusting the flow of the cooling liquid flowing into each battery, so that each battery can be cooled at the maximum efficiency.
When the number of the batteries is a plurality of batteries connected in parallel, according to an embodiment of the present invention, the method for regulating the temperature of the batteries may further include the steps of: the temperatures of a plurality of batteries connected in parallel are detected. Entering a cooling mode when the temperature of at least one battery of the plurality of batteries connected in parallel is greater than a first temperature threshold. And entering a heating mode when the temperature of at least one battery in the plurality of batteries connected in parallel is less than a second temperature threshold value. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the temperature of each battery is detected in real time and is judged. If the temperature of one of the batteries is higher than 40 ℃, the temperature of the battery is over high at the moment, and in order to avoid the influence of the high temperature on the performance of the battery, the battery needs to be cooled, enters a cooling mode, and sends a battery cooling function starting message to an air conditioning system.
If the temperature of a certain battery is lower than 0 ℃, the temperature of the battery is too low at the moment, and in order to avoid the influence of low temperature on the performance of the battery, the battery needs to be subjected to temperature rise treatment, enters a heating mode, controls the cooling branch of the battery to be closed, and controls the heater to be opened to provide heating power for the battery.
In order to keep the temperatures of the first battery and the second battery balanced, the following process may be performed:
for example, as shown in fig. 9, when the batteries include a first battery and a second battery, in the battery cooling process, if the battery temperature difference between the temperature T61 of the first battery and the temperature T62 of the second battery exceeds 3 ℃, the temperature value is a preset value, that is, if T61-T62 > 3 ℃, the battery thermal management controller controls the opening degree of the regulating valve in the first battery cooling branch to be increased, and controls the opening degree of the regulating valve in the second battery cooling branch to be decreased, so that the cooling power of the first battery is increased and the cooling power of the second battery is decreased, thereby achieving temperature equalization of the first battery and the second battery.
And if T62-T61 is more than 3 ℃, controlling the opening degree of the regulating valve in the cooling branch of the second battery to increase, and controlling the opening degree of the regulating valve in the cooling branch of the first battery to decrease, so that the cooling power of the second battery is increased, and the cooling power of the first battery is decreased, thereby realizing the temperature balance of the first battery and the second battery.
In the battery heating process, if the battery temperature difference between the first battery and the second battery exceeds 3 ℃, namely if T61-T62 is more than 3 ℃, the battery thermal management controller controls the opening degree of the regulating valve in the first battery cooling branch to be reduced, and controls the opening degree of the regulating valve in the second battery cooling branch to be increased, so that the heating power of the first battery is increased, and the heating power of the second battery is reduced, thereby realizing the temperature balance of the first battery and the second battery. And if the temperature T62-T61 is more than 3 ℃, controlling the opening degree of the regulating valve in the second battery cooling branch to be reduced, and controlling the opening degree of the regulating valve in the first battery cooling branch to be increased so as to increase the heating power of the second battery and reduce the heating power of the first battery, thereby realizing the temperature equalization of the first battery and the second battery.
According to an embodiment of the present invention, when the cooling mode is adopted, the adjusting the temperature of the plurality of parallel batteries according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the plurality of parallel batteries respectively includes: and judging whether the temperature regulation required power P1 of each battery is larger than the temperature regulation actual power P2 corresponding to each battery. If the temperature regulation required power P1 of a certain battery is larger than the temperature regulation actual power P2 corresponding to the battery, acquiring the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increasing the power of a compressor for cooling the battery according to the power difference or adjusting and increasing the flow of cooling liquid of the battery to increase the cooling power of the battery. If the temperature regulation required power P1 of a certain battery is less than or equal to the temperature regulation actual power P2 corresponding to the battery, reducing the power of the compressor or keeping the power of the compressor unchanged, or regulating and reducing the flow of the cooling liquid of the battery to reduce the cooling power of the battery.
Specifically, when operating in the cooling mode, P1 and P2 of each battery are acquired, respectively, and judged. If the P1 of one of the batteries is larger than the P2, the fact that the temperature of the battery cannot be reduced within the target time according to the current refrigerating power or the current cooling liquid flow is shown, so the power difference between the P1 and the P2 of the battery is obtained, the power of the compressor 1 is increased according to the power difference, or the cooling liquid flow of the battery is increased to increase the cooling power of the battery, wherein the larger the power difference between the P1 and the P2 is, the more the power of the compressor and the cooling liquid flow of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If the P1 of one of the batteries is less than or equal to P2, the power of the compressor 1 can be kept unchanged or reduced appropriately, or the cooling power of the battery can be reduced by reducing the flow of the cooling liquid of the battery. When the temperature of all the batteries is lower than 35 ℃, the batteries are cooled, the information of turning off the temperature regulation function is sent to the vehicle-mounted air conditioner through CAN communication, and the battery cooling branch is controlled to be turned off. If the temperature of the battery is still higher than 35 ℃ after the temperature regulating system enters the cooling mode for a long time, for example, after 1 hour, the cooling power of the battery is appropriately increased so that the battery is cooled down as soon as possible.
According to an embodiment of the invention, when the heating mode is used, the adjusting of the temperature of the plurality of parallel batteries according to the temperature adjusting required power P1 and the temperature adjusting actual power P2 of the plurality of parallel batteries respectively comprises the following specific steps: and judging whether the temperature regulation required power P1 of each battery is larger than the temperature regulation actual power P2 corresponding to each battery. If the temperature regulation required power P1 of a certain battery is larger than the temperature regulation actual power P2 corresponding to the battery, acquiring the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increasing the power of a heater for cooling the battery according to the power difference or adjusting and increasing the flow of cooling liquid of the battery to increase the heating power of the battery.
Specifically, when in the heating mode, P1 and P2 of each battery are acquired, respectively, and judged. If P1 of one of the batteries is larger than P2, the temperature rise of the battery cannot be completed within the target time t according to the current heating power or the current cooling liquid flow, so the power difference between P1 and P2 of the battery is obtained, the power of a heater for heating the battery is increased according to the power difference, or the cooling liquid flow of the battery is adjusted and increased, so that the temperature adjustment of the battery can be completed within the target time t. Wherein, the larger the difference between P1 and P2, the more the power of the heater and the flow rate of the coolant of the battery circuit are increased. If P1 of a certain battery is less than or equal to P2, the power of the heater can be reduced appropriately, or the power of the heater can be kept unchanged, or the flow of the cooling liquid of the battery loop can be adjusted and reduced, so that the heating power of the battery can be reduced. When the temperature of all the batteries is higher than a preset temperature, for example, 10 ℃, the heating of the batteries is completed, information for turning off the temperature adjusting function is sent to the vehicle-mounted air conditioner through the CAN communication, and the heaters are controlled to be turned off. If the temperature of the battery is still below 10 c after the temperature regulating system enters the heating mode for a long time, for example, after 1 hour, the power of the heater and the rotation speed of the pump are increased appropriately to complete the temperature rise of the battery as soon as possible.
According to an embodiment of the present invention, the temperature adjustment method of the vehicle-mounted battery may further include: if the temperature regulation required power P1 of a certain battery is smaller than the corresponding temperature regulation actual power P2, reducing the rotating speed of the pump; if the temperature regulation required power P1 of a certain battery is larger than the corresponding temperature regulation actual power P2, the rotation speed of the pump is increased.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if P1 of a certain battery is less than P2, the rotation speed of the pump is controlled to be reduced to save electric power. And if the P1 of a certain battery is larger than the P2, besides controlling the power of the heater and the compressor to be increased or controlling the flow rate of the cooling liquid in the loop where the battery is positioned to be increased, the rotating speed of the pump can be controlled to be increased so as to increase the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time, and therefore the temperature of the battery is adjusted to be actually adjusted to be P2, and temperature adjustment is achieved within the target time t.
In order to make the present invention more clearly understood by those skilled in the art, the temperature adjustment method of the vehicle-mounted battery system is described below in conjunction with specific embodiments.
As shown in fig. 9, the battery may include a first battery and a second battery, Pz is P11+ P12, P11 is the temperature regulation required power of the first battery, P12 is the temperature regulation required power of the second battery, and Pz is the sum of the temperature regulation required powers of the first battery and the second battery (total temperature regulation required power Pz). Pf is P21+ P22, P21 is the temperature-regulated actual power of the battery, P22 is the temperature-regulated actual power of the battery, and Pf is the sum of the temperature-regulated actual powers of the first battery and the second battery.
When the temperature of a certain battery is greater than a first temperature threshold (e.g., 40 ℃), the temperature regulation system for the vehicle-mounted battery operates in the cooling mode, and if the sum of the total battery cooling required power Pz and the in-vehicle cooling required power P4 is less than the compressor maximum cooling power P, i.e., Pz + P4 ≦ P, the compressor 1 is controlled to operate at the cooling power Pz + P4. It will be appreciated that Pz < P and P4 < P in this case.
And if the Pz + P4 is greater than P, judging whether the temperature of the first battery or the second battery is greater than 45 ℃, if so, preferentially providing cooling power for cooling the battery, controlling the compressor to operate according to the maximum cooling power P by the controller, wherein the cooling power of the battery cooling branch is Pz, and the cooling power of the in-vehicle cooling branch is equal to P-Pz.
And if the temperature of the battery is not more than 45 ℃ and the temperature in the vehicle does not reach the set temperature, preferentially providing cooling power for the vehicle, operating the compressor according to the maximum refrigerating power P, wherein the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is equal to P-P4. The first battery cooling branch and the second battery cooling branch reduce cooling power in proportion. The ratio may be: (P-P4)/(P11+ P12). If the temperature in the vehicle has reached the set temperature, the cooling power of the battery is preferentially satisfied.
The sum of the actual power of the temperature adjustment of the first battery and the second battery is Pf, and when Pz > Pf, the power that needs to be adjusted is Pc (Pc ═ Pz-Pf). If Pz + P4+ Pc is equal to or less than P, the opening degree of the second expansion valve is increased and the rotation speed of the pump 51 is increased. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the cooling power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery is kept unchanged or the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be reduced, so that the cooling power of the first battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the valve 58 of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the second battery is reduced.
If Pz + P4+ Pc > P (and Pz + Pc ≦ P), then the following determination is made:
and judging whether the temperatures of the first battery and the second battery are more than 45 ℃. If the temperature is higher than 45 ℃, cooling power is preferentially provided for cooling the battery, the compressor operates according to the maximum refrigeration power, the rotating speed of the pump is increased, the cooling power of the battery cooling branch is increased by Pc, and the power of the in-vehicle cooling branch is decreased by Pc. If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the cooling power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the cooling power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery is kept unchanged or the opening degree of the regulating valve of the loop in which the first battery is located is controlled to be reduced, so that the cooling power of the battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the second battery is reduced.
If the temperature of the battery is not more than 45 ℃ and the temperature in the vehicle does not reach the set temperature, cooling power is preferentially provided for the vehicle, the compressor operates according to the maximum refrigerating power P, the rotating speed of the pump is increased, the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is equal to P-P4. The first battery 61 cooling branch and the second battery 62 cooling branch scale down the cooling power. The ratio may be: (P-P4)/(P11+ P12). The cooling power of the first cell was P11 × (P-P4)/(P11+ P12), and the cooling power of the second cell was P12 × (P-P4)/(P11+ P12).
If the temperature in the vehicle reaches the set temperature, the cooling power of the battery is preferentially met, the compressor runs at the maximum power P, the opening degree of the second expansion valve is increased, the rotating speed of the pump is increased, and the cooling power of the battery cooling branch loop is increased by Pc. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the cooling power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the cooling power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery is kept unchanged or the opening degree of the regulating valve of the loop in which the first battery is located is controlled to be reduced, so that the cooling power of the battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the second battery is reduced.
When Pz is equal to or less than Pf and the power to be adjusted is Pc (Pc-Pf-Pz), the compressor cooling power is maintained, the compressor cooling power is reduced, the opening degree of the second expansion valve is reduced, or the rotation speed of the pump is reduced. If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the cooling power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 for controlling the loop of the second battery is increased, so that the cooling power of the battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant or the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be decreased so that the cooling power of the first battery is decreased. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the adjustment opening degree of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the second battery is reduced.
When the temperature of the on-vehicle battery is less than the second temperature threshold (e.g., 0 ℃), and the temperature of the on-vehicle battery regulates the heating mode in which the system operates, if Pz > Pf, and the power to be regulated is Pc (Pc ═ Pz-Pf), the heating power of the heater is increased by Pc, and the rotation speed of the pump is increased. The following processes are carried out simultaneously:
If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the heating power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the heating power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery is kept unchanged or the opening degree of the regulating valve of the loop in which the first battery is located is controlled to be reduced, so that the heating power of the first battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the heating power of the second battery is reduced.
If Pz is less than Pf and the power to be regulated is Pc (Pc is Pz-Pf), the power of the heater is kept unchanged, or the heating power Pc is reduced, or the pump speed is reduced. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the heating power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the heating power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the heating power of the first battery is kept unchanged, or the opening degree of the regulating valve of the loop in which the first battery is located is controlled to be reduced, so that the heating power of the first battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the heating power of the battery is reduced.
According to an embodiment of the present invention, the compressor for supplying the refrigerant to the battery is plural, and the temperature adjusting method of the battery may further include: the number of compressors to be started is judged according to the temperature regulation demand power P1 of each battery and the maximum cooling power of each compressor. When the cooling mode is adopted, a corresponding number of compressors are controlled to start.
Further, the step of judging the number of started compressors according to the temperature regulation demand power P1 of each battery and the maximum cooling power P of each compressor specifically includes: according to eachThe battery temperature regulation required power P1 generates a total temperature regulation actual power PZ(ii) a Judging the total temperature regulation demand power PZWhether it is greater than the maximum refrigeration power P of a single compressor; and if the maximum refrigerating power P of the single compressor is larger than the maximum refrigerating power P of the single compressor, controlling the plurality of compressors to start simultaneously.
Specifically, when the number of the compressors is plural, the in-vehicle cooling branch and the battery cooling branch are plural, respectively. For example, when the number of compressors for supplying the refrigerant to the batteries is 2, and the number of the in-vehicle cooling branch and the battery cooling branch are 2, when the thermostat system enters the cooling mode, P1 of each battery is separately obtained, and the total thermostat demand power P of the entire thermostat system can be calculated by adding P1 of each battery Z. If P isZAnd if the maximum refrigerating power P is less than or equal to the maximum refrigerating power P of a single compressor, controlling the starting of one compressor. And if the Pz is larger than the maximum refrigerating power P of the single compressor, controlling the two compressors to start to work simultaneously so as to meet the cooling refrigerating power requirement of the battery.
When there are a plurality of compressors for supplying the refrigerant to the battery and the sum of the maximum cooling powers of the plurality of compressors is P5, the battery cooling power adjustment may be:
(1) when Pz > Pf, the power to be adjusted is Pc (Pc — Pz), and if Pz + P4+ Pc is equal to or less than P5, the refrigeration power required to be increased by the compressor is Pc, the opening of the second expansion valve is increased, and the pump speed is increased. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the cooling power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the cooling power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery is kept unchanged or the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be reduced, so that the cooling power of the first battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the battery is reduced.
If Pz + P4+ Pc > P5 (and Pz + Pc ≦ P5), then the following determination is made:
and judging whether the battery temperature is higher than 45 ℃. If the temperature is higher than 45 ℃, cooling power is preferentially provided for cooling the battery, the compressor operates according to the maximum refrigeration power, the rotating speed of the water pump is increased, the cooling power of the battery cooling branch is increased by Pc, and the power of the in-vehicle cooling branch is decreased by Pc.
If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop where the first battery is located is increased, so that the cooling power of the battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the cooling power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the battery is kept unchanged or the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be reduced, so that the cooling power of the first battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the second battery is reduced.
If the temperature of the battery is not more than 45 ℃ and the temperature in the vehicle does not reach the set temperature, cooling power is preferentially provided for the vehicle, all the compressors run according to the maximum refrigerating power, the rotating speed of the water pump is increased, the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch of the battery is P5-P4. The first battery cooling branch and the second battery cooling branch reduce cooling power in proportion. The ratio may be: (P5-P4)/(P11+ P12). The cooling power of the first cell 61 was P11 × (P5-P4)/(P11+ P12), and the cooling power of the second cell 62 was P12 × (P5-P4)/(P11+ P12).
If the temperature in the vehicle reaches the set temperature, the cooling power of the battery is preferentially met, all the compressors run at the maximum power, the opening degree of the second expansion valve is increased, the rotating speed of the water pump is increased, and the cooling power of the battery cooling branch loop is increased by Pc. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 for controlling the loop of the first battery is increased, so that the cooling power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit where the second battery is located is controlled to be increased, so that the cooling power of the second battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery is kept unchanged or the opening degree of the valve 58 controlling the circuit in which the first battery is located is reduced, so that the cooling power of the first battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the battery is reduced.
(2) When Pz is less than or equal to Pf and the power to be adjusted is Pc (Pc-Pf-Pz), the refrigeration power of the compressor is maintained, or the refrigeration power of the compressor is reduced, or the opening degree of the second expansion valve is reduced, or the rotation speed of the pump is reduced. If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be increased, so that the cooling power of the first battery is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the regulating valve of the circuit in which the second battery is located is controlled to be increased, so that the cooling power of the battery is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery is kept unchanged or the opening degree of the regulating valve of the circuit in which the first battery is located is controlled to be reduced, so that the cooling power of the first battery is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery is kept unchanged or the opening degree of the regulating valve of the loop in which the second battery is located is controlled to be reduced, so that the cooling power of the second battery is reduced.
When the temperature of the vehicle-mounted battery is less than the second temperature threshold value (e.g., 0 ℃), when the heating mode in which the temperature adjustment system of the vehicle-mounted battery operates, if Pz > Pf and the power that needs to be adjusted is Pc (Pc ═ Pz-Pf), the heating power of the heater 53 is increased by Pc, increasing the rotation speed of the pump 51. The following processes are carried out simultaneously:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first battery 61 is increased, so that the heating power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the heating power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the heating power of the first battery 61 is kept unchanged, or the opening degree of the valve 58 controlling the loop in which the first battery 61 is located is reduced, so that the heating power of the first battery 61 is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the heating power of the second battery 62 is reduced.
If Pz is less than Pf and the power to be regulated is Pc (Pc is Pz-Pf), the power of the heater is kept unchanged, or the heating power Pc is reduced, or the pump speed is reduced. The following processes are carried out simultaneously:
If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the valve 58 controlling the loop of the first cell 61 is increased, so that the heating power of the first cell 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the valve 58 controlling the loop of the second battery 62 is increased, so that the heating power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept unchanged or the opening degree of the valve 58 controlling the circuit in which the first battery 61 is located is reduced, so that the heating power of the first battery 61 is reduced. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the valve 58 controlling the loop of the second battery 62 is reduced, so that the heating power of the battery 62 is reduced. According to the temperature adjusting method of the vehicle-mounted battery, the temperature adjusting required power of the batteries connected in parallel is obtained firstly, the temperature adjusting actual power of the batteries connected in parallel is obtained secondly, and finally the temperature of the batteries connected in parallel is adjusted according to the temperature adjusting required power and the temperature adjusting actual power of the batteries connected in parallel. Therefore, the method can accurately control the heating power and the cooling power of each battery according to the actual state of each battery, and adjust the temperature when the temperature of the battery is too high or too low, so that the temperature of the battery is maintained in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
When the number of the vehicle-mounted batteries is multiple and the batteries are independently arranged, the invention also provides another temperature regulating system of the vehicle-mounted batteries.
Specifically, as shown in fig. 11A, the temperature adjustment system includes: a plurality of compressors 1, a plurality of condensers 2, a plurality of battery cooling branches 4, and a plurality of battery temperature adjustment modules 5.
Wherein, a plurality of condensers 2 link to each other with a plurality of compressors 1, and a plurality of battery cooling branch roads 4 are connected between a plurality of compressors 1 and a plurality of condensers 2, and communicate each other between a plurality of battery cooling branch roads 4. The battery temperature adjusting module 5 is respectively connected with the plurality of batteries 6 and the plurality of battery cooling branches 4, and is configured to respectively obtain temperature adjustment required power P1 and temperature adjustment actual power P2 of the plurality of batteries, adjust the temperature of the batteries according to the temperature adjustment required power P1 and the temperature adjustment actual power P2, and adjust the opening degree of the cooling capacity provided by the plurality of compressors 1 to the battery cooling branch 4 corresponding to the battery 6 according to the temperature adjustment required power P1 and the temperature adjustment actual power P2.
Further, according to an embodiment of the present invention, adjusting the temperature of the battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 specifically includes: the temperature of the battery is adjusted within the target time t according to the temperature-adjustment required power P1 and the temperature-adjustment actual power P2 to reach the target temperature.
That is, the battery temperature adjustment module 5 can ensure that the heating power and the cooling power of the on-vehicle battery are accurately controlled in accordance with the actual state of each battery 6 within the target time t when each battery 6 is temperature-adjusted in accordance with the temperature adjustment required power P1 and the temperature adjustment actual power P2, thereby adjusting the temperature when the on-vehicle battery temperature is excessively high or excessively low.
As shown in fig. 11A, taking 2 compressors 1, battery cooling branches 4, and battery temperature adjusting modules 5 and 6 as an example, the battery cooling branches 4 may include a first battery cooling branch 401 and a second battery cooling branch 402 corresponding to the first battery 61 and the second battery 62, respectively.
When the coolant of air conditioner does not insert battery temperature regulation module 5, have two pipelines in the battery cooling branch 4, first pipeline is linked together with compressor 1, and the second pipeline is linked together with battery temperature regulation module 5, and wherein, the setting that closes on of first pipeline and second pipeline mutual independence. Taking the first battery cooling branch 401 where the first battery 61 is located as an example, when the temperature of the first battery 61 is too high, the vehicle-mounted air conditioner refrigeration function is turned on, the battery cooling function is turned on, and the flow directions of the cooling liquid (such as a refrigerant) in the first pipeline and the second pipeline are respectively: compressor 1-condenser 2-first battery cooling branch 401-compressor 1; first battery cooling branch 401-battery temperature regulation module 5-first battery 61-battery temperature regulation module 5-first battery cooling branch 401.
It is understood that each battery temperature adjusting module 5 can adjust the required power and P1 and the actual power P2 according to the temperature of the corresponding battery, and adjust the cooling power/heating power of the battery by adjusting the flow rate of the cooling fluid flowing into the corresponding battery cooling branch 4, so as to ensure that the temperature of the battery is adjusted according to the actual state of each battery within the target time t. Meanwhile, because the battery cooling branches 4 are communicated with each other, the battery temperature adjusting module 5 can ensure the balance of the temperature among the batteries by adjusting the refrigerating capacity opening degree of the battery cooling branch 4 corresponding to the battery according to the temperature of each battery. Therefore, the temperature can be adjusted within the target time when the temperature of the vehicle-mounted battery is too high or too low, so that the temperature of the vehicle-mounted battery is maintained within a preset range, the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided, and the balance of the temperature among the batteries can be ensured.
According to an embodiment of the present invention, as shown in fig. 11A, the battery cooling branch 4 may include a heat exchanger 41, and the heat exchanger 41 includes a first pipe and a second pipe, the second pipe is connected to the battery temperature adjusting module 5, the first pipe is communicated with the compressor 1, wherein the first pipe and the second pipe are independently and adjacently disposed.
The battery temperature adjusting module 5 may include a flow path (not specifically shown) that adjusts the temperature of the battery, and the flow path is provided in the battery 6. A pump 51, a medium container 52, a heater 53, and a controller (not specifically shown in the drawings) connected between the flow path and the heat exchanger 41. Wherein the controller acquires the temperature regulation required power P1 of the plurality of batteries 6 and the temperature regulation actual power P2 of the batteries, and regulates the temperature of the batteries 6 according to the temperature regulation required power P1 and the temperature regulation actual power P2 of each battery. The battery cooling branch 4 may further include a second expansion valve 42 and a second electronic valve 43.
As shown in fig. 11A, the first battery cooling branch 401 may further include a first regulating valve 411 and a third regulating valve 413; the second battery cooling branch 402 may further include a second regulating valve 412 and a fourth regulating valve 414, and the connection manner of the regulating valves may specifically refer to fig. 11A, which is not described herein.
As shown in fig. 11A, the compressor 11 controls the flow rates of the refrigerants flowing through the 401 branch and the 402 branch by the first regulating valve 411 and the second regulating valve 412, respectively. The compressor 12 controls the flow rates of the refrigerants in the flow 401 branch and the flow 402 branch respectively through a third adjusting valve 413 and a fourth adjusting valve 414. The cooling power of the battery cooling branch 401 is related to the refrigerant flow rates of the first regulating valve 411 and the third regulating valve 413. The cooling power of the battery cooling branch 402 is related to the flow rates of the refrigerant in the second regulating valve 412 and the fourth regulating valve 414.
It is understood that the heat exchanger 41 may not be provided in the battery cooling branch 4, and when the heat exchanger 41 is not provided, a cooling medium flows in the battery cooling branch 4. If the heat exchanger 41 is provided, a cooling medium flows in the first pipeline and a cooling liquid flows in the second pipeline in the battery cooling branch 4.
According to an embodiment of the present invention, as shown in fig. 11A, the cell temperature adjusting module 5 may further include a first temperature sensor 55 disposed at an inlet of the flow path, a second temperature sensor 56 disposed at an outlet of the flow path, and a flow rate sensor 57. It will be appreciated that the inlet and outlet positions of the flow path are not absolute, but rather are determined by the direction of rotation of the pump 51.
Specifically, the heat exchanger 41 may be a plate heat exchanger, and the plate heat exchanger may be installed inside the vehicle-mounted air conditioner, so that the whole refrigerant loop is inside the vehicle-mounted air conditioner, the vehicle-mounted air conditioner is convenient to factory debug, and the vehicle-mounted air conditioner can supply and assemble separately, and meanwhile, the vehicle-mounted air conditioner only needs to be filled with the refrigerant once in the installation process. The coolant flows into the battery 6 from the inlet of the flow path and flows out from the outlet of the flow path, thereby achieving heat exchange between the battery 6 and the coolant.
The pump 51 is primarily used to provide power, and the media container 52 is primarily used to store and receive coolant to the temperature regulation system, and the coolant in the media container 52 can be automatically replenished when the coolant in the temperature regulation system is reduced. The heater 53 may be a PTC heater, may be in CAN communication with a controller, and provides heating power to the temperature regulation system of the vehicle battery, and is controlled by the controller. And the heater 53 is not directly contacted with the battery 6, so that the safety, the reliability and the practicability are higher.
The first temperature sensor 55 is used to detect the temperature of the cooling fluid at the inlet of the flow path, and the second temperature sensor 56 is used to detect the temperature of the cooling fluid at the outlet of the flow path. The flow rate sensor 57 is used to detect information on the flow rate of the cooling liquid in the corresponding pipe. The second electronic valve 43 is used to control the opening and closing of the corresponding battery cooling branch 4, and the second expansion valve 42 is used to control the flow rate of the coolant in the corresponding battery cooling branch 4. The controller can simultaneously control the flow of the cooling liquid in the two cooling branch circuits of the first battery 61 and the second battery 62 by adjusting the opening degrees of the first to fourth adjusting valves 411 and 414, thereby equalizing the temperatures of the two batteries. Meanwhile, the controller CAN also be in CAN communication with the vehicle-mounted air conditioner and the heater 53, CAN control the rotating speed of the pump 51 and monitor the temperature and flow information of the cooling liquid, CAN manage the battery 6, detects the voltage and temperature information of the battery 6, and controls the on-off of a temperature adjusting system of the vehicle-mounted battery.
How each battery temperature adjustment module 5 obtains the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the corresponding battery 6 is described below in conjunction with the specific embodiment.
According to an embodiment of the present invention, the controller may be configured to respectively obtain a first parameter at the time of turning on the temperature adjustment of each battery, and generate a first temperature adjustment required power of each battery according to the first parameter, and respectively obtain a second parameter at the time of temperature adjustment of each battery, and generate a second temperature adjustment required power of each battery according to the second parameter, and generate a temperature adjustment required power P1 of each battery according to the first temperature adjustment required power of each battery and the second temperature adjustment required power of each battery.
Further, according to an embodiment of the present invention, the first parameter is an initial temperature and a target temperature at which the temperature adjustment of the battery 6 is turned on and a target time T from the initial temperature to the target temperature, and the controller acquires a first temperature difference Δ T between the initial temperature and the target temperature1And according to the first temperature difference DeltaT1And the target time t generates the first temperature regulation required power.
Further, the controller generates the first temperature regulation required power by the following formula (1):
ΔT1*C*M/t (1),
Wherein, Delta T1Is a first temperature difference between the initial temperature and the target temperature, t is the target time, C is the specific heat capacity of the battery 6, and M is the mass of the battery 6.
The second parameter is an average current I of each battery 6 for a preset time, and the controller generates a second temperature regulation required power by the following formula (2):
I2*R, (2),
where I is the average current and R is the internal resistance of the battery 6.
When cooling battery 6, P1 ═ Δ T1*C*M/t+I2R; when the battery 6 is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, the controller generates the second temperature difference Δ T of each battery based on the inlet temperature detected by the first temperature sensor 55 and the outlet temperature detected by the second temperature sensor 56 of the circuit in which each battery 6 is located, respectively2And according to the second temperature difference DeltaT of each battery2And the flow rate v detected by the flow rate sensor 57 generates the temperature-adjusted actual power P2 for each cell.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
Specifically, after the vehicle is powered on, the controller determines whether the vehicle needs to be temperature-regulated, and if it is determined that the vehicle needs to be temperature-regulated, the controller turns on the temperature regulation function and sends low-speed information to the pump 51, and the pump starts to operate at a default speed (e.g., low speed). Then, the controller obtains an initial temperature (i.e., a current temperature), a target temperature, and a target time t from the initial temperature to the target temperature of each battery 6, where the target temperature and the target time t may be preset according to an actual situation, and calculates a first temperature adjustment required power of each battery according to formula (1). Meanwhile, the controller respectively obtains the average current I of each battery 6 in the preset time, and calculates the second temperature regulation required power of each battery according to the formula (2). Then, the controller calculates the temperature adjustment required power P1 (i.e., the required power for adjusting the temperature of the battery 6 to the target temperature for the target time) based on the first temperature adjustment required power and the second temperature adjustment required power of each battery 6, respectively. The controller acquires temperature information detected by the first temperature sensor 55 and the second temperature sensor 56 provided for each battery, and also acquires flow rate information detected by the flow rate sensor 57, and calculates the temperature-adjusted actual power P2 for each battery 6 according to the formula (3). Finally, the controller may adjust the required power and the actual power P1 and P2 according to the temperature of the corresponding battery, adjust the cooling power of the battery by adjusting the flow rate of the coolant flowing into the corresponding battery cooling branch 4, or adjust the heating power by adjusting the heater, so that the temperature of the battery may be adjusted according to the actual state of each battery within the target time t with certainty.
How the temperature of each battery 6 is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 according to each battery 6 will be described below with reference to specific embodiments.
According to an embodiment of the present invention, the controller may be configured to generate the total temperature-regulation required power Pz according to the temperature-regulation required power P1 of each battery, and generate the total maximum cooling power P5 of the plurality of compressors according to the maximum cooling power P of the plurality of compressors, and judge the total temperature-regulation required power P5ZWhether it is greater than the total maximum refrigerating power P5 of the plurality of compressors, wherein the required power P is adjusted when the total temperature is adjustedZWhen the total maximum refrigerating power P5 of the compressors is larger than the total maximum refrigerating power P5 of the compressors, the controller adjusts the opening degree of the refrigerating capacity of the battery cooling branch 4 corresponding to the batteries from the compressors 1 to the maximum; when the total temperature regulation required power Pz is less than or equal to the total maximum refrigerating power P5 of the plurality of compressors, the controller adjusts the refrigerating capacity opening degree of the battery cooling branch 4 corresponding to the battery 6 according to the difference between the total temperature regulation required power Pz and the total maximum refrigerating power P5.
Specifically, as shown in fig. 11A, when the batteries are cooled, the controller may calculate the total temperature adjustment required power Pz of the entire temperature adjustment system according to the temperature adjustment required power P1 of each battery, that is, the total temperature adjustment required power Pz may be obtained by adding the temperature adjustment required power P1 of each battery, and at the same time, the controller may calculate the total maximum cooling power P5 of the plurality of compressors according to the maximum cooling power P of each compressor 1, that is, the total maximum cooling power P5 may be obtained by adding the maximum cooling power P of each compressor 1. Then, the controller judges whether Pz > P5, and if so, the controller controls to adjust the opening degree of each second expansion valve 42 to the maximum to increase the inflow to each cell; the flow rate of the cooling liquid in the cooling loop 4 enables the battery to be cooled within the target time. And if the Pz is less than or equal to P5, the controller adjusts the opening degree of each second expansion valve 42 according to the difference between the Pz and P5, wherein the larger the absolute value of the difference between the Pz and P5 is, the smaller the opening degree of the second expansion valve 42 is, so as to achieve the purpose of saving energy.
According to an embodiment of the present invention, the controller is further configured to detect a temperature of the plurality of batteries, and control the temperature adjustment system to enter the cooling mode when the temperature of any one of the plurality of batteries 6 is greater than a first temperature threshold, and control the temperature adjustment system to enter the heating mode when the temperature of any one of the plurality of batteries is less than a second temperature threshold. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the controller detects the temperature of each battery 6 in real time, and makes a judgment. If the temperature of one of the batteries 6 is higher than 40 ℃, which indicates that the temperature of the battery 6 is too high at this time, in order to avoid the high temperature from affecting the performance of the battery 6, the temperature of the battery 6 needs to be reduced, the controller controls the temperature adjustment system to enter the cooling mode, sends a battery cooling function start message to the air conditioning system, and controls the corresponding second electronic valve 43 to open, so that the cooling liquid exchanges heat with the battery 6 to reduce the temperature of the battery 6.
If the temperature of a certain battery 6 is lower than 0 ℃, which means that the temperature of the battery 6 is too low at this time, in order to avoid the low temperature from affecting the performance of the battery 6, the temperature of the battery 6 needs to be raised, and the controller controls the temperature regulation system to enter a heating mode, controls the second electronic valve 43 to close, and controls the corresponding heater 53 to open, so as to provide heating power for the temperature regulation system. When the temperature regulation system operates in the heating mode, the heater 53 provides heating power to heat the first battery 61, for example, the flow direction of the cooling liquid in the loop of the first battery 61 is: the medium container 52, the heat exchanger 41, the heater 53 (on), the pump 51, the first temperature sensor 55, the first battery 61, the second temperature sensor 56, the flow rate sensor 57 and the medium container 52 are cycled, and the temperature rise of the first battery 61 of the battery is realized.
According to an embodiment of the invention, when in the cooling mode, the controller obtains a power difference between the temperature adjustment required power P1 and the temperature adjustment actual power P2 of a certain battery when the temperature adjustment required power P1 of the certain battery is greater than the temperature adjustment actual power P2 corresponding to the battery, and increases the power of the compressor 1 for cooling the battery according to the power difference, or adjusts and increases the flow rate of the cooling liquid of the battery cooling branch 4 corresponding to the battery 6 to increase the cooling power of the battery, and when the temperature adjustment required power P1 of the certain battery is less than or equal to the temperature adjustment actual power P2 corresponding to the battery, reduces the power of the compressor or keeps the power of the compressor unchanged, or adjusts and reduces the flow rate of the cooling liquid of the battery cooling branch 4 corresponding to the battery 6 to reduce the cooling power of the battery.
Specifically, when operating in the cooling mode, the controller acquires and makes a judgment on P1 and P2 of each battery 6, respectively. If the P1 of one of the batteries 6 is greater than the P2, it indicates that if the temperature of the battery 6 cannot be reduced within the target time according to the current cooling power or the current cooling liquid flow rate, therefore, the controller obtains the power difference between the P1 and the P2 of the battery, and increases the power of the compressor 1 for cooling the battery according to the power difference, or increases the cooling liquid flow rate of the battery cooling branch 4 where the battery is located, so as to increase the cooling power of the battery, wherein the larger the power difference between the P1 and the P2 is, the more the power of the corresponding compressor 1 and the cooling liquid flow rate of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If the P1 of one of the batteries 6 is less than or equal to P2, the power of the compressor 1 for cooling the battery can be kept unchanged or the power of the compressor 1 can be properly reduced, or the flow of the cooling liquid of the battery cooling branch 4 where the battery is located can be reduced, so that the cooling power of the battery can be reduced. When the temperature of all the batteries 6 is lower than 35 ℃, the cooling of the batteries 6 is completed, and the controller transmits information for turning off the temperature adjustment function to the vehicle air conditioner through CAN communication and controls all the second electronic valves 43 to be closed. If the temperature of the battery 6 is still higher than 35 c after the thermostat system has entered the cooling mode for a longer time, for example 1 hour, the controller increases the power of the corresponding compressor 1 or the rotational speed of the pump appropriately so that the battery is cooled down as soon as possible.
According to an embodiment of the present invention, when in the heating mode, the controller obtains a power difference between the temperature-adjustment required power P1 of the certain battery and the temperature-adjustment actual power P2 when the temperature-adjustment required power P1 of the certain battery is greater than the temperature-adjustment actual power P2, and increases the power of the heater 53 for heating the battery according to the power difference to increase the heating power of the battery, and decreases the power of the heater 53 or keeps the power of the heater 53 constant when the temperature-adjustment required power P1 of the certain battery is less than or equal to the temperature-adjustment actual power P2.
Specifically, when in the heating mode, the controller acquires P1 and P2 of each battery 6, respectively, and makes a judgment. If P1 of one of the batteries 6 is greater than P2, it means that if the temperature rise of the battery 6 cannot be completed within the target time according to the current heating power or coolant flow rate, so the controller obtains the power difference between P1 and P2 of the battery and increases the power of the heater 53 for heating the battery 6 according to the power difference, so that the battery can complete the temperature adjustment within the target time. Wherein the larger the difference between P1 and P2, the more the power of the heater 53 is increased. If the P1 of a certain battery is less than or equal to P2, the controller can reduce the power of the heater 53 appropriately to save power or keep the power of the heater 53 unchanged. When the temperature of all the batteries 6 is higher than a preset temperature, for example, 10 c, the heating of the batteries 6 is completed, and the controller controls the heater 53 to be turned off. If the temperature of the battery 6 remains below 10 c after the thermostat system has entered the heating mode for an extended period of time, such as 1 hour, the controller then increases the power to the heater 53 appropriately to allow the battery to finish warming as quickly as possible.
For example, as shown in fig. 11A, since the heating functions of the first battery 61 and the second battery 62 are independent from each other, and the first battery 61 and the second battery 62 are heated by one heater, the power regulation of the battery heating function will be described by taking only the first battery 61 as an example. (suppose that P11 is the temperature-regulation required power of the first battery 61, P21 is the temperature-regulation actual power of the first battery 61, and the power difference between P11 and P21 is P31)
If P11 > P21, the power to be adjusted is P31(P31 — P11-P21), the heating power of the heater 53 is increased by P31, and the rotation speed of the pump 51 is increased.
If P11 is less than or equal to P21, when the power to be regulated is P31(P31 is P11-P21), the power of the heater 53 is kept unchanged, or the power of the heater 53 is reduced by P31, or the rotating speed of the pump 51 is reduced.
According to an embodiment of the present invention, the controller is further configured to decrease the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is less than the corresponding temperature-regulation actual power P2, and increase the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is greater than the corresponding temperature-regulation actual power P2.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if P1 of a certain battery 6 is less than P2, the controller controls the rotation speed of the corresponding pump 51 to be reduced to save electric power. If the P1 of a certain battery 6 is larger than the P2, the controller controls the power of the corresponding heater 53 or compressor 1 to be increased or the flow rate of the cooling liquid in the loop where the battery is located to be increased, and controls the rotating speed of the pump 51 to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, and the temperature adjustment actual power P2 of the battery is increased, and the temperature adjustment is realized in the target time t.
According to an embodiment of the present invention, if there are a plurality of compressors 1 for supplying the refrigerant to the batteries, the controller is further configured to judge the number of compressors to be started based on the temperature regulation demand power P1 of each battery and the maximum cooling power P of each compressor, and to control the corresponding number of compressors 1 to be started when the temperature regulation system is in the cooling mode.
Further, the controller may generate a total temperature adjustment required power Pz according to the temperature adjustment required power P1 of each battery, and the controller controls the plurality of compressors 1 to be simultaneously started when judging that the total temperature adjustment required power Pz is greater than the maximum cooling power P of a single compressor.
Specifically, as shown in fig. 11A, taking the compressors 1 as two examples, when the temperature regulation system enters the cooling mode, the controller obtains P1 of each battery 6, the temperature regulation actual power P2 of each battery, and the maximum cooling power P of a single compressor, respectively, adds P1 of each battery to calculate the total temperature regulation required power Pz of the entire temperature regulation system, adds the temperature regulation actual power P2 of each battery to obtain the total temperature regulation actual power Pf, and adds the maximum cooling power of each compressor to calculate the sum P5 of the maximum cooling powers of all the compressors. The temperature regulation required power of the first battery 61 is P11, and the temperature regulation required power of the second battery 62 is P12. The temperature-regulated actual power of the first battery 61 is P21, and the temperature-regulated actual power of the second battery 62 is P22. The maximum refrigeration power P of each compressor is equal.
If Pz is less than or equal to P, only one compressor 1 needs to be controlled to work to provide the refrigeration power, and two compressors 1 can also be controlled to work together. If P < Pz ≦ P5, two compressors 1 are required to work together, and the initial cooling power of each compressor is Pz/2. And if the Pz is less than or equal to P5, controlling the compressor 1 to operate according to the Pz refrigerating power, and adjusting the opening degrees of the first regulating valve, the fourth regulating valve, the initial cooling power of the first battery cooling branch 401 is cooled according to the P11 refrigerating power, and the initial cooling power of the second battery cooling branch 402 is cooled according to the P21 refrigerating power. If Pz > P5, each compressor is operated at the maximum cooling power P, and the initial cooling power of the first battery cooling branch 401 may be cooled at the cooling power P5 × [ P11/(P11+ P12) ], and the initial cooling power of the second battery cooling branch 402 may be cooled at the cooling power P5 × [ P12/(P11+ P12) ].
According to an embodiment of the present invention, the controller is further configured to, in the cooling mode, increase the cooling power of the higher temperature batteries 6 so as to reduce the temperature difference between the batteries 6 when the temperature difference between the batteries 6 exceeds a set value; in the heating mode, when the temperature difference between the batteries exceeds a set value, the heating power of the battery 6 having a lower temperature is increased.
It is understood that when the temperature adjusting system is operated in the cooling mode, as shown in fig. 11A, the controller may calculate the temperature adjustment required powers P1 of the first and second batteries 61 and 62, respectively, and then adjust the opening degrees of the corresponding second expansion valves 42 according to the P1 of each battery and the maximum cooling power P of the compressor, respectively. During the cooling process, the controller adjusts the actual power P2 according to the temperature of each battery to continuously adjust the opening degree of the second expansion valve 42. Meanwhile, the controller adjusts the flow distribution of the cooling liquid of the first battery cooling branch 401 and the second battery cooling branch 402 by adjusting the opening degree of the first to fourth adjusting valves 411 and 414 according to the temperature condition between the first battery 61 and the second battery 62, thereby achieving the balance of controlling the temperature of the first battery 61 and the second battery 62. Wherein, when the temperature of the first battery 61 is higher than the temperature of the second battery 62 and the difference exceeds the set value, the opening degrees of the first and third regulating valves 411 and 413 may be increased, and the opening degrees of the second and fourth regulating valves 412 and 414 may be decreased to increase the cooling power of the first battery 61; when the temperatures of the first battery 61 and the second battery 62 are equal, if the supplied cooling powers of the two compressors 1 are equal, the opening degrees of the first to fourth regulating valves 411 and 414 can be controlled to be the same; and if the cooling powers supplied from the two compressors 1 are not equal, the first and second adjusting valves 411 and 412 may be controlled to be equally opened, and the third and fourth adjusting valves 413 and 414 may be controlled to be equally opened. When the temperature adjusting system is operated in the heating mode, the controller increases the heating power of the heater 53 corresponding to the first battery 61 when the temperature of the first battery 61 is lower than the temperature of the second battery 62 and the difference value exceeds the set value. Thereby, the temperature balance between the two batteries can be maintained. A temperature regulation system of an in-vehicle battery according to an embodiment of the present invention may also be shown in fig. 11B and 11C. In fig. 11B, a plurality of compressors (i.e., the first compressor 11 and the second compressor 12 in fig. 11B) are connected in parallel and share one expansion valve, and a regulating valve (i.e., a first regulating valve 411 and a second regulating valve 412) is added to each battery cooling branch, and the flow rate of the cooling liquid flowing into each battery cooling branch is regulated by the regulating valve to regulate the cooling power of each battery. Fig. 11C shows that a plurality of compressors (i.e., the first compressor 11 and the second compressor 12 in fig. 11C) are connected in parallel and share one condenser 2, a second expansion valve 42 and an electronic valve are provided in each battery cooling branch, the flow rate of the coolant flowing into each battery cooling branch is adjusted by adjusting the opening degree of the second expansion valve 42 to adjust the cooling power of each battery, and the opening and closing of each battery cooling branch is controlled by the electronic valve.
The temperature adjustment process of the system shown in fig. 11C is described below with reference to a specific embodiment.
As shown in fig. 11C, the battery may include a first battery and a second battery, Pz ═ P11+ P12, P11 is the temperature regulation required power of the first battery, P12 is the temperature regulation required power of the second battery, and Pz is the sum of the temperature regulation required powers of the first battery and the second battery (total temperature regulation required power Pz). Pf is P21+ P22, P21 is the temperature-regulated actual power of the battery, P22 is the temperature-regulated actual power of the battery, and Pf is the sum of the temperature-regulated actual powers of the first battery and the second battery. P is the maximum refrigeration capacity of the compressor, P5 is the sum of the maximum refrigeration capacities of all the compressors, and P5 is 2 × P.
Compressor power initial allocation:
if Pz is less than or equal to P, only one compressor is needed to work to provide refrigeration power, or two compressors work together; if P is more than Pz and less than or equal to P5, two compressors are required to work together, and the initial refrigerating power of each compressor is Pz/2; if Pz > P5, two compressors are required to work together, each compressor operating at maximum refrigeration capacity P.
When the Pz is less than or equal to P5, the compressor operates according to the Pz refrigeration power, and the initial cooling power of the cooling branch of the first battery 61 is cooled according to the P11 refrigeration power; the second battery 62 cooling branch initial cooling power is cooled in accordance with the P21 cooling power. When Pz > P5, each compressor is operated at the maximum cooling power P. The initial cooling power of the cooling branch of the first battery 61 is cooled according to the refrigeration power of P5 [ P11/(P11+ P12) ]; the cooling branch of the second battery 62 is initially cooled at a cooling power of P5 × P12/(P11+ P12).
In the process of cooling the battery, the cooling power of the battery needs to be adjusted, which specifically comprises the following steps:
when Pz > Pf, the power that needs to be regulated is Pc (Pc ═ Pz-Pf). If Pz + Pc is less than or equal to P5, the compressor needs increased refrigerating power Pc, and the following processes are carried out:
if P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the expansion valve of the circuit in which the first battery 61 is located is controlled to be increased, and the rotation speed of the pump of the circuit is controlled to be increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the expansion valve of the circuit in which the second battery 62 is located is controlled to be increased, the rotation speed of the pump of the circuit is controlled to be increased, and the cooling power of the second battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept constant, or the opening degree of the expansion valve 8 of the circuit in which the first battery 61 is located is controlled to decrease, and the rotation speed of the pump of the circuit is controlled to decrease, so that the cooling power of the first battery 61 decreases. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the expansion valve of the circuit in which the second battery 62 is located is controlled to decrease, and the rotation speed of the pump of the circuit is controlled to decrease, so that the cooling power of the second battery 62 decreases.
P5 if Pz + Pc > P5, each compressor operates according to the maximum refrigeration power P, and the rotation speed of the water pump is increased. The following processes are carried out simultaneously:
controlling the opening degree of an expansion valve of a cooling branch in which the first battery 61 is located, so that the cooling power of the cooling branch of the first battery 61 is cooled according to the cooling power of P5 × P11/(P11+ P12); and controlling the opening degree of the expansion valve of the cooling branch in which the second battery 62 is positioned, so that the cooling power of the cooling branch of the second battery 62 is cooled according to the cooling power of P5 × P12/(P11+ P12).
When Pz is equal to or less than Pf and the power to be adjusted is Pc (Pc-Pf-Pz), the following process is performed while maintaining the compressor cooling power or reducing the compressor cooling power. If P11 is not less than P21 and P11-P21 are Pc1, the opening degree of the expansion valve of the circuit in which the first battery 61 is located is controlled to be increased, and the rotation speed of the pump of the circuit is controlled to be increased, so that the cooling power of the first battery 61 is increased by Pc 1. If P12 is not less than P22 and P12-P22 are Pc2, the opening degree of the expansion valve of the circuit in which the second battery 62 is located is controlled to be increased, the rotating speed of the pump of the circuit is controlled to be increased, and the cooling power of the battery 62 is increased by Pc 2. If P11 < P21 and P21-P11 are Pc1, the cooling power of the first battery 61 is kept unchanged, or the opening degree of the expansion valve of the circuit in which the first battery 61 is located is controlled to decrease, and the rotation speed of the pump of the circuit is controlled to decrease, so that the cooling power of the first battery 61 decreases. If P12 < P22 and P22-P12 are Pc2, the cooling power of the second battery 62 is kept unchanged, or the opening degree of the expansion valve of the circuit in which the second battery 62 is located is controlled to decrease, and the rotation speed of the pump of the circuit is controlled to decrease, so that the cooling power of the second battery 62 decreases.
Adjusting heating power:
since the heating functions of the first battery 61 and the second battery 62 are independent of each other, the first battery 61 and the second battery 62 respectively use one heater to perform the required heating power of the first battery 61, P21 is the actual heating power of the second battery 61, the power difference is P31, if P11 is greater than P21, the power to be regulated is P31(P31 is P11-P21), the heating power of the heater is increased by P31, and the rotation speed of the pump is increased. If P11 is less than or equal to P21, when the power to be regulated is P31(P31 is P11-P21), the power of the heater is kept unchanged, or the heating power P31 is reduced, or the rotating speed of the pump is reduced.
And (3) battery temperature equalization:
in the battery cooling process, if the battery temperature difference between the temperature T61 of the first battery 61 and the temperature T62 of the second battery 62 exceeds 3 ℃, which is a preset value, i.e., if T61-T62 > 3 ℃, the battery thermal management controller controls the opening degree of the second expansion valve 42 in the cooling branch of the first battery 61 to increase, or simultaneously controls the rotation speed of the pump in the branch in which the first battery 61 is located to increase, controls the opening degree of the second expansion valve 42 in the cooling branch of the second battery 62 to decrease, or simultaneously controls the rotation speed of the pump in the branch in which the second battery 62 is located to decrease, so that the cooling power of the first battery 61 increases, and the cooling power of the second battery 62 decreases, thereby achieving temperature equalization of the first battery 61 and the second battery 62.
And if T62-T61 is more than 3 ℃, the battery thermal management controller controls the opening degree of the second expansion valve 42 in the cooling branch of the second battery 62 to increase, or simultaneously controls the rotating speed of the pump in the branch where the second battery 62 is positioned to increase, and controls the opening degree of the second expansion valve 42 in the cooling branch of the first battery 61 to decrease, or simultaneously controls the rotating speed of the pump in the branch where the first battery 61 is positioned to decrease, so that the cooling power of the second battery 62 is increased, and the cooling power of the first battery 61 is decreased, thereby realizing the temperature equalization of the first battery 61 and the second battery 62.
In the battery heating process, if the battery temperature difference between the first battery 61 and the second battery 62 exceeds 3 ℃, that is, if T61-T62 is greater than 3 ℃, the battery thermal management controller controls the heating power of the heater 53 in the heating loop of the first battery 61 to be reduced and the rotation speed of the pump 51 of the loop to be reduced, and controls the heating power of the heater 53 in the heating loop of the second battery 62 to be increased and the rotation speed of the pump of the loop to be increased, so that the heating power of the first battery 61 is increased and the heating power of the second battery 62 is reduced, thereby realizing the temperature equalization of the first battery 61 and the second battery 62. If T62-T61 > 3 ℃, the battery thermal management controller controls the heating power of the heater 53 in the heating circuit of the first battery 61 to increase and increases the rotation speed of the pump 51 of the circuit, and controls the heating power of the heater 53 in the heating circuit of the second battery 62 to decrease and decreases the rotation speed of the pump of the circuit, so that the heating power of the first battery 61 decreases and the heating power of the second battery 62 increases, thereby achieving the temperature equalization of the first battery 61 and the second battery 62.
It is understood that fig. 11B differs from fig. 11C in that fig. 11B is power-regulated by a regulating valve through the cooling power between the first battery cooling branch 401 where the first battery 61 is located and the second battery cooling branch 402 where the second battery 62 is located; the two battery cooling branches of fig. 11C are adjusted in cooling power of 2 cooling branches by an expansion valve. The specific adjustment process of fig. 11B can refer to the above embodiments, and is not described herein again.
According to the temperature adjusting system provided by the embodiment of the invention, the heating power and the cooling power of each battery can be accurately controlled according to the actual state of each battery, the temperature is adjusted when the temperature of each battery is too high or too low, the temperature of each battery is maintained in a preset range, the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided, and the battery temperature adjusting module can ensure the balance of the temperature among the batteries by adjusting the refrigerating capacity opening degree of the battery cooling branch corresponding to each battery due to the mutual communication among a plurality of battery cooling branches.
Fig. 12a is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to a sixth embodiment of the invention. The temperature regulation system of the vehicle-mounted battery comprises a plurality of compressors, a plurality of battery cooling branches corresponding to the compressors, a plurality of batteries and a plurality of battery temperature regulation modules connected between the batteries and the battery cooling branches. As shown in fig. 12a, the temperature adjustment method of the vehicle-mounted battery includes the steps of:
And S1', respectively obtaining the temperature regulation required power P1 of the plurality of batteries.
Further, according to an embodiment of the present invention, as shown in fig. 12b, the respectively obtaining temperature adjustment required powers P1 of the plurality of batteries specifically includes:
and S11', respectively obtaining a first parameter when the opening temperature of each battery is adjusted, and generating a first temperature adjustment required power of each battery according to the first parameter.
And S12', respectively acquiring a second parameter of each battery during temperature adjustment, and generating a second temperature adjustment required power of each battery according to the second parameter.
And S13', respectively generating the temperature regulation required power P1 of each battery according to the first temperature regulation required power of each battery and the second temperature regulation required power of each battery.
Further, according to an embodiment of the present invention, the first parameters are an initial temperature and a target temperature at which the battery is turned on and a target time t from the initial temperature to the target temperature, and the generating the first temperature adjustment required power of each battery according to the first parameters specifically includes: a first temperature difference Delta T between an initial temperature and a target temperature is obtained1. According to the first temperature difference Delta T 1And the target time t generates the first temperature regulation required power.
Still further, according to an embodiment of the present invention, the first temperature regulation required power is generated by the following formula (1):
ΔT1*C*M/t, (1)
wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
According to an embodiment of the present invention, the second parameter is an average current I of each battery over a preset time, and the second temperature adjustment required power of each battery is generated by the following formula (2):
I2*R, (2)
wherein I is the average current and R is the internal resistance of the battery.
Wherein when cooling the battery, P1 is delta T1*C*M/t+I2R; when the battery is heated, P1 ═ Δ T1*C*M/t-I2*R。
And S2', respectively obtaining the temperature adjustment actual power P2 of the plurality of batteries.
According to an embodiment of the present invention, as shown in fig. 12b, the obtaining the temperature-regulated actual power P2 of the plurality of batteries respectively specifically includes:
s21 ", the inlet temperature and the outlet temperature of the flow path for adjusting the temperature of each cell are acquired, and the flow velocity v of the coolant flowing into the flow path is acquired.
S22 ″, a second temperature difference Δ T is generated from the inlet temperature and the outlet temperature of the flow path of each cell 2
S23 ", according to the second temperature difference Δ T of each battery2And the flow rate v generates a temperature-adjusted actual power per cell P2.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is further generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the area of the flow path.
And S3', controlling the corresponding battery temperature adjusting module of each battery according to the temperature adjusting required power P1 and the temperature adjusting actual power P2 to adjust the temperature of the battery. The battery cooling branches are communicated with each other, and the refrigerating capacity opening degree provided by the plurality of compressors to the battery cooling branch corresponding to the battery is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the battery.
In the embodiment of the present invention, controlling the corresponding battery temperature adjustment module of each battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 to adjust the temperature of the battery specifically includes: and controlling the corresponding battery temperature adjusting module of each battery within the target time t according to the temperature adjusting required power P1 and the temperature adjusting actual power P2 to adjust the temperature of the battery to reach the target temperature.
According to the temperature regulation demand power P1 and the temperature regulation actual power P2 of battery, the refrigerating capacity opening degree that a plurality of compressors provided to the battery cooling branch circuit that the battery corresponds is adjusted, specifically including: judging whether the temperature regulation required power P1 of each battery is larger than the temperature regulation actual power P2 of the battery; if the temperature regulation required power P1 of the battery is larger than the temperature regulation actual power P2 of the battery, the refrigerating power of a plurality of compressors or a single compressor is increased, or the opening degree of the refrigerating capacity provided for the battery cooling branch corresponding to the battery is increased.
Specifically, after the vehicle is powered on, whether the battery needs to be temperature-regulated is judged, if the battery needs to be temperature-regulated, the initial temperature (namely the current temperature), the target temperature and the target time t from the initial temperature to the target temperature of each battery are respectively obtained, wherein the target temperature and the target time t can be preset according to actual conditions, and the first temperature regulation required power is respectively calculated according to a formula (1). Meanwhile, the average current I of each battery in the preset time is respectively obtained, and the second temperature regulation required power of each battery is respectively calculated according to the formula (2). Then, the temperature regulation required power P1 (required power for regulating the temperature of the battery to the target temperature) of each battery is calculated based on the first temperature regulation required power and the second temperature regulation required power of each battery, respectively. Further, the inlet temperature and the outlet temperature of each cell are acquired, the flow rate information is acquired, and the temperature-regulated actual power P2 of each cell is calculated according to the formula (3). Then, the required power and P1 and the actual power P2 may be adjusted according to the temperature of the corresponding battery, and the cooling power/heating power of the battery may be adjusted by adjusting the flow rate of the cooling liquid flowing into the corresponding battery cooling branch or the corresponding heater power, so that it may be ensured that the temperature of the battery is adjusted according to the actual state of each battery for the target time t. Meanwhile, because the battery cooling branches are communicated with each other, the balance of the temperature among the batteries can be ensured by adjusting the refrigerating capacity opening degree of the battery cooling branch corresponding to the battery according to the temperature of each battery. Therefore, the temperature can be adjusted within the target time when the temperature of the vehicle-mounted battery is too high or too low, so that the temperature of the vehicle-mounted battery is maintained within the preset range, and the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided.
How to control the corresponding battery temperature adjustment module of each battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 to adjust the temperature of the battery will be described below with reference to specific embodiments.
According to an embodiment of the present invention, as shown in fig. 12b, the temperature adjustment method of the vehicle-mounted battery may further include:
s31', generating a total temperature regulation required power P1 according to the temperature regulation required power P of each batteryZ
And S32', generating the total maximum refrigerating power P5 of the plurality of compressors according to the maximum refrigerating power P of the plurality of compressors.
S33', judging the total temperature regulation demand power PZWhether it is greater than the total maximum cooling power P5 of the plurality of compressors.
S34' if the total temperature is adjusted, the required power P is adjustedZAnd if the total maximum refrigerating power P5 of the compressors is greater than the maximum refrigerating power P5 of the compressors, the opening degree of the refrigerating capacity of the battery cooling branch corresponding to the batteries of the compressors is adjusted to be maximum.
S35' if the total temperature is adjusted, the required power P is adjustedZLess than or equal to the total maximum refrigerating power P5 of the compressors, and regulating the required power P according to the total temperatureZBattery cooling corresponding to the difference of the total maximum cooling power P5And adjusting the refrigerating capacity opening degree of the branch.
Specifically, the total temperature regulation required power P of the entire temperature regulation system may be calculated from the temperature regulation required power P1 of each batteryZThat is, the total temperature regulation required power P is obtained by adding the temperature regulation required power P1 of each batteryZMeanwhile, the total maximum refrigerating power P5 of the plurality of compressors is calculated according to the maximum refrigerating power P of each compressor, namely the total maximum refrigerating power P5 can be obtained by adding the maximum refrigerating power P of each compressor. Then, it is judged whether P is presentZAnd if so, controlling to adjust the opening degree of each second expansion valve to be maximum so as to adjust the flow of the cooling liquid of the plurality of compressors to the battery cooling branch corresponding to the battery to be maximum, so that the battery can be cooled within the target time t. And if PZP5 or less, according to PZThe difference between P5, where P is the opening degree of the second expansion valveZThe larger the absolute value of the difference value with the P5 is, the smaller the opening degree of the second expansion valve is, so as to achieve the purpose of saving energy.
According to an embodiment of the present invention, as shown in fig. 13, the temperature adjustment method of the battery may further include the steps of:
the temperature of the battery is detected, and it is determined whether the temperature is greater than the first temperature threshold or less than the second temperature threshold (S10 "-S20"). When the temperature of the battery is greater than the first temperature threshold, the cooling mode is entered (S30 "). The first preset temperature threshold may be preset according to actual conditions, and may be, for example, 40 ℃. When the temperature of the battery is less than or equal to the first temperature threshold, whether the temperature of the battery is less than a second temperature threshold is further judged, and when the temperature of the battery is less than the second temperature threshold, a heating mode is entered (S40 '-S50'). The second preset temperature threshold may be preset according to an actual situation, and may be 0 ℃.
Specifically, after the vehicle is powered on, the temperature of each battery is detected in real time and is judged. If the temperature of one of the batteries is higher than 40 ℃, the temperature of the battery is over high at the moment, and in order to avoid the influence of the high temperature on the performance of the battery, the battery needs to be cooled, enters a cooling mode, and sends a battery cooling function starting message to an air conditioning system. If the temperature of a certain battery is lower than 0 ℃, the temperature of the battery is too low at the moment, so that the battery needs to be subjected to temperature rise treatment to avoid the influence of low temperature on the performance of the battery, and the battery enters a heating mode, a corresponding battery cooling branch is controlled to be closed, and a heater is controlled to be opened to provide heating power for the battery.
According to an embodiment of the present invention, as shown in fig. 13, when the cooling mode is performed, the controlling the corresponding battery temperature adjustment module of each battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 to adjust the temperature of the battery specifically includes:
and S36', judging whether the temperature regulation required power P1 of each battery is larger than the temperature regulation actual power P2 corresponding to each battery.
And S37', if the temperature regulation required power P1 of a certain battery is larger than the temperature regulation actual power P2 corresponding to the battery, acquiring the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increasing the power of a compressor for cooling the battery according to the power difference, or adjusting and increasing the flow of cooling liquid of a battery cooling branch corresponding to the battery to increase the cooling power of the battery.
And S38', if the temperature regulation required power P1 of a certain battery is less than or equal to the temperature regulation actual power P2 corresponding to the battery, reducing the power of the compressor or keeping the power of the compressor unchanged, or regulating and reducing the flow of the cooling liquid of the battery cooling branch corresponding to the battery to reduce the cooling power of the battery.
Specifically, when operating in the cooling mode, P1 and P2 of each battery are acquired, respectively, and judged. If the power P1 of one of the batteries is greater than the power P2, it is stated that if the temperature of the battery cannot be reduced within the target time according to the current refrigeration power or the current coolant flow, therefore, the power difference between the power P1 and the power P2 of the battery is obtained, and the power of a compressor for cooling the battery is increased according to the power difference, or the coolant flow of a battery cooling branch where the battery is located is increased to increase the cooling power of the battery, wherein the larger the power difference between the power P1 and the power P2 is, the more the power of the corresponding compressor and the coolant flow of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If the P1 of one of the batteries is less than or equal to P2, the power of the compressor for cooling the battery can be kept unchanged or reduced appropriately, or the flow of the cooling liquid of the battery cooling branch where the battery is located can be reduced, so that the cooling power of the battery can be reduced. When the temperature of all the batteries is lower than 35 ℃, the batteries are cooled, the information for closing the temperature adjusting function is sent to the vehicle-mounted air conditioner through CAN communication, and the second electronic valve is controlled to be closed. If the temperature of the battery is still higher than 35 ℃ after the temperature regulating system enters the cooling mode for a long time, for example, after 1 hour, the power of the corresponding compressor is appropriately increased so that the temperature of the battery is reduced as soon as possible.
According to an embodiment of the present invention, as shown in fig. 13, when the heating mode is used, the controlling the corresponding battery temperature adjusting module of each battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 to adjust the temperature of the battery specifically includes:
and S39', judging whether the temperature regulation requirement P1 power of each battery is larger than the temperature regulation actual power P2 corresponding to each battery.
And S310', if the temperature regulation required power P1 of a certain battery is greater than the temperature regulation actual power P2 corresponding to the battery, acquiring the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increasing the power of a heater according to the power difference so as to increase the heating power of the battery.
And S311', if the temperature regulation required power P1 of a certain battery is less than or equal to the temperature regulation actual power P2 corresponding to the battery, reducing the power of the heater, or keeping the power of the heater unchanged.
Specifically, when in the heating mode, P1 and P2 of each battery are acquired, respectively, and judged. If P1 of one of the batteries is larger than P2, it indicates that the temperature rise of the battery cannot be completed within the target time according to the current heating power or the current cooling liquid flow, so the power difference between P1 and P2 of the battery is obtained, and the power of the heater for heating the battery is increased according to the power difference, so that the battery can complete the temperature regulation within the target time. If the P1 of a certain battery is less than or equal to P2, the power of the heater can be reduced appropriately to save electric energy, or the power of the heater can be kept unchanged. When the temperature of all the batteries is higher than a preset temperature, for example, 10 ℃, the heating of the batteries is completed, information for turning off the temperature adjusting function is sent to the vehicle-mounted air conditioner through the CAN communication, and the heaters are controlled to be turned off. If the temperature of the battery is still lower than 10 ℃ after the temperature regulating system enters the heating mode for a long time, for example, after 1 hour, the power of the heater is properly increased so that the temperature of the battery is raised as soon as possible.
For example, as shown in fig. 11A, since the heating functions of the first battery and the second battery are independent from each other, and the first battery and the second battery are heated by one heater, the power regulation of the battery heating function will be described only by taking the first battery as an example. (suppose P11 is the temperature-regulated power demand of the first battery, P21 is the temperature-regulated actual power of the first battery, and the power difference between P11 and P21 is P31)
If P11 is more than P21, when the power to be regulated is P31(P31 is P11-P21), the heating power of the heater is increased by P31, and the rotating speed of the pump is increased.
If P11 is less than or equal to P21, when the power needing to be adjusted is P31(P31 is P11-P21), the power of the heater is kept unchanged, or the power of the heater is reduced by P31, or the rotating speed of the pump is reduced.
According to an embodiment of the present invention, the temperature adjustment method of the vehicle-mounted battery may further include: if the temperature regulation required power P1 of a certain battery is smaller than the corresponding temperature regulation actual power P2, reducing the rotating speed of the pump; if the temperature regulation required power P1 of a certain battery is larger than the corresponding temperature regulation actual power P2, the rotation speed of the pump is increased.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if P1 of a certain battery is less than P2, the rotation speed of the pump is controlled to be reduced to save electric power. And if the P1 of a certain battery is larger than the P2, besides controlling the power of the heater and the compressor to be increased or controlling the flow rate of the cooling liquid in the loop where the battery is positioned to be increased, the rotating speed of the pump can be controlled to be increased so as to increase the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time, and therefore the temperature of the battery is adjusted to be actually adjusted to be P2, and temperature adjustment is achieved within the target time t.
According to an embodiment of the present invention, the compressor for supplying the refrigerant to the battery is plural, and the temperature adjusting method of the battery may further include: the number of compressors to be started is judged according to the temperature regulation demand power P1 of each battery and the maximum cooling power of each compressor. When the cooling mode is adopted, a corresponding number of compressors are controlled to start.
Further, the step of judging the number of started compressors according to the temperature regulation demand power P1 of each battery and the maximum cooling power P of each compressor specifically includes: generating total temperature regulation actual power Pz according to the temperature regulation required power P1 of each battery; judging whether the total temperature regulation required power Pz is larger than the maximum refrigerating power P of a single compressor or not; and if the maximum refrigerating power P of the single compressor is larger than the maximum refrigerating power P of the single compressor, controlling the plurality of compressors to start simultaneously.
Specifically, when the temperature regulation system enters the cooling mode, P1 of each battery is acquired respectively, and P1 of each battery is added to calculate the total temperature regulation required power P of the whole temperature regulation systemZ. And if the Pz is greater than the maximum refrigerating power of the single compressor, controlling the plurality of compressors to start working simultaneously, and adjusting the flow of the cooling liquid flowing into each battery cooling branch by adjusting the opening degree of the corresponding adjusting valve so as to meet the cooling and refrigerating power requirements of the corresponding battery.
Specifically, as shown in fig. 11A, taking the compressor 1 as an example, when the temperature regulation system enters the cooling mode, the controller obtains P1 of each battery, the actual temperature regulation power P2 of each battery, and the maximum cooling power P of a single compressor, respectively, and adds P1 of each battery to calculate the total temperature regulation required power P of the entire temperature regulation systemZAdjusting the temperature of each battery to actual power P2The total temperature-regulated actual capacity Pf is obtained by addition, and the sum P5 of the maximum refrigeration capacities of all the compressors can be calculated by adding the maximum refrigeration capacities of each compressor. The temperature regulation required power of the first battery is P11, and the temperature regulation required power of the second battery is P12. The temperature-regulated actual power of the first battery is P21, and the temperature-regulated actual power of the second battery is P22. The maximum refrigeration power P of each compressor is equal.
If Pz is less than or equal to P, only one compressor is controlled to work to provide refrigerating power, and two compressors can also be controlled to work together. If P < Pz ≦ P5, two compressors are required to work together, and the initial refrigeration power of each compressor is Pz/2. And if the Pz is less than or equal to P5, controlling the compressor to operate according to the Pz refrigerating power, and adjusting the opening degrees of the first regulating valve, the fourth regulating valve and the fourth regulating valve to ensure that the initial cooling power of the first battery cooling branch is cooled according to the P11 refrigerating power and the initial cooling power of the second battery cooling branch is cooled according to the P21 refrigerating power. If Pz > P5, each compressor is operated at the maximum refrigeration power P, and the initial cooling power of the first battery cooling branch can be cooled at the refrigeration power of P5 × P11/(P11+ P12), and the initial cooling power of the second battery cooling branch can be cooled at the refrigeration power of P5 × P12/(P11+ P12).
According to an embodiment of the present invention, in the cooling mode, when the temperature difference between the batteries exceeds a set value, the cooling power of the higher-temperature batteries is increased so as to reduce the temperature difference between the batteries; when the temperature difference between the batteries exceeds a set value in the heating mode, the heating power of the battery with the lower temperature is increased.
It is understood that, when the cooling mode is adopted, the temperature adjustment required powers P1 of the first battery and the second battery may be respectively calculated, and then the opening degree of the corresponding second expansion valve may be respectively adjusted according to the P1 of each battery and the maximum cooling power P of the corresponding compressor. And the adjustment of the opening degree of the second expansion valve 42 is continued according to the temperature adjustment actual power P2 of each battery, respectively. Meanwhile, according to the temperature condition between the first battery and the second battery, the flow distribution of the cooling liquid of the first battery cooling branch and the second battery cooling branch is adjusted by adjusting the opening degrees of the first adjusting valve, the fourth adjusting valve and the third adjusting valve, so that the balance of controlling the temperature of the first battery and the temperature of the second battery is achieved. When the temperature of the first battery is higher than that of the second battery and the difference value exceeds a set value, the opening degrees of the first regulating valve and the third regulating valve can be increased, and the opening degrees of the second regulating valve and the fourth regulating valve can be decreased to increase the cooling power of the first battery; when the temperatures of the first battery and the second battery are equal, the opening degrees of the first to fourth regulating valves may be controlled to be the same. And when the battery is in a heating mode, when the temperature of the first battery is lower than that of the second battery and the difference value exceeds a set value, the heating power of the heater corresponding to the first battery is increased. Thereby, the temperature balance between the two batteries can be maintained.
According to the temperature adjusting method of the vehicle-mounted battery, the heating power and the cooling power of each battery can be accurately controlled according to the actual state of each battery, the temperature is adjusted when the temperature of the battery is too high or too low, the temperature of the battery is maintained in a preset range, and the balance of the temperature among the batteries can be ensured.
The temperature regulation of the vehicle includes temperature regulation of the battery and temperature regulation in the vehicle compartment. In order to meet the requirement for the temperature in the vehicle under the condition that the temperature of the battery meets the requirement, the flow rates of the cooling liquids of the battery cooling branch and the cooling branch in the vehicle need to be reasonably distributed. To this end, the embodiment of the invention provides a temperature adjusting system of a vehicle. A temperature adjustment method and a temperature adjustment system of a vehicle according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
FIG. 2 is a block schematic diagram of a vehicle thermostat system according to one embodiment of the invention. As shown in fig. 2, the temperature adjusting system includes: the system comprises a compressor 1, a condenser 2, an in-vehicle cooling branch 3, a battery cooling branch 4 and a battery temperature adjusting module 5.
The condenser 2 is connected with the compressor 1, the in-vehicle cooling branch 3 is connected between the compressor 1 and the condenser 2, and the battery cooling branch 4 is connected between the compressor 1 and the condenser 2. The battery temperature adjusting module 5 is connected to the battery cooling branch 4, and is configured to obtain a temperature adjustment required power P1 and a temperature adjustment actual power P2 of the battery 6, obtain an in-vehicle temperature T and an air conditioner set temperature Ts of the vehicle, and adjust the opening degrees of the in-vehicle cooling branch 3 and the battery cooling branch 4 according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the in-vehicle temperature T, and the air conditioner set temperature Ts.
Specifically, the battery temperature adjusting module 5 obtains the temperature adjustment required power P1 of the battery 6, the temperature adjustment actual power P2 of the battery 6, the in-vehicle temperature T of the vehicle, and the air conditioner set temperature Ts, and adjusts the opening degrees of the in-vehicle cooling branch 3 and the battery cooling branch 4 according to P1, P2, T, and Ts to distribute the cooling capacity. As shown in fig. 2, when the cooling function of the vehicle air conditioner is turned on, the flowing direction of the cooling liquid is: compressor 1-condenser 2-in-vehicle cooling branch 3-compressor 1. Two pipelines are arranged in the battery cooling branch 4, a first pipeline is communicated with the compressor 1, a second pipeline is communicated with the battery temperature adjusting module 5, and the first pipeline and the second pipeline are mutually independent and arranged in a close mode. When the temperature of the battery is too high, the cooling function of the battery is started, and the flowing directions of the cooling liquid in the first pipeline and the second pipeline are respectively as follows: compressor 1-condenser 2-battery cooling branch 4-compressor 1; the battery cooling branch 4, the battery temperature adjusting module 5, the battery 6, the battery temperature adjusting module 5 and the battery cooling branch 4. And when the temperature of the battery 6 is too low, the battery temperature adjusting module 5 starts the battery heating function, and the flowing direction of the cooling liquid in the second pipeline is as follows: the battery cooling branch 4, the battery temperature adjusting module 5, the battery 6, the battery temperature adjusting module 5 and the battery cooling branch 4.
It can be understood that the refrigeration power of the battery temperature regulation module 5 is provided by the vehicle-mounted air conditioner and shares the refrigeration capacity with the refrigeration system in the vehicle, so that the volume of the temperature regulation system can be reduced, and the distribution of the flow of the cooling liquid is more flexible. Therefore, the system adjusts the opening degrees of the in-vehicle cooling branch and the battery cooling branch, can quickly adjust the temperature when the temperature of the vehicle-mounted battery is too high or too low, maintains the temperature of the vehicle-mounted battery within a preset range, avoids the condition that the temperature influences the performance of the vehicle-mounted battery, and can meet the requirement for the in-vehicle temperature under the condition that the temperature of the battery meets the requirement.
According to an embodiment of the present invention, the battery temperature adjusting module 5 is specifically configured to: and adjusting the opening degrees of the in-vehicle cooling branch 3 and the battery cooling branch 4 according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the in-vehicle temperature T and the air conditioner set temperature Ts so that the battery 6 reaches the target temperature within the target time T.
Specifically, the battery temperature adjusting module 5 can ensure that the heating power and the cooling power of the vehicle-mounted battery are accurately controlled according to the actual state of the battery 6 within the target time T when the opening degrees of the in-vehicle cooling branch 3 and the battery cooling branch 4 are adjusted according to P1, P2, T and Ts, so as to adjust the temperature when the temperature of the vehicle-mounted battery is too high or too low, and make the in-vehicle temperature meet the requirement when the temperature of the battery meets the requirement.
Further, according to an embodiment of the present invention, as shown in fig. 3, the battery cooling branch 4 includes a heat exchanger 41, and the heat exchanger 41 includes a first pipe and a second pipe, the second pipe is connected to the battery temperature adjusting module 5, the first pipe is communicated with the compressor 1, wherein the first pipe and the second pipe are independently disposed adjacent to each other. The battery temperature adjustment module 5 includes: a flow path (not specifically shown) that regulates the temperature of the battery is provided in the battery 6. A pump 51, a medium container 52, a heater 53, and a controller (not specifically shown in the drawings) connected between the flow path and the heat exchanger 41. The controller obtains the required power P1 for temperature adjustment of the battery 6 and the actual power P2 for temperature adjustment of the battery, adjusts the temperature of the battery 6 according to the required power P1 for temperature adjustment and the actual power P2 for temperature adjustment, and adjusts the opening degrees of the cooling branch 3 and the cooling branch 4 of the battery according to the required power P1 for temperature adjustment, the actual power P2 for temperature adjustment, the temperature T in the vehicle and the set temperature Ts of the air conditioner, so that the temperature in the vehicle can meet the requirements under the condition that the temperature of the battery meets the requirements. The in-vehicle cooling branch 3 may include: an evaporator 31, a first expansion valve 32, and a first electronic valve 33. The battery cooling branch 4 may further include a second expansion valve 42 and a second electronic valve 43.
How to obtain the temperature regulation required power P1 and the temperature regulation actual power P2 of the battery 6 can refer to the above embodiments, and details thereof are omitted herein to avoid redundancy.
How the battery temperature adjusting module 5 adjusts the opening degrees of the in-vehicle cooling branch 3 and the battery cooling branch 4 according to P1, P2, T and Ts to meet the in-vehicle temperature requirement when the temperature of the battery meets the requirement is described below with reference to specific embodiments.
According to an embodiment of the present invention, when the cooling mode is selected, the controller may decrease the opening degree of the in-vehicle cooling branch 4 and increase the opening degree of the battery cooling branch 4 when the temperature-adjustment required power P1 is greater than the temperature-adjustment actual power P2 and the battery temperature is greater than the third temperature threshold T3. Wherein the third temperature threshold is greater than the first temperature threshold, for example, the third temperature threshold may be 45 ℃.
Specifically, after the vehicle is powered on, if the temperature of the battery 6 is higher than 40 ℃, the controller controls the temperature adjustment system to enter a cooling mode to cool the battery 6. During the cooling of the battery 6, the controller acquires P1 and P2, and when it is judged that the temperature adjustment required power P1 is greater than the temperature adjustment actual power P2, it is further judged whether the battery temperature is greater than 45 ℃. If the temperature of the battery is higher than 45 ℃, which indicates that the temperature of the battery is too high, the vehicle-mounted air conditioner preferentially meets the cooling requirement of the battery 6, and the controller controls to reduce the opening degree of the first expansion valve 32 and increase the opening degree of the second expansion valve 42 so as to reduce the flow rate of the cooling liquid in the cooling branch 3 in the vehicle and increase the flow rate of the cooling liquid in the cooling branch 4 of the battery, so that the temperature of the battery 6 is reduced as soon as possible. When the temperature of the battery is reduced to 35 ℃, the cooling of the battery 6 is completed, and the controller controls the battery cooling branch 4 to be closed. Therefore, the temperature in the vehicle can meet the requirement under the condition that the temperature of the battery meets the requirement.
According to an embodiment of the present invention, the controller may be further configured to increase the opening degree of the in-vehicle cooling branch 4 and decrease the opening degree of the battery cooling branch 3 when the battery temperature is less than the third temperature threshold and the in-vehicle temperature T is greater than the air-conditioning set temperature Ts.
Specifically, when the controller determines that the battery temperature is less than 45 ℃ during the cooling of the battery 6, the controller further determines whether the in-vehicle temperature T is greater than the air conditioner set temperature Ts. If T is more than Ts, the temperature T in the vehicle does not reach the set temperature, the temperature in the vehicle is higher, and in order to prevent the user from feeling discomfort and preferentially meet the cooling requirement in the vehicle, the controller increases the opening degree of the first expansion valve 32 and decreases the opening degree of the second expansion valve 42. And if the in-vehicle temperature T reaches the air-conditioning set temperature Ts and the in-vehicle cooling power is sufficient and reaches a balance, the controller increases the opening degree of the second expansion valve 42 to increase the cooling power of the battery 6. When the battery temperature is lowered to 35 c, the cooling of the battery 6 is completed, and the controller controls the second electronic valve 33 to be closed. Therefore, the temperature in the vehicle can meet the requirement under the condition that the temperature of the battery meets the requirement.
That is, the battery temperature is hierarchically processed here, and the threshold values of the temperature control are 40 ℃, 45 ℃ and 35 ℃, respectively. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is lowered to 35 ℃, the cooling of the battery 6 is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature-regulation required power P1 is greater than the temperature-regulation actual power P2, if the battery temperature does not exceed 45 ℃, the cooling demand in the vehicle is still prioritized, and if the cooling power in the vehicle is already sufficient and reaches a balance, the controller increases the opening degree of the battery cooling branch 4 to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
According to an embodiment of the present invention, when being the heating mode, the controller obtains the power difference between the temperature adjustment required power P1 and the temperature adjustment actual power P2 when the temperature adjustment required power P1 is greater than the temperature adjustment actual power P2, and increases the power of the heater 53 for heating the battery 6 according to the power difference, and keeps the power of the heater 53 unchanged when the temperature adjustment required power P1 is less than or equal to the temperature adjustment actual power P2.
Specifically, the vehicle may include a single battery 6, or may be composed of a plurality of batteries 6 connected in series, parallel, or series-parallel. As shown in fig. 14A-14B, taking the battery as 2 as an example, when the battery is 2 (the first battery 61 and the second battery 62) and is connected in series, the number of the pumps is 2, and one of the two pumps is the forward pump 511 and the other is the reverse pump 512.
As shown in fig. 14A, when the forward pump 511 is started, the flow direction of the coolant in the second pipe is: medium container 52-heat exchanger 41-heater 53-forward pump 511-first temperature sensor 55-first battery 61-second battery 62-second temperature sensor 56-flow rate sensor 57-medium container 52. As shown in fig. 14B, when the reverse pump 512 is activated, the flow direction of the cooling liquid in the second pipe is: medium container 52-flow rate sensor 57-second temperature sensor 56-second battery 62-first battery 61-first temperature sensor 55-reversing pump 512-heater 53-heat exchanger 41-medium container 52.
For example, when the cooling function of the first and second batteries 61 and 62 is turned on, the controller separately obtains P1 of each battery, the temperature-adjusting actual power P2 of each battery, and the maximum refrigerating power P of the single compressor when the temperature adjustment system enters the cooling mode, and adds P1 of each battery to calculate the total temperature-adjusting required power P of the entire temperature adjustment systemZThe temperature-adjusted actual powers P2 of the respective cells are added to obtain a total temperature-adjusted actual power Pf. The temperature regulation required power of the first battery is P11, and the temperature regulation required power of the second battery is P12. The temperature-regulated actual power of the first battery is P21, and the temperature-regulated actual power of the second battery is P22. The maximum refrigeration power P of the compressor.
Regulating the required power P if the total temperature is adjustedZThe sum of the power P4 and the required power P in the vehicle interior is less than or equal to the maximum refrigerating power P of the compressor, namely Pz + P4 is less than or equal to P, and the compressor is operated according to PZ+ P4 refrigeration power operation. And Pz < P, P4 < P.
If Pz + P4 is more than P, whether the temperature of the first battery 61 or the second battery 62 is more than 45 ℃ is judged, if so, cooling power is preferentially provided for battery cooling, the controller controls the compressor 1 to operate according to the maximum cooling power P, the cooling power of the battery cooling branch 4 is Pz, and the cooling power of the in-vehicle cooling branch 3 is equal to P-Pz.
If the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, cooling power is preferentially provided for the vehicle, the compressor 1 operates according to the maximum refrigerating power P, the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch in the battery is equal to P-P4.
If the temperature in the vehicle has reached the set temperature, the cooling power of the battery is preferentially satisfied. The cooling power of the battery cooling branch is Pz.
The sum of the actual power is adjusted to Pf by the temperature of the first battery 61 and the second battery 62, and when Pz > Pf, the power to be adjusted is Pc (Pc — Pz-Pf). If Pz + P4+ Pc is less than or equal to P, the compressor requires an increased cooling power of Pc, the opening degree of the second expansion valve 42 is increased, and the rotation speed of the pump 51 is increased. The following processes are carried out simultaneously:
if P11-P21 is Pc1, P12-P22 is Pc2, P11 is more than P21, P12 is more than P22:
when Pc1 is greater than the set value, the forward pump 511 is controlled to be turned on and the reverse pump 512 is controlled to be turned off, so that the cooling power of the first battery 61 is increased. When Pc2 is greater than the set value, the reverse pump 512 is controlled to be turned on and the forward pump 511 is controlled to be turned off, so that the cooling power of the second battery 62 is increased. When Pc1 > Pc2, the forward pump 511 is controlled to be turned on and the reverse pump 512 is controlled to be turned off, so that the cooling power of the first battery 61 is increased. When Pc1 is less than or equal to Pc2, the reverse pump 512 is controlled to be started, and the forward pump 511 is controlled to be stopped, so that the cooling power of the second battery 62 is increased.
And, when the temperature T61 of the first battery 61 is greater than the temperature T62 of the second battery 62, the forward pump 511 is controlled to be turned on and the reverse pump 512 is controlled to be turned off, so that the cooling power of the first battery 61 is increased. When the temperature T61 of the first battery 61 is equal to or lower than the temperature T62 of the second battery 62, the reverse pump 512 is controlled to be turned on, and the forward pump 511 is turned off, so that the cooling power of the batteries 62 is increased.
If P21-P11 is Pc1, P22-P12 is Pc2, P11 is less than or equal to P21, and P12 is less than or equal to P22, the following steps can be carried out:
when Pc1 is greater than the set value, the forward pump 511 is controlled to be turned off and the reverse pump 512 is controlled to be turned on, so that the cooling power of the first battery 61 is reduced. When Pc2 is greater than the set value, the reverse pump 512 is controlled to be turned off and the forward pump 511 is controlled to be turned on, so that the cooling power of the second battery 62 is reduced. When Pc1 > Pc2, the forward pump 511 is controlled to be turned off and the reverse pump 512 is controlled to be turned on, so that the cooling power of the first battery 61 is reduced. When Pc1 is less than or equal to Pc2, the reverse pump 512 is controlled to be closed, and the forward pump 511 is controlled to be opened, so that the cooling power of the second battery 62 is reduced.
And, when the temperature T61 of the first battery 61 is greater than the temperature T62 of the second battery 62, the forward pump 511 is controlled to be turned on and the reverse pump 512 is controlled to be turned off, so that the cooling power of the first battery 61 is increased. When the temperature T61 of the first battery 61 is equal to or lower than the temperature T62 of the second battery 62, the reverse pump 512 is controlled to be turned on, and the forward pump 511 is turned off, so that the cooling power of the batteries 62 is increased. In addition, when the cooling function of the first battery 61 and the second battery 62 is started, if the temperature of the first battery 61 is higher than that of the second battery 62 and the difference value exceeds a preset value, the controller may control the forward pump 511 to operate, so that the cooling liquid flows through the first battery 61 and then flows through the second battery 62, and the first battery 61 is cooled as soon as possible. If the temperature of the second battery 62 is higher than that of the first battery 61 and the difference exceeds the preset value, the controller controls the reverse pump 512 to operate, so that the cooling liquid flows through the second battery 62 and then flows through the first battery 61, and the second battery 62 is cooled as soon as possible. Thus, by changing the flow direction of the coolant, the temperature difference between the first battery 61 and the second battery 62 can be reduced.
And when neither the cooling function nor the heating function of the first and second batteries 61 and 62 is activated, if the temperature difference between the first and second batteries 61 and 62 exceeds a preset value, the controller may control the forward pump 511 or the reverse pump 512 to be activated to flow the coolant in the battery cooling branch 4, thereby equalizing the temperatures of the first and second batteries 61 and 62.
When the pump 51 rotates forwards and the maximum value of the temperature difference between the batteries acquired by the battery management controller exceeds a preset value, the battery management controller sends information for controlling the pump to rotate backwards to the battery thermal management controller, so that the battery thermal management controller controls the pump to rotate backwards (the flow direction of the loop is in a counterclockwise direction), and the temperature difference of the batteries connected in series is small.
In summary, according to the temperature adjustment system of the vehicle in the embodiment of the present invention, the battery temperature adjustment module obtains the required power for temperature adjustment and the actual power for temperature adjustment of the battery, obtains the in-vehicle temperature and the set temperature of the air conditioner of the vehicle, and adjusts the opening degrees of the in-vehicle cooling branch and the battery cooling branch according to the required power for temperature adjustment, the actual power for temperature adjustment, the in-vehicle temperature, and the set temperature of the air conditioner. Therefore, the system adjusts the opening degrees of the in-vehicle cooling branch and the battery cooling branch, can quickly adjust the temperature when the temperature of the vehicle-mounted battery is too high or too low, maintains the temperature of the vehicle-mounted battery within a preset range, avoids the condition that the temperature influences the performance of the vehicle-mounted battery, and can meet the requirement of the in-vehicle temperature under the condition that the temperature of the battery meets the requirement.
Fig. 15 is a flowchart of a temperature adjustment method of a vehicle according to a first embodiment of the invention. As shown in fig. 15, the temperature adjustment method of the vehicle includes the steps of:
s1', obtaining the temperature regulation required power P1 and the temperature regulation actual power P2 of the battery.
Further, as shown in fig. 16, in the embodiment of the present invention, the obtaining the temperature adjustment required power P1 of the battery specifically includes:
s11', acquiring a first parameter when the battery opening temperature is adjusted, and generating first temperature adjustment required power according to the first parameter.
And S12', acquiring a second parameter of the battery during temperature adjustment, and generating a second temperature adjustment required power according to the second parameter.
S13', generating a temperature regulation demand power P1 according to the first temperature regulation demand power and the second temperature regulation demand power.
Further, according to an embodiment of the present invention, the first parameters are an initial temperature and a target temperature at which the battery is opened for temperature adjustment and a target time t from the initial temperature to the target temperature, and the generating the first temperature adjustment required power according to the first parameters specifically includes: a first temperature difference Delta T between an initial temperature and a target temperature is obtained 1(ii) a According to the first temperature difference Delta T1And the target time t generates the first temperature regulation required power.
Still further, according to an embodiment of the present invention, the first temperature regulation required power is generated by the following formula (1):
ΔT1*C*M/t, (1)
wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
According to an embodiment of the present invention, the second parameter is an average current I of the battery for a preset time, and the second temperature regulation required power is generated by the following formula (2):
I2*R, (2)
wherein I is the average current and R is the internal resistance of the battery.
When the battery is cooled, P1 ═ Δ T1*C*M/t+I2R; when the battery is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, as shown in fig. 16, the obtaining of the temperature-adjusted actual power P2 of the battery specifically includes:
s14', the inlet temperature and the outlet temperature of the flow path for adjusting the battery temperature are acquired, and the flow velocity v of the coolant flowing into the flow path is acquired.
S15', generating a second temperature difference Delta T according to the inlet temperature and the outlet temperature2
S16', according to the second temperature difference Delta T2And the flow rate v generates a temperature regulated actual power P2.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is further generated according to the following formula (3):
ΔT2*c*m, (3)
Wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the flow path densityCross-sectional area of (a).
S2', obtaining the temperature T in the vehicle and the set temperature Ts of the air conditioner.
And S3', adjusting the opening degrees of the in-vehicle cooling branch and the battery cooling branch according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the in-vehicle temperature T and the air conditioner set temperature Ts.
Further, according to an embodiment of the present invention, adjusting the opening degrees of the in-vehicle cooling branch and the battery cooling branch according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the in-vehicle temperature T, and the air-conditioning set temperature Ts includes: and adjusting the opening degrees of the in-vehicle cooling branch and the battery cooling branch according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the in-vehicle temperature T and the air conditioner set temperature Ts so as to enable the battery to reach the target temperature within the target time T.
Specifically, after the vehicle is powered on, whether the vehicle needs to be subjected to temperature adjustment is judged, if so, the initial temperature (namely the current temperature) of the battery, the target temperature and the target time t from the initial temperature to the target temperature are obtained, wherein the target temperature and the target time t can be preset according to actual conditions, and the first temperature adjustment required power is calculated according to a formula (1). Meanwhile, the average current I of the battery in the preset time is obtained, and the second temperature regulation required power is calculated according to the formula (2). Then, the temperature regulation required power P1 (required power that regulates the temperature of the battery to the target temperature) is calculated from the first temperature regulation required power and the second temperature regulation required power. Then, the inlet temperature and the outlet temperature of the battery are obtained, and the flow rate information is obtained, and the temperature adjustment actual power P2 is calculated according to the formula (3). And obtaining the temperature T in the vehicle and the set temperature Ts of the air conditioner. Finally, the opening degrees of the in-vehicle cooling branch and the battery cooling branch are adjusted according to P1, P2, T and Ts, so that the battery reaches the target temperature within the target time T. Therefore, the method can rapidly adjust the temperature when the temperature of the vehicle-mounted battery is too high or too low by adjusting the opening degrees of the in-vehicle cooling branch and the battery cooling branch, so that the temperature of the vehicle-mounted battery is maintained in a preset range, the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided, and the in-vehicle temperature can meet the requirement under the condition that the temperature of the battery meets the requirement.
According to an embodiment of the present invention, as shown in fig. 17, the temperature adjustment method of a vehicle described above may further include:
the temperature of the battery is detected, and it is judged whether the temperature is greater than the first temperature threshold or less than the second temperature threshold (S10 '-S20'). When the temperature of the battery is greater than the first temperature threshold, the cooling mode is entered (S30'). The first preset temperature threshold may be preset according to actual conditions, and may be, for example, 40 ℃. When the temperature of the battery is less than or equal to the first temperature threshold, whether the temperature of the battery is less than a second temperature threshold is further judged, and when the temperature of the battery is less than the second temperature threshold, a heating mode is entered (S40 '-S50'). The second preset temperature threshold may be preset according to an actual situation, and may be 0 ℃.
Specifically, after the vehicle is powered on, the temperature of the battery is detected in real time and is judged. If the temperature of the battery is higher than 40 ℃, the temperature of the battery is over high at the moment, and in order to avoid the influence of the high temperature on the performance of the battery, the battery needs to be cooled, a cooling mode is entered, and the compressor is controlled to start, so that the cooling liquid and the battery exchange heat to reduce the temperature of the battery. And if the temperature of the battery is lower than 0 ℃, the temperature of the battery is too low at the moment, and in order to avoid the influence of low temperature on the performance of the battery, the battery needs to be subjected to temperature rise treatment, and then the battery enters a heating mode, and the heater is controlled to be started to provide heating power.
It can be understood that the required power P1 for temperature regulation of the battery, the actual power P2 for temperature regulation, the temperature T in the vehicle and the set temperature Ts of the air conditioner are regulated by regulating the opening degrees of the cooling branch and the cooling branch of the battery in the vehicle, so that the temperature in the vehicle can meet the requirement while the battery meets the temperature requirement. Also, the temperature regulation required power P1 and the temperature regulation actual power P2 are easily obtained.
Specifically, as can be seen from the above embodiments, P1 is composed of two parts, taking the battery as an example of cooling, when the battery needs to be cooled, the initial temperature of the battery isWhen the battery cooling target temperature is 35 ℃ at 45 ℃, the heat which needs to be dissipated when the battery is reduced from 45 ℃ to 35 ℃ is fixed, and the formula (1) is delta T1Direct calculation of C M/t can be obtained. Wherein, Delta T1Is a first temperature difference between the initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery. Meanwhile, during the cooling process of the battery, a discharging process and a charging process exist, heat is generated in the discharging process and the charging process, and the heat of the part can also be directly obtained by detecting current through a formula (2), namely I2And R, directly calculating the heating power of the current battery, namely the second temperature regulation required power. Wherein I is the average current and R is the internal resistance of the battery. One of the key points of the invention is that the cooling time is adjustable, and the cooling completion time can be accurately determined. After the target time T required for cooling completion is determined, the temperature adjustment required power P1, P1 ═ Δ T, required for cooling the battery at present can be estimated 1*C*M/t+I2R. If the heating function is started, the temperature regulation required power P1 is delta T1*C*M/t-I2R, i.e. the greater the battery discharge or charge current during the heating of the battery, the smaller the required heating power, i.e. the temperature regulation demand power P1.
Since the discharge or charge current of the battery is varied, I2R is variable, so that to better ensure the accuracy of the cooling time, the cooling power is also varied as the current average discharge or charge current of the battery is varied. If the vehicle-mounted air conditioner cools the battery and the vehicle compartment at the same time, when the discharge current of the battery is small, I2R will decrease and at this point the vehicle air conditioner can distribute more cooling power to the cabin, allowing the cabin to reach the set air temperature faster. Meanwhile, when the discharge or charge current of the battery is large, I2R will be larger and the on-board air conditioner can distribute more cooling power to the battery. Through the adjustment, the time required by cooling the battery is always accurate, and meanwhile, the system of the vehicle-mounted air conditioner can be more efficiently and reasonably utilizedCold power, and an air conditioner with larger cooling power is not needed to be configured, so that the waste of cooling power is caused.
Since the battery cooling time is affected by the cooling efficiency, since the cooling efficiency is affected by the external environment temperature and the current temperature of the battery, and the efficiency of the temperature regulation system is constantly changed during the battery cooling process, the cooling efficiency cannot be 100%, therefore, the actual power P2 is adjusted only according to the fact that the P1 is the time that the battery cannot be accurately cooled, and the temperature of the battery needs to be detected. In the present invention, the battery temperature regulation actual power P2 can be calculated by the formula (3), i.e., Δ T2 × c ×.m. P2 can also be calculated from the actual battery cooling power P2, i.e. from the equation (4) Δ T3 × C × m1, where Δ T3 is the temperature change of the battery over a certain period of time, C is the specific heat capacity of the battery, and m1 is the battery mass. However, since the mass of the battery is large, the temperature change per unit time is not significant, and it takes a long time to detect the temperature difference, and the requirement for real-time performance is not met, the P2 power is generally calculated according to the formula (3).
Due to the influence of the cooling efficiency, P2 is difficult to be completely equal to P1, and in order to make the battery cooling target time t more accurate, adjustment needs to be carried out in real time according to the power difference between P1 and P2 so as to ensure that the temperature adjustment required power P1 of the battery is equal to the temperature adjustment actual power P2 of the battery. How to adjust the opening degrees of the in-vehicle cooling branch and the battery cooling branch according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the in-vehicle temperature T, and the air-conditioning set temperature Ts to regulate the temperature of the vehicle will be described below with reference to specific embodiments.
According to an embodiment of the present invention, as shown in fig. 18, when the cooling mode is selected, the adjusting the opening degrees of the in-vehicle cooling branch and the battery cooling branch according to the temperature regulation required power P1, the temperature regulation actual power P2, the in-vehicle temperature T, and the air-conditioning set temperature Ts specifically includes:
s31', when the temperature regulation required power P1 is greater than the temperature regulation actual power P2, it is determined whether the battery temperature T is greater than a third temperature threshold. Wherein the third temperature threshold is greater than the first temperature threshold, for example, the third temperature threshold may be 45 ℃.
S32', if the battery temperature T is greater than the third temperature threshold, the opening degree of the in-vehicle cooling branch is decreased, and the opening degree of the battery cooling branch is increased.
Specifically, after the vehicle is powered on, if the temperature of the battery is higher than 40 ℃, the temperature regulation system is controlled to enter a cooling mode to cool the battery. In the process of cooling the battery, P1 and P2 are obtained, and when the temperature regulation required power P1 is judged to be greater than the temperature regulation actual power P2, whether the temperature of the battery is greater than 45 ℃ is further judged. If the temperature of the battery is higher than 45 ℃, the temperature of the battery is over high, the vehicle-mounted air conditioner preferentially meets the cooling requirement of the battery 6, the opening degree of the cooling branch in the vehicle is controlled to be reduced, the opening degree of the cooling branch of the battery is increased, the flow rate of the cooling liquid of the cooling branch in the vehicle is reduced, and the flow rate of the cooling liquid of the cooling branch of the battery is increased, so that the temperature of the battery is reduced as soon as possible. And when the temperature of the battery is reduced to 35 ℃, the battery cooling is finished, and the battery cooling branch is controlled to be closed. Therefore, the temperature in the vehicle can meet the requirement under the condition that the temperature of the battery meets the requirement.
According to an embodiment of the present invention, as shown in fig. 18, the temperature adjustment method of a vehicle described above may further include:
and S33', if the battery temperature is less than the third temperature threshold, further judging whether the in-vehicle temperature T is greater than the set temperature Ts of the air conditioner.
S34', if the in-vehicle temperature T is greater than the air conditioner set temperature Ts, the opening degree of the in-vehicle cooling branch is increased, and the opening degree of the battery cooling branch is decreased.
Specifically, in the process of cooling the battery, when the temperature of the battery is judged to be less than 45 ℃, whether the temperature T in the vehicle is more than the set temperature Ts of the air conditioner is further judged. If T is larger than Ts, the temperature T in the vehicle does not reach the set temperature, the temperature in the vehicle is higher, the refrigeration requirement in the vehicle is met preferentially in order to prevent the user from feeling uncomfortable, the opening degree of the cooling branch in the vehicle is increased, and the opening degree of the battery cooling branch is reduced. And if the temperature T in the vehicle reaches the set temperature Ts of the air conditioner, the refrigerating power in the vehicle is sufficient and reaches balance, the opening degree of the battery cooling branch is increased so as to increase the cooling power of the battery. And when the temperature of the battery is reduced to 35 ℃, the battery cooling is finished, and the battery cooling branch is controlled to be closed. Therefore, the temperature in the vehicle can meet the requirement under the condition that the temperature of the battery meets the requirement.
That is, the battery temperature is hierarchically processed here, and the threshold values of the temperature control are 40 ℃, 45 ℃ and 35 ℃, respectively. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is reduced to 35 ℃, the battery cooling is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature regulation required power P1 is greater than the temperature regulation actual power P2, if the temperature of the battery is less than 45 ℃, the requirement for cooling in the vehicle is met, and if the cooling power in the vehicle is sufficient and reaches the balance, the opening degree of the battery cooling branch is increased to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
According to an embodiment of the present invention, as shown in fig. 18, when the heating mode is selected, the adjusting the temperature of the battery according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 specifically includes:
s35', it is determined whether the temperature regulation required power P1 is greater than the temperature regulation actual power P2.
S36', if the temperature-adjustment required power P1 is greater than the temperature-adjustment actual power P2, a power difference between the temperature-adjustment required power P1 and the temperature-adjustment actual power P2 is acquired, and the power of the heater for heating the battery is increased according to the power difference.
S37', if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the power of the heater is kept unchanged.
Specifically, when entering the heating mode, the heater is turned on, and the power of the heater is adjusted according to P1 and P2. If P1 is greater than P2, it means that the temperature of the battery cannot be raised to the target temperature within the target time t if the heater is heating at the current power. Therefore, the power difference between the P1 and the P2 is continuously obtained, and the power of the heater is increased according to the power difference, wherein the larger the difference between the P1 and the P2 is, the more the power of the heater is increased. And if P1 is less than or equal to P2, the power of the heater can be kept unchanged. When the temperature of the battery is higher than a preset temperature, for example, 10 ℃, the battery heating is completed, information for turning off the temperature adjusting function is transmitted to the vehicle-mounted air conditioner through the CAN communication, and the heater is controlled to be turned off. If the battery temperature is still below 10 c after entering the heating mode for a longer period of time, for example, 1 hour, the heater power is increased appropriately to allow the battery to finish warming as soon as possible. Therefore, the temperature adjusting power can be accurately controlled according to the actual state of the battery, and the battery can finish temperature adjustment within the target time.
According to an embodiment of the present invention, the temperature adjustment method of a vehicle described above may further include: if the temperature-regulation required power P1 is smaller than the temperature-regulation actual power P2, the pump speed is reduced. If the temperature regulation demand power P1 is greater than the temperature regulation actual power P2, the pump speed is increased.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if P1 is less than P2, the rotation speed of the pump is controlled to be reduced to save electric energy. And if P1 is larger than P2, the control can control the power of the heater to be increased or the opening degree of the battery cooling branch to be increased, and the rotating speed of the pump to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, and the actual temperature adjusting power P2 is increased, so that the temperature adjustment of the battery can be realized in the target time t.
The vehicle can comprise a single battery, and can also be formed by connecting a plurality of batteries in series, parallel or series-parallel. As shown in fig. 14A to 14B, taking the battery as 2 as an example, when the battery is 2 (the first battery and the second battery), the number of the pumps is two, and one of the two pumps is a forward pump and the other is a reverse pump.
When the temperature adjusting system enters a cooling mode, the controller respectively obtains the P1 of each battery, the temperature adjusting actual power P2 of each battery and the maximum refrigerating power P of a single compressor, and the P1 of each battery is added to calculate the total temperature adjusting required power P of the whole temperature adjusting system ZAdding the temperature-regulated actual power P2 of each battery to obtain the totalThe temperature regulates the actual power Pf. The temperature regulation required power of the first battery is P11, and the temperature regulation required power of the second battery is P12. The temperature-regulated actual power of the first battery is P21, and the temperature-regulated actual power of the second battery is P22. The maximum refrigeration power P of the compressor.
Regulating the required power P if the total temperature is adjustedZThe sum of the power P4 and the required power P in the vehicle interior is less than or equal to the maximum refrigerating power P of the compressor, namely Pz + P4 is less than or equal to P, and the compressor is operated according to PZ+ P4 refrigeration power operation.
And if the Pz + P4 is greater than P, judging whether the temperature of the first battery or the second battery is greater than 45 ℃, if so, preferentially providing cooling power for battery cooling, controlling the compressor 1 to operate according to the maximum cooling power P by the controller, setting the cooling power of the battery cooling branch 4 to Pz, and setting the cooling power of the in-vehicle cooling branch 3 to be equal to P-Pz.
If the battery temperature is not higher than 45 ℃ and the temperature in the vehicle does not reach the set temperature, cooling power is preferentially provided for the vehicle, the compressor 1 operates according to the maximum refrigerating power P, the cooling power of the cooling branch in the vehicle is P4, and the cooling power of the cooling branch in the battery is equal to P-P4.
If the temperature in the vehicle has reached the set temperature, the cooling power of the battery is preferentially satisfied. The cooling power of the battery cooling branch is Pz.
The sum of the actual power of the temperature adjustment of the first battery and the second battery is Pf, and when Pz > Pf, the power that needs to be adjusted is Pc (Pc ═ Pz-Pf). If Pz + P4+ Pc is less than or equal to P, the refrigeration power of the compressor needs to be increased to Pc, the opening degree of the second expansion valve is increased, and the rotating speed of the pump is increased. The following processes are carried out simultaneously:
if P11-P21 is Pc1, P12-P22 is Pc2, P11 is more than P21, P12 is more than P22:
when Pc1 is greater than the set value, the forward pump is controlled to be on and the reverse pump is controlled to be off, so that the cooling power of the first battery is increased. When Pc2 is greater than the set value, the reverse pump is controlled to be on and the forward pump is controlled to be off, so that the cooling power of the second battery is increased. When Pc1 > Pc2, the forward pump is controlled to be turned on and the reverse pump is controlled to be turned off, so that the cooling power of the first battery is increased. And when Pc1 is less than or equal to Pc2, controlling the reverse pump to be started and the forward pump to be closed, so that the cooling power of the second battery is increased.
And, when the temperature T61 of the first battery is greater than the temperature T62 of the second battery, the forward pump is controlled to be turned on and the reverse pump is controlled to be turned off, so that the cooling power of the first battery is increased. When the temperature T61 of the first battery is less than or equal to the temperature T62 of the second battery, the reverse pump is controlled to be started, and the forward pump is controlled to be stopped, so that the cooling power of the batteries is increased.
If P21-P11 is Pc1, P22-P12 is Pc2, P11 is less than or equal to P21, and P12 is less than or equal to P22, the following steps can be carried out:
when Pc1 is greater than the set value, the forward pump is controlled to be turned off and the reverse pump is controlled to be turned on, so that the cooling power of the first battery is reduced. When Pc2 is greater than the set value, the reverse pump is controlled to be off and the forward pump is controlled to be on, so that the cooling power of the second battery is reduced. When Pc1 > Pc2, the forward pump is controlled to be turned off and the reverse pump is controlled to be turned on, so that the cooling power of the first battery is reduced. And when Pc1 is less than or equal to Pc2, the reverse pump is controlled to be closed, and the forward pump is controlled to be opened, so that the cooling power of the second battery is reduced.
And, when the temperature T61 of the first battery is greater than the temperature T62 of the second battery, the forward pump is controlled to be turned on and the reverse pump is controlled to be turned off, so that the cooling power of the first battery is increased. When the temperature T61 of the first battery is less than or equal to the temperature T62 of the second battery, the reverse pump is controlled to be started, and the forward pump is controlled to be stopped, so that the cooling power of the batteries is increased.
In addition, when the cooling function of the first battery and the second battery is started, if the temperature of the first battery is higher than that of the second battery and the difference value exceeds a preset value, the forward pump is controlled to work, so that the cooling liquid flows through the first battery first and then the second battery, and the first battery is cooled as soon as possible. And if the temperature of the second battery is higher than that of the first battery and the difference value exceeds a preset value, controlling the reverse pump to work so that the cooling liquid flows through the second battery firstly and then flows through the first battery, and thus the second battery is cooled as soon as possible. Thus, by changing the flow direction of the coolant, the temperature difference between the first battery and the second battery can be reduced.
And when the cooling function and the heating function of the first battery and the second battery are not started, if the temperature difference between the first battery and the second battery exceeds a preset value, the forward pump or the reverse pump can be controlled to be started so as to enable the cooling liquid in the battery cooling branch to flow, and therefore the temperatures of the first battery and the second battery are balanced.
According to the temperature adjusting method of the vehicle, the required power for adjusting the temperature of the battery is firstly obtained, the actual power for adjusting the temperature of the battery is then obtained, and finally the opening degrees of the cooling branch and the battery cooling branch in the vehicle are adjusted according to the required power for adjusting the temperature, the actual power for adjusting the temperature, the temperature in the vehicle and the set temperature of the air conditioner. Therefore, the method can rapidly adjust the temperature when the temperature of the vehicle-mounted battery is too high or too low by adjusting the opening degrees of the in-vehicle cooling branch and the battery cooling branch, so that the temperature of the vehicle-mounted battery is maintained in a preset range, the condition that the performance of the vehicle-mounted battery is influenced by the temperature is avoided, and the in-vehicle temperature can meet the requirement under the condition that the temperature of the battery meets the requirement.
When battery, refrigeration branch road, in-car cooling branch road and battery cooling branch road are a plurality of, on-vehicle battery's temperature regulation system includes: the system comprises a plurality of refrigeration branches, a plurality of in-vehicle cooling branches, a plurality of battery cooling branches and a battery temperature adjusting module.
Wherein each refrigeration branch comprises a compressor 1 and a condenser 2 connected with the compressor 1. The plurality of in-vehicle cooling branches are respectively connected with the plurality of refrigeration branches. The battery temperature adjusting module 5 is connected with the battery cooling branch and is used for acquiring required temperature adjusting power P1 and actual temperature adjusting power P2, acquiring zone temperatures Tq and set air conditioner temperatures Ts of a plurality of zones in the vehicle, and adjusting the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigeration branches according to the required temperature adjusting power P1, the actual temperature adjusting power P2, the plurality of zone temperatures Tq and the set air conditioner temperatures Ts.
In the implementation of the present invention, the battery may be a battery pack or a battery module. Each battery cooling branch corresponds to a plurality of batteries connected in parallel or in series.
Further, according to an embodiment of the present invention, the battery temperature adjustment module 5 adjusts the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of cooling branches for the target time t according to the temperature-adjustment required power P1, the temperature-adjustment actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts to reach the target temperature.
For example, as shown in fig. 19A-20, taking two cooling branches, a battery cooling branch, an in-vehicle cooling branch and a battery as an example, the battery is a first battery 61 and a second battery 62 respectively, the cooling branches are a first cooling branch 11 and a second cooling branch 12 respectively, the battery cooling branch is a first battery cooling branch 401 and a second battery cooling branch 402 respectively, and the in-vehicle cooling branch loop is a first in-vehicle cooling branch 301 and a second in-vehicle cooling branch 302 respectively. Fig. 19A and 19B show the batteries connected in series, and fig. 20 shows the batteries connected in parallel. When the temperature of the first battery 61 and/or the second battery 62 is too high/low, temperature adjustment of the first battery 61 and/or the second battery 62 is required. The battery temperature adjusting module 5 obtains a temperature adjustment required power P1 and a temperature adjustment actual power P2, adjusts the opening degrees of a plurality of battery cooling branches according to P1 and P2 to adjust the cooling power of the battery, and the battery temperature adjusting module 5 obtains a plurality of zone temperatures Tq and an air conditioner set temperature Ts, and controls the opening degree of each battery cooling branch according to Tq and Ts, for example, if the Tq of a certain zone is higher and the difference between the Tq of other zones is larger, the battery temperature adjusting module 5 controls the opening degree of an in-vehicle cooling branch for cooling the zone to be increased and controls the opening degree of a corresponding battery cooling branch to be decreased, and at the same time, to ensure that the cooling power of the battery is not changed, the battery temperature adjusting module 5 controls the opening degree of another in-vehicle cooling branch to be decreased and controls the opening degree of a corresponding battery cooling branch to be increased. Therefore, the system distributes the cooling capacity of the batteries and the cooling capacity of each area in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, and can regulate the temperature when the temperature of the batteries is too high or too low so as to maintain the temperature of the batteries in a preset range and balance the temperature of each area in the carriage.
It can be understood that the refrigeration power of the battery temperature regulation module 5 is provided by the vehicle-mounted air conditioner and shares the refrigeration capacity with the refrigeration system in the vehicle, so that the volume of the temperature regulation system can be reduced, and the distribution of the flow of the cooling liquid is more flexible.
According to one embodiment of the invention, the battery cooling branch may comprise a heat exchanger 41, the heat exchanger 41 being connected to the battery temperature regulating module 5. The heat exchanger 41 may include a first pipe connected to the battery temperature adjusting module 5 and a second pipe communicated with the compressor 1, wherein the first pipe and the second pipe are independently disposed adjacent to each other. The battery temperature adjustment module 5 includes: a flow path (not specifically shown) for regulating the temperature of the battery, the flow path being provided in the battery. A pump 51, a medium container 52, a heater 53, and a controller (not specifically shown in the drawings) connected between the flow path and the heat exchanger 41. The controller obtains the temperature regulation required power P1 of the battery and the temperature regulation actual power P2 of the battery, and regulates the temperature of the battery according to the temperature regulation required power P1 and the temperature regulation actual power P2. The in-vehicle cooling branch may include: an evaporator 31, a first expansion valve 32, and a first electronic valve 33. The battery cooling branch 4 may further include a second expansion valve 42 and a second electronic valve 43.
As shown in fig. 20, when a plurality of cells are connected in parallel, a valve 58 is further provided at the inlet of the flow path of each cell. The controller can control the flow of the cooling liquid flowing into each battery through the control valve 58 according to the P1 and the P2 corresponding to each battery, respectively, so that the heating power/cooling power of each battery can be precisely controlled.
According to an embodiment of the present invention, as shown in fig. 19A to 20, when a plurality of batteries are provided and the flow paths are connected in series, the plurality of batteries correspond to a plurality of pumps that regulate the flow rate of the coolant of the batteries, and the pumps are bidirectional pumps.
As shown in fig. 19A to 20, taking the number of the cells as 2 as an example, when the number of the cells is 2 (the first cell 61 and the second cell 62) and the cells are connected in series, the number of the pumps is 2, and one of the two pumps is the forward pump 511 and the other is the reverse pump 512.
As shown in fig. 19A, when the forward pump 511 is started, the flow direction of the coolant in the second pipe is: medium container 52-heat exchanger 41-heater 53-forward pump 511-first temperature sensor 55-first battery 61-second battery 62-second temperature sensor 56-flow rate sensor 57-medium container 52. As shown in fig. 19B, when the reverse pump 512 is activated, the flow direction of the cooling liquid in the second pipe is: medium container 52-flow rate sensor 57-second temperature sensor 56-second battery 62-first battery 61-first temperature sensor 55-reversing pump 512-heater 53-heat exchanger 41-medium container 52.
In addition, when the cooling function of the first battery 61 and the second battery 62 is started, if the temperature of the first battery 61 is higher than that of the second battery 62 and the difference value exceeds a preset value, the controller controls the forward pump 511 to operate, so that the cooling liquid flows through the first battery 61 and then flows through the second battery 62, and the first battery 61 is cooled as soon as possible. If the temperature of the second battery 62 is higher than that of the first battery 61 and the difference exceeds the preset value, the controller controls the reverse pump 512 to operate, so that the cooling liquid flows through the second battery 62 and then flows through the first battery 61, and the second battery 62 is cooled as soon as possible. Thus, by changing the flow direction of the coolant, the temperature difference between the first battery 61 and the second battery 62 can be reduced. And when neither the cooling function nor the heating function of the first and second batteries 61 and 62 is activated, if the temperature difference between the first and second batteries 61 and 62 exceeds a preset value, the controller may control the forward pump 511 to be activated to flow the cooling fluid in the battery cooling branch 4, thereby equalizing the temperatures of the first and second batteries 61 and 62.
How to obtain the temperature regulation required power P1 and the temperature regulation actual power P2 is described below with reference to specific embodiments.
According to an embodiment of the present invention, the controller may be configured to respectively obtain a first parameter at the time of turning on the temperature adjustment of each battery, and generate a first temperature adjustment required power of each battery according to the first parameter, and respectively obtain a second parameter at the time of temperature adjustment of each battery, and generate a second temperature adjustment required power of each battery according to the second parameter, and generate a temperature adjustment required power P1 of each battery according to the first temperature adjustment required power of each battery and the second temperature adjustment required power of each battery.
Further, according to an embodiment of the present invention, the first parameter is an initial temperature and a target temperature at which the battery-on temperature is adjusted and a target time T from the initial temperature to the target temperature, and the controller acquires a first temperature difference Δ T between the initial temperature and the target temperature1And according to the first temperature difference DeltaT1And the target time t generates the first temperature regulation required power.
Further, the controller generates the first temperature regulation required power by the following formula (1):
ΔT1*C*M/t (1),
wherein, Delta T1Is a first temperature difference between the initial temperature and the target temperature, t is the target time, C is the specific heat capacity of the battery 6, and M is the mass of the battery.
The second parameter is the average current I of each battery in the preset time, and the controller generates a second temperature regulation required power through the following formula (2):
I2*R, (2),
wherein I is the average current and R is the internal resistance of the battery.
When the battery is cooled, P1 ═ Δ T1*C*M/t+I2R; when the battery is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, the controller generates the second temperature difference Δ T of each cell according to the inlet temperature detected by the first temperature sensor 55 and the outlet temperature detected by the second temperature sensor 56 of the circuit in which each cell is located, respectively2And according to the second temperature difference DeltaT of each battery2And the flow rate v detected by the flow rate sensor 57 generates the temperature-adjusted actual power P2 for each cell.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
Specifically, as shown in fig. 19A-20, after the vehicle is powered on, the controller determines whether the vehicle needs to be temperature-regulated, and if it is determined that the vehicle needs to be temperature-regulated, the controller turns on the temperature regulation function and sends a low speed message to the pump 51, and the pump starts to operate at a default speed (e.g., a low speed). The controller may obtain an initial temperature (i.e., a current temperature), a target temperature, and a target time t from the initial temperature to the target temperature of each battery, where the target temperature and the target time t may be preset according to an actual situation, and calculate a first temperature adjustment required power of each battery according to formula (1). Meanwhile, the controller respectively obtains the average current I of each battery in the preset time, and calculates the second temperature regulation required power of each battery according to the formula (2). Then, the controller calculates a temperature adjustment required power P1 based on the first temperature adjustment required power and the second temperature adjustment required power of each battery, respectively. As shown in fig. 19A to 20, when the batteries are connected in series, the controller acquires temperature information detected by the first temperature sensor 55 and the second temperature sensor 56, acquires flow rate information detected by the flow rate sensors, and calculates the temperature-adjusted actual power P2 of the batteries according to equation (3). As shown in fig. 20, when the batteries are connected in parallel, the controller acquires temperature information detected by the first temperature sensor 55 and the second temperature sensor 56 provided corresponding to each battery, respectively, and also acquires flow rate information detected by the flow rate sensor 57, respectively, and calculates the temperature-adjusted actual power P2 of each battery 6, respectively, according to the formula (3).
How to adjust the opening degrees of the plurality of in-vehicle cooling branches (31 and 32), the plurality of battery cooling branches (401 and 402), and the plurality of refrigeration branches (11 and 12) according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts will be described below with reference to specific embodiments.
According to one embodiment of the invention, the controller is further configured to generate a total temperature regulation required power Pz according to the temperature regulation required power P1 of the plurality of batteries, and determine whether the total temperature regulation required power Pz matches the maximum cooling power P of the vehicle-mounted air conditioner, wherein if matching, the controller cools the batteries according to the total temperature regulation required power P1 of the plurality of batteries connected in parallel; if not, the controller adjusts the required power P1 to cool the battery according to the maximum refrigerating power P of the compressor and the temperature of the plurality of battery cooling branches.
Specifically, as shown in fig. 20, when the battery cooling function is turned on, the controller may calculate the total temperature adjustment required power Pz of the entire temperature adjustment system according to the temperature adjustment required power P1 of each battery, that is, the total temperature adjustment required power Pz may be obtained by adding the temperature adjustment required power P1 of each battery. Then, the P is judged according to the total temperature regulation required power Pz ZAnd (3) whether the temperature of the battery is matched with the maximum refrigerating power P of the vehicle-mounted air conditioner, namely judging whether Pz is less than or equal to P, and if so, adjusting the required power P1 by the controller according to the temperature of each battery to cool each battery through the control valve 58. And if PZAnd the maximum refrigerating power P of the vehicle-mounted air conditioner is not matched, namely Pz is larger than P, the controller adjusts the required power P1 according to the maximum refrigerating power P of the air conditioner and the temperature of each battery, and the flow of the cooling liquid is distributed in proportion by adjusting the opening of the valve 58, so that each battery can be cooled at the maximum efficiency.
According to one embodiment of the invention, the plurality of refrigeration branches correspond to the plurality of air outlets respectively, and the temperature of the plurality of areas is the temperature of the plurality of air outlets.
For example, as shown in fig. 21, 4 air outlets, air outlet 1-air outlet 4, may be disposed in the vehicle cabin. The corresponding zone temperature Tq is detected by detecting the tuyere temperature Tc. Suppose that the air outlet 1 and the air outlet 2 are provided with refrigeration power by the first refrigeration branch 11, and the air outlet 3 and the air outlet 4 are provided with refrigeration power by the second refrigeration branch 12.
According to an embodiment of the invention, the controller is further configured to detect temperatures of the plurality of batteries, and control the temperature adjustment system to enter the cooling mode when the temperature of any one of the plurality of batteries in parallel is greater than a first temperature threshold, and control the temperature adjustment system to enter the heating mode when the temperature of any one of the plurality of batteries is less than a second temperature threshold. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the controller detects the temperature of each battery in real time and makes a judgment. If the temperature of one of the batteries is higher than 40 ℃, which indicates that the temperature of the battery is too high at this time, in order to avoid the high temperature from affecting the performance of the battery, the temperature of the battery needs to be reduced, the controller controls the temperature adjustment system to enter a cooling mode, sends a battery cooling function starting message to the air conditioning system, and controls the second electronic valve 43 to be opened, so that the cooling liquid exchanges heat with the battery to reduce the temperature of the battery.
If the temperature of a certain battery is lower than 0 ℃, which indicates that the temperature of the battery 6 is too low at this time, in order to avoid the influence of low temperature on the performance of the battery, the temperature of the battery needs to be raised, and the controller controls the temperature regulation system to enter a heating mode, controls the second electronic valve 43 to close, and controls the heater 53 to open to provide heating power for the temperature regulation system.
According to an embodiment of the present invention, when the cooling mode is selected, the controller is further configured to determine whether the battery temperature is greater than a third temperature threshold value when the temperature adjustment demand power P1 of the battery cooling branch is greater than the temperature adjustment actual power P2, wherein if the battery temperature is greater than the third temperature threshold value, the controller decreases the opening degrees of the plurality of in-vehicle cooling branches and increases the opening degrees of the plurality of battery cooling branches, wherein the opening degrees of the plurality of battery cooling branches are respectively controlled by corresponding valves (i.e., the second expansion valves 42), and the third temperature threshold value is greater than the first temperature threshold value, for example, the third temperature threshold value may be 45 ℃.
Specifically, when in the cooling mode, if P1 is greater than P2, the controller determines whether the temperature of the battery is greater than 45 ℃. If the temperature of any one of the cells is greater than 45 c, which indicates that the temperature of the current cell is too high, the controller decreases the opening degree of the first expansion valve 32 to decrease the flow rate of the cooling liquid of the cooling branch of the vehicle, while increasing the opening degree of the second expansion valve 42 to increase the flow rate of the cooling liquid of the cooling branch of the cell. Therefore, the temperature of the battery can be adjusted within the target time when the temperature of the battery is overhigh by adjusting the refrigerating capacity distribution of the in-vehicle cooling branch and the battery cooling branch.
According to an embodiment of the present invention, in the cooling mode, the controller is further configured to obtain a power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2 when the temperature adjustment required power P1 of the certain battery is greater than the temperature adjustment actual power P2 of the battery, and increase the power of the compressor 1 for cooling of the battery according to the power difference, or adjust the flow rate of the cooling fluid of the circulation branch loop of the battery to increase the cooling power of the battery, or adjust the actual power P2 when the temperature adjustment required power P1 of the certain battery is less than or equal to the temperature of the battery to decrease the power of the compressor or keep the power of the compressor constant, or adjust the flow rate of the cooling fluid of the circulation branch loop of the battery to decrease the cooling power of the battery.
Specifically, when operating in the cooling mode, if there are a plurality of batteries, the controller acquires P1 and P2 of each battery, respectively, and makes a judgment. If the P1 of one of the batteries is greater than the P2, it indicates that if the temperature of the battery cannot be reduced within the target time according to the current cooling power or the current cooling liquid flow rate, therefore, the controller obtains the power difference between the P1 and the P2 of the battery, and increases the power of the compressor 1 according to the power difference, or increases the cooling liquid flow rate of the circulation branch loop of the battery to increase the cooling power of the battery, wherein the larger the power difference between the P1 and the P2, the more the power of the compressor 1 and the cooling liquid flow rate of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If the P1 of one of the batteries is less than or equal to P2, the power of the compressor 1 can be kept unchanged or the power of the compressor 1 can be properly reduced, or the flow of the cooling liquid in the circulation branch loop of the battery can be reduced, so that the cooling power of the battery can be reduced. When the temperature of all the batteries is lower than 35 ℃, the cooling of the batteries is completed, and the controller sends a message for turning off the temperature regulation function to the vehicle-mounted air conditioner through the CAN communication and controls the second electronic valve 43 to be closed. If the temperature of the battery is still higher than 35 ℃ after the temperature regulating system enters the cooling mode for a long time, for example, after 1 hour, the controller increases the power of the compressor appropriately so as to cool the battery as soon as possible.
According to an embodiment of the present invention, the controller is further configured to decrease the opening degrees of the plurality of in-vehicle cooling branches and increase the opening degrees of the plurality of battery cooling branches when the temperature of a certain battery is less than the third temperature threshold and the in-vehicle temperature is equal to the air conditioner set temperature Ts.
Specifically, when in the cooling mode, if the temperature of each battery is less than 45 ℃, the controller judges whether the temperature in the vehicle reaches the air conditioner set temperature Ts. If so, the controller decreases the opening degree of the first expansion valve 32 and increases the opening degree of the second expansion valve 42 to increase the flow rate of the cooling liquid in the cooling branch of the battery, decrease the flow rate of the cooling liquid in the cooling branch of the vehicle, and complete the cooling of the battery as soon as possible. And if the in-vehicle temperature does not reach the air-conditioning set temperature Ts, the cooling demand in the vehicle is preferentially satisfied, and the controller increases the opening degree of the first expansion valve 32 and decreases the opening degree of the second expansion valve 42.
In addition, the battery temperature is processed in a layered mode, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is reduced to 35 ℃, the battery cooling is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature-regulation required power P1 is greater than the temperature-regulation actual power P2, if the battery temperature does not exceed 45 ℃, the cooling demand in the vehicle is still prioritized, and if the cooling power in the vehicle is sufficient and reaches a balance, the controller increases the opening degree of the battery cooling branch to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
According to an embodiment of the present invention, the controller is further configured to obtain a temperature difference between the temperatures of the plurality of regions, and when the temperature difference is greater than a fourth temperature threshold, increase an opening degree of an in-vehicle cooling branch corresponding to the cooling branch where the air outlet with a high temperature is located, and decrease an opening degree of a battery cooling branch corresponding to the cooling branch where the air outlet with a high temperature is located. The fourth temperature threshold may be preset according to actual conditions, and may be, for example, 3 ℃.
Further, according to an embodiment of the present invention, the controller is further configured to reduce an opening degree of an in-vehicle cooling branch corresponding to the cooling branch where the air outlet with the low temperature is located, and increase an opening degree of a battery cooling branch corresponding to the cooling branch where the air outlet with the low temperature is located.
Specifically, in the battery cooling process, if the air conditioner needs to be started in the vehicle, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the vehicle is kept balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 21, when it is detected that the zone temperature Tq at the outlet port 1 and the outlet port 2 is higher than the zone temperature Tq in the vicinity of the outlet port 3 and the outlet port 4 by 3 ℃ or more, the opening degree of the first expansion valve 32 in the first in-vehicle cooling branch 301 is controlled to be increased, while the opening degree of the second expansion valve 42 in the first battery cooling branch 401 is controlled to be decreased, so that the cooling power in the first in-vehicle cooling branch 301 is increased. The controller also controls the opening degree of the first expansion valve 32 in the second in-vehicle cooling branch 302 to decrease and the opening degree of the second expansion valve 42 in the second battery cooling branch 402 to increase so that the cooling power in the second in-vehicle cooling branch 302 is smaller. Therefore, the cooling power of the first battery cooling circuit 301 and the second battery cooling circuit 302 is not changed, and the air temperature in the areas near the air outlets in the vehicle is balanced. When the vehicle-mounted air conditioner detects that the difference between the air temperatures Tq in the areas near the air outlet 1 and the air outlet 2 and the air temperatures Tq in the areas near the air outlet 3 and the air outlet 4 is within 3 ℃, the controller controls the opening degrees of the first expansion valves 32 in the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 to be the same so as to ensure that the cooling powers of the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 are the same.
According to an embodiment of the present invention, when the heating mode is selected, the controller obtains a power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2 when the temperature adjustment required power P1 of the certain battery is greater than the temperature adjustment actual power P2 of the battery, and increases the power of the heater for heating the battery according to the power difference, or adjusts the flow rate of the coolant for increasing the heating power of the battery, and decreases the power of the heater or keeps the power of the heater constant, or adjusts the flow rate of the coolant for decreasing the circulation branch circuit of the battery when the temperature adjustment required power P1 of the certain battery is less than or equal to the temperature adjustment actual power P2 of the battery, to decrease the heating power of the battery.
Specifically, when in the heating mode, the controller acquires P1 and P2 of each battery, respectively, and makes a judgment. If P1 of one of the batteries is greater than P2, it indicates that the temperature rise of the battery cannot be completed within the target time according to the current heating power or cooling liquid flow, so the controller obtains the power difference between P1 and P2 of the battery, and increases the power of the heater 53 for heating the battery according to the power difference, or increases the cooling liquid flow of the circulation branch loop of the battery by adjusting the corresponding increase of the rotation speed of the pump 51, so that the battery can complete the temperature adjustment within the target time t. Wherein the larger the difference between P1 and P2, the more the power of the heater 53 is increased. If P1 of a certain battery is less than or equal to P2, the controller can reduce the power of the heater 53 to save electric energy, or reduce the flow rate of the coolant in the circulation branch loop of the battery by adjusting the corresponding speed reduction of the pump 51 to reduce the heating power, or keep the power of the heater 53 unchanged. When the temperature of all the batteries is higher than a preset temperature, for example, 10 c, the battery heating is completed, and the controller transmits a message for turning off the temperature adjusting function to the in-vehicle air conditioner through CAN communication and controls the heater 53 to be turned off. If the battery temperature is still below 10 c after the thermostat system enters the heating mode for an extended period of time, such as 1 hour, the controller will again increase the power to the heater 53 appropriately to allow the battery to finish warming as quickly as possible.
According to an embodiment of the present invention, the controller is further configured to decrease the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is less than the corresponding temperature-regulation actual power P2, and increase the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is greater than the corresponding temperature-regulation actual power P2.
Specifically, when the thermostat system enters the heating mode or the cooling mode, if P1 of a certain battery is less than P2, the controller controls the rotational speed of the corresponding pump 51 to be reduced to save electric power. If the P1 of a certain battery 6 is larger than the P2, the controller controls the power of the corresponding heater 53 or compressor 1 to be increased or the flow rate of the cooling liquid in the loop where the battery is located to be increased, and controls the rotating speed of the pump 51 to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, and the temperature adjustment actual power P2 of the battery is increased, and the temperature adjustment is realized in the target time t.
According to an embodiment of the present invention, as shown in fig. 20, a plurality of batteries are connected in parallel, and the controller is further configured to, when the temperature difference between the batteries exceeds a set value in the cooling mode, increase the cooling power of the battery having a higher temperature; when the temperature difference between the batteries exceeds a set value in the heating mode, the heating power of the battery with the lower temperature is increased. Wherein the set value may be 3 ℃.
Specifically, as shown in fig. 20, when the batteries are connected in parallel, a valve 58 is further provided at the inlet of the flow path of each battery, and in the cooling mode, when the temperature difference between the batteries exceeds 3 ℃, the controller increases the cooling power of the battery with a higher temperature by increasing the opening degree of the valve 58 in the battery cooling branch in which the battery with a higher temperature is located. In the heating mode, when the temperature difference between the batteries exceeds 3 ℃, the controller increases the opening degree of the valve 58 in the battery cooling branch where the battery with lower temperature is located to increase the heating power of the battery with lower temperature.
According to an embodiment of the present invention, as shown in fig. 20, a plurality of cells are connected in parallel, and in the cooling mode, the controller individually controls the flow rate of the coolant in each of the branch flow paths, and adjusts the required power according to the temperature of each cell, and adjusts the flow rate of the coolant in each of the cell group flow paths so that the actual temperature adjustment actual power and the temperature required power of each cell are equal.
Specifically, as shown in fig. 20, in the cooling mode, the controller may control the flow rates of the cooling liquids flowing into the flow paths of the first battery 61 and the second battery 62 by controlling the opening degrees of the second expansion valves 42, and may control the flow rates of the cooling liquids flowing into the flow paths of the first battery 401 and the second battery 62 by controlling the opening degrees of the valves 58, respectively, so that the real temperature adjustment real power P1 and the temperature demand power P2 of each battery are equalized to complete the temperature adjustment of the batteries as soon as possible.
According to an embodiment of the present invention, as shown in fig. 19A to 20, when a plurality of batteries are provided and the flow paths are connected in series, the plurality of batteries correspond to a plurality of pumps that regulate the flow rate of the coolant of the batteries, and the pumps are bidirectional pumps.
In order to make the present invention more clearly understood by those skilled in the art, the operation of the temperature regulation system of the vehicle-mounted battery is described below with reference to specific examples.
The main difference between fig. 19A and fig. 14A is the addition of a compressor refrigeration circuit, while increasing the temperature equalization of the in-vehicle air conditioner outlet and the power regulation problem between the compressors. Only the differences are listed below, and the others are not described below.
As shown in fig. 19A, when the temperature regulation system enters the cooling mode, the controller obtains P1 of each battery 6, the temperature regulation actual power P2 of each battery, and the maximum cooling power P of a single compressor, respectively, and adds P1 of each battery to calculate the total temperature regulation required power Pz of the entire temperature regulation system, adds the temperature regulation actual power P2 of each battery to obtain the total temperature regulation actual power Pf, and adds the maximum cooling power of each compressor to calculate the sum P5 of the maximum cooling powers of all the compressors. P51 is the maximum refrigeration capacity of the compressor 11, P52 is the maximum refrigeration capacity of the compressor 12, P5 is the sum of the maximum refrigeration capacities of all the compressors, and P5 is P51+ P52. The temperature regulation required power of the first battery 61 is P11, and the temperature regulation required power of the second battery 62 is P12. The temperature-regulated actual power of the first battery 61 is P21, and the temperature-regulated actual power of the second battery 62 is P22.
If Pz is less than or equal to P51, only one compressor 1 is controlled to work to provide refrigerating power, and two compressors 1 can also be controlled to work together. If P51 < Pz ≦ P5, two compressors are required to work together, and the initial cooling power of each compressor may be Pz/2, or other power combinations, so that the sum of the cooling power of the 2 compressors is Pz. If Pz > P5, two compressors are required to work together, each compressor operating at maximum refrigeration capacity. The power required for temperature regulation of the in-vehicle cooling branch is P4, i.e., P4 is the power required for regulating the in-vehicle temperature to the set temperature.
When the in-vehicle cooling and the battery cooling are simultaneously started, it is assumed that the temperatures of the areas of the air outlet 1 and the air outlet 2 are T51, and the temperatures of the areas of the air outlet 3 and the air outlet 4 are T52.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment is carried out:
if Pz + P4 is not more than P5, the refrigeration power of the first compressor 11 is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the T51 temperature is accelerated to be reduced, the cooling power requirement of the battery is met, and the.
If Pz + P4 is more than P5, the first compressor 11 and the second compressor 12 are controlled to operate at the maximum refrigerating power, meanwhile, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or simultaneously, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the temperature T51 is reduced rapidly, meanwhile, the requirement of the cooling power of the battery is met, and.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment can be carried out:
the closing of the battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be increased so that all the refrigeration power of the first compressor 11 is used for in-vehicle cooling. Meanwhile, the expansion valve of the battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, and the cooling power of the battery is increased, so that the temperature of T51 is accelerated to be reduced, the cooling power requirement of the battery is met, and the in-vehicle environment temperature balance is realized.
The main difference between fig. 20 and fig. 9 is the addition of a compressor refrigeration circuit, while increasing the temperature equalization of the in-vehicle air conditioner outlet and the power regulation problem between the compressors. Only the differences are listed below, and the others are not described below.
As shown in fig. 20, when the temperature regulation system enters the cooling mode, the controller obtains P1 of each battery 6, the temperature regulation actual power P2 of each battery, and the maximum cooling power P of a single compressor, respectively, and adds P1 of each battery to calculate the total temperature regulation required power Pz of the entire temperature regulation system, adds the temperature regulation actual power P2 of each battery to obtain the total temperature regulation actual power Pf, and adds the maximum cooling power of each compressor to calculate the sum P5 of the maximum cooling powers of all the compressors. P51 is the maximum refrigeration capacity of the compressor 11, P52 is the maximum refrigeration capacity of the compressor 12, P5 is the sum of the maximum refrigeration capacities of all the compressors, and P5 is P51+ P52. The temperature regulation required power of the first battery 61 is P11, and the temperature regulation required power of the second battery 62 is P12. The temperature-regulated actual power of the first battery 61 is P21, and the temperature-regulated actual power of the second battery 62 is P22.
If Pz is less than or equal to P51, only one compressor 1 is controlled to work to provide refrigerating power, and two compressors 1 can also be controlled to work together. If P51 < Pz ≦ P5, two compressors are required to work together, and the initial cooling power of each compressor may be Pz/2, or other power combinations, so that the sum of the cooling power of the 2 compressors is Pz. If Pz > P5, two compressors are required to work together, each compressor operating at maximum refrigeration capacity. The power required for temperature regulation of the in-vehicle cooling branch is P4, i.e., P4 is the power required for regulating the in-vehicle temperature to the set temperature.
When the in-vehicle cooling and the battery cooling are simultaneously started, it is assumed that the temperatures of the areas of the air outlet 1 and the air outlet 2 are T51, and the temperatures of the areas of the air outlet 3 and the air outlet 4 are T52.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment is carried out:
if Pz + P4 is not more than P5, the refrigeration power of the first compressor 11 is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the T51 temperature is accelerated to be reduced, the cooling power requirement of the battery is met, and the.
If Pz + P4 is more than P5, the first compressor 11 and the second compressor 12 are controlled to operate at the maximum refrigerating power, meanwhile, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or simultaneously, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the temperature T51 is reduced rapidly, meanwhile, the requirement of the cooling power of the battery is met, and.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment can be carried out:
the closing of the battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be increased so that all the refrigeration power of the first compressor 11 is used for in-vehicle cooling. Meanwhile, the expansion valve of the battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, and the cooling power of the battery is increased, so that the temperature of T51 is accelerated to be reduced, the cooling power requirement of the battery is met, and the in-vehicle environment temperature balance is realized. According to the temperature adjusting system of the vehicle-mounted battery, the refrigerating capacities of the battery and each area in the compartment can be distributed according to the actual state of each battery, the temperatures of a plurality of areas in the compartment and the set temperature of the air conditioner, the temperature can be adjusted when the temperature of the battery is too high or too low, the temperature of the battery is maintained in a preset range, and the temperature of each area in the compartment can be balanced.
When the temperature adjustment system of the on-vehicle battery includes a plurality of battery cooling branches, a plurality of in-vehicle cooling branches, and a plurality of cooling branches, as shown in fig. 22, the temperature adjustment method of the on-vehicle battery includes the steps of:
And S1' respectively obtaining the temperature regulation required power P1 and the temperature regulation actual power P2 of the batteries in the battery cooling branches. The battery cooling branch is used for adjusting the temperature of the corresponding battery.
According to an embodiment of the present invention, as shown in fig. 23, the respectively obtaining the power required for temperature adjustment of the plurality of batteries specifically includes:
and S11' respectively acquiring a first parameter when the opening temperature of each battery is adjusted, and generating a first temperature adjustment required power of each battery according to the first parameter.
And S12', acquiring a second parameter of each battery during temperature adjustment, and generating a second temperature adjustment required power of each battery according to the second parameter.
And S13', generating the temperature regulation required power P1 of the battery cooling branch according to the first temperature regulation required power and the second temperature regulation required power of each battery.
Further, according to an embodiment of the present invention, the first parameters are an initial temperature and a target temperature at which the battery is opened for temperature adjustment and a target time t from the initial temperature to the target temperature, and the generating the first temperature adjustment required power according to the first parameters specifically includes: a first temperature difference Delta T between an initial temperature and a target temperature is obtained 1(ii) a According to the first temperature difference Delta T1And the target time t generates the first temperature regulation required power.
Still further, according to an embodiment of the present invention, the first temperature regulation required power is generated by the following formula (1):
ΔT1*C*M/t, (1)
wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
According to an embodiment of the present invention, the second parameter is an average current I of the battery for a preset time, and the second temperature regulation required power is generated by the following formula (2):
I2*R, (2)
wherein I is the average current and R is the internal resistance of the battery.
When the battery is cooled, P1 ═ Δ T1*C*M/t+I2R; when the battery is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, as shown in fig. 23, the obtaining the temperature-regulated actual power P2 of the plurality of batteries specifically includes:
s14' ″, the inlet temperature and the outlet temperature of the flow path for adjusting the temperatures of the plurality of cells are acquired, and the flow velocity v of the cooling liquid flowing into the flow path is acquired.
S15', generating a second temperature difference Delta T of the plurality of batteries according to the inlet temperature and the outlet temperature of the flow path of the plurality of batteries2
S16', based on the second temperature difference Δ T of the plurality of batteries 2And the flow rate v generates a temperature regulated actual power P2 for the plurality of cells.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is further generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
And S2' ″, respectively acquiring the zone temperature Tq and the air-conditioning set temperature Ts of a plurality of zones in the vehicle.
And S3' adjusting the opening degree of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigeration branches according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the plurality of zone temperatures Tq and the air conditioner set temperature Ts.
Further, according to an embodiment of the present invention, the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of cooling branches are adjusted to reach the target temperature within the target time t according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts.
As shown in fig. 19A-20, each battery cooling branch corresponds to multiple batteries connected in parallel or in series.
Specifically, for example, the refrigeration branch, the battery cooling branch, the in-vehicle cooling branch and the battery are two, the battery is a first battery and a second battery respectively, the refrigeration branch is a first refrigeration branch and a second refrigeration branch respectively, the battery cooling branch is a first battery cooling branch and a second battery cooling branch respectively, and the in-vehicle cooling branch loop is a first in-vehicle cooling branch and a second in-vehicle cooling branch respectively. When the temperature of the first battery and/or the second battery is too high/too low, temperature regulation of the first battery and/or the second battery is required. The method comprises the steps of obtaining required temperature regulation power P1 and actual temperature regulation power P2, regulating the opening degree of a plurality of battery cooling branches according to P1 and P2 to regulate the cooling power of batteries, obtaining a plurality of zone temperatures Tq and set air conditioner temperatures Ts, and controlling the opening degree of each battery cooling branch according to the Tq and the Ts, wherein for example, if the Tq of a certain zone is higher and the Tq of other zones is different greatly, the opening degree of an in-vehicle cooling branch for cooling the zone is controlled to be increased, the opening degree of a corresponding battery cooling branch is controlled to be decreased, meanwhile, the opening degree of another in-vehicle cooling branch is controlled to be decreased, and the opening degree of a corresponding battery cooling branch is controlled to be increased to ensure that the cooling power of the batteries is unchanged. Therefore, the method distributes the cooling capacity of the batteries and the cooling capacity of each area in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, and not only can adjust the temperature when the temperature of the batteries is too high or too low to maintain the temperature of the batteries in a preset range, but also can balance the temperature of each area in the carriage.
How to adjust the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts will be described below with reference to specific embodiments.
According to an embodiment of the present invention, as shown in fig. 23, when there are a plurality of on-board batteries and there are a plurality of in-vehicle cooling branches, battery cooling branches, and cooling branches, the method for adjusting the temperature of an on-board battery described above may further include:
s31', generating total temperature regulation required power P1 according to the temperature regulation required power P of each batteryZ
S32' ″, judging the total temperature regulation demand power PZWhether the maximum refrigerating power is matched with the maximum refrigerating power P of the vehicle-mounted air conditioner.
And S33' ″, if the temperature of the batteries is matched, the required power is adjusted according to the temperatures of the batteries to cool the batteries.
And S34', if not, adjusting the required power P1 according to the maximum refrigerating power P of the compressor and the temperatures of the battery cooling branches to cool the batteries.
Specifically, when a plurality of batteries are connected in parallel, the total temperature adjustment required power Pz of the entire temperature adjustment system may be calculated according to the temperature adjustment required power P1 of each battery, that is, the temperature adjustment required power P1 of each battery may be added to obtain the total temperature adjustment required power Pz. Then judging whether the Pz is matched with the maximum refrigerating power P of the vehicle-mounted air conditioner according to the total temperature regulation required power Pz, namely judging P ZIf less than or equal to P, and if so, adjusting the power demand P1 based on the temperature of each battery cools each battery by controlling a valve in the battery cooling branch. And if Pz does not match the maximum cooling power P of the vehicle-mounted air conditioner, namely Pz is greater than P, adjusting the required power P1 according to the maximum cooling power P of the air conditioner and the temperature of each battery, and adjustingThe opening of the valve in the battery cooling branch is proportionally distributed to the flow of the cooling liquid, so that each battery can be cooled at the maximum efficiency.
According to an embodiment of the present invention, the temperature adjustment method of the battery may further include the steps of: the temperatures of the plurality of batteries are detected. Entering a cooling mode when the temperature of any one of the plurality of batteries is greater than a first temperature threshold. And entering a heating mode when the temperature of any battery in the plurality of batteries is less than a second temperature threshold value. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the temperature of each battery is detected in real time and is judged. If the temperature of one of the batteries is higher than 40 ℃, the temperature of the battery is over high at the moment, and in order to avoid the influence of the high temperature on the performance of the battery, the battery needs to be cooled, enters a cooling mode, and sends a battery cooling function starting message to an air conditioning system. If the temperature of a certain battery is lower than 0 ℃, the temperature of the battery is too low at the moment, so that the battery needs to be subjected to temperature rise treatment to avoid the influence of low temperature on the performance of the battery, and the battery enters a heating mode, a corresponding battery cooling branch is controlled to be closed, and a heater is controlled to be opened to provide heating power for the battery.
According to an embodiment of the present invention, as shown in fig. 21, the plurality of refrigeration branches correspond to the plurality of air outlets, respectively, and the temperature of the plurality of zones is the temperature of the plurality of air outlets.
For example, as shown in fig. 21, 4 air outlets, air outlet 1-air outlet 4, may be disposed in the vehicle cabin. The corresponding zone temperature Tq is detected by detecting the tuyere temperature Tc. Suppose that the air outlet 1 and the air outlet 2 are provided with refrigeration power by the first refrigeration branch 11, and the air outlet 3 and the air outlet 4 are provided with refrigeration power by the second refrigeration branch 12.
According to an embodiment of the present invention, when the cooling mode is selected, adjusting the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts specifically includes: and when the temperature regulation required power P1 of the battery cooling branch is greater than the temperature regulation actual power P2, judging whether the battery temperature is greater than a third temperature threshold value. Wherein the third temperature threshold is greater than the first temperature threshold, for example, the third temperature threshold may be 45 ℃. And if the temperature of the battery is greater than the third temperature threshold value, reducing the opening degree of the plurality of in-vehicle cooling branches and increasing the opening degree of the plurality of battery cooling branches. The opening degrees of the battery cooling branches are respectively controlled through corresponding valves.
Specifically, when in the cooling mode, if P1 is greater than P2, it is determined whether the temperature of the battery is greater than 45 ℃. If the temperature of any one of the cells is greater than 45 c, which indicates that the temperature of the current cell is too high, the opening degree of the first expansion valve 32 is decreased to decrease the flow rate of the cooling liquid of the cooling branch of the vehicle, while the opening degree of the second expansion valve 42 is increased to increase the flow rate of the cooling liquid of the cooling branch of the cell. Therefore, the temperature of the battery can be adjusted within the target time when the temperature of the battery is overhigh by adjusting the refrigerating capacity distribution of the in-vehicle cooling branch and the battery cooling branch.
According to an embodiment of the present invention, when the cooling mode is the cooling mode, adjusting the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of cooling branches according to the temperature regulation required power P1, the temperature regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts, further includes: judging whether the temperature regulation required power P1 of each battery is larger than the temperature regulation actual power P2 of the battery; if the temperature regulation required power P1 of a certain battery is larger than the temperature regulation actual power P2 of the battery, acquiring the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increasing the power of a compressor for cooling the battery according to the power difference or adjusting and increasing the flow rate of cooling liquid of a circulation branch loop of the battery to increase the cooling power of the battery; if the temperature regulation required power P1 of a certain battery is less than or equal to the temperature regulation actual power P2 of the battery, the power of the compressor is reduced or kept unchanged, or the flow of the cooling liquid of the circulation branch loop of the battery is regulated and reduced, so that the cooling power of the battery is reduced.
Specifically, when operating in the cooling mode, if there are a plurality of batteries, P1 and P2 of each battery are acquired, respectively, and judgment is made. If the P1 of one of the batteries is larger than the P2, the fact that the temperature of the battery cannot be reduced within the target time according to the current refrigerating power or the current cooling liquid flow is shown, so the power difference between the P1 and the P2 of the battery is obtained, the power of the compressor 1 is increased according to the power difference, or the cooling liquid flow of the circulation branch loop of the battery is increased to increase the cooling power of the battery, wherein the larger the power difference between the P1 and the P2 is, the more the power of the compressor and the cooling liquid flow of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If P1 of one of the batteries is less than or equal to P2, the power of the compressor can be kept unchanged or reduced appropriately, or the flow of the cooling liquid of the circulation branch loop of the battery is reduced, so that the cooling power of the battery is reduced. When the temperature of all the batteries is lower than 35 ℃, the batteries are cooled, the information for closing the temperature adjusting function is sent to the vehicle-mounted air conditioner through CAN communication, and the second electronic valve is controlled to be closed. If the temperature of the battery is still higher than 35 ℃ after the temperature regulating system enters the cooling mode for a long time, for example, after 1 hour, the power of the compressor is appropriately increased so that the temperature of the battery is reduced as soon as possible.
According to one embodiment of the invention, if the battery temperature is less than the third temperature threshold, further judging whether the in-vehicle temperature is equal to the air conditioner set temperature Ts; and if the in-vehicle temperature is equal to the set air conditioner temperature Ts, reducing the opening degree of the plurality of in-vehicle cooling branches and increasing the opening degree of the plurality of battery cooling branches.
Specifically, when in the cooling mode, if the temperature of each battery is less than 45 ℃, the controller judges whether the temperature in the vehicle reaches the air conditioner set temperature Ts. And if so, increasing the flow of the cooling liquid of the battery cooling branch, reducing the flow of the cooling liquid of the cooling branch in the vehicle, and cooling the battery as soon as possible. And if the temperature in the vehicle does not reach the set temperature Ts of the air conditioner, the refrigeration requirement in the vehicle is preferentially met, the controller increases the flow of the cooling liquid of the cooling branch in the vehicle and reduces the flow of the cooling liquid of the battery cooling branch.
In addition, the battery temperature is processed in a layered mode, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is reduced to 35 ℃, the battery cooling is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature regulation required power P1 is greater than the temperature regulation actual power P2, if the battery temperature does not exceed 45 ℃, the cooling demand in the vehicle is still prioritized, and if the cooling power in the vehicle is already sufficient and reaches a balance, the opening degree of the battery cooling branch is increased to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
According to an embodiment of the present invention, reducing the opening degree of the plurality of in-vehicle cooling branches specifically includes: temperature differences between the temperatures of the plurality of zones are obtained. And judging whether the temperature difference is larger than a fourth temperature threshold value. And if the temperature difference is greater than the fourth temperature threshold value, increasing the opening degree of the in-vehicle cooling branch corresponding to the refrigeration branch where the air outlet with the high temperature is located, and selectively reducing the opening degree of the battery cooling branch corresponding to the refrigeration branch where the air outlet with the high temperature is located. The fourth temperature threshold may be preset according to actual conditions, and may be, for example, 3 ℃.
Further, according to an embodiment of the present invention, the temperature adjustment method of the vehicle-mounted battery further includes: and the opening degree of the in-vehicle cooling branch corresponding to the refrigeration branch where the air outlet with the low temperature is located is reduced, and the opening degree of the battery cooling branch corresponding to the refrigeration branch where the air outlet with the low temperature is located is improved.
Specifically, in the battery cooling process, if the air conditioner needs to be started in the vehicle, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the vehicle is kept balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 21, when it is detected that the zone temperature Tq at the outlet port 1 and the outlet port 2 is higher than the zone temperature Tq in the vicinity of the outlet port 3 and the outlet port 4 by 3 ℃ or more, the opening degree in the first in-vehicle cooling branch passage is increased, and the opening degree in the first battery cooling branch passage is decreased, so that the cooling power in the first in-vehicle cooling branch passage is made larger. The opening degree of the second in-vehicle cooling branch is also selectively decreased, and the opening degree of the second battery cooling branch is increased, so that the cooling power in the second in-vehicle cooling branch is smaller. Therefore, the cooling power of the first battery cooling branch and the cooling power of the second battery cooling branch are not changed, and the air temperatures of areas near the air outlets in the vehicle are balanced. When the vehicle-mounted air conditioner detects that the difference between the air temperature Tq of the area near the air outlet 1 and the air outlet 2 and the air temperature Tq of the area near the air outlet 3 and the air outlet 4 is within 3 ℃, the opening degrees of the first expansion valves in the first vehicle internal cooling branch and the second vehicle internal cooling branch are controlled to be the same, so that the cooling powers of the first vehicle internal cooling branch and the second vehicle internal cooling branch are guaranteed to be the same.
According to an embodiment of the present invention, when the heating mode is selected, the method further includes: it is determined whether the temperature regulation required power P1 of a certain battery is greater than the temperature regulation actual power P2 of the battery. If the temperature regulation required power P1 of a certain battery is larger than the temperature regulation actual power P2 corresponding to the battery, acquiring the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increasing the power of a heater for cooling the battery according to the power difference or adjusting the flow of cooling liquid of a circulation branch loop of the battery to increase the heating power of the battery. If the temperature regulation required power P1 of a certain battery is less than or equal to the temperature regulation actual power P2 corresponding to the battery, the power of the heater is reduced or kept unchanged, or the flow of the cooling liquid of the circulation branch loop of the battery is regulated and reduced, so that the heating power of the battery is reduced.
Specifically, when in the heating mode, P1 and P2 of each battery are acquired, respectively, and judged. If P1 of one of the batteries is larger than P2, the temperature rise of the battery cannot be completed within the target time according to the current heating power or the current cooling liquid flow, so the power difference between P1 and P2 of the battery is obtained, and the power of a heater for heating the battery is increased according to the power difference, or the cooling liquid flow of the circulation branch loop of the battery is increased by adjusting the rotating speed of a corresponding pump, so that the temperature of the battery can be adjusted within the target time t. Wherein the larger the difference between P1 and P2, the more the power of the heater is increased. If P1 of a certain battery is less than or equal to P2, the power of the heater can be reduced appropriately to save electric energy, or the flow of the cooling liquid of the circulation branch loop of the battery is reduced by adjusting the rotating speed of the corresponding pump to reduce the heating power, or the power of the heater is kept unchanged. When the temperature of all the batteries is higher than a preset temperature, for example, 10 ℃, the heating of the batteries is completed, information for turning off the temperature adjusting function is sent to the vehicle-mounted air conditioner through the CAN communication, and the heaters are controlled to be turned off. If the temperature of the battery is still below 10 c after the temperature regulating system enters the heating mode for a long time, for example, after 1 hour, the power of the heater is increased appropriately so that the battery is heated as soon as possible.
According to an embodiment of the present invention, the temperature adjustment method of the vehicle-mounted battery may further include: if the temperature regulation required power P1 of a certain battery is smaller than the corresponding temperature regulation actual power P2, reducing the rotation speed of a pump in the flow path of the battery; if the temperature regulation required power P1 of a certain battery is greater than the corresponding temperature regulation actual power P2, the rotation speed of the pump in the flow path of the battery is increased.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if P1 of a certain battery is less than P2, the rotation speed of the corresponding pump is controlled to be reduced to save electric energy. And if the P1 of a certain battery is larger than the P2, the controller controls the power of the corresponding heater or compressor to be increased or the flow rate of the cooling liquid of the loop where the battery is positioned to be increased, and controls the rotating speed of the pump to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, the temperature of the battery is adjusted to be actually P2, and the temperature adjustment is realized within the target time t.
According to an embodiment of the present invention, when the plurality of batteries are connected in series and the flow path is connected in series, the plurality of batteries correspond to a plurality of pumps that regulate the flow rate of the coolant of the batteries, and the pumps are bidirectional pumps.
As shown in fig. 19A-20, taking the battery as 2 as an example, when the battery is one (the first battery and the second battery) and is connected in series, the number of the pumps is 2, and one of the two pumps is a forward pump and one is a reverse pump.
As shown in fig. 19A, when the forward pump is started, the flow direction of the coolant in the second pipe is: medium container-heat exchanger-heater-positive pump-first temperature sensor-first battery-second temperature sensor-flow rate sensor-medium container. As shown in fig. 19B, when the reverse pump is activated, the flow direction of the coolant in the second pipe is: medium container-flow rate sensor-second temperature sensor-second battery-first temperature sensor-reverse pump-heater-heat exchanger-medium container.
When the cooling function of the first battery and the second battery is started, if the temperature of the first battery is higher than that of the second battery and the difference value exceeds a preset value, the forward pump is controlled to work, so that cooling liquid flows through the first battery firstly and then flows through the second battery, and the first battery is cooled as soon as possible. And if the temperature of the second battery is higher than that of the first battery and the difference value exceeds a preset value, controlling the reverse pump to work so that the cooling liquid flows through the second battery firstly and then flows through the first battery, and thus the second battery is cooled as soon as possible. Thus, by changing the flow direction of the coolant, the temperature difference between the first battery and the second battery can be reduced. And when the cooling function and the heating function of the first battery and the second battery are not started, if the temperature difference between the first battery and the second battery exceeds a preset value, the forward pump or the reverse pump can be controlled to be started so as to enable the cooling liquid in the battery cooling branch to flow, and therefore the temperatures of the first battery and the second battery are balanced.
In order to make the present invention more clearly understood by those skilled in the art, the operation of the temperature regulation system of the vehicle-mounted battery is described below with reference to specific examples.
The main difference between fig. 19A and fig. 14A is the addition of a compressor refrigeration circuit, while increasing the temperature equalization of the in-vehicle air conditioner outlet and the power regulation problem between the compressors. Only the differences are listed below, and the others are not described below.
As shown in fig. 19A, when the temperature regulation system enters the cooling mode, the controller separately obtains P1 of each battery, the actual temperature regulation power P2 of each battery, and the maximum cooling power P of the single compressor, and adds P1 of each battery to calculate the total temperature regulation required power P of the entire temperature regulation systemZThe total temperature-controlled actual power Pf is obtained by adding the temperature-controlled actual powers P2 of the respective batteries, and the sum P5 of the maximum cooling powers of all the compressors is calculated by adding the maximum cooling powers of the respective compressors. P51 is the maximum refrigeration capacity of the compressor 11, P52 is the maximum refrigeration capacity of the compressor 12, P5 is the sum of the maximum refrigeration capacities of all the compressors, and P5 is P51+ P52. The temperature regulation required power of the first battery is P11, and the temperature regulation required power of the second battery is P12. The temperature-regulated actual power of the first battery 61 is P21, and the temperature-regulated actual power of the second battery 62 is P22.
If Pz is less than or equal to P51, only one compressor is controlled to work to provide refrigerating power, and two compressors can be controlled to work together. If P51 < Pz ≦ P5, two compressors are required to work together, and the initial cooling power of each compressor may be Pz/2, or other power combinations, so that the sum of the cooling power of the 2 compressors is Pz. If Pz > P5, two compressors are required to work together, each compressor operating at maximum refrigeration capacity. The power required for temperature regulation of the in-vehicle cooling branch is P4, i.e., P4 is the power required for regulating the in-vehicle temperature to the set temperature.
When the in-vehicle cooling and the battery cooling are simultaneously started, it is assumed that the temperatures of the areas of the air outlet 1 and the air outlet 2 are T51, and the temperatures of the areas of the air outlet 3 and the air outlet 4 are T52.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment is carried out:
if Pz + P4 is less than or equal to P5, the refrigeration power of the first compressor 11 is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the first compressor is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the second compressor is controlled to be increased, and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the T51 temperature is reduced rapidly, the cooling power requirement of the battery is met, and the.
If Pz + P4 is more than P5, the first compressor and the second compressor are controlled to operate at the maximum refrigerating power, the opening degree of an expansion valve of a battery cooling circuit in a first compressor refrigerating circuit is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in a second compressor refrigerating circuit is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, the T51 temperature is reduced rapidly, meanwhile, the cooling power requirement of a battery is met, and the in-vehicle environment temperature balance is achieved.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment can be carried out:
and controlling the closing of a battery cooling circuit in the first compressor refrigeration circuit and controlling the opening degree of an expansion valve of the in-vehicle cooling circuit to be increased, so that all the refrigeration power of the first compressor is used for in-vehicle cooling. And meanwhile, the expansion valve of the battery cooling loop in the second compressor refrigeration loop is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling loop is controlled to be reduced, and the cooling power of the battery is increased, so that the temperature of T51 is accelerated to be reduced, the cooling power requirement of the battery is met, and the in-vehicle environment temperature balance is realized.
The main difference between fig. 20 and fig. 9 is the addition of a compressor refrigeration circuit, while increasing the temperature equalization of the in-vehicle air conditioner outlet and the power regulation problem between the compressors. Only the differences are listed below, and the others are not described below.
As shown in fig. 20, when the temperature regulation system enters the cooling mode, the controller obtains P1 of each battery 6, the temperature regulation actual power P2 of each battery, and the maximum cooling power P of a single compressor, respectively, and adds P1 of each battery to calculate the total temperature regulation required power Pz of the entire temperature regulation system, adds the temperature regulation actual power P2 of each battery to obtain the total temperature regulation actual power Pf, and adds the maximum cooling power of each compressor to calculate the sum P5 of the maximum cooling powers of all the compressors. P51 is the maximum refrigeration capacity of the compressor 11, P52 is the maximum refrigeration capacity of the compressor 12, P5 is the sum of the maximum refrigeration capacities of all the compressors, and P5 is P51+ P52. The temperature regulation required power of the first battery 61 is P11, and the temperature regulation required power of the second battery 62 is P12. The temperature-regulated actual power of the first battery 61 is P21, and the temperature-regulated actual power of the second battery 62 is P22.
If Pz is less than or equal to P51, only one compressor 1 is controlled to work to provide refrigerating power, and two compressors 1 can also be controlled to work together. If P51 < Pz ≦ P5, two compressors are required to work together, and the initial cooling power of each compressor may be Pz/2, or other power combinations, so that the sum of the cooling power of the 2 compressors is Pz. If Pz > P5, two compressors are required to work together, each compressor operating at maximum refrigeration capacity. The power required for temperature regulation of the in-vehicle cooling branch is P4, i.e., P4 is the power required for regulating the in-vehicle temperature to the set temperature.
When the in-vehicle cooling and the battery cooling are simultaneously started, it is assumed that the temperatures of the areas of the air outlet 1 and the air outlet 2 are T51, and the temperatures of the areas of the air outlet 3 and the air outlet 4 are T52.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment is carried out:
if Pz + P4 is not more than P5, the refrigeration power of the first compressor 11 is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the T51 temperature is accelerated to be reduced, the cooling power requirement of the battery is met, and the.
If Pz + P4 is more than P5, the first compressor 11 and the second compressor 12 are controlled to operate at the maximum refrigerating power, meanwhile, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or simultaneously, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the temperature T51 is reduced rapidly, meanwhile, the requirement of the cooling power of the battery is met, and.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment can be carried out:
the closing of the battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be increased so that all the refrigeration power of the first compressor 11 is used for in-vehicle cooling. Meanwhile, the expansion valve of the battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, and the cooling power of the battery is increased, so that the temperature of T51 is accelerated to be reduced, the cooling power requirement of the battery is met, and the in-vehicle environment temperature balance is realized.
According to the temperature adjusting method of the vehicle-mounted battery, the required power for adjusting the temperature of the plurality of batteries in the plurality of battery cooling branches is firstly obtained respectively, then the regional temperature and the set temperature of the air conditioner in the plurality of regions in the vehicle are obtained respectively, and then the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigerating branches are adjusted according to the required power for adjusting the temperature, the actual power for adjusting the temperature, the plurality of regional temperatures and the set temperature of the air conditioner. Therefore, the method distributes the cooling capacity of the batteries and the cooling capacity of each area in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, and not only can adjust the temperature when the temperature of the batteries is too high or too low to maintain the temperature of the batteries in a preset range, but also can balance the temperature of each area in the carriage.
When there are a plurality of batteries and the plurality of batteries are provided independently, as shown in fig. 24, the temperature adjustment system for the vehicle-mounted battery includes: a plurality of refrigeration branches, a plurality of in-vehicle cooling branches, a plurality of battery cooling branches, and a battery temperature adjustment module 5.
Wherein each refrigeration branch comprises a compressor 1 and a condenser 2 connected with the compressor 1. The plurality of in-vehicle cooling branches are respectively connected with the plurality of refrigeration branches. A plurality of battery cooling branch roads link to each other with a plurality of refrigeration branch roads, communicate each other between a plurality of battery cooling branch roads. The battery temperature adjusting module 5 is respectively connected with the plurality of batteries and the plurality of battery cooling branches, and is configured to obtain a temperature adjustment required power P1 and a temperature adjustment actual power P2, obtain zone temperatures Tq and air conditioner set temperatures Ts of a plurality of zones in the vehicle, adjust the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigeration branches according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the plurality of zone temperatures Tq and the air conditioner set temperatures Ts, and adjust the opening degrees of the refrigeration amounts provided by the plurality of compressors 1 to the battery cooling branches corresponding to the batteries according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the batteries.
The battery can be a battery pack or a battery module.
Further, according to an embodiment of the present invention, the battery temperature adjustment module 5 adjusts the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of cooling branches for the target time t according to the temperature-adjustment required power P1, the temperature-adjustment actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts to reach the target temperature. For example, as shown in fig. 24, taking two cooling branches, two battery cooling branches, two in-vehicle cooling branches, and two batteries as an example, the batteries are a first battery 61 and a second battery 62, and the first battery 61 and the second battery 62 are provided independently of each other. The refrigeration branch is respectively a first refrigeration branch 11 and a second refrigeration branch 12, the battery cooling branch is respectively a first battery cooling branch 401 and a second battery cooling branch 402, and the in-vehicle cooling branch is respectively a first in-vehicle cooling branch 301 and a second in-vehicle cooling branch 302.
When the temperature of the first battery 61 and/or the second battery 62 is too high/low, temperature adjustment of the first battery 61 and/or the second battery 62 is required. The battery temperature adjusting module 5 obtains a temperature adjustment required power P1 and a temperature adjustment actual power P2, adjusts the opening degree of a plurality of battery cooling branches according to P1 and P2 to adjust the cooling power of the battery, and the battery temperature adjusting module 5 obtains a plurality of zone temperatures Tq and an air conditioner set temperature Ts, and controls the opening degree of each battery cooling branch according to Tq and Ts, for example, if the Tq of a certain zone is higher and the difference between the Tq of other zones is larger, the battery temperature adjusting module 5 controls the opening degree of an in-vehicle cooling branch for cooling the zone to be increased, and controls the opening degree of a corresponding battery cooling branch to be decreased, and at the same time, to ensure that the cooling power of the battery is not changed, the battery temperature adjusting module 5 controls the opening degree of another in-vehicle cooling branch to be decreased. Therefore, the system distributes the cooling capacity of the batteries and the cooling capacity of each area in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, and can regulate the temperature when the temperature of the batteries is too high or too low so as to maintain the temperature of the batteries in a preset range and balance the temperature of each area in the carriage. Meanwhile, because the battery cooling branches are communicated with each other, the battery temperature adjusting module 5 can ensure the balance of the temperature among the batteries by adjusting the refrigerating capacity opening degree of the battery cooling branch corresponding to the battery according to the temperature of each battery.
It can be understood that the refrigeration power of the battery temperature regulation module 5 is provided by the vehicle-mounted air conditioner and shares the refrigeration capacity with the refrigeration system in the vehicle, so that the volume of the temperature regulation system can be reduced, and the distribution of the flow of the cooling liquid is more flexible.
According to an embodiment of the present invention, as shown in fig. 24, the battery cooling branch may include a heat exchanger 41, and the heat exchanger 41 includes a first pipe and a second pipe, the second pipe is connected to the battery temperature adjusting module 5, the first pipe is communicated with the compressor 1, wherein the first pipe and the second pipe are independently disposed adjacent to each other.
The battery temperature adjustment module 5 includes: a flow path (not specifically shown) for regulating the temperature of the battery, the flow path being provided in the battery. A pump 51, a medium container 52, a heater 53, and a controller (not specifically shown in the drawings) connected between the flow path and the heat exchanger 41. The controller obtains the temperature regulation required power P1 of the battery and the temperature regulation actual power P2 of the battery, and regulates the temperature of the battery according to the temperature regulation required power P1 and the temperature regulation actual power P2. The in-vehicle cooling branch may include: an evaporator 31, a first expansion valve 32, and a first electronic valve 33. The battery cooling branch 4 may further include a second expansion valve 42 and a second electronic valve 43.
As shown in fig. 24, the first battery cooling branch 401 may further include a first regulating valve 411 and a third regulating valve 413; the second battery cooling branch 402 may further include a second regulating valve 412 and a fourth regulating valve 414, and the connection manner of the regulating valves may specifically refer to fig. 24, which is not described herein. As shown in fig. 24, the cooling capacity of each compressor 1 can be distributed to the first battery cooling branch 401 or the second battery cooling branch 402 by adjusting the first to fourth adjusting valves 411 and 414. For example, the compressor 1 of the first cooling branch 11 may distribute the refrigerant to the first battery cooling branch 401 by the first regulating valve 411, and distribute the refrigerant to the second battery cooling branch 402 by the second regulating valve 412. The compressor 1 in the second cooling branch 12 may distribute the refrigerant to the first battery cooling branch 401 by the third regulating valve 413, and distribute the refrigerant to the second battery cooling branch 402 by the fourth regulating valve 414.
According to an embodiment of the present invention, as shown in fig. 24, the cell temperature adjusting module 5 may further include a first temperature sensor 55 disposed at an inlet of the flow path, a second temperature sensor 56 disposed at an outlet of the flow path, and a flow rate sensor 57. It will be appreciated that the inlet and outlet positions of the flow path are not absolute, but rather are determined by the direction of rotation of the pump 51.
Specifically, the heat exchanger 41 may be a plate heat exchanger, and the plate heat exchanger may be installed inside the vehicle-mounted air conditioner, so that the whole refrigerant loop is inside the vehicle-mounted air conditioner, the vehicle-mounted air conditioner is convenient to factory debug, and the vehicle-mounted air conditioner can supply and assemble separately, and meanwhile, the vehicle-mounted air conditioner only needs to be filled with the refrigerant once in the installation process. The cooling liquid flows into the battery from the inlet of the flow path and flows out from the outlet of the flow path, so that heat exchange between the battery and the cooling liquid is realized.
The pump 51 is primarily used to provide power, and the media container 52 is primarily used to store and receive coolant to the temperature regulation system, and the coolant in the media container 52 can be automatically replenished when the coolant in the temperature regulation system is reduced. The heater 53 may be a PTC heater, may be in CAN communication with a controller, and provides heating power to the temperature regulation system of the vehicle battery, and is controlled by the controller. And the heater 53 is not directly contacted with the battery 6, so that the safety, the reliability and the practicability are higher.
The first temperature sensor 55 is used to detect the temperature of the cooling fluid at the inlet of the flow path, and the second temperature sensor 56 is used to detect the temperature of the cooling fluid at the outlet of the flow path. The flow rate sensor 57 is used to detect information on the flow rate of the cooling liquid in the corresponding pipe. The second electronic valve 43 is used to control the opening and closing of the corresponding battery cooling branch 4, and the second expansion valve 42 is used to control the flow rate of the coolant in the corresponding battery cooling branch 4. The controller can simultaneously control the flow of the cooling liquid in the two cooling branch circuits of the first battery 61 and the second battery 62 by adjusting the opening degrees of the first to fourth adjusting valves 411 and 414, thereby equalizing the temperatures of the two batteries. Meanwhile, the controller CAN also be in CAN communication with the vehicle-mounted air conditioner and the heater 53, CAN control the rotating speed of the pump 51 and monitor the temperature and flow information of the cooling liquid, CAN manage the battery, detect the voltage and temperature information of the battery, control the on-off of a temperature adjusting system of the vehicle-mounted battery, and CAN be in mutual communication with each other.
How each battery temperature adjustment module 5 obtains the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the corresponding battery 6 is described below in conjunction with the specific embodiment.
According to an embodiment of the present invention, the controller may be configured to respectively obtain a first parameter at the time of turning on the temperature adjustment of each battery, and generate a first temperature adjustment required power of each battery according to the first parameter, and respectively obtain a second parameter at the time of temperature adjustment of each battery, and generate a second temperature adjustment required power of each battery according to the second parameter, and generate a temperature adjustment required power P1 of each battery according to the first temperature adjustment required power of each battery and the second temperature adjustment required power of each battery.
Further, according to an embodiment of the present invention, the first parameter is an initial temperature and a target temperature at the time of battery on-temperature adjustment andfrom a target time T when the initial temperature reaches the target temperature, the controller obtains a first temperature difference Delta T between the initial temperature and the target temperature1And according to the first temperature difference DeltaT1And the target time t generates the first temperature regulation required power.
Further, the controller generates the first temperature regulation required power by the following formula (1):
ΔT1*C*M/t (1),
Wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
The second parameter is the average current I of each battery in the preset time, and the controller generates a second temperature regulation required power through the following formula (2):
I2*R, (2),
wherein I is the average current and R is the internal resistance of the battery.
When the battery is cooled, P1 ═ Δ T1*C*M/t+I2R; when the battery is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, the controller generates the second temperature difference Δ T of each cell according to the inlet temperature detected by the first temperature sensor 55 and the outlet temperature detected by the second temperature sensor 56 of the circuit in which each cell is located, respectively2And according to the second temperature difference DeltaT of each battery2And the flow rate v detected by the flow rate sensor 57 generates the temperature-adjusted actual power P2 for each cell.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
Specifically, after the vehicle is powered on, the controller determines whether the vehicle needs to be temperature-regulated, and if it is determined that the vehicle needs to be temperature-regulated, the controller turns on the temperature regulation function and sends low-speed information to the pump 51, and the pump starts to operate at a default speed (e.g., low speed). Then, the controller obtains an initial temperature (i.e. a current temperature), a target temperature and a target time t from the initial temperature to the target temperature of each battery, wherein the target temperature and the target time t can be preset according to actual conditions, and calculates a first temperature regulation required power of each battery according to formula (1). Meanwhile, the controller respectively obtains the average current I of each battery in the preset time, and calculates the second temperature regulation required power of each battery according to the formula (2). Then, the controller calculates a temperature adjustment required power P1 (i.e., a required power for adjusting the temperature of the battery to a target temperature for a target time) based on the first temperature adjustment required power and the second temperature adjustment required power of each battery 6, respectively. The controller acquires temperature information detected by the first temperature sensor 55 and the second temperature sensor 56 provided corresponding to each battery, acquires flow rate information detected by the flow rate sensor 57, and calculates the temperature-adjusted actual power P2 for each battery according to equation (3).
How to adjust the opening degrees of the plurality of in-vehicle cooling branches (31 and 32), the plurality of battery cooling branches (401 and 402), and the plurality of refrigeration branches (11 and 12) according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts will be described below with reference to specific embodiments.
According to an embodiment of the present invention, the controller may be configured to generate the total temperature adjustment required power P according to the temperature adjustment required power P1 of each batteryZJudging the total temperature regulation demand power PZWhether it is greater than the total maximum refrigerating power P5 of the plurality of compressors, wherein the required power P is adjusted when the total temperature is adjustedZWhen the total maximum refrigerating power P5 of the compressors is larger than the total maximum refrigerating power P5 of the compressors, the controller adjusts the opening degree of the refrigerating capacity of the battery cooling branch 4 corresponding to the batteries from the compressors 1 to the maximum; when the total temperature is regulated to the required power PZLess than or equal to the total maximum refrigerating power of the plurality of compressorsP5, the controller adjusts the required power P according to the total temperatureZThe difference from the total maximum cooling power P5 adjusts the cooling capacity opening degree of the battery cooling branch 4 corresponding to the battery 6.
Specifically, as shown in fig. 24, when cooling the batteries, the controller may calculate the total temperature adjustment required power P1 of the entire temperature adjustment system from the temperature adjustment required power P1 of each battery ZThat is, the total temperature regulation required power P is obtained by adding the temperature regulation required power P1 of each batteryZMeanwhile, the controller calculates the total maximum refrigerating power P5 of the plurality of compressors according to the maximum refrigerating power P of each compressor 1, that is, the total maximum refrigerating power P5 can be obtained by adding the maximum refrigerating power P of each compressor 1. Then, the controller judges whether P is presentZP5, if yes, the controller controls to adjust the opening degree of each second expansion valve 42 to the maximum to increase the inflow to each cell; the flow rate of the cooling liquid in the cooling loop 4 enables the battery to be cooled within the target time. And if PZP5, two compressors are required to work together, the initial refrigeration power of each compressor can be Pz/2, or other power combination forms, so that the sum of the refrigeration power of the 2 compressors is Pz, and the P isZThe difference between P5, where P is the opening degree of each second expansion valve 42ZThe larger the absolute value of the difference from P5, the smaller the opening degree of the second expansion valve 42, so as to achieve the purpose of saving energy.
According to an embodiment of the present invention, as shown in fig. 24, the controller is further configured to detect the temperatures of the plurality of batteries, and control the temperature adjustment system to enter the cooling mode when the temperature of any one of the plurality of batteries 6 is greater than a first temperature threshold, and control the temperature adjustment system to enter the heating mode when the temperature of any one of the plurality of batteries is less than a second temperature threshold. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the controller detects the temperature of each battery in real time and makes a judgment. If the temperature of one of the batteries is higher than 40 ℃, which indicates that the temperature of the battery is too high at this time, in order to avoid the influence of the high temperature on the performance of the battery, the temperature of the battery needs to be reduced, the controller controls the temperature adjusting system to enter a cooling mode, sends a battery cooling function starting message to the air conditioning system, and controls the corresponding second electronic valve 43 to be opened so that the cooling liquid exchanges heat with the battery to reduce the temperature of the battery.
If the temperature of a certain battery is lower than 0 ℃, which indicates that the temperature of the battery is too low at this time, in order to avoid the influence of low temperature on the performance of the battery, the temperature of the battery needs to be raised, and the controller controls the temperature regulation system to enter a heating mode, controls the second electronic valve 43 to be closed, and controls the corresponding heater 53 to be opened to provide heating power for the temperature regulation system. When the temperature regulation system operates in the heating mode, the heater 53 provides heating power to heat the first battery 61, for example, the flow direction of the cooling liquid in the loop of the first battery 61 is: the medium container 52, the heat exchanger 41, the heater 53 (on), the pump 51, the first temperature sensor 55, the first battery 61, the second temperature sensor 56, the flow rate sensor 57 and the medium container 52 are cycled, and the temperature rise of the first battery 61 of the battery is realized.
According to an embodiment of the present invention, as shown in fig. 24, when the cooling mode is selected, the controller is further configured to determine whether the battery temperature is greater than a third temperature threshold when the temperature adjustment demand power P1 of the battery cooling branch is greater than the temperature adjustment actual power P2, wherein if the battery temperature is greater than the third temperature threshold, the controller increases the opening degree of the corresponding battery cooling branch, wherein the opening degrees of the battery cooling branches are respectively controlled by corresponding valves (i.e., the second expansion valves 42), and the third temperature threshold is greater than the first temperature threshold, for example, the third temperature threshold may be 45 ℃.
Specifically, when in the cooling mode, if P1 is greater than P2, the controller determines whether the temperature of the battery is greater than 45 ℃. If the temperature of any one of the cells is greater than 45 c, which indicates that the temperature of the current cell is too high, the controller decreases the opening degree of the corresponding first expansion valve 32 to decrease the flow rate of the coolant of the cooling branch of the vehicle, while increasing the opening degree of the second expansion valve 42 to increase the flow rate of the coolant of the cooling branch of the cell. Therefore, the temperature of the battery can be adjusted within the target time when the temperature of the battery is overhigh by adjusting the refrigerating capacity distribution of the in-vehicle cooling branch and the battery cooling branch.
According to an embodiment of the present invention, as shown in fig. 24, in the cooling mode, the controller is further configured to obtain a power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2 when the temperature adjustment required power P1 of the certain battery is greater than the temperature adjustment actual power P2 of the battery, and increase the power of the compressor 1 for cooling of the battery according to the power difference, or adjust the flow rate of the cooling liquid of the circulation branch loop of the battery to increase the cooling power of the battery, or adjust the actual power P2 when the temperature adjustment required power P1 of the certain battery is less than or equal to the temperature of the battery to decrease the power of the compressor or keep the power of the compressor constant, or adjust the flow rate of the cooling liquid of the circulation branch loop of the battery to decrease the cooling power of the battery.
Specifically, when operating in the cooling mode, if there are a plurality of batteries, the controller acquires P1 and P2 of each battery, respectively, and makes a judgment. If the P1 of one of the batteries is greater than the P2, it indicates that if the temperature of the battery cannot be reduced within the target time according to the current cooling power or the current cooling liquid flow rate, therefore, the controller obtains the power difference between the P1 and the P2 of the battery, and increases the power of the compressor 1 according to the power difference, or increases the cooling liquid flow rate of the circulation branch loop of the battery to increase the cooling power of the battery, wherein the larger the power difference between the P1 and the P2, the more the power of the compressor 1 and the cooling liquid flow rate of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If the P1 of one of the batteries is less than or equal to P2, the power of the compressor 1 can be kept unchanged or the power of the compressor 1 can be properly reduced, or the flow of the cooling liquid in the circulation branch loop of the battery can be reduced, so that the cooling power of the battery can be reduced. When the temperature of all the batteries is lower than 35 ℃, the cooling of the batteries is completed, and the controller sends a message for turning off the temperature regulation function to the vehicle-mounted air conditioner through the CAN communication and controls the second electronic valve 43 to be closed. If the temperature of the battery is still higher than 35 ℃ after the temperature regulating system enters the cooling mode for a long time, for example, after 1 hour, the controller increases the power of the compressor appropriately so as to cool the battery as soon as possible.
According to an embodiment of the present invention, as shown in fig. 24, the controller is further configured to decrease the opening degrees of the plurality of in-vehicle cooling branches and increase the opening degrees of the plurality of battery cooling branches when the temperature of a certain battery is less than the third temperature threshold and the in-vehicle temperature is equal to the air conditioner set temperature Ts.
Specifically, when in the cooling mode, if the temperature of each battery is less than 45 ℃, the controller judges whether the temperature in the vehicle reaches the air conditioner set temperature Ts. If so, the controller decreases the opening degree of the first expansion valve 32 and increases the opening degree of the second expansion valve 42 to increase the flow rate of the cooling liquid in the cooling branch of the battery, decrease the flow rate of the cooling liquid in the cooling branch of the vehicle, and complete the cooling of the battery as soon as possible. And if the in-vehicle temperature does not reach the air-conditioning set temperature Ts, the cooling demand in the vehicle is preferentially satisfied, and the controller increases the opening degree of the first expansion valve 32 and decreases the opening degree of the second expansion valve 42.
In addition, the battery temperature is processed in a layered mode, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is reduced to 35 ℃, the battery cooling is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature-regulation required power P1 is greater than the temperature-regulation actual power P2, if the battery temperature does not exceed 45 ℃, the cooling demand in the vehicle is still prioritized, and if the cooling power in the vehicle is sufficient and reaches a balance, the controller increases the opening degree of the battery cooling branch to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
In an embodiment of the present invention, the plurality of refrigeration branches correspond to the plurality of air outlets, respectively, and the temperature of the plurality of zones is the temperature of the plurality of air outlets.
For example, as shown in fig. 21, 4 air outlets, air outlet 1-air outlet 4, may be disposed in the vehicle cabin. The corresponding zone temperature Tq is detected by detecting the tuyere temperature Tc. Suppose that the air outlet 1 and the air outlet 2 are provided with refrigeration power by the first refrigeration branch 11, and the air outlet 3 and the air outlet 4 are provided with refrigeration power by the second refrigeration branch 12.
According to an embodiment of the present invention, as shown in fig. 24, the controller is further configured to obtain a temperature difference between temperatures of the plurality of regions, and when the temperature difference is greater than a fourth temperature threshold, increase an opening degree of an in-vehicle cooling branch corresponding to the cooling branch where the air outlet with a high temperature is located, and decrease an opening degree of a battery cooling branch corresponding to the cooling branch where the air outlet with a high temperature is located. The fourth temperature threshold may be preset according to actual conditions, and may be, for example, 3 ℃.
Further, according to an embodiment of the present invention, the controller is further configured to reduce an opening degree of an in-vehicle cooling branch corresponding to the cooling branch where the air outlet with the low temperature is located, and increase an opening degree of a battery cooling branch corresponding to the cooling branch where the air outlet with the low temperature is located.
Specifically, in the battery cooling process, if the air conditioner needs to be started in the vehicle, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the vehicle is kept balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 21, when it is detected that the zone temperature Tq at the outlet port 1 and the outlet port 2 is higher than the zone temperature Tq in the vicinity of the outlet port 3 and the outlet port 4 by 3 ℃ or more, the opening degree of the first expansion valve 32 in the first in-vehicle cooling branch 301 is controlled to be increased, while the opening degree of the second expansion valve 42 in the first battery cooling branch 401 is controlled to be decreased, so that the cooling power in the first in-vehicle cooling branch 301 is increased. The controller also controls the opening degree of the first expansion valve 32 in the second in-vehicle cooling branch 302 to decrease and the opening degree of the second expansion valve 42 in the second battery cooling branch 402 to increase so that the cooling power in the second in-vehicle cooling branch 302 is smaller. Therefore, the cooling power of the first battery cooling circuit 301 and the second battery cooling circuit 302 is not changed, and the air temperature in the areas near the air outlets in the vehicle is balanced. When the vehicle-mounted air conditioner detects that the difference between the air temperatures Tq in the areas near the air outlet 1 and the air outlet 2 and the air temperatures Tq in the areas near the air outlet 3 and the air outlet 4 is within 3 ℃, the controller controls the opening degrees of the first expansion valves 32 in the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 to be the same so as to ensure that the cooling powers of the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 are the same.
According to an embodiment of the present invention, when the heating mode is selected, the controller obtains a power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2 when the temperature adjustment required power P1 of the certain battery is greater than the temperature adjustment actual power P2 of the battery, and increases the power of the heater for heating the battery according to the power difference, or adjusts the flow rate of the coolant for increasing the heating power of the battery, and decreases the power of the heater or keeps the power of the heater constant, or adjusts the flow rate of the coolant for decreasing the circulation branch circuit of the battery when the temperature adjustment required power P1 of the certain battery is less than or equal to the temperature adjustment actual power P2 of the battery, to decrease the heating power of the battery.
Specifically, when in the heating mode, the controller acquires P1 and P2 of each battery, respectively, and makes a judgment. If P1 of one of the batteries is greater than P2, it indicates that the temperature rise of the battery cannot be completed within the target time according to the current heating power or cooling liquid flow, so the controller obtains the power difference between P1 and P2 of the battery, and increases the power of the heater 53 for heating the battery according to the power difference, or increases the cooling liquid flow of the circulation branch loop of the battery by adjusting the corresponding increase of the rotation speed of the pump 51, so that the battery can complete the temperature adjustment within the target time t. Wherein the larger the difference between P1 and P2, the more the power of the heater 53 is increased. If P1 of a certain battery is less than or equal to P2, the controller can reduce the power of the heater 53 to save electric energy, or reduce the flow rate of the coolant in the circulation branch loop of the battery by adjusting the corresponding reduction of the rotation speed of the pump 51 to reduce the heating power, or keep the power of the heater 53 unchanged. When the temperature of all the batteries is higher than a preset temperature, for example, 10 c, the battery heating is completed, and the controller transmits a message for turning off the temperature adjusting function to the in-vehicle air conditioner through CAN communication and controls the heater 53 to be turned off. If the battery temperature is still below 10 c after the thermostat system enters the heating mode for an extended period of time, such as 1 hour, the controller will again increase the power to the heater 53 appropriately to allow the battery to finish warming as quickly as possible.
According to an embodiment of the present invention, the controller is further configured to decrease the rotation speed of the pump 51 in the battery flow path when the temperature adjustment required power P1 of the certain battery is less than the corresponding temperature adjustment actual power P2, and increase the rotation speed of the pump 51 in the battery flow path when the temperature adjustment required power P1 of the certain battery is greater than the corresponding temperature adjustment actual power P2.
Specifically, when the thermostat system enters the heating mode or the cooling mode, if P1 of a certain battery is less than P2, the controller controls the rotational speed of the corresponding pump 51 to be reduced to save electric power. If the P1 of a certain battery is greater than the P2, the controller controls the power of the corresponding heater 53 or compressor 1 to be increased or the flow rate of the cooling liquid in the loop where the battery is located to be increased, and controls the rotating speed of the pump 51 to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, and the temperature adjustment actual power P2 of the battery is increased, so that the temperature adjustment can be realized within the target time t.
It is understood that when the temperature adjusting system is operated in the cooling mode, as shown in fig. 24, the controller may calculate the temperature adjustment required powers P1 of the first and second batteries 61 and 62, respectively, and then adjust the opening degree of the corresponding second expansion valve 42 according to the P1 of each battery and the maximum cooling power P of the corresponding compressor, respectively. During the cooling process, the controller also adjusts the actual power P2 according to the temperature of each battery to continuously adjust the opening degree of the second expansion valve 42. Meanwhile, the controller adjusts the flow distribution of the cooling liquid of the first battery cooling branch 401 and the second battery cooling branch 402 by adjusting the opening degree of the first to fourth adjusting valves 411 and 414 according to the temperature condition between the first battery 61 and the second battery 62, thereby achieving the balance of controlling the temperature of the first battery 61 and the second battery 62. Wherein, when the temperature of the first battery 61 is higher than the temperature of the second battery 62 and the difference exceeds the set value, the opening degrees of the first and third regulating valves 411 and 413 may be increased, and the opening degrees of the second and fourth regulating valves 412 and 414 may be decreased to increase the cooling power of the first battery 61; when the temperatures of the first cell 61 and the second cell 62 are equal, the opening degrees of the first to fourth regulating valves 411 and 414 may be controlled to be the same. When the temperature adjusting system is operated in the heating mode, the controller increases the heating power of the heater 53 corresponding to the first battery 61 when the temperature of the first battery 61 is lower than the temperature of the second battery 62 and the difference value exceeds the set value. Thereby, the temperature balance between the two batteries can be maintained.
In order to make the present invention more clearly understood by those skilled in the art, the operation of the temperature regulation system of the vehicle-mounted battery is described below with reference to specific examples.
Fig. 24 adds an in-vehicle cooling circuit as compared to the temperature regulation system shown in fig. 11A-11B. Only the differences are listed below, and the others are not described below.
As shown in fig. 24, when the battery, the in-vehicle cooling circuit 3, the battery cooling circuit 4 are plural, and the plural batteries are independently provided, when the temperature adjusting system enters the cooling mode, the controller separately obtains P1 of each battery 6, the temperature adjusting actual power P2 of each battery, and the maximum cooling power P of the single compressor, and adds P1 of each battery to calculate the total temperature adjusting required power P of the entire temperature adjusting systemZThe total temperature-controlled actual power Pf is obtained by adding the temperature-controlled actual powers P2 of the respective batteries, and the sum P5 of the maximum cooling powers of all the compressors is calculated by adding the maximum cooling powers of the respective compressors. The temperature regulation required power of the first battery 61 is P11, and the temperature regulation required power of the second battery 62 is P12. The temperature-regulated actual power of the first battery 61 is P21, and the temperature-regulated actual power of the second battery 62 is P22. P51 is the maximum cooling capacity of the first compressor 11, and P52 is the maximum cooling capacity of the second compressor 12.
If Pz is less than or equal to P51, only one compressor 1 is controlled to work to provide refrigerating power, and two compressors 1 can also be controlled to work together. If P51 < Pz P5, two compressors 1 are required to work together, each compressor having an initial cooling power Pz/2, or other power combinations, so that the sum of the cooling powers of the 2 compressors is Pz. If Pz > P5, each compressor is operated at maximum cooling power.
When the in-vehicle cooling and the battery cooling are simultaneously started, assuming that the temperatures of the areas of the air outlet 1 and the air outlet 2 are T51 and the temperatures of the areas of the air outlet 3 and the air outlet 4 are T52, the following judgments are made:
if T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment is carried out:
if Pz + P4 is not more than P5, the refrigeration power of the first compressor 11 is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or the opening degree of an expansion valve of a battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the T51 temperature is accelerated to be reduced, the cooling power requirement of the battery is met, and the.
If Pz + P4 is more than P5, the first compressor 11 and the second compressor 12 are controlled to operate at the maximum refrigerating power, meanwhile, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or simultaneously, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the temperature T51 is reduced rapidly, meanwhile, the requirement of the cooling power of the battery is met, and.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment can be carried out:
the closing of the battery cooling circuit in the refrigeration circuit of the first compressor 11 is controlled and the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be increased so that all the refrigeration power of the first compressor 11 is used for in-vehicle cooling. Meanwhile, the expansion valve of the battery cooling circuit in the refrigeration circuit of the second compressor 12 is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, and the cooling power of the battery is increased, so that the temperature of T51 is accelerated to be reduced, the cooling power requirement of the battery is met, and the in-vehicle environment temperature balance is realized.
In summary, according to the temperature adjustment system for the vehicle-mounted battery in the embodiment of the present invention, the battery temperature adjustment module is used to obtain the required temperature adjustment power and the actual temperature adjustment power, obtain the zone temperatures and the set air conditioner temperatures of the plurality of zones in the vehicle, adjust the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the required temperature adjustment power, the actual temperature adjustment power, the plurality of zone temperatures, and the set air conditioner temperatures, and adjust the opening degrees of the cooling capacities provided by the plurality of compressors to the battery cooling branches corresponding to the battery according to the required temperature adjustment power and the actual temperature adjustment power of the battery. Therefore, the system distributes the cooling capacity of the batteries and all areas in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the batteries is too high or too low to maintain the temperature of the batteries in a preset range, and can balance the temperature of all areas in the carriage and the temperature among all the batteries.
When the temperature adjustment system of the on-vehicle battery includes a plurality of cooling branches and a plurality of battery cooling branches corresponding to the plurality of cooling branches, a plurality of in-vehicle cooling branches, a plurality of batteries, and a plurality of battery temperature adjustment modules connected between the plurality of batteries and the plurality of battery cooling branches, as shown in fig. 25, the temperature adjustment method of the on-vehicle battery includes the steps of:
s1', respectively obtaining the temperature regulation required power P1 and the temperature regulation actual power P2 of the plurality of batteries.
According to an embodiment of the present invention, the respectively obtaining the power required for temperature adjustment of the plurality of batteries specifically includes: the method comprises the steps of respectively obtaining a first parameter when the temperature of each battery is started to be adjusted, and generating first temperature adjustment required power of each battery according to the first parameter. And respectively acquiring a second parameter of each battery during temperature adjustment, and generating a second temperature adjustment required power of each battery according to the second parameter. The temperature regulation required power P1 of the battery cooling branch is generated according to the first temperature regulation required power and the second temperature regulation required power of each battery.
Further, according to an embodiment of the present invention, the first parameters are an initial temperature and a target temperature at which the battery is opened for temperature adjustment and a target time t from the initial temperature to the target temperature, and the generating the first temperature adjustment required power according to the first parameters specifically includes: a first temperature difference Delta T between an initial temperature and a target temperature is obtained 1(ii) a According to the first temperature difference Delta T1And the target time t generates the first temperature regulation required power.
Still further, according to an embodiment of the present invention, the first temperature regulation required power is generated by the following formula (1):
ΔT1*C*M/t, (1)
wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
According to an embodiment of the present invention, the second parameter is an average current I of the battery for a preset time, and the second temperature regulation required power is generated by the following formula (2):
I2*R, (2)
wherein I is the average current and R is the internal resistance of the battery.
When the battery is cooled, P1 ═ Δ T1*C*M/t+I2R; when the battery is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, obtaining the temperature-regulated actual power P2 of the plurality of batteries specifically includes: the inlet temperature and the outlet temperature of a flow path for adjusting the temperatures of a plurality of cells are acquired, and the flow velocity v of the coolant flowing into the flow path is acquired. Generating a second temperature difference Δ T of the plurality of cells according to the inlet temperature and the outlet temperature of the flow path of the plurality of cells2. According to a second temperature difference Delta T of multiple batteries2And the flow rate v generates a temperature regulated actual power P2 for the plurality of cells.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is further generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
And S2' ″, respectively acquiring the zone temperature Tq and the air-conditioning set temperature Ts of a plurality of zones in the vehicle.
And S3' adjusting the opening degree of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigeration branches according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the plurality of zone temperatures Tq and the air conditioner set temperature Ts. The battery cooling branches are communicated with each other, and the refrigerating capacity opening degree provided by the plurality of compressors to the battery cooling branch corresponding to the battery is adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the battery.
Further, according to an embodiment of the present invention, the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of cooling branches are adjusted to reach the target temperature within the target time t according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts.
The battery can be a battery pack or a battery module. Each cell is independently arranged.
Specifically, for example, the refrigeration branch, the battery cooling branch, the in-vehicle cooling branch and the battery are two, the battery is a first battery and a second battery respectively, the refrigeration branch is a first refrigeration branch and a second refrigeration branch respectively, the battery cooling branch is a first battery cooling branch and a second battery cooling branch respectively, and the in-vehicle cooling branch loop is a first in-vehicle cooling branch and a second in-vehicle cooling branch respectively.
When the temperature of the first battery and/or the second battery is too high/too low, temperature regulation of the first battery and/or the second battery is required. The method comprises the steps of obtaining required temperature regulation power P1 and actual temperature regulation power P2, regulating the opening degree of a plurality of battery cooling branches according to P1 and P2 to regulate the cooling power of batteries, obtaining a plurality of zone temperatures Tq and set air conditioner temperatures Ts, and controlling the opening degree of each battery cooling branch according to the Tq and the Ts, wherein for example, if the Tq of a certain zone is higher and the Tq of other zones is different greatly, the opening degree of an in-vehicle cooling branch for cooling the zone is controlled to be increased, the opening degree of a corresponding battery cooling branch is controlled to be decreased, meanwhile, the opening degree of another in-vehicle cooling branch is controlled to be decreased, and the opening degree of a corresponding battery cooling branch is controlled to be increased to ensure that the cooling power of the batteries is unchanged. Therefore, the method distributes the cooling capacity of the batteries and the cooling capacity of each area in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, and not only can adjust the temperature when the temperature of the batteries is too high or too low to maintain the temperature of the batteries in a preset range, but also can balance the temperature of each area in the carriage. Meanwhile, because the battery cooling branches are communicated with each other, the balance of the temperature among the batteries can be ensured by adjusting the refrigerating capacity opening degree of the battery cooling branch corresponding to the battery according to the temperature of each battery.
How to adjust the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts will be described below with reference to specific embodiments.
According to an embodiment of the present invention, when the on-board battery is multiple and is independently disposed, and the in-vehicle cooling branch, the battery cooling branch, and the cooling branch are multiple, the method for adjusting the temperature of the on-board battery may further include: generating a total temperature-regulation required power P from the temperature-regulation required power P1 of each batteryZ. Generating a total maximum refrigerating power P5 of the plurality of compressors according to the maximum refrigerating power P of the plurality of compressors. Judging the total temperature regulation demand power PZWhether it is greater than the total maximum cooling power P5 of the plurality of compressors. Regulating the required power P if the total temperature is adjustedZGreater than the total maximum refrigeration capacity P5 of the plurality of compressors,and adjusting the opening degree of the refrigerating capacity of the battery cooling branch corresponding to the battery by the plurality of compressors to the maximum. Regulating the required power P if the total temperature is adjustedZLess than or equal to the total maximum refrigerating power P5 of the compressors, and regulating the required power P according to the total temperature ZAnd the difference between the total maximum refrigerating power P5 and the refrigerating capacity opening degree of the battery cooling branch corresponding to the battery is adjusted.
Specifically, the total temperature regulation required power P of the entire temperature regulation system may be calculated from the temperature regulation required power P1 of each batteryZThat is, the total temperature regulation required power P is obtained by adding the temperature regulation required power P1 of each batteryZMeanwhile, the total maximum refrigerating power P5 of the plurality of compressors is calculated according to the maximum refrigerating power P of each compressor, namely the total maximum refrigerating power P5 can be obtained by adding the maximum refrigerating power P of each compressor. Then, it is judged whether P is presentZAnd if so, controlling to adjust the opening degree of each second expansion valve to be maximum so as to adjust the flow of the cooling liquid of the plurality of compressors to the battery cooling branch corresponding to the battery to be maximum, so that the battery can be cooled within the target time t. And if PZP5 or less, according to PZThe difference between P5, where P is the opening degree of the second expansion valveZThe larger the absolute value of the difference value with the P5 is, the smaller the opening degree of the second expansion valve is, so as to achieve the purpose of saving energy.
According to an embodiment of the present invention, the temperature adjustment method of the battery may further include the steps of: the temperatures of the plurality of batteries are detected. Entering a cooling mode when the temperature of any one of the plurality of batteries is greater than a first temperature threshold. And entering a heating mode when the temperature of any battery in the plurality of batteries is less than a second temperature threshold value. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the temperature of each battery is detected in real time and is judged. If the temperature of one of the batteries is higher than 40 ℃, the temperature of the battery is over high at the moment, and in order to avoid the influence of the high temperature on the performance of the battery, the battery needs to be cooled, enters a cooling mode, and sends a battery cooling function starting message to an air conditioning system. If the temperature of a certain battery is lower than 0 ℃, the temperature of the battery is too low at the moment, so that the battery needs to be subjected to temperature rise treatment to avoid the influence of low temperature on the performance of the battery, and the battery enters a heating mode, a corresponding battery cooling branch is controlled to be closed, and a heater is controlled to be opened to provide heating power for the battery.
According to an embodiment of the present invention, when the cooling mode is selected, adjusting the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the temperature regulation required power P1, the temperature regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts specifically includes: when the temperature adjustment required power P1 of the battery cooling branch is greater than the temperature adjustment actual power P2, it is determined whether the battery temperature is greater than a third temperature threshold, wherein if the battery temperature is greater than the third temperature threshold, the controller decreases the opening degrees of the plurality of in-vehicle cooling branches and increases the opening degrees of the plurality of battery cooling branches, wherein the opening degrees of the plurality of battery cooling branches are respectively controlled by corresponding valves (i.e., second expansion valves), and the third temperature threshold is greater than the first temperature threshold, for example, the third temperature threshold may be 45 ℃.
Specifically, when in the cooling mode, if P1 is greater than P2, it is determined whether the temperature of the battery is greater than 45 ℃. If the temperature of any one of the cells is greater than 45 c, which indicates that the temperature of the current cell is too high, the opening degree of the first expansion valve 32 is decreased to decrease the flow rate of the cooling liquid of the cooling branch of the vehicle, while the opening degree of the second expansion valve 42 is increased to increase the flow rate of the cooling liquid of the cooling branch of the cell. Therefore, the temperature of the battery can be adjusted within the target time when the temperature of the battery is overhigh by adjusting the refrigerating capacity distribution of the in-vehicle cooling branch and the battery cooling branch.
According to an embodiment of the present invention, the method for adjusting the temperature of the battery in the cooling mode further includes: and judging whether the temperature regulation required power P1 of each battery is larger than the temperature regulation actual power P2 corresponding to each battery. If the temperature regulation required power P1 of a certain battery is greater than the temperature regulation actual power P2 of the battery, a power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2 is acquired, and the power of a compressor for cooling the battery is increased according to the power difference, or the flow of coolant of a circulation branch loop of the battery is adjusted to be increased to increase the cooling power of the battery. If the temperature regulation required power P1 of a certain battery is less than or equal to the temperature regulation actual power P2 of the battery, the power of the compressor is reduced or kept unchanged, or the flow of the cooling liquid of the circulation branch loop of the battery is regulated and reduced, so that the cooling power of the battery is reduced.
Specifically, when operating in the cooling mode, if there are a plurality of batteries, P1 and P2 of each battery are acquired, respectively, and judgment is made. If the P1 of one battery is larger than the P2, the battery cannot be cooled within the target time according to the current refrigerating power or the current cooling liquid flow, so the power difference between the P1 and the P2 of the battery is obtained, the power of the compressor is increased according to the power difference, or the cooling liquid flow of the circulation branch loop of the battery is increased to increase the cooling power of the battery, wherein the larger the power difference between the P1 and the P2 is, the more the power of the compressor and the cooling liquid flow of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If P1 of one of the batteries is less than or equal to P2, the power of the compressor can be kept unchanged or reduced appropriately, or the flow of the cooling liquid of the circulation branch loop of the battery is reduced, so that the cooling power of the battery is reduced. When the temperature of all the batteries is lower than 35 ℃, the batteries are cooled, the information for closing the temperature adjusting function is sent to the vehicle-mounted air conditioner through CAN communication, and the second electronic valve is controlled to be closed. If the temperature of the battery is still higher than 35 ℃ after the temperature regulating system enters the cooling mode for a long time, for example, after 1 hour, the power of the compressor is appropriately increased so that the temperature of the battery is reduced as soon as possible.
According to one embodiment of the invention, if the battery temperature is less than the third temperature threshold, further judging whether the in-vehicle temperature is equal to the air conditioner set temperature Ts; and if the in-vehicle temperature is equal to the set air conditioner temperature Ts, reducing the opening degree of the plurality of in-vehicle cooling branches and increasing the opening degree of the plurality of battery cooling branches.
Specifically, when in the cooling mode, if the temperature of each battery is less than 45 ℃, the controller judges whether the temperature in the vehicle reaches the air conditioner set temperature Ts. And if so, increasing the flow of the cooling liquid of the battery cooling branch, reducing the flow of the cooling liquid of the cooling branch in the vehicle, and cooling the battery as soon as possible. And if the temperature in the vehicle does not reach the set temperature Ts of the air conditioner, the refrigeration requirement in the vehicle is preferentially met, the controller increases the flow of the cooling liquid of the cooling branch in the vehicle and reduces the flow of the cooling liquid of the battery cooling branch.
In addition, the battery temperature is processed in a layered mode, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is reduced to 35 ℃, the battery cooling is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature regulation required power P1 is greater than the temperature regulation actual power P2, if the battery temperature does not exceed 45 ℃, the cooling demand in the vehicle is still prioritized, and if the cooling power in the vehicle is already sufficient and reaches a balance, the opening degree of the battery cooling branch is increased to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
According to an embodiment of the present invention, reducing the opening degree of the plurality of in-vehicle cooling branches specifically includes: temperature differences between the temperatures of the plurality of zones are obtained. And judging whether the temperature difference is larger than a fourth temperature threshold value. And if the temperature difference is greater than the fourth temperature threshold value, increasing the opening degree of the in-vehicle cooling branch corresponding to the refrigeration branch where the air outlet with the high temperature is located, and reducing the opening degree of the battery cooling branch corresponding to the refrigeration branch where the air outlet with the high temperature is located. The fourth temperature threshold may be preset according to actual conditions, and may be, for example, 3 ℃.
Further, according to an embodiment of the present invention, the temperature adjustment method of the vehicle-mounted battery further includes: and the opening degree of the in-vehicle cooling branch corresponding to the refrigeration branch where the air outlet with the low temperature is located is reduced, and the opening degree of the battery cooling branch corresponding to the refrigeration branch where the air outlet with the low temperature is located is improved.
Specifically, in the battery cooling process, if the air conditioner needs to be started in the vehicle, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the vehicle is kept balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 21, when it is detected that the zone temperature Tq at the outlet port 1 and the outlet port 2 is higher than the zone temperature Tq in the vicinity of the outlet port 3 and the outlet port 4 by 3 ℃ or more, the opening degree in the first in-vehicle cooling branch passage is increased, and the opening degree in the first battery cooling branch passage is decreased, so that the cooling power in the first in-vehicle cooling branch passage is made larger. The cooling opening degree in the second in-vehicle cooling branch is also decreased, and the opening degree of the second battery cooling branch is increased, so that the cooling power in the second in-vehicle cooling branch is smaller. Therefore, the cooling power of the first battery cooling branch and the cooling power of the second battery cooling branch are not changed, and the air temperatures of areas near the air outlets in the vehicle are balanced. When the vehicle-mounted air conditioner detects that the difference between the air temperature Tq of the area near the air outlet 1 and the air outlet 2 and the air temperature Tq of the area near the air outlet 3 and the air outlet 4 is within 3 ℃, the opening degrees of the first expansion valves in the first vehicle internal cooling branch and the second vehicle internal cooling branch are controlled to be the same, so that the cooling powers of the first vehicle internal cooling branch and the second vehicle internal cooling branch are guaranteed to be the same.
According to an embodiment of the present invention, when the heating mode is selected, the method further includes: it is determined whether the temperature regulation required power P1 of a certain battery is greater than the temperature regulation actual power P2 of the battery. If the temperature regulation required power P1 of a certain battery is larger than the temperature regulation actual power P2 corresponding to the battery, acquiring the power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2, and increasing the power of a heater for cooling the battery according to the power difference or adjusting the flow of cooling liquid of a circulation branch loop of the battery to increase the heating power of the battery. If the temperature regulation required power P1 of a certain battery is less than or equal to the temperature regulation actual power P2 corresponding to the battery, the power of the heater is reduced or kept unchanged, or the flow of the cooling liquid of the circulation branch loop of the battery is regulated and reduced, so that the heating power of the battery is reduced.
Specifically, when in the heating mode, P1 and P2 of each battery are acquired, respectively, and judged. If P1 of one of the batteries is larger than P2, the temperature rise of the battery cannot be completed within the target time according to the current heating power or the current cooling liquid flow, so the power difference between P1 and P2 of the battery is obtained, and the power of a heater for heating the battery is increased according to the power difference, or the cooling liquid flow of the circulation branch loop of the battery is increased by adjusting the rotating speed of a corresponding pump, so that the temperature of the battery can be adjusted within the target time t. Wherein the larger the difference between P1 and P2, the more the power of the heater is increased. If P1 of a certain battery is less than or equal to P2, the power of the heater can be reduced appropriately to save electric energy, or the flow of the cooling liquid of the circulation branch loop of the battery is reduced by adjusting the rotating speed of the corresponding pump to reduce the heating power, or the power of the heater is kept unchanged. When the temperature of all the batteries is higher than a preset temperature, for example, 10 ℃, the heating of the batteries is completed, information for turning off the temperature adjusting function is sent to the vehicle-mounted air conditioner through the CAN communication, and the heaters are controlled to be turned off. If the temperature of the battery is still below 10 c after the temperature regulating system enters the heating mode for a long time, for example, after 1 hour, the power of the heater is increased appropriately so that the battery is heated as soon as possible.
According to an embodiment of the present invention, the temperature adjustment method of the in-vehicle battery may further include: if the temperature regulation required power P1 of a certain battery is smaller than the corresponding temperature regulation actual power P2, reducing the rotation speed of a pump in the flow path of the battery; if the temperature regulation required power P1 of a certain battery is greater than the corresponding temperature regulation actual power P2, the rotation speed of the pump in the flow path of the battery is increased.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if P1 of a certain battery is less than P2, the rotation speed of the corresponding pump is controlled to be reduced to save electric energy. And if the P1 of a certain battery is larger than the P2, the controller controls the power of the corresponding heater or compressor to be increased or the flow rate of the cooling liquid of the loop where the battery is positioned to be increased, and controls the rotating speed of the pump to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, the temperature of the battery is adjusted to be actually P2, and the temperature adjustment is realized within the target time t.
Fig. 24 adds an in-vehicle cooling circuit as compared to the temperature regulation system shown in fig. 11A-11B. Only the differences are listed below, and the others are not described below.
As shown in fig. 24, when the battery, the in-vehicle cooling circuit, and the battery cooling circuit are plural, and the plural batteries are independently provided, when the temperature adjusting system enters the cooling mode, the controller separately obtains P1 of each battery, the temperature adjusting actual power P2 of each battery, and the maximum cooling power P of the single compressor, and adds P1 of each battery to calculate the total temperature adjusting required power P of the entire temperature adjusting system ZThe total temperature-controlled actual power Pf is obtained by adding the temperature-controlled actual powers P2 of the respective batteries, and the sum P5 of the maximum cooling powers of all the compressors is calculated by adding the maximum cooling powers of the respective compressors. The temperature regulation required power of the first battery is P11, and the temperature regulation required power of the second battery is P12. The temperature-regulated actual power of the first battery is P21, and the temperature-regulated actual power of the second battery is P22. P51 is the maximum cooling capacity of the first compressor 11, and P52 is the maximum cooling capacity of the second compressor.
If Pz is less than or equal to P51, only one compressor is controlled to work to provide refrigerating power, and two compressors can be controlled to work together. If P51 < Pz ≦ P5, two compressors are required to work together, each with an initial refrigeration power Pz/2, or other power combinations such that the sum of the refrigeration powers of the 2 compressors is Pz. If Pz > P5, each compressor is operated at maximum cooling power.
When the in-vehicle cooling and the battery cooling are simultaneously started, assuming that the temperatures of the areas of the air outlet 1 and the air outlet 2 are T51 and the temperatures of the areas of the air outlet 3 and the air outlet 4 are T52, the following judgments are made:
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment is carried out:
and if the Pz + P4 is less than or equal to P5, controlling the refrigerating power of the first compressor to be increased, or controlling the opening degree of an expansion valve of a battery cooling circuit in the refrigerating circuit of the first compressor to be reduced, and controlling the opening degree of an expansion valve of an in-vehicle cooling circuit to be increased, or simultaneously controlling the opening degree of an expansion valve of a battery cooling circuit in the refrigerating circuit of the second compressor to be increased, and controlling the opening degree of an expansion valve of an in-vehicle cooling circuit to be reduced, so that the T51 temperature is reduced rapidly, the cooling power requirement of the battery is met, and the ambient.
If Pz + P4 is more than P5, the first compressor 11 and the second compressor 12 are controlled to operate at the maximum refrigerating power, meanwhile, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the first compressor 11 is controlled to be reduced, the opening degree of an expansion valve of an in-vehicle cooling circuit is controlled to be increased, or simultaneously, the opening degree of an expansion valve of a battery cooling circuit in a refrigerating circuit of the second compressor is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling circuit is controlled to be reduced, so that the temperature T51 is reduced rapidly, meanwhile, the requirement of the cooling power of a battery is met, and.
If T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment can be carried out:
And controlling the closing of a battery cooling circuit in the first compressor refrigeration circuit and controlling the opening degree of an expansion valve of the in-vehicle cooling circuit to be increased, so that all the refrigeration power of the first compressor is used for in-vehicle cooling. And meanwhile, the expansion valve of the battery cooling loop in the second compressor refrigeration loop is controlled to be increased, the opening degree of the expansion valve of the in-vehicle cooling loop is controlled to be reduced, and the cooling power of the battery is increased, so that the temperature of T51 is accelerated to be reduced, the cooling power requirement of the battery is met, and the in-vehicle environment temperature balance is realized.
According to the temperature adjusting method of the vehicle-mounted battery, the required power for temperature adjustment and the actual power for temperature adjustment of the plurality of batteries are respectively obtained, then the regional temperatures and the set temperatures of the air conditioner of the plurality of regions in the vehicle are respectively obtained, and the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigeration branches are adjusted according to the required power for temperature adjustment, the actual power for temperature adjustment, the temperatures of the plurality of regions and the set temperature of the air conditioner. Therefore, the method distributes the cooling capacity of the batteries and the cooling capacity of each area in the carriage according to the actual state of each battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the batteries is too high or too low to maintain the temperature of the batteries in a preset range, and can balance the temperature of each area in the carriage and the temperature among the batteries.
When the battery is one, and refrigeration branch road, the interior cooling branch road of car and battery cooling branch road are a plurality of, on-vehicle battery's temperature governing system includes: a plurality of refrigeration branches, a plurality of in-vehicle cooling branches, a plurality of battery cooling branches, and a battery temperature adjustment module 5.
As shown in fig. 26, each refrigeration branch includes a compressor 1 and a condenser 2 connected to the compressor 1. The plurality of in-vehicle cooling branches are respectively connected with the plurality of refrigeration branches. The battery temperature adjusting module 5 is connected with the battery 6 and the battery cooling branch, and is configured to obtain a temperature adjustment required power P1 and a temperature adjustment actual power P2, obtain a zone temperature Tq and an air conditioner set temperature Ts of a plurality of zones in the vehicle, and adjust the power of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the plurality of zone temperatures Tq, and the air conditioner set temperature Ts.
The battery can be a battery pack or a battery module.
Further, according to an embodiment of the present invention, the battery temperature adjustment module 5 adjusts the power of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of cooling branches for the target time t according to the temperature-adjusted required power P1, the temperature-adjusted actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts to reach the target temperature. When the temperature of the battery is too high or too low, the battery needs to be temperature-regulated. The battery temperature adjusting module 5 obtains the temperature adjusting demand power P1 and the temperature adjusting actual power P2 of the battery 6, adjusts the opening degrees of a plurality of battery cooling branches according to P1 and P2 to adjust the cooling power of the battery, and the battery temperature adjusting module 5 obtains a plurality of zone temperatures Tq and air conditioner setting temperatures Ts, and controls the opening degree of each battery cooling branch according to Tq and Ts, for example, if the Tq of a certain zone is higher and the difference between the Tq of other zones is larger, the battery temperature adjusting module 5 controls the opening degree of an in-vehicle cooling branch for cooling the zone to be increased and controls the opening degree of a corresponding battery cooling branch to be decreased, and at the same time, to ensure that the cooling power of the battery is not changed, the battery temperature adjusting module 5 controls the opening degree of another in-vehicle cooling branch to be decreased and controls the opening degree of the corresponding battery cooling branch to be increased. Therefore, the system distributes the refrigerating capacity of the battery and each area in the carriage according to the actual state of the battery, the temperatures of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the battery is too high or too low, enables the temperature of the battery to be maintained in a preset range, and can balance the temperature of each area in the carriage.
It can be understood that the refrigeration power of the battery temperature regulation module 5 is provided by the vehicle-mounted air conditioner and shares the refrigeration capacity with the refrigeration system in the vehicle, so that the volume of the temperature regulation system can be reduced, and the distribution of the flow of the cooling liquid is more flexible.
According to one embodiment of the invention, the battery cooling branch may comprise a heat exchanger 41, the heat exchanger 41 being connected to the battery temperature regulating module 5. The heat exchanger 41 may include a first pipe connected to the battery temperature adjusting module 5 and a second pipe communicated with the compressor 1, wherein the first pipe and the second pipe are independently disposed adjacent to each other. The battery temperature adjustment module 5 includes: a flow path (not specifically shown) for regulating the temperature of the battery, the flow path being provided in the battery. A pump 51, a medium container 52, a heater 53, and a controller (not specifically shown in the drawings) connected between the flow path and the heat exchanger 41. The controller obtains the temperature regulation required power P1 of the battery and the temperature regulation actual power P2 of the battery, and regulates the temperature of the battery according to the temperature regulation required power P1 and the temperature regulation actual power P2. The in-vehicle cooling branch may include: an evaporator 31, a first expansion valve 32, and a first electronic valve 33. The battery cooling branch 4 may further include a second expansion valve 42 and a second electronic valve 43.
Specifically, the heat exchanger 41 may be a plate heat exchanger, and the plate heat exchanger may be installed inside the vehicle-mounted air conditioner, so that the whole refrigerant loop is inside the vehicle-mounted air conditioner, the vehicle-mounted air conditioner is convenient to factory debug, and the vehicle-mounted air conditioner can supply and assemble separately, and meanwhile, the vehicle-mounted air conditioner only needs to be filled with the refrigerant once in the installation process. The cooling liquid flows into the battery from the inlet of the flow path and flows out from the outlet of the flow path, so that heat exchange between the battery and the cooling liquid is realized.
The pump 51 is primarily used to provide power, and the media container 52 is primarily used to store and receive coolant to the temperature regulation system, and the coolant in the media container 52 can be automatically replenished when the coolant in the temperature regulation system is reduced. The heater 53 may be a PTC heater, may be in CAN communication with a controller, and provides heating power to the temperature regulation system of the vehicle battery, and is controlled by the controller. And the heater 53 is not directly contacted with the battery 6, so that the safety, the reliability and the practicability are higher.
The first temperature sensor 55 is used to detect the temperature of the cooling fluid at the inlet of the flow path, and the second temperature sensor 56 is used to detect the temperature of the cooling fluid at the outlet of the flow path. The flow rate sensor 57 is used to detect information on the flow rate of the cooling liquid in the corresponding pipe. The second electronic valve 43 is used to control the opening and closing of the corresponding battery cooling branch, and the second expansion valve 42 is used to control the flow of coolant in the corresponding battery cooling branch.
How to obtain the temperature regulation required power P1 and the temperature regulation actual power P2 is described below with reference to specific embodiments.
According to an embodiment of the present invention, the controller may be configured to respectively obtain a first parameter when the battery is turned on for temperature adjustment and generate a first temperature adjustment required power of the battery according to the first parameter, and respectively obtain a second parameter when the battery is temperature adjusted and generate a second temperature adjustment required power of the battery according to the second parameter, and generate a temperature adjustment required power P1 of the battery according to the first temperature adjustment required power of the battery and the second temperature adjustment required power of the battery.
Further, according to an embodiment of the present invention, the firstThe controller obtains a first temperature difference delta T between an initial temperature and a target temperature1And according to the first temperature difference DeltaT1And the target time t generates the first temperature regulation required power.
Further, the controller generates the first temperature regulation required power by the following formula (1):
ΔT1*C*M/t(1),
wherein, Delta T1Is a first temperature difference between the initial temperature and the target temperature, t is the target time, C is the specific heat capacity of the battery 6, and M is the mass of the battery.
The second parameter is the average current I of the battery in the preset time, and the controller generates a second temperature regulation required power through the following formula (2):
I2*R, (2),
where I is the average current and R is the internal resistance of the battery 6.
When cooling battery 6, P1 ═ Δ T1*C*M/t+I2R; when the battery 6 is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, the controller generates the second temperature difference Δ T of the battery according to the inlet temperature detected by the first temperature sensor 55 and the outlet temperature detected by the second temperature sensor 56, respectively2And according to the second temperature difference DeltaT of the battery2And the flow rate v detected by the flow rate sensor 57 generates the temperature-regulated actual power P2 of the battery.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, and m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, and ρ is the density of the cooling liquid.
Specifically, as shown in fig. 26, after the vehicle is powered on, the controller determines whether the battery 6 needs to be temperature-adjusted, and if it is determined that the battery 6 needs to be temperature-adjusted, the controller turns on the temperature adjustment function and sends a low rotation speed message to the pump 51, and the pump starts to operate at a default rotation speed (e.g., a low rotation speed). The controller can obtain the initial temperature (namely the current temperature) of the 6 batteries, the target temperature and the target time t for reaching the target temperature from the initial temperature, wherein the target temperature and the target time t can be preset according to actual conditions, and the first temperature regulation required power of the 6 batteries is calculated according to the formula (1). Meanwhile, the controller obtains the average current I of the battery 6 within a preset time, and calculates a second temperature regulation required power of the battery 6 according to formula (2). Then, the controller calculates a temperature regulation required power P1 based on the first and second temperature regulation required powers of the battery, respectively. The controller acquires temperature information detected by the first temperature sensor 55 and the second temperature sensor 56, acquires flow rate information detected by the flow rate sensors, and calculates the battery temperature adjustment actual power P2 according to equation (3).
How to adjust the opening degrees of the plurality of in-vehicle cooling branches (31 and 32), the plurality of battery cooling branches (401 and 402), and the plurality of refrigeration branches (11 and 12) according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts will be described below with reference to specific embodiments.
According to an embodiment of the present invention, the controller is further configured to generate a total maximum cooling power P5 of the plurality of compressors according to the maximum cooling power P of the plurality of compressors, and determine whether the temperature regulation demand power P1 is greater than the total maximum cooling power P5 of the plurality of compressors, wherein the controller adjusts the opening degree of the cooling capacity of the plurality of battery cooling branches to be maximum when the temperature regulation demand power P1 is greater than the total maximum cooling power P5 of the plurality of compressors; when the temperature regulation demand power P1 is less than or equal to the total maximum refrigerating power P5 of the plurality of compressors, the controller adjusts the refrigerating capacity opening degree of the battery cooling branch circuit according to the difference between the temperature regulation demand power P1 and the total maximum refrigerating power P5.
Specifically, as shown in fig. 26, the controller may calculate a total maximum cooling power P5 of the plurality of compressors according to the maximum cooling power P of each compressor, that is, the total maximum cooling power P5 may be obtained by adding the maximum cooling powers P of each compressor. Then, the controller determines whether P1 > P5, and if so, the controller adjusts the opening degree of each second expansion valve 42 to the maximum to adjust the flow rate of the coolant to the battery cooling branch corresponding to the batteries of the plurality of compressors 1 to the maximum so that the batteries 6 can be cooled within the target time t. And if the P1 is less than or equal to the P5, the controller adjusts the opening degree of the second expansion valve 42 according to the difference between the P1 and the P5, wherein the larger the absolute value of the difference between the P1 and the P5 is, the smaller the opening degree of the second expansion valve 42 is, so as to achieve the purpose of saving energy.
According to an embodiment of the invention, the controller is further configured to detect a temperature of the battery and control the temperature adjustment system to enter the cooling mode when the temperature of the battery is greater than a first temperature threshold, and control the temperature adjustment system to enter the heating mode when the temperature of the battery is less than a second temperature threshold. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the controller detects the temperature of the battery in real time and makes a judgment. If the temperature of the battery is higher than 40 ℃, which indicates that the temperature of the battery 6 is too high at this time, in order to avoid the high temperature from affecting the performance of the battery 6, the temperature of the battery 6 needs to be reduced, the controller controls the temperature adjustment system to enter a cooling mode, sends a battery cooling function starting message to the air conditioning system, and controls the second electronic valve 43 to be opened, so that the cooling liquid exchanges heat with the battery to reduce the temperature of the battery.
And if the temperature of the battery is lower than 0 ℃, which indicates that the temperature of the battery 6 is too low at this time, in order to avoid the low temperature from affecting the performance of the battery, the temperature of the battery 6 needs to be raised, and the controller controls the temperature regulation system to enter a heating mode, controls the second electronic valve 43 to be closed, and controls the heater 53 to be opened to provide heating power for the temperature regulation system.
According to an embodiment of the present invention, when the cooling mode is selected, the controller is further configured to determine whether the battery temperature is greater than a third temperature threshold value when the temperature adjustment demand power P1 of the battery cooling branch is greater than the temperature adjustment actual power P2, wherein if the battery temperature is greater than the third temperature threshold value, the controller decreases the opening degrees of the plurality of in-vehicle cooling branches and increases the opening degrees of the plurality of battery cooling branches, wherein the opening degrees of the battery cooling branches are respectively controlled by corresponding valves (i.e., the second expansion valves 42), and the third temperature threshold value is greater than the first temperature threshold value, for example, the third temperature threshold value may be 45 ℃.
Specifically, when in the cooling mode, if P1 is greater than P2, the controller determines whether the temperature of the battery is greater than 45 ℃. If the temperature of the battery is greater than 45 c, which indicates that the temperature of the battery 6 is currently too high, the controller decreases the opening degree of the first expansion valve 32 to decrease the flow rate of the coolant of the cooling branch in the vehicle, while increasing the opening degree of the second expansion valve 42 to increase the flow rate of the coolant of the cooling branch of the battery. Therefore, the temperature of the battery can be adjusted within the target time when the temperature of the battery is overhigh by adjusting the refrigerating capacity distribution of the in-vehicle cooling branch and the battery cooling branch.
According to an embodiment of the present invention, in the cooling mode, the controller is further configured to obtain a power difference between the battery temperature adjustment required power P1 and the battery temperature adjustment actual power P2 when the battery temperature adjustment required power P1 is greater than the battery temperature adjustment actual power P2, and increase the power of the compressor 1 for cooling of the battery according to the power difference, or adjust the flow rate of the cooling liquid in the circulation branch circuit of the battery to increase the cooling power of the battery, or adjust the actual power P2 to decrease the power of the compressor or keep the power of the compressor constant when the battery temperature adjustment required power P1 is less than or equal to the battery temperature adjustment actual power P2, or adjust the flow rate of the cooling liquid in the circulation branch circuit of the battery to decrease the cooling power of the battery.
Specifically, when operating in the cooling mode, the controller acquires P1 and P2 of the battery 6, and makes a judgment. If P1 is greater than P2, it indicates that if the temperature of the battery 6 cannot be reduced within the target time according to the current cooling power or the current coolant flow, therefore, the controller obtains the power difference between P1 and P2 of the battery 6, and increases the power of the compressor 1 according to the power difference, or increases the coolant flow of the circulation branch loop of the battery to increase the cooling power of the battery, wherein the larger the power difference between P1 and P2 is, the more the power of the compressor and the coolant flow of the battery are increased, so that the temperature of the battery is reduced to the target temperature within the preset time t. If the P1 of the battery 6 is less than or equal to the P2, the power of the compressor can be kept unchanged or reduced appropriately, or the cooling power of the battery can be reduced by reducing the flow of the cooling liquid in the circulation branch loop of the battery. When the temperature of the battery is lower than 35 ℃, the battery cooling is completed, and the controller sends a message for turning off the temperature adjustment function to the vehicle-mounted air conditioner through the CAN communication and controls the second electronic valve 43 to be closed. If the temperature of the battery is still above 35 c after the thermostat has entered the cooling mode for a longer period of time, for example 1 hour, the controller then increases the power to the compressor appropriately to allow the battery 6 to finish cooling as soon as possible.
According to an embodiment of the invention, the controller is further configured to decrease the opening degrees of the plurality of in-vehicle cooling branches and increase the opening degrees of the plurality of battery cooling branches when the temperature of the battery is less than the third temperature threshold and the in-vehicle temperature is equal to the air conditioner set temperature Ts.
Specifically, when the cooling mode is selected, if the temperature of the battery is less than 45 ℃, the controller judges whether the temperature in the vehicle reaches the air conditioner set temperature Ts. If so, the controller decreases the opening degree of the first expansion valve 32 and increases the opening degree of the second expansion valve 42 to increase the flow rate of the cooling liquid in the cooling branch of the battery, decrease the flow rate of the cooling liquid in the cooling branch of the vehicle, and complete the cooling of the battery as soon as possible. And if the in-vehicle temperature does not reach the air-conditioning set temperature Ts, the cooling demand in the vehicle is preferentially satisfied, and the controller increases the opening degree of the first expansion valve 32 and decreases the opening degree of the second expansion valve 42.
In addition, the battery temperature is processed in a layered mode, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is reduced to 35 ℃, the battery cooling is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature-regulation required power P1 is greater than the temperature-regulation actual power P2, if the battery temperature does not exceed 45 ℃, the cooling demand in the vehicle is still prioritized, and if the cooling power in the vehicle is sufficient and reaches a balance, the controller increases the opening degree of the battery cooling branch to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
In an embodiment of the present invention, the plurality of refrigeration branches correspond to the plurality of air outlets, respectively, and the temperature of the plurality of zones is the temperature of the plurality of air outlets.
For example, as shown in fig. 21, 4 air outlets, air outlet 1-air outlet 4, may be disposed in the vehicle cabin. The corresponding zone temperature Tq is detected by detecting the tuyere temperature Tc. Suppose that the air outlet 1 and the air outlet 2 are provided with refrigeration power by the first refrigeration branch 11, and the air outlet 3 and the air outlet 4 are provided with refrigeration power by the second refrigeration branch 12.
According to an embodiment of the present invention, the controller is further configured to obtain a temperature difference between the temperatures of the plurality of regions, and when the temperature difference is greater than a fourth temperature threshold, increase an opening degree of an in-vehicle cooling branch corresponding to the cooling branch where the air outlet with a high temperature is located, and decrease an opening degree of a battery cooling branch corresponding to the cooling branch where the air outlet with a high temperature is located. The fourth temperature threshold may be preset according to actual conditions, and may be, for example, 3 ℃.
Further, according to an embodiment of the present invention, the controller is further configured to reduce an opening degree of an in-vehicle cooling branch corresponding to the cooling branch where the air outlet with the low temperature is located, and increase an opening degree of a battery cooling branch corresponding to the cooling branch where the air outlet with the low temperature is located.
Specifically, in the battery cooling process, if the air conditioner needs to be started in the vehicle, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the vehicle is kept balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 21, when it is detected that the zone temperature Tq at the outlet port 1 and the outlet port 2 is higher than the zone temperature Tq in the vicinity of the outlet port 3 and the outlet port 4 by 3 ℃ or more, the opening degree of the first expansion valve 32 in the first in-vehicle cooling branch 301 is controlled to be increased, while the opening degree of the second expansion valve 42 in the first battery cooling branch 401 is controlled to be decreased, so that the cooling power in the first in-vehicle cooling branch 301 is increased. The controller also controls the opening degree of the first expansion valve 32 in the second in-vehicle cooling branch 302 to decrease and the opening degree of the second expansion valve 42 in the second battery cooling branch 402 to increase so that the cooling power in the second in-vehicle cooling branch 302 is smaller. Therefore, the cooling power of the first battery cooling circuit 301 and the second battery cooling circuit 302 is not changed, and the air temperature in the areas near the air outlets in the vehicle is balanced. When the vehicle-mounted air conditioner detects that the difference between the air temperatures Tq in the areas near the air outlet 1 and the air outlet 2 and the air temperatures Tq in the areas near the air outlet 3 and the air outlet 4 is within 3 ℃, the controller controls the opening degrees of the first expansion valves 32 in the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 to be the same so as to ensure that the cooling powers of the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 are the same.
According to an embodiment of the present invention, when the heating mode is selected, the controller obtains a power difference between the temperature adjustment required power P1 of the battery and the temperature adjustment actual power P2 when the temperature adjustment required power P1 of the battery is greater than the temperature adjustment actual power P2 of the battery, and increases the power of the heater 53 for heating the battery according to the power difference, or adjusts the flow rate of the cooling liquid for increasing the heating power of the battery, and decreases the power of the heater 53 or keeps the power of the heater 53 constant, or adjusts the flow rate of the cooling liquid for decreasing the circulation branch circuit of the battery when the temperature adjustment required power P1 of the battery is less than or equal to the temperature adjustment actual power P2 of the battery, to decrease the heating power of the battery.
Specifically, when in the heating mode, the controller acquires P1 and P2 of the battery 6, and makes a judgment. If P1 is greater than P2, indicating that the temperature rise of the battery 6 cannot be completed within the target time if the current heating power or coolant flow rate is met, the controller obtains the power difference between P1 and P2 of the battery 6 and increases the power of the heater 53 for heating the battery 6 according to the power difference or increases the coolant flow rate of the circulation branch circuit of the battery by adjusting the rotational speed of the pump 51 so that the battery can complete the temperature adjustment within the target time t. Wherein the larger the difference between P1 and P2, the more the power of the heater 53 is increased. If the P1 of the battery 6 is less than or equal to P2, the controller can reduce the power of the heater 53 to save electric power, or reduce the flow rate of the coolant in the circulation branch circuit of the battery 6 by adjusting the rotation speed of the pump 51 to reduce the heating power, or keep the power of the heater 53 constant. When the temperature of the battery is higher than a preset temperature, for example, 10 c, the heating of the battery 6 is completed, and the controller transmits a message for turning off the temperature adjusting function to the in-vehicle air conditioner through CAN communication and controls the heater 53 to be turned off. If the temperature of the battery 6 remains below 10 c after the thermostat system enters the heating mode for a longer period of time, for example, 1 hour, the controller again increases the power to the heater 53 appropriately to allow the battery 6 to finish warming as quickly as possible.
According to an embodiment of the present invention, the controller is further configured to decrease the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is less than the corresponding temperature-regulation actual power P2, and increase the rotation speed of the pump 51 when the temperature-regulation required power P1 of the certain battery is greater than the corresponding temperature-regulation actual power P2.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if P1 of the battery 6 is less than P2, the controller controls the rotation speed of the pump 51 to be reduced to save electric power. And if the P1 of the battery 6 is larger than the P2, the controller controls the power of the corresponding heater 53 or the compressor 1 to be increased or the flow rate of the cooling liquid in the loop where the battery 6 is located to be increased, and controls the rotating speed of the pump 51 to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, and the temperature adjusting actual power P2 of the battery 6 is increased, so that the temperature adjustment is realized in the target time t.
It can be understood that the adjustment manner of the battery temperature adjustment module 5 of the system shown in fig. 26 is similar to that of fig. 19A-19B, and the difference is that a single battery pack in fig. 26, and 2 battery packs are connected in series in fig. 19A-19B.
According to the temperature adjusting system of the vehicle-mounted battery, the required temperature adjusting power and the actual temperature adjusting power are obtained through the battery temperature adjusting module, the zone temperatures and the set air conditioner temperatures of a plurality of zones in the vehicle are obtained, and the opening degrees of a plurality of in-vehicle cooling branches, a plurality of battery cooling branches and a plurality of refrigerating branches are adjusted according to the required temperature adjusting power, the actual temperature adjusting power, the zone temperatures and the set air conditioner temperatures. Therefore, the system distributes the refrigerating capacity of the battery and each area in the carriage according to the actual state of the battery, the temperatures of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the battery is too high or too low, enables the temperature of the battery to be maintained in a preset range, and can balance the temperature of each area in the carriage.
Fig. 27 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to an eleventh embodiment of the invention. As shown in fig. 26, the temperature adjustment system of the on-vehicle battery includes a plurality of refrigeration branches, a plurality of battery cooling branches corresponding to the plurality of refrigeration branches, a plurality of in-vehicle cooling branches, a battery, and a battery temperature adjustment module connected between the battery and the plurality of battery cooling branches, where each battery cooling branch includes a heat exchanger; as shown in fig. 27, the temperature adjustment method includes the steps of:
S1', respectively obtaining the temperature regulation required power P1 and the temperature regulation actual power P2 of the battery.
According to an embodiment of the present invention, the obtaining the power required for temperature adjustment of the battery specifically includes: the method comprises the steps of obtaining a first parameter when the temperature of the battery is adjusted, and generating a first temperature adjustment required power of the battery according to the first parameter. And acquiring a second parameter of the battery during temperature adjustment, and generating a second temperature adjustment required power of the battery according to the second parameter. And generating the temperature regulation demand power P1 of the battery cooling branch circuit according to the first temperature regulation demand power and the second temperature regulation demand power.
Further, according to an embodiment of the present invention, the first parameters are an initial temperature and a target temperature at which the battery is opened for temperature adjustment and a target time t from the initial temperature to the target temperature, and the generating the first temperature adjustment required power according to the first parameters specifically includes: a first temperature difference Delta T between an initial temperature and a target temperature is obtained1(ii) a According to the first temperature difference Delta T1And the target time t generates the first temperature regulation required power.
Still further, according to an embodiment of the present invention, the first temperature regulation required power is generated by the following formula (1):
ΔT1*C*M/t, (1)
Wherein, Delta T1Is a first temperature difference between an initial temperature and a target temperature, t is a target time, C is a specific heat capacity of the battery, and M is a mass of the battery.
According to an embodiment of the present invention, the second parameter is an average current I of the battery for a preset time, and the second temperature regulation required power is generated by the following formula (2):
I2*R, (2)
wherein I is the average current and R is the internal resistance of the battery.
When the battery is cooled, P1 ═ Δ T1*C*M/t+I2R; when the battery is heated, P1 ═ Δ T1*C*M/t-I2*R。
According to an embodiment of the present invention, the obtaining the temperature-regulated actual power P2 of the battery specifically includes: the inlet temperature and the outlet temperature of the flow path for adjusting the battery temperature are acquired, and the flow velocity v of the coolant flowing into the flow path is acquired. Generating a second temperature difference Δ T of the battery according to the inlet temperature and the outlet temperature of the flow path of the battery2. According to the second temperature difference Delta T of the battery2And the flow rate v generates a temperature regulated actual power P2 of the battery.
Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated according to the following formula (3):
ΔT2*c*m, (3)
wherein, Delta T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross section of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross section of the flow path.
And S2', respectively acquiring the zone temperature Tq and the air-conditioning set temperature Ts of a plurality of zones in the vehicle.
And S3', adjusting the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigeration branches according to the temperature adjustment required power P1, the temperature adjustment actual power P2, the plurality of zone temperatures Tq and the air conditioner set temperature Ts.
Further, according to an embodiment of the present invention, the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of cooling branches are adjusted to reach the target temperature within the target time t according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts.
The battery can be a battery pack or a battery module.
Specifically, for example, two refrigeration branches, a battery cooling branch, an in-vehicle cooling branch, and a battery are provided, where the refrigeration branches are a first refrigeration branch and a second refrigeration branch, the battery cooling branch is a first battery cooling branch and a second battery cooling branch, and the in-vehicle cooling branch loop is a first in-vehicle cooling branch and a second in-vehicle cooling branch.
When the temperature of the battery is too high or too low, the battery needs to be temperature-regulated. The method comprises the steps of obtaining required power P1 and actual power P2 for temperature regulation of batteries, regulating the opening degree of a plurality of battery cooling branches according to P1 and P2 to regulate the cooling power of the batteries, obtaining a plurality of zone temperatures Tq and set air conditioner temperatures Ts, and controlling the opening degree of each battery cooling branch according to the Tq and the Ts, wherein for example, if the Tq of a certain zone is higher and the Tq of other zones is different greatly, the opening degree of an in-vehicle cooling branch for cooling the zone is controlled to be increased, the opening degree of a corresponding battery cooling branch is controlled to be decreased, meanwhile, the opening degree of another in-vehicle cooling branch is controlled to be decreased, and the opening degree of a corresponding battery cooling branch is controlled to be increased to ensure that the cooling power of the batteries is unchanged. Therefore, the method distributes the cooling capacity of the battery and each area in the carriage according to the actual state of the battery, the temperature of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the battery is too high or too low, enables the temperature of the battery to be maintained in a preset range, and can balance the temperature of each area in the carriage.
Based on fig. 26, how to adjust the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the temperature-regulation required power P1, the temperature-regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts will be described below with reference to a specific embodiment.
According to an embodiment of the present invention, when there is one on-board battery and there are multiple in-vehicle cooling branches, battery cooling branches, and cooling branches, the method for adjusting the temperature of the on-board battery may further include: generating a total maximum refrigerating power P5 of the plurality of compressors according to the maximum refrigerating power P of the plurality of compressors. It is judged whether the temperature regulation demand power P1 is greater than the total maximum cooling power P5 of the plurality of compressors. And if the temperature regulation required power P1 is greater than the total maximum refrigerating power P5 of the plurality of compressors, adjusting the refrigerating capacity opening degree of the plurality of compressors to the battery cooling branch to the maximum. And if the temperature regulation required power P1 is less than or equal to the total maximum refrigerating power P5 of the plurality of compressors, adjusting the refrigerating capacity opening degree of the battery cooling branch corresponding to the battery according to the difference between the temperature regulation required power P1 and the total maximum refrigerating power P5.
Specifically, the total maximum cooling power P5 of the plurality of compressors may be calculated according to the maximum cooling power P of each compressor, that is, the total maximum cooling power P5 may be obtained by adding the maximum cooling powers P of each compressor. Then, whether P1 is greater than P5 is judged, and if so, the opening degree of the second expansion valve in each battery cooling branch is adjusted to be maximum, so that the flow of the cooling liquid of the plurality of compressors to the battery cooling branches corresponding to the batteries is adjusted to be maximum, and the batteries can be cooled within the target time t. And if the P1 is less than or equal to the P5, the opening degree of a second expansion valve in the battery cooling branch is adjusted according to the difference between the P1 and the P5, wherein the larger the absolute value of the difference between the P1 and the P5 is, the smaller the opening degree of the second expansion valve is, so that the aim of saving energy is fulfilled.
According to an embodiment of the present invention, the temperature adjustment method of the battery may further include the steps of: the temperature of the battery is detected. When the temperature of the battery is greater than a first temperature threshold, a cooling mode is entered. And entering a heating mode when the temperature of the battery is less than the second temperature threshold. The first temperature threshold and the second temperature threshold may be preset according to actual conditions, for example, the first temperature threshold may be 40 ℃, and the second temperature threshold may be 0 ℃.
Specifically, after the vehicle is powered on, the temperature of the battery is detected in real time and is judged. If the temperature of the battery is higher than 40 ℃, the temperature of the battery is over high at the moment, and in order to avoid the influence of the high temperature on the performance of the battery, the battery needs to be cooled, enters a cooling mode, and sends the start information of the cooling function of the battery to the air conditioning system. And if the temperature of the battery is lower than 0 ℃, the temperature of the battery is too low at the moment, so that the battery needs to be subjected to temperature rise treatment to enter a heating mode, a battery cooling branch is controlled to be closed, and a heater is controlled to be opened to provide heating power for the battery in order to avoid the influence of low temperature on the performance of the battery.
According to an embodiment of the present invention, when the cooling mode is selected, adjusting the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches, and the plurality of refrigeration branches according to the temperature regulation required power P1, the temperature regulation actual power P2, the plurality of zone temperatures Tq, and the air-conditioning set temperature Ts specifically includes: when the temperature adjustment required power P1 of the battery cooling branch is greater than the temperature adjustment actual power P2, determining whether the battery temperature is greater than a third temperature threshold, wherein if the battery temperature is greater than the third temperature threshold, the opening degrees of the plurality of in-vehicle cooling branches are decreased, and the opening degrees of the plurality of battery cooling branches are increased, wherein the opening degrees of the plurality of battery cooling branches are respectively controlled by corresponding valves (i.e., second expansion valves), and the third temperature threshold is greater than the first temperature threshold, for example, the third temperature threshold may be 45 ℃.
Specifically, when in the cooling mode, if P1 is greater than P2, it is determined whether the temperature of the battery is greater than 45 ℃. If the temperature of the battery is higher than 45 ℃, which indicates that the temperature of the battery is too high currently, the opening degree of the first expansion valve is decreased to decrease the flow rate of the cooling liquid of the cooling branch in the vehicle, and the opening degree of the second expansion valve 42 is increased to increase the flow rate of the cooling liquid of the cooling branch of the battery. Therefore, the temperature of the battery can be adjusted within the target time when the temperature of the battery is overhigh by adjusting the refrigerating capacity distribution of the in-vehicle cooling branch and the battery cooling branch.
According to an embodiment of the present invention, the temperature adjusting method of the battery further includes: it is determined whether the temperature regulation required power P1 of the battery is greater than the temperature regulation actual power P2. If the battery temperature regulation required power P1 is greater than the battery temperature regulation actual power P2, a power difference between the battery temperature regulation required power P1 and the battery temperature regulation actual power P2 is acquired, and the power of a compressor for cooling the battery is increased according to the power difference, or the flow rate of coolant in a circulation branch loop of the battery is adjusted to be increased to increase the cooling power of the battery. If the temperature regulation required power P1 of the battery is less than or equal to the temperature regulation actual power P2 of the battery, the power of the compressor is reduced or kept unchanged, or the flow of the cooling liquid of the circulation branch loop of the battery is reduced, so that the cooling power of the battery is reduced.
Specifically, when operating in the cooling mode, the P1 and P2 of the battery are respectively acquired and judged. If P1 is greater than P2, it is stated that if the battery temperature can not be reduced within the target time according to the current refrigeration power or cooling liquid flow, so, the power difference between P1 and P2 of the battery is obtained, and the power of the compressor is increased according to the power difference, or the cooling liquid flow of the circulation branch loop of the battery is increased, so as to increase the cooling power of the battery, wherein, the larger the power difference between P1 and P2 is, the more the power of the compressor and the cooling liquid flow of the battery are increased, so as to reduce the temperature of the battery to the target temperature within the preset time t. If the P1 of the battery is less than or equal to P2, the power of the compressor can be kept unchanged or reduced appropriately, or the flow of the cooling liquid of the circulation branch loop of the battery is reduced, so that the cooling power of the battery is reduced. When the temperature of the battery is lower than 35 ℃, the battery is cooled, the information for closing the temperature adjusting function is sent to the vehicle-mounted air conditioner through CAN communication, and the second electronic valve is controlled to be closed. If the temperature of the battery is still higher than 35 ℃ after the temperature regulating system enters the cooling mode for a long time, for example, after 1 hour, the power of the compressor is appropriately increased so that the temperature of the battery is reduced as soon as possible.
According to one embodiment of the invention, if the battery temperature is less than the third temperature threshold, further judging whether the in-vehicle temperature is equal to the air conditioner set temperature Ts; and if the in-vehicle temperature is equal to the set air conditioner temperature Ts, reducing the opening degree of the plurality of in-vehicle cooling branches and increasing the opening degree of the plurality of battery cooling branches.
Specifically, when the vehicle is in the cooling mode, if the temperatures of the batteries are all less than 45 ℃, the controller judges whether the temperature in the vehicle reaches the air conditioner set temperature Ts. And if so, increasing the flow of the cooling liquid of the battery cooling branch, reducing the flow of the cooling liquid of the cooling branch in the vehicle, and cooling the battery as soon as possible. And if the temperature in the vehicle does not reach the set temperature Ts of the air conditioner, the refrigeration requirement in the vehicle is preferentially met, the controller increases the flow of the cooling liquid of the cooling branch in the vehicle and reduces the flow of the cooling liquid of the battery cooling branch.
In addition, the battery temperature is processed in a layered mode, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the battery temperature is higher than 40 ℃, the battery cooling function is started, and when the battery temperature is reduced to 35 ℃, the battery cooling is completed. When the temperature of the battery reaches 45 ℃, the cooling requirement of the battery is preferentially met. In addition, when the temperature regulation required power P1 is greater than the temperature regulation actual power P2, if the battery temperature does not exceed 45 ℃, the cooling demand in the vehicle is still prioritized, and if the cooling power in the vehicle is already sufficient and reaches a balance, the opening degree of the battery cooling branch is increased to increase the cooling power of the battery. And if the temperature regulation required power P1 is less than or equal to the temperature regulation actual power P2, the requirement of cooling in the vehicle can be met preferentially.
According to an embodiment of the present invention, reducing the opening degree of the plurality of in-vehicle cooling branches specifically includes: temperature differences between the temperatures of the plurality of zones are obtained. And judging whether the temperature difference is larger than a fourth temperature threshold value. And if the temperature difference is greater than the fourth temperature threshold value, increasing the opening degree of the in-vehicle cooling branch corresponding to the refrigeration branch where the air outlet with the high temperature is located, and reducing the opening degree of the battery cooling branch corresponding to the refrigeration branch where the air outlet with the high temperature is located. The fourth temperature threshold may be preset according to actual conditions, and may be, for example, 3 ℃.
In an embodiment of the present invention, the plurality of refrigeration branches correspond to the plurality of air outlets, respectively, and the temperature of the plurality of zones is the temperature of the plurality of air outlets.
For example, as shown in fig. 21, 4 air outlets, air outlet 1-air outlet 4, may be disposed in the vehicle cabin. The corresponding zone temperature Tq is detected by detecting the tuyere temperature Tc. Suppose that the air outlet 1 and the air outlet 2 are provided with refrigeration power by the first refrigeration branch 11, and the air outlet 3 and the air outlet 4 are provided with refrigeration power by the second refrigeration branch 12.
Further, according to an embodiment of the present invention, the temperature adjustment method of the vehicle-mounted battery further includes: and the opening degree of the in-vehicle cooling branch corresponding to the refrigeration branch where the air outlet with the low temperature is located is reduced, and the opening degree of the battery cooling branch corresponding to the refrigeration branch where the air outlet with the low temperature is located is improved.
Specifically, in the battery cooling process, if the air conditioner needs to be started in the vehicle, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the vehicle is kept balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 21, when it is detected that the zone temperature Tq at the outlet port 1 and the outlet port 2 is higher than the zone temperature Tq in the vicinity of the outlet port 3 and the outlet port 4 by 3 ℃ or more, the opening degree in the first in-vehicle cooling branch passage is increased, and the opening degree in the first battery cooling branch passage is decreased, so that the cooling power in the first in-vehicle cooling branch passage is made larger. The cooling opening degree in the second in-vehicle cooling branch is also decreased, and the opening degree of the second battery cooling branch is increased, so that the cooling power in the second in-vehicle cooling branch is smaller. Therefore, the cooling power of the first battery cooling branch and the cooling power of the second battery cooling branch are not changed, and the air temperatures of areas near the air outlets in the vehicle are balanced. When the vehicle-mounted air conditioner detects that the difference between the air temperature Tq of the area near the air outlet 1 and the air outlet 2 and the air temperature Tq of the area near the air outlet 3 and the air outlet 4 is within 3 ℃, the opening degrees of the first expansion valves in the first vehicle internal cooling branch and the second vehicle internal cooling branch are controlled to be the same, so that the cooling powers of the first vehicle internal cooling branch and the second vehicle internal cooling branch are guaranteed to be the same.
According to an embodiment of the present invention, when the heating mode is selected, the method further includes: it is determined whether the temperature regulation required power P1 of the battery is greater than the temperature regulation actual power P2. If the temperature regulation required power P1 of the battery is greater than the temperature regulation actual power P2, a power difference between the temperature regulation required power P1 of the battery and the temperature regulation actual power P2 is acquired, and the power of a heater for cooling the battery is increased according to the power difference, or the flow rate of coolant of a circulation branch loop of the battery is adjusted to be increased to increase the heating power of the battery. If the temperature regulation required power P1 of the battery is less than or equal to the temperature regulation actual power P2, the power of the heater is reduced or kept unchanged, or the flow of the cooling liquid of the circulation branch loop of the battery is regulated to be reduced, so that the heating power of the battery is reduced.
Specifically, when in the heating mode, the P1 and P2 of the battery are acquired, respectively, and judged. If P1 is greater than P2, it means that if the temperature rise of the battery cannot be completed within the target time according to the current heating power or coolant flow, so the power difference between P1 and P2 of the battery is obtained, and the power of the heater for heating the battery is increased according to the power difference, or the coolant flow of the circulation branch loop of the battery is increased by adjusting the rotation speed of the corresponding pump, so that the battery can complete the temperature adjustment within the target time t. Wherein the larger the difference between P1 and P2, the more the power of the heater is increased. If the P1 of the battery is less than or equal to P2, the power of the heater can be reduced appropriately to save electric energy, or the flow of the cooling liquid of the circulation branch loop of the battery is reduced by adjusting the corresponding rotating speed of the pump to reduce the heating power, or the power of the heater is kept unchanged. When the temperature of the battery is higher than a preset temperature, for example, 10 ℃, the battery heating is completed, information for turning off the temperature adjusting function is transmitted to the vehicle-mounted air conditioner through the CAN communication, and the heater is controlled to be turned off. If the temperature of the battery is still below 10 c after the thermostat system enters the heating mode for a longer period of time, for example, 1 hour, then the heater power is increased appropriately to allow the battery to finish warming as soon as possible.
According to an embodiment of the present invention, the temperature adjustment method of the in-vehicle battery may further include: if the temperature regulation required power P1 of the battery is less than the temperature regulation actual power P2, reducing the rotation speed of the pump in the flow path of the battery; if the temperature regulation required power P1 of the battery is greater than the temperature regulation actual power P2, the rotation speed of the pump in the flow path of the battery is increased.
Specifically, when the temperature adjusting system enters the heating mode or the cooling mode, if the P1 of the battery is less than the P2, the rotation speed of the corresponding pump is controlled to be reduced to save electric power. And if the P1 of the battery is larger than the P2, the controller controls the power of the corresponding heater or compressor to be increased or the flow rate of the cooling liquid of the circulating branch loop of the battery to be increased, and controls the rotating speed of the pump to be increased, so that the mass of the cooling liquid flowing through the cross section of the cooling flow path in unit time can be increased, and the temperature of the battery is adjusted to be actually P2, so that the temperature adjustment can be realized within the target time t.
In summary, according to the temperature adjustment method for the vehicle-mounted battery in the embodiment of the invention, firstly, the required power for temperature adjustment and the actual power for temperature adjustment of the battery are respectively obtained, then, the zone temperatures and the set air-conditioning temperatures of the plurality of zones in the vehicle are respectively obtained, and then, the opening degrees of the plurality of in-vehicle cooling branches, the plurality of battery cooling branches and the plurality of refrigeration branches are adjusted according to the required power for temperature adjustment, the actual power for temperature adjustment, the plurality of zone temperatures and the set air-conditioning temperature. Therefore, the method distributes the refrigerating capacity of the battery and each area in the carriage according to the actual state of the battery, the temperatures of a plurality of areas in the carriage and the set temperature of the air conditioner, can adjust the temperature when the temperature of the battery is too high or too low, enables the temperature of the battery to be maintained in a preset range, and can balance the temperature of each area in the carriage.
When the battery supplies refrigerant to the plurality of compressors 1 and the compressors are independent of each other, the in-vehicle cooling branch 3 and the battery cooling return branch 4 may be 1.
For example, as shown in fig. 28, two compressors are taken as an example, and the two compressors include a first compressor 11 and a second compressor 12. The controller may control the number of starts of the compressor according to the temperature-regulation required power P1 and the temperature-regulation actual power P2.
Specifically, when the battery 6 is cooled, if P1 is greater than P2, one compressor is controlled to start, and if P1 is less than P2, both compressors are controlled to start.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (31)

1. A temperature adjustment method of an in-vehicle battery, characterized in that a temperature adjustment system of the in-vehicle battery includes a plurality of refrigeration circuits and a plurality of battery cooling circuits corresponding to the plurality of refrigeration circuits, a plurality of in-vehicle cooling circuits, a plurality of batteries, and a plurality of battery temperature adjustment modules connected between the plurality of batteries and the plurality of battery cooling circuits, the method comprising the steps of:
Detecting temperatures of the plurality of batteries;
entering a cooling mode when the temperature of any one of the plurality of batteries is greater than a first temperature threshold;
entering a heating mode when the temperature of any one of the plurality of batteries is less than a second temperature threshold;
respectively acquiring temperature regulation required power and temperature regulation actual power of the plurality of batteries, wherein the temperature regulation required power is the temperature regulation power required by the batteries when the temperature of the batteries is regulated to a target temperature; the temperature adjustment actual power is the temperature adjustment power actually obtained by the battery when the temperature of the battery is adjusted;
respectively acquiring the zone temperatures and the set air conditioner temperatures of a plurality of zones in the vehicle;
adjusting the opening degrees of the plurality of in-vehicle cooling circuits, the plurality of battery cooling circuits and the plurality of refrigeration circuits according to the required temperature adjustment power, the actual temperature adjustment power, the plurality of zone temperatures and the set temperature of the air conditioner, so that the battery reaches the target temperature within the target time, wherein the plurality of battery cooling circuits are communicated with one another, and the opening degrees of the refrigeration capacities provided by the plurality of compressors to the battery cooling circuits corresponding to the battery are adjusted according to the required temperature adjustment power and the actual temperature adjustment power of the battery;
The adjusting the opening degrees of the plurality of in-vehicle cooling circuits, the plurality of battery cooling circuits, and the plurality of refrigeration circuits according to the temperature adjustment required power, the temperature adjustment actual power, the plurality of zone temperatures, and the air conditioner set temperature specifically includes:
in a cooling mode, when the temperature regulation required power of the battery cooling circuit is larger than the temperature regulation actual power, judging whether the battery temperature is larger than a third temperature threshold value, wherein the third temperature threshold value is larger than the first temperature threshold value;
if the temperature of the battery is greater than the third temperature threshold, reducing the opening degree of the plurality of in-vehicle cooling loops and increasing the opening degree of the plurality of battery cooling loops, wherein each battery is controlled by a corresponding valve;
if the battery temperature is lower than the third temperature threshold value, further judging whether the temperature in the vehicle is higher than the set temperature of the air conditioner; and if the in-vehicle temperature is higher than the set temperature of the air conditioner, increasing the opening degree of the plurality of in-vehicle cooling circuits and reducing the opening degree of the plurality of battery cooling circuits.
2. The method for adjusting the temperature of the vehicle-mounted battery according to claim 1, characterized by further comprising:
Generating total temperature regulation required power according to the temperature regulation required power of each battery;
generating a total rated refrigerating power of the plurality of compressors according to the rated refrigerating powers of the plurality of compressors;
determining whether the total thermostat demand power is greater than a total custom cold power of the plurality of compressors;
if the total temperature regulation required power is larger than the total customized cooling power of the plurality of compressors, adjusting the opening degree of the plurality of compressors to the cooling capacity of the battery cooling loop corresponding to the battery to the maximum;
and if the total temperature regulation required power is less than or equal to the total rated refrigerating power of the plurality of compressors, adjusting the refrigerating capacity opening degree of a battery cooling loop corresponding to the battery according to the difference between the total temperature regulation required power and the total rated refrigerating power.
3. The method according to claim 1, wherein the obtaining of the power required for temperature adjustment of the plurality of batteries, respectively, specifically comprises:
respectively obtaining a first parameter when the starting temperature of each battery is adjusted, and generating a first temperature adjustment required power of each battery according to the first parameter, wherein the first parameter is an initial temperature and a target temperature when the starting temperature of each battery is adjusted, and a target time from the initial temperature to the target temperature;
Respectively obtaining a second parameter of each battery during temperature adjustment, and generating a second temperature adjustment required power of each battery according to the second parameter, wherein the second parameter is an average current of each battery within a preset time;
generating the temperature regulation required power of each battery according to the first temperature regulation required power and the second temperature regulation required power.
4. The method for adjusting the temperature of the in-vehicle battery according to claim 3, wherein the generating the first temperature-adjustment required power according to the first parameter specifically includes:
acquiring a first temperature difference between the initial temperature and the target temperature;
and generating first temperature regulation required power according to the first temperature difference and the target time.
5. The temperature adjustment method of the vehicle-mounted battery according to claim 3, characterized in that the first temperature adjustment required power is generated by the following formula:
ΔT1*C*M/t,
wherein, Delta T1Is a first temperature difference between the initial temperature and the target temperature, t is the target time, C is the specific heat capacity of the battery, and M is the mass of the battery.
6. The temperature adjustment method of the vehicle-mounted battery according to claim 3, characterized in that the second temperature adjustment required power is generated by the following formula:
I2*R,
Wherein I is the average current and R is the internal resistance of the battery.
7. The method for adjusting the temperature of the vehicle-mounted battery according to claim 1, characterized by further comprising:
judging whether the temperature regulation required power of each battery is larger than the temperature regulation actual power corresponding to each battery;
if the temperature regulation required power of a certain battery is larger than the temperature regulation actual power corresponding to the battery, acquiring the power difference between the temperature regulation required power and the temperature regulation actual power of the battery, and increasing the power of a compressor for cooling the battery according to the power difference, or regulating and increasing the flow of cooling liquid of a battery cooling loop corresponding to the battery to increase the cooling power of the battery;
and if the temperature regulation required power of a certain battery is less than or equal to the temperature regulation actual power corresponding to the battery, reducing the power of the compressor or keeping the power of the compressor unchanged, or regulating and reducing the flow of the cooling liquid of the battery cooling loop corresponding to the battery so as to reduce the cooling power of the battery.
8. The method according to claim 7, wherein the reducing the degree of opening of the plurality of in-vehicle cooling circuits specifically includes:
Acquiring temperature differences among the temperatures of the plurality of areas;
judging whether the temperature difference is greater than a fourth temperature threshold value; and if the opening degree of the in-vehicle cooling circuit corresponding to the refrigerating circuit where the air outlet with the high temperature is located is larger than the fourth temperature threshold, the opening degree of the in-vehicle cooling circuit corresponding to the refrigerating circuit where the air outlet with the high temperature is located is increased, and the opening degree of the battery cooling circuit corresponding to the refrigerating circuit where the air outlet with the high temperature is located is reduced.
9. The method for adjusting the temperature of the vehicle-mounted battery according to claim 8, characterized by further comprising:
and reducing the opening degree of the in-vehicle cooling loop corresponding to the refrigeration loop where the air outlet with low temperature is located, and improving the opening degree of the battery cooling loop corresponding to the refrigeration loop where the air outlet with low temperature is located.
10. The method for adjusting the temperature of a vehicle-mounted battery according to claim 1, when in a heating mode, further comprising:
judging whether the temperature regulation required power of each battery is larger than the temperature regulation actual power corresponding to each battery;
if the temperature regulation required power of a certain battery is larger than the temperature regulation actual power corresponding to the battery, acquiring the power difference between the temperature regulation required power and the temperature regulation actual power of the battery, and increasing the power of a heater for heating the battery according to the power difference;
And if the temperature regulation required power of the certain battery is less than or equal to the temperature regulation actual power corresponding to the battery, reducing the power of the heater or keeping the power of the heater unchanged.
11. The method for adjusting the temperature of the vehicle-mounted battery according to claim 1, characterized by further comprising:
if the temperature regulation required power of a certain battery is smaller than the temperature regulation actual power, reducing the rotating speed of a water pump in a flow path of the battery;
and if the temperature regulation required power of a certain battery is greater than the temperature regulation actual power, increasing the rotating speed of the water pump in the flow path of the battery.
12. The method according to claim 1, wherein the obtaining the temperature-regulated actual powers of the plurality of batteries, respectively, specifically comprises:
acquiring an inlet temperature and an outlet temperature of a flow path for adjusting the temperature of each cell, and acquiring a flow rate of a coolant flowing into the flow path;
generating a second temperature difference for each cell based on the flow path inlet temperature and outlet temperature for each cell;
and generating the temperature regulation actual power of each battery according to the second temperature difference of each battery and the flow rate.
13. The temperature adjustment method of the vehicle-mounted battery according to claim 12, characterized in that the temperature-adjusted actual power is generated by the following formula:
ΔT2*c*m,
wherein, the Δ T2And c is the specific heat capacity of the cooling liquid in the flow path, m is the mass of the cooling liquid flowing through the cross-sectional area of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross-sectional area of the flow path.
14. The method for adjusting the temperature of a vehicle-mounted battery according to claim 1, wherein the battery is a battery pack or a battery module.
15. A temperature adjustment system of a vehicle-mounted battery, characterized by comprising:
a plurality of refrigeration circuits, wherein each refrigeration circuit comprises a compressor, a condenser connected to the compressor;
a plurality of in-vehicle cooling circuits connected to the plurality of refrigeration circuits;
a plurality of battery cooling circuits connected to the plurality of refrigeration circuits, wherein the plurality of battery cooling circuits are in communication with each other;
a controller for detecting temperatures of a plurality of batteries and controlling the temperature regulating system to enter a cooling mode when the temperature of any one of the plurality of batteries is greater than a first temperature threshold and controlling the temperature regulating system to enter a heating mode when the temperature of any one of the plurality of batteries is less than a second temperature threshold;
The battery temperature adjusting modules are respectively connected with the batteries and the battery cooling loops and used for acquiring required temperature adjusting power and actual temperature adjusting power, acquiring zone temperatures and set air conditioner temperatures of a plurality of zones in a vehicle, adjusting the opening degrees of the in-vehicle cooling loops, the battery cooling loops and the refrigeration loops according to the required temperature adjusting power, the actual temperature adjusting power, the zone temperatures and the set air conditioner temperatures so that the batteries reach target temperatures within target time, and adjusting the opening degrees of refrigerating capacity provided by the compressors to the battery cooling loops corresponding to the batteries according to the required temperature adjusting power and the actual temperature adjusting power of the batteries;
the required temperature regulation power is the required temperature regulation power of the battery when the temperature of the battery is regulated to a target temperature; the temperature adjustment actual power is the temperature adjustment power actually obtained by the battery when the temperature of the battery is adjusted;
the adjusting the opening degrees of the plurality of in-vehicle cooling circuits, the plurality of battery cooling circuits, and the plurality of refrigeration circuits according to the temperature adjustment required power, the temperature adjustment actual power, the plurality of zone temperatures, and the air conditioner set temperature specifically includes:
In a cooling mode, when the temperature regulation required power of the battery cooling circuit is larger than the temperature regulation actual power, judging whether the battery temperature is larger than a third temperature threshold value, wherein the third temperature threshold value is larger than the first temperature threshold value;
if the temperature of the battery is greater than the third temperature threshold, reducing the opening degree of the plurality of in-vehicle cooling loops and increasing the opening degree of the plurality of battery cooling loops, wherein each battery is controlled by a corresponding valve;
if the battery temperature is lower than the third temperature threshold value, further judging whether the temperature in the vehicle is higher than the set temperature of the air conditioner; and if the in-vehicle temperature is higher than the set temperature of the air conditioner, increasing the opening degree of the plurality of in-vehicle cooling circuits and reducing the opening degree of the plurality of battery cooling circuits.
16. The system of claim 15, wherein the battery cooling circuit includes a heat exchanger coupled to the battery temperature conditioning module.
17. The temperature adjustment system of the vehicle-mounted battery according to claim 16, wherein the battery temperature adjustment module includes: a flow path that adjusts the temperature of the battery, the flow path being provided in the battery; the controller acquires temperature regulation required power and temperature regulation actual power of the plurality of batteries, and regulates the temperature of the batteries according to the temperature regulation required power and the temperature regulation actual power.
18. The temperature adjustment system of the vehicle-mounted battery according to claim 17, wherein the battery temperature adjustment module further includes: first temperature sensors respectively provided at inlets of the flow paths, second temperature sensors respectively provided at outlets of the flow paths, and flow velocity sensors.
19. The vehicle-mounted battery thermostat system according to claim 18, wherein said controller is further configured to generate a total thermostat demand power based on the thermostat demand power of each of said batteries, determine whether the total thermostat demand power is greater than a total custom cooling power of said plurality of compressors,
when the total temperature regulation required power is larger than the total customized cooling power of the plurality of compressors, the controller adjusts the opening degree of the refrigerating capacity of the battery cooling loop corresponding to the battery from the plurality of compressors to the maximum;
and when the total temperature regulation required power is less than or equal to the total rated refrigerating power of the plurality of compressors, the controller adjusts the refrigerating capacity opening degree of the battery cooling loop corresponding to the battery according to the difference between the total temperature regulation required power and the total rated refrigerating power.
20. The temperature adjustment system of the vehicle-mounted battery according to claim 19, the controller is used for respectively obtaining a first parameter when the starting temperature of each battery is adjusted, generating a first temperature adjustment required power of each battery according to the first parameter, respectively acquiring second parameters of each battery during temperature adjustment, generating second temperature adjustment required power of each battery according to the second parameters, and generates the temperature regulation required power of each battery based on the first temperature regulation required power and the second temperature regulation required power, the first parameter is an initial temperature and a target temperature when the opening temperature of the battery is adjusted and a target time from the initial temperature to the target temperature, and the second parameter is an average current of the battery in a preset time.
21. The temperature adjustment system of the vehicle-mounted battery according to claim 20, wherein the controller acquires a first temperature difference between the initial temperature and the target temperature, and generates a first temperature adjustment required power according to the first temperature difference and the target time.
22. The temperature adjustment system of the vehicle-mounted battery according to claim 21, wherein the controller generates the first temperature adjustment required power by the following formula:
ΔT1*C*M/t,
wherein, Delta T1And a first temperature difference between the initial temperature and the target temperature of each battery, t is the target time, C is the specific heat capacity of the battery, and M is the mass of the battery.
23. The temperature adjustment system of the vehicle-mounted battery according to claim 21, wherein the controller generates the second temperature adjustment required power for each battery by the following formula:
I2*R,
wherein I is the average current and R is the internal resistance of the battery.
24. The temperature adjustment system for the vehicle-mounted battery according to claim 17, wherein when in the cooling mode, the controller obtains a power difference between a temperature adjustment required power for a certain battery and a temperature adjustment actual power for the battery when the temperature adjustment required power for the certain battery is larger than the temperature adjustment actual power for the battery, and increases a power of a compressor for cooling the battery according to the power difference, or adjusts a flow rate of a coolant for increasing a battery cooling circuit for the battery to increase the cooling power for the battery, and decreases the power of the compressor or keeps the power of the compressor constant, or adjusts and decreases the flow rate of the coolant for the battery cooling circuit for the battery when the temperature adjustment required power for the certain battery is smaller than or equal to the temperature adjustment actual power for the battery, to reduce the cooling power of the battery.
25. The system of claim 24, wherein the controller is further configured to obtain a temperature difference between the temperatures of the plurality of zones, and when the temperature difference is greater than a fourth temperature threshold, increase an opening degree of an in-vehicle cooling circuit corresponding to the refrigeration circuit in which the outlet with the higher temperature is located, and decrease an opening degree of a battery cooling circuit corresponding to the refrigeration circuit in which the outlet with the higher temperature is located.
26. The system of claim 25, wherein the controller is further configured to decrease an opening degree of an in-vehicle cooling circuit corresponding to the refrigeration circuit in which the air outlet with a low temperature is located, and increase an opening degree of a battery cooling circuit corresponding to the refrigeration circuit in which the air outlet with a low temperature is located.
27. The temperature adjustment system of the vehicle-mounted battery according to claim 17, wherein when in the heating mode, the controller obtains a power difference between a temperature adjustment required power of a certain battery and a temperature adjustment actual power corresponding to the battery, and increases a power of a heater for heating the battery according to the power difference, or adjusts a flow rate of a coolant that increases a circulation branch circuit of the battery to increase the heating power of the battery, and decreases the power of the heater, or keeps the power of the heater constant, or adjusts a flow rate of a coolant that decreases the circulation branch circuit of the battery when the temperature adjustment required power of the certain battery is less than or equal to the temperature adjustment actual power corresponding to the battery, to reduce the heating power of the battery.
28. The system of claim 17, wherein the controller is further configured to decrease a rotation speed of a water pump in a flow path of the battery when a temperature regulation required power of the certain battery is smaller than the temperature regulation actual power, and increase the rotation speed of the water pump in the flow path of the battery when the temperature regulation required power of the certain battery is larger than the temperature regulation actual power.
29. The temperature adjustment system of the vehicle-mounted battery according to claim 18, wherein the controller generates a second temperature difference of each battery based on an inlet temperature detected by the first temperature sensor and an outlet temperature detected by a second temperature sensor, respectively, and generates the temperature-adjusted actual power of each battery based on the second temperature difference of each battery and a flow rate detected by the flow rate sensor.
30. The temperature adjustment system of the vehicle-mounted battery according to claim 29, wherein the temperature-adjusted actual power is generated by the following formula:
ΔT2*c*m,
wherein, the Δ T2And c is the specific heat capacity of the cooling liquid in the flow path, and m is the mass of the cooling liquid flowing through the cross-sectional area of the flow path in unit time, wherein m is v ρ s, v is the flow velocity of the cooling liquid, ρ is the density of the cooling liquid, and s is the cross-sectional area of the flow path.
31. The system for regulating temperature of a vehicle-mounted battery according to any one of claims 24 to 30, wherein the battery is a battery pack or a battery module.
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