CN112909383A - Thermal management control method and system for cooling power battery - Google Patents
Thermal management control method and system for cooling power battery Download PDFInfo
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- CN112909383A CN112909383A CN202110056231.4A CN202110056231A CN112909383A CN 112909383 A CN112909383 A CN 112909383A CN 202110056231 A CN202110056231 A CN 202110056231A CN 112909383 A CN112909383 A CN 112909383A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
- H01M10/663—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Automation & Control Theory (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a thermal management control method and system for cooling a power battery, and relates to the field of new energy of vehicles. The method comprises the steps of firstly obtaining the cell temperature of the power battery of the vehicle and the environment temperature of the environment where the power battery is located, and then selectively controlling and conducting a first loop or a second loop according to the cell temperature of the power battery and the environment temperature of the environment where the power battery is located when the cell temperature reaches a first preset temperature, wherein the first loop is used for cooling the cooling liquid of the power battery by using a compressor and a heat exchanger of the vehicle, the second loop is used for cooling the cooling liquid of the power battery by using a battery radiator, and the first loop and the second loop are independent from a driving system of the vehicle. According to the invention, the compressor of the vehicle is used for radiating the power battery when the temperature of the power battery is higher, and the battery radiator is used for radiating the power battery when the temperature of the power battery is not too high but cooling requirements exist, so that the start and stop of the compressor can be reduced, and the compressor is prevented from being damaged.
Description
Technical Field
The invention relates to the field of new energy of vehicles, in particular to a thermal management control method and system for cooling a power battery.
Background
With the strict environmental requirements and the upgrading of emission regulations, the new energy vehicle type adopting the power battery has become a development trend. At present, the power battery is mainly divided into two schemes of air cooling and liquid cooling. The air-cooled battery mostly adopts a natural cooling mode, so that the problems of battery over-temperature in the summer quick charging condition, power limitation caused by battery over-temperature in the high-temperature limit driving working condition and the like exist, and the service life of the battery is influenced. In order to avoid the above problems, liquid-cooled batteries are often used.
To the liquid cooling battery, in order to guarantee the normal operating temperature of battery, generally adopt the mode that air conditioner refrigerant and coolant carry out the heat transfer, this mode has following several problems:
1. the cooling of the air conditioner refrigerant inevitably requires the starting of an air conditioner compressor, and the corresponding fan is started when the compressor works, so that the energy consumption is increased, and simultaneously the NVH (Noise, Vibration and Harshness) is influenced.
2. When the battery has a cooling demand in spring and autumn, after the compressor works and the cooler refrigerant exchanges heat with the cooling liquid, the temperature of the battery is reduced, and after a period of time, the battery quits the cooling request. After the temperature of the battery rises, the cooling request is continuously sent, and the compressor is easily damaged due to the fact that the compressor is started and stopped for many times.
3. The compressor does not work under zero degrees centigrade generally, and if working conditions of quick charge, continuous discharge, quick charge, continuous discharge and the like exist at the moment, the battery finally has a cooling demand; but at this time the compressor cannot be started due to low temperature protection, thereby affecting battery cooling.
4. If the water of the battery circuit is connected in series to the electric drive system in the event of non-operation of the low-temperature compressor, there is a risk that the high-temperature water of the electric drive circuit flows in series to the battery circuit.
Disclosure of Invention
The invention aims to provide a thermal management control method for cooling a power battery, which solves the technical problem that a compressor is damaged when the compressor is started for multiple times to cool the power battery in the prior art.
It is a further object of the first aspect of the invention to reduce energy consumption and noise of the vehicle.
It is an object of a second aspect of the invention to provide a thermal management control system for cooling a power cell.
According to an object of a first aspect of the present invention, there is provided a thermal management control method for cooling a power cell, comprising:
acquiring the cell temperature of a power battery of a vehicle and the environmental temperature of the environment where the power battery is located;
selectively controlling and conducting a first loop or a second loop according to the battery core temperature of the power battery and the environment temperature of the environment where the power battery is located when the battery core temperature reaches a first preset temperature, wherein the first loop is used for cooling the cooling liquid of the power battery by using a compressor and a heat exchanger of a vehicle, the second loop is used for cooling the cooling liquid of the power battery by using a battery radiator, and the first loop and the second loop are independent of a driving system of the vehicle.
Optionally, the step of selectively controlling and conducting the first loop or the second loop according to the cell temperature of the power battery and the ambient temperature of the environment where the power battery is located when the cell temperature reaches the first preset temperature specifically includes:
controlling to conduct the first loop when any one of the following conditions is met:
one condition is that the ambient temperature reaches a second preset temperature;
the other condition is that the environment temperature is greater than a third preset temperature and less than the second preset temperature and the cell temperature reaches a fourth preset temperature, wherein the second preset temperature is less than the first preset temperature, and the fourth preset temperature is greater than the first preset temperature.
Optionally, the step of selectively controlling to turn on the second loop or the second loop according to the cell temperature of the power battery and the ambient temperature of the environment where the power battery is located when the cell temperature reaches the first preset temperature specifically includes:
controlling to conduct the second loop when any one of the following conditions is met:
a condition is that the ambient temperature is less than or equal to the third predetermined temperature;
the other condition is that the environment temperature is greater than the third preset temperature and less than the second preset temperature and the cell temperature is less than the fourth preset temperature.
Optionally, when the ambient temperature of the power battery is lower than the first preset temperature, determining whether the power battery needs to be heated;
and if so, controlling to conduct the first loop to prevent the heated cooling liquid from being cooled by the battery radiator, and at the moment, enabling the compressor and the heat exchanger to not work.
Optionally, before the step of selectively controlling to conduct the first loop or the second loop, the method further includes:
acquiring running parameter information of a vehicle when a driving system of the vehicle is started;
searching a first duty ratio of a fan in the driving system corresponding to the operation parameter information from a preset storage module according to the operation parameter information, wherein the preset storage module stores the corresponding relation between the operation parameter information and the first duty ratio in advance;
and when the cell temperature is lower than the first preset temperature, controlling the fan to operate according to the first duty ratio.
Optionally, after the step of searching for the first duty ratio of the fan in the driving system corresponding to the operating parameter information from a preset storage module according to the operating parameter information, the method further includes:
when the battery core temperature reaches the first preset temperature and the second loop is conducted, acquiring the temperature of cooling liquid for cooling the power battery;
searching a second duty ratio of the fan corresponding to the temperature of the cooling liquid from the preset storage module according to the temperature of the cooling liquid, wherein the preset storage module stores a corresponding relation between the temperature of the cooling liquid and the second duty ratio in advance;
and when the second duty ratio is larger than or equal to the first duty ratio, controlling the fan to operate according to the second duty ratio.
Optionally, the first preset temperature is any value in the range of 30-34 ℃;
the second preset temperature is any value within the range of 10-15 ℃;
the third preset temperature is any value within the range of minus 3 ℃ to minus 5 ℃;
the fourth preset temperature is any value within the range of 35-38 ℃.
Optionally, the operation parameter information includes vehicle speed, air conditioner pressure, and temperature of cooling liquid in the driving system.
According to an object of a second aspect of the present invention, there is also provided a thermal management control system for cooling a power cell, comprising:
the acquisition module is used for acquiring the cell temperature of a power battery of a vehicle and the environmental temperature of the environment where the power battery is located; and
the control module comprises a memory and a processor, wherein the memory stores a computing program, and the computing program is used for realizing the thermal management control method when being executed by the processor.
Optionally, the method further comprises:
the battery cooling valve is provided with an inlet, a first outlet and a second outlet, wherein the first outlet is communicated with or disconnected from the inlet, the first loop is conducted when the inlet is communicated with the first outlet and disconnected from the second outlet, the second loop is conducted when the inlet is communicated with the second outlet and disconnected from the first outlet, a battery radiator is arranged in the second loop, and the battery radiator and a fan in the driving system are arranged in parallel.
The method comprises the steps of firstly obtaining the cell temperature of the power battery of the vehicle and the environment temperature of the environment where the power battery is located, and then selectively controlling and conducting a first loop or a second loop according to the cell temperature of the power battery and the environment temperature of the environment where the power battery is located when the cell temperature reaches a first preset temperature, wherein the first loop is used for cooling the cooling liquid of the power battery by using a compressor and a heat exchanger of the vehicle, the second loop is used for cooling the cooling liquid of the power battery by using a battery radiator, and the first loop and the second loop are independent from a driving system of the vehicle. The invention comprehensively considers the environment temperature of the environment where the power battery is located and the temperature of the battery core, can accurately select the cooling loop of the power battery, uses the air-conditioning compressor to radiate the power battery when the temperature of the power battery is higher, uses the battery radiator to radiate the power battery when the temperature of the power battery is not too high but has cooling requirements, can reduce the starting and stopping of the compressor and avoid the damage of the compressor, and the two loops are independently designed with the driving system, so that the risk of series flow of a water path does not exist, and the driving system cannot be damaged.
Further, the method comprises the steps of acquiring running parameter information of the vehicle when a driving system of the vehicle is started; then searching a first duty ratio of a fan in a driving system corresponding to the operation parameter information from a preset storage module according to the operation parameter information, wherein the preset storage module stores the corresponding relation between the operation parameter information and the first duty ratio in advance; and then controlling the fan to operate according to a first duty ratio when the temperature of the battery core does not reach a first preset temperature, wherein the operation parameter information comprises the speed of the vehicle, the pressure of the air conditioner and the temperature of cooling liquid in a driving system. The invention considers various variables to select the duty ratio of the fan, can avoid energy consumption caused by two-gear high-low speed control, and can meet the NVH requirement of the fan by selecting the proper duty ratio.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic flow diagram of a thermal management control method for cooling a power cell according to one embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram of a thermal management control method for cooling a power cell according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart diagram of a thermal management control method for cooling a power cell according to yet another embodiment of the present invention;
fig. 4 is a schematic block diagram of a thermal management control system for cooling a power cell according to one embodiment of the present 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.
Fig. 1 is a schematic flow diagram of a thermal management control method for cooling a power cell according to one embodiment of the invention. As shown in fig. 1, in a specific embodiment, a thermal management control method for cooling a power battery includes the steps of:
s100, acquiring the cell temperature of a power battery of a vehicle and the environmental temperature of the environment where the power battery is located;
s200, judging whether the battery cell temperature reaches a first preset temperature T1, if so, executing S300;
and S300, selectively controlling and conducting a first loop or a second loop according to the battery core temperature of the power battery and the environment temperature of the environment where the power battery is located when the battery core temperature reaches a first preset temperature T1, wherein the first loop is used for cooling the cooling liquid of the power battery by using a compressor and a heat exchanger of the vehicle, the second loop is used for cooling the cooling liquid of the power battery by using a battery radiator, and the first loop and the second loop are independent of a driving system of the vehicle.
The invention comprehensively considers the environment temperature of the environment where the power battery is located and the temperature of the battery core, can accurately select the cooling loop of the power battery, uses the air-conditioning compressor to radiate the power battery when the temperature of the power battery is higher, and uses the battery radiator to radiate the power battery when the temperature of the power battery is not too high but has cooling requirements, thereby reducing the start and stop of the compressor and avoiding the damage of the compressor.
Fig. 2 is a schematic flow diagram of a thermal management control method for cooling a power cell according to another embodiment of the invention. As shown in fig. 2, in another embodiment, the step of selectively controlling and conducting the first loop according to the ambient temperature and the cell temperature of the power battery and selectively controlling and conducting the second loop according to the ambient temperature and the cell temperature of the power battery specifically includes the following steps:
s310, judging whether the environment temperature reaches a second preset temperature T2, if so, executing S330; if not, executing S320;
s320, determining whether the ambient temperature is greater than a third preset temperature T3 and less than a second preset temperature T2, and the cell temperature reaches a fourth preset temperature T4, where the second preset temperature T2 is less than the first preset temperature T1, the fourth preset temperature T4 is greater than the first preset temperature T1, if yes, performing S330; if not, executing S340;
and S330, controlling to conduct the first loop so as to cool the cooling liquid of the power battery by using a compressor and a heat exchanger of the vehicle.
S340, judging whether the ambient temperature is less than or equal to a third preset temperature T3, if so, executing S360; if not, executing S350;
s350, judging whether the environment temperature is greater than a third preset temperature T3 and less than a second preset temperature T2 or not, and the battery cell temperature is less than a fourth preset temperature T4; if yes, executing S360;
and S360, controlling to conduct the second loop so as to cool the cooling liquid of the power battery by using the battery radiator.
Further, after the step of step S200, the following steps are also included:
s400, judging whether the power battery needs to be heated or not when the ambient temperature of the power battery is lower than a first preset temperature T1; if yes, S330 is executed to avoid the heated cooling liquid being cooled by the battery radiator, at this time, the compressor and the heat exchanger do not work, and the power battery is in a self-heating state. That is to say, the first loop is conducted to avoid conducting the second loop when the power battery needs to be heated, so as to avoid the problems that the energy consumption is higher and the heating rate of the power battery is prolonged due to the fact that the heated cooling liquid is naturally cooled or forcibly cooled by the battery radiator.
The invention comprehensively considers the environment temperature and the electric core temperature of the environment where the power battery is located, and selects one of the two cooling loops to cool the power battery according to the temperature information of the environment temperature and the electric core temperature, thereby reducing the starting and stopping times of the compressor and prolonging the service life of the compressor.
Fig. 3 is a schematic flow chart of a thermal management control method for cooling a power cell according to yet another embodiment of the present invention. In yet another embodiment, as shown in fig. 3, before the step of selectively controlling to conduct the first loop or the second loop, the method further comprises the following steps:
s110, acquiring running parameter information of the vehicle when a driving system of the vehicle is started, wherein the running parameter information comprises the vehicle speed, the air conditioner pressure and the temperature of cooling liquid in the driving system;
s120, searching a first duty ratio a1 of the fan in the driving system corresponding to the operation parameter information from a preset storage module according to the operation parameter information, wherein the preset storage module stores the corresponding relation between the operation parameter information and the first duty ratio a1 in advance;
and then judging the cell temperature. Here, it should be noted that there is no precedence relationship among steps S110, S120, and S100.
Further, when the cell temperature is less than the first preset temperature T1, the following steps are performed:
and S510, controlling the fan to operate according to the first duty ratio a 1.
Further, when the cell temperature reaches the first preset temperature T1, the following steps are performed:
s520, judging whether the second loop is conducted or not, if so, executing S530; if not, executing S510;
s530, acquiring the temperature of cooling liquid for cooling the power battery;
s540, searching a second duty ratio of the fan corresponding to the temperature of the cooling liquid from a preset storage module according to the temperature of the cooling liquid, wherein the preset storage module stores the corresponding relation between the temperature of the cooling liquid and the second duty ratio in advance;
s550, judging whether the second duty ratio a2 is larger than or equal to the first duty ratio a1, if so, executing S560;
and S560, controlling the fan to operate according to the second duty ratio a 2. Here, the fan is PWM controlled.
The invention considers various variables to select the duty ratio of the fan, can avoid energy consumption caused by two-gear high-low speed control, and can meet the NVH requirement of the fan by selecting the proper duty ratio. The invention can reduce energy consumption and noise by reducing the high-power operation interval of the fan.
In one embodiment, the first predetermined temperature T1 is any value in the range of 30 ℃ to 34 ℃; the first preset temperature T1 may be understood as the temperature at which the power battery has a cooling demand.
The second preset temperature T2 is any value within the range of 10-15 ℃; the second preset temperature T2 is a normal temperature in spring and autumn.
The third preset temperature T3 is any value within the range of minus 3 ℃ to minus 5 ℃; the third preset temperature T3 may also be selected to be other values below zero degrees celsius.
The fourth preset temperature T4 is any value ranging from 35 ℃ to 38 ℃.
Under the condition that the compressor does not work in winter, when the power battery has a cooling requirement, the battery cooling valve is combined with the setting of the control strategy of the fan, the waterway flow is adjusted to flow to the battery radiator for heat dissipation, and the cooling requirement of the power battery is ensured; in spring and autumn, when the power battery has cooling requirements but the temperature is not high, the battery cooling valve is combined with the control strategy of the fan, and the battery radiator is used for radiating heat to reduce the starting time and the starting times of the compressor.
Fig. 4 is a schematic block diagram of a thermal management control system for cooling a power cell according to one embodiment of the present invention. In a specific embodiment, the thermal management control system 100 for cooling a power battery includes a collection module (not shown in the figure) for collecting the cell temperature of the power battery of a vehicle and the ambient temperature of the environment in which the power battery is located, and a control module 40. The control module 40 includes a memory and a processor, the memory stores a computing program, and the computing program is used for implementing the thermal management control method according to any one of the above embodiments when executed by the processor. The processor may be a Central Processing Unit (CPU), a digital processing unit, or the like. The processor receives and transmits data through the communication interface. The memory is used for storing programs executed by the processor. The memory is any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by the computer, or a combination of memories. The above-described computing program may be downloaded from a computer-readable storage medium to a corresponding computing/processing device or to a computer or external storage device via a network (e.g., the internet, a local area network, a wide area network, and/or a wireless network).
Further, as shown in fig. 4, the thermal management control system 100 for cooling the power battery further includes a battery cooling valve 23 having an inlet a, a first outlet c and a second outlet b, wherein the first circuit is conducted when the inlet a is communicated with the first outlet c and disconnected from the second outlet b, and the second circuit is conducted when the inlet a is communicated with the second outlet b and disconnected from the first outlet c, and a battery radiator 24 is disposed in the second circuit, and the battery radiator 24 is disposed in parallel with the fan 31 in the driving system 30. Specifically, when the battery cooling valve 23 is powered on, the inlet a and the second outlet b are default to be communicated, and the inlet a and the first outlet c are not communicated.
Further, the air conditioning system 10 of the vehicle includes a compressor 11, an evaporator 12 and a condenser 14 connected to each other, and a PCT heater 13 is provided beside the evaporator 12, where the cabin heating is heated by the PCT heater 13, wherein a refrigerant circuit required for cooling the passenger compartment and a refrigerant circuit required for cooling the battery are controlled by a three-way 16 having one end connected to a stop valve 17 and an expansion valve 18 for controlling the refrigerant on the cabin side and the other end connected to an electronic expansion valve 19 for controlling the flow rate of the refrigerant required for cooling the battery circuit. Wherein, still be equipped with pressure sensor and filling valve in the refrigerator agent return circuit. A low-temperature radiator 32 and a fan 31 are provided in a drive system 30 of the vehicle. The battery system 20 of the vehicle comprises a power battery 21, a battery radiator 24 and a temperature sensor 22 for detecting the temperature of cooling liquid in a cooling circuit of the power battery, wherein the refrigerant in the air conditioning system 10 and the cooling liquid circuit of the battery system 20 both pass through the heat exchanger 15 to exchange heat with the refrigerant in the air conditioning system 10 to the cooling liquid in the battery system 20, and the power battery 21 has a heating film inside, and can be heated by the heating film, i.e. in a self-heating state. When the heating state of the heating film of the battery is not available, the battery cooling valve 23 keeps the default state, and when the heating state of the heating film of the battery is available, the inlet a of the battery cooling valve 23 is controlled to be communicated with the first outlet c, and the inlet a is controlled not to be communicated with the second outlet b. Specifically, the battery radiator 24, the condenser 14, the low-temperature radiator 32, and the fan 31 are arranged in parallel, wherein the condenser 14 and the low-temperature radiator 32 are disposed between the battery radiator 24 and the fan 31. If not limited by space, the low temperature radiator 32 may also be disposed above and below the battery radiator 24 with the condenser 14 disposed at the foremost end.
The opening and setting of the battery cooling valve 23 synchronously considers the waterway flow direction of the power battery 21 in a heating request state, and avoids energy waste caused by heat exchange of heated hot water by the externally connected low-temperature radiator 32.
Specifically, when the first loop is conducted, that is, the inlet a and the first outlet c of the three-way battery valve 23 are conducted, the heat exchanger 15 is arranged in parallel with the battery radiator 24, and at this time, the coolant of the power battery 21 does not pass through the battery radiator 24, and the power battery 21 performs heat exchange with the air conditioning system 10 by using the heat exchanger 15, so as to achieve the purpose of reducing the temperature of the power battery 21. When the second loop is conducted, that is, the inlet a and the second outlet b of the three-way battery valve 23 are conducted, the heat exchanger 15 and the battery radiator 24 are arranged in series, but at this time, the compressor 11 in the air conditioning system 10 is not turned on, no refrigerant flows into the heat exchanger 15, and the cooling liquid of the power battery 21 is cooled by the battery radiator 24, so that the purpose of reducing the temperature of the power battery 21 is achieved.
That is, in the present invention, when the compressor 11 of the air conditioning system 10 satisfies the operating condition, the compressor 11 is operated, the electronic expansion valve 19 is opened, the refrigerant passes through one side of the heat exchanger 15 to exchange heat with the coolant passing through the other side of the heat exchanger 15 for cooling, and the inlet a of the battery cooling valve 23 is communicated with the first outlet c and directly returns to the front of the water pump 25 of the power battery cooling circuit through the ac port. When the working condition of the compressor 11 is not satisfied, the electronic expansion valve 19 is closed, no refrigerant passes through the heat exchanger 15, the inlet a and the second outlet b of the battery cooling valve 23 are communicated, and the cooling liquid of the power battery 21 flows through the battery radiator 24, is forcibly cooled by the fan 31 and then returns to the front of the water pump 25 of the power battery cooling loop.
The thermal management control system designed by the invention controls the battery cooling valve 23, so that the flow direction of the cooling liquid of the power battery 21 is controlled, the cooling requirement of the power battery 21 in a low-temperature environment in winter can be met, the damage risk of starting and stopping the compressor 11 for multiple times in spring and autumn is reduced, and the over-temperature risk of water channeling between a cooling water channel of the power battery 21 and a driving system can be avoided.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A thermal management control method for cooling a power cell, comprising:
acquiring the cell temperature of a power battery of a vehicle and the environmental temperature of the environment where the power battery is located;
selectively controlling and conducting a first loop or a second loop according to the battery core temperature of the power battery and the environment temperature of the environment where the power battery is located when the battery core temperature reaches a first preset temperature, wherein the first loop is used for cooling the cooling liquid of the power battery by using a compressor and a heat exchanger of a vehicle, the second loop is used for cooling the cooling liquid of the power battery by using a battery radiator, and the first loop and the second loop are independent of a driving system of the vehicle.
2. The thermal management control method according to claim 1, wherein the step of selectively controlling to conduct the first loop or the second loop according to the cell temperature of the power battery and an ambient temperature of an environment where the power battery is located when the cell temperature reaches a first preset temperature specifically includes:
controlling to conduct the first loop when any one of the following conditions is met:
one condition is that the ambient temperature reaches a second preset temperature;
the other condition is that the environment temperature is greater than a third preset temperature and less than the second preset temperature and the cell temperature reaches a fourth preset temperature, wherein the second preset temperature is less than the first preset temperature, and the fourth preset temperature is greater than the first preset temperature.
3. The thermal management control method according to claim 2, wherein the step of selectively controlling to conduct the second loop or the second loop according to the cell temperature of the power battery and the ambient temperature of the environment where the power battery is located when the cell temperature reaches the first preset temperature specifically includes:
controlling to conduct the second loop when any one of the following conditions is met:
a condition is that the ambient temperature is less than or equal to the third predetermined temperature;
the other condition is that the environment temperature is greater than the third preset temperature and less than the second preset temperature and the cell temperature is less than the fourth preset temperature.
4. The thermal management control method according to claim 1,
judging whether the power battery needs to be heated or not when the ambient temperature of the power battery is lower than the first preset temperature;
and if so, controlling to conduct the first loop to prevent the heated cooling liquid from being cooled by the battery radiator, and at the moment, enabling the compressor and the heat exchanger to not work.
5. The thermal management control method of claim 1, further comprising, prior to the step of selectively controlling the conduction of the first loop or the second loop:
acquiring running parameter information of a vehicle when a driving system of the vehicle is started;
searching a first duty ratio of a fan in the driving system corresponding to the operation parameter information from a preset storage module according to the operation parameter information, wherein the preset storage module stores the corresponding relation between the operation parameter information and the first duty ratio in advance;
and when the cell temperature is lower than the first preset temperature, controlling the fan to operate according to the first duty ratio.
6. The thermal management control method according to claim 5, wherein after the step of searching the first duty ratio of the fan in the driving system corresponding to the operation parameter information from a preset storage module according to the operation parameter information, the method further comprises:
when the battery core temperature reaches the first preset temperature and the second loop is conducted, acquiring the temperature of cooling liquid for cooling the power battery;
searching a second duty ratio of the fan corresponding to the temperature of the cooling liquid from the preset storage module according to the temperature of the cooling liquid, wherein the preset storage module stores a corresponding relation between the temperature of the cooling liquid and the second duty ratio in advance;
and when the second duty ratio is larger than or equal to the first duty ratio, controlling the fan to operate according to the second duty ratio.
7. The thermal management control method according to claim 3,
the first preset temperature is any value within the range of 30-34 ℃;
the second preset temperature is any value within the range of 10-15 ℃;
the third preset temperature is any value within the range of minus 3 ℃ to minus 5 ℃;
the fourth preset temperature is any value within the range of 35-38 ℃.
8. The thermal management control method according to claim 5,
the operation parameter information comprises vehicle speed, air conditioner pressure and the temperature of cooling liquid in the driving system.
9. A thermal management control system for cooling a power cell, comprising:
the acquisition module is used for acquiring the cell temperature of a power battery of a vehicle and the environmental temperature of the environment where the power battery is located; and
a control module comprising a memory and a processor, the memory having stored therein a computing program, the computing program when executed by the processor being for implementing the thermal management control method according to any of claims 1-7.
10. The thermal management control system of claim 9, further comprising:
the battery cooling valve is provided with an inlet, a first outlet and a second outlet, wherein the first outlet is communicated with or disconnected from the inlet, the first loop is conducted when the inlet is communicated with the first outlet and disconnected from the second outlet, the second loop is conducted when the inlet is communicated with the second outlet and disconnected from the first outlet, a battery radiator is arranged in the second loop, and the battery radiator and a fan in the driving system are arranged in parallel.
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