CN109599634B

CN109599634B - Temperature adjusting method and temperature adjusting system for vehicle-mounted battery

Info

Publication number: CN109599634B
Application number: CN201710945133.XA
Authority: CN
Inventors: 伍星驰; 谈际刚; 王洪军
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2021-01-01
Anticipated expiration: 2037-09-30
Also published as: CN109599634A

Abstract

The invention discloses a temperature adjusting method and a temperature adjusting system of a vehicle-mounted battery, wherein the temperature adjusting system of the vehicle-mounted battery comprises a vehicle-mounted air conditioning module, a battery thermal management module and a controller, and the vehicle-mounted air conditioning module comprises a first refrigeration branch, a second refrigeration branch, a first battery cooling branch and a second battery cooling branch; the battery thermal management module comprises a first battery thermal management module and a second battery thermal management module; the semiconductor heat exchange module comprises a first end and a second end. The controller is used for obtaining the temperatures of the batteries, judging whether the temperature difference among the batteries is larger than a preset temperature threshold value or not, and balancing the temperatures of the batteries when the temperature difference among the batteries is larger than the preset temperature threshold value, so that the cycle life of the batteries can be prolonged.

Description

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

Technical Field

The present invention relates to the field of automotive technologies, and in particular, to a method for adjusting the temperature of a vehicle-mounted battery, a non-transitory computer-readable storage medium, and a system for adjusting the temperature of a vehicle-mounted battery.

Background

Currently, an on-board battery system in an electric vehicle may include a plurality of batteries, and the batteries are arranged at different positions, or heating/cooling power provided by a battery temperature regulation system for each battery is not uniform, so that the temperature of each battery is greatly different, the temperature uniformity of the batteries is poor, and the cycle life of the batteries is reduced.

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, a first object of the present invention is to provide a vehicle-mounted battery temperature control system that can equalize the temperatures of a plurality of batteries through a semiconductor heat exchange module when the temperature difference between the plurality of batteries is large, thereby improving the cycle life of the batteries.

A second object of the present invention is to provide a method for adjusting the temperature of a vehicle-mounted battery.

A third object of the invention is to propose a non-transitory computer-readable storage medium.

In order to achieve the above object, an embodiment of a first aspect of the present invention provides a temperature adjustment system for a vehicle-mounted battery, including: the vehicle-mounted air conditioning module comprises a first refrigeration branch 101, a second refrigeration branch, a first battery cooling branch and a second battery cooling branch, wherein the first refrigeration branch comprises a first compressor, the second refrigeration branch comprises a second compressor, the first battery cooling branch comprises a first heat exchanger, the second battery cooling branch comprises a second heat exchanger, the first compressor is respectively connected with the first heat exchanger and the second heat exchanger through a first flow regulating part to form a loop, and the second compressor is respectively connected with the first heat exchanger and the second heat exchanger through a second flow regulating part to form a loop; a battery thermal management module comprising a first battery thermal management module and a second battery thermal management module; the semiconductor heat exchange module comprises a first end and a second end, wherein the heat exchange branch of the first battery and the first battery heat management module can be selectively communicated with at least one of the first heat exchanger and the first end of the semiconductor heat exchange module to form a heat exchange flow path, and the heat exchange branch of the second battery and the second battery heat management module can be selectively communicated with at least one of the second heat exchanger and the second end of the semiconductor heat exchange module to form a heat exchange flow path; and the controller is used for acquiring the temperatures of the two batteries, judging whether the temperature difference between the two batteries is greater than a preset temperature threshold value or not, and balancing the temperatures of the two batteries when the temperature difference between the two batteries is greater than the preset temperature threshold value. According to the temperature adjusting system of the vehicle-mounted battery, the temperatures of the two batteries are obtained through the controller, whether the temperature difference between the two batteries is larger than the preset temperature threshold value or not is judged, and when the temperature difference between the two batteries is larger than the preset temperature threshold value, the temperatures of the two batteries are balanced. Therefore, the system can equalize the temperatures of the two batteries when the temperature difference between the two batteries is large, so that the cycle life of the batteries can be prolonged.

In order to achieve the above object, a second aspect of the present invention provides a temperature adjustment method for a vehicle-mounted battery, including: acquiring the temperatures of the two batteries; judging whether the temperature difference between the two batteries is greater than a preset temperature threshold value or not; and if the temperature of the two batteries is larger than the preset temperature threshold, balancing the temperatures of the two batteries.

According to the temperature adjusting method of the vehicle-mounted battery, the temperatures of the two batteries are obtained firstly, then whether the temperature difference between the two batteries is larger than the preset temperature threshold value or not is judged, and if the temperature difference between the two batteries is larger than the preset temperature threshold value, the temperatures of the two batteries are balanced, so that the cycle life of the batteries can be prolonged.

To achieve the above object, a non-transitory computer-readable storage medium is provided according to a third embodiment of the present invention, on which a computer program is stored, the computer program implementing the temperature adjustment method when executed by a processor.

The non-transitory computer-readable storage medium of the embodiment of the invention first obtains the temperatures of the two batteries, then judges whether the temperature difference between the two batteries is greater than a preset temperature threshold, and balances the temperatures of the two batteries if the temperature difference is greater than the preset temperature threshold, so that the cycle life of the batteries can be prolonged.

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,

FIGS. 1a-1b are block schematic diagrams of a vehicle battery thermostat system according to one embodiment of the invention;

FIG. 2 is a control topology of a vehicle battery thermostat system according to one embodiment of the invention;

3a-3b are block schematic diagrams of a vehicle battery thermostat system according to another embodiment of the invention;

FIGS. 4a-4b are block schematic diagrams of a vehicle battery thermostat system according to yet another embodiment of the invention

FIG. 5 is a schematic view of an outlet according to one embodiment of the present invention;

FIG. 6 is a flow chart of a method of regulating the temperature of an on-board battery according to one embodiment of the present invention;

fig. 7 is a flowchart of a temperature adjustment method of a vehicle-mounted battery according to still another 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.

A temperature adjustment method, a non-transitory computer-readable storage medium, and a temperature adjustment system of an in-vehicle battery proposed by an embodiment of the present invention are described below with reference to the drawings.

FIGS. 1a-1b are block schematic diagrams of a vehicle battery thermostat system according to one embodiment of the invention. As shown in fig. 1a-1b, the system comprises: the vehicle-mounted air conditioning module, the battery thermal management module, the semiconductor heat exchange module 3 and a controller (not specifically shown in the figure).

The vehicle-mounted air conditioning module comprises a first refrigeration branch 101, a second refrigeration branch 102, a first battery cooling branch 201 and a second battery cooling branch 202, wherein the first refrigeration branch 101 comprises a first compressor 11, the second refrigeration branch 102 comprises a second compressor 12, the first battery cooling branch 201 comprises a first heat exchanger 21, the second battery cooling branch 202 comprises a second heat exchanger 22, the first compressor 11 is connected with the first heat exchanger 21 and the second heat exchanger 22 through a first flow regulating part to form a loop, and the second compressor 21 is connected with the first heat exchanger 21 and the second heat exchanger 22 through a second flow regulating part to form a loop. The battery thermal management module includes a first battery thermal management module 51 and a second battery thermal management module 52. The semiconductor heat exchange module 3 comprises a first end and a second end, wherein the heat exchange branch of the first battery and the first battery heat management module 51 can be selectively communicated with at least one of the first heat exchanger 21 and the first end of the semiconductor heat exchange module 3 to form a heat exchange flow path, and the heat exchange branch of the second battery and the second battery heat management module 52 can be selectively communicated with at least one of the second heat exchanger and the second end of the semiconductor heat exchange module 3 to form a heat exchange flow path. The controller is used for obtaining the temperatures of the two batteries, judging whether the temperature difference between the two batteries is larger than a preset temperature threshold value or not, and balancing the temperatures of the two batteries when the temperature difference between the two batteries is larger than the preset temperature threshold value.

Further, the second end of the first battery thermal management module 51 is connected to the second end of the first heat exchanger 21 and the second end of the heating end of the semiconductor heat exchange module 3 through a second three-way valve 72. A first end of the second battery thermal management module 52 is connected to a first end of the second heat exchanger 22 and a first end of the cooling end of the semiconductor heat exchange module 3 through a third three-way valve 73, and a second end of the second battery thermal management module 52 is connected to a second end of the second heat exchanger 22 and a second end of the cooling end of the semiconductor heat exchange module 3 through a fourth three-way valve 74.

The controller is used for connecting the battery with low temperature with the heating end in the semiconductor heat exchange module 3 by controlling the power supply direction, and connecting the battery with high temperature with the cooling end in the semiconductor heat exchange module 3, the battery manager is further used for generating balanced required power according to the temperature difference between the two batteries and the target time t, and the semiconductor heat exchange module 3 is further used for balancing the temperatures of the two batteries according to the balanced required power. The target time t may be preset according to actual conditions, and may be 1 hour, for example.

It is understood that a battery refers to an energy storage device that is mounted on a vehicle and that can be repeatedly charged to provide power output for the vehicle and to provide power to other electrical devices on the vehicle. The battery can be a battery pack or a battery module.

Specifically, the heating power/cooling power required for equalizing the required power, i.e., adjusting the temperature difference between the two batteries to within a predetermined range, for example, within 3 ℃. The semiconductor heat exchange module 3 has a heating end and a cooling end, and the heating end and the cooling end are end-exchanged when the power supply is reversely connected. Fig. 1a is a schematic diagram of a forward power supply temperature regulation system of a semiconductor heat exchange module 3, and fig. 1b is a schematic diagram of a reverse power supply temperature regulation system of the semiconductor heat exchange module.

As shown in fig. 2, the controller may include a battery manager, a battery thermal management controller, an in-vehicle air conditioning controller, and a semiconductor controller. The battery manager may communicate with a semiconductor Controller via a CAN (Controller Area Network). The battery manager is used for managing the batteries, can detect information such as voltage, current and temperature of each battery, and when the temperature difference between the batteries exceeds a preset temperature threshold value, the battery manager sends battery temperature equalization function starting information to the vehicle-mounted air conditioner controller, and when the temperature difference between the batteries meets requirements, for example, the temperature difference between the batteries is less than 3 ℃, the battery temperature equalization completion information is sent. The battery manager can also estimate the heating parameters of the power battery according to the current battery temperature and current parameters and the average current within a period of time, and can estimate the equilibrium required power P3 according to the current temperature difference between the two batteries and the target time and send the equilibrium required power P3 to the vehicle-mounted air conditioner controller. The vehicle-mounted air conditioner controller CAN be in CAN communication with the semiconductor controller and the battery thermal management controller, and the vehicle-mounted air conditioner controller CAN transmit battery temperature equalization function starting information and equalization required power P3 to the semiconductor controller and the battery thermal management controller after receiving the battery manager.

The semiconductor controller CAN perform CAN communication with the vehicle-mounted air conditioner controller and the battery thermal management controller to determine whether the battery temperature equalization function needs to be started, and the semiconductor controller CAN control the power supply direction and power of the semiconductor heat exchange module 3. When a large temperature difference exists between the two batteries, for example, the temperature difference exceeds 8 ℃, the semiconductor controller controls the semiconductor heat exchange module 3 to enter a battery temperature equalization working mode. The cooling end of the semiconductor heat exchange module 3 is connected into the heat exchange flow path of the battery with higher temperature, the heating end is connected into the heat exchange flow path of the battery with lower temperature, so that the battery with higher temperature is cooled, the battery with lower temperature is heated, heat exchange is carried out between the battery with higher temperature and the battery with lower temperature, and the semiconductor heat exchange module 3 improves the heat exchange rate between the batteries. For example, fig. 1a shows that the temperature of the first battery 41 is lower and the temperature of the second battery 42 is higher; fig. 1b shows that the temperature of the first battery 41 is higher and the temperature of the second battery 42 is lower. The temperature balance of the battery can be completed by changing the power supply direction of the semiconductor heat exchange module 3. The battery cooling liquid directly flows into the semiconductor heat exchange module 3, and the heat exchange efficiency of the battery can also be improved. In the process of heating/cooling the battery, the semiconductor heat exchange module 3 also adjusts the heating power/cooling power according to the balance required power in real time so as to complete the temperature balance of the battery within the target time. The equilibrium power demand P3 includes a heating power demand P3a and a cooling power demand P3b, and when the mass, the internal resistance and the current are the same between the two batteries, the battery manager may be according to the formula:

generating a mean cooling demand power P3 b; when heating the battery, the battery manager may:

and generates the heating demand power P3 a. Wherein, Delta T₁Is two batteriesThe temperature difference between the cells, t is the target time, C is the specific heat capacity of the cell, M is the mass of the cell, I is the current of the cell, and R is the internal resistance of the cell.

When the mass, the current, and the internal resistances of the two batteries are not equal, taking as an example that the first battery temperature is lower, the second battery temperature is higher, the first battery needs to be heated, and the second battery needs to be cooled, the battery manager may calculate the heating required power P3a according to the following formula (1) and the cooling required power P3b according to the following formula (2):

（1）

（2）

wherein, Delta T₁Is the temperature difference between two batteries, t is the target time, C is the specific heat capacity of the battery, M₁Mass of the first cell, M₂Is the mass of the second cell, I₁Is the current of the first cell, I₂Is the current of the second cell, R₁Is the internal resistance of the first cell, R₂The temperature of the first battery 41 is changed to the internal resistance of the second battery

The temperature change of the second battery 42 is:

。

in the control method of the formula, the current heat generation of the battery is completely counteracted, so that the battery temperature with higher temperature does not rise in the whole battery temperature balancing process, but the power required by balancing is higher.

Another way of regulating is described below, namely, only considering reducing the temperature difference between the batteries as soon as possible, and not guaranteeing whether the temperature of the batteries will rise. This case is suitable for a case where the battery temperature is not so high and the temperature difference between the batteries is large, and it is not necessary to restrict the temperature of the batteries from rising. The specific calculation formula is as follows:

assuming that the first battery 41 needs to be cooled and the second battery 42 needs to be heated when the temperature of the first battery 41 is higher than that of the second battery 42, the difference of the heat generation power caused by the difference of the currents between the two batteries is as follows

The battery manager may calculate the heating required power P3a according to the following equation (3) and the cooling required power P3b according to equation (4):

（3）

（4）

i.e. P3a = P3b

Wherein, Delta T₁Is the temperature difference between two batteries, t is the target time, C is the specific heat capacity of the battery, M₁Mass of the first cell, M₂I1 is the current of the first cell, I is the mass of the second cell₂Is the current of the second cell, R₁Is the internal resistance of the first cell, R₂Is the internal resistance of the second battery.

After entering the battery temperature equalization operation mode, the controller may adjust the power of the semiconductor heat exchange module 3 according to the larger value of the heating required power P3a and the cooling required power P3 b. For example, P3a is more than or equal to P3b, the semiconductor heat exchange module 3 operates according to the heating demand power P3 a; if P3a < P3b, semiconductor heat exchange module 3 operates at cooling demand power P3 b. Or the semiconductor heat exchange module adjusts the working power, if P1a is more than or equal to P3b, the semiconductor heat exchange module 3 can operate according to the power which is more than the heating required power P3 a; if P3a < P3b, semiconductor heat exchange module 3 operates at power greater than cooling demand P3 b. Meanwhile, in the process of battery temperature equalization, the heating power of the heating end of the semiconductor heat exchange module is ensured to be more than or equal to P3a, and the cooling power of the cooling end is ensured to be more than or equal to P3b, so that the heating end and the cooling end both meet the requirement of temperature equalization power.

It can be understood that, in the present invention, when the power of the semiconductor heat exchange module 3 is increased, the cooling power of the cooling end and the heating power of the heating end can be increased at the same time.

As shown in fig. 1a-1b, each battery thermal management module includes a pump 502, a first temperature sensor 504, a second temperature sensor 505, and a flow rate sensor 506, a heater 501, and a medium container 503, which are disposed on the heat exchange flow path, as shown in fig. 1a-1 b; wherein: the pump 502 is used to flow the medium in the heat exchange flow path; the first temperature sensor 504 is used to detect the inlet temperature of the medium flowing into the vehicle-mounted battery; the second temperature sensor 505 is used to detect the outlet temperature of the medium flowing out of the vehicle-mounted battery; the flow rate sensor 506 detects the flow rate of the medium in the heat exchange flow path; the medium container 503 is used for storing and supplying a medium to the heat exchange flow path; the heater 501 is used to heat the medium in the heat exchange flow path.

Further, according to an embodiment of the present invention, the controller is further configured to: the temperature of the two batteries is acquired, the temperature adjusting system is controlled to enter a cooling mode when the temperature of any one battery is larger than a first temperature threshold value, and the temperature adjusting system is controlled to enter a heating mode when the temperature of any one battery is smaller than a second temperature threshold value. Wherein the first temperature threshold is greater than the second temperature threshold, for example, the first temperature threshold may be 40 ℃ and the second temperature threshold may be 0 ℃.

The controller is also used for acquiring the temperature regulation actual power P2 and the temperature regulation required power P1 of the two batteries, and regulating the temperature of the two batteries according to the temperature regulation actual power P2 and the temperature regulation required power P1 of the two batteries.

Specifically, as shown in fig. 1a-1b, the vehicle air conditioner includes a battery cooling branch and a refrigeration branch, each battery corresponds to one refrigeration branch, namely a first refrigeration branch 101 and a second refrigeration branch 102, and each refrigeration branch includes a compressor and a condenser 10 for providing refrigeration power. Each heat exchanger comprises two pipelines, wherein a first pipeline and a second pipeline are mutually independent and adjacently arranged, so that media (flowing media such as refrigerants, water, oil and air or media such as phase change materials or other chemicals) in the pipelines are mutually independent, the media in the first pipeline and the second pipeline can exchange heat with each other, the first pipeline is connected with a compressor, the second pipeline is connected with a battery thermal management module, the refrigerants flow in the first pipeline, and the cooling liquid flows in the second pipeline. Each battery cooling branch comprises an electronic valve and an expansion valve, the opening and the closing of each battery cooling branch are controlled by controlling the opening and the closing of the electronic valve, and the flow of the cooling liquid of the battery cooling branch is controlled by controlling the opening of the expansion valve so as to control the cooling power of the corresponding battery cooling branch.

As shown in fig. 1a-1b, the first flow regulating member may include a first regulating valve 71 and a second regulating valve 72, and the second flow regulating member may include a third regulating valve 73 and a fourth regulating valve 74. That is, the first battery cooling branch 201 may further include a first regulating valve 71 and a third regulating valve 73; the second battery cooling branch 202 may further include a second regulating valve 72 and a fourth regulating valve 74, the first compressor 11 is connected to the first heat exchanger 21 through the first regulating valve 71 to form a loop, the first compressor 11 is connected to the second heat exchanger 22 through the second regulating valve 72 to form a loop, the second compressor 12 is connected to the first heat exchanger 21 through the third regulating valve 73 to form a loop, and the second compressor 12 is connected to the second heat exchanger 11 through the fourth regulating valve 74 to form a loop.

As shown in fig. 1a to 1b, the first compressor 11 and the second compressor 12 are connected to each other at their refrigerant inlets, and the two compressors are associated with each other. The cooling capacity of each compressor can be distributed to the first battery cooling branch 201 or the second battery cooling branch 202 by adjusting the first to fourth adjustment valves 71 to 74. For example, the compressor 11 of the first cooling branch 101 may distribute the refrigerant to the first battery cooling branch 201 via the first regulating valve 71, and distribute the refrigerant to the second battery cooling branch 202 via the second regulating valve 72. The compressor 12 in the second cooling branch 102 may distribute the refrigerant to the first battery cooling branch 201 via the third regulating valve 73, and distribute the refrigerant to the second battery cooling branch 202 via the fourth regulating valve 74. The opening degrees of the first to fourth regulating valves 71 to 74 are controlled by the controller.

The controller can equalize the temperatures of the two batteries by adjusting the opening degrees of the first to fourth adjusting valves 71 to 74 while controlling the flow rates of the cooling liquids of the two cooling branch circuits of the first battery 41 and the second battery 42. When the temperature adjusting system is operated in the cooling mode, as shown in fig. 1a-1b, the controller may calculate temperature adjustment required powers P1 of the first battery 41 and the second battery 42, respectively, and then adjust the opening degree of the corresponding second expansion valve according to the P1 of each battery and the maximum cooling power P of the compressor, respectively. During the cooling process, the controller also adjusts the actual power P2 according to the temperature of each battery respectively to continuously adjust the opening degree of the second expansion valve. Meanwhile, the controller adjusts the flow distribution of the cooling liquid of the first battery cooling branch 201 and the second battery cooling branch 202 by adjusting the opening degrees of the first to fourth adjusting valves 71 to 74 according to the temperature conditions between the first battery 41 and the second battery 42, so as to achieve the balance of controlling the temperatures of the first battery 41 and the second battery 42. Wherein, when the temperature of the first battery 41 is higher than the temperature of the second battery 42 and the difference exceeds the set value, the opening degrees of the first and third regulating valves 71 and 73 may be increased, and the opening degrees of the second and fourth regulating valves 72 and 74 may be decreased to increase the cooling power of the first battery 41; when the temperatures of the first battery 41 and the second battery 42 are equal, the opening degrees of the first to fourth regulating valves 71 to 74 can be controlled to be the same. When the temperature adjusting system operates in the heating mode, and when the temperature of the first battery 41 is lower than the temperature of the second battery 42 and the difference value exceeds the set value, the controller increases the heating power of the heater 501 corresponding to the first battery 41. Thereby, the temperature balance between the two batteries can be maintained.

The first flow regulating member and the second flow regulating member may also be replaced by a three-way valve, which is not described in detail.

When the temperature of battery was too high, on-vehicle air conditioner refrigeration function was opened, and battery cooling function starts, and the flow direction of coolant liquid in refrigerant and the second pipeline respectively is in the first pipeline: compressor-condenser-regulating valve-electronic valve-expansion valve-heat exchanger-compressor; the heat exchanger-battery heat management module-battery heat management module-heat exchanger. Of course, when the temperature of the battery is low, the battery heating function is turned on, the heater is turned on, and the heater heats the cooling liquid to provide heating power while keeping the electronic valve closed.

The controller also obtains the temperature regulation required power P1 and the temperature regulation actual power P2 of the battery in real time, wherein the temperature regulation required power P1 is to regulate the temperature of the battery to a set target temperature within a target time, the temperature regulation power required to be provided for the battery is obtained, the battery temperature regulation actual power P2 is the actual power, the target temperature and the target time obtained by the battery when the temperature of the battery is regulated currently are set values, and can be preset according to the actual condition of the vehicle-mounted battery, for example, when the battery is cooled, the target temperature can be set to about 35 ℃, and the target time can be set to 1 hour. The controller can adjust the refrigerating power of the compressor according to the temperature adjusting required power P1 and the temperature adjusting actual power P2 of the battery, so that the temperature of the battery can be adjusted within a target time, the temperature of the vehicle-mounted battery is maintained within a preset range, and the situation that the performance of the vehicle-mounted battery is influenced due to overhigh or overlow temperature is avoided.

According to an example of the invention, the vehicle-mounted battery temperature regulation system further comprises a battery state detection module electrically connected with the controller, and the battery state detection module is used for detecting the current of the vehicle-mounted battery. The battery state detection module may be a current hall sensor.

How to obtain the temperature-adjustment actual power P2 and the temperature-adjustment required power P1 of the battery is described below with reference to specific embodiments.

According to an 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, respectively.

Further in accordance with one implementation of the present inventionFor example, the first parameter is an initial temperature and a target temperature at which the battery opening 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 (7):

ΔT₁*C*M/t （7），

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 4, and M is the mass of the battery 4.

The second parameter is the average current I of the battery 4 in the preset time, and the controller generates the second temperature regulation required power through the following formula (8):

I²*R，（8），

wherein I is the average current and R is the internal resistance of the battery.

Specifically, the charge and discharge current parameters of the battery can be detected by the current hall sensor, and the controller can estimate the average current of the battery according to the current parameters of the battery in a period of time.

When cooling the battery, P1= Δ T₁*C*M/t+I²R; when heating the battery, 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 according to the inlet temperature detected by the first temperature sensor 504 and the outlet temperature detected by the second temperature sensor 505, respectively₂And according to the second temperature difference DeltaT of each battery₂And the flow rate v detected by the flow rate sensor 506 generates the temperature-adjusted actual power P2 of the battery.

Further, according to an embodiment of the present invention, the temperature-adjusted actual power P2 is generated by the following formula: p2= Δ T₂C m, wherein Δ T₂Is the second temperature difference, c is the specific heat capacity of the medium in the flow path, and m is the unit timeMass of the medium flowing through the cross-sectional area of the flow path, where m = v ρ s, v is the flow velocity of the medium, ρ is the density of the medium, and s is the cross-sectional area of the flow path.

Specifically, after the vehicle is powered on, the controller judges whether the battery needs to be temperature-regulated, if the temperature of a certain battery is too high or too low, the temperature regulation function is started, low-rotation-speed information is sent to the pump, and the pump starts to work at a default rotation speed (such as a low rotation speed). Then, the controller obtains an initial temperature (i.e., a current temperature) of each battery, a target temperature, and a target time t from the initial temperature to the target temperature, where the target temperature and the target time t may be preset according to an actual situation, and may calculate a first temperature adjustment required power of each battery according to formula (7). Meanwhile, the controller obtains the average current I of each battery in a preset time, and may calculate the second temperature adjustment required power of each battery according to equation (8). Then, the controller may calculate 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) from the first temperature adjustment required power and the second temperature adjustment required power of each battery, where P1= Δ T when cooling the battery₁*C*M/t+I²R, when heating the cell, P1= Δ T₁*C*M/t-I²R. The controller acquires temperature information detected by the first temperature sensor and the second temperature sensor, and acquires flow rate information detected by the flow rate sensors, according to the formula P2= Δ T₂C m may calculate the temperature regulated actual power P2 for each cell.

Specifically, as shown in fig. 2, the controller in the temperature regulation system of the vehicle-mounted battery may include: the controller comprises a battery thermal management controller, a vehicle-mounted air conditioner controller, a battery manager and a semiconductor controller, wherein the battery thermal management controller CAN be electrically connected with a first temperature sensor 504, a second temperature sensor 505 and a flow rate sensor 506, CAN communicate with a pump 502 and a heater 501, obtains temperature regulation actual power P2 according to the specific heat capacity of a medium, the density of the medium and the cross-sectional area of a flow path, controls the rotating speed of the pump 502 and the power of the heater 501, and CAN communicate with the vehicle-mounted air conditioner controller in a CAN mode. The battery manager is used for managing the battery, detecting information such as voltage, current and temperature of the battery, acquiring temperature regulation required power P1 according to target temperature and target time t of the battery, specific heat capacity C of the battery, mass M of the battery, internal resistance R and current I of the battery, and performing CAN communication with the vehicle-mounted air conditioner controller, so that the vehicle-mounted air conditioner controller CAN regulate the power of the compressor and the opening degree of the expansion valve according to the temperature regulation required power P1 and the temperature regulation actual power P2.

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 502 is primarily used to provide power, the media container 503 is primarily used to store coolant and to receive coolant added to the temperature regulation system, and the coolant in the media container 503 can be automatically replenished when the coolant in the temperature regulation system is reduced. The first temperature sensor 504 is used for detecting the temperature of the cooling fluid at the inlet of the flow path, and the second temperature sensor 505 is used for detecting the temperature of the cooling fluid at the outlet of the flow path. Flow rate sensor 506 is used to detect information about the flow rate of cooling fluid in the piping in the temperature regulation system. That is, the battery thermal management controller adjusts the flow rate information of the cooling liquid in the pipe in the system based on the temperature of the flow path inlet cooling liquid detected by the first temperature sensor 504, the temperature of the flow path outlet cooling liquid detected by the second temperature sensor 505, and the flow rate information of the cooling liquid in the pipe in the temperature adjustment system detected by the flow rate sensor 506, according to the formula P2= Δ T₂C m, the temperature regulating actual power P2 of each battery can be calculated.

How the vehicle air conditioner adjusts the temperature of the battery according to the temperature adjustment actual power P2 and the temperature adjustment required power P1 of the battery will be described below with reference to specific embodiments.

According to an embodiment of the present invention, when the temperature regulation system operates in the cooling mode, the controller is further configured to increase the cooling power of the compressor when the temperature regulation actual power P2 of a certain battery is less than the battery temperature regulation required power P1; when the temperature adjusting system is operated in the heating mode, the controller is also configured to increase the heating power of the heater when the temperature adjusting actual power P2 of a certain battery is less than the battery temperature adjusting required power P1.

That is, in cooling the batteries, if the temperature-adjustment actual power P2 of any one of the batteries is less than the battery temperature-adjustment required power P1, the controller may increase the cooling power of the corresponding compressor while increasing the opening degree of the expansion valve to increase the opening degree of the battery cooling branch, thereby increasing the temperature-adjustment actual power P2 so that the batteries can complete temperature adjustment within the target time. When the batteries are heated, if the temperature-adjustment actual power P2 of any one of the batteries is less than the battery temperature-adjustment required power P1, the controller may increase the heating power of the corresponding heater 501, thereby increasing the temperature-adjustment actual power P2 so that the batteries can complete temperature adjustment within the target time.

According to an embodiment of the invention, as shown in fig. 1a-1b, the controller may be further configured to: when the temperature regulation system is operated in the cooling mode and the temperature of the first battery 41 is greater than the temperature of the second battery 42, the opening degree of the first battery cooling branch 201 may be increased and the opening degree of the second battery cooling branch 202 may be decreased to achieve temperature equalization of the first battery and the second battery, and when the temperature regulation system is operated in the cooling mode and the temperature of the second battery 42 is greater than the temperature of the first battery 41, the opening degree of the second battery cooling branch 202 may be increased and the opening degree of the first battery cooling branch 201 may be decreased to achieve temperature equalization of the first battery and the second battery.

Specifically, if the temperature of one battery is higher than 40 ℃, the cooling function of the temperature regulation system is started, and the battery manager sends the starting information of the cooling function of the battery to the vehicle-mounted air conditioner controller. The battery manager collects current battery temperature and current parameters, estimates heating parameters of the battery according to average current in a period of time, estimates temperature regulation required power P1 of the battery according to the difference between the current average temperature of the battery pack and the target temperature of the battery and the average current of the battery, and sends the battery cooling required power to the vehicle-mounted air conditioner controller. While the battery manager sends the number of the battery that needs to be cooled.

If the battery manager detects that the temperature of the first battery 41 is lower than 35 deg.c, the battery manager transmits a cooling completion message of the first battery 41. If the battery manager detects that the temperature of the second battery 42 is lower than 35 deg.c, the battery manager transmits the cooling completion information of the second battery 42. If it is detected that the temperature of the first battery 41 is higher than the temperature of the second battery 42 by more than 3 c, the battery manager transmits a message to increase the cooling power of the first battery 41. If the temperature of the second battery 42 is higher than the temperature of the first battery 41 by more than 3 c, the battery manager transmits a message to increase the battery cooling power of the second battery 42.

And if the battery manager detects that the temperatures of the 2 batteries are lower than 35 ℃, the batteries are cooled completely, and the battery manager sends battery cooling completion information to the vehicle-mounted air conditioner. If the temperature of the battery remains above 35 ℃ after the cooling function has been turned on for 1 hour, the battery manager increases the battery cooling power requirement.

If the temperature of one battery is lower than 0 ℃, the heating function of the temperature regulating system of the vehicle-mounted battery of the temperature regulating system is started. The battery manager collects current battery temperature and current parameters, estimates heating parameters of the battery according to average current within a period of time, estimates temperature regulation required power P1 of the power battery according to a difference value between actual temperature of the battery and target temperature of the battery and the average current of the battery, and sends the temperature regulation required power P1 to the battery thermal management controller, so that the battery thermal management controller controls the heater 501 to perform heating work according to the temperature regulation required power P1.

If the battery manager detects that the temperature of the first battery 41 is higher than 10 deg.c, the battery manager transmits a heating completion message of the first battery 41. If the battery manager detects that the temperature of the second battery 42 is higher than 10 deg.c, the battery manager transmits a heating completion message of the second battery 42. If it is detected that the temperature of the first battery 41 is lower than the temperature of the second battery 4 by more than 3 ℃, the battery manager sends a message to increase the battery heating power of the first battery 41. If it is detected that the temperature of the second battery 42 is lower than the electrical temperature of the first battery 41 by more than 3 c, the battery manager sends a message to increase the heating power of the second battery 42.

And if the battery manager detects that the temperatures of the 2 batteries are higher than 10 ℃, the batteries are heated, and the battery manager sends battery heating completion information to the battery management controller. If the temperature of the battery is still below 10 ℃ after the heating function is turned on for 2 hours, the battery manager increases the heating power of the heater.

If the temperature of the battery is between 0 ℃ and 40 ℃ and the temperature difference between the first battery and the second battery 42 exceeds 8 ℃, the battery manager transmits battery temperature equalization function start information. The battery manager collects the temperature difference and the target equalization time between the current batteries, estimates the temperature equalization power required by the battery pack, and sends the battery temperature equalization power demand information, so that the semiconductor heat exchange module of the semiconductor controller performs temperature equalization on the batteries according to the battery temperature equalization power demand information. In the starting process of the battery temperature balancing function, if the battery manager detects that the starting condition of the battery heating function is met, the battery manager exits the temperature balancing function and enters the battery heating function. And if the battery manager detects that the starting condition of the battery cooling function is met, the battery manager exits the temperature balancing function and enters the battery cooling function. If the difference between the average temperatures of the first battery 41 and the second battery 42 is less than 3 ℃, the battery manager sends a battery temperature equalization function completion message.

After the vehicle-mounted air conditioner is powered on, if the vehicle-mounted air conditioner controller receives battery cooling function starting information sent by the battery manager, the battery cooling function is started, and the vehicle-mounted air conditioner controller sends the battery cooling function starting information to the battery thermal management controller. The vehicle-mounted air conditioner controller receives the temperature regulation required power P1 of the battery sent by the battery manager and forwards the information to the battery thermal management controller. During the battery cooling process, the in-vehicle air conditioning controller controls the first electronic valve 213 and the first expansion valve 212 to open. The vehicle-mounted air conditioner controller receives the water temperature information sent by the battery thermal management controller and the actual temperature regulation power P2 of the battery, and forwards the information to the battery manager and the semiconductor heat exchange module 3. During the cooling of the battery, the on-board air conditioning controller compares the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the battery, and if the temperature adjustment actual power P2 of the battery is smaller than the temperature adjustment required power P1, the on-board air conditioning controller controls to increase the cooling power. If the battery manager detects that the temperature of the first battery 41 is higher than the temperature of the second battery 42 by more than 3 ℃, the battery manager sends message information for increasing the cooling power of the first battery 41 to the vehicle air conditioner, and the vehicle air conditioner controller increases the opening degree of the first expansion valve 212 of the first battery cooling branch 201 and decreases the opening degree of the first expansion valve 212 of the second battery cooling branch 202 according to the message information for increasing the cooling power of the first battery 41, so that the cooling power of the first battery 41 is increased, and the cooling power of the second battery 42 is decreased, thereby reducing the battery temperature difference between the batteries. If the temperature of the second battery 42 is higher than the temperature of the first battery 41 by more than 3 ℃, the battery manager sends message information for increasing the battery cooling power of the second battery 42, and the in-vehicle air-conditioning controller increases the opening degree of the first expansion valve 212 of the second battery cooling branch 202 by the second and decreases the opening degree of the first expansion valve 212 of the first battery cooling branch 201 according to the message information for increasing the battery cooling power of the second battery 42, so that the cooling power of the first battery 41 is decreased, the cooling power of the second battery 42 is increased, and the battery temperature difference between the batteries is reduced.

In the battery cooling process, if the vehicle-mounted air conditioner controller receives the cooling completion information of the first battery 41 sent by the battery manager, the first electronic valve 213 of the first battery cooling branch 201 is controlled to be closed. And if the vehicle-mounted air conditioner controller receives the second battery cooling completion information sent by the battery manager, the first electronic valve 213 of the second battery cooling branch 202 is controlled to be closed. And if the vehicle-mounted air conditioner controller receives the battery cooling completion information sent by the battery manager, the battery cooling completion information is forwarded to the battery thermal management controller and the semiconductor heat exchange module, and the battery cooling is completed.

Besides, the cooling power can be provided for the battery through the vehicle-mounted air conditioner, and the cooling power can also be provided for the battery through the semiconductor heat exchange module.

According to an embodiment of the present invention, when the temperature adjustment system operates in the cooling mode and the temperature of the first battery is higher than the temperature of the second battery, the controller is further configured to control the power supply direction of the semiconductor heat exchange module and the opening/closing of the passages of the first to fourth three-way valves 71-74 to connect the cooling end of the semiconductor heat exchange module to the first heat exchanger 21 and connect the heating end of the semiconductor heat exchange module to the second heat exchanger 22, as shown in fig. 1 b; when the temperature regulation system is operated in the cooling mode and the temperature of the second battery is higher than that of the first battery, the controller is further configured to control the power supply direction of the semiconductor heat exchange module and the opening/closing of the passages of the first to fourth three-way valves 7171-74 to connect the cooling end of the semiconductor heat exchange module to the second heat exchanger 22 and the heating end of the semiconductor heat exchange module to the first heat exchanger 21, as shown in fig. 1 a.

Specifically, as shown in fig. 1a-1b, if the semiconductor controller receives battery cooling function start information sent by the vehicle-mounted air conditioning controller, the battery cooling function is started, and the semiconductor controller sends the battery cooling function start information to the battery thermal management controller. The semiconductor controller receives the temperature regulation required power P1 of each battery sent by the vehicle air conditioner. And the semiconductor controller receives the water temperature information sent by the battery thermal management controller and the temperature of each battery to adjust the actual power. In the process of starting the battery cooling function, if the semiconductor controller receives message information which is sent by the battery manager and used for increasing the battery cooling power of the first battery 41, that is, the temperature of the first battery 41 is higher than that of the second battery 42 by more than 3 ℃, the semiconductor controller controls the semiconductor heat exchange module 3 to supply power reversely, the battery thermal management controller controls the opening of the channel 1 and the channel 2 of the first three-way valve 71 and the second three-way valve 72, controls the opening of the channel 1 and the opening of the channel 2 of the third three-way valve 73 and the fourth three-way valve 74, so that the cooling end is connected to the circulation loop of the first battery 41, and the heating end is connected to the circulation loop of the second battery 42. If the semiconductor controller receives message information for increasing the cooling power of the second battery 42 sent by the battery manager, that is, the temperature of the second battery 42 is higher than that of the first battery 41 by more than 3 ℃, the semiconductor controller controls the semiconductor heat exchange module 3 to supply power in the forward direction, the battery thermal management controller controls the channel 1 and the channel 2 of the first three-way valve 71 and the second three-way valve 72 to be opened, and controls the channel 1 and the channel 2 of the third three-way valve 73 and the fourth three-way valve 74 to be opened, so that the cooling end is connected to the circulation loop of the second battery 42, and the heating end is connected to the circulation loop of the first battery 41. And if the semiconductor controller does not receive the information, cutting off the power supply of the semiconductor heat exchange module.

If the temperature of one battery is lower than 0 ℃, the heating function of the temperature regulating system is started. When the battery is heated, heating power can be supplied through the semiconductor heat exchange module in addition to the heater 501.

According to an embodiment of the present invention, when the temperature adjusting system is operated in the heating mode and the temperature of the first battery is lower than the temperature of the second battery, the controller is further configured to control the power supply direction of the semiconductor heat exchange module and the opening/closing of the passages of the first to fourth three-way valves 71 to 74 such that the heating side of the semiconductor heat exchange module is connected to the first heat exchanger 21 and the cooling side of the semiconductor heat exchange module is connected to the second heat exchanger 22. When the temperature regulation system is operated in a heating mode and the temperature of the second battery is lower than that of the first battery, the controller is also used for controlling the power supply direction of the semiconductor heat exchange module and the opening/closing of the passages of the first to fourth three-way valves 71-74 to connect the heating end of the semiconductor heat exchange module with the second heat exchanger 22 and connect the cooling end of the semiconductor heat exchange module with the first heat exchanger 21.

Specifically, if the semiconductor controller receives battery heating function starting information sent by the vehicle-mounted air conditioner, the battery heating function is started, and the semiconductor controller sends the battery heating function starting information to the battery thermal management controller. The semiconductor controller receives the temperature regulation required power P1 of the battery sent by the on-vehicle air conditioner. And the semiconductor controller receives information such as water temperature information sent by the battery thermal management controller, temperature adjustment actual power P2 of each power battery and the like. In the process of starting the battery heating function, if the semiconductor controller receives message information for increasing the heating power of the first battery 41 sent by the battery manager, that is, the temperature of the first battery 41 is lower than that of the second battery 4 by more than 3 ℃, the controller controls the semiconductor heat exchange module 3 to supply power in the forward direction, the channels 1 of the first three-way valve 71 and the second three-way valve 72 are opened, the channels 2 are closed, the channels 1 of the third three-way valve 73 and the fourth three-way valve 74 are opened, the channels 2 are closed, so that the heating end of the semiconductor heat exchange module is connected to the circulation loop of the first battery 41, and the cooling end of the semiconductor heat exchange module is connected to the circulation loop of the second battery. If the semiconductor controller receives message information of increasing the heating power of the second battery 42 sent by the battery manager, the controller controls the semiconductor heat exchange module 3 to supply power reversely, the channel 1 of the first three-way valve 71 and the second three-way valve 72 is opened, the channel 2 is closed, the channel 1 of the third three-way valve 73 and the fourth three-way valve 74 is opened, the channel 2 is closed, so that the heating end of the semiconductor heat exchange module is connected to the circulation loop of the second battery 42, and the cooling end of the semiconductor heat exchange module is connected to the circulation loop of the first battery 41. And if the semiconductor controller does not receive the information, cutting off the power supply of the semiconductor heat exchange module.

During the heating process of the semiconductor heater, if the temperature regulation required power P1 of the battery is greater than the temperature regulation actual power P2, the semiconductor heat exchange module increases the heating power.

It will be appreciated that when the cooling function is activated, the heater 501 is turned off. When the heating function is started, the heater 501 is turned on, the first electronic valve 213 is closed, and the passages 2 of the first to fourth three-way valves 71 to 74 are closed.

As shown in fig. 3a-3b, when the battery is cooled and the temperature of the first battery is higher than that of the second battery, the controller is further configured to change the power supply of the semiconductor heat exchange module 3, control the first to fourth three-way valves 71-74 to connect the cooling end of the semiconductor heat exchange module to the first heat exchanger 21, and control the fourth fan to operate, as shown in fig. 3 b; when the battery is cooled and the temperature of the second battery is higher than that of the first battery, the controller is further configured to change the power supply of the semiconductor heat exchange module 3, control the first to fourth three-way valves 71-74 to connect the cooling end of the semiconductor heat exchange module with the second heat exchanger 22, and control the third fan to operate, as shown in fig. 3 a.

The main difference between fig. 1a-1b and fig. 3a-3b is that a heat exchange fan is added in fig. 3a-3b, and in the scheme in fig. 1a-1b, two batteries need to be simultaneously connected into a circulation loop at one end of a semiconductor heat exchange module to realize temperature equalization, that is, one battery needs to be heated, the other battery needs to be cooled simultaneously, and fig. 1a-1b can quickly realize temperature equalization between the batteries. And 3a-3b, only one of the batteries can be controlled to be connected into the temperature equalization loop, and the other end of the battery is subjected to heat exchange with the external environment through the fan, that is, if the temperature of the first battery is higher, the first battery 41 can be connected into the cooling end alone, and the second battery 42 does not need to be connected into the heating loop, and the scheme of fig. 3a-3b can enable the second battery 42 to complete cooling more quickly.

Specifically, as shown in fig. 3a-3b, after the semiconductor heat exchange module is powered on, if the semiconductor controller receives battery cooling function starting information sent by the vehicle-mounted air conditioner controller, the battery cooling function is started, and the semiconductor controller sends the battery cooling function starting information to the battery thermal management controller. The semiconductor controller receives the temperature regulation required power P1 of each battery sent by the in-vehicle air conditioning controller. And the semiconductor controller receives the water temperature information sent by the battery thermal management controller and the temperature of each battery to adjust the actual power. In the process of starting the battery cooling function, if the semiconductor controller receives the message information of increasing the battery cooling power of the first battery 41 sent by the battery manager, that is, the temperature of the first battery 41 is higher than that of the second battery 42 by more than 3 ℃, the semiconductor controller controls the semiconductor heat exchange module 3 to supply power reversely, controls the

channels

1 and 2 of the first three-way valve 71 and the second three-way valve 72 to be opened, controls the channels 1 of the third three-way valve 73 and the fourth three-way valve 74 to be closed, and controls the channel 2 to be opened, so that the cooling end is connected to the circulation loop of the first battery 41, and controls the fourth fan to start working. If the semiconductor controller receives message information for increasing the cooling power of the second battery 42 sent by the battery manager, that is, the temperature of the second battery 42 is higher than that of the first battery 41 by more than 3 ℃, the semiconductor controller controls the semiconductor heat exchange module 3 to supply power in the forward direction, controls the

channels

1 and 2 of the first three-way valve 71 and the second three-way valve 72 to be closed and controls the

channels

1 and 2 of the third three-way valve 73 and the fourth three-way valve 74 to be opened, so that the cooling end is connected to the circulation loop of the second battery 42, and controls the third fan to start working. And if the semiconductor heat management module does not receive the information, the power supply of the semiconductor heat exchange module is cut off.

Specifically, as shown in fig. 3a-3b, during the starting process of the battery heating function, if the temperature of the first battery is lower than that of the second battery by more than 3 ℃, the semiconductor heat exchange module is controlled to supply power in the forward direction, the channels 1 of the first three-way valve 71 and the second three-way valve 72 are controlled to be opened, the channel 2 is controlled to be closed, the channels 1 of the third three-way valve 73 and the fourth three-way valve 74 are controlled to be closed, the channel 2 is controlled to be closed, so that the heating end is connected to the circulation loop of the first battery 41, and the fourth fan is controlled to start to operate (fig. 3 a). If the temperature of the second battery 42 is lower than that of the first battery 41 by more than 3 ℃, controlling the semiconductor heat exchange module 3 to supply power reversely, closing the channel 1 and the channel 2 of the first three-way valve 71 and the second three-way valve 72, and controlling the channel 1 and the channel 2 of the third three-way valve 73 and the fourth three-way valve 74 to be opened, so that the heating end is connected to the circulation loop of the second battery 42, and simultaneously controlling the third fan to start to work (fig. 3 b). And if the semiconductor heat management module does not receive the information, the power supply of the semiconductor heat exchange module is cut off.

According to an embodiment of the present invention, as shown in fig. 4a-4b, the system may further include in-vehicle cooling branches, each in-vehicle cooling branch includes an evaporator 31, and each evaporator 31 is connected in parallel with each heat exchanger and then connected in series with each compressor.

The in-vehicle cooling branch comprises a first in-vehicle cooling branch 301 and a second in-vehicle cooling branch 302, the controller is further configured to reduce the opening degree of the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 when the temperature of the battery reaches a third preset temperature, increase the opening degree of the first battery cooling branch 201 and the second battery cooling branch 202 at the same time, and further judge whether the temperature in the vehicle compartment reaches an air conditioner set temperature when the temperature of the battery reaches the third preset temperature, wherein if the air conditioner set temperature is reached, the opening degree of the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 is reduced, and the opening degree of the first battery cooling branch 201 and the opening degree of the second battery cooling branch 202 are increased at the same time. The third preset temperature may be preset according to actual conditions, and may be, for example, 45 ℃.

Further, as shown in fig. 5, the first in-vehicle cooling branch 301 corresponds to the first air outlet 100 and the second air outlet 200 in the vehicle compartment, and the second in-vehicle cooling branch 302 corresponds to the third air outlet 300 and the fourth air outlet 400 in the vehicle compartment, and the controller is further configured to: when the temperatures of the first outlet 100 and the second outlet 200 are higher than the temperatures of the third outlet 300 and the fourth outlet 400, the opening degree of the first in-vehicle cooling branch 301 is increased and the opening degree of the second in-vehicle cooling branch 302 is decreased, and when the temperatures of the first outlet 100 and the second outlet 200 are lower than the temperatures of the third outlet 300 and the fourth outlet 400, the opening degree of the second in-vehicle cooling branch 302 is increased and the opening degree of the first in-vehicle cooling branch 301 is decreased.

Specifically, as shown in fig. 4a-4b, each in-vehicle cooling branch includes: the evaporator 31, the second electronic valve 32, and the second expansion valve 33 are connected in series with each other, and the in-vehicle cooling branch is connected to the corresponding refrigeration branch. The second electronic valve 32 is used for controlling the opening and closing of the corresponding in-vehicle cooling branch, and the second expansion valve 33 is used for controlling the opening of the corresponding in-vehicle cooling branch. When cooling is needed in the compartment, the controller controls the second electronic valve 32 to open.

After the vehicle-mounted air conditioner is powered on, if the vehicle-mounted air conditioner controller receives battery cooling function starting information sent by the battery manager, the battery cooling function is started, and the vehicle-mounted air conditioner sends the battery cooling function starting information to the battery thermal management controller. The vehicle-mounted air conditioner controller receives the battery cooling power demand information (temperature regulation demand power P1) sent by the battery manager and forwards the information to the battery thermal management controller. In the battery cooling process, the vehicle-mounted air conditioner controller receives the water temperature information and the power battery pack actual cooling power information (temperature adjustment actual power P2) sent by the battery thermal management controller and forwards the information to the battery manager. In the process of cooling the battery, the vehicle-mounted air conditioner controller compares the battery cooling demand power with the actual battery cooling power information, if the actual battery temperature regulation power P2 is smaller than the battery temperature regulation demand power P1, whether the temperature of the battery reaches 45 ℃ (higher temperature) is judged, if the temperature of the battery reaches 45 ℃, the vehicle-mounted air conditioner controller reduces the opening degree of the second expansion valve 33, increases the opening degree of the first expansion valve 212, reduces the refrigerant flow of the in-vehicle cooling branch, increases the refrigerant flow of the battery cooling branch, and adjusts the cooling capacity distribution of the battery cooling and the in-vehicle cooling. And the vehicle-mounted air conditioner controller compares the temperature regulation actual power of the first cooling branch 201 and the second cooling branch 202 in real time, if the sum of the temperature regulation actual power P2 of a certain cooling branch is less than the sum of the temperature regulation required power P1 of two batteries, the opening degree of the second expansion valve 33 is reduced, the opening degree of the first expansion valve 212 is increased, and if the sum of the temperature regulation actual power P2 of two cooling branch circuits is more than or equal to the sum of the temperature regulation required power P1 of the two batteries, the opening degree of the first expansion valve 212 is reduced, or the current expansion valve opening degree is kept unchanged.

If the temperature of all the batteries is not higher than 45 ℃, judging whether the temperature in the carriage reaches the set temperature of the air conditioner, if so, reducing the opening degree of the second expansion valve 33, increasing the opening degree of the first expansion valve 212 and adjusting the refrigerant flow of the in-vehicle cooling branch and the battery cooling branch by the vehicle-mounted air conditioner controller. If the temperature in the carriage does not reach the set temperature of the air conditioner, the requirement of the refrigerating capacity in the vehicle is met preferentially. In the battery cooling process, if the vehicle-mounted air conditioner receives the battery cooling completion information sent by the battery manager, the battery cooling completion information is forwarded to the battery thermal management controller, and the battery cooling is completed.

The average temperature of the battery is subjected to hierarchical treatment, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the temperature of any battery is higher than 40 ℃, the battery cooling function of the corresponding battery is started, when the temperature of all batteries reaches 35 ℃, the battery cooling is finished, and when the temperature of any battery reaches 45 ℃ higher temperature, the cooling capacity requirement of the battery cooling is preferentially met. In addition, when the sum of the actual power for temperature regulation of the battery is smaller than the sum of the power required for temperature regulation of the battery, if the average temperature of the battery does not exceed 45 ℃, the demand for cooling capacity in the vehicle cabin is still prioritized, and if the cooling power in the vehicle cabin is sufficient and reaches equilibrium, the cooling power of the battery is increased.

In the starting process of the battery cooling function, if the air conditioner needs to be started in the compartment, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the compartment keeps balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 2, when the on-board air conditioning controller detects that the air temperatures in the vicinity of the first air outlet 100 and the second air outlet 200 are higher than the air temperatures in the vicinity of the third air outlet 300 and the fourth air outlet 400 by more than 3 ℃, the on-board air conditioning controller controls the opening degree of the first expansion valve 212 in the first battery cooling branch 201 to decrease, the opening degree of the second expansion valve 33 in the first in-vehicle cooling branch 301 to increase, so that the cooling power of the first in-vehicle cooling branch 301 increases, the on-board air conditioning controller controls the opening degree of the second expansion valve 33 in the second in-vehicle cooling branch 302 to decrease, the opening degree of the first expansion valve 212 in the second battery cooling branch 202 to increase, so that the cooling power of the second in-vehicle cooling branch 302 decreases, the cooling power of the battery cooling branches is generally maintained, and the air temperatures in the vicinity.

When the on-board air conditioning controller detects that the air temperatures in the vicinity of the third outlet 300 and the fourth outlet 400 are higher than the air temperatures in the vicinity of the first outlet 100 and the second outlet 200 by more than 3 ℃, the on-board air conditioning controller controls the opening degree of the first expansion valve 212 in the second battery cooling branch 202 to decrease, the opening degree of the second expansion valve 33 in the second in-vehicle cooling branch 302 to increase, so that the cooling capacity of the second in-vehicle cooling branch 302 increases, and the on-board air conditioning controller controls the opening degree of the second expansion valve 33 in the first in-vehicle cooling branch 301 to decrease, the opening degree of the first expansion valve 212 in the first battery cooling branch 201 to increase, so that the cooling capacity of the first in-vehicle cooling branch 301 decreases. When the on-board air conditioning controller detects that the difference between the air temperatures in the areas near the first outlet 100 and the second outlet 200 and the air temperatures in the areas near the third outlet 300 and the fourth outlet 400 is within 3 ℃, the opening degrees of the second expansion valves 33 in the first in-vehicle cooling branch 301 and the second in-vehicle cooling branch 302 are kept unchanged.

In summary, as shown in fig. 3a to 3b, when the thermostat system enters the cooling mode, the thermostat demand power P1 of each battery, the thermostat actual power P2 of each battery, and the maximum refrigerating power P of the single compressor are respectively obtained, and the total thermostat demand power P of the entire thermostat system can be calculated by adding the P1 of each battery_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 12.

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 turned on, assuming that the temperatures of the areas of the first outlet 100 and the second outlet 200 are T51 and the temperatures of the areas of the third outlet 300 and the fourth outlet 400 are T52, the following determinations are made:

if T51-T52 is more than or equal to Tc, and the Tc is 3 ℃, the following treatment is carried out:

if the 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 the expansion valve of the first battery cooling branch 201 is controlled to be decreased, the opening degree of the expansion valve of the in-vehicle cooling branch is controlled to be increased, or the expansion valve of the second battery cooling branch 202 is controlled to be increased, and the opening degree of the expansion valve of the in-vehicle cooling branch is controlled to be decreased, so that the temperature of T51 is increased and decreased, the cooling power requirement of the battery is met, and the ambient temperature in the vehicle is balanced.

If Pz + P4 is greater than P5, the first compressor 11 and the second compressor 12 are controlled to operate at the maximum cooling power, and at the same time, the opening degree of the expansion valve of the first battery cooling branch 201 is controlled to decrease, the opening degree of the expansion valve of the in-vehicle cooling branch is controlled to increase, or at the same time, the expansion valve of the second battery cooling branch 202 is controlled to increase, and the opening degree of the expansion valve of the in-vehicle cooling branch is controlled to decrease, so that the temperature of T51 is decreased rapidly, and at the same time, the cooling power requirement of the battery is met, and the ambient.

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 first battery cooling branch 201 is controlled and the opening degree of the expansion valve of the in-vehicle cooling branch is controlled to be increased, so that all the cooling power of the first compressor 11 is used for in-vehicle cooling. Meanwhile, the expansion valve of the battery cooling circuit in the second battery cooling branch 202 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 invention, the battery manager obtains the temperatures of the two batteries, and determines whether the temperature difference between the two batteries is greater than the preset temperature threshold, so that the semiconductor heat exchange module balances the temperatures of the two batteries when the temperature difference between the two batteries is greater than the preset temperature threshold. Therefore, the system can balance the temperatures of the batteries through the semiconductor heat exchange module when the temperature difference between the batteries is large, and the cycle life of the batteries can be prolonged. And the temperature of the battery can be adjusted according to the actual temperature of the vehicle-mounted battery 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 in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced due to too high or too low temperature is avoided.

Fig. 6 is a flowchart of a temperature adjustment method of an in-vehicle battery according to an embodiment of the present invention. As shown in fig. 1a-1b, the vehicle-mounted air conditioning module includes a first refrigeration branch, a second refrigeration branch, a first battery cooling branch and a second battery cooling branch, where the first refrigeration branch includes a first compressor, the second refrigeration branch includes a second compressor, the first battery cooling branch includes a first heat exchanger, and the second battery cooling branch includes a second heat exchanger, where the first compressor is connected with the first heat exchanger and the second heat exchanger through a first flow rate adjusting member to form a loop, and the second compressor is connected with the first heat exchanger and the second heat exchanger through a second flow rate adjusting member to form a loop; the battery heat management module comprises a first battery heat management module and a second battery heat management module; the semiconductor heat exchange module comprises a first end and a second end, wherein the heat exchange branch of the first battery and the first battery heat management module can be selectively communicated with at least one of the first heat exchanger and the first end of the semiconductor heat exchange module to form a heat exchange flow path; the heat exchange branch of the second battery and the second battery heat management module can be selectively communicated with at least one of the second heat exchanger and the second end of the semiconductor heat exchange module to form a heat exchange flow path. As shown in fig. 6, the temperature adjusting method includes the steps of:

and S1, acquiring the temperatures of the two batteries.

And S2, judging whether the temperature difference between the two batteries is larger than a preset temperature threshold value. The preset temperature threshold may be preset according to actual conditions, and may be 8 ℃.

And S3, if the temperature difference is larger than the preset temperature threshold value, equalizing the temperatures of the two batteries.

Further, according to an embodiment of the present invention, as shown in fig. 1a to 1b, a first end of the first battery thermal management module is connected to a first end of the first heat exchanger and a first end of the heating end of the semiconductor heat exchange module through a first three-way valve, a second end of the first battery thermal management module is connected to a second end of the first heat exchanger and a second end of the heating end of the semiconductor heat exchange module through a second three-way valve, a first end of the second battery thermal management module is connected to a first end of the second heat exchanger and a first end of the cooling end of the semiconductor heat exchange module through a third three-way valve, and a second end of the second battery thermal management module is connected to a second end of the second heat exchanger and a second end of the cooling end of the semiconductor heat exchange module through a fourth three-way valve. Wherein, equalizing the temperatures of the two batteries specifically includes:

controlling the power supply direction of the semiconductor heat exchange module to connect the battery with low temperature with the heating end in the semiconductor heat exchange module and to connect the battery with high temperature with the cooling end in the semiconductor heat exchange module; generating balanced required power according to the temperature difference between the two batteries and the target time; and balancing the temperatures of the two batteries according to the balance required power control. The target time t may be preset according to actual conditions, and may be 1 hour, for example.

Specifically, the heating power/cooling power required for equalizing the required power, i.e., adjusting the temperature difference between the two batteries to within a predetermined range, for example, within 3 ℃. The semiconductor heat exchange module is provided with a heating end and a cooling end, and the heating end and the cooling end are exchanged when the power supply is reversely connected. Fig. 1a is a schematic diagram of a semiconductor heat exchange module forward power supply temperature regulation system, and fig. 1b is a schematic diagram of a semiconductor heat exchange module reverse power supply temperature regulation system.

When a large temperature difference exists between the two batteries, for example, the temperature difference exceeds 8 ℃, then the battery temperature equalization operation mode is entered. The cooling end of the semiconductor heat exchange module is connected into the heat exchange flow path of the battery with higher temperature, the heating end is connected into the heat exchange flow path of the battery with lower temperature, the battery with higher temperature is cooled, the battery with lower temperature is heated, heat exchange is carried out between the battery with higher temperature and the battery with lower temperature, and the semiconductor heat exchange module improves the heat exchange rate between the batteries. For example, FIG. 1a shows a first cell with a lower temperature and a second cell with a higher temperature; fig. 1b shows that the temperature of the first cell is higher and the temperature of the second cell is lower. The semiconductor heat exchange module can complete the temperature balance of the battery by changing the power supply direction. The battery cooling liquid directly flows into the semiconductor heat exchange module, and the heat exchange efficiency of the battery can also be improved. In the process of heating/cooling the battery, the semiconductor heat exchange module adjusts the heating power/cooling power according to the balance required power in real time so as to complete the temperature balance of the battery within the target time.

The equilibrium required power P3 includes a heating required power P3a and a cooling required power P3b, and when the mass, the internal resistance and the current are the same between the two batteries, when the batteries are cooled, the balance required power P3 can be calculated according to the following formula:

and generates the heating demand power P3 a. Wherein, Delta T₁Is the temperature difference between two batteries, t is the target time, C is the specific heat capacity of the battery, M is the mass of the battery, I is the current of the battery, and R is the internal resistance of the battery.

When the mass, the current, and the internal resistances of the two batteries are not equal, taking as an example that the first battery temperature is lower, the second battery temperature is higher, the first battery needs to be heated, and the second battery needs to be cooled, the heating required power P3a may be calculated according to the following formula (1) and the cooling required power P3b may be calculated according to the following formula (2):

（1）

（2）

wherein, Delta T₁Is the temperature difference between two batteries, t is the target time, C is the specific heat capacity of the battery, M₁Mass of the first cell, M₂Is the mass of the second cell, I₁Is the current of the first cell, I₂Is the current of the second cell, R₁Is the internal resistance of the first cell, R₂The temperature change of the first battery 41 is the internal resistance of the second batteryIs composed of

The temperature change of the second battery 42 is:

。

if the temperature of the first battery is higher than that of the second battery, the first battery needs to be cooled and the second battery needs to be heated, the difference of the heating power caused by the difference of the current between the two batteries is as follows

The heating required power P3a and the cooling required power P3b may be calculated according to the following formula (3) and formula (4):

（3）

（4）

i.e. P3a = P3b

Wherein, Delta T₁Is the temperature difference between two batteries, t is the target time, C is the specific heat capacity of the battery, M₁Mass of the first cell, M₂Is the mass of the second cell, I₁Is the current of the first cell, I₂Is the current of the second battery and is,r1 is the internal resistance of the first battery, R₂Is the internal resistance of the second battery.

And after entering a battery temperature balancing working mode, controlling the semiconductor heat exchange module to perform temperature balancing regulation according to the larger value of the heating required power P3a and the cooling required power P3 b. For example, P3a is more than or equal to P3b, the semiconductor heat exchange module is controlled to operate according to the heating required power P3 a; if P3a < P3b, the semiconductor heat exchange module 2 operates according to the cooling demand power P3 b. Or the semiconductor heat exchange module adjusts the working power, if P3a is more than or equal to P3b, the semiconductor heat exchange module can operate according to the power which is more than the heating required power P3 a; if P3a < P3b, the semiconductor heat exchange module operates according to the power P3b which is larger than the cooling demand. Meanwhile, in the process of battery temperature equalization, the heating power of the heating end of the semiconductor heat exchange module is ensured to be more than or equal to P3a, and the cooling power of the cooling end is ensured to be more than or equal to P3b, so that the heating end and the cooling end both meet the requirement of temperature equalization power.

It can be understood that, in the invention, when the power of the semiconductor heat exchange module is increased, the cooling power of the cooling end and the heating power of the heating end can be simultaneously increased.

According to an embodiment of the present invention, as shown in fig. 7, the temperature adjustment method of the vehicle-mounted battery may further include:

and S10, acquiring the temperatures of the two batteries.

S20, it is determined whether the temperature of a certain battery is greater than the first temperature threshold.

And S30, if the temperature of any battery is larger than the first temperature threshold value, controlling the vehicle-mounted air conditioner to work and entering a cooling mode.

S40, if the temperatures of all the batteries are less than or equal to the first preset threshold, further determining whether the temperature of a certain battery is less than the second temperature threshold.

And S50, if the temperature of any battery is less than the second temperature threshold value, controlling the heater to work and entering a heating mode. Wherein the first temperature threshold is greater than the second temperature threshold, for example, the first temperature threshold may be 40 ℃ and the second temperature threshold may be 0 ℃.

S60, if the temperatures of all the batteries are greater than or equal to the second temperature threshold and less than or equal to the first temperature threshold, it is determined whether the temperature difference between the two batteries is greater than a preset temperature threshold.

And S70, if the temperature difference between the two batteries is larger than a preset temperature threshold value, entering a temperature equalization mode.

Specifically, when the temperature of a certain battery is high, for example, higher than 40 ℃, the temperature regulation system of the vehicle-mounted battery enters a cooling mode, and the vehicle-mounted air conditioner and the battery thermal management module start to work. The corresponding electronic opening is controlled, for example the temperature of the first battery is higher than 40 ℃, then the first electronic valve of the first battery cooling branch is controlled to open. When the temperature of a certain battery is lower, the temperature regulating system of the vehicle-mounted battery enters a heating mode, the battery thermal management module starts to work, and the heater is started to heat the medium in the heat exchange flow path.

Further, according to an embodiment of the present invention, as shown in fig. 1a to 1b, each of the battery thermal management modules includes a pump, a first temperature sensor, a second temperature sensor, a flow rate sensor, a medium container, and a heater provided on a heat exchange flow path; wherein: the pump is used for enabling the medium in the heat exchange flow path to flow; the first temperature sensor is used for detecting the inlet temperature of a medium flowing into the vehicle-mounted battery; the second temperature sensor is used for detecting the outlet temperature of the medium flowing out of the vehicle-mounted battery; the flow velocity sensor is used for detecting the flow velocity of the medium in the heat exchange flow path. The medium container is used for storing and providing the medium for the heat exchange flow path. The heater is used for heating the medium in the cooling pipeline to provide heating power, and the temperature of the battery is adjusted when the temperature of the battery is low. The above method may further include: acquiring the temperature regulation actual power P2 and the temperature regulation required power P1 of the battery, and regulating the temperature of the battery according to the temperature regulation actual power P2 and the temperature regulation required power P1.

Specifically, during the process of cooling the battery, the temperature regulation required power P1 and the temperature regulation actual power P2 of the battery are also obtained in real time, wherein the temperature regulation required power P1 is the power required to be supplied to the battery for regulating the temperature of the battery to the set target temperature within the target time, and the battery temperature regulation actual power P2 is the actual power, the target temperature and the target time obtained by the battery when the battery is currently subjected to temperature regulation, and can be preset according to the actual condition of the vehicle-mounted battery, for example, when the battery is cooled, the target temperature can be set to about 35 ℃, and the target time can be set to 1 hour. The refrigerating power can be adjusted according to the temperature adjustment required power P1 and the temperature adjustment actual power P2 of the battery, so that the temperature of the battery can be adjusted within the target time, the temperature of the vehicle-mounted battery is maintained within a preset range, and the situation that the performance of the vehicle-mounted battery is influenced due to overhigh or overlow temperature is avoided.

As shown in fig. 1a-1b, the first flow regulating member may include a first regulating valve and a second regulating valve, and the second flow regulating member may include a third regulating valve and a fourth regulating valve. Namely, the first battery cooling branch can also comprise a first regulating valve and a third regulating valve; the second battery cooling branch 202 may further include a second regulating valve and a fourth regulating valve, and the connection manner of the regulating valves may specifically refer to fig. 1a-1b, which is not described herein again. As shown in fig. 1a-1b, the cooling capacity of each compressor can be distributed to the first battery cooling branch or the second battery cooling branch by adjusting the first to fourth adjusting valves. For example, the compressor of the first refrigeration branch may distribute the cooling medium to the first battery cooling branch through the first regulating valve, and distribute the cooling medium to the second battery cooling branch through the second regulating valve. The compressor in the second refrigeration branch can distribute the refrigerant to the first battery cooling branch through the third regulating valve 3, and distribute the refrigerant to the second battery cooling branch 202 through the fourth regulating valve.

The opening degree of the first regulating valve, the second regulating valve and the third regulating valve can be adjusted, and the flow of the cooling liquid of the two cooling branch loops of the first battery and the second battery can be controlled simultaneously, so that the temperatures of the two batteries are equalized.

When the temperature adjusting system is operated in the cooling mode, as shown in fig. 1a-1b, the temperature adjustment required powers P1 of the first battery and the second battery may be calculated, respectively, and then the opening degree of the corresponding second expansion valve may be adjusted according to the P1 of each battery and the maximum cooling power P of the compressor, respectively. During the cooling process, the controller also adjusts the actual power P2 according to the temperature of each battery respectively to continuously adjust the opening degree of the second expansion valve. Meanwhile, the controller adjusts the flow distribution of the cooling liquid of the first battery cooling branch and the second battery cooling branch by adjusting the opening degrees of the first adjusting valve, the fourth adjusting valve and the third adjusting valve according to the temperature condition between the first battery and the second battery, and therefore the balance of the temperature of the first battery and the temperature of the second battery is controlled. When the temperature of the first battery 41 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 temperature adjusting system works 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.

How to obtain the temperature-regulation required power P1 and the temperature-regulation actual power P2 of the battery is described below with reference to specific embodiments.

According to an embodiment of the present invention, obtaining the temperature regulation required power P1 of the battery specifically includes: the method comprises the steps of obtaining a first parameter when the starting temperature of each battery is adjusted, and generating first temperature adjustment required power of each battery according to the first parameter. And acquiring a second parameter of each battery during temperature adjustment, and generating a second temperature adjustment required power of each battery according to each second parameter. The temperature-regulation required power P1 for each battery is generated based on the first temperature-regulation required power for each battery and each second temperature-regulation required power for the battery.

Still 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,generating a first temperature regulation demand power of the battery according to the first parameter 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.

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 one embodiment of the invention, the second parameter is an average current I of the battery cell in a preset time, and the second temperature regulation required power of the 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. The current of each battery can be detected by a current hall sensor to obtain the average current I of the battery over a period of time.

Wherein the temperature regulation required power of each battery is equal to Δ T when the batteries are cooled₁*C*M/t+I²R; the power demand for temperature regulation of each battery is equal to Δ T when the batteries are heated₁*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 temperature of each cell are acquired, and the flow velocity v of the coolant flowing into the flow path is acquired, respectively. Generating a second temperature difference Δ T according to an inlet temperature and an outlet temperature of a flow path of the battery, respectively₂. According to the second temperature difference Delta 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-regulated actual power 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-sectional area of the flow path in unit time, wherein m = 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.

Specifically, the coolant flows into the interior of the battery from the inlet of the flow path and flows out from the outlet of the flow path, thereby achieving heat exchange between the battery and the coolant. Detecting the temperature of the cooling liquid at the inlet of the flow path, the temperature of the cooling liquid at the outlet of the flow path and the flow speed information of the cooling liquid in the pipeline according to the formula delta T₂C m, the temperature regulation actual power of each battery can be calculated. According to a first temperature difference Delta T between an initial temperature and a target temperature of a battery₁A target time T for cooling the battery, a specific heat capacity C of the battery, a mass M of the battery, an average current I of the battery, an internal resistance R of the battery according to a formula delta T₁*C*M/t+I²R or Delta T₁*C*M/t-I²R, the required power for temperature regulation of each cell can be calculated.

How to adjust the temperature of the battery according to the temperature-adjusted actual power P2 and the temperature-adjusted required power P1 of the battery will be described below with reference to specific embodiments.

The method for adjusting the temperature of the battery according to the actual temperature adjustment power P2 and the required temperature adjustment power P1 of the battery specifically comprises the following steps: judging whether the temperature regulation required power P1 of each battery is greater than the temperature regulation actual power P2; when in the cooling mode, if the temperature-regulation required power P1 of a certain battery is greater than the temperature-regulation actual power P2, the power of the compressor is increased. When in the heating mode, if the temperature regulation required power P1 of a certain battery is greater than the temperature regulation actual power P2, the heating power of the heater is increased.

That is, in cooling the batteries, if the temperature-adjustment actual power P2 of any one of the batteries is less than the battery temperature-adjustment required power P1, the cooling power of the corresponding compressor may be increased while increasing the opening degree of the expansion valve to increase the opening degree of the battery cooling branch, thereby increasing the temperature-adjustment actual power P2 so that the batteries can complete temperature adjustment within the target time. When the battery is heated, if the temperature adjustment actual power P2 of any one battery is less than the battery temperature adjustment required power P1, the heating power of the corresponding heater may be increased, thereby increasing the temperature adjustment actual power P2 so that the battery may complete the temperature adjustment within the target time.

According to an embodiment of the present invention, the temperature adjustment method may further include: when the cooling mode is adopted and the temperature of the first battery is higher than that of the second battery, the opening degree of the first battery cooling branch is increased and the opening degree of the second battery cooling branch is decreased; when the cooling mode is adopted and the temperature of the second battery is higher than that of the first battery, the opening degree of the second battery cooling branch is increased and the opening degree of the first battery cooling branch is reduced.

Specifically, if the temperature of one battery is higher than 40 ℃, the cooling function of the battery thermal management system is started, and the battery manager sends the starting information of the cooling function of the battery to the vehicle-mounted air conditioner. The battery manager collects current battery temperature and current parameters, estimates heating parameters of the battery according to average current in a period of time, estimates temperature regulation required power P1 of the battery according to the difference between the current average temperature of the battery pack and the target temperature of the battery and the average current of the battery, and sends the battery cooling required power to the vehicle-mounted air conditioner controller. While the battery manager sends the number of the battery that needs to be cooled.

If the battery manager detects that the temperature of the first battery is lower than 35 ℃, the battery manager transmits a first battery cooling completion message. If the battery manager detects that the temperature of the second battery is lower than 35 ℃, the battery manager transmits cooling completion information of the second battery. And if the temperature of the first battery is detected to be higher than that of the second battery by more than 3 ℃, the battery manager sends message information for increasing the cooling power of the first battery. And if the temperature of the second battery is higher than that of the first battery by more than 3 ℃, the battery manager sends message information for increasing the battery cooling power of the second battery.

And if the battery manager detects that the temperatures of the batteries are lower than 35 ℃, the batteries are cooled completely, and the battery manager sends battery cooling completion information to the vehicle-mounted air conditioner. If the temperature of the battery remains above 35 ℃ after the cooling function has been turned on for 1 hour, the battery manager increases the battery cooling power requirement.

If the temperature of one battery is lower than 0 ℃, the heating function of the temperature regulating system is started. The battery manager collects current battery temperature and current parameters, estimates heating parameters of the battery according to average current within a period of time, estimates temperature regulation required power P1 of the power battery according to a difference value between actual temperature of the battery and target temperature of the battery and the average current of the battery, and sends the temperature regulation required power P1 to the battery thermal management controller so as to control a heater to perform heating work according to the temperature regulation required power P1.

If the battery manager detects that the temperature of the first battery is higher than 10 ℃, the battery manager transmits first battery heating completion information. If the battery manager detects that the temperature of the second battery is higher than 10 ℃, the battery manager transmits second battery heating completion information. And if the temperature of the first battery is detected to be lower than the temperature of the second battery by more than 3 ℃, the battery manager sends message information for increasing the battery heating power of the first battery. And if the temperature of the second battery is detected to be lower than the electric temperature of the first battery by more than 3 ℃, the battery manager sends message information for increasing the heating power of the second battery.

And if the battery manager detects that the temperatures of the batteries are all higher than 10 ℃, the batteries are heated completely, and the battery manager sends battery heating completion information to the battery management controller. If the temperature of the battery is still below 10 ℃ after the heating function is turned on for 2 hours, the battery manager increases the heating power of the heater.

And if the temperature of the battery is between 0 ℃ and 40 ℃ and the difference between the temperatures of the first battery and the second battery exceeds 8 ℃, the battery manager sends battery temperature equalization function starting information. The battery manager collects the temperature difference and the target equalization time between the current batteries, estimates the temperature equalization power required by the battery pack, and sends the battery temperature equalization power demand information, so that the semiconductor heat exchange module performs temperature equalization on the batteries according to the battery temperature equalization power demand information. In the starting process of the battery temperature balancing function, if the battery manager detects that the starting condition of the battery heating function is met, the battery manager exits the temperature balancing function and enters the battery heating function. And if the battery manager detects that the starting condition of the battery cooling function is met, the battery manager exits the temperature balancing function and enters the battery cooling function. And if the difference between the average temperatures of the first battery and the second battery is less than 3 ℃, the battery manager sends battery temperature balancing function completion information.

After the vehicle-mounted air conditioner is powered on, if the vehicle-mounted air conditioner controller receives battery cooling function starting information, the battery cooling function is started, and the vehicle-mounted air conditioner controller sends the battery cooling function starting information to the battery thermal management controller. The vehicle-mounted air conditioner controller receives the temperature regulation required power P1 of the battery sent by the battery manager and forwards the information to the battery thermal management controller. During the cooling of the battery, the on-board air conditioning controller controls the first electronic valve and the first expansion valve to open. The vehicle-mounted air conditioner receives the water temperature information sent by the battery thermal management controller and the actual temperature regulation power P2 of the battery and forwards the information to the battery manager. In the process of cooling the batteries, the vehicle-mounted air conditioner controller compares the temperature regulation required power P1 and the temperature regulation actual power P2 of the batteries, and if the temperature regulation actual power P2 of the battery of a certain battery is smaller than the temperature regulation required power P1, the vehicle-mounted air conditioner controller controls the refrigeration power of a corresponding compressor to be increased. If it is detected that the temperature of the first battery is higher than the temperature of the second battery by more than 3 deg.C, the opening degree of the first expansion valve of the first battery cooling branch is increased and the opening degree of the first expansion valve of the second battery cooling branch is decreased, so that the cooling power of the first battery is increased and the cooling power of the second battery is decreased, thereby reducing the battery temperature difference between the batteries. If the temperature of the second battery is higher than the temperature of the first battery by more than 3 deg.C, the opening degree of the first expansion valve of the cooling branch of the second battery is increased by a second degree and the opening degree of the first expansion valve of the cooling branch of the first battery is decreased, so that the cooling power of the first battery is decreased and the cooling power of the second battery is increased, thereby reducing the battery temperature difference between the batteries.

In the battery cooling process, if the vehicle-mounted air conditioner controller receives the first battery cooling completion information, the first electronic valve of the first battery cooling branch is controlled to be closed. And if the vehicle-mounted air conditioner controller receives the second battery cooling completion information sent by the battery manager, controlling a first electronic valve of a second battery cooling branch to be closed. And if the vehicle-mounted air conditioner controller receives the battery cooling completion information sent by the battery manager, the battery cooling completion information is forwarded to the battery thermal management controller, and the battery cooling is completed.

According to one embodiment of the invention, when the cooling mode is adopted, and the temperature of the first battery is higher than that of the second battery, the power supply direction of the semiconductor heat exchange module and the opening/closing of the channels of the first to fourth three-way valves are controlled to enable the cooling end of the semiconductor heat exchange module to be connected with the first heat exchanger; and when the temperature of the second battery is higher than that of the first battery in the cooling mode, controlling the power supply direction of the semiconductor heat exchange module and opening/closing of the channels of the first to fourth three-way valves to enable the cooling end of the semiconductor heat exchange module to be connected with the second heat exchanger.

Specifically, as shown in fig. 1a-1b, during the starting process of the battery cooling function, if the temperature of the first battery is higher than that of the second battery by more than 3 ℃, the semiconductor heat exchange module supplies power reversely, and controls the opening of the

channels

1 and 2 of the first three-way valve and the second three-way valve, and controls the opening of the

channels

1 and 2 of the third three-way valve and the fourth three-way valve, so that the cooling end is connected to the circulation loop of the first battery, and the heating end is connected to the circulation loop of the second battery. If the temperature of the second battery is higher than that of the first battery by more than 3 ℃, the semiconductor heat exchange module supplies power in the forward direction, and controls the opening of the channel 1 and the opening of the channel 2 of the first three-way valve and the second three-way valve and the opening of the channel 1 and the channel 2 of the third three-way valve and the fourth three-way valve, so that the cooling end is connected to the circulation loop of the second battery, and the heating end is connected to the circulation loop of the second battery. If the temperature of one battery is lower than 0 ℃, the heating function of the temperature regulating system is started. When the battery is heated, the heating power can be provided by the semiconductor heat exchange module in addition to the heater.

According to one embodiment of the invention, when the temperature of the first battery is lower than that of the second battery in the heating mode, the power supply direction of the semiconductor heat exchange module and the opening/closing of the channels of the first to fourth three-way valves are controlled so that the heating end of the semiconductor heat exchange module is connected with the first heat exchanger and the cooling end of the semiconductor heat exchange module is connected with the second heat exchanger. In the heating mode, when the temperature of the second battery is lower than that of the first battery, the power supply direction of the semiconductor heat exchange module and the opening/closing of the passages of the first to fourth three-way valves are controlled so that the heating end of the semiconductor heat exchange module and the cooling end of the semiconductor heat exchange module connected with the second heat exchanger are connected with the first heat exchanger 21.

Specifically, as shown in fig. 1a-1b, in the process of starting the battery heating function, if the temperature of the first battery is lower than that of the second battery by more than 3 ℃, the semiconductor heat exchange module supplies power in the forward direction, the channels 1 of the first three-way valve and the second three-way valve are opened, the channel 2 is closed, the channels 1 of the third three-way valve and the fourth three-way valve are opened, the channel 2 is closed, so that the heating end of the semiconductor heat exchanger is connected to the circulation loop of the first battery, and the cooling end of the semiconductor heat exchange module is connected to the circulation loop of the second battery 42. If the temperature of the second battery is lower than that of the first battery by more than 3 ℃, the semiconductor heat exchange module reversely supplies power, the channels 1 of the first three-way valve and the second three-way valve are opened, the channels 2 of the third three-way valve and the fourth three-way valve are closed, the heating end of the semiconductor heat exchanger is connected to the circulation loop of the second battery by opening the channels 1 of the third three-way valve and the fourth three-way valve, and the cooling end of the semiconductor heat exchange module is connected to the circulation loop of the first battery. And if the semiconductor heat management module does not receive the information, cutting off the power supply of the semiconductor heat exchange module. In the heating process, if the temperature regulation required power P1 of the battery is greater than the temperature regulation actual power P2, the heating power of the semiconductor heat exchange module is increased.

It will be appreciated that the heater is switched off when the cooling function is activated. When the heating function is started, the heater is opened, and the first regulating valve and the second regulating valve are closed.

When the battery temperature adjusting system is as shown in fig. 3a-3b, when the battery is cooled and the temperature of the first battery is higher than that of the second battery, the power supply of the semiconductor heat exchange module is changed, the first to fourth three-way valves are controlled to connect the cooling end of the semiconductor heat exchange module with the first heat exchanger, and the fourth fan is controlled to work at the same time, as shown in fig. 3 b; when the battery is cooled and the temperature of the second battery is higher than that of the first battery, the power supply of the semiconductor heat exchange module is changed, the first to fourth three-way valves are controlled to connect the cooling end of the semiconductor heat exchange module with the second heat exchanger, and the third fan is controlled to work, as shown in fig. 3 a.

The main difference between fig. 1a-1b and fig. 3a-3b is that a heat exchange fan is added in fig. 3a-3b, and in the scheme in fig. 1a-1b, two batteries need to be simultaneously connected into a circulation loop at one end of a semiconductor heat exchange module to realize temperature equalization, that is, one battery needs to be heated, the other battery needs to be cooled simultaneously, and fig. 1a-1b can quickly realize temperature equalization between the batteries. And 3a-3b, only one of the batteries can be controlled to be connected into the temperature equalization loop, and the other end of the battery is subjected to heat exchange with the external environment through the fan, that is, if the temperature of the first battery is higher, the first battery can be connected into the cooling end alone, and the second battery does not need to be connected into the heating loop, so that the second battery can be cooled more quickly by the scheme of 3a-3 b.

Specifically, as shown in fig. 3a-3b, in the process of starting the battery cooling function, if the temperature of the first battery is higher than that of the second battery by more than 3 ℃, the semiconductor heat exchange module is controlled to supply power reversely, the

channels

1 and 2 of the first three-way valve and the second three-way valve are controlled to be opened, the channels 1 of the third three-way valve and the fourth three-way valve are controlled to be closed, the channels 2 are controlled to be opened, so that the cooling end is connected to the circulation loop of the first battery, and the fourth fan is controlled to start to work. If the temperature of the second battery is higher than that of the first battery by more than 3 ℃, controlling the semiconductor heat exchange module to supply power in the forward direction, closing the channel 1 and opening the channel 2 of the first three-way valve and the second three-way valve 72, and controlling the channel 1 and the channel 2 of the third three-way valve 73 and the fourth three-way valve to open, so that the cooling end is connected to the circulation loop of the second battery, and simultaneously controlling the third fan to start working. And if the semiconductor heat management module does not receive the information, the power supply of the semiconductor heat exchange module is cut off.

Specifically, as shown in fig. 3a-3b, in the process of starting the battery heating function, if the temperature of the first battery is lower than that of the second battery by more than 3 ℃, the semiconductor heat exchange module is controlled to supply power in the forward direction, the channels 1 of the first three-way valve and the second three-way valve are controlled to be opened, the channel 2 is controlled to be closed, the channels 1 of the third three-way valve and the fourth three-way valve are controlled to be closed, the channel 2 is controlled to be closed, so that the heating end is connected to the circulation loop of the first battery, and the fourth fan is controlled to start to work. If the temperature of the second battery is lower than that of the first battery by more than 3 ℃, as shown in fig. 3b, the semiconductor heat exchange module 3 is controlled to supply power reversely, the

channels

1 and 2 of the first three-way valve and the second three-way valve are closed, the

channels

1 and 2 of the third three-way valve and the fourth three-way valve are controlled to be opened, the channel 2 is closed, the heating end is connected to the circulation loop of the second battery, and the third fan is controlled to start working. And if the semiconductor heat management module does not receive the information, the power supply of the semiconductor heat exchange module is cut off.

According to an embodiment of the present invention, as shown in fig. 4a-4b, the temperature adjustment system for the on-board battery further includes in-vehicle cooling branches, each in-vehicle cooling branch includes an evaporator, and the two evaporators are respectively connected in parallel with the two heat exchangers and then respectively connected in series with the plurality of compressors. The in-vehicle cooling branch comprises a first in-vehicle cooling branch and a second in-vehicle cooling branch, and the method further comprises the following steps: judging whether the temperature of the battery reaches a third preset temperature or not; if the temperature reaches the third preset temperature, reducing the opening degrees of the first in-vehicle cooling branch and the second in-vehicle cooling branch, and increasing the opening degrees of the first battery cooling branch and the second battery cooling branch at the same time; if the temperature does not reach the third preset temperature, further judging whether the temperature in the carriage reaches the set temperature of the air conditioner; and if the set temperature of the air conditioner is reached, reducing the opening degrees of the first vehicle internal cooling branch and the second vehicle internal cooling branch, and increasing the opening degrees of the first battery cooling branch and the second battery cooling branch. The third preset temperature may be preset according to actual conditions, and may be, for example, 45 ℃.

Specifically, as shown in fig. 5, the first in-vehicle cooling branch corresponds to a first air outlet and a second air outlet in the vehicle compartment, and the second in-vehicle cooling branch corresponds to a third air outlet and a fourth air outlet in the vehicle compartment, where the method may further include: when the temperatures of the first air outlet and the second air outlet are higher than the temperatures of the third air outlet and the fourth air outlet, the opening degree of the first in-vehicle cooling branch is increased, and the opening degree of the second in-vehicle cooling branch is reduced; when the temperatures of the first air outlet and the second air outlet are lower than the temperatures of the third air outlet and the fourth air outlet, the opening degree of the second in-vehicle cooling branch is increased, and the opening degree of the first in-vehicle cooling branch is reduced.

Specifically, as shown in fig. 4a-4b, each in-vehicle cooling branch includes: the evaporator, the second electronic valve and the second expansion valve are connected in series, and the in-vehicle cooling branch is connected with the corresponding refrigeration branch. The second electronic valve is used for controlling the opening and closing of the corresponding in-vehicle cooling branch, and the second expansion valve is used for controlling the opening of the corresponding in-vehicle cooling branch. When the interior of the carriage needs cooling, the second electronic valve is controlled to be opened.

In the cooling process of the battery, if the actual temperature regulation power P2 of the battery is less than the required temperature regulation power P1 of the battery, whether the temperature of the battery reaches 45 ℃ (higher temperature) is judged, if the temperature of the battery reaches 45 ℃, the opening degree of the second expansion valve is reduced, the opening degree of the first expansion valve is increased, the refrigerant flow of the cooling branch in the vehicle is reduced, the refrigerant flow of the cooling branch in the battery is increased, and the refrigerating capacity distribution of the cooling of the battery and the cooling in the vehicle is adjusted. And comparing the actual power of temperature regulation of the first cooling branch and the second cooling branch in real time, if the sum of the actual power of temperature regulation of the two cooling branches is less than the sum of the power of temperature regulation requirements of the two batteries, reducing the opening degree of the second expansion valve, increasing the opening degree of the first expansion valve, and if the sum of the actual power of temperature regulation of the two cooling branch circuits is equal to the sum of the power of temperature regulation requirements of the two batteries, keeping the opening degree of the current expansion valve unchanged.

And if the temperature of all the batteries is not higher than 45 ℃, judging whether the temperature in the carriage reaches the set temperature of the air conditioner, if so, reducing the opening degree of the second expansion valve, increasing the opening degree of the first expansion valve, and adjusting the refrigerant flow of the in-vehicle cooling branch and the battery cooling branch. If the temperature in the carriage does not reach the set temperature of the air conditioner, the requirement of the refrigerating capacity in the vehicle is met preferentially. In the battery cooling process, if the vehicle-mounted air conditioner receives the battery cooling completion information sent by the battery manager, the battery cooling completion information is forwarded to the battery thermal management controller, and the battery cooling is completed.

The average temperature of the battery is subjected to hierarchical treatment, and the threshold values of temperature control are 40 ℃, 45 ℃ and 35 ℃. When the temperature of any battery is higher than 40 ℃, the battery cooling function is started, when the temperature of all batteries reaches 35 ℃, the battery cooling is finished, and when the temperature of any battery reaches the higher temperature of 45 ℃, the cooling capacity requirement of the battery cooling is preferentially met. In addition, when the sum of the actual power for temperature regulation of the battery is smaller than the sum of the power required for temperature regulation of the battery, if the average temperature of the battery does not exceed 45 ℃, the demand for cooling capacity in the vehicle cabin is still prioritized, and if the cooling power in the vehicle cabin is sufficient and reaches equilibrium, the cooling power of the battery is increased.

In the starting process of the battery cooling function, if the air conditioner needs to be started in the compartment, the ambient temperature in the compartment needs to be monitored and controlled, so that the ambient temperature at each position in the compartment keeps balanced, and meanwhile, the requirement of battery cooling can be met. As shown in fig. 5, when it is detected that the air temperatures of the areas near the first air outlet and the second air outlet are higher than the air temperatures of the areas near the third air outlet and the fourth air outlet by more than 3 ℃, the opening degree of the first battery cooling branch is controlled to decrease, the opening degree of the first in-vehicle cooling branch 301 is controlled to increase, so that the cooling power of the first in-vehicle cooling branch is increased, the opening degree of the second in-vehicle cooling branch is controlled to decrease by the vehicle-mounted air conditioner, the cooling power of the second in-vehicle cooling branch is increased, the cooling power of the battery cooling branches is kept unchanged as a whole, and meanwhile, the air temperatures of the areas near the air outlets at all positions of the carriage are balanced.

When the temperature of the area near the third air outlet and the fourth air outlet is detected to be higher than the temperature of the area near the first air outlet 100 and the second air outlet by more than 3 ℃, the opening degree of the second battery cooling branch 202 is controlled to be reduced, the opening degree of the second vehicle internal cooling branch is increased, so that the cooling power of the second vehicle internal cooling branch is increased, the vehicle-mounted air conditioner controls the opening degree of the first vehicle internal cooling branch to be reduced, the opening degree of the first battery cooling branch is increased, and the cooling power of the first vehicle internal cooling branch 301 is reduced. When the difference between the air temperatures of the areas near the first air outlet and the second air outlet and the air temperatures of the areas near the third air outlet and the fourth air outlet are detected to be within 3 ℃, the opening degrees of the first battery cooling branch and the second battery cooling branch are controlled to be the same, and the opening degrees of the first in-vehicle cooling branch and the second in-vehicle cooling branch are controlled to be the same, so that the cooling powers of the first in-vehicle cooling branch and the second in-vehicle cooling branch in the compartment are ensured to be the same.

In summary, according to the temperature adjustment method for the vehicle-mounted battery in the embodiment of the invention, the temperatures of the two batteries are firstly obtained, then whether the temperature difference between the two batteries is greater than the preset temperature threshold value or not is judged, and if the temperature difference between the two batteries is greater than the preset temperature threshold value, the temperatures of the two batteries are balanced, so that the cycle life of the batteries can be prolonged. And the temperature of the battery can be adjusted according to the actual temperature of the vehicle-mounted battery 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 in a preset range, and the condition that the performance of the vehicle-mounted battery is influenced due to too high or too low temperature is avoided.

Furthermore, an embodiment of 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 temperature adjustment method described above.

The non-transitory computer-readable storage medium of the embodiment of the invention first obtains the temperatures of the two batteries, then judges whether the temperature difference between the two batteries is greater than a preset temperature threshold, and if so, balances the temperatures of the two batteries through the semiconductor heat exchange module, so that the temperatures of the two batteries can be equalized through the semiconductor heat exchange module when the temperature difference between the two batteries is large, and the cycle life of the batteries can be prolonged.

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

1. A temperature adjustment system of a vehicle-mounted battery, characterized by comprising:

the vehicle-mounted air conditioning module comprises a first refrigeration branch, a second refrigeration branch, a first battery cooling branch and a second battery cooling branch, wherein the first refrigeration branch comprises a first compressor, the second refrigeration branch comprises a second compressor, the first battery cooling branch comprises a first heat exchanger, the second battery cooling branch comprises a second heat exchanger, the first compressor is respectively connected with the first heat exchanger and the second heat exchanger through a first flow regulating part to form a loop, and the second compressor is respectively connected with the first heat exchanger and the second heat exchanger through a second flow regulating part to form a loop;

the semiconductor heat exchange module comprises a cooling end and a heating end, wherein a heat exchange branch of a first battery and the first battery heat management module can be selectively communicated with at least one of the first heat exchanger and the cooling end of the semiconductor heat exchange module to form a heat exchange flow path, and a heat exchange branch of a second battery and the second battery heat management module can be selectively communicated with at least one of the second heat exchanger and the heating end of the semiconductor heat exchange module to form a heat exchange flow path;

a battery thermal management module comprising a first battery thermal management module and a second battery thermal management module, the first end of the first battery thermal management module is respectively connected with the first end of the first heat exchanger and the first end of the heating end in the semiconductor heat exchange module through a first three-way valve, the second end of the first battery thermal management module is respectively connected with the second end of the first heat exchanger and the second end of the heating end in the semiconductor heat exchange module through a second three-way valve, the first end of the second battery thermal management module is respectively connected with the first end of the second heat exchanger and the first end of the cooling end in the semiconductor heat exchange module through a third three-way valve, the second end of the second battery thermal management module is respectively connected with the second end of the second heat exchanger and the second end of the cooling end in the semiconductor heat exchange module through a fourth three-way valve;

a controller connected with the vehicle-mounted air conditioning module, the battery thermal management module and the semiconductor heat exchange module, wherein,

the controller is used for acquiring the temperatures of the first battery and the second battery; judging whether the temperature difference between the two batteries is greater than a preset temperature threshold value or not; if the temperature difference is larger than the preset temperature threshold, controlling the power supply direction of the semiconductor heat exchange module to connect the battery with low temperature with the heating end in the semiconductor heat exchange module and connect the battery with high temperature with the cooling end in the semiconductor heat exchange module; generating an equilibrium demand power according to a temperature difference between the two batteries and a target time, wherein the equilibrium demand power includes a heating demand power and a cooling demand power, and in a case where the temperature of the first battery is lower than the temperature of the second battery, the generating the equilibrium demand power according to the temperature difference between the two batteries and the target time includes:

obtaining the heating required power according to the temperature difference and the target time and a first formula;

the first formula includes:

；

obtaining the cooling required power according to the temperature difference and the target time and a second formula;

the second formula includes:

；

wherein, Delta T₁Is the temperature difference between the two batteries, t is the target time, C is the specific heat capacity of the batteries, M₁Is the mass of the first battery, M₂Is the mass of the second cell, I₁Is the current of the first battery, I₂Is the current of the second battery, R₁Is the internal resistance, R, of the first battery₂Is the internal resistance of the second battery;

and the semiconductor heat exchange module is used for balancing the temperatures of the two batteries according to the balancing required power control.

2. The temperature adjustment system of the vehicle-mounted battery according to claim 1, wherein the first flow regulator includes a first regulation valve and a second regulation valve, the second flow regulator includes a third regulation valve and a fourth regulation valve, the first compressor is connected to the first heat exchanger through the first regulation valve to form a circuit, the first compressor is connected to the second heat exchanger through the second regulation valve to form a circuit, the second compressor is connected to the first heat exchanger through the third regulation valve to form a circuit, and the second compressor is connected to the second heat exchanger through the fourth regulation valve to form a circuit.

3. The temperature adjustment system for the vehicle-mounted battery according to claim 1, wherein refrigerant inlets of the first compressor and the second compressor are connected.

4. The vehicle-mounted battery temperature regulation system according to claim 1, wherein the battery thermal management module includes a pump, a first temperature sensor, a second temperature sensor, and a flow rate sensor provided on the heat exchange flow path, the pump, the first temperature sensor, the second temperature sensor, and the flow rate sensor being connected to the controller; wherein:

the pump is used for enabling the medium in the heat exchange flow path to flow;

the first temperature sensor is used for detecting the inlet temperature of the medium flowing into the vehicle-mounted battery;

the second temperature sensor is used for detecting the outlet temperature of the medium flowing out of the vehicle-mounted battery;

the flow velocity sensor is used for detecting the flow velocity of the medium in the heat exchange flow path.

5. The vehicle battery temperature regulation system of claim 4, wherein the battery thermal management module further comprises a media container disposed on the heat exchange flow path, the media container being configured to store and supply media to the heat exchange flow path.

6. The vehicle battery thermostat system of claim 4, wherein the battery thermal management module further comprises a heater connected to the controller for heating the medium in the heat exchange flow path.

7. The on-board battery temperature regulation system according to claim 1, further comprising an in-vehicle cooling branch including a first in-vehicle cooling branch and a second in-vehicle cooling branch.

8. The temperature adjustment system for the in-vehicle battery according to claim 7, wherein the first in-vehicle cooling branch passage is provided in correspondence with a first air outlet and a second air outlet in the vehicle compartment, and the second in-vehicle cooling branch passage is provided in correspondence with a third air outlet and a fourth air outlet in the vehicle compartment.

9. The system for regulating temperature of an on-board battery according to claim 7, wherein the first in-vehicle cooling branch and the second in-vehicle cooling branch each include: and each evaporator 31 is connected with each heat exchanger in parallel and then connected with each compressor in series.

10. The system of claim 1, further comprising a battery status detection module electrically connected to the controller, the battery status detection module configured to detect a current of the on-board battery.

11. A method for adjusting a temperature of a vehicle-mounted battery, characterized in that a vehicle-mounted battery temperature adjusting system comprises: the vehicle-mounted air conditioning module comprises a first refrigeration branch, a second refrigeration branch, a first battery cooling branch and a second battery cooling branch, wherein the first refrigeration branch comprises a first compressor, the second refrigeration branch comprises a second compressor, the first battery cooling branch comprises a first heat exchanger, the second battery cooling branch comprises a second heat exchanger, the first compressor is respectively connected with the first heat exchanger and the second heat exchanger through a first flow regulating part to form a loop, and the second compressor is respectively connected with the first heat exchanger and the second heat exchanger through a second flow regulating part to form a loop; a battery thermal management module comprising a first battery thermal management module and a second battery thermal management module; the semiconductor heat exchange module comprises a first end and a second end, wherein the heat exchange branch of the first battery and the first battery heat management module can be selectively communicated with at least one of the first heat exchanger and the first end of the semiconductor heat exchange module to form a heat exchange flow path; the heat exchange branch of the second battery and the second battery heat management module can be selectively communicated with at least one of the second heat exchanger and the second end of the semiconductor heat exchange module to form a heat exchange flow path, the first end of the first battery heat management module is respectively connected with the first end of the first heat exchanger and the first end of the heating end in the semiconductor heat exchange module through a first three-way valve, the second end of the first battery heat management module is respectively connected with the second end of the first heat exchanger and the second end of the heating end in the semiconductor heat exchange module through a second three-way valve, the first end of the second battery heat management module is respectively connected with the first end of the second heat exchanger and the first end of the cooling end in the semiconductor heat exchange module through a third three-way valve, and the second end of the second battery heat management module is respectively connected with the second end of the second heat exchanger and the second end of the cooling end in the semiconductor heat exchange module through a fourth three-way valve, the method comprises the following steps:

acquiring the temperatures of the first battery and the second battery;

judging whether the temperature difference between the two batteries is greater than a preset temperature threshold value or not;

if the temperature difference is larger than the preset temperature threshold, controlling the power supply direction of the semiconductor heat exchange module to connect the battery with low temperature with the heating end in the semiconductor heat exchange module and connect the battery with high temperature with the cooling end in the semiconductor heat exchange module;

generating an equilibrium demand power according to a temperature difference between the two batteries and a target time, wherein the equilibrium demand power includes a heating demand power and a cooling demand power, and in a case where the temperature of the first battery is lower than the temperature of the second battery, the generating the equilibrium demand power according to the temperature difference between the two batteries and the target time includes:

the first formula includes:

；

the second formula includes:

；

12. The method for adjusting the temperature of the vehicle-mounted battery according to claim 11, further comprising:

acquiring the temperatures of the two batteries;

when the temperature of any battery is greater than a first temperature threshold value, controlling the vehicle-mounted air conditioner to work and entering a cooling mode;

and when the temperature of any battery is less than a second temperature threshold value, controlling the heater to work and entering a heating mode, wherein the first temperature threshold value is greater than the second temperature threshold value.

13. The method for adjusting the temperature of the vehicle-mounted battery according to claim 11, wherein the battery thermal management module includes a pump, a first temperature sensor, a second temperature sensor, a flow rate sensor, a heater, and a medium container that are provided on the heat exchange flow path; wherein: the pump is used for enabling the medium in the heat exchange flow path to flow; the first temperature sensor is used for detecting the inlet temperature of the medium flowing into the vehicle-mounted battery; the second temperature sensor is used for detecting the outlet temperature of the medium flowing out of the vehicle-mounted battery; the flow velocity sensor is used for detecting the flow velocity of the medium in the heat exchange flow path; the medium container is used for storing and supplying a medium to the heat exchange flow path; the heater is used for heating the medium in the heat exchange flow path, and the method further comprises the following steps:

acquiring the actual temperature regulation power of the battery;

acquiring the temperature regulation required power of the battery;

adjusting the temperature of the two batteries according to the temperature adjustment actual power and the temperature adjustment required power of the batteries; the required power for temperature adjustment is the power which needs to be provided for the battery when the temperature of the battery is adjusted to the target temperature within the target time, and the actual power for temperature adjustment is the actual power obtained by the battery when the temperature of the battery is currently adjusted.

14. The method according to claim 13, wherein the adjusting the temperatures of the two batteries according to the temperature adjustment actual power and the temperature adjustment required power of the battery specifically comprises:

judging whether the temperature regulation required power of each battery is larger than the temperature regulation actual power;

when the cooling mode is adopted, if the temperature regulation required power of a certain battery is larger than the temperature regulation actual power, the power of the compressor is increased;

when the heating mode is selected, if the temperature regulation demand power of a certain battery is larger than the temperature regulation actual power, the heating power of the heater is increased.

15. The method for adjusting the temperature of the vehicle-mounted battery according to claim 14, characterized by further comprising:

when the cooling mode is adopted and the temperature of the first battery is greater than that of the second battery, the opening degree of the first battery cooling branch is increased and the opening degree of the second battery cooling branch is decreased;

when the cooling mode is adopted and the temperature of the second battery is greater than that of the first battery, the opening degree of the second battery cooling branch is increased and the opening degree of the first battery cooling branch is decreased.

16. The method for adjusting temperature of a vehicle-mounted battery according to claim 14,

when the battery is in a cooling mode and the temperature of the first battery is higher than that of the second battery, controlling the power supply direction of the semiconductor heat exchange module and the opening/closing of the channels of the first to fourth three-way valves to enable the cooling end of the semiconductor heat exchange module to be connected with the first heat exchanger;

and when the battery is in a cooling mode and the temperature of the second battery is higher than that of the first battery, controlling the power supply direction of the semiconductor heat exchange module and the opening/closing of the channels of the first to fourth three-way valves to connect the cooling end of the semiconductor heat exchange module with the second heat exchanger.

17. The method for adjusting the temperature of the vehicle-mounted battery according to claim 14, further comprising:

when the heating mode is adopted and the temperature of the first battery is lower than that of the second battery, controlling the power supply direction of the semiconductor heat exchange module and the opening/closing of the channels of the first to fourth three-way valves to connect the heating end of the semiconductor heat exchange module with the first heat exchanger;

and when the heating mode is adopted and the temperature of the second battery is lower than that of the first battery, controlling the power supply direction of the semiconductor heat exchange module and the opening/closing of the channels of the first to fourth three-way valves to connect the heating end of the semiconductor heat exchange module with the second heat exchanger.

18. The method for adjusting the temperature of the vehicle-mounted battery according to claim 11, further comprising: the temperature regulation system of the vehicle-mounted battery further comprises in-vehicle cooling branches, each in-vehicle cooling branch comprises an evaporator, the two evaporators are connected with the two heat exchangers in parallel and then connected with the two compressors in series, the in-vehicle cooling branch comprises a first in-vehicle cooling branch and a second in-vehicle cooling branch, and the method further comprises the following steps:

judging whether the temperature of the battery reaches a third preset temperature or not;

if the third preset temperature is reached, reducing the opening degrees of the first in-vehicle cooling branch and the second in-vehicle cooling branch, and simultaneously increasing the opening degrees of the first battery cooling branch and the second battery cooling branch;

if the temperature does not reach the third preset temperature, further judging whether the temperature in the carriage reaches the set temperature of the air conditioner;

and if the set temperature of the air conditioner is reached, reducing the opening degrees of the first in-vehicle cooling branch and the second in-vehicle cooling branch, and increasing the opening degrees of the first battery cooling branch and the second battery cooling branch.

19. The method of claim 18, wherein the first in-vehicle cooling branch corresponds to a first vent and a second vent in a vehicle compartment, and the second in-vehicle cooling branch corresponds to a third vent and a fourth vent in the vehicle compartment, the method further comprising:

when the temperatures of the first air outlet and the second air outlet are higher than the temperatures of the third air outlet and the fourth air outlet, increasing the opening degree of the first in-vehicle cooling branch and reducing the opening degree of the second in-vehicle cooling branch;

and when the temperatures of the first air outlet and the second air outlet are lower than the temperatures of the third air outlet and the fourth air outlet, increasing the opening degree of the second in-vehicle cooling branch and reducing the opening degree of the first in-vehicle cooling branch.

20. A non-transitory computer-readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the temperature adjustment method of the in-vehicle battery according to any one of claims 11 to 19.