Battery thermal management control method and device and vehicle

Abstract

The embodiment of the invention provides a battery thermal management control method and device and a vehicle, and the method is applied to a battery management system and comprises the steps that when it is determined that a battery has a thermal management requirement, the target duty ratio of a water pump and the target temperature of cooling liquid are calculated; a water pump adjusting instruction is sent to the vehicle control unit, and a water pump is controlled to pump cooling liquid to the battery based on the water pump target duty ratio; and a temperature adjusting instruction is sent to an air conditioner control unit or a cooling liquid heater, and the air conditioner control unit or the cooling liquid heater is controlled to adjust the cooling liquid temperature to the cooling liquid target temperature. According to the method, the battery management system can calculate the target duty ratio of the water pump and the target temperature of the cooling liquid when determining that the battery has the thermal management requirement, and calculate the target duty ratio of the water pump and the target temperature of the cooling liquid when determining that the battery has the thermal management requirement; therefore, the water pump and the cooling liquid temperature adjusting device can be controlled to realize the thermal management control of the battery, and the thermal management control right of the battery is realized.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular to a battery thermal management control method and device and a vehicle. Background Art

[0002] At present, the main methods of thermal management of power batteries commonly used include air cooling, liquid cooling, phase change material cooling, liquid heating, heating film heating, etc. Different methods have different heat dissipation and low-temperature heating performance. In the current thermal management control of power batteries, the battery management system (BMS) sends the battery water inlet temperature requirements and battery cell temperature to the vehicle control unit (VCU) and air conditioning control unit (ACCU) respectively. When the power battery needs cooling and heating, the requirements are sent to the corresponding controllers for execution; in this control method, the BMS has no control over battery thermal management. Summary of the invention

[0003] The embodiments of the present application provide a battery thermal management control method and device and a vehicle, and a battery management system can achieve thermal management control over the battery through this method.

[0004] In a first aspect, an embodiment of the present application provides a battery thermal management control method, which is applied to a battery management system. The method includes: when it is determined that the battery has thermal management requirements, calculating a water pump target duty cycle and a coolant target temperature; sending a water pump adjustment instruction to a vehicle controller to control the water pump to pump coolant to the battery based on the water pump target duty cycle; sending a temperature adjustment instruction to an air-conditioning control unit or a coolant heater to control the air-conditioning control unit or the coolant heater to adjust the coolant temperature to the coolant target temperature.

[0005] In a possible implementation, determining that the battery has a thermal management requirement includes: Determine whether the battery has thermal management requirements based on the current battery temperature extreme value, battery operation mode and battery power; wherein, when the battery temperature extreme value, battery operation mode and battery power meet the thermal management conditions, it is determined that the battery has thermal management requirements.

[0006] In one possible implementation, the battery temperature extremes, battery operating mode, and battery power satisfying thermal management conditions include: when the battery temperature extremes are lower than a first temperature threshold or higher than a second temperature threshold, determining that the battery satisfies a first thermal management condition; or when the battery temperature extremes are within a first temperature range or a second temperature range, and the battery operating mode is a charging mode, determining that the battery satisfies a second thermal management condition; or when the battery temperature extremes are within the first temperature range or the second temperature range, and the battery operating mode is a driving mode, and the battery power is higher than a first power threshold, determining that the battery satisfies a third thermal management condition.

[0007] In one possible implementation, determining that the battery has a thermal management requirement includes: when the battery temperature extreme value is lower than a first temperature threshold, determining that the battery has a first heating requirement; when the battery temperature extreme value is higher than a second temperature threshold, determining that the battery has a first cooling requirement; when the battery satisfies a second thermal management condition, wherein the battery temperature extreme value is within a first temperature range, determining that the battery has a second heating requirement; when the battery satisfies a second thermal management condition, wherein the battery temperature extreme value is within a second temperature range, determining that the battery has a second cooling requirement; when the battery satisfies a third thermal management condition, wherein the battery temperature extreme value is within a first temperature range, determining that the battery has a third heating requirement; when the battery satisfies a third thermal management condition, wherein the battery temperature extreme value is within a first temperature range, determining that the battery has a third cooling requirement.

[0008] In one possible implementation, the calculation of the water pump target duty cycle includes: when it is determined that the battery has a first heating requirement, determining the water pump target duty cycle based on a first duty cycle strategy table; when it is determined that the battery has a first cooling requirement, determining the water pump target duty cycle based on a second duty cycle strategy table; when it is determined that the battery has a second heating requirement, determining the water pump target duty cycle based on a third duty cycle strategy table; when it is determined that the battery has a second cooling requirement, determining the water pump target duty cycle based on a fourth duty cycle strategy table; when it is determined that the battery has a third heating requirement, determining the water pump target duty cycle based on a fifth duty cycle strategy table; when it is determined that the battery has a third cooling requirement, determining the water pump target duty cycle based on a sixth duty cycle strategy table.

[0009] In one possible implementation, calculating the coolant target temperature includes: when it is determined that the battery has a first heating requirement, determining the coolant target temperature based on a first temperature strategy table; when it is determined that the battery has a first cooling requirement, determining the coolant target temperature based on a second temperature strategy table; when it is determined that the battery has a second heating requirement, determining the coolant target temperature based on a third temperature strategy table; when it is determined that the battery has a second cooling requirement, determining the coolant target temperature based on a fourth temperature strategy table; when it is determined that the battery has a third heating requirement, determining the coolant target temperature based on a fifth temperature strategy table; when it is determined that the battery has a third cooling requirement, determining the coolant target temperature based on a sixth temperature strategy table.

[0010] In one possible implementation, when the battery temperature extreme value is within the first temperature range or the second temperature range, and the battery operating mode is the idle mode, it is determined that the battery satisfies a fourth thermal management condition; wherein, when it is determined that the battery satisfies the fourth thermal management condition, when the battery temperature extreme value is within the first temperature range, it is determined that the battery has a fourth heating requirement, and when the battery temperature extreme value is within the second temperature range, it is determined that the battery has a fourth cooling requirement.

[0011] In one possible implementation, when it is determined that the battery has a fourth heating requirement, the water pump target duty cycle is determined based on the seventh duty cycle strategy table; when it is determined that the battery has a fourth cooling requirement, the water pump target duty cycle is determined based on the eighth duty cycle strategy table; when it is determined that the battery has a fourth heating requirement, the coolant target temperature is determined based on the seventh temperature strategy table; when it is determined that the battery has a fourth cooling requirement, the coolant target temperature is determined based on the eighth temperature strategy table.

[0012] In a second aspect, an embodiment of the present application further provides a battery thermal management control device, the device comprising: a processor and a memory, the memory being used to store at least one instruction, and the instruction, when loaded and executed by the processor, implements the battery thermal management control method provided in the first aspect.

[0013] In a third aspect, an embodiment of the present application further provides a vehicle, comprising the battery thermal management control device provided in the second aspect.

[0014] Through the above technical solution, through this method, the battery management system can determine whether the battery has thermal management requirements, and when it is determined that the battery has thermal management requirements, the water pump target duty cycle and the coolant target temperature are calculated. When it is determined that the battery has thermal management requirements, the water pump target duty cycle and the coolant target temperature are calculated, and then the water pump and the coolant temperature control device (such as a coolant heater or an air-conditioning control unit) can be controlled to achieve thermal management control of the battery, thereby achieving thermal management control over the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 A schematic diagram of a battery thermal management control method flow chart provided in one embodiment of the present application; Figure 2 A schematic diagram of battery thermal management requirement detection provided by one embodiment of the present application; Figure 3 A schematic diagram of duty cycle and thermal management temperature calculation provided for one embodiment of the present application; Figure 4 A schematic diagram of a thermal management control flow provided for an embodiment of the present application; Figure 5 A schematic diagram of the structure of a battery thermal management control device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] Figure 1 A schematic flow chart of a battery thermal management control method provided in one embodiment of the present application.

[0019] Reference Figure 1 As shown, the method may include the following steps: S101: When it is determined that the battery has a thermal management requirement, a water pump target duty cycle and a coolant target temperature are calculated.

[0020] S102: Sending a water pump adjustment instruction to the vehicle controller to control the water pump to pump coolant to the battery based on the target duty cycle of the water pump.

[0021] S103: Send a temperature adjustment instruction to the air conditioning control unit or the coolant heater to control the air conditioning control unit or the coolant heater to adjust the coolant temperature to the coolant target temperature. For example, the coolant heater may be a water PTC.

[0022] exist Figure 1 In the battery thermal management control technical solution provided by the illustrated embodiment, the battery management system (BMS) can determine whether the battery has a thermal management requirement through the corresponding parameters of the vehicle, and actively calculate the water pump target duty cycle and the coolant target temperature when it is determined that the battery has a thermal management requirement. After completing the above calculation, on the one hand, the battery management system can send a water pump adjustment instruction to the vehicle controller (VCU), wherein the water pump adjustment instruction can include the calculated water pump target duty cycle, and then after the vehicle controller receives the water pump adjustment instruction sent by the battery management system, the water pump can be controlled to pump coolant to the battery based on the water pump target duty cycle. On the other hand, the battery management system can also send a temperature adjustment instruction to the air conditioning control unit (ACCU) or the coolant heater, wherein the temperature adjustment instruction can include the calculated coolant target temperature, and then after the air conditioning control unit or the coolant heater receives the temperature adjustment instruction, the air conditioning control unit or the coolant heater can be controlled to adjust the coolant temperature to the coolant target temperature. Among them, the coolant heater is used to heat the coolant, and the air conditioning control unit is used to cool the coolant.

[0023] Figure 2A schematic diagram of battery thermal management requirement detection provided in one embodiment of the present application.

[0024] Reference Figure 2 As shown, in some embodiments, the battery management system may obtain the battery temperature extreme value, the battery operation mode, and the battery power, and thereby determine whether the battery has thermal management requirements based on the current battery temperature extreme value, the battery operation mode, and the battery power.

[0025] In some embodiments, a vehicle may include multiple battery cells, and a battery management system may monitor the battery temperature in real time based on multiple temperature sensors disposed on the battery cells of the multiple battery cells, and obtain battery temperature extremes from the multiple battery temperatures, the battery temperature extremes including the maximum temperature of the battery cell and the minimum temperature of the battery cell. Exemplarily, a vehicle may include m battery cells, and by real-time monitoring the battery temperatures of the m battery cells, the maximum temperature of the battery cells and the minimum temperature of the battery cells are obtained.

[0026] In some embodiments, the battery operation mode may include power-off, idling, driving, and charging modes, etc. The battery management system may interact with the vehicle management system (VCU) via a CAN line to identify the current vehicle battery operation mode.

[0027] In some embodiments, the battery management system can also determine the battery charge through internal real-time monitoring data.

[0028] In some embodiments, the battery management system can determine whether the battery has thermal management requirements based on the current battery temperature extremes, battery operating mode, and battery power, wherein the battery is determined to have thermal management requirements when the battery temperature extremes, battery operating mode, and battery power meet thermal management conditions.

[0029] In some embodiments, the battery temperature extreme value has a higher priority than the battery operation mode and the battery power. Specifically, the battery management system can pre-set a first temperature threshold and a second temperature threshold. When the battery temperature extreme value is lower than the first temperature threshold or higher than the second temperature threshold, it is determined that the battery meets the first thermal management condition. Specifically, when the battery meets the first thermal management condition, it is determined that the battery has a thermal management requirement without referring to the battery operation mode and the battery power, and the target battery needs to be thermally managed (heated or cooled) immediately.

[0030] In one implementation, when the battery temperature extreme value is lower than a first temperature threshold, it is determined that the battery has a first heating requirement; and when the battery temperature extreme value is higher than a second temperature threshold, it is determined that the battery has a first cooling requirement.

[0031] In some embodiments, the battery management system may also pre-set a first temperature range and a second temperature range. When the battery management system determines that the battery temperature extreme is within the first temperature range or the second temperature range, the battery management system may preliminarily determine that the battery has thermal management requirements. It is also necessary to further determine whether the battery has thermal management requirements in combination with the reference battery operation mode. Specifically, when the battery temperature extreme is within the first temperature range or the second temperature range, and the battery operation mode is a charging mode, it is determined that the battery meets the second thermal management condition. Specifically, when the battery meets the second thermal management condition, since it is in charging mode, there is no need to refer to the battery power problem, then it can be determined that the battery has thermal management requirements, and the battery can be thermally managed.

[0032] In one embodiment, when the battery meets the second thermal management condition, wherein the battery temperature extreme is within the first temperature range, it is determined that the battery has a second heating requirement; when the battery meets the second thermal management condition, wherein the battery temperature extreme is within the second temperature range, it is determined that the battery has a second cooling requirement.

[0033] In some embodiments, the lowest value of the first temperature range may be greater than the first temperature threshold, and the second temperature range as a whole is higher than the first temperature range, and the highest value of the second temperature range is less than the second temperature threshold. On this basis, the specific value ranges of the first temperature range and the second temperature range can be customized according to vehicle requirements and user requirements, and this application does not limit this.

[0034] In some embodiments, when the battery temperature extreme value is within the first temperature range or the second temperature range, and the battery operation mode is the driving mode, it is determined that the battery does not meet the second thermal management condition, and the battery power still needs to be referred to. If the battery power is higher than the first power threshold, it is determined that the battery meets the third thermal management condition, and it is determined that the battery has a thermal management requirement, and the target battery can be thermally managed. Among them, the first power threshold can be customized based on the vehicle battery capacity and user needs, and this application does not limit this.

[0035] In one embodiment, when the battery satisfies a third thermal management condition, wherein the battery temperature extreme is within a first temperature range, it is determined that the battery has a third heating requirement; when the battery satisfies a third thermal management condition, wherein the battery temperature extreme is within a second temperature range, it is determined that the battery has a third cooling requirement.

[0036] Figure 3 A schematic diagram of duty cycle and thermal management temperature calculation provided for one embodiment of the present application.

[0037] Reference Figure 3 As shown, after determining that the battery has a thermal management requirement, a water pump target duty cycle and a coolant target temperature for thermal management control may be calculated.

[0038] In some embodiments, when the battery has different thermal management requirements, the corresponding water pump target duty cycle and coolant target temperature can be obtained based on different strategy tables.

[0039] Specifically, in one embodiment, when it is determined that the battery has a first heating requirement, the target duty cycle of the water pump is determined based on the first duty cycle strategy table. When it is determined that the battery has a first cooling requirement, the target duty cycle of the water pump is determined based on the second duty cycle strategy table. It should be noted that, since the battery is at a lower temperature (lower than the first temperature threshold) or higher temperature (higher than the second temperature threshold) when the battery has a first heating requirement or a first cooling requirement, the battery has an urgent thermal management (heating or cooling) requirement. Specifically, when it is determined that the battery has a first heating requirement, the target duty cycle of the water pump is determined based on the first duty cycle strategy table, and when it is determined that the battery has a first cooling requirement, the target duty cycle of the water pump is determined based on the second duty cycle strategy table. At this time, the coolant flow rate pumped by the water pump is controlled by the target duty cycle of the water pump determined by the first duty cycle strategy table or the second duty cycle strategy table, and the battery can be heated or cooled to the corresponding target temperature more quickly. When it is determined that the battery has a first heating requirement, the coolant target temperature is determined based on the first temperature strategy table; when it is determined that the battery has a first cooling requirement, the coolant target temperature is determined based on the second temperature strategy table.

[0040] In some embodiments, when it is determined that the battery has a second heating requirement, the target duty cycle of the water pump is determined based on the third duty cycle strategy table. When it is determined that the battery has a second cooling requirement, the target duty cycle of the water pump is determined based on the fourth duty cycle strategy table. When it is determined that the battery has a second heating requirement, the target temperature of the coolant is determined based on the third temperature strategy table; when it is determined that the battery has a second cooling requirement, the target temperature of the coolant is determined based on the fourth temperature strategy table. Specifically, when the battery has a second heating requirement or a second cooling requirement, the battery is currently in charging mode. To improve the charging efficiency, the battery temperature can be adjusted to the target charging temperature through battery thermal management, so that charging can be completed in a shorter time. Furthermore, after the battery has been charged for a certain period of time, the battery temperature may rise. In order to achieve rapid charging of the battery in a stable temperature environment, the battery with cooling requirements can also be cooled, so as to control the battery temperature to be stable at the target charging temperature, so as to achieve stable and rapid charging.

[0041] In some embodiments, when it is determined that the battery has a third heating requirement, the target duty cycle of the water pump is determined based on the fifth duty cycle strategy table. When it is determined that the battery has a third cooling requirement, the target duty cycle of the water pump is determined based on the sixth duty cycle strategy table. When it is determined that the battery has a third heating requirement, the target temperature of the coolant is determined based on the fifth temperature strategy table; when it is determined that the battery has a third cooling requirement, the target temperature of the coolant is determined based on the sixth temperature strategy table. Specifically, when the battery has a third heating requirement or a third cooling requirement, the vehicle is in a driving state (i.e., the battery is in a driving operation mode). In order to improve the vehicle's cruising range, battery thermal management can be performed at a lower power, that is, the target duty cycle of the water pump determined by the fifth duty cycle strategy table and the sixth duty cycle strategy table is used to control the coolant flow rate pumped by the water pump to be lower, and only certain thermal management requirements need to be met, so that the battery is at the driving target temperature.

[0042] Figure 4 A schematic diagram of a thermal management control flow provided for one embodiment of the present application.

[0043] Reference Figure 4 As shown, after the battery management system calculates the target duty cycle of the water pump and the target temperature of the coolant, it can send a water pump adjustment instruction to the vehicle controller to control the water pump to pump coolant to the battery based on the target duty cycle of the water pump, and send a temperature adjustment instruction to the air conditioning control unit or the coolant heater to control the air conditioning control unit or the coolant heater to adjust the coolant temperature to the target coolant temperature. Specifically, when the battery needs to be cooled, the battery management system directly outputs the temperature adjustment instruction to the air conditioning control unit, and at the same time sends the required water pump duty cycle requirement to the vehicle controller; when the battery needs to be heated, the temperature adjustment instruction and the water pump adjustment instruction are sent to the vehicle controller, and then the vehicle controller controls the coolant heater to heat the coolant to the target coolant temperature, and controls the water pump to pump coolant to the battery based on the target duty cycle of the water pump.

[0044] In some embodiments, when the battery temperature extreme value is within the first temperature range or the second temperature range, and the battery operation mode is the idle mode, it is determined that the battery meets the fourth thermal management condition; wherein, when it is determined that the battery meets the fourth thermal management condition, when the battery temperature extreme value is within the first temperature range, it is determined that the battery has a fourth heating requirement, and when the battery temperature extreme value is within the second temperature range, it is determined that the battery has a fourth cooling requirement. wherein, when it is determined that the battery has a fourth heating requirement, the target duty cycle of the water pump is determined based on the seventh duty cycle strategy table, and the target temperature of the coolant is determined based on the seventh temperature strategy table. when it is determined that the battery has a fourth cooling requirement, the target duty cycle of the water pump is determined based on the eighth duty cycle strategy table, and the target temperature of the coolant is determined based on the eighth temperature strategy table. specifically, when the battery meets the fourth thermal management condition, there may be a user who still needs to continue driving, for example, the user drives the vehicle into the high-speed service area to rest and does not turn off the engine, and the vehicle battery is still in a powered-on state. in order to provide the vehicle with a battery temperature that is more suitable for driving, the battery can be thermally managed when the vehicle is in idle mode to adjust the battery temperature to the target driving temperature.

[0045] In some application scenarios, there is a situation where the temperature difference between the highest temperature of a battery cell and the lowest temperature of a battery cell among multiple battery cells of a vehicle exceeds a preset temperature difference. If at this time, the battery temperature extreme value does not exceed the temperature threshold, specifically, the highest temperature of the battery cell is not higher than the second temperature threshold, and the lowest temperature of the battery cell is not lower than the first temperature threshold, and the battery power is lower than the second power threshold, in order to save battery power and perform thermal management operations on the battery, the cooling circuits of multiple battery cells can be connected to allow the heat dissipated by multiple battery cells to undergo internal heat exchange, thereby increasing the temperature of the low-temperature battery and lowering the temperature of the high-temperature battery, so that the temperatures of multiple batteries reach a thermal balance, battery thermal management operations are implemented, and battery power loss is reduced.

[0046] Figure 5 A schematic diagram of the structure of a battery thermal management control device provided in one embodiment of the present application.

[0047] Reference Figure 5 As shown, the device includes: a processor 501 and a memory 502, the memory 502 is used to store at least one instruction, and when the instruction is loaded and executed by the processor 501, the battery thermal management control method provided in any embodiment of the present application is implemented.

[0048] The embodiment of the present application also provides a vehicle, which may include Figure 5 The battery thermal management control device provided in the illustrated embodiment can be used to implement the battery thermal management control method provided in any embodiment of the present application.

[0049] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0050] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0051] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0052] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0053] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0054] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery thermal management control method, characterized in that: Applied to a battery management system, the method comprises: When it is determined that the battery has thermal management requirements, a water pump target duty cycle and a coolant target temperature are calculated; sending a water pump adjustment instruction to a vehicle controller to control the water pump to pump coolant to the battery based on the water pump target duty cycle; A temperature adjustment instruction is sent to an air conditioning control unit or a coolant heater to control the air conditioning control unit or the coolant heater to adjust the coolant temperature to the coolant target temperature.

2. The method according to claim 1, characterized in that Determining that the battery has a thermal management requirement includes: Determining whether the battery has thermal management requirements based on current battery temperature extremes, battery operation mode, and battery charge; When the battery temperature extreme value, the battery operation mode and the battery power satisfy the thermal management condition, it is determined that the battery has a thermal management requirement.

3. The method according to claim 2, characterized in that The battery temperature extreme value, battery operation mode, and battery power satisfying the thermal management conditions include: When the battery temperature extreme value is lower than a first temperature threshold or higher than a second temperature threshold, determining that the battery meets a first thermal management condition; or When the battery temperature extreme value is within the first temperature range or the second temperature range, and the battery operation mode is the charging mode, determining that the battery meets the second thermal management condition; or When the battery temperature extreme value is within the first temperature range or the second temperature range, the battery operation mode is the driving mode, and the battery power is higher than a first power threshold, it is determined that the battery meets the third thermal management condition.

4. The method according to claim 3, characterized in that Determining that the battery has a thermal management requirement includes: When the battery temperature extreme value is lower than a first temperature threshold, determining that the battery has a first heating requirement; When the battery temperature extreme value is higher than a second temperature threshold, determining that the battery has a first cooling requirement; When the battery satisfies a second thermal management condition, wherein the battery temperature extreme value is within a first temperature range, determining that the battery has a second heating requirement; When the battery satisfies a second thermal management condition, wherein the battery temperature extreme value is within a second temperature range, determining that the battery has a second cooling requirement; When the battery satisfies a third thermal management condition, wherein the battery temperature extreme value is within a first temperature range, determining that the battery has a third heating requirement; When the battery satisfies a third thermal management condition, wherein the battery temperature extreme value is within a second temperature range, it is determined that the battery has a third cooling requirement.

5. The method according to claim 4, characterized in that The calculation of the target duty cycle of the water pump includes: When it is determined that the battery has a first heating demand, determining a target duty cycle of the water pump based on a first duty cycle strategy table; When it is determined that the battery has a first cooling requirement, determining a target duty cycle of the water pump based on a second duty cycle strategy table; When it is determined that the battery has a second heating requirement, determining a target duty cycle of the water pump based on a third duty cycle strategy table; When it is determined that the battery has a second cooling requirement, determining a target duty cycle of the water pump based on a fourth duty cycle strategy table; When it is determined that the battery has a third heating requirement, determining a target duty cycle of the water pump based on a fifth duty cycle strategy table; When it is determined that the battery has a third cooling requirement, the water pump target duty cycle is determined based on a sixth duty cycle strategy table.

6. The method according to claim 4, characterized in that Calculating the coolant target temperature includes: When it is determined that the battery has a first heating requirement, determining a coolant target temperature based on a first temperature strategy table; When it is determined that the battery has a first cooling requirement, determining a coolant target temperature based on a second temperature strategy table; When it is determined that the battery has a second heating requirement, determining a coolant target temperature based on a third temperature strategy table; When it is determined that the battery has a second cooling requirement, determining a coolant target temperature based on a fourth temperature strategy table; When it is determined that the battery has a third heating requirement, determining a coolant target temperature based on a fifth temperature strategy table; When it is determined that the battery has a third cooling requirement, the coolant target temperature is determined based on a sixth temperature strategy table.

7. The method according to claim 3, characterized in that When the battery temperature extreme value is within the first temperature range or the second temperature range, and the battery operation mode is the idle mode, determining that the battery meets the fourth thermal management condition; When it is determined that the battery meets a fourth thermal management condition, when the battery temperature extreme is within a first temperature range, it is determined that the battery has a fourth heating requirement, and when the battery temperature extreme is within a second temperature range, it is determined that the battery has a fourth cooling requirement.

8. The method according to claim 7, characterized in that When it is determined that the battery has a fourth heating requirement, determining a target duty cycle of the water pump based on a seventh duty cycle strategy table; When it is determined that the battery has a fourth cooling requirement, determining a target duty cycle of the water pump based on an eighth duty cycle strategy table; When it is determined that the battery has a fourth heating requirement, determining a coolant target temperature based on a seventh temperature strategy table; When it is determined that the battery has a fourth cooling requirement, the coolant target temperature is determined based on an eighth temperature strategy table.

9. A battery thermal management control device, characterized in that: The device comprises: A processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the battery thermal management control method according to any one of claims 1 to 8 is implemented.

10. A vehicle, characterized in that: The vehicle includes the battery thermal management control device of claim 9.

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