Battery thermal management method and system for electric vehicle under high temperature working condition

Abstract

The application provides a battery thermal management method and system for an electric vehicle under high-temperature working conditions, and comprises the following steps: judging the working condition of the battery of the electric vehicle; if the battery of the electric vehicle is under high-temperature fast-charging working conditions, then according to the size of the current maximum temperature of the battery and the battery cooling temperature threshold, in combination with the relationship between the battery SOC value and the fast-charging target value, the operation of the cooling system is controlled; if the battery of the electric vehicle is under high-temperature discharging working conditions, then according to the size of the current maximum temperature of the battery and the battery cooling temperature threshold, in combination with the relationship between the battery SOC value and the discharging target value, and the size of the current discharging current and the duration of the discharging current, the operation of the cooling system is controlled. The application can control the opening of the cooling system in a timely manner according to the working conditions, reduce the energy consumption of the battery, and ensure that the temperature of the battery is in an appropriate state during work.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle technology, and in particular relates to a battery thermal management method and system for electric vehicles under high-temperature conditions. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] New energy vehicles have become an important industry in curbing global warming and promoting energy conservation and emission reduction. The lithium-ion batteries used in new energy vehicles need to be within a suitable temperature range to achieve their maximum capacity. To maintain lithium-ion batteries within this suitable temperature range during operation, many methods have been adopted, such as liquid cooling / liquid heating and direct cooling / heating. Numerous thermal management strategies have also been developed, such as battery preheating and insulated charging ports. However, the energy consumption of battery thermal management is now attracting attention, and many measures are being taken to reduce this energy consumption, such as raising the threshold for heating and cooling activation and adopting direct cooling / heating methods.

[0004] This technical solution can reduce the energy consumption of battery thermal management. Existing thermal management strategies primarily rely on the highest and lowest temperatures of the battery cells collected by temperature sensors to determine whether thermal management needs to be activated. However, in certain specific situations, such as high-temperature environments, cooling functions are required to maintain the battery temperature within a suitable range. But when the battery's state of charge (SOC) is high, the charging current decreases, and the heat generation also decreases. If only the battery's own temperature is considered, and the previous cooling strategy is still used, the battery temperature may continue to drop, increasing energy consumption. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a battery thermal management method and system for electric vehicles under high-temperature conditions. When the battery is under high-temperature fast charging conditions, the battery SOC value is used as an auxiliary judgment condition. When the battery is under high-temperature discharging conditions, the discharge current, the duration of the discharge current, and the battery SOC value are used as auxiliary judgment conditions. The system can control the opening of the cooling system in a timely manner according to the operating conditions, thereby reducing battery energy consumption while ensuring that the battery temperature is in a suitable state during operation.

[0006] To achieve the above objectives, a first aspect of the present invention provides a battery thermal management method for electric vehicles under high-temperature conditions, comprising:

[0007] Determine the operating conditions of the electric vehicle battery;

[0008] If the electric vehicle battery is in a high-temperature fast charging condition, the coolant flow rate and coolant temperature will be adjusted based on the comparison between the battery SOC value and the fast charging target value, combined with the current highest temperature of the electric vehicle battery and the size of different battery cooling thresholds, to control the operation of the cooling system.

[0009] If the electric vehicle battery is in a high-temperature discharge condition, the coolant flow rate and coolant temperature are adjusted according to the relationship between the battery SOC value and the discharge target value, the magnitude and duration of the current discharge current, and the relationship between the current highest temperature of the electric vehicle battery and the cooling threshold of different batteries, so as to control the operation of the cooling system.

[0010] A second aspect of the present invention provides a battery thermal management system for electric vehicles under high-temperature conditions, comprising:

[0011] Judgment module: Used to determine the operating conditions of the electric vehicle battery;

[0012] The high-temperature fast charging condition management module is used to adjust the coolant flow rate and coolant temperature and control the operation of the cooling system when the electric vehicle battery is in a high-temperature fast charging condition, based on the comparison between the battery SOC value and the fast charging target value, combined with the current highest temperature of the electric vehicle battery and the size of different battery cooling thresholds.

[0013] The high-temperature discharge condition management module is used to adjust the coolant flow rate and coolant temperature when the electric vehicle battery is in a high-temperature discharge condition. This is based on the relationship between the battery's SOC value and the discharge target value, as well as the magnitude and duration of the current discharge current, and the relationship between the current highest temperature of the electric vehicle battery and the cooling threshold of different batteries. This controls the operation of the cooling system.

[0014] A third aspect of the present invention provides a computer device, comprising: a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor communicates with the memory via the bus, and when the machine-readable instructions are executed by the processor, a battery thermal management method for electric vehicles under high-temperature conditions is performed.

[0015] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs a battery thermal management method for electric vehicles under high-temperature conditions.

[0016] The above one or more technical solutions have the following beneficial effects:

[0017] In this invention, when the battery is under high-temperature fast charging conditions, State of Charge (SOC) is added as an auxiliary judgment condition. Based on the relationship between the battery SOC value and the fast charging target value, the cooling system is controlled to optimize the cooling system's activation conditions and reduce energy consumption during battery cooling and heating. When the battery is under high-temperature discharge conditions, both the discharge current and SOC affect the battery's heat generation. Using only the discharge current as an auxiliary condition would lead to continuous changes in cooling conditions. This invention uses the discharge current and its duration as auxiliary judgment conditions, combined with the battery's SOC value, to effectively control the operation of the cooling system, adjust the battery thermal management strategy in a timely manner, reduce energy consumption, and ensure that the lithium-ion battery temperature is maintained within a suitable temperature range during operation.

[0018] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a flowchart illustrating the thermal management strategy determination during high-temperature fast charging in Embodiment 1 of the present invention.

[0021] Figure 2 This refers to the heat generation power of the battery cell under different discharge rates under high-temperature conditions in Embodiment 1 of the present invention.

[0022] Figure 3 This refers to the heat generation power of the battery cell under different SOCs during discharge under high-temperature conditions in Embodiment 1 of the present invention.

[0023] Figure 4 This is a flowchart illustrating the thermal management strategy determination during high-temperature discharge in Embodiment 1 of the present invention. Detailed Implementation

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0026] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0027] Example 1

[0028] The embodiment discloses a battery thermal management method for electric vehicles under high-temperature conditions, including:

[0029] Determine the operating conditions of the electric vehicle battery;

[0030] If the electric vehicle battery is in a high-temperature fast charging condition, the coolant flow rate and coolant temperature will be adjusted based on the comparison between the battery SOC value and the fast charging target value, combined with the current highest temperature of the electric vehicle battery and the size of different battery cooling thresholds, to control the operation of the cooling system.

[0031] If the electric vehicle battery is in a high-temperature discharge condition, the coolant flow rate and coolant temperature are adjusted according to the relationship between the battery SOC value and the discharge target value, the magnitude and duration of the current discharge current, and the relationship between the current highest temperature of the electric vehicle battery and the cooling threshold of different batteries, so as to control the operation of the cooling system.

[0032] If the electric vehicle battery is in a high-temperature fast charging condition, and the current highest temperature of the electric vehicle battery is not less than the first battery cooling temperature threshold, then the relationship between the battery SOC value and the fast charging target value is determined.

[0033] In this embodiment, the determination of the relationship between the battery SOC value and the fast charging target value specifically includes:

[0034] If the current battery SOC value is less than the first fast charging target value, the cooling system will start running. After the cooling system is started, if the current highest battery temperature is less than the second battery cooling temperature threshold, the cooling system will be turned off.

[0035] If the current battery SOC value is greater than the first fast charging target value and not greater than the second fast charging target value, and if the current highest battery temperature is not less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system will operate. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the second battery cooling temperature threshold and the set fluctuation value, then the cooling system will be turned off.

[0036] If the current battery SOC value is greater than the second fast charging target value, and if the current highest battery temperature is not less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system will operate. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the second battery cooling temperature threshold and the set fluctuation value, then the cooling system will be turned off.

[0037] In this embodiment, the determination of the relationship between the battery SOC value and the fast charging target value further includes:

[0038] If the current battery SOC value is greater than the first fast charging target value but not greater than the second fast charging target value, and if the current highest battery temperature is less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off.

[0039] If the current battery SOC value is greater than the second fast charging target value, and if the current highest battery temperature is less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system will be shut down.

[0040] In this embodiment, if the electric vehicle battery is in a high-temperature discharge condition and the current highest temperature of the electric vehicle battery is not less than the third battery cooling temperature threshold, then the relationship between the battery SOC value and the discharge target value, as well as the magnitude and duration of the current discharge current, are determined.

[0041] In this embodiment, if the electric vehicle battery is in a high-temperature discharge condition, and the current highest temperature of the electric vehicle battery is not lower than the third battery cooling temperature threshold, specifically including:

[0042] If the current battery SOC value is not greater than the first discharge target value, the discharge current is not less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is less than the fourth battery cooling temperature threshold, then the cooling system is turned off.

[0043] If the current battery SOC value is not greater than the first discharge target value, the discharge current is less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, and if the current highest battery temperature is not less than the sum of the third battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is less than the sum of the fourth battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off.

[0044] In this embodiment, if the electric vehicle battery is in a high-temperature discharge condition and the current highest temperature of the electric vehicle battery is not lower than the third battery cooling temperature threshold, the method further includes:

[0045] If the current battery SOC value is greater than the first discharge target value, the discharge current is not less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, and if the current highest battery temperature is not less than the sum of the third battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the fourth battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off.

[0046] If the current battery SOC value is greater than the first discharge target value, the discharge current is less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, and if the current highest battery temperature is not less than the sum of the third battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the fourth battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off.

[0047] Among them, the first fast charging target value is less than the second fast charging target value, the first battery cooling temperature threshold is greater than the second battery cooling temperature threshold, and the third battery cooling temperature threshold is greater than the fourth battery cooling temperature threshold.

[0048] Understandably, the discharge target value, discharge rate setting value, first preset time for judging the duration of power generation current, set fluctuation value, and battery cooling temperature threshold can be set to specific values ​​based on the overall vehicle performance and cell heat generation.

[0049] like Figures 1-4 As shown, this embodiment discloses a battery thermal management method for electric vehicles under high-temperature conditions, specifically including: under normal circumstances, T2 < T1, T4 < T3;

[0050] like Figure 1 As shown, when the battery is in a high-temperature fast charging condition, and when the battery's highest temperature T... max When the temperature reaches or exceeds the first battery cooling temperature threshold T1, the following judgment is activated:

[0051] If the battery's SOC is ≤60%, turn on cooling at a flow rate of 12L / min and a target water temperature of 20℃. Under these conditions, when the battery's highest temperature is ≤ the second battery cooling temperature threshold T2, turn off cooling.

[0052] If 60% < battery SOC ≤ 90%, determine the battery's highest temperature T. max Is it greater than or equal to (T1+5)? If yes, turn on cooling with a flow rate of 12L / min and a target water temperature of 20℃. Under these conditions, when the battery's highest temperature is ≤ (T2+5), turn off cooling. If not, turn off cooling.

[0053] If 90% < battery SOC, determine the battery's maximum temperature T. max Is it greater than or equal to (T1+5)? If yes, turn on cooling with a flow rate of 10L / min and a target water temperature of 25℃. Under these conditions, when the battery’s maximum temperature is ≤ (T2+5), turn off cooling. If not, turn off cooling.

[0054] like Figure 4 As shown, when the battery is under high-temperature discharge conditions, and when the battery's highest temperature T... max When the third battery cooling temperature threshold T3 is ≥, the judgment is activated:

[0055] When the battery's SOC is ≤30%, the discharge current is ≥0.5C and the duration is ≥15s, cooling is turned on with a flow rate of 12L / min and a target water temperature of 20℃. Under these conditions, when the battery's highest temperature is ≤4 battery cooling temperature threshold T4, cooling is turned off.

[0056] When the battery's SOC is ≤30%, the discharge current is <0.5C and the duration is ≥15s, determine whether the battery's maximum temperature Tmax is greater than or equal to (T3+5); if so, turn on the cooling system with a flow rate of 12L / min and a target water temperature of 20℃. Under these conditions, when the battery's maximum temperature is ≤(T4+5), turn off the cooling system.

[0057] When the battery's SOC is greater than 30%, the discharge current is greater than or equal to 0.5C and the duration is greater than or equal to 15s, determine whether the battery's maximum temperature Tmax is greater than or equal to (T3+5); if so, turn on the cooling system with a flow rate of 12L / min and a target water temperature of 20℃. Under these conditions, when the battery's maximum temperature is less than or equal to (T4+5), turn off the cooling system.

[0058] When the battery's SOC is greater than 30%, the discharge current is less than 0.5C, and the duration is greater than or equal to 15s, determine whether the battery's maximum temperature Tmax is greater than or equal to (T3+5). If so, turn on the cooling system with a flow rate of 10L / min and a target water temperature of 25℃. Under these conditions, when the battery's maximum temperature is less than or equal to (T4+5), turn off the cooling system.

[0059] It should be noted that the specific values ​​in the above judgment conditions are only for illustrative purposes and do not mean that these values ​​must be used. The specific SOC, rate, discharge current duration, inlet and outlet water flow rate and temperature are selected based on the overall vehicle performance and the heat generation of the battery cell.

[0060] In this embodiment, when the battery is under high-temperature fast charging conditions, State of Charge (SOC) is used as an auxiliary judgment condition. When the battery SOC is low, the corresponding charging current is large, and the cell generates a lot of heat. Therefore, the maximum cooling capacity should be activated to ensure the battery temperature remains within a suitable range. When the battery SOC is high, the corresponding charging current is also small, and the time before charging cutoff is short. Therefore, the cooling activation temperature can be appropriately increased, the coolant temperature increased, and the flow rate reduced to decrease battery energy consumption.

[0061] When a battery is under high-temperature discharge conditions, both the discharge current and the state of charge (SOC) affect the battery's heat generation. However, in practical applications, the discharge current is not a stable value. Adding the discharge current as an auxiliary condition may cause the cooling conditions to change continuously. Therefore, it is necessary to limit the duration of the discharge current and use both the battery's SOC and the discharge current as auxiliary judgment conditions.

[0062] Example 2

[0063] The purpose of this embodiment is to provide a battery thermal management system for electric vehicles under high-temperature conditions, including:

[0064] Judgment module: Used to determine the operating conditions of the electric vehicle battery;

[0065] The high-temperature fast charging condition management module is used to adjust the coolant flow rate and coolant temperature and control the operation of the cooling system when the electric vehicle battery is in a high-temperature fast charging condition, based on the comparison between the battery SOC value and the fast charging target value, combined with the current highest temperature of the electric vehicle battery and the size of different battery cooling thresholds.

[0066] The high-temperature discharge condition management module is used to adjust the coolant flow rate and coolant temperature when the electric vehicle battery is in a high-temperature discharge condition. This is based on the relationship between the battery's SOC value and the discharge target value, as well as the magnitude and duration of the current discharge current, and the relationship between the current highest temperature of the electric vehicle battery and the cooling threshold of different batteries. This controls the operation of the cooling system.

[0067] Example 3

[0068] The purpose of this embodiment is to provide a computing device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method.

[0069] Example 4

[0070] The purpose of this embodiment is to provide a computer-readable storage medium.

[0071] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the above method.

[0072] The steps and methods involved in the apparatuses of Embodiments 2, 3, and 4 above correspond to those in Embodiment 1. For specific implementation details, please refer to the relevant description section of Embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood as including any medium capable of storing, encoding, or carrying an instruction set for execution by a processor and enabling the processor to perform any of the methods in this invention.

[0073] Those skilled in the art will understand that the modules or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. The present invention is not limited to any particular combination of hardware and software.

[0074] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A battery thermal management method for electric vehicles under high-temperature conditions, characterized in that, include: Determine the operating conditions of the electric vehicle battery; If the electric vehicle battery is in a high-temperature fast charging condition, the coolant flow rate and coolant temperature will be adjusted based on the comparison between the battery SOC value and the fast charging target value, combined with the current highest temperature of the electric vehicle battery and the size of different battery cooling thresholds, to control the operation of the cooling system. If the electric vehicle battery is in a high-temperature discharge condition, the coolant flow rate and coolant temperature are adjusted according to the relationship between the battery SOC value and the discharge target value, the magnitude and duration of the current discharge current, and the relationship between the current highest temperature of the electric vehicle battery and the cooling threshold of different batteries, so as to control the operation of the cooling system. If the electric vehicle battery is in a high-temperature discharge condition, and the current highest temperature of the electric vehicle battery is not less than the third battery cooling temperature threshold, then the relationship between the battery SOC value and the discharge target value, as well as the magnitude and duration of the current discharge current, are judged. If the electric vehicle battery is in a high-temperature discharge condition, and the current highest temperature of the electric vehicle battery is not lower than the third battery cooling temperature threshold, specifically including: If the current battery SOC value is not greater than the first discharge target value, the discharge current is not less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is less than the fourth battery cooling temperature threshold, then the cooling system is turned off. If the current battery SOC value is not greater than the first discharge target value, the discharge current is less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, and if the current highest battery temperature is not less than the sum of the third battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is less than the sum of the fourth battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off.

2. The battery thermal management method for electric vehicles under high-temperature conditions as described in claim 1, characterized in that, If the electric vehicle battery is in a high-temperature fast charging condition, and the current highest temperature of the electric vehicle battery is not less than the first battery cooling temperature threshold, then the relationship between the battery SOC value and the fast charging target value is determined.

3. The battery thermal management method for electric vehicles under high-temperature conditions as described in claim 2, characterized in that, The comparison between the battery SOC value and the fast charging target value specifically includes: If the current battery SOC value is less than the first fast charging target value, the cooling system will start running. After the cooling system is started, if the current highest battery temperature is less than the second battery cooling temperature threshold, the cooling system will be turned off. If the current battery SOC value is greater than the first fast charging target value and not greater than the second fast charging target value, and if the current highest battery temperature is not less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system will operate. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the second battery cooling temperature threshold and the set fluctuation value, then the cooling system will be turned off. If the current battery SOC value is greater than the second fast charging target value, and if the current highest battery temperature is not less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system will operate. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the second battery cooling temperature threshold and the set fluctuation value, then the cooling system will be turned off.

4. The battery thermal management method for electric vehicles under high-temperature conditions as described in claim 3, characterized in that, The comparison between the battery SOC value and the fast charging target value also includes: If the current battery SOC value is greater than the first fast charging target value but not greater than the second fast charging target value, and if the current highest battery temperature is less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off. If the current battery SOC value is greater than the second fast charging target value, and if the current highest battery temperature is less than the sum of the first battery cooling temperature threshold and the set fluctuation value, then the cooling system will be shut down.

5. The battery thermal management method for electric vehicles under high-temperature conditions as described in claim 1, characterized in that, If the electric vehicle battery is under high-temperature discharge conditions, and the current highest temperature of the electric vehicle battery is not lower than the third battery cooling temperature threshold, it also includes: If the current battery SOC value is greater than the first discharge target value, the discharge current is not less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, and if the current highest battery temperature is not less than the sum of the third battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the fourth battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off. If the current battery SOC value is greater than the first discharge target value, the discharge current is less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, and if the current highest battery temperature is not less than the sum of the third battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is not greater than the sum of the fourth battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off.

6. A battery thermal management system for electric vehicles under high-temperature conditions, characterized in that, include: Judgment module: Used to determine the operating conditions of the electric vehicle battery; The high-temperature fast charging condition management module is used to adjust the coolant flow rate and coolant temperature and control the operation of the cooling system when the electric vehicle battery is in a high-temperature fast charging condition, based on the comparison between the battery SOC value and the fast charging target value, combined with the current highest temperature of the electric vehicle battery and the size of different battery cooling thresholds. The high-temperature discharge condition management module is used to adjust the coolant flow rate and coolant temperature and control the operation of the cooling system when the electric vehicle battery is in a high-temperature discharge condition, based on the relationship between the battery SOC value and the discharge target value, the magnitude and duration of the current discharge current, and the relationship between the current highest temperature of the electric vehicle battery and the cooling threshold of different batteries. If the electric vehicle battery is in a high-temperature discharge condition, and the current highest temperature of the electric vehicle battery is not less than the third battery cooling temperature threshold, then the relationship between the battery SOC value and the discharge target value, as well as the magnitude and duration of the current discharge current, are judged. If the electric vehicle battery is in a high-temperature discharge condition, and the current highest temperature of the electric vehicle battery is not lower than the third battery cooling temperature threshold, specifically including: If the current battery SOC value is not greater than the first discharge target value, the discharge current is not less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is less than the fourth battery cooling temperature threshold, then the cooling system is turned off. If the current battery SOC value is not greater than the first discharge target value, the discharge current is less than the discharge rate setting value, and the discharge current duration is not less than the first preset time, and if the current highest battery temperature is not less than the sum of the third battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned on. After the cooling system is turned on, if the current highest battery temperature is less than the sum of the fourth battery cooling temperature threshold and the set fluctuation value, then the cooling system is turned off.

7. A computer device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the computer device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, they perform a battery thermal management method for electric vehicles under high-temperature conditions as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, performs a battery thermal management method for electric vehicles under high-temperature conditions as described in any one of claims 1 to 5.

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