Battery cooling method and system, storage medium and vehicle

Abstract

The invention discloses a battery cooling method and system, a storage medium and a vehicle. The method comprises the following steps: acquiring a battery thermal management requirement; acquiring a passive cooling flag bit, a battery water inlet temperature, a battery target water inlet temperature, an environment temperature and an electric drive loop water temperature in response to the fact that the thermal management demand is a refrigeration demand; determining a cooling strategy of the battery according to the passive cooling flag bit, the target water inlet temperature of the battery, the environment temperature and the water temperature of the electric drive loop; and controlling the thermal management system to cool the battery according to the cooling strategy. The technical problem that the battery cooling strategy in the prior art is not perfect enough is solved.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more specifically, to a battery cooling method, system, storage medium, and vehicle. Background Technology

[0002] With the rapid development of electric and hybrid vehicles, battery thermal management technology has become a key factor in ensuring battery performance, safety, and extending battery life. However, in existing technologies, battery cooling strategies often rely on fixed cooling modes, making it difficult to meet the cooling needs of different situations, thus resulting in imperfections in existing battery cooling strategies.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This application provides a battery cooling method, system, storage medium, and vehicle to at least address the technical problem that existing battery cooling strategies are not sufficiently effective.

[0005] According to one aspect of the embodiments of this application, a battery cooling method is provided, comprising: acquiring battery thermal management requirements; in response to the thermal management requirements being cooling requirements, acquiring a passive cooling flag, battery inlet water temperature, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature; determining a battery cooling strategy based on the passive cooling flag, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature; and controlling a thermal management system to cool the battery according to the cooling strategy.

[0006] Furthermore, based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature, the battery cooling strategy is determined as follows: in response to the passive cooling flag, the ambient temperature, and the electric drive circuit water temperature meeting a first preset condition, the passive cooling flag is set to the passive cooling position, and the battery cooling strategy is determined to be passive cooling. The first preset condition is that the ambient temperature is less than a first preset temperature threshold and the electric drive circuit water temperature is less than a second preset temperature threshold; wherein, the first preset temperature threshold is less than the second preset temperature threshold.

[0007] Further, based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature, the battery cooling strategy is determined as follows: in response to the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature meeting a second preset condition, the passive cooling flag is set to the passive cooling position, and the battery cooling strategy is determined to be passive cooling. The second preset condition is that the ambient temperature is greater than or equal to a first preset temperature threshold and less than a third preset temperature threshold, the difference between the target inlet water temperature and the ambient temperature is greater than the third preset temperature threshold, and the electric drive circuit water temperature is less than the second preset temperature threshold; wherein, the first preset temperature threshold is less than the third preset temperature threshold, and the third preset temperature threshold is less than the second preset temperature threshold.

[0008] Furthermore, the method also includes: in response to the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature not meeting any of the first preset condition and the second preset condition, setting the passive cooling flag to the non-passive cooling position, and determining the battery cooling strategy as active cooling.

[0009] Furthermore, the method also includes: obtaining the battery inlet water temperature during the passive cooling phase; in response to the battery inlet water temperature and the target battery inlet water temperature meeting a third preset condition, setting the passive cooling flag to a non-passive cooling position, and determining that the battery cooling strategy is active cooling, wherein the third preset condition is that the difference between the battery inlet water temperature and the target battery inlet water temperature is greater than a preset difference and the duration is greater than a preset duration; or, in response to the battery inlet water temperature and the target battery inlet water temperature not meeting the third preset condition, setting the passive cooling flag to a passive cooling position, and determining that the battery cooling strategy is passive cooling.

[0010] Furthermore, the method also includes: in response to thermal management requirements rather than cooling requirements, setting the passive cooling flag to the non-passive cooling position.

[0011] According to another aspect of the embodiments of this application, a battery cooling system is also provided, comprising: a first acquisition module for acquiring battery thermal management requirements; a second acquisition module for acquiring a passive cooling flag, battery inlet water temperature, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature in response to the thermal management requirements; a determination module for determining a battery cooling strategy based on the passive cooling flag, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature; and a control module for controlling the thermal management system to cool the battery according to the cooling strategy.

[0012] According to another aspect of the embodiments of this application, a battery cooling device is also provided, comprising: a first acquisition module for acquiring battery thermal management requirements; a second acquisition module for acquiring a passive cooling flag, battery inlet water temperature, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature in response to the thermal management requirements; a determination module for determining a battery cooling strategy based on the passive cooling flag, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature; and a control module for controlling the thermal management system to cool the battery according to the cooling strategy.

[0013] According to another aspect of the embodiments of this application, a vehicle is also provided, including: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods in various embodiments of this application when it runs.

[0014] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored executable program, wherein, when the executable program is running, it controls the device where the computer-readable storage medium is located to perform the methods of various embodiments of this application.

[0015] According to another aspect of the embodiments of this application, a computer program product is also provided, including a computer program that, when executed by a processor, implements the methods of various embodiments of this application.

[0016] According to another aspect of the embodiments of this application, a computer program product is also provided, including a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods in various embodiments of this application.

[0017] According to another aspect of the embodiments of this application, a computer program is also provided, which, when executed by a processor, implements the methods of the various embodiments of this application.

[0018] In this embodiment, firstly, the battery thermal management requirements are acquired; then, when the thermal management requirement is a cooling requirement, the passive cooling flag, battery inlet water temperature, target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature are acquired; then, based on the passive cooling flag, target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature, a battery cooling strategy is determined; finally, based on the cooling strategy, the thermal management system is controlled to cool the battery. This application first acquires the battery thermal management requirements in real time to determine the current thermal management state of the battery and the required operations. When the thermal management requirement is determined to be a cooling requirement, detailed information such as the passive cooling flag, battery inlet water temperature, target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature is further collected. The passive cooling flag can be used to indicate whether the system can utilize natural cooling methods to cool the battery without activating active cooling equipment. Next, based on this information, a cooling strategy suitable for the current battery state is determined. Finally, the thermal management system is controlled to cool the battery according to the selected cooling strategy. This application achieves the technical objective of improving battery cooling efficiency and reducing energy consumption by responding to battery thermal management needs in real time and intelligently selecting the most energy-efficient cooling method based on environmental and system status. It realizes the technical effect of making the battery cooling strategy more refined and intelligent, thereby solving the technical problem of the imperfect battery cooling strategy in the prior art. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a flowchart of a battery cooling method according to an embodiment of this application; Figure 2 This is a schematic diagram of a thermal management system architecture; Figure 3 This is a flowchart illustrating a cooling strategy determination method according to an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of a battery cooling device according to an embodiment of this application. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] According to an embodiment of this application, a battery cooling method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0024] Figure 1 This is a flowchart of a battery cooling method according to an embodiment of this application, such as... Figure 1 As shown, the method includes the following steps:

[0025] Step S102: Obtain battery thermal management requirements.

[0026] The aforementioned battery thermal management requirements refer to the need to control and manage battery temperature during battery use to ensure battery performance, safety, and lifespan. Types of thermal management requirements include, but are not limited to, cooling, heating, temperature equalization, pre-cooling, and preheating requirements. Specific thermal management requirements need to be determined based on the functional division of the battery system and actual conditions. Battery operating temperature has a significant impact on its performance. Excessively high temperatures can lead to increased internal resistance, capacity decay, shortened cycle life, and may even trigger thermal runaway, causing safety hazards. Conversely, excessively low temperatures will reduce battery charging and discharging efficiency and power output. Battery thermal management is crucial to ensuring battery operation within a suitable temperature range. Therefore, confirming battery thermal management requirements is beneficial for improving the performance and safety of electric vehicles, hybrid vehicles, or other devices that use batteries as their primary energy source.

[0027] In one optional embodiment, the Battery Management System (BMS) collects parameters such as battery temperature, voltage, current, state of charge (SoC), charge / discharge rate, and ambient temperature of the vehicle's operating environment through multiple sensors installed inside and outside the battery pack. The collected data is then analyzed to determine the battery's current thermal management requirements. This allows the BMS to take actions based on these requirements to maintain the battery within a specified temperature range, thereby ensuring battery efficiency, safety, and extended lifespan. The acquisition of these thermal management requirements is dynamic; the system continuously updates the requirements as battery status and environmental conditions change to adapt to different situations.

[0028] Step S104: In response to the thermal management requirement as a cooling requirement, obtain the passive cooling flag, battery inlet water temperature, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature.

[0029] The aforementioned cooling requirement refers to the need for the battery thermal management system to reduce the battery temperature to the target range when the battery temperature exceeds its optimal operating temperature range during battery operation. This cooling requirement is generated based on real-time monitoring of the battery's status and environmental conditions to ensure the battery can continuously operate at a safe and efficient operating temperature.

[0030] The aforementioned passive cooling flag indicates whether the system is in passive cooling mode. Passive cooling refers to non-powered cooling methods such as natural convection, thermal conductivity, or phase change materials, which do not require additional cooling equipment (such as fans or air conditioners). In battery thermal management, the passive cooling flag can be set based on the current battery temperature, ambient temperature, and electric drive system temperature to determine whether natural cooling or system waste heat can be effectively used to regulate the battery temperature under current conditions. When the flag is set to passive cooling, the system will prioritize attempting to reduce the battery temperature through natural cooling to minimize energy consumption and system complexity.

[0031] The aforementioned battery inlet water temperature refers to the temperature of the coolant or water used for battery heat exchange at the inlet of the cooling system. The battery inlet water temperature can be used to determine whether the cooling system is functioning properly.

[0032] The aforementioned target inlet water temperature for the battery refers to the target coolant temperature used to guide the operation of the cooling system. The target inlet water temperature can be set based on the battery's ideal operating temperature range and the temperature limits the system can withstand. By adjusting the coolant temperature to be as close as possible to the target inlet water temperature, the battery's cooling effect can be improved, ensuring the battery operates within an efficient and safe temperature range.

[0033] The ambient temperature mentioned above refers to the temperature of the surrounding environment outside the battery. Battery efficiency and cooling requirements are often closely related to ambient temperature. In high-temperature environments, the cooling needs of the battery are usually more urgent; while in low-temperature environments, heating measures may be necessary. Therefore, ambient temperature is crucial for developing appropriate thermal management strategies.

[0034] The aforementioned electric drive circuit coolant temperature refers to the temperature of the coolant used to cool electric drive components such as the motor and inverter in the vehicle's drive system. Since the electric drive system and battery system may share the same cooling system (for example, using battery coolant as an intermediate medium for heat exchange with the electric drive system's cooling circuit via a heat exchanger), the electric drive circuit coolant temperature also affects the battery cooling strategy. In some cases, the electric drive system temperature can act as an additional cooling or heat source, affecting the coolant temperature and thus indirectly impacting battery temperature control. Monitoring the electric drive circuit coolant temperature allows for a more accurate assessment of the cooling system's capabilities and whether waste heat from the electric drive system can be utilized for thermal management.

[0035] In one alternative embodiment, when the battery's thermal management requirement is cooling, the system checks the status of the "passive cooling flag," a crucial binary flag indicating whether environmental conditions allow the system to employ a more energy-efficient passive cooling method, rather than a more energy-intensive active cooling mechanism. Next, the system collects information on the battery inlet water temperature (the temperature of the coolant before it enters the battery) and the target battery inlet water temperature, the latter being the ideal temperature the thermal management system expects the coolant to reach for optimal cooling. Furthermore, ambient temperature and electric drive circuit water temperature are also important parameters for system evaluation. They provide crucial information about the external environment and the vehicle's electric drive system status, helping the system determine whether ambient conditions or residual heat from the electric drive system can be used to assist cooling, and whether more aggressive cooling measures are needed to address high-temperature challenges. By comprehensively analyzing the passive cooling flag, battery inlet water temperature, target inlet water temperature, ambient temperature, and electric drive circuit water temperature, the thermal management system can intelligently determine the most suitable cooling strategy for the current conditions, effectively controlling battery temperature, ensuring battery performance and safety, and improving energy efficiency. This process reflects the intelligent and adaptive characteristics of the thermal management system, enabling it to flexibly adjust under different operating environments to achieve ideal cooling results.

[0036] Step S106: Determine the battery cooling strategy based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature.

[0037] The aforementioned cooling strategy refers to a series of algorithms and rules employed by the Thermal Management System (TMS) to determine how to effectively control battery temperature and ensure it operates within a suitable temperature range. Cooling strategies can include, but are not limited to, passive cooling and active cooling; the specific strategy must be determined based on the actual needs of the battery. The cooling strategy guides the operation of the TMS, ensuring the battery remains within a suitable temperature range under various operating conditions. A good cooling strategy not only avoids performance degradation and safety risks caused by overheating but also extends battery life and reduces energy consumption of the battery cooling system, thereby improving the overall energy efficiency of the vehicle.

[0038] In one optional embodiment, a battery cooling strategy is determined based on a passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature. The passive cooling flag indicates whether passive cooling is suitable, while the target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature provide the system with specific values ​​for the current thermal management environment. This helps the system assess whether the activation conditions for passive or active cooling are met, thereby making a decision and selecting the most appropriate cooling strategy. This process demonstrates the intelligent thermal management system's precise control over battery temperature and its ability to improve overall vehicle thermal management.

[0039] For example, in an electric vehicle thermal management scenario, assume the current ambient temperature is 22°C, a relatively mild temperature condition. The battery management system detects the current inlet water temperature of the battery at 30°C, while the target inlet water temperature set by the system based on the battery's chemical characteristics and current operating state is 25°C. Simultaneously, the electric drive circuit coolant temperature reading is 23°C, and the passive cooling flag is on, indicating that the environmental conditions allow for a passive cooling strategy. Based on these key parameters, the thermal management system begins to evaluate the cooling strategy. First, it confirms that the passive cooling flag is on, indicating that passive cooling may be a feasible option. Next, the system compares the ambient temperature and the electric drive circuit coolant temperature, finding that both are lower than the target and current inlet water temperatures of the battery. This means that utilizing natural air convection and the lower temperature of the electric drive system can assist in cooling the battery to the target temperature without additional energy consumption. Based on these analyses, the thermal management system decides to adopt a passive cooling strategy. It will control the cooling system's vents to increase the contact area between the battery module and the outside air, while utilizing the lower coolant temperature of the electric drive circuit to transfer this cooling energy to the battery coolant through a heat exchanger, thereby reducing the battery inlet water temperature. Throughout the process, the system continuously monitors the battery's water inlet temperature, ensuring it gradually approaches the target temperature of 25°C, thereby achieving efficient and energy-saving battery temperature management.

[0040] The above process involves a preliminary assessment and selection of cooling strategies based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature. Through such intelligent decision-making, the thermal management system can effectively control battery temperature while improving energy efficiency, ensuring that electric vehicles maintain good battery performance and safe operation under various environmental conditions. The above values ​​are for illustrative purposes only; specific values ​​need to be determined based on actual conditions and are not limited here.

[0041] Step S108: According to the cooling strategy, control the thermal management system to cool the battery.

[0042] In one optional embodiment, after the thermal management system determines the cooling strategy based on key parameters such as the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature, the TMS then coordinates the various components within the system based on the determined cooling strategy (such as passive cooling or active cooling) to ensure that the cooling process is both efficient and energy-saving. By precisely controlling the cooling system, the TMS can intelligently respond to the battery's thermal management needs, effectively preventing the battery from overheating or overcooling, and ensuring the safe and stable operation of the battery and the vehicle.

[0043] In one alternative embodiment, if the cooling strategy is passive cooling, the TMS will adjust the airflow path of the battery cooling system, opening the radiator fins or vents to allow natural convection or utilize the wind force generated by the vehicle during operation to help dissipate heat from the battery. Simultaneously, the system will utilize cooling materials around the battery, such as thermal pads or phase change materials, and the lower water temperature of the electric drive circuit, to assist in cooling the battery through heat exchange. During this process, the TMS will continuously monitor the battery temperature and coolant temperature to ensure that the temperature drops within the target range while avoiding overcooling that could affect battery performance. Conversely, if the cooling strategy is active cooling, the TMS will activate dedicated cooling components, such as cooling pumps, fans, or refrigerant circulation systems. Coolant will be pumped through cooling pipes, accelerating its flow through the battery module to quickly absorb and remove the heat generated by the battery. Simultaneously, the air conditioning system may be activated to cool the coolant entering the battery cooling system, ensuring its temperature reaches the target inlet water temperature of the battery. In active cooling mode, the TMS will dynamically adjust the workload of the cooling components to balance cooling efficiency and energy consumption, avoiding unnecessary energy consumption while ensuring that the battery temperature remains stable within a suitable operating range. Whether through passive or active cooling, the TMS continuously adjusts and improves the execution of cooling strategies based on real-time monitoring data to cope with changes in battery temperature and fluctuations in external environmental conditions. This dynamic control process ensures that the battery receives appropriate temperature management under various operating conditions, which not only improves battery performance and lifespan but also enhances the overall efficiency and driving experience of electric vehicles.

[0044] In this embodiment, firstly, the battery thermal management requirements are acquired; then, when the thermal management requirement is a cooling requirement, the passive cooling flag, battery inlet water temperature, target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature are acquired; then, based on the passive cooling flag, target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature, a battery cooling strategy is determined; finally, based on the cooling strategy, the thermal management system is controlled to cool the battery. This application first acquires the battery thermal management requirements in real time to determine the current thermal management state of the battery and the required operations. When the thermal management requirement is determined to be a cooling requirement, detailed information such as the passive cooling flag, battery inlet water temperature, target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature is further collected. The passive cooling flag can be used to indicate whether the system can utilize natural cooling methods to cool the battery without activating active cooling equipment. Next, based on this information, a cooling strategy suitable for the current battery state is determined. Finally, the thermal management system is controlled to cool the battery according to the selected cooling strategy. This application achieves the technical objective of improving battery cooling efficiency and reducing energy consumption by responding to battery thermal management needs in real time and intelligently selecting the most energy-efficient cooling method based on environmental and system status. It realizes the technical effect of making the battery cooling strategy more refined and intelligent, thereby solving the technical problem of the imperfect battery cooling strategy in the prior art.

[0045] Optionally, determining the battery cooling strategy based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature includes: in response to the passive cooling flag, the ambient temperature, and the electric drive circuit water temperature meeting a first preset condition, setting the passive cooling flag to the passive cooling position, and determining the battery cooling strategy as passive cooling, wherein the first preset condition is that the ambient temperature is less than a first preset temperature threshold and the electric drive circuit water temperature is less than a second preset temperature threshold; wherein the first preset temperature threshold is less than the second preset temperature threshold.

[0046] The aforementioned first preset condition refers to a key evaluation criterion used in the thermal management system (TMS) to determine whether to activate the passive cooling strategy. When the passive cooling flag, ambient temperature, and electric drive circuit water temperature all simultaneously meet this condition, the system will determine to use passive cooling as the battery's cooling strategy. In the first preset condition, the ambient temperature is lower than a first preset temperature threshold, and the electric drive circuit water temperature is lower than a second preset temperature threshold. This first preset condition ensures that, when environmental conditions permit, the more energy-efficient and lower-energy-consumption passive cooling method is prioritized over active cooling, thereby effectively saving energy and improving the overall system operating efficiency while maintaining a suitable battery temperature.

[0047] The aforementioned first preset temperature threshold can refer to a pre-set temperature value, which can be determined based on factors such as the battery's thermal management requirements, battery chemistry, and vehicle operating environment. If the current ambient temperature is lower than this threshold, it indicates that the external environment can provide natural heat dissipation conditions, such as air convection, to help cool the battery; therefore, a passive cooling strategy can be considered. Setting the first preset temperature threshold can be used to assess whether the ambient temperature is low enough to allow the implementation of a passive cooling strategy, helping to avoid activating the active cooling system when no additional cooling equipment is needed, thereby saving energy.

[0048] The aforementioned second preset temperature threshold can refer to a pre-set temperature value. A coolant temperature in the electric drive circuit below this threshold means that the electric drive system's heat dissipation capacity can match the battery's cooling requirements. Through the natural exchange of coolant in the electric drive system, the battery can be effectively cooled without activating the more energy-intensive active cooling components. Setting the second preset temperature threshold helps ensure that the thermal management system can fully utilize the waste heat management capabilities of various vehicle systems, achieving efficient resource utilization. The first preset temperature threshold is lower than the second preset temperature threshold.

[0049] In one optional embodiment, the status of the passive cooling flag is first checked to determine whether passive cooling is suitable. The passive cooling flag indicates whether the current environment and system conditions support passive cooling, i.e., a natural cooling mechanism that does not rely on additional energy consumption. Next, the system collects and analyzes the current ambient temperature and the water temperature of the electric drive circuit. These two parameters are the core basis for determining whether the first preset condition is met. The first preset condition defines the temperature prerequisite for the passive cooling mode to start, i.e., the ambient temperature must be lower than the first preset temperature threshold, and the water temperature of the electric drive circuit must also be lower than the second preset temperature threshold. Importantly, the first preset temperature threshold is set lower than the second preset temperature threshold, reflecting that the applicable conditions for the passive cooling mode are more stringent, requiring simultaneous satisfaction of the temperature requirements of both the external environment and the internal temperature of the electric drive system.

[0050] Specifically, the first preset temperature threshold is a lower temperature value determined by the thermal management system based on the battery's chemical characteristics, operating status, and environmental conditions. It ensures that when the ambient temperature is below this value, external conditions are conducive to natural battery heat dissipation. Simultaneously, the second preset temperature threshold sets an upper limit for the electric drive circuit coolant temperature. Only when the electric drive circuit coolant temperature is also below this upper limit can the system consider the current cooling conditions sufficiently safe and effective, preventing residual heat from the electric drive system from affecting battery heat dissipation. If the passive cooling flag is currently in the allowed state, and both the ambient temperature and the electric drive circuit coolant temperature meet the first preset condition, the thermal management system will confirm this flag and set it to the passive cooling position, thus determining the battery cooling strategy as passive cooling. This means the system will utilize natural convection, the air cooling effect during vehicle operation, and the heat exchange capacity of the electric drive circuit at lower coolant temperatures to assist in battery cooling without activating the air conditioner or other active cooling equipment, thereby saving energy and improving cooling efficiency. This decision-making process reflects the thermal management system's precise judgment and strategy improvement in battery temperature control, ensuring that passive cooling is prioritized under suitable conditions to achieve better energy efficiency and battery operating status.

[0051] Optionally, determining the battery cooling strategy based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature includes: in response to the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature meeting a second preset condition, setting the passive cooling flag to the passive cooling position, and determining the battery cooling strategy as passive cooling. The second preset condition is that the ambient temperature is greater than or equal to a first preset temperature threshold and less than a third preset temperature threshold, the difference between the target inlet water temperature and the ambient temperature is greater than the third preset temperature threshold, and the electric drive circuit water temperature is less than the second preset temperature threshold; wherein, the first preset temperature threshold is less than the third preset temperature threshold, and the third preset temperature threshold is less than the second preset temperature threshold.

[0052] The aforementioned second preset condition refers to another set of evaluation criteria used in the thermal management system to determine whether a passive cooling strategy can be safely and effectively employed on a battery under specific temperature conditions. Compared to the first preset condition, the second preset condition is applicable to situations where the ambient temperature is relatively high, but there is still some potential for natural cooling. Specifically, when the ambient temperature is between the first and third preset temperature thresholds, and the difference between the target battery inlet water temperature and the ambient temperature exceeds the third preset temperature threshold, while the electric drive circuit water temperature is lower than the second preset temperature threshold, the system will determine that the second preset condition is met. This means that even if the ambient temperature is not particularly low, if the target battery inlet water temperature is much lower than the current ambient temperature, and the electric drive circuit water temperature is low, the passive cooling strategy may still be feasible and can be activated to achieve the battery's temperature management target.

[0053] The aforementioned third preset temperature threshold can be considered an upper limit temperature standard for the thermal management system when evaluating the applicability of passive cooling. This third preset temperature threshold is higher than the first preset temperature threshold but lower than the second preset temperature threshold. This setting ensures that even under relatively mild ambient temperatures (i.e., ambient temperatures greater than or equal to the first preset temperature threshold but less than the third preset temperature threshold), passive cooling remains an effective option if the difference between the target battery inlet temperature and the ambient temperature is sufficiently large. The introduction of the third preset temperature threshold allows the thermal management system to more flexibly activate passive cooling strategies under different temperature conditions and battery temperature requirements, thereby improving battery temperature management in a wider range of operating environments and enhancing the energy efficiency and driving performance of electric vehicles.

[0054] The aforementioned second preset temperature threshold can refer to a pre-set upper limit for the electric drive circuit water temperature. This threshold ensures that, when employing a passive cooling strategy, the temperature of the electric drive system will not negatively impact the battery's cooling effect. When the electric drive circuit water temperature is below this threshold, it means that the waste heat of the electric drive system can be utilized to help cool the battery through heat exchange without increasing the battery's thermal load. The second preset temperature threshold is typically higher than the first and third preset temperature thresholds, reflecting the system's tolerance to the electric drive circuit water temperature, thus ensuring that the passive cooling strategy is not constrained by the electric drive system's temperature state during implementation.

[0055] In one optional embodiment, when the system faces a high ambient temperature but still wants to use a passive cooling strategy, the current state of the system is judged based on a second preset condition. If the current state of the system meets the second preset condition, it means that the thermal management system makes a fine judgment in a specific and complex temperature environment to determine the appropriate timing and effectiveness of the passive cooling strategy.

[0056] Specifically, when the passive cooling flag is enabled, the ambient temperature exceeds the first preset temperature threshold, which typically indicates that the external environment is no longer extremely cold but rather in a relatively mild temperature range. However, the ambient temperature must still be below the third preset temperature threshold, a broader upper limit of the temperature range, indicating that the external environment has not yet reached a point where the energy-intensive active cooling mode needs to be activated immediately. Simultaneously, the difference between the battery's target inlet water temperature and the current ambient temperature must be greater than the third preset temperature threshold, reflecting that even in warmer environments, the battery module still has significant cooling requirements, and the passive cooling strategy still has potential value in this situation. Meanwhile, the electric drive circuit coolant temperature needs to be below the second preset temperature threshold—the highest of all preset temperature thresholds. This indicates that despite a rise in ambient temperature, the coolant temperature of the electric drive system remains at a low level, serving as an effective medium for passive cooling, further reducing the battery temperature through heat exchange without placing additional thermal burden on the battery.

[0057] In summary, when all these complex and interrelated conditions—namely, the passive cooling flag being on, the ambient temperature being between the first and third preset temperature thresholds, a significant temperature difference between the target battery inlet water temperature and the ambient temperature, and the low temperature of the electric drive circuit water—are simultaneously met, the thermal management system will determine that the second preset condition is met, thereby setting the passive cooling flag to the passive cooling position and determining the battery cooling strategy as passive cooling. This strategy not only considers the battery's immediate cooling needs but also assesses the external environment and the electric drive system status, thus improving energy efficiency and reducing the frequent activation of active cooling while ensuring effective battery temperature management.

[0058] Optionally, the method further includes: in response to the passive cooling flag bit, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature not meeting any of the first preset condition and the second preset condition, setting the passive cooling flag bit to the non-passive cooling bit, and determining the battery cooling strategy as active cooling.

[0059] The aforementioned non-passive cooling setting refers to a flag triggered by the system after evaluation, indicating that the current environmental conditions or battery status are unsuitable for passive, natural cooling. Specifically, when key parameters such as ambient temperature, the difference between the target battery inlet water temperature and the ambient temperature, and the electric drive circuit water temperature do not meet any of the pre-set first or second preset conditions, the non-passive cooling setting will be triggered, prompting the thermal management system to switch to a more proactive cooling strategy.

[0060] Active cooling, as described above, refers to a series of cooling measures taken by the thermal management system when the battery requires cooling, but environmental conditions or system status do not support passive cooling. Unlike passive cooling, which relies on natural heat dissipation, active cooling artificially creates a cooling environment by activating devices such as air conditioning systems, water pump-driven liquid circulation cooling systems, or electronic cooling chips, accelerating the transfer of heat from the battery module to the outside environment. Active cooling is typically activated in response to situations such as excessively high battery temperatures, ambient temperatures unsuitable for natural heat dissipation, or insufficient coolant temperature in the electric drive system. Types of active cooling can include, but are not limited to, utilizing air conditioning cooling systems, liquid cooling circulation, and electronic cooling chips; the specific active cooling method must be determined based on the thermal management system design and actual needs. Active cooling can be used to quickly reduce battery temperature, protect the battery from overheating, extend battery life, and ensure the safe and efficient operation of the vehicle.

[0061] In one optional embodiment, when the thermal management system detects that the passive cooling flag is activated, and the target battery inlet water temperature, current ambient temperature, and electric drive circuit water temperature do not meet any of the predetermined first and second preset conditions, it means that natural heat dissipation or environmentally assisted cooling can no longer effectively meet the battery's temperature control requirements. At this time, the thermal management system will immediately adjust its cooling strategy by setting the passive cooling flag to the non-passive cooling position, explicitly instructing the system to switch from passive cooling mode to active cooling mode. This switching of cooling strategy ensures that the thermal management system can flexibly respond and take proactive intervention measures when environmental conditions change or battery temperature management requirements increase, preventing battery damage due to overheating while ensuring the electric vehicle's power performance and user safety.

[0062] In one optional embodiment, the thermal management system intelligently switches to active cooling mode based on specific operating conditions and battery status when determining the battery cooling strategy. The system considers factors including, but not limited to, battery charge / discharge rate, vehicle load, and driving speed to determine which type of active cooling method is most suitable for the current situation. For example, in high-temperature summer conditions, the air conditioning cooling system may be prioritized to quickly reduce battery temperature when the vehicle is stationary; while at high speeds, liquid cooling circulation may be preferred to cope with continuously generated waste heat. Electronic cooling chips are typically standard equipment in high-end vehicles, providing additional temperature control precision, especially demonstrating excellent performance in scenarios requiring short-term, efficient cooling. In short, the setting of the non-passive cooling position triggers the activation of the active cooling strategy. This strategy selection is based on real-time monitoring of battery and ambient temperatures, as well as consideration of the advantages of different cooling methods. Active cooling achieves proactive control of battery temperature through various means, ensuring that the battery of the electric vehicle can maintain a safe and ideal temperature range under a wide range of operating conditions and ambient temperatures, thereby guaranteeing vehicle performance and driving experience.

[0063] Optionally, the method further includes: obtaining the battery inlet water temperature during the passive cooling phase; in response to the battery inlet water temperature and the target battery inlet water temperature meeting a third preset condition, setting the passive cooling flag to a non-passive cooling position, and determining that the battery cooling strategy is active cooling, wherein the third preset condition is that the difference between the battery inlet water temperature and the target battery inlet water temperature is greater than a preset difference and the duration is greater than a preset duration; or, in response to the battery inlet water temperature and the target battery inlet water temperature not meeting the third preset condition, setting the passive cooling flag to a passive cooling position, and determining that the battery cooling strategy is passive cooling.

[0064] The aforementioned battery inlet water temperature refers to the temperature of the coolant before it enters the battery cooling system. During passive cooling, the battery inlet water temperature reflects the coolant temperature under natural conditions. When the system detects that the battery inlet water temperature begins to deviate significantly from the target battery inlet water temperature, it indicates that passive cooling may be insufficient to maintain the battery within its ideal operating temperature range, and it is necessary to assess whether active cooling should be initiated.

[0065] The aforementioned third preset condition refers to the decision-making basis used by the thermal management system to determine whether the passive cooling effect has met expectations and whether to switch to active cooling. The third preset condition is set when the difference between the battery inlet water temperature and the target inlet water temperature is greater than a preset difference, and this state persists for a longer than a preset duration. This third preset condition ensures that the thermal management system can accurately identify the efficiency decline of the passive cooling strategy, thereby enabling timely and more effective active cooling measures.

[0066] The aforementioned preset difference refers to a threshold set to monitor the difference between the battery inlet water temperature and the target inlet water temperature. The preset difference may include, but is not limited to, 2°C, 3°C, 4°C, 5°C, etc. The specific preset difference needs to be set according to the battery type and the efficiency of the cooling system, and is not limited here. The preset difference helps the system determine whether the current passive cooling strategy is still effective and when it is necessary to switch from passive cooling to active cooling. When the difference between the battery inlet water temperature and the target inlet water temperature exceeds the preset difference, it means that passive cooling cannot reduce the battery inlet water temperature to the target level. Battery temperature control becomes urgent, and the system must take more active cooling measures to prevent the battery from overheating and ensure battery performance and safety.

[0067] The aforementioned duration refers to the time during which the difference between the battery inlet water temperature and the target inlet water temperature exceeds a preset difference value. This duration helps prevent the system from frequently activating active cooling during temperature fluctuations, as momentary temperature fluctuations may not necessarily indicate the need for continuous, powerful cooling. Only when the temperature difference exceeds the preset value and persists for a certain period does the system confirm that the passive cooling strategy is no longer effective, thus triggering a switch to active cooling. Properly setting the duration has a significant impact on reducing energy consumption, extending system lifespan, and maintaining battery temperature stability.

[0068] The aforementioned preset duration refers to the time threshold used by the thermal management system to determine when to switch from passive cooling to active cooling. The preset duration may include, but is not limited to, 1 minute, 2 minutes, 3 minutes, etc. The specific preset duration needs to be set according to the rate of environmental change during the passive cooling phase and the thermal inertia of the battery; no limitation is made here. The preset duration specifies the length of time the temperature difference between the battery inlet water temperature and the target inlet water temperature is maintained at least above a preset value. The preset duration can be used to ensure that the system does not mistakenly activate high-energy-consuming active cooling due to brief temperature fluctuations, but instead waits until the persistent temperature difference is confirmed before taking active measures, thereby finding a balance between efficiency and safety.

[0069] In one optional embodiment, during the passive cooling phase, the battery inlet water temperature is periodically measured and acquired. When the battery inlet water temperature and the target inlet water temperature are detected to meet a third preset condition—that is, when the difference between the battery inlet water temperature and the target inlet water temperature is greater than a preset difference, and this deviation lasts for more than a preset duration—the system determines that passive cooling is insufficient to achieve ideal battery temperature control. At this point, the passive cooling flag is changed to a non-passive cooling flag, triggering the activation of the active cooling strategy. The active cooling strategy directly intervenes in the battery temperature through more powerful cooling methods, such as enhanced liquid circulation or direct air conditioning cooling, to quickly reduce the battery temperature to the target set value, preventing performance degradation or safety issues caused by battery overheating. Conversely, if during the cooling process, the battery inlet water temperature and the target inlet water temperature do not meet the third preset condition—that is, the difference between the battery inlet water temperature and the target inlet water temperature does not continuously expand to exceed the preset difference, or even if it exceeds it but the duration is less than the preset value—this indicates that passive cooling can still effectively manage the battery temperature and achieve the expected cooling effect. In this situation, the system will maintain the passive cooling flag in the passive cooling position and continue using the passive cooling strategy. This ensures battery temperature control while avoiding unnecessary energy consumption, improving the efficiency and economy of the thermal management system. In summary, by continuously monitoring the battery inlet water temperature and dynamically adjusting the state of the passive cooling flag, the thermal management system can intelligently switch between passive cooling and active cooling. This ensures that the battery temperature control strategy can both actively respond to sudden thermal management needs and maintain economical and efficient operation under normal conditions, demonstrating the adaptability and intelligence of the thermal management system in battery temperature management.

[0070] Optionally, the method further includes: in response to thermal management requirements rather than cooling requirements, setting the passive cooling flag to the non-passive cooling position.

[0071] In one optional embodiment, a comprehensive analysis is first performed based on the battery's temperature state and the vehicle's overall operating conditions, such as battery charging / discharging status, vehicle speed, and ambient temperature. If the analysis indicates that the battery temperature is stable or effectively managed through passive methods such as natural environmental cooling without the need for additional cooling intervention—meaning thermal management requires more than cooling—then the system sets the passive cooling flag to the non-passive cooling flag. This effectively disables the passive cooling mode, indicating that the system currently requires no special cooling strategy. Through this mechanism, the thermal management system can flexibly adapt to changes in battery temperature. When the battery requires cooling, it can quickly activate passive or active cooling strategies; conversely, when the battery temperature is normal and no additional cooling is needed, it can promptly stop cooling operations, achieving a dynamic balance in battery temperature management.

[0072] In one alternative embodiment, Figure 2This is a schematic diagram of a thermal management system architecture, such as... Figure 2 As shown in the diagram, the system includes: a refrigerator, a compressor, an electronic expansion valve, a normally closed expansion valve, a first water pump, a second water pump, a first water tank, a second water tank, a first radiator, a second radiator, a first fan, a second fan, a first three-way proportional valve, a second three-way proportional valve, a water heater, a battery, an electric drive system, a first multi-way valve, a second multi-way valve, a first temperature sensor, a second temperature sensor, a first air pressure sensor, and a second air pressure sensor. These components are connected by a carefully designed piping network to form a complete refrigeration and water circulation system. The system can intelligently adjust its cooling strategy, including passive and active cooling, based on real-time monitored temperature and pressure data, to ensure that the battery and electric drive system remain within their ideal operating temperature range under various operating conditions, thereby improving overall performance and safety.

[0073] In one alternative embodiment, Figure 3 This is a flowchart illustrating a cooling strategy determination method according to an embodiment of this application, such as... Figure 3 As shown, when the battery cooling method begins, it first determines whether the battery requires cooling. If there is no cooling requirement, the passive cooling flag is set to 0, indicating that passive cooling is not currently used, and the determination process ends directly. If there is a cooling requirement, the passive cooling flag status from the previous cycle, the current battery inlet water temperature T1, the target battery inlet water temperature T2, the ambient temperature T0, and the electric drive circuit water temperature T3 are obtained. Next, it is determined whether the above information meets the following conditions: the ambient temperature T0 is less than 0°C, or the ambient temperature T0 is between 0°C and 10°C, and the difference between the target battery inlet water temperature T2 and the ambient temperature T0 is greater than 10°C, while the electric drive circuit water temperature T3 is less than 25°C. If the above conditions are not met, the passive cooling flag is set to 0, and the system maintains active cooling mode. If the above conditions are met, the process will set the passive cooling flag to 1, indicating that the passive cooling strategy is enabled. It will then further determine whether the difference between the battery inlet water temperature T1 and the target inlet water temperature T2 exceeds 5°C, and whether this state has persisted for more than 5 minutes. If these conditions are met, the process will set the passive cooling flag to 0, indicating that the passive cooling effect is insufficient, and the system needs to switch to an active cooling strategy. If these conditions are not met, the passive cooling flag will be set to 1, and passive cooling will continue. This process demonstrates the system's intelligent selection and dynamic adjustment of the cooling strategy, ensuring the flexibility and efficiency of battery temperature control. The values ​​above are for illustrative purposes only; specific values ​​need to be determined based on system design and actual requirements, and are not limited here.

[0074] According to another aspect of the embodiments of this application, a battery cooling system is also provided, comprising: a first acquisition module for acquiring battery thermal management requirements; a second acquisition module for acquiring a passive cooling flag, battery inlet water temperature, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature in response to the thermal management requirements; a determination module for determining a battery cooling strategy based on the passive cooling flag, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature; and a control module for controlling the thermal management system to cool the battery according to the cooling strategy.

[0075] According to an embodiment of this application, a battery cooling device is provided. It should be noted that this device can be used to perform the battery cooling method described above. The specific implementation method and preferred application scenarios are the same as those in the above embodiment, and will not be repeated here.

[0076] Figure 4 This is a schematic diagram of a battery cooling device according to an embodiment of this application, such as... Figure 4 As shown, the device includes: a first acquisition module 402, a second acquisition module 404, a determination module 406, and a control module 408.

[0077] Optionally, the determining module is configured to set the passive cooling flag to the passive cooling position and determine the battery cooling strategy as passive cooling in response to the passive cooling flag bit, ambient temperature and electric drive circuit water temperature meeting a first preset condition. The first preset condition is that the ambient temperature is less than a first preset temperature threshold and the electric drive circuit water temperature is less than a second preset temperature threshold; wherein the first preset temperature threshold is less than the second preset temperature threshold.

[0078] Optionally, the determining module is further configured to, in response to the passive cooling flag bit, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature meeting the second preset condition, set the passive cooling flag bit to the passive cooling bit, determine the battery cooling strategy as passive cooling, and the second preset condition is that the ambient temperature is greater than or equal to the first preset temperature threshold and less than the third preset temperature threshold, the difference between the target inlet water temperature and the ambient temperature is greater than the third preset temperature threshold, and the electric drive circuit water temperature is less than the second preset temperature threshold; wherein, the first preset temperature threshold is less than the third preset temperature threshold, and the third preset temperature threshold is less than the second preset temperature threshold.

[0079] Optionally, the device is also configured to, in response to any one of the following conditions—passive cooling flag, target battery inlet water temperature, ambient temperature, and electric drive circuit water temperature—not meeting the first preset condition and the second preset condition, set the passive cooling flag to the non-passive cooling position and determine that the battery cooling strategy is active cooling.

[0080] Optionally, the device is further configured to acquire the battery inlet water temperature during the passive cooling phase; in response to the battery inlet water temperature and the target battery inlet water temperature meeting a third preset condition, the passive cooling flag is set to the non-passive cooling position, and the battery cooling strategy is determined to be active cooling, wherein the third preset condition is that the difference between the battery inlet water temperature and the target battery inlet water temperature is greater than a preset difference and the duration is greater than a preset duration; or, in response to the battery inlet water temperature and the target battery inlet water temperature not meeting the third preset condition, the passive cooling flag is set to the passive cooling position, and the battery cooling strategy is determined to be passive cooling.

[0081] Optionally, the device is also used to set the passive cooling flag to the non-passive cooling position in response to thermal management requirements rather than cooling requirements.

[0082] Embodiments of this application also provide an electronic device, including: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods in various embodiments of this application when it runs.

[0083] Embodiments of this application also provide a computer-readable storage medium including a stored executable program, wherein, when the executable program is running, it controls the device where the computer-readable storage medium is located to perform the methods of various embodiments of this application.

[0084] Embodiments of this application also provide a computer program product, including a computer program that, when executed by a processor, implements the methods of various embodiments of this application.

[0085] Embodiments of this application also provide a computer program product, including a non-volatile computer-readable storage medium for storing a computer program that, when executed by a processor, implements the methods in various embodiments of this application.

[0086] Embodiments of this application also provide a computer program that, when executed by a processor, implements the methods described in the various embodiments of this application.

[0087] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0089] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0090] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0091] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0092] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery cooling method, characterized in that, include: Obtain battery thermal management requirements; In response to the thermal management requirement being a cooling requirement, the passive cooling flag, battery inlet water temperature, battery target inlet water temperature, ambient temperature, and electric drive circuit water temperature are obtained. The cooling strategy for the battery is determined based on the passive cooling flag, the target inlet water temperature of the battery, the ambient temperature, and the water temperature of the electric drive circuit. According to the cooling strategy, the thermal management system is controlled to cool the battery.

2. The battery cooling method according to claim 1, characterized in that, The step of determining the battery cooling strategy based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature includes: In response to the passive cooling flag, the ambient temperature and the electric drive circuit water temperature meeting the first preset condition, the passive cooling flag is set to the passive cooling position, and the battery cooling strategy is determined to be passive cooling. The first preset condition is that the ambient temperature is less than the first preset temperature threshold and the electric drive circuit water temperature is less than the second preset temperature threshold. Wherein, the first preset temperature threshold is less than the second preset temperature threshold.

3. The battery cooling method according to claim 2, characterized in that, The step of determining the battery cooling strategy based on the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature includes: In response to the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature meeting the second preset condition, the passive cooling flag is set to the passive cooling position, and the battery cooling strategy is determined to be passive cooling. The second preset condition is that the ambient temperature is greater than or equal to the first preset temperature threshold and less than the third preset temperature threshold, the difference between the target inlet water temperature and the ambient temperature is greater than the third preset temperature threshold, and the electric drive circuit water temperature is less than the second preset temperature threshold. Wherein, the first preset temperature threshold is less than the third preset temperature threshold, and the third preset temperature threshold is less than the second preset temperature threshold.

4. The battery cooling method according to claim 3, characterized in that, Also includes: In response to any of the following conditions not being met: the passive cooling flag, the target battery inlet water temperature, the ambient temperature, and the electric drive circuit water temperature, the passive cooling flag is set to the non-passive cooling position, and the battery cooling strategy is determined to be active cooling.

5. The battery cooling method according to claim 1, characterized in that, Also includes: Obtain the battery inlet water temperature during the passive cooling phase; In response to the battery inlet water temperature and the battery target inlet water temperature meeting a third preset condition, the passive cooling flag is set to a non-passive cooling position, and the battery cooling strategy is determined to be active cooling. The third preset condition is that the difference between the battery inlet water temperature and the battery target inlet water temperature is greater than a preset difference and the duration is greater than a preset duration. or, In response to the fact that the battery inlet water temperature and the battery target inlet water temperature do not meet the third preset condition, the passive cooling flag is set to the passive cooling position, and the battery cooling strategy is determined to be passive cooling.

6. The battery cooling method according to claim 1, characterized in that, Also includes: In response to the thermal management requirement being non-cooling requirement, the passive cooling flag is set to the non-passive cooling position.

7. A battery cooling system, characterized in that, include: The first acquisition module is used to acquire battery thermal management requirements; The second acquisition module is used to acquire the passive cooling flag, battery inlet water temperature, battery target inlet water temperature, ambient temperature and electric drive circuit water temperature in response to the thermal management requirement being a cooling requirement. The determination module is used to determine the cooling strategy of the battery based on the passive cooling flag, the target inlet water temperature of the battery, the ambient temperature, and the water temperature of the electric drive circuit. The control module is used to control the thermal management system to cool the battery according to the cooling strategy.

8. A vehicle, characterized in that, include: Memory, which stores executable programs; A processor for running the program, wherein the program, when running, performs the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored executable program, wherein, when the executable program is executed, it controls the device on which the storage medium is located to perform the method according to any one of claims 1 to 6.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method according to any one of claims 1 to 6.

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