A power battery thermal management method, device, equipment and storage medium

Abstract

This application discloses a method, apparatus, device, and storage medium for thermal management of a power battery. The solution involves acquiring a smart charging signal. Based on the smart charging signal, it is determined whether the vehicle is in a smart charging state. If the vehicle is in a smart charging state, the available power value of the power battery and the power value required by the DC-DC converter are acquired. The start / stop of the thermal management function is controlled based on the comparison result between the difference between the available power value of the power battery and the power value required by the DC-DC converter and a first preset threshold. This application's technical solution dynamically correlates the smart charging state with the power demand of the DC-DC converter, flexibly adjusting the thermal management strategy according to the actual power difference. By combining the smart charging signal, the power value required by the DC-DC converter, and battery status parameters in real time, the thermal management start / stop logic is dynamically optimized, significantly reducing energy loss and improving overall vehicle energy efficiency while ensuring battery safety.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, and in particular to a method, device, equipment and storage medium for thermal management of power batteries. Background Technology

[0002] With the rapid development of new energy vehicles, thermal management technology for power batteries has become a key factor in ensuring vehicle performance, safety, and energy efficiency. Currently, intelligent charging functions are widely used in new energy vehicles, replenishing the vehicle's low-voltage system with electricity as needed through the power battery to solve the problem of power depletion during long-term parking or in low-temperature environments.

[0003] However, in existing technologies, the thermal management strategy for power batteries in intelligent charging scenarios still follows the conventional driving thermal management process. For example, cooling is activated when the battery temperature is above a certain threshold (such as 35°C), and heating is activated when it is below another threshold (such as 0°C). Although this one-size-fits-all management approach can maintain the basic operating temperature of the battery, it ignores the special characteristics of intelligent charging scenarios. It not only consumes additional power battery energy, but may also exacerbate energy loss due to frequent start-stop cycles. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a power battery thermal management method, apparatus, device, and storage medium. The aim is to optimize the thermal management start-stop logic of the power battery in intelligent charging scenarios, thereby significantly reducing energy loss and improving the overall vehicle energy efficiency while ensuring battery safety.

[0005] The embodiments of this application disclose the following technical solutions:

[0006] The first aspect of this application provides a thermal management method for a power battery, the method comprising:

[0007] Obtain intelligent power replenishment signals;

[0008] Based on the intelligent charging signal, determine whether the vehicle is in intelligent charging state;

[0009] If the vehicle is in intelligent charging mode, it can obtain the power value that the power battery can release and the power value required by the DC-DC converter.

[0010] The start and stop of the thermal management function are controlled based on the comparison between the difference between the power value that the power battery can release and the power value required by the DC-DC converter and a first preset threshold.

[0011] In an optional implementation, controlling the start / stop of the thermal management function based on a comparison between the difference between the power value that can be released by the power battery and the power value required by the DC-DC converter and a first preset threshold includes:

[0012] If the difference is greater than a first preset threshold, the thermal management function is disabled.

[0013] If the difference is less than or equal to the first preset threshold, the temperature of the power battery is obtained, and the start / stop of the thermal management function is controlled according to the temperature of the power battery.

[0014] In an optional implementation, controlling the start / stop of the thermal management function based on the temperature of the power battery includes:

[0015] When the temperature of the power battery exceeds the preset temperature range, the thermal management function is activated.

[0016] In an optional implementation, activating the thermal management function when the temperature of the power battery exceeds a preset temperature range includes:

[0017] When the temperature of the power battery is lower than the lowest temperature within the preset temperature range, the heating function is activated;

[0018] When the temperature of the power battery is higher than the highest temperature in the preset temperature range, the cooling function is activated.

[0019] In an optional implementation, after the thermal management function is activated, the power battery thermal management method further includes:

[0020] When the temperature of the power battery changes more than the initial temperature when the thermal management function is activated, the thermal management function is stopped.

[0021] In an optional implementation, the power value that the power battery can release is determined based on the real-time temperature and state of charge of the power battery.

[0022] In an optional implementation, determining whether the vehicle is in intelligent charging mode based on the intelligent charging signal includes:

[0023] If the intelligent charging signal is a high-voltage signal, then the vehicle is determined to be in intelligent charging state;

[0024] If the intelligent charging signal is a low-voltage signal, then the vehicle is determined not to be in intelligent charging mode.

[0025] A second aspect of this application provides a power battery thermal management device, the device comprising:

[0026] The first acquisition module is used to acquire intelligent power replenishment signals;

[0027] The judgment module is used to determine whether the vehicle is in intelligent charging state based on the intelligent charging signal;

[0028] The second acquisition module is used to acquire the power value that the power battery can release and the power value required by the DC-DC converter if the vehicle is in intelligent charging state.

[0029] The control module is used to control the start and stop of the thermal management function based on the comparison result of the difference between the power value that the power battery can release and the power value required by the DC-DC converter and a first preset threshold.

[0030] A third aspect of this application provides a power battery thermal management device, which includes: a processor and a memory.

[0031] The memory is used to store program code and transmit the program code to the processor;

[0032] The processor is used to execute the steps of the power battery thermal management method described in any implementation of the first aspect according to the instructions in the program code.

[0033] A fourth aspect of this application provides a computer-readable storage medium for storing program code for performing the steps of the power battery thermal management method described in any implementation of the first aspect.

[0034] Compared with the prior art, this application has the following advantages:

[0035] In this application's technical solution, a smart charging signal is first acquired; then, based on the smart charging signal, it is determined whether the vehicle is in a smart charging state; if the vehicle is in a smart charging state, the available power value of the power battery and the power value required by the DC-DC converter are acquired; finally, based on the comparison result of the difference between the available power value of the power battery and the power value required by the DC-DC converter and a first preset threshold, the start / stop of the thermal management function is controlled. It can be seen that in this application's technical solution, the smart charging state is dynamically correlated with the power demand of the DC-DC converter, and the thermal management strategy is flexibly adjusted according to the actual power difference. By combining the smart charging signal, the power value required by the DC-DC converter, and battery status parameters in real time, the start / stop logic of the power battery thermal management is dynamically optimized, thereby significantly reducing energy loss and improving the overall vehicle energy efficiency while ensuring battery safety. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart of a power battery thermal management method provided in this application embodiment;

[0038] Figure 2A flowchart of another power battery thermal management method provided in this application embodiment;

[0039] Figure 3 This is a partial flowchart of a power battery thermal management method provided in an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the structure of a power battery thermal management device provided in an embodiment of this application. Detailed Implementation

[0041] As described earlier, current thermal management strategies for power batteries in intelligent charging scenarios still follow the conventional driving thermal management process. For example, cooling is activated when the battery temperature exceeds a certain threshold (e.g., 35°C), and heating is activated when it falls below another threshold (e.g., 0°C). While this one-size-fits-all management approach can maintain the battery's basic operating temperature, it ignores the special characteristics of intelligent charging scenarios. This not only consumes additional power battery energy but may also exacerbate energy loss due to frequent start-stop cycles, resulting in significant drawbacks such as low energy utilization and rigid control logic.

[0042] The inventors have proposed a method, device, equipment, and storage medium for thermal management of power batteries.

[0043] First, an intelligent charging signal is acquired. Then, based on the intelligent charging signal, it is determined whether the vehicle is in intelligent charging mode. If the vehicle is in intelligent charging mode, the available power value of the power battery and the power value required by the DC-DC converter are acquired. Finally, based on the comparison between the difference between the available power value of the power battery and the power value required by the DC-DC converter and a first preset threshold, the start / stop of the thermal management function is controlled. It can be seen that in this application's technical solution, the intelligent charging state is dynamically correlated with the power demand of the DC-DC converter, and the thermal management strategy is flexibly adjusted according to the actual power difference. By combining the intelligent charging signal, the power value required by the DC-DC converter, and battery status parameters in real time, the thermal management start / stop logic is dynamically optimized, thereby significantly reducing energy loss and improving overall vehicle energy efficiency while ensuring battery safety.

[0044] 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 are within the scope of protection of the present application.

[0045] See Figure 1 This figure is a flowchart of a power battery thermal management method provided in an embodiment of this application. Figure 1 As shown, the method includes the following steps:

[0046] S101, Obtain intelligent power replenishment signal.

[0047] Intelligent charging is a dynamic power replenishment mechanism, mainly used to automatically replenish the power of the vehicle's low-voltage electrical system (such as a 12V small battery) through the power battery (high-voltage battery) when the vehicle is not in motion.

[0048] The intelligent charging signal is a specific electrical signal used in new energy vehicles to trigger and control the intelligent charging function. It is generated by the vehicle communication terminal (vehicle T-BOX, Telematics BOX).

[0049] In this embodiment of the application, the vehicle's intelligent charging signal generated by the on-board T-BOX can be obtained through the vehicle's battery management system (BMS) to determine whether the vehicle is in an intelligent charging state.

[0050] S102. Determine whether the vehicle is in intelligent charging state based on the intelligent charging signal.

[0051] In this embodiment of the application, based on the type of intelligent charging signal obtained in the aforementioned steps, it can be determined whether the vehicle is currently in intelligent charging state.

[0052] The type of intelligent power replenishment signal may be either an upper high voltage signal or a lower high voltage signal.

[0053] In one optional implementation, the step of determining whether the vehicle is in an intelligent charging state based on the intelligent charging signal specifically includes:

[0054] If the intelligent charging signal is an upper high-voltage signal, the vehicle is determined to be in intelligent charging mode; if the intelligent charging signal is a lower high-voltage signal, the vehicle is determined not to be in intelligent charging mode.

[0055] In this embodiment of the application, when the voltage of the vehicle's small battery is lower than a set threshold (such as 11.8V), the vehicle's T-BOX generates a high-voltage signal to trigger the intelligent charging process of the power battery, at which time the vehicle is in an intelligent charging state.

[0056] When the small battery voltage returns to a safe range (e.g., 12.6V) or the user manually terminates the charging, the TBOX sends a high-voltage signal to exit the charging mode. At this time, the vehicle is not in intelligent charging mode.

[0057] S103. If the vehicle is in intelligent charging mode, obtain the power value that the power battery can release and the power value required by the DC-DC converter.

[0058] A power battery is a high-voltage battery pack (usually a lithium-ion battery) that provides driving energy for new energy vehicles. Its voltage range is between 300V and 800V, and it is the core power source of the vehicle.

[0059] The power output value of a power battery refers to the maximum power that a power battery can safely output under specific operating conditions (such as current temperature, SOC, and SOH).

[0060] A DC-DC converter is a power electronic device used to convert high-voltage DC power (such as 400V) from a power battery into low-voltage DC power (such as 12V or 48V) to power the vehicle's low-voltage systems (small batteries, lights, entertainment systems, etc.).

[0061] The power required by a DC-DC converter is the actual power demanded by the converter, determined by the load of the low-voltage system. For example, the charging power of a small battery during smart charging.

[0062] In this embodiment, as the small battery's power is restored, the charging current gradually decreases, and the power required by the DC-DC converter decreases accordingly.

[0063] In this embodiment of the application, if it is determined in the previous step that the vehicle is in a smart charging state, the power value that the power battery can release and the power value required by the DC-DC converter are obtained in order to analyze the degree of matching between the power battery output capability and the actual needs of the DC-DC converter, and then dynamically optimize the start-stop logic of the power battery thermal management function to reduce unnecessary energy waste.

[0064] In one alternative implementation, the power that the battery can release is determined based on the battery's real-time temperature and state of charge.

[0065] S104. Based on the comparison result of the difference between the power value that the power battery can release and the power value required by the DC-DC converter and the first preset threshold, control the start and stop of the thermal management function.

[0066] In one example implementation, the power that the battery can release is represented as P. release The power required by a DC-DC converter is expressed as P. DCDC The difference between the power output of the battery and the power required by the DC-DC converter is expressed as ΔP. ​​Specifically,

[0067] △P=P release -P DCDC .

[0068] In this embodiment of the application, the first preset threshold is represented as A, which is calibrated by the vehicle manufacturer according to actual needs (such as battery capacity), such as 5kW.

[0069] In this embodiment of the application, the difference between the power value that the power battery can release and the power value required by the DC-DC converter obtained in the aforementioned steps is calculated. The difference between the two represents the degree of matching between the intelligent power replenishment demand and the power battery capability.

[0070] In this embodiment, if the difference ΔP between the power output of the battery and the power required by the DC-DC converter is large, meaning the demand of the DC-DC converter is much lower than the capacity of the battery, it indicates that the intelligent power replenishment task can be completed quickly without additional thermal management energy consumption. If the difference ΔP between the power output of the battery and the power required by the DC-DC converter is small, meaning the DC-DC demand is close to the capacity of the battery, then it is necessary to maintain a stable battery temperature to ensure output efficiency.

[0071] The difference ΔP between the power value that the power battery can release and the power value required by the DC-DC converter is compared with the first preset threshold A to obtain the comparison result. The start and stop of the thermal management function are dynamically controlled according to the comparison result.

[0072] In this application embodiment, the comparison result may be that the difference ΔP between the power value that the power battery can release and the power value required by the DC-DC converter is greater than the first preset threshold A, or the difference ΔP between the power value that the power battery can release and the power value required by the DC-DC converter is equal to the first preset threshold A, or the difference ΔP between the power value that the power battery can release and the power value required by the DC-DC converter is less than the first preset threshold A.

[0073] In this embodiment, by acquiring intelligent charging signals, determining vehicle status, and calculating the difference between the power value that the power battery can release and the power value required by the DC-DC converter in real time during the charging process, combined with dynamic control of the start and stop of the thermal management function using a first preset threshold, significant energy-saving optimization and system efficiency improvement are achieved. Unnecessary thermal management energy consumption is avoided when the battery output capacity far exceeds demand, minimizing energy waste. Furthermore, by suppressing unnecessary temperature fluctuations and frequent operations, the aging rate of the power battery due to thermal stress is indirectly slowed down, extending battery life. Overall, this embodiment balances energy efficiency and system robustness while ensuring charging efficiency and battery safety, thereby improving overall vehicle energy efficiency.

[0074] Figure 2 This is a flowchart illustrating another power battery thermal management method provided in an embodiment of this application. The implementation of the power battery thermal management method is explained in more detail in the embodiment described through this figure.

[0075] like Figure 2 The power battery thermal management method shown includes the following steps:

[0076] S201, Obtain intelligent power replenishment signal.

[0077] S202. Determine whether the vehicle is in intelligent charging state based on intelligent charging signal.

[0078] S203. If the vehicle is in intelligent charging mode, obtain the power value that the power battery can release and the power value required by the DC-DC converter.

[0079] The implementation of S201-S203 is basically the same as that of S101-S103 in the method embodiment described above, and will not be repeated here. The relevant technical implementation can be referred to the above description of S101-S103.

[0080] S204. Determine the comparison result between the difference between the power value that the power battery can release and the power value required by the DC-DC converter and the first preset threshold.

[0081] In this embodiment of the application, the comparison result between the difference between the power value that the power battery can release and the power value required by the DC-DC converter and the first preset threshold may be that the difference between the power value that the power battery can release and the power value required by the DC-DC converter is greater than the first preset threshold, the difference between the power value that the power battery can release and the power value required by the DC-DC converter is equal to the first preset threshold, or the difference between the power value that the power battery can release and the power value required by the DC-DC converter is less than the first preset threshold.

[0082] If the difference between the power value that the power battery can release and the power value required by the DC-DC converter is greater than the first preset threshold, then proceed to step S205; if the difference between the power value that the power battery can release and the power value required by the DC-DC converter is less than or equal to the first preset threshold, then proceed to step S206.

[0083] S205, Thermal management function is disabled.

[0084] In this embodiment of the application, if the difference between the power value that the power battery can release and the power value required by the DC-DC converter is greater than the first preset threshold, i.e., △P>A, it means that the demand of the DC-DC converter is much lower than the battery capacity, the charging task can be completed quickly, and no additional energy is needed for heating or cooling. Therefore, the thermal management function is prohibited.

[0085] S206. Obtain the temperature of the power battery and control the start and stop of the thermal management function according to the temperature of the power battery.

[0086] In this embodiment of the application, if the difference between the power value that the power battery can release and the power value required by the DC-DC converter is less than or equal to a first preset threshold, i.e., ΔP≤A, then temperature control is required to activate thermal management only when necessary to avoid continuous energy consumption.

[0087] In this embodiment of the application, if ΔP≤A, the temperature of the power battery is obtained, and the start and stop of the thermal management function is controlled according to the temperature of the power battery.

[0088] In one example implementation, the temperature of the power battery can be obtained using a temperature sensor.

[0089] In the optional implementation, the steps of obtaining the temperature of the power battery and controlling the start / stop of the thermal management function based on the temperature of the power battery specifically include:

[0090] When the temperature of the power battery exceeds the preset temperature range, the thermal management function is activated.

[0091] In this embodiment, the preset temperature range is set according to actual needs, such as 0℃~35℃. When the temperature of the power battery exceeds the preset temperature range, that is, when the temperature T of the power battery is not within the preset temperature range (such as 0℃~35℃), the BMS generates a thermal management start command to activate the thermal management function.

[0092] In this embodiment, by acquiring intelligent charging signals, judging vehicle status, and calculating the difference between the power value that the power battery can release and the power value required by the DC-DC converter in real time during the charging process, and combining this with dynamic control of the start and stop of the thermal management function based on a first preset threshold, significant energy-saving optimization and system efficiency improvement are achieved. When the difference is greater than the first preset threshold, the heating or cooling function is prohibited from starting, and charging is performed directly to avoid unnecessary thermal management energy consumption when the battery output capacity far exceeds the demand; while when the difference is close to or lower than the first preset threshold, the thermal management module is further precisely started and stopped based on battery temperature to minimize energy waste. This dynamic control logic not only shortens the charging time, but also enhances the system's compatibility and scalability by flexibly adapting the threshold calibration under different scenarios. In addition, by suppressing unnecessary temperature fluctuations and frequent operations, the aging rate of the power battery caused by thermal stress is indirectly slowed down, extending battery life. Overall, this embodiment, while ensuring charging efficiency and battery safety, takes into account both energy efficiency and system robustness, significantly improving the overall vehicle energy efficiency.

[0093] In one alternative implementation, such as Figure 3 The flowchart shown illustrates the specific steps for activating the thermal management function when the battery temperature exceeds the preset temperature range.

[0094] S301. Determine the relationship between the temperature of the power battery and the preset temperature range.

[0095] In this embodiment of the application, when the temperature of the power battery is lower than the lowest temperature of the preset temperature range, such as when T is lower than the lowest temperature of the preset temperature range at 0°C, the process proceeds to step S302; when the temperature of the power battery is higher than the highest temperature of the preset temperature range, such as when T is higher than the highest temperature of the preset temperature range at 35°C, the process proceeds to step S303.

[0096] It should be noted that the minimum and maximum temperatures of the actual preset temperature range are determined based on the actual preset temperature range, and are not specifically limited here.

[0097] S302, Start the heating function.

[0098] In this embodiment of the application, the heating power can be dynamically selected based on the absolute value of the temperature difference |△T1| between the temperature of the power battery and the lowest temperature in the preset temperature range.

[0099] In one example implementation, when |△T1|≤5℃, low-power heating, such as 0.5kW, can be selected;

[0100] When 5℃<|△T1|≤10℃, a moderate power heating can be selected, such as 1kW;

[0101] When |△T1|>10℃, high-power heating, such as 2kW, can be selected.

[0102] In one alternative implementation, the temperature of the power battery is collected periodically (e.g., every 5 seconds) during the heating process to dynamically adjust the heating power.

[0103] S303, Activate cooling function.

[0104] In the embodiments of this application, the cooling function can be implemented by liquid cooling or other cooling methods, and the specific cooling method is not limited here.

[0105] Taking liquid cooling as an example, after starting the liquid cooling pump, the liquid cooling flow rate can be dynamically selected based on the absolute value of the temperature difference between the power battery temperature and the highest temperature in the preset temperature range, |△T2|.

[0106] In one example implementation, when |△T2|≤10℃, a low flow rate mode, such as 2L / min, can be selected; when |△T2|>10℃, a high flow rate mode, such as 5L / min, can be selected.

[0107] S304. When the temperature of the power battery changes more than the initial temperature when the thermal management function is activated, the thermal management function is stopped.

[0108] In this embodiment, the change in the temperature of the power battery relative to the initial temperature when the thermal management function is activated is expressed as ΔT. change The second preset threshold is denoted as B.

[0109] Real-time calculation of the change in battery temperature ΔT relative to the initial temperature when the thermal management function is activated. change When △T change When >B, the thermal management function is stopped.

[0110] In one example implementation, the thermal management function can be stopped by sending a thermal management stop command through the BMS.

[0111] In this embodiment, unnecessary energy consumption is reduced by controlling both the difference threshold and the temperature change. By limiting the temperature change range through a termination threshold, unnecessary energy consumption caused by continuous heating or cooling of the battery (such as prolonged operation after the temperature has reached the target) is avoided. At the same time, structural damage to the battery caused by frequent thermal expansion and contraction is reduced, thereby extending the battery's lifespan.

[0112] Based on the power battery thermal management method provided in the foregoing embodiments, this application also provides a power battery thermal management device. Figure 4 This is a schematic diagram of a power battery thermal management device provided in an embodiment of this application. Figure 4 As shown, the power battery thermal management device includes: a first acquisition module 401, a judgment module 402, a second acquisition module 403, and a control module 404.

[0113] The first acquisition module 401 is used to acquire the intelligent power replenishment signal.

[0114] In this application embodiment, the key basis for determining whether the vehicle is in the intelligent charging state is the intelligent charging signal. The acquisition method can be to communicate with the relevant sensors or control system of the vehicle and receive the input of the intelligent charging signal in real time.

[0115] In one example implementation, the first acquisition module 401 can be connected to the vehicle bus (such as the CAN bus) to subscribe to information related to the intelligent power replenishment signal. When a new intelligent power replenishment signal is generated, the module can acquire the signal in a timely manner and pass it to the subsequent modules for processing.

[0116] The judgment module 402 is used to determine whether the vehicle is in intelligent charging state based on the intelligent charging signal obtained by the first acquisition module 401.

[0117] The second acquisition module 403 is used to acquire the power value that the power battery can release and the power value required by the DC-DC converter if the judgment module 402 determines that the vehicle is in a smart charging state.

[0118] In one example implementation, the release power value of the power battery can be determined based on the real-time temperature and state of charge (SOC) of the power battery. The second acquisition module 403 can communicate with the BMS to acquire the real-time temperature and SOC data of the battery, and calculate the release power value of the power battery using a preset algorithm or model.

[0119] In one example implementation, the second acquisition module 403 can acquire the operating status and required power value of the DC-DC converter in real time by communicating with the control system of the DC-DC converter.

[0120] The control module 404 is used to control the start and stop of the thermal management function based on the comparison result of the difference between the power battery release value and the power value required by the DC-DC converter obtained by the second acquisition module 403 and the first preset threshold.

[0121] This embodiment of the application combines the functions of the acquisition module 401, the judgment module 402, the second acquisition module 403, and the control module 404 to dynamically correlate the intelligent charging status with the power demand of the DC-DC converter, and flexibly adjust the thermal management strategy according to the actual power difference. By combining the intelligent charging signal, the power value required by the DC-DC converter, and the battery status parameters in real time, the thermal management start-stop logic is dynamically optimized, thereby significantly reducing energy loss and improving the overall vehicle energy efficiency while ensuring battery safety.

[0122] In an optional implementation, the control module 404 includes a thermal management function disable unit and a first control unit.

[0123] The thermal management function disable unit is used to disable the thermal management function if the difference between the power value that the power battery can release and the power value required by the DC-DC converter is greater than a first preset threshold, indicating that the battery has sufficient power margin to meet the needs of the DC-DC converter, so as to avoid unnecessary energy consumption.

[0124] The first control unit is used to obtain the temperature of the power battery if the difference between the power value that the power battery can release and the power value required by the DC-DC converter is less than or equal to a first preset threshold, and to control the start and stop of the thermal management function according to the temperature of the power battery.

[0125] In an optional implementation, the first control unit includes a start-up control subunit, which is used to activate the thermal management function when the temperature of the power battery exceeds a preset temperature range.

[0126] In the optional implementation, the startup control subunit is specifically used for:

[0127] When the temperature of the power battery is lower than the minimum temperature of the preset temperature range, the heating function is activated, and the battery is heated by a heating device (such as a heating wire, heating film, etc.).

[0128] When the temperature of the power battery is higher than the maximum temperature of the preset temperature range, the cooling function is activated, and the battery is cooled by a cooling system (such as air cooling, liquid cooling, etc.).

[0129] In an optional implementation, the first control unit further includes a stop control subunit, which is used to stop the thermal management function when the change in the temperature of the power battery relative to the initial temperature when the thermal management function is activated exceeds a second preset threshold, indicating that the battery temperature has reached a suitable range, so as to save energy.

[0130] In the optional implementation, the judgment module 402 is specifically used for:

[0131] If the intelligent charging signal is a high-voltage signal, the vehicle is determined to be in intelligent charging mode.

[0132] If the intelligent charging signal is a low-voltage signal, it is determined that the vehicle is not in intelligent charging mode.

[0133] In an optional implementation, the power value that the power battery can release in the second acquisition module 403 is determined based on the real-time temperature and state of charge of the power battery.

[0134] In this embodiment, the power battery thermal management device dynamically correlates the intelligent charging status with the power demand of the DC-DC converter, enabling flexible adjustment of the thermal management strategy based on the actual power difference, thus improving the intelligence and efficiency of thermal management. By disabling the thermal management function when the battery has sufficient power margin, unnecessary energy consumption is avoided, reducing the overall vehicle energy consumption. By monitoring the battery temperature in real time and promptly activating or deactivating the thermal management function based on temperature changes, the safe operation of the battery is ensured. In this embodiment, through the interaction between the above modules, the thermal management of the power battery can be effectively achieved, improving the performance and reliability of the entire vehicle.

[0135] In addition, this application embodiment also provides a power battery thermal management device, which includes a processor and a memory.

[0136] The memory is used to store program code and transmit the program code to the processor;

[0137] The processor is used to execute the steps of the power battery thermal management method described in any of the above method embodiments according to the instructions in the program code.

[0138] Furthermore, embodiments of this application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the power battery thermal management method as described in any of the method embodiments.

[0139] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the device and equipment embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments. The device and equipment embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the solution in this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0140] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A thermal management method for a power battery, characterized in that, The method includes: Obtain intelligent power replenishment signals; Based on the intelligent charging signal, determine whether the vehicle is in intelligent charging state; If the vehicle is in intelligent charging mode, it can obtain the power value that the power battery can release and the power value required by the DC-DC converter. The start and stop of the thermal management function are controlled based on the comparison result between the difference between the power value that the power battery can release and the power value required by the DC-DC converter and a first preset threshold. The step of controlling the start / stop of the thermal management function based on the comparison result of the difference between the power value that the power battery can release and the power value required by the DC-DC converter and a first preset threshold includes: If the difference is greater than a first preset threshold, the thermal management function is disabled. If the difference is less than or equal to the first preset threshold, the temperature of the power battery is obtained, and the start / stop of the thermal management function is controlled according to the temperature of the power battery.

2. The method according to claim 1, characterized in that, The start / stop of the thermal management function based on the temperature of the power battery includes: When the temperature of the power battery exceeds the preset temperature range, the thermal management function is activated.

3. The method according to claim 2, characterized in that, When the temperature of the power battery exceeds the preset temperature range, the thermal management function is activated, including: When the temperature of the power battery is lower than the lowest temperature within the preset temperature range, the heating function is activated; When the temperature of the power battery is higher than the highest temperature in the preset temperature range, the cooling function is activated.

4. The method according to claim 2, characterized in that, After activating the thermal management function, the method further includes: When the temperature of the power battery changes more than the initial temperature when the thermal management function is activated, the thermal management function is stopped.

5. The method according to claim 1, characterized in that, The power output value of the power battery is determined based on the real-time temperature and state of charge of the power battery.

6. The method according to claim 1, characterized in that, The step of determining whether the vehicle is in intelligent charging state based on the intelligent charging signal includes: If the intelligent charging signal is a high-voltage signal, then the vehicle is determined to be in intelligent charging state; If the intelligent charging signal is a low-voltage signal, then the vehicle is determined not to be in intelligent charging mode.

7. A power battery thermal management device, characterized in that, The device includes: The first acquisition module is used to acquire intelligent power replenishment signals; The judgment module is used to determine whether the vehicle is in intelligent charging state based on the intelligent charging signal; The second acquisition module is used to acquire the power value that the power battery can release and the power value required by the DC-DC converter if the vehicle is in intelligent charging state. The control module is used to control the start and stop of the thermal management function based on the comparison result of the difference between the power value that the power battery can release and the power value required by the DC-DC converter and a first preset threshold. The control module includes a thermal management function disable unit and a first control unit; The thermal management function disable unit is used to disable the thermal management function if the difference between the power value that the power battery can release and the power value required by the DC-DC converter is greater than a first preset threshold. The first control unit is used to obtain the temperature of the power battery if the difference between the power value that the power battery can release and the power value required by the DC-DC converter is less than or equal to a first preset threshold, and to control the start and stop of the thermal management function according to the temperature of the power battery.

8. A power battery thermal management device, characterized in that, include: Processor and memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the steps of the power battery thermal management method according to any one of claims 1 to 6, based on the instructions in the program code.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program code for performing the steps of the power battery thermal management method according to any one of claims 1 to 6.

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