Thermal management method and apparatus for battery pack, and vehicle and storage medium

Abstract

A thermal management method and apparatus for a battery pack, and a vehicle and a storage medium. The method comprises: on the basis of actual performance data of a battery pack of a vehicle during use and original performance data of the battery pack when unused, determining whether the battery pack has undergone aging (step 101); when it is determined that the battery pack has undergone aging, determining a temperature correction amount for thermal management of the battery pack (step 102); and on the basis of the temperature correction amount, adjusting a thermal management strategy of the battery pack, so as to maintain the charging and discharging performance of the battery pack (step 103). The method can determine a temperature correction amount when a battery pack has undergone aging, so as to adjust a thermal management strategy of the battery pack, such that the impact of the aging of the battery pack on charging and discharging performance is taken into consideration more comprehensively, thereby maintaining the charging and discharging performance of a battery pack when the battery pack has undergone aging.

Description

A battery pack thermal management method and device, vehicle and storage medium TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, and in particular to a battery pack thermal management method and device, vehicle and storage medium in the field of vehicles. BACKGROUND

[0002] New energy vehicles are developing faster and faster, and are gradually replacing traditional fuel vehicles and becoming the first choice for people to buy cars. However, one of the current bottlenecks of high-voltage battery packs installed on new energy vehicles is poor low-temperature resistance, that is, the charge and discharge performance of the battery pack is different at different temperatures, and the lower the ambient temperature, the worse the charge and discharge performance. When the ambient temperature is low to a certain extent (such as below -20°C), the battery pack will not be able to charge and discharge.

[0003] In related technologies, in view of high and low temperature environments, various vehicle enterprises have come up with many ways to keep the battery pack warm so that the battery pack can maintain certain or complete discharge performance, ensuring the use of the vehicle and the comfort of the passenger compartment.

[0004] However, the heating or cooling of the battery pack in related technologies only considers the influence of high and low temperature environments on the charge and discharge performance of the battery pack, and is not comprehensive enough. The battery pack still has the problem of reduced performance during charging and discharging. SUMMARY

[0005] The present application provides a battery pack thermal management method, device, vehicle and storage medium, which can determine a temperature correction amount to adjust the thermal management strategy of the battery pack when the battery pack is aging, taking into account the influence of battery pack aging on charge and discharge performance, and is more comprehensive. It is realized that the charge and discharge performance of the battery pack can be maintained even in the case of battery pack aging.

[0006] In a first aspect, a battery pack thermal management method is provided, which includes: determining whether the battery pack has aged based on the actual performance data of the battery pack of the vehicle during use and the original performance data when not in use; determining a temperature correction amount for thermal management of the battery pack in the case of determining that the battery pack has aged; and adjusting the thermal management strategy of the battery pack based on the temperature correction amount to maintain the charge and discharge performance of the battery pack.

[0007] In the technical solution, the actual performance data of the battery pack after aging and the original performance data when not in use are usually different. Based on the actual performance data and the original performance data of the battery pack, it can be accurately determined whether the battery pack is currently aging. In the case where the battery pack is determined to be aging, the temperature correction amount is determined, and the thermal management strategy of the battery pack is adjusted in a timely manner, so that the vehicle performs thermal management on the battery pack based on the adjusted thermal management strategy. The influence of battery pack aging on charge-discharge performance is considered, which is more comprehensive. The actual performance data of the battery pack after thermal management based on the adjusted thermal management strategy is close to or the same as the original performance data. The charge-discharge performance of the battery pack can be maintained even in the case of battery pack aging. The aging process of the battery pack is slowed down, and the service life of the battery pack is prolonged.

[0008] In a possible implementation, in the case where the battery pack is determined to be aging, the temperature correction amount for thermal management of the battery pack is determined, including: in the case where the battery pack is determined to be aging, determining the aging degree of the battery pack based on the actual performance data and the original performance data; and determining the temperature correction amount based on the aging degree.

[0009] In a possible implementation, the actual performance data includes: actual charge-discharge power of the battery pack under a target condition; the original performance data includes: original charge-discharge power of the battery pack under the target condition; the target condition includes: current thermal management temperature and remaining power of the battery pack; and whether the battery pack is aging is determined based on the actual performance data in use and the original performance data when not in use, including: whether the battery pack is aging is determined based on the actual charge-discharge power and the original charge-discharge power under the target condition.

[0010] In a possible implementation, whether the battery pack is aging is determined based on the actual charge-discharge power and the original charge-discharge power under the target condition, including: in the case where the actual charge-discharge power under the target condition is less than the original charge-discharge power, the original charge-discharge power is subtracted by the actual charge-discharge power to obtain a power difference value; and whether the battery pack is aging is determined based on the power difference value.

[0011] In a possible implementation, whether the battery pack is aging is determined based on the power difference value, including: in the case where the power difference value is greater than or equal to a preset difference value, the cumulative number of target working conditions is incremented by 1; wherein the target working condition is a working condition in which the power difference value is greater than or equal to the preset difference value; in the case where the power difference value is less than the preset difference value, the cumulative number is cleared; and in the case where the cumulative number is greater than a preset number, it is determined that the battery pack is aging.

[0012] In a possible implementation manner, the battery pack is adjusted based on the temperature correction amount, and a heat management strategy of the battery pack is adjusted to maintain the charge-discharge performance of the battery pack, including: determining a current heat management temperature of the battery pack; and adjusting the heat management temperature based on the temperature correction amount, so that the vehicle performs heat management on the battery pack based on the adjusted heat management temperature to maintain the charge-discharge performance of the battery pack.

[0013] With reference to the first aspect and the implementation manners above, in some possible implementation manners, the heat management on the battery pack based on the adjusted heat management temperature includes: heating the battery pack to the adjusted heat management temperature in a heating working condition of the battery pack; and cooling the battery pack to the adjusted heat management temperature in a refrigeration working condition of the battery pack.

[0014] The second aspect provides a heat management device of a battery pack, including: a judgment module configured to judge whether the battery pack is aged based on actual performance data of the battery pack in use and original performance data of the battery pack when not in use; a determination module configured to determine a temperature correction amount for heat management of the battery pack when it is determined that the battery pack is aged; and an adjustment module configured to adjust a heat management strategy of the battery pack based on the temperature correction amount to maintain the charge-discharge performance of the battery pack.

[0015] In a possible implementation manner, the determination module is specifically configured to determine a degree of aging of the battery pack based on the actual performance data and the original performance data when it is determined that the battery pack is aged, and determine the temperature correction amount based on the degree of aging.

[0016] In a possible implementation manner, the actual performance data includes actual charge-discharge power of the battery pack under a target condition, and the original performance data includes original charge-discharge power of the battery pack under the target condition; the target condition includes a current heat management temperature and a remaining power of the battery pack; and the judgment module is specifically configured to judge whether the battery pack is aged based on the actual charge-discharge power and the original charge-discharge power under the target condition.

[0017] In a possible implementation manner, the judgment module is specifically configured to, when the actual charge-discharge power under the target condition is less than the original charge-discharge power, subtract the actual charge-discharge power from the original charge-discharge power to obtain a power difference value, and judge whether the battery pack is aged based on the power difference value.

[0018] In a possible implementation manner, the judgment module is specifically configured to, when the power difference value is greater than or equal to a preset difference value, add 1 to a cumulative number of target working conditions, where the target working condition is a working condition in which the power difference value is greater than or equal to the preset difference value; when the power difference value is less than the preset difference value, clear the cumulative number; and when the cumulative number is greater than a preset number, determine that the battery pack is aged.

[0019] In a possible implementation, the adjustment module is specifically configured to determine the current thermal management temperature of the battery pack; and adjust the thermal management temperature based on the temperature correction amount, so that the vehicle performs thermal management on the battery pack based on the adjusted thermal management temperature to maintain the charge-discharge performance of the battery pack.

[0020] In a possible implementation, the adjustment module is specifically configured to heat the battery pack to the adjusted thermal management temperature when the battery pack is in a heating working condition; and cool the battery pack to the adjusted thermal management temperature when the battery pack is in a refrigeration working condition.

[0021] In a third aspect, the present application provides a vehicle, comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to call and run the executable program code from the memory, so that the vehicle executes the method in the first aspect or any possible implementation of the first aspect.

[0022] In a fourth aspect, the present application provides a computer program product, which comprises computer program code. When the computer program code is run on a computer, the computer program code causes the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0023] In a fifth aspect, the present application provides a computer-readable storage medium, which stores computer program code. When the computer program code is run on a computer, the computer program code causes the computer to execute the method in the first aspect or any possible implementation of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a schematic flowchart of a battery pack thermal management method according to an embodiment of the present application.

[0025] FIG. 2 is a control logic diagram according to an embodiment of the present application.

[0026] FIG. 3 is a structural schematic diagram of a battery pack thermal management device according to an embodiment of the present application.

[0027] FIG. 4 is a structural schematic diagram of a vehicle according to an embodiment of the present application. EMBODIMENTS OF THE INVENTION

[0028] The technical solutions in the present application will be described clearly and exhaustively in combination with the drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0029] Hereinafter, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more features.

[0030] In the related art, considering the influence of high and low temperature environments on the charge and discharge performance of the battery pack, when the battery pack is in a high and low temperature environment, the battery pack is heated or cooled by using an air conditioning system to keep the temperature of the battery pack appropriate, using the waste heat of the engine (depending on the thermal management architecture) to heat the battery pack to keep the battery temperature appropriate, using the small current of the self-discharge of the battery pack to self-heat, and other methods to heat or cool the battery pack to ensure the charge and discharge performance of the battery pack.

[0031] However, the charge and discharge performance of the battery pack can also be affected by other factors. In the related art, only the influence of high and low temperature environments on the charge and discharge performance of the battery pack is considered, and the heating or cooling of the battery pack is not comprehensive enough, and the battery pack still cannot maintain the charge and discharge performance.

[0032] Therefore, the present application provides a battery pack thermal management method. When the battery pack is aging, a temperature correction amount is determined to adjust the thermal management strategy of the battery pack, considering the influence of the aging of the battery pack on the charge and discharge performance, and considering more comprehensively, so that the charge and discharge performance of the battery pack can be maintained even in the case of aging of the battery pack.

[0033] FIG. 1 is a schematic flowchart of a battery pack thermal management method according to an embodiment of the present application. The method is applied to a vehicle.

[0034] For example, as shown in FIG. 1, the method 100 includes:

[0035] Step 101, determining whether the battery pack is aging based on the actual performance data of the battery pack of the vehicle during use and the original performance data when not in use;

[0036] Step 102, determining a temperature correction amount for thermal management of the battery pack when it is determined that the battery pack is aging;

[0037] At step 103, based on the temperature correction amount, the thermal management strategy of the battery pack is adjusted to maintain the charge-discharge performance of the battery pack.

[0038] In the embodiment shown in FIG. 1, there is usually a certain difference between the actual performance data of the aged battery pack and the original performance data when the battery pack is not used. Based on the actual performance data and the original performance data of the battery pack, it can be accurately determined whether the battery pack is currently aged. In the case where it is determined that the battery pack is aged, the temperature correction amount is determined, and the thermal management strategy of the battery pack is adjusted in a timely manner, so that the vehicle manages the battery pack based on the adjusted thermal management strategy, taking into account the influence of the aging of the battery pack on the charge-discharge performance, and considering more comprehensively, so that the actual performance data of the battery pack after being managed based on the adjusted thermal management strategy is close to or the same as the original performance data, realizing that the charge-discharge performance of the battery pack can be maintained even in the case where the battery pack is aged, slowing down the aging process of the battery pack, and prolonging the service life of the battery pack.

[0039] The specific implementation of each step in the embodiment shown in FIG. 1 is described in detail as follows:

[0040] In step 101, the vehicle can be a pure electric vehicle or a hybrid vehicle, and the battery pack is a high-voltage battery in the pure electric vehicle or the hybrid vehicle.

[0041] It can be understood that the pure electric vehicle or the hybrid vehicle usually includes a high-voltage system and a low-voltage system. Among them, the low-voltage system includes a low-voltage battery, which is used to start the engine and power the low-voltage electrical system of the vehicle. The high-voltage system includes a high-voltage battery, which is the only source of power for the vehicle in a pure electric vehicle. In a hybrid vehicle, the high-voltage battery can provide additional power or be used for energy recovery, etc. in addition to providing power for the electric motor.

[0042] The actual performance data includes actual performance parameters of the battery pack in actual use, such as actual charge-discharge efficiency, actual capacity, actual internal resistance, etc. The original performance data includes standard performance parameters of the battery pack when it is a new battery or not used, such as original charge-discharge efficiency, original capacity, original internal resistance, etc.

[0043] The vehicle includes a battery management system, in which the original performance data of the battery pack is recorded. Moreover, the battery management system can record the actual performance data of the battery pack during use of the battery pack in the vehicle.

[0044] The actual performance data of the battery pack and the original performance data are compared to determine whether the battery pack is aged. Specifically, it is determined that the battery pack is aged when a difference is determined to exist between the actual performance data and the original performance data. It is determined that the battery pack is not aged when it is determined that no difference exists between the actual performance data and the original performance data.

[0045] It can be understood that the battery pack will be aged to some extent as the battery pack is used, causing the actual performance of the battery pack to gradually decrease and form a difference with the original performance data of the battery pack.

[0046] In a possible implementation, the actual performance data includes actual charge-discharge power of the battery pack under a target condition, and the target condition includes a thermal management temperature and a current remaining power. The original performance data includes original charge-discharge power of the battery pack under the target condition. Whether the battery pack is aged is determined based on the actual performance data of the battery pack during use and the original performance data of the battery pack when not in use, including determining whether the battery pack is aged based on the actual charge-discharge power and the original charge-discharge power under the target condition.

[0047] The thermal management temperature refers to a target temperature that the battery pack needs to maintain when the thermal management system of the vehicle performs thermal management on the battery pack.

[0048] It can be understood that the charge-discharge performance of the battery pack is different at different temperatures, and the lower the ambient temperature, the worse the charge-discharge performance. When the ambient temperature is low to a certain extent (e.g., below -20°C), the battery pack will not be able to charge and discharge. Too high a temperature will also have a negative impact on the battery pack. Specifically, in a high-temperature environment, the evaporation of the electrolyte inside the battery pack is intensified, causing the internal resistance of the battery pack to increase, thereby reducing the charge-discharge capacity of the battery pack. In addition, high temperatures can also cause the activity of the materials inside the battery pack to increase, causing side reactions inside the battery pack, thereby affecting the performance and safety of the battery pack. Therefore, when the battery pack is used in a high-temperature or low-temperature environment, the thermal management system will usually perform thermal management on the battery pack based on a thermal management strategy to maintain the battery pack at a target temperature, so as to ensure the charge-discharge performance of the battery pack.

[0049] The actual performance data can include actual charge-discharge power of the battery pack at the thermal management temperature and the current remaining power when the vehicle charges and discharges the battery pack. When the battery pack is discharged, the actual performance data recorded by the battery management system is the discharge power of the battery pack. When the battery pack is charged, the actual performance data recorded by the battery management system is the charge power of the battery pack.

[0050] The battery management system of the vehicle can store a MAP chart including original charge-discharge power when the battery pack is not used. The battery management system records actual charge-discharge power under the target condition, and then determines the original charge-discharge power of the battery pack under the same target condition from the MAP chart.

[0051] It can be understood that the charge-discharge performance of the same battery pack is different at different temperatures, and the charge-discharge power is also different at different remaining capacities. Therefore, the target condition includes the thermal management temperature and the current remaining capacity of the battery pack.

[0052] By comparing the actual charge-discharge power of the battery pack under the same target condition (i.e., the same thermal management temperature and remaining capacity) with the original charge-discharge power, it is determined whether the battery pack is aged. Specifically, in the case that the actual charge-discharge power is less than the original charge-discharge power, it is determined that the battery pack is aged. In the case that the actual charge-discharge power is equal to the original charge-discharge power, it is determined that the battery pack is not aged.

[0053] For example, the target condition is that the thermal management temperature is 40°C and the current remaining capacity is 60%. The MAP chart is searched to determine that the original charge-discharge power of the battery pack at a temperature of 40°C and a remaining capacity of 60% is 350kw. It is assumed that the actual charge-discharge power of the battery pack at a thermal management temperature of 40°C and a current remaining capacity of 60% is 346kw. The actual charge-discharge power 346kw is less than the original charge-discharge power 350kw, so it is determined that the battery pack is aged.

[0054] In the above method, by comparing the actual charge-discharge power of the battery pack under the same target condition with the original charge-discharge power, it is accurately determined whether the battery pack is aged. Specifically, the charge-discharge performance of the battery pack at different temperatures may be different, and the charge-discharge performance of the battery pack at different remaining capacities may also be different. By comparing the actual charge-discharge power of the battery pack under the same thermal management temperature and current remaining capacity with the original charge-discharge power, the influence of temperature and remaining capacity on the charge-discharge power is considered. The parameter for determining whether the battery pack is aged is the parameter under the same condition, which can make the subsequent determination of whether the battery pack is aged based on the parameter more accurate.

[0055] In a possible implementation, based on the actual charge-discharge power under the target condition and the original charge-discharge power, it is determined whether the battery pack is aged, including: in the case that the actual charge-discharge power under the target condition is less than the original charge-discharge power, the original charge-discharge power is subtracted from the actual charge-discharge power to obtain a power difference; and based on the power difference, it is determined whether the battery pack is aged.

[0056] The preliminary determination of whether the battery pack is aged can be made by comparing the actual charging and discharging power of the battery pack and the original charging and discharging power under the same target condition. Specifically, if the actual charging and discharging power is equal to the original charging and discharging power, it can be determined that the battery pack is not aged. If the actual charging and discharging power is less than the original charging and discharging power, it can be preliminarily determined that the battery pack is possibly aged.

[0057] After the preliminary determination that the battery pack is possibly aged, the original charging and discharging power is subtracted from the actual charging and discharging power to obtain a power difference. Based on the power difference, it can be further determined whether the battery pack is aged.

[0058] Specifically, the power difference can be compared with a preset difference value, which is a power value set in advance based on the performance of the battery pack to determine whether the battery pack is aged. If the power difference is less than the preset difference value, it can be determined that the battery pack is not aged or the aging degree of the battery pack is relatively low, and the thermal management strategy for the battery pack does not need to be adjusted. If the power difference is greater than or equal to the preset difference value, it can be determined that the battery pack is aged, and the thermal management strategy for the battery pack needs to be adjusted.

[0059] For example, the preset difference value is 2kw, the actual charging and discharging power of the battery pack is 346kw, the original charging and discharging power of the battery pack is 350kw, and the power difference is 4kw. Since 4kw is greater than the preset difference value 2kw, it is determined that the battery pack is aged. Assuming that the actual charging and discharging power of the battery pack is 349kw, the original charging and discharging power of the battery pack is 350kw, and the power difference is 1kw, which is less than the preset difference value 2kw, it is determined that the battery pack is not aged.

[0060] In the above method, based on the size of the actual charging and discharging power of the battery pack and the original charging and discharging power under the same target condition, it is preliminarily determined whether the battery pack is aged, and then based on the power difference obtained by subtracting the actual charging and discharging power from the original charging and discharging power, it is further determined whether the battery pack is aged. This double determination method of whether the battery pack is aged improves the accuracy of the determination and avoids false determination of the aging of the battery pack.

[0061] In one possible implementation, based on the power difference, it is determined whether the battery pack is aged, including: in the case that the power difference is greater than or equal to a preset difference value, adding 1 to the cumulative number of target working conditions; wherein the target working condition is a working condition in which the power difference is greater than or equal to the preset difference value; in the case that the power difference is less than the preset difference value, clearing the cumulative number; and in the case that the cumulative number is greater than a preset number, it is determined that the battery pack is aged.

[0062] In some embodiments, a working condition in which the power difference is greater than or equal to the preset difference is recorded as a target working condition, and the number of times the target working condition occurs is accumulated during use of the battery pack. The number of times the target working condition occurs is accumulated by 1 each time the target working condition occurs, and the accumulated number of times is obtained.

[0063] The accumulated number of times can be the number of consecutive occurrences of the target working condition. In the case where the power difference is less than the preset difference (i.e., the battery pack does not exhibit the target working condition), the accumulated number of times needs to be reset to zero.

[0064] Specifically, a counter can be provided in the vehicle, and the default initial value in the counter is usually 0. Each time it is determined that the power difference is greater than or equal to the preset difference (i.e., the battery pack exhibits the target working condition), the counter is incremented by 1. In the case where it is determined that the power difference is less than the preset difference, the count value in the counter is restored to the default initial value. The count value in the counter is the accumulated number of times described above.

[0065] The preset number of times is a number of times set in advance for determining whether the battery pack has aged. When the accumulated number of times is greater than the preset number of times, it is determined that the battery pack has aged. When the accumulated number of times is less than or equal to the preset number of times, it is determined that the battery pack has not aged or the degree of aging is relatively low and can be ignored.

[0066] For example, the preset number of times is 5, and the count value in the counter is 6. It can be determined that the accumulated number of times is 6, and at this time, the accumulated number of times 6 is greater than the preset number of times 5, so it can be determined that the battery pack has aged.

[0067] In the above method, the accumulated number of times is incremented by 1 when the target working condition occurs, and the accumulated number of times is reset to zero when the target working condition does not occur. The number of times the battery pack exhibits the target working condition consecutively is accumulated. When the number of times the battery pack exhibits the target working condition consecutively is greater than the preset number of times, it is determined that the battery pack has aged. This further improves the accuracy of determining whether the battery pack has aged, avoids the situation where the battery pack is determined to have aged due to other reasons such as instability of the battery pack, and avoids redundant adjustment of the thermal management strategy for the battery pack.

[0068] In step 102, the temperature correction amount is the amount of adjustment of the thermal management temperature in the battery thermal management strategy to compensate for the performance decline caused by battery aging.

[0069] For different types of battery packs, different correction amounts can be set in advance. When it is determined that the battery pack of the current vehicle has aged, the temperature correction amount for the battery pack of the current vehicle can be determined from the different correction amounts for different battery packs set in advance based on the type of the battery pack of the current vehicle.

[0070] In a possible implementation, in the case that it is determined that the battery pack is aged, the temperature correction amount for thermal management of the battery pack is determined, including: in the case that it is determined that the battery pack is aged, determining an aging degree of the battery pack based on actual performance data and original performance data; and determining the temperature correction amount based on the aging degree.

[0071] In the case that it is determined that the battery pack is aged, the aging degree of the battery pack can be determined, and the temperature correction amount is determined based on the aging degree of the battery pack.

[0072] Specifically, the aging degree of the battery pack can be determined based on actual performance data and original performance data of the battery pack. The actual performance data of the battery pack can be, for example, an actual capacity of the battery pack, and the original performance data can be, for example, an original capacity of the battery pack. The aging degree of the battery pack can be determined based on the actual capacity and the original capacity of the battery pack.

[0073] As in the above embodiment, the actual performance data of the battery pack can also be an actual charge-discharge power of the battery pack at a thermal management temperature and a current remaining power, and the original performance data of the battery pack can also be an original charge-discharge power of the battery pack at the same thermal management temperature and the current remaining power. Then, the aging degree of the battery pack can be determined based on the actual charge-discharge power and the original charge-discharge power of the battery pack at the same thermal management temperature and the current remaining power.

[0074] The specific steps of determining the aging degree of the battery pack based on the actual charge-discharge power and the original charge-discharge power of the battery pack at the same thermal management temperature and the current remaining power can include: determining a maximum difference value corresponding to a maximum aging degree of the battery pack. The maximum difference value refers to a difference between the actual charge-discharge power and the original charge-discharge power at the maximum aging degree of the battery pack. The aging degree of the battery pack is determined as a percentage obtained by dividing the power difference value obtained in the above embodiment by the maximum difference value. The maximum difference value corresponding to the maximum aging degree can be determined based on the performance of the battery pack.

[0075] For example, the maximum difference value is 20 kw, the original charge-discharge power is 350 kw, and the actual charge-discharge power is 346 kw. The power difference value obtained by subtracting the actual charge-discharge power from the original charge-discharge power is 4 kw. Then, the aging degree is equal to 4 / 20=20%.

[0076] The specific steps of determining the temperature correction amount based on the aging degree can include: multiplying the aging degree by a preset correction amount to obtain the temperature correction amount. The preset correction amount is a maximum temperature value that the battery pack can correct in advance.

[0077] For example, the preset correction amount is 10℃, and then the temperature correction amount=aging degree 20%*10℃=2℃.

[0078] In the above method, the temperature correction amount for the current aging degree can be accurately calculated through the aging degree of the battery pack, and the thermal management strategy is adjusted based on the calculated temperature correction amount, so that the thermal management strategy is adjusted according to the actual aging degree of the battery pack, the adaptability and flexibility of the system are improved, and it is ensured that the battery pack can maintain the charging and discharging performance under different aging degrees.

[0079] In step 103, the thermal management strategy refers to a method for controlling and managing the temperature of the battery pack in order to maintain the performance and safety of the battery pack. The thermal management strategy is usually used to adjust the temperature of the battery pack in a low-temperature or high-temperature environment, so that the battery pack is at a suitable target temperature for charging and discharging, and the charging and discharging performance of the battery pack is maintained.

[0080] After the battery pack ages, the performance of the battery pack decreases, and after the battery pack is managed based on the original thermal management strategy in a low-temperature or high-temperature environment, the charging and discharging power of the battery pack cannot reach the original charging and discharging power. At this time, the thermal management strategy of the battery pack can be adjusted based on the temperature correction amount to maintain the charging and discharging performance of the battery pack.

[0081] In one possible implementation, based on the temperature correction amount, the thermal management strategy of the battery pack is adjusted to maintain the charging and discharging performance of the battery pack, including: determining the current thermal management temperature of the battery pack; based on the temperature correction amount, adjusting the thermal management temperature, so that the vehicle manages the battery pack based on the adjusted thermal management temperature to maintain the charging and discharging performance of the battery pack.

[0082] It can be understood that the thermal management strategy of the battery pack includes a thermal management temperature for managing the battery pack under various conditions. Among them, various conditions include different actual temperatures and different remaining capacities of the battery pack. When the battery is charging and discharging, the thermal management system usually selects a suitable thermal management temperature for the battery pack from the thermal management strategy based on the current state of the battery pack, so that the battery pack reaches the original performance.

[0083] The current state of the battery pack includes the current remaining capacity and the actual temperature of the battery pack. The vehicle can obtain the actual temperature of the battery pack through a temperature sensor and obtain the current remaining capacity of the battery pack through a battery management system, and then determine the thermal management temperature for managing the battery pack from the thermal management strategy based on the actual temperature and the remaining capacity.

[0084] The temperature correction amount can include both positive and negative cases. When the temperature correction amount is positive, the thermal management temperature is adjusted based on the temperature correction amount, that is, the thermal management temperature is increased, and when the temperature correction amount is negative, the thermal management temperature is adjusted based on the temperature correction amount, that is, the thermal management temperature is decreased.

[0085] For example, the thermal management temperature is 40℃, and assuming the temperature correction is +2℃, the thermal management temperature 40℃ is adjusted based on the temperature correction +2℃, and the adjusted thermal management temperature is equal to 42℃. Assuming the temperature correction is -2℃, the thermal management temperature 40℃ is adjusted based on the temperature correction -2℃, and the adjusted thermal management temperature is equal to 38℃.

[0086] The vehicle performs thermal management on the battery pack based on the adjusted thermal management temperature, specifically including: the vehicle performs heating or cooling on the battery pack based on the adjusted thermal management temperature.

[0087] It can be understood that when the temperature of the battery pack does not reach the upper limit of the temperature, the higher the temperature of the battery pack, the higher the charging and discharging power of the battery pack, and therefore the temperature correction determined after aging of the battery pack is usually positive. There may be certain specific working conditions of the battery pack, such as failure, and in the case where the temperature of the battery pack does not reach the lower limit of the temperature, the lower the temperature of the battery pack, the higher the charging and discharging power of the battery pack, and therefore the temperature correction determined at this time can be negative to reduce the thermal management temperature and improve the charging and discharging power of the battery pack.

[0088] In a possible implementation, the thermal management on the battery pack based on the adjusted thermal management temperature includes: in the case where the battery pack is in a heating working condition, heating the battery pack to the adjusted thermal management temperature; and in the case where the battery pack is in a refrigeration working condition, cooling the battery pack to the adjusted thermal management temperature.

[0089] Before the thermal management on the battery pack based on the adjusted thermal management temperature, it is necessary to determine whether the battery pack is currently in a heating working condition or a refrigeration working condition.

[0090] Specifically, the actual temperature of the battery pack can be obtained, and the actual temperature of the battery pack and the adjusted thermal management temperature are compared to determine whether the battery pack is in a heating working condition or a refrigeration working condition.

[0091] Further, in the case where the actual temperature is less than the adjusted thermal management temperature, it can be determined that the battery pack is in a heating working condition; and in the case where the actual temperature is greater than the adjusted thermal management temperature, it can be determined that the battery pack is in a refrigeration working condition.

[0092] In the case where it is determined that the battery pack is in a heating working condition, the battery pack is heated to allow the temperature of the battery pack to rise to the adjusted thermal management temperature, so that the battery pack charges and discharges at the adjusted thermal management temperature, and the charging and discharging power at this time is close to the original charging and discharging power of the battery pack at the thermal management temperature before adjustment.

[0093] For example, the temperature correction amount is +2℃, the thermal management temperature before adjustment is 40℃, the actual charge-discharge power of the battery pack is 346kw, and the original charge-discharge power of the battery pack at 40℃ is 350kw. The adjusted thermal management temperature is 42℃, and the actual charge-discharge power of the battery pack will increase compared to 346kw. The purpose is to make the charge-discharge power of the battery pack at 42℃ close to the original charge-discharge power of the battery pack at 40℃, which is 350kw.

[0094] In a case where it is determined that the battery pack is in the refrigeration working condition, the battery pack is refrigerated to reduce the temperature of the battery pack to the adjusted thermal management temperature, and the battery pack is charged and discharged at the adjusted thermal management temperature. At this time, the charge-discharge power is close to the original charge-discharge power of the battery pack at the thermal management temperature before adjustment.

[0095] The thermal management system of the vehicle includes two main components, a heating system and a cooling system. The heating system can heat the battery pack by any one of an electric heating element, a heat exchanger, etc. Specifically, the electric heating element heating refers to a method of heating by resistance. The electric current passes through the heating element to generate heat, which directly or indirectly heats the battery pack. The heat exchanger heating refers to a method of using a heat exchanger to transfer heat to the coolant, and heating the entire battery pack through the circulation of the coolant. The cooling system can specifically include cooling devices such as a fan, coolant, etc. The battery pack can be cooled by controlling the rotation of the fan; or the battery pack can be cooled by circulating the coolant in the flow channel or cooling plate inside the battery.

[0096] In some embodiments, after adjusting the thermal management strategy of the battery pack based on the target correction amount, the method further includes: determining whether the charge-discharge performance of the battery pack is improved; and prompting the user of the aging state of the battery pack in a case where it is determined that the charge-discharge performance of the battery pack is not improved.

[0097] The step of determining whether the charge-discharge performance of the battery pack is improved can specifically include: detecting that the battery pack is charged and discharged at the adjusted thermal management temperature, obtaining the current charge-discharge power of the battery pack, and comparing the current charge-discharge power of the battery pack with the original charge-discharge power to determine whether the charge-discharge performance of the battery pack is improved.

[0098] Specifically, the original charge-discharge power can be subtracted from the current charge-discharge power to obtain a new power difference value, and it is determined whether the new power difference value is less than a preset difference value. In a case where the new power difference value is less than the preset difference value, it is determined that the charge-discharge performance of the battery pack is improved; and in a case where the new power difference value is greater than the preset difference value, it is determined that the charge-discharge performance of the battery pack is not improved. The preset difference value is the difference value used to determine whether the battery pack is aged in the above embodiments.

[0099] It can be understood that when the temperature of the battery pack is adjusted, the charge-discharge performance of the battery pack does not improve significantly, it can be determined that the aging degree of the battery pack is relatively serious, at this time, the performance of the battery pack cannot be improved to the original performance by adjusting the thermal management temperature, and the battery pack also has a temperature upper limit, and working beyond the temperature upper limit is easy to cause the battery pack to overheat and be damaged. Therefore, the correction of the thermal management temperature is not an unlimited correction, and in the case that the new power difference is greater than the preset difference, it can be determined that the charge-discharge performance of the battery pack is not improved and the battery pack is seriously aged.

[0100] In the case that it is determined that the charge-discharge performance of the battery pack is not improved, the user can be prompted about the aging state of the battery pack. Specifically, prompt information can be generated to prompt the user, and the generated prompt information may, for example, be "the battery pack is seriously aged". In some embodiments, the prompt information can also include information for prompting the user to replace the battery pack in time, and the generated prompt information may, for example, be "the battery pack is seriously aged, please replace the battery pack in time", so as to achieve the purpose of prompting the user about the aging state of the battery pack while reminding the user to replace the battery pack in time.

[0101] FIG. 2 is a schematic diagram of a control logic provided by an embodiment of the present application.

[0102] For example, as shown in FIG. 2, it includes a battery management system 10, a battery self-learning heating or refrigeration function module 20, a battery thermal management function module 30, and a vehicle thermal management system 40.

[0103] The battery management system 10 stores original charge-discharge performance data of the battery pack at different temperatures and remaining capacities.

[0104] The battery self-learning heating or refrigeration function module 20 performs the following steps:

[0105] Step 201, obtaining original charge-discharge performance data of the battery pack;

[0106] Step 202, recording actual charge-discharge power of the battery pack heated to a predetermined temperature and a current remaining capacity;

[0107] Step 203, determining original charge-discharge power corresponding to the predetermined temperature and the current remaining capacity from the original charge-discharge performance data;

[0108] The battery self-learning heating or refrigeration function module 20 obtains the original charge-discharge performance data of the battery pack from the battery management system 10. The predetermined temperature is the thermal management temperature in the above embodiment. The original charge-discharge performance data includes original charge-discharge power of the battery pack at different temperatures and remaining capacities.

[0109] Step 204, judge whether the original charging and discharging power is greater than the actual charging and discharging power; if yes, execute step 205, if not, execute step 202.

[0110] In the case that the original charging and discharging power is greater than the actual charging and discharging power, it can be initially determined that the battery pack may be aged, at which time step 205 needs to be executed to further determine whether the battery pack is aged.

[0111] Step 205, calculate the power difference between the original charging and discharging power and the actual charging and discharging power;

[0112] Step 206, judge whether the power difference is greater than 2kw; if yes, execute step 207, if not, execute step 207.

[0113] Wherein, 2kw is the preset difference in the above embodiment, which can be adjusted according to the actual situation. In the case that the power difference is greater than 2kw, it can be further determined that the battery pack may be aged, at which time step 208 needs to be executed to further determine whether the battery pack is aged.

[0114] Step 207, clear the count value in the counter;

[0115] Step 208, add 1 to the count value in the counter;

[0116] Step 209, judge whether the count value is greater than 5; if yes, execute step 210, otherwise execute step 202.

[0117] Wherein, 5 is the preset number of times in the above embodiment, which can be adjusted according to the actual situation. In the case that the count value is greater than 5, it can be determined that the battery pack is aged, at which time step 210 needs to be executed to adjust the thermal management strategy of the battery pack.

[0118] Step 210, increase or decrease the preheating target temperature of the battery pack by 2℃.

[0119] Wherein, 2℃ is the preset temperature correction amount, which can be adjusted according to the actual situation. The preheating target temperature is the thermal management temperature in the above embodiment, which is determined based on the current temperature and the remaining power of the battery pack.

[0120] Specifically, it can be determined based on the battery pack whether to increase or decrease the preheating target temperature. For example, when it is determined that the battery pack is in a state that the higher the temperature, the higher the charging and discharging power, the preheating target temperature of the battery pack can be increased by 2℃ to increase the actual charging and discharging power of the battery pack. For example, when the battery pack is in a state that the lower the temperature, the higher the charging and discharging power, the preheating target temperature of the battery pack can be decreased by 2℃ to increase the actual charging and discharging power of the battery pack.

[0121] The battery self-learning heating or refrigeration function module 20 sends the raised or lowered pre-heating target temperature to the battery thermal management function module 30, and the battery thermal management function module 30 controls the whole vehicle thermal management system 40 to perform thermal management on the battery pack according to the raised or lowered pre-heating target temperature. The raised or lowered pre-heating target temperature is the adjusted thermal management temperature.

[0122] The whole vehicle thermal management system 40 specifically heats the battery pack to the adjusted thermal management temperature when the battery pack is in a heating working condition, and cools the battery pack to the adjusted thermal management temperature when the battery pack is in a refrigeration working condition.

[0123] In some embodiments, when the battery pack is not aged, the battery thermal management function module 30 obtains the thermal management temperature of the battery pack from the battery management system and sends the thermal management temperature to the whole vehicle thermal management system 40, and the whole vehicle thermal management system 40 performs thermal management on the battery pack according to the thermal management temperature.

[0124] In summary, based on the size of the actual charge-discharge power and the original charge-discharge power of the battery pack under the same target condition, it is preliminarily determined whether the battery pack is aged, and then based on the power difference obtained by subtracting the actual charge-discharge power from the original charge-discharge power, it is further determined whether the battery pack is aged. When the number of times that the battery pack continuously appears in the target working condition (i.e. the power difference is greater than the preset difference value) is greater than the preset number of times, it is determined that the battery pack is aged, which realizes accurate determination of whether the battery pack is aged and avoids redundant adjustment of the thermal management strategy due to false determination of the battery pack aging caused by unstable battery pack and other reasons. When it is determined that the battery pack is aged, the temperature correction amount for the current aging degree is accurately calculated based on the aging degree of the battery pack, the thermal management strategy is adjusted based on the calculated temperature correction amount, the thermal management strategy is adjusted according to the actual aging degree of the battery pack, the adaptability and flexibility of the system are improved, and the charge-discharge performance of the battery pack can be maintained under different aging degrees.

[0125] FIG. 3 is a structural schematic diagram of a battery pack thermal management device provided by an embodiment of the present application.

[0126] For example, as shown in FIG. 3, the device 300 includes:

[0127] The determination module 301 is configured to determine whether the battery pack is aged based on the actual performance data of the battery pack of the vehicle during use and the original performance data when the battery pack is not used.

[0128] The determination module 302 is configured to determine a temperature correction amount for thermal management of the battery pack when it is determined that the battery pack is aged.

[0129] The adjusting module 303 is configured to adjust the thermal management strategy of the battery pack based on the temperature correction amount, so as to maintain the charge-discharge performance of the battery pack.

[0130] In a possible implementation, the determining module 302 is specifically configured to, in a case where it is determined that the battery pack is aged, determine an aging degree of the battery pack based on the actual performance data and the original performance data; and determine the temperature correction amount based on the aging degree.

[0131] In a possible implementation, the actual performance data includes actual charge-discharge power of the battery pack under a target condition; and the original performance data includes original charge-discharge power of the battery pack under the target condition; the target condition includes a current thermal management temperature and a remaining power of the battery pack; and the determining module 301 is specifically configured to determine whether the battery pack is aged based on the actual charge-discharge power and the original charge-discharge power under the target condition.

[0132] In a possible implementation, the determining module 301 is specifically configured to, in a case where the actual charge-discharge power under the target condition is less than the original charge-discharge power, subtract the actual charge-discharge power from the original charge-discharge power to obtain a power difference value; and determine whether the battery pack is aged based on the power difference value.

[0133] In a possible implementation, the determining module 301 is specifically configured to, in a case where the power difference value is greater than or equal to a preset difference value, add 1 to a cumulative number of target working conditions; the target working condition is a working condition in which the power difference value is greater than or equal to the preset difference value; in a case where the power difference value is less than the preset difference value, clear the cumulative number; and in a case where the cumulative number is greater than a preset number, determine that the battery pack is aged.

[0134] In a possible implementation, the adjusting module 303 is specifically configured to determine a current thermal management temperature of the battery pack; and adjust the thermal management temperature based on the temperature correction amount, so that the vehicle performs thermal management on the battery pack based on the adjusted thermal management temperature, to maintain the charge-discharge performance of the battery pack.

[0135] In a possible implementation, the adjusting module 303 is specifically configured to, in a case where the battery pack is in a heating working condition, heat the battery pack to the adjusted thermal management temperature; and in a case where the battery pack is in a refrigeration working condition, cool the battery pack to the adjusted thermal management temperature.

[0136] FIG. 4 is a structural schematic diagram of a vehicle according to an embodiment of the present application.

[0137] For example, as shown in FIG. 4, the vehicle 400 includes a memory 401 and a processor 402, wherein the memory 401 stores executable program code 4011, and the processor 402 is configured to invoke and execute the executable program code 4011 to perform a thermal management method of a battery pack.

[0138] In addition, an apparatus is also protected in the embodiment of the present application, which can include a memory and a processor, wherein the memory stores executable program code, and the processor is configured to invoke and execute the executable program code to perform the battery pack thermal management method provided in the embodiment of the present application.

[0139] The embodiment can divide the apparatus into functional modules according to the method examples described above, for example, each functional module can be provided, or two or more functions can be integrated into one processing module, and the integrated module can be implemented in the form of hardware. It should be noted that the division of the modules in the embodiment is illustrative, and is only a logical function division, and another division mode can be used in actual implementation.

[0140] In the case of dividing each functional module according to each function, the apparatus can further include a judgment module, a determination module, an adjustment module, and the like. It should be noted that all related contents of each step involved in the method embodiments can be referred to the function description of the corresponding functional module, and will not be repeated here.

[0141] It should be understood that the apparatus provided in the embodiment is used to perform the battery pack thermal management method described above, and thus the same effect as the implementation method described above can be achieved.

[0142] In the case of using an integrated unit, the apparatus can include a processing module and a storage module. When the apparatus is applied to a vehicle, the processing module can be used to control and manage the actions of the vehicle. The storage module can be used to support the vehicle to execute related program codes and the like.

[0143] The processing module can be a processor or a controller, which can implement or execute various exemplary logical blocks, modules and circuits shown in combination with the disclosure of the present application. The processor can also be a combination of computing functions, such as one or more microprocessor combinations, combinations of digital signal processing (DSP) and microprocessors, and the like. The storage module can be a memory.

[0144] In addition, the apparatus provided in the embodiment of the present application can be a chip, a component or a module, which can include a connected processor and a memory. The memory is used to store instructions, and when the processor invokes and executes the instructions, the chip can perform the battery pack thermal management method provided in the above embodiment.

[0145] The embodiment further provides a computer readable storage medium, which stores computer program codes, and when the computer program codes are run on a computer, the computer is caused to execute the related method steps to realize the battery pack thermal management method provided in the above embodiment.

[0146] The embodiment further provides a computer program product, which, when run on a computer, causes the computer to execute the related steps to realize the battery pack thermal management method provided in the above embodiment.

[0147] The apparatus, the computer readable storage medium, the computer program product or the chip provided in the embodiment are used to execute the corresponding method provided above, and thus the beneficial effects achieved thereby can refer to the beneficial effects in the corresponding method provided above, which will not be described herein again.

[0148] Through the above description of the embodiments, those skilled in the art can understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to complete all or part of the functions described above.

[0149] In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the apparatus embodiment described above is merely schematic, for example, the division of the modules or units is merely a logical function division, and an actual implementation can be in another division manner, for example, a plurality of units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection can be indirect coupling or communication connection through some interfaces, apparatuses or units, and can be electrical, mechanical or other forms.

[0150] The above is merely specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of thermal management of a battery pack, wherein, The method comprises: determining whether the battery pack is aged based on actual performance data of the battery pack during use and original performance data of the battery pack when not in use; determining a temperature correction amount for thermal management of the battery pack in a case where it is determined that the battery pack is aged; adjusting a thermal management strategy of the battery pack based on the temperature correction amount to maintain the charge-discharge performance of the battery pack.

2. The method of claim 1, wherein, The determination of the temperature correction amount for thermal management of the battery pack in a case where it is determined that the battery pack is aged comprises: determining an aging degree of the battery pack based on the actual performance data and the original performance data in a case where it is determined that the battery pack is aged; determining the temperature correction amount based on the aging degree.

3. The method of claim 1 or 2, wherein, The actual performance data comprises actual charge-discharge power of the battery pack under a target condition, and the original performance data comprises original charge-discharge power of the battery pack under the target condition; the target condition comprises a current thermal management temperature and a remaining power of the battery pack; and the determination of whether the battery pack is aged based on the actual performance data of the battery pack during use and the original performance data of the battery pack when not in use comprises: determining whether the battery pack is aged based on the actual charge-discharge power and the original charge-discharge power under the target condition.

4. The method of claim 3, wherein, The determination of whether the battery pack is aged based on the actual charge-discharge power and the original charge-discharge power under the target condition comprises: in a case where the actual charge-discharge power under the target condition is less than the original charge-discharge power, subtracting the actual charge-discharge power from the original charge-discharge power to obtain a power difference value; and determining whether the battery pack is aged based on the power difference value.

5. The method of claim 4, wherein, The determination of whether the battery pack is aged based on the power difference value comprises: in a case where the power difference value is greater than or equal to a preset difference value, adding 1 to a cumulative number of target working conditions; wherein the target working condition is a working condition in which the power difference value is greater than or equal to the preset difference value; in a case where the power difference value is less than the preset difference value, clearing the cumulative number; and in a case where the cumulative number is greater than a preset number, determining that the battery pack is aged.

6. The method of any one of claims 1 to 5, wherein, The adjustment of the thermal management strategy of the battery pack based on the temperature correction amount to maintain the charge-discharge performance of the battery pack comprises: determining a current thermal management temperature of the battery pack; adjusting the thermal management temperature based on the temperature correction amount, so that the vehicle performs thermal management on the battery pack based on the adjusted thermal management temperature to maintain the charge-discharge performance of the battery pack.

7. The method of claim 6, wherein, The thermal management of the battery pack based on the adjusted thermal management temperature comprises: in a case where the battery pack is in a heating working condition, heating the battery pack to the adjusted thermal management temperature; and in a case where the battery pack is in a refrigeration working condition, cooling the battery pack to the adjusted thermal management temperature.

8. The method of claim 2, wherein, The actual performance data includes actual charge-discharge power of the battery pack under a target condition; the original performance data includes original charge-discharge power of the battery pack under the target condition; the target condition includes a current thermal management temperature and a remaining power of the battery pack; and the determining the aging degree of the battery pack based on the actual performance data and the original performance data includes: determining a maximum difference value corresponding to a maximum aging degree of the battery pack, wherein the maximum difference value is a difference between the actual charge-discharge power and the original charge-discharge power when the battery pack is in the maximum aging degree; subtracting the actual charge-discharge power from the original charge-discharge power to obtain a power difference value; dividing the power difference value by the maximum difference value to obtain a percentage, and determining the percentage as the aging degree of the battery pack.

9. The method of claim 2 or 8, wherein, The determining the temperature correction amount based on the aging degree includes: multiplying the aging degree by a preset correction amount to obtain the temperature correction amount, wherein the preset correction amount is a maximum temperature value that can be corrected by the battery pack.

10. The method according to any one of claims 1 to 9, characterized in that, After adjusting the thermal management strategy of the battery pack based on the temperature correction amount, the method further includes: determining whether the charge-discharge performance of the battery pack is improved; in a case where it is determined that the charge-discharge performance of the battery pack is not improved, prompting a user of an aging state of the battery pack.

11. The method of claim 10, wherein, The determining whether the charge-discharge performance of the battery pack is improved includes: detecting that the battery pack is charging and discharging at the adjusted thermal management temperature, and obtaining current charge-discharge power of the battery pack; based on the current charge-discharge power of the battery pack and the original charge-discharge power, determining whether the charge-discharge performance of the battery pack is improved.

12. The method of claim 11, wherein, The determining whether the charge-discharge performance of the battery pack is improved based on the current charge-discharge power of the battery pack and the original charge-discharge power includes: subtracting the current charge-discharge power of the battery pack from the original charge-discharge power to obtain a new power difference value; in a case where the new power difference value is less than a preset difference value, determining that the charge-discharge performance of the battery pack is improved; in a case where the new power difference value is greater than the preset difference value, determining that the charge-discharge performance of the battery pack is not improved.

13. A thermal management device for a battery pack, wherein, The device includes: a determining module configured to determine, based on actual performance data of a battery pack of a vehicle during use and original performance data of the battery pack when the battery pack is not in use, whether the battery pack has aged; a determining module configured to, in a case where it is determined that the battery pack has aged, determine a temperature correction amount for thermal management of the battery pack; an adjusting module configured to, based on the temperature correction amount, adjust a thermal management strategy of the battery pack to maintain charge-discharge performance of the battery pack.

14. A vehicle, wherein, The vehicle includes: a memory configured to store executable program code; a processor configured to call and run the executable program code from the memory, so that the vehicle performs the method according to any one of claims 1 to 12.

15. A computer readable storage medium, wherein, The computer readable storage medium stores a computer program, which, when executed, implements the method according to any one of claims 1 to 12.

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