Thermal management method and device for power battery and vehicle

Abstract

The application relates to the technical field of thermal management, in particular to a thermal management method and device of a power battery and a vehicle, wherein the method comprises the following steps: obtaining historical operation data of the power battery; calculating the remaining life of the power battery according to the historical operation data; and performing thermal management on the power battery according to the remaining life of the power battery. Therefore, the problem that the energy consumption of vehicle thermal management is increased due to the fact that the demand cannot be allocated according to the actual attenuation of the vehicle in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, and in particular to a thermal management method, device and vehicle for a power battery. Background Technology

[0002] The thermal management issues of new energy vehicles mainly include the following two aspects: (1) the power battery hopes to ensure battery life with a better cooling environment, and (2) the vehicle hopes to achieve the requirements at a lower cost, so it is necessary to link battery life with cooling requirements.

[0003] Most related technologies rely on user operating conditions for thermal management, providing cooling based on the demand from the power battery. However, different customers have different operating conditions. Currently, intelligent computing strategies can adaptively calculate for each vehicle under different operating conditions, minimizing energy consumption for vehicles with mild operating conditions and ensuring battery life for vehicles with severe operating conditions. However, they cannot know the impact of the current operating conditions on the power battery's lifespan, which can easily lead to a reduction in the power battery's lifespan. Furthermore, the inability to allocate demand according to the actual degradation of the vehicle results in increased energy consumption for vehicle thermal management. Summary of the Invention

[0004] This application provides a thermal management method, device, and vehicle for a power battery to solve the problem in related technologies that the inability to allocate demand according to the actual degradation of the vehicle leads to increased energy consumption in vehicle thermal management.

[0005] The first aspect of this application provides a thermal management method for a power battery, comprising the following steps: acquiring historical operating data of the power battery; calculating the remaining battery life of the power battery based on the historical operating data; and performing thermal management on the power battery based on the remaining battery life.

[0006] Optionally, thermal management of the power battery is performed based on the remaining battery life, including: obtaining the remaining life of the target vehicle; determining target thermal management parameters for the power battery based on the remaining battery life and the remaining vehicle life; and performing thermal management of the power battery based on the target thermal management parameters.

[0007] Optionally, the target thermal management parameters of the power battery are determined based on the remaining battery life and the remaining vehicle life, including: calculating the life difference between the remaining battery life and the remaining vehicle life, wherein the life difference represents the degree of difference between the remaining battery life and the remaining vehicle life; and determining the target thermal management parameters of the power battery based on the life difference.

[0008] Optionally, the target thermal management parameters include the target inlet temperature threshold of the power battery. The target thermal management parameters of the power battery are determined based on the life difference, including: obtaining the correspondence between the life difference and the inlet temperature threshold, wherein the correspondence is: the larger the life difference, the higher the inlet temperature threshold; the smaller the life difference, the lower the inlet temperature threshold; and determining the target inlet temperature threshold of the power battery based on the correspondence.

[0009] Optionally, obtaining the remaining lifespan of the target vehicle includes: obtaining the actual mileage of the target vehicle; calculating the remaining mileage based on the maximum design mileage and the actual mileage of the target vehicle; calculating a first ratio percentage of the remaining mileage to the maximum design mileage, and representing the remaining lifespan of the target vehicle based on the first ratio percentage.

[0010] Optionally, the remaining battery life of the power battery is calculated based on historical operating data, including: identifying charging data and discharging data in the historical operating data; calculating the actual capacity of the power battery based on the charging data and discharging data; calculating a first capacity difference between the actual capacity and the cutoff capacity; calculating a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculating a second ratio percentage between the first capacity difference and the second capacity difference; and representing the remaining battery life of the power battery based on the second ratio percentage.

[0011] Optionally, calculating the actual capacity of the power battery based on charging data and discharging data includes: calculating a first remaining maximum capacity of the power battery based on charging data; calculating a second remaining maximum capacity of the power battery based on discharging data; and determining the actual capacity of the power battery based on the average of the first remaining maximum capacity and the second remaining maximum capacity.

[0012] Optionally, before performing thermal management on the power battery based on the remaining battery life, the method further includes: identifying the current highest temperature of a single battery cell in the power battery; determining the thermal management requirements of the power battery based on the current highest temperature; and controlling the thermal management system of the target vehicle to perform the target thermal management operation based on the thermal management requirements.

[0013] A second aspect of this application provides a thermal management device for a power battery, comprising: an acquisition module for acquiring historical operating data of the power battery; a calculation module for calculating the remaining battery life of the power battery based on the historical operating data; and a thermal management module for performing thermal management on the power battery based on the remaining battery life.

[0014] Optionally, the thermal management module is further configured to: obtain the remaining lifespan of the target vehicle; determine the target thermal management parameters of the power battery based on the remaining battery lifespan and the remaining vehicle lifespan; and perform thermal management on the power battery based on the target thermal management parameters.

[0015] Optionally, the thermal management module is further used to: calculate the life difference between the remaining battery life and the remaining vehicle life, wherein the life difference represents the degree of difference between the remaining battery life and the remaining vehicle life; and determine the target thermal management parameters of the power battery based on the life difference.

[0016] Optionally, the thermal management module is further used to: obtain the correspondence between the lifespan difference and the inlet temperature threshold, wherein the correspondence is: the larger the lifespan difference, the higher the inlet temperature threshold; the smaller the lifespan difference, the lower the inlet temperature threshold; and determine the target inlet temperature threshold of the power battery based on the correspondence.

[0017] Optionally, the thermal management module is further configured to: obtain the actual mileage of the target vehicle; calculate the remaining mileage based on the maximum design mileage and the actual mileage of the target vehicle; calculate a first ratio percentage of the remaining mileage to the maximum design mileage, and represent the remaining lifespan of the target vehicle based on the first ratio percentage.

[0018] Optionally, the calculation module is further configured to: identify charging data and discharging data in historical operating data; calculate the actual capacity of the power battery based on the charging data and discharging data; calculate a first capacity difference between the actual capacity and the cutoff capacity; calculate a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculate a second ratio percentage between the first capacity difference and the second capacity difference; and represent the remaining battery life of the power battery based on the second ratio percentage.

[0019] Optionally, the calculation module is further configured to: calculate a first remaining maximum capacity of the power battery based on charging data; calculate a second remaining maximum capacity of the power battery based on discharging data; and determine the actual capacity of the power battery based on the average of the first remaining maximum capacity and the second remaining maximum capacity.

[0020] Optionally, the identification module is further used to: identify the current highest temperature of a single battery cell in the power battery; determine the thermal management requirements of the power battery based on the current highest temperature; and control the thermal management system of the target vehicle to perform the target thermal management operation based on the thermal management requirements.

[0021] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to perform a thermal management method for a power battery as described in the above embodiments.

[0022] Therefore, this application has at least the following beneficial effects:

[0023] This application embodiment can calculate the remaining battery life of the power battery based on historical operating data, and perform thermal management on the power battery based on the remaining battery life. Since the thermal management of the power battery is closely related to the remaining battery life, the power battery needs to be within a suitable temperature range to extend its service life. Thermal management can effectively control the operating temperature of the power battery. Therefore, taking the remaining battery life as one of the factors in thermal management can effectively take into account the impact of thermal management on the life of the power battery. For example, when the remaining battery life is high, energy consumption can be reduced first, and when the remaining battery life is low, the life of the power battery can be prioritized. Thus, by using the remaining battery life to assist thermal management, the energy consumption of thermal management and the life of the power battery can be effectively balanced, improving the user experience.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 This is a flowchart illustrating a thermal management method for a power battery according to an embodiment of this application;

[0027] Figure 2 This is a block diagram of a thermal management device for a power battery according to an embodiment of this application;

[0028] Figure 3 This is a structural schematic diagram of a vehicle provided according to an embodiment of this application. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0030] A related technology provides a thermal management method for an electric vehicle power battery pack. The method includes: acquiring the temperature value of the power battery during the electric vehicle's operation; the electric vehicle's battery management system determining whether the battery pack requires heating or cooling; if so, acquiring the power battery's state of charge as a first parameter, acquiring the electric vehicle's driving speed as a second parameter, acquiring the temperature difference between the battery pack and the environment as a third parameter, and acquiring the remaining mileage to the destination as a fourth parameter; and performing thermal management of the electric vehicle power battery pack using the above four parameters.

[0031] The technical solution provided above couples four parameters, reducing excessive energy loss due to battery pack heating / cooling during vehicle operation, thereby increasing the vehicle's driving range, balancing power and economy, and enhancing the user's driving experience. However, liquid cooling can only provide cooling based on the demand from the power battery; the cooling system is unaware of the power battery's comfort level, the power battery lacks intelligent calculation of its real-time lifespan, and it is also unaware of whether the cooling system's matching is redundant for the current operating conditions.

[0032] With the development of new energy vehicles, cost reduction and efficiency improvement are the main directions. Among them, the life of power battery is closely related to the thermal management strategy of the whole vehicle. The main problem solved by this invention is to calculate the impact of thermal management strategy on power battery in real time, so as to more accurately judge the thermal management demand of power battery, and minimize thermal management energy consumption while ensuring that the life of power battery is not affected.

[0033] The following description, with reference to the accompanying drawings, outlines a thermal management method, apparatus, and vehicle for a power battery according to embodiments of this application.

[0034] Specifically, Figure 1 This is a schematic flowchart of a thermal management method for a power battery provided in an embodiment of this application.

[0035] like Figure 1 As shown, the thermal management method for this power battery includes the following steps:

[0036] In step S101, historical operating data of the power battery is acquired.

[0037] The historical operating data includes the discharge current and charging data of the power battery during vehicle operation, the SOC state of the vehicle during charging and discharging, and the number of charge-discharge cycles.

[0038] It is understood that the embodiments of this application can obtain historical operating data of the power battery in order to calculate the remaining battery life of the power battery based on the historical operating data.

[0039] In step S102, the remaining battery life of the power battery is calculated based on historical operating data.

[0040] It is understood that the embodiments of this application can calculate the remaining battery life of the power battery based on historical operating data, thereby more accurately determining the power battery's demand for thermal management.

[0041] In this embodiment of the application, the remaining battery life of the power battery is calculated based on historical operating data, including: identifying charging data and discharging data in the historical operating data; calculating the actual capacity of the power battery based on the charging data and discharging data; calculating a first capacity difference between the actual capacity and the cutoff capacity; calculating a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculating a second ratio percentage between the first capacity difference and the second capacity difference; and representing the remaining battery life of the power battery based on the second ratio percentage.

[0042] It is understood that the embodiments of this application can calculate the actual capacity of the power battery based on charging data and discharging data, calculate the first capacity difference between the actual capacity and the cutoff capacity, calculate the second capacity difference between the maximum design capacity and the cutoff capacity of the power battery, calculate the second ratio percentage between the first capacity difference and the second capacity difference, and represent the remaining battery life of the power battery based on the second ratio percentage, thereby improving the accuracy of the calculation and more accurately judging the thermal management requirements of the power battery.

[0043] It should be noted that the cutoff capacity can be the maximum usable capacity when the power battery is damaged or unusable. It can be preset at the factory according to the vehicle model. For example, the maximum usable capacity is 80% for passenger cars and 70% for commercial vehicles. The maximum design capacity of the power battery is the maximum energy storage capacity under ideal conditions and is not specifically limited.

[0044] Specifically, the formula for calculating the remaining lifespan of a power battery is as follows:

[0045]

[0046] Where B is the actual capacity of the power battery, and K is the cutoff capacity percentage of the power battery, where K = 80% for passenger vehicles and K = 70% for commercial vehicles.

[0047] Therefore, the above calculation formula can determine the degree of decrease in the current capacity of the power battery relative to its initial capacity.

[0048] In this embodiment of the application, calculating the actual capacity of the power battery based on charging data and discharging data includes: calculating the first remaining maximum capacity of the power battery based on charging data; calculating the second remaining maximum capacity of the power battery based on discharging data; and determining the actual capacity of the power battery based on the average of the first remaining maximum capacity and the second remaining maximum capacity.

[0049] It is understood that the embodiments of this application can calculate the first remaining maximum capacity of the power battery based on charging data; calculate the second remaining maximum capacity of the power battery based on discharging data; and determine the actual capacity of the power battery based on the average of the first remaining maximum capacity and the second remaining maximum capacity, thereby improving the accuracy of the calculation and more accurately judging the power battery's demand for thermal management.

[0050] Specifically, the steps for calculating the actual capacity of the power battery based on charging and discharging data are as follows:

[0051] During the operation of an electric vehicle, if the vehicle discharges, when the current I > 0, the current is integrated over time to obtain C, and the total integral of one discharge is calculated to obtain C1. The number of cycles of the power battery is calculated every 15 days as N = C1 / rated capacity. Combining the power battery's calendar life decay rate Ca and capacity life decay rate F per cycle every 15 days, the remaining maximum capacity of the power battery every 15 days is calculated as: B. f =1-N*FC a .

[0052] Simultaneously, the charging capacity C is calculated by integrating the charging process for items with a State of Charge (SOC) below 30% (S%) every 15 days until they are fully charged to 100%. c The maximum remaining capacity of the power battery each month is calculated as: B c =C c / (100%-S%) / rated capacity, if SOC is not less than 30%, or if charging is not 100%, it can be understood as Bc=Bf; therefore, the final actual capacity of the power battery is B=(Bc+Bf) / 2.

[0053] It should be noted that the calendar lifetime decay rate C a Both the capacity lifetime decay rate F and the calendar lifetime decay rate C can be obtained by looking up a table. a This indicates the degree of degradation of the battery life during daily charge-discharge cycles. The capacity life degradation rate F per cycle indicates the degree of degradation of the battery life during each charge-discharge cycle.

[0054] In step S103, thermal management of the power battery is performed based on the remaining battery life.

[0055] It is understood that the embodiments of this application can perform thermal management of the power battery based on the remaining battery life. By using the remaining battery life to assist thermal management, the energy consumption of thermal management and the life of the power battery can be effectively balanced, thereby improving the user experience.

[0056] In this embodiment of the application, thermal management of the power battery based on the remaining battery life includes: obtaining the remaining life of the target vehicle; determining target thermal management parameters for the power battery based on the remaining battery life and the remaining vehicle life; and performing thermal management on the power battery based on the target thermal management parameters.

[0057] Among them, the target thermal management parameters include the target inlet temperature threshold of the power battery.

[0058] It is understood that the embodiments of this application can determine the target thermal management parameters of the power battery based on the remaining battery life and the remaining vehicle life; thermal management of the power battery is performed based on the target thermal management parameters, thereby more accurately judging the power battery's demand for thermal management, effectively balancing the energy consumption of thermal management and the life of the power battery, and improving the user experience.

[0059] It should be noted that this application mainly focuses on the thermal management of power batteries, which involves controlling the temperature of the power battery's inlet water to cool down according to the target thermal management parameters in order to meet the cooling requirements.

[0060] In this embodiment of the application, obtaining the remaining lifespan of a target vehicle includes: obtaining the actual mileage of the target vehicle; calculating the remaining mileage based on the maximum design mileage and the actual mileage of the target vehicle; calculating a first ratio percentage of the remaining mileage to the maximum design mileage, and representing the remaining lifespan of the target vehicle based on the first ratio percentage.

[0061] It is understood that the embodiments of this application can calculate the remaining mileage based on the maximum design mileage and the actual driving mileage of the target vehicle; calculate the first ratio percentage of the remaining mileage to the maximum design mileage, and represent the remaining lifespan of the target vehicle based on the first ratio percentage, thereby improving the accuracy of subsequent calculations of target thermal management parameters.

[0062] It should be noted that the maximum design mileage of the vehicle refers to the maximum possible total mileage that the vehicle is designed to travel at the factory.

[0063] Specifically, the formula for calculating the remaining lifespan of the target vehicle is: L = (maximum design mileage - actual mileage) / maximum design mileage, where the actual mileage can be the total mileage recorded by the instrument panel.

[0064] In this embodiment of the application, the target thermal management parameters of the power battery are determined based on the remaining battery life and the remaining vehicle life, including: calculating the life difference between the remaining battery life and the remaining vehicle life, wherein the life difference represents the degree of difference between the remaining battery life and the remaining vehicle life; and determining the target thermal management parameters of the power battery based on the life difference.

[0065] It is understood that the embodiments of this application can calculate the life difference between the remaining life of the battery and the remaining life of the vehicle, wherein the life difference represents the degree of difference between the remaining life of the battery and the remaining life of the vehicle; the target thermal management parameters of the power battery are determined based on the life difference, thereby more accurately judging the thermal management requirements of the power battery, effectively balancing the energy consumption of thermal management, the life of the power battery and the remaining life of the battery, and improving the user experience.

[0066] Specifically, the formula for calculating the difference between the remaining battery life and the remaining vehicle life is as follows:

[0067]

[0068] Where B is the actual capacity of the power battery, K is the cutoff capacity percentage of the power battery, K = 80% for passenger cars and K = 70% for commercial vehicles, and L is the remaining lifespan of the target vehicle.

[0069] In this embodiment of the application, the target thermal management parameters include the target inlet temperature threshold of the power battery. Determining the target thermal management parameters of the power battery based on the life difference includes: obtaining the correspondence between the life difference and the inlet temperature threshold, wherein the correspondence is: the larger the life difference, the higher the inlet temperature threshold; the smaller the life difference, the lower the inlet temperature threshold; and determining the target inlet temperature threshold of the power battery based on the correspondence.

[0070] It is understood that in this embodiment of the application, the larger the lifespan difference, the higher the inlet temperature threshold; the smaller the lifespan difference, the lower the inlet temperature threshold. Thus, the target inlet temperature threshold of the power battery is determined based on the above correspondence between the lifespan difference and the inlet temperature threshold, so as to more accurately judge the power battery's demand for thermal management, effectively balance the energy consumption of thermal management, the lifespan of the power battery and the remaining battery life, and improve the user experience.

[0071] It should be noted that the thermal management of power batteries is closely related to the remaining lifespan of the batteries. Power batteries need to be within a suitable temperature range to extend their service life, while exceeding the temperature range will lead to a reduction in service life. This application can effectively control the operating temperature of power batteries through thermal management. Therefore, by including the remaining lifespan of the batteries as one of the factors in thermal management, the impact of thermal management on the lifespan of power batteries can be effectively taken into account. For example, when the remaining lifespan of the batteries is high, energy consumption can be reduced first, and when the remaining lifespan of the batteries is low, the lifespan of the power batteries can be reduced first, thereby using the remaining lifespan of the batteries to assist thermal management.

[0072] In actual operation, vehicle lifespan is affected by battery lifespan. Therefore, the relationship between battery lifespan and vehicle lifespan must be comprehensively considered. Thus, the liquid cooling mode inlet temperature requirement for the power battery is based on a balance between battery lifespan and remaining battery lifespan. If the battery lifespan is lower than the vehicle lifespan, the liquid cooling mode inlet temperature requirement is reduced to ensure normal vehicle operation as much as possible. If the battery lifespan is higher than the vehicle lifespan and there is a surplus of battery lifespan, the liquid cooling mode inlet temperature requirement can be appropriately increased. This effectively balances the energy consumption of thermal management, the lifespan of the power battery, and the remaining battery lifespan, ensuring that the battery maintains its optimal working condition under different operating conditions and improving the user experience.

[0073] Specifically, if the lifespan difference Y ≥ 10%, then the required water inlet temperature for the liquid cooling mode of the power battery is ≤ threshold T3 (e.g., 30℃); if 10% > lifespan difference Y ≥ 5%, then the required water inlet temperature for the liquid cooling mode of the power battery is ≤ threshold T4 (e.g., 25℃); if 2% ≥ lifespan difference Y, then the required water inlet temperature for the liquid cooling mode of the power battery is ≤ threshold T5 (e.g., 20℃); T3 > T4 > T5.

[0074] In this embodiment of the application, before performing thermal management on the power battery based on the remaining battery life, the method further includes: identifying the current highest temperature of a single battery cell in the power battery; determining the thermal management requirements of the power battery based on the current highest temperature; and controlling the thermal management system of the target vehicle to perform the target thermal management operation based on the thermal management requirements.

[0075] It is understood that the embodiments of this application can identify the current highest temperature of a single battery cell in the power battery; determine the thermal management requirements based on the current highest temperature; and control the thermal management system of the target vehicle to perform the target thermal management operation based on the thermal management requirements, thereby dynamically adjusting the thermal management parameters within a certain period of time. This not only meets the thermal management requirements of the power battery, but also effectively balances the energy consumption of thermal management and the lifespan of the power battery, thereby improving the user experience.

[0076] It should be noted that the target operation includes controlling the vehicle's thermal management system to activate the self-circulation mode or to send a liquid cooling mode request to the entire vehicle.

[0077] Specifically, when the battery pack's maximum temperature T max When the temperature exceeds the threshold T1, the power battery management system sends a self-circulation mode request to the vehicle, and the thermal management system activates the self-circulation mode; when the battery pack's maximum temperature T... max When the threshold T2 is greater than 1, the power battery sends a liquid cooling mode request to the vehicle; T1 < T2.

[0078] According to the thermal management method for power batteries proposed in this application, the remaining lifespan of the power battery is calculated based on historical operating data; thermal management of the power battery is performed based on the remaining lifespan, thereby effectively balancing the energy consumption of thermal management and the lifespan of the power battery by using the remaining lifespan to assist thermal management, thus improving the user experience.

[0079] The thermal management method for the power battery of this application will be described in detail below with reference to specific embodiments, as follows:

[0080] Step 1: After the electric vehicle leaves the factory, the battery management system data is monitored in real time.

[0081] When the battery pack's maximum temperature T max When the temperature exceeds the threshold T1, the power battery management system sends a self-circulation mode request to the vehicle, and the thermal management system activates the self-circulation mode; when the battery pack's maximum temperature T... max When the value exceeds the threshold T2, the power battery sends a liquid cooling mode request to the vehicle; T1 < T2.

[0082] Step 2: During the operation of the electric vehicle, if the vehicle discharges, when the current I > 0, integrate the current over time to obtain C, and accumulate the total integral of one discharge to obtain C1. Calculate the number of cycles of the power battery N = C1 / rated capacity every 15 days. Combining the power battery's calendar life decay rate Ca and capacity life decay rate F per cycle every 15 days, calculate the remaining maximum capacity of the power battery every 15 days as: B. f =1-N*FC a .

[0083] Simultaneously, the charging capacity C is calculated by integrating the charging process for items with a State of Charge (SOC) below 30% (S%) every 15 days until they are fully charged to 100%. c The maximum remaining capacity of the power battery each month is calculated as: B c =C c / (100%-S%) / rated capacity, if SOC is not less than 30%, or if charging is not 100%, it can be understood as Bc=Bf; therefore, the final actual capacity of the power battery is B=(Bc+Bf) / 2.

[0084] It should be noted that the calendar lifetime decay rate C a Both the capacity lifetime decay rate F and the calendar lifetime decay rate C can be obtained by looking up a table. a This indicates the degree of degradation of the battery life during daily charge-discharge cycles. The capacity life degradation rate F per cycle indicates the degree of degradation of the battery life during each charge-discharge cycle.

[0085] The formula for calculating the remaining lifespan of a power battery is:

[0086]

[0087] Where B is the actual capacity of the power battery, and K is the cutoff capacity percentage of the power battery, where K = 80% for passenger vehicles and K = 70% for commercial vehicles.

[0088] Step 3: Calculate the remaining lifespan of the target vehicle in real time: L = (design mileage - total mileage recorded by the instrument panel) / design mileage;

[0089] Step 4, combining the calculations from Steps 2 and 3, the formula for calculating the difference between the remaining battery life and the remaining vehicle life is as follows:

[0090]

[0091] Where B is the actual capacity of the power battery, K is the cutoff capacity percentage of the power battery, K = 80% for passenger cars and K = 70% for commercial vehicles, and L is the remaining lifespan of the target vehicle.

[0092] Step 5: If the lifespan difference Y ≥ 10%, then the required water inlet temperature for the power battery liquid cooling mode is ≤ threshold T3 (e.g., 30℃); if 10% > lifespan difference Y ≥ 5%, then the required water inlet temperature for the power battery liquid cooling mode is ≤ threshold T4 (e.g., 25℃); if 2% ≥ lifespan difference Y, then the required water inlet temperature for the power battery liquid cooling mode is ≤ threshold T5 (e.g., 20℃); T3 > T4 > T5.

[0093] In summary, this application calculates the impact of thermal management strategies on power batteries in real time, thereby more accurately determining the thermal management requirements of power batteries and minimizing thermal management energy consumption while ensuring that the lifespan of power batteries is not affected.

[0094] Next, the thermal management device for a power battery according to an embodiment of this application is described with reference to the accompanying drawings.

[0095] Figure 2 This is a block diagram of the thermal management device for a power battery according to an embodiment of this application.

[0096] like Figure 2 As shown, the thermal management device 10 for the power battery includes: an acquisition module 100, a calculation module 200, and a thermal management module 300.

[0097] The acquisition module 100 is used to acquire historical operating data of the power battery; the calculation module 200 is used to calculate the remaining battery life of the power battery based on the historical operating data; and the thermal management module 300 is used to perform thermal management on the power battery based on the remaining battery life.

[0098] In this embodiment of the application, the calculation module 200 is further configured to: calculate the remaining battery life of the power battery based on historical operating data, including: identifying charging data and discharging data in the historical operating data; calculating the actual capacity of the power battery based on the charging data and discharging data; calculating a first capacity difference between the actual capacity and the cutoff capacity; calculating a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculating a second ratio percentage between the first capacity difference and the second capacity difference; and representing the remaining battery life of the power battery based on the second ratio percentage.

[0099] In this embodiment, the calculation module 200 is further configured to: calculate the first remaining maximum capacity of the power battery based on the charging data; calculate the second remaining maximum capacity of the power battery based on the discharging data; and determine the actual capacity of the power battery based on the average of the first remaining maximum capacity and the second remaining maximum capacity.

[0100] In this embodiment, the identification module is further configured to: identify the current highest temperature of the power battery; determine the thermal management requirements of the power battery based on the current highest temperature; and control the thermal management system of the target vehicle to perform the target thermal management operation based on the thermal management requirements.

[0101] In this embodiment, the thermal management module 300 is further configured to: obtain the remaining lifespan of the target vehicle; determine the target thermal management parameters of the power battery based on the remaining battery lifespan and the remaining vehicle lifespan; and perform thermal management on the power battery based on the target thermal management parameters.

[0102] In this embodiment, the thermal management module 300 is further configured to: calculate the life difference between the remaining battery life and the remaining vehicle life, wherein the life difference represents the degree of difference between the remaining battery life and the remaining vehicle life; and determine the target thermal management parameters of the power battery based on the life difference.

[0103] In this embodiment of the application, the thermal management module 300 is further used to: obtain the correspondence between the lifespan difference and the inlet temperature threshold, wherein the correspondence is: the larger the lifespan difference, the higher the inlet temperature threshold; the smaller the lifespan difference, the lower the inlet temperature threshold; and determine the target inlet temperature threshold of the power battery according to the correspondence.

[0104] In this embodiment, the thermal management module 300 is further configured to: obtain the actual mileage of the target vehicle; calculate the remaining mileage based on the maximum design mileage and the actual mileage of the target vehicle; calculate a first ratio percentage of the remaining mileage to the maximum design mileage, and represent the remaining lifespan of the target vehicle based on the first ratio percentage.

[0105] It should be noted that the foregoing explanation of the thermal management method embodiment for power batteries also applies to the thermal management device of the power battery in this embodiment, and will not be repeated here.

[0106] The thermal management device for power batteries proposed in the embodiments of this application calculates the remaining lifespan of the power battery based on historical operating data; and performs thermal management on the power battery based on the remaining lifespan. By using the remaining lifespan to assist thermal management, the energy consumption of thermal management and the lifespan of the power battery can be effectively balanced, thereby improving the user experience.

[0107] Figure 3 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0108] The memory 301, the processor 302, and the computer program stored on the memory 301 and capable of running on the processor 302.

[0109] When the processor 302 executes the program, it implements the thermal management method for the power battery provided in the above embodiments.

[0110] Furthermore, the vehicle also includes:

[0111] Communication interface 303 is used for communication between memory 301 and processor 302.

[0112] The memory 301 is used to store computer programs that can run on the processor 302.

[0113] The memory 301 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0114] If the memory 301, processor 302, and communication interface 303 are implemented independently, then the communication interface 303, memory 301, and processor 302 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0115] Optionally, in a specific implementation, if the memory 301, processor 302, and communication interface 303 are integrated on a single chip, then the memory 301, processor 302, and communication interface 303 can communicate with each other through an internal interface.

[0116] Processor 302 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0117] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0118] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0119] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0120] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0121] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

Claims

1. A method of thermal management of a power battery, characterized in that, Includes the following steps: Obtain historical operating data of the power battery; The remaining battery life of the power battery is calculated based on the historical operating data. Thermal management of the power battery is performed based on the remaining battery life. The thermal management of the power battery based on the remaining battery life includes: Obtain the remaining lifespan of the target vehicle; The target thermal management parameters of the power battery are determined based on the remaining battery life and the remaining vehicle life. Thermal management of the power battery is performed according to the target thermal management parameters; The step of determining the target thermal management parameters of the power battery based on the remaining battery life and the remaining vehicle life includes: Calculate the lifespan difference between the remaining battery lifespan and the remaining vehicle lifespan, wherein the lifespan difference represents the degree of difference between the remaining battery lifespan and the remaining vehicle lifespan; The target thermal management parameters of the power battery are determined based on the lifespan difference. The target thermal management parameters include the target inlet temperature threshold of the power battery, and determining the target thermal management parameters of the power battery based on the lifespan difference includes: Obtain the correspondence between the lifespan difference and the inlet temperature threshold, wherein the correspondence is as follows: the larger the lifespan difference, the higher the inlet temperature threshold; the smaller the lifespan difference, the lower the inlet temperature threshold. The target inlet temperature threshold of the power battery is determined based on the corresponding relationship. The calculation of the remaining battery life of the power battery based on the historical operating data includes: Identify the charging and discharging data in the historical operating data; The actual capacity of the power battery is calculated based on the charging data and the discharging data. Calculate the first capacity difference between the actual capacity and the cutoff capacity, and calculate the second capacity difference between the maximum design capacity of the power battery and the cutoff capacity; Calculate a second ratio percentage between the first capacity difference and the second capacity difference, and represent the remaining battery life of the power battery based on the second ratio percentage; The life difference is calculated by the following method: ; Where B is the actual capacity of the power battery, K is the cutoff capacity percentage of the power battery, K=80% for passenger vehicles and K=70% for commercial vehicles, and L is the remaining lifespan of the target vehicle.

2. The method of thermal management of a power battery according to claim 1, characterized in that, The process of obtaining the remaining lifespan of the target vehicle includes: Obtain the actual mileage of the target vehicle; Calculate the remaining mileage based on the target vehicle's maximum design mileage and the actual mileage driven. Calculate a first percentage ratio of the remaining mileage to the maximum design mileage, and represent the remaining lifespan of the target vehicle based on the first percentage ratio.

3. The method of thermal management of a power battery according to claim 1, wherein, The calculation of the actual capacity of the power battery based on the charging data and the discharging data includes: Calculate the first remaining maximum capacity of the power battery based on the charging data; Calculate the second remaining maximum capacity of the power battery based on the discharge data; The actual capacity of the power battery is determined based on the average of the first remaining maximum capacity and the second remaining maximum capacity.

4. The thermal management method of power cells according to any one of claims 1-3, characterized in that, Before performing thermal management on the power battery based on the remaining battery life, the method further includes: Identify the current highest temperature of a single battery cell in the power battery; The thermal management requirements of the power battery are determined based on the current highest temperature. The thermal management system of the target vehicle is controlled to perform the target thermal management operation according to the stated thermal management requirements.

5. A thermal management device for a power battery, characterized in that The thermal management device is used to implement the thermal management method as described in any one of claims 1-4, and the thermal management device includes: The acquisition module is used to acquire historical operating data of the power battery; The calculation module is used to calculate the remaining battery life of the power battery based on the historical operating data. A thermal management module is used to perform thermal management on the power battery based on the remaining lifespan of the battery.

6. A vehicle characterized by comprising: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the thermal management method for a power battery as described in any one of claims 1-4.

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