Thermal management method and device of power battery and vehicle

Abstract

The invention relates to the technical field of thermal management, in particular to a thermal management method and device of a power battery and a vehicle. Calculating the battery remaining life of the power battery according to the historical operation data; and performing thermal management on the power battery according to the battery residual life. Therefore, the problem that energy consumption of vehicle thermal management is increased due to the fact that requirements cannot be distributed according to the actual attenuation condition of the vehicle in the related technology is solved.

Description

Technical Field

[0001] The present 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 Art

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

[0003] In the related technologies, most of them are based on the user's operating conditions for thermal management, and cooling is provided according to the demand issued by the power battery. However, the operating conditions used by different customers are different. The current intelligent computing strategy can perform adaptive calculations for each vehicle with different operating conditions, so that the energy consumption of vehicles with mild operating conditions can be reduced to a minimum, and the battery life of vehicles with severe operating conditions can be ensured. However, it is impossible to know the impact of the current operating conditions on the life of the power battery, which can easily lead to a reduction in the service life of the power battery. It is impossible to allocate demand according to the actual attenuation of the vehicle, resulting in an increase in the energy consumption of vehicle thermal management. Summary of the invention

[0004] The present application provides a thermal management method, device and vehicle for a power battery to solve the problem in the related art that the demand cannot be allocated according to the actual attenuation of the vehicle, resulting in increased energy consumption of vehicle thermal management.

[0005] A first aspect of the present 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 according to the remaining life of the battery, including: obtaining the remaining life of the target vehicle; determining target thermal management parameters of the power battery according to the remaining life of the battery and the remaining life of the vehicle; and thermal management of the power battery according to the target thermal management parameters.

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

[0008] Optionally, the target thermal management parameters include a target water inlet temperature threshold of the power battery, and determining the target thermal management parameters of the power battery according to the life difference includes: obtaining a correspondence between the life difference and the water inlet temperature threshold, wherein the correspondence is: the greater the life difference, the higher the water inlet temperature threshold; the smaller the life difference, the lower the water inlet temperature threshold; and determining the target water inlet temperature threshold of the power battery according to the correspondence.

[0009] Optionally, obtaining the remaining vehicle life 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 expressing the remaining vehicle life of the target vehicle based on the first ratio percentage.

[0010] Optionally, calculating the remaining battery life of the power battery based on historical operating data includes: 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 the discharging data; calculating a first capacity difference between the actual capacity and the cutoff capacity, and calculating a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculating a second ratio percentage of the first capacity difference to the second capacity difference, and expressing the remaining battery life of the power battery based on the second ratio percentage.

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

[0012] Optionally, before thermally managing the power battery according to the remaining life of the battery, it also includes: identifying the current maximum temperature of the battery cells in the power battery; determining the thermal management requirements of the power battery according to the current maximum temperature; and controlling the thermal management system of the target vehicle to perform target thermal management operations according to the thermal management requirements.

[0013] A second aspect of the present application provides a thermal management device for a power battery, including: 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 of the power battery based on the remaining battery life.

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

[0015] Optionally, the thermal management module is further used to: 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; 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 life difference and the water inlet temperature threshold, wherein the correspondence is: the larger the life difference, the higher the water inlet temperature threshold; the smaller the life difference, the lower the water inlet temperature threshold; determine the target water inlet temperature threshold of the power battery according to the correspondence.

[0017] Optionally, the thermal management module is further used 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 vehicle life of the target vehicle based on the first ratio percentage.

[0018] Optionally, the calculation module is further used 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 the discharging data; calculate a first capacity difference between the actual capacity and the cutoff capacity, and calculate a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculate a second ratio percentage of the first capacity difference to 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 used to: calculate a first remaining maximum capacity of the power battery according to the charging data; calculate a second remaining maximum capacity of the power battery according to the discharging data; and determine the actual capacity of the power battery according to 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 maximum temperature of the battery cells in the power battery; determine the thermal management requirements of the power battery according to the current maximum temperature; and control the thermal management system of the target vehicle to perform target thermal management operations according to the thermal management requirements.

[0021] A third aspect of the present application provides a vehicle, comprising: 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 embodiment.

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

[0023] The embodiment of the present application can calculate the remaining battery life of the power battery according to the historical operating data, and perform thermal management on the power battery according to 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 in a suitable temperature range to extend its service life. The operating temperature of the power battery can be effectively controlled through thermal management. Therefore, taking the remaining battery life as one of the factors of 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. Therefore, the remaining battery life can assist thermal management, which can effectively balance the energy consumption of thermal management and the life of the power battery, thereby improving the user experience.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 A flowchart of a thermal management method for a power battery provided according to an embodiment of the present application;

[0027] Figure 2 A block diagram of a thermal management device for a power battery provided according to an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

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

[0030] A related art provides a thermal management method for an electric vehicle power battery pack, the method comprising: obtaining the temperature value of the power battery during the driving of the electric vehicle; the battery management system of the electric vehicle determines whether the battery pack needs heating or cooling at this time, and if there is a heating or cooling need: obtaining the charge state of the power battery as a first parameter, obtaining the driving speed of the electric vehicle as a second parameter, obtaining the temperature difference between the battery pack and the environment as a third parameter; obtaining the remaining mileage to the destination as a fourth parameter; and performing thermal management on the electric vehicle power battery pack through the above four parameters.

[0031] The technical solution provided above couples four parameters, reduces the excessive energy loss caused by battery pack heating / cooling during vehicle driving, correspondingly improves the vehicle's range during use, takes into account the vehicle's driving power and economy, and improves the user's driving experience. However, liquid cooling can only provide cooling based on the demand from the power battery. The cooling system does not know the comfort level of the power battery. The power battery does not intelligently calculate the real-time life of the power battery, and does not know whether the matching of the cooling system is redundant for the current working conditions.

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

[0033] The following describes a thermal management method, device, and vehicle for a power battery according to an embodiment of the present application with reference to the accompanying drawings.

[0034] Specifically, Figure 1 A schematic flow chart of a thermal management method for a power battery provided in an embodiment of the present application.

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

[0036] In step S101, historical operation data of the power battery is obtained.

[0037] Among them, the historical operation data includes the discharge current data and charging data of the power battery during vehicle driving, the SOC status of the vehicle in the charging and discharging state and the number of charging and discharging cycles, etc.

[0038] It is understandable that the embodiments of the present application can obtain historical operating data of the power battery so as to subsequently 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 the historical operating data.

[0040] It is understandable that the embodiments of the present application can calculate the remaining battery life of the power battery based on historical operating data, so as to more accurately determine the demand for thermal management of the power battery.

[0041] In an embodiment of the present application, the remaining battery life of a 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 the discharging data; calculating a first capacity difference between the actual capacity and the cutoff capacity, and calculating a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculating a second ratio percentage of the first capacity difference to the second capacity difference, and representing the remaining battery life of the power battery based on the second ratio percentage.

[0042] It can be understood that the embodiments of the present application can calculate the actual capacity of the power battery based on the charging data and the discharging data, calculate the first capacity difference between the actual capacity and the cut-off capacity, and calculate the second capacity difference between the maximum design capacity and the cut-off capacity of the power battery; calculate the second ratio percentage of 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 demand for thermal management of the power battery.

[0043] It should be noted that the cut-off capacity can be the maximum available capacity of the power battery when it is damaged or unusable, and can be pre-set at the factory according to the vehicle model. For example, the maximum available capacity of a passenger car is 80%, and the maximum available capacity of a commercial vehicle is 70%. The maximum design capacity of the power battery is the maximum power storage capacity under ideal conditions, and there is no specific limitation.

[0044] Specifically, the calculation formula for the remaining battery life of the power battery is:

[0045]

[0046] Wherein, B is the actual capacity of the power battery, and K is the cut-off capacity percentage of the power battery, wherein K for passenger vehicles is 80% and K for commercial vehicles is 70%.

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

[0048] In an embodiment of the present application, the actual capacity of the power battery is calculated according to the charging data and the discharging data, including: calculating a first remaining maximum capacity of the power battery according to the charging data; calculating a second remaining maximum capacity of the power battery according to the discharging data; and determining the actual capacity of the power battery according to the average of the first remaining maximum capacity and the second remaining maximum capacity.

[0049] It can be understood that the embodiment of the present application can 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; 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 demand for thermal management of the power battery.

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

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

[0052] The charging capacity C is calculated by integrating the charging from 30% SOC to 100% every 15 days. c , calculate the maximum remaining capacity of the power battery per month: B c =C c / (100%-S%) / rated capacity. If the SOC is not less than 30%, or the charge does not reach 100%, it can be understood that Bc=Bf; therefore, the actual capacity of the power battery is B=(Bc+Bf) / 2.

[0053] It should be noted that the calendar life decay rate C a The capacity life decay rate F per cycle can be obtained by looking up the table, and the calendar life decay rate C a It indicates the degree of attenuation of the power battery life in daily charge and discharge cycles. The capacity life attenuation rate F per cycle indicates the degree of attenuation of the power battery life in each charge and discharge cycle.

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

[0055] It can be understood that the embodiments of the present application can perform thermal management on the power battery according to the remaining life of the battery, thereby assisting thermal management through the remaining life of the battery, which can effectively balance the energy consumption of thermal management and the life of the power battery, and improve the user experience.

[0056] In an embodiment of the present application, thermal management of the power battery is performed according to the remaining life of the battery, including: obtaining the remaining vehicle life of the target vehicle; determining target thermal management parameters of the power battery according to the remaining battery life and the remaining vehicle life; and thermally managing the power battery according to the target thermal management parameters.

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

[0058] It can be understood that the embodiments of the present application can determine the target thermal management parameters of the power battery based on the remaining life of the battery and the remaining life of the vehicle; the power battery can be thermally managed according to the target thermal management parameters, so as to more accurately judge the demand for thermal management of the power battery, which can effectively balance the energy consumption of thermal management and the life of the power battery, and enhance the user experience.

[0059] It should be noted that the present application is mainly for thermal management of power batteries, mainly controlling the water inlet temperature of the power batteries to cool down according to target thermal management parameters to meet cooling requirements.

[0060] In an embodiment of the present application, obtaining the remaining vehicle life 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 expressing the remaining vehicle life of the target vehicle based on the first ratio percentage.

[0061] It can be understood that the embodiments of the present application can calculate the remaining mileage based on the maximum design mileage and actual mileage of the target vehicle; calculate the first ratio percentage of the remaining mileage to the maximum design mileage, and represent the remaining vehicle life 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 total mileage of a vehicle is the maximum possible total mileage designed for the current vehicle at the factory.

[0063] Specifically, the remaining life of the target vehicle is calculated as follows: L = (maximum design mileage - actual mileage) / maximum design mileage, where the actual mileage can be the total mileage recorded by the instrument.

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

[0065] It can be understood that the embodiments of the present 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 according to the life difference, so as to more accurately judge the demand for thermal management of the power battery, which can effectively balance the energy consumption of thermal management, the life of the power battery and the remaining life of the battery, and enhance the user experience.

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

[0067]

[0068] Wherein, B is the actual capacity of the power battery, K is the cut-off capacity percentage of the power battery, where K=80% for passenger cars and K=70% for commercial vehicles, and L is the remaining vehicle life of the target vehicle.

[0069] In an embodiment of the present application, the target thermal management parameters include a target water inlet temperature threshold of the power battery. The target thermal management parameters of the power battery are determined according to the life difference, including: obtaining the correspondence between the life difference and the water inlet temperature threshold, wherein the correspondence is: the larger the life difference, the higher the water inlet temperature threshold; the smaller the life difference, the lower the water inlet temperature threshold; and determining the target water inlet temperature threshold of the power battery according to the correspondence.

[0070] It can be understood that in the embodiment of the present application, when the life difference is greater, the water inlet temperature threshold is higher; when the life difference is smaller, the water inlet temperature threshold is lower; thus, the target water inlet temperature threshold of the power battery is determined according to the corresponding relationship between the above-mentioned life difference and the water inlet temperature threshold, so as to more accurately judge the demand of the power battery for thermal management, effectively balance the energy consumption of thermal management, the life of the power battery and the remaining life of the battery, and enhance the user experience.

[0071] It should be noted that the thermal management of power batteries is closely related to the remaining life of the batteries. Power batteries need to be in a suitable temperature range to extend their service life, and exceeding the temperature range will lead to a reduction in service life. The present application can effectively control the operating temperature of the power battery through thermal management. Therefore, taking the remaining life of the battery as one of the factors of thermal management can effectively take into account the impact of thermal management on the life of the power battery. For example, when the remaining life of the battery is high, energy consumption can be reduced first, and when the remaining life of the battery is low, the power battery life can be prioritized, thereby assisting thermal management through the remaining life of the battery.

[0072] In the actual process, the vehicle life is affected by the battery life, and the relationship between battery life and vehicle life must be comprehensively considered. Therefore, the water inlet temperature requirement of the power battery liquid cooling mode is based on the balance between battery life and remaining battery life. If the battery life is lower than the vehicle life, the water inlet temperature requirement of the power battery liquid cooling mode is reduced to ensure the normal driving of the vehicle as much as possible. If the battery life is higher than the vehicle life and the battery life is relatively surplus, the water inlet temperature requirement of the power battery liquid cooling mode can be appropriately increased, thereby effectively balancing the energy consumption of thermal management, the life of the power battery and the remaining battery life, ensuring that the battery can maintain the best working state under different working conditions and improving the user experience.

[0073] Specifically, if the life difference Y ≥ 10%, the water inlet temperature requirement of the power battery liquid cooling mode ≤ the threshold T 3 (such as 30℃); if 10%>life difference Y≥5%, then the water inlet temperature requirement of the power battery liquid cooling mode ≤ threshold T 4 (such as 25℃); if 2% ≥ life difference Y, then the water inlet temperature requirement of the power battery liquid cooling mode ≤ threshold T 5 (e.g. 20℃); T 3 >T 4 >T 5 .

[0074] In an embodiment of the present application, before thermal management of the power battery is performed according to the remaining life of the battery, it also includes: identifying the current maximum temperature of the battery cells in the power battery; determining the thermal management requirements of the power battery according to the current maximum temperature; and controlling the thermal management system of the target vehicle to perform target thermal management operations according to the thermal management requirements.

[0075] It can be understood that the embodiments of the present application can identify the current maximum temperature of the battery cells in the power battery; determine the thermal management requirements based on the current maximum temperature; and control the thermal management system of the target vehicle to perform target thermal management operations based on the thermal management requirements, thereby dynamically adjusting the thermal management parameters within a certain period, which not only meets the power battery's demand for thermal management, but also can effectively balance the energy consumption of thermal management and the life 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 turn on the self-circulation mode or issuing a liquid cooling mode request to the entire vehicle.

[0077] Specifically, when the maximum battery pack temperature T max Greater than the threshold T 1 When the maximum temperature of the battery pack is T max Greater than the threshold T 2When T 1 <T 2 .

[0078] According to the thermal management method for a power battery proposed in an embodiment of the present application, the remaining battery life of the power battery is calculated based on historical operating data; the power battery is thermally managed based on the remaining battery life, thereby assisting thermal management through the remaining battery life, which can effectively balance the energy consumption of thermal management and the life of the power battery, thereby improving the user experience.

[0079] The thermal management method of the power battery of the present application will be described in detail below in conjunction with 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 maximum battery pack temperature T max Greater than the threshold T 1 When the maximum temperature of the battery pack is T max Greater than the threshold T 2 When T 1 <T 2 ;

[0082] Step 2: During the driving process of the electric vehicle, if the vehicle is discharged, when the current I>0, the current is integrated over time to obtain C, and the total integral of one discharge is accumulated to obtain C 1 , calculate the number of cycles of the power battery every 15 days N = C 1 / rated capacity, combined with the power battery's 15-day calendar life decay rate Ca and capacity life per cycle decay rate F, the remaining maximum capacity of the power battery every 15 days is calculated as: B f =1-N*FC a .

[0083] The charging capacity C is calculated by integrating the charging from 30% SOC to 100% every 15 days. c , calculate the maximum remaining capacity of the power battery per month: B c =C c / (100%-S%) / rated capacity. If the SOC is not less than 30%, or the charge does not reach 100%, it can be understood that Bc=Bf; therefore, the actual capacity of the power battery is B=(Bc+Bf) / 2.

[0084] It should be noted that the calendar life decay rate C a The capacity life decay rate F per cycle can be obtained by looking up the table, and the calendar life decay rate Ca It indicates the degree of attenuation of the power battery life in daily charge and discharge cycles. The capacity life attenuation rate F per cycle indicates the degree of attenuation of the power battery life in each charge and discharge cycle.

[0085] The calculation formula for the remaining battery life of the power battery is:

[0086]

[0087] Wherein, B is the actual capacity of the power battery, and K is the cut-off capacity percentage of the power battery, wherein K for passenger vehicles is 80% and K for commercial vehicles is 70%.

[0088] Step 3, real-time calculation of the target vehicle's remaining vehicle life L = (design mileage - total mileage recorded by the instrument) / design mileage;

[0089] Step 4, combining the calculations in steps 2 and 3, the formula for calculating the difference between the remaining life of the battery and the remaining life of the vehicle is:

[0090]

[0091] Wherein, B is the actual capacity of the power battery, K is the cut-off capacity percentage of the power battery, where K=80% for passenger cars and K=70% for commercial vehicles, and L is the remaining vehicle life of the target vehicle.

[0092] Step 5: If the life difference Y ≥ 10%, the water inlet temperature requirement of the power battery liquid cooling mode ≤ the threshold T 3 (such as 30℃); if 10%>life difference Y≥5%, then the water inlet temperature requirement of the power battery liquid cooling mode ≤ threshold T 4 (such as 25℃); if 2% ≥ life difference Y, then the water inlet temperature requirement of the power battery liquid cooling mode ≤ threshold T 5 (e.g. 20℃); T 3 >T 4 >T 5 .

[0093] In summary, the present application calculates the impact of thermal management strategies on power batteries in real time, thereby more accurately determining the power battery's demand for thermal management, and minimizing thermal management energy consumption while ensuring that the power battery life is not affected.

[0094] Next, the thermal management device of the power battery proposed in accordance with the embodiment of the present application is described with reference to the accompanying drawings.

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

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

[0097] Among them, the acquisition module 100 is used to acquire the historical operation data of the power battery; the calculation module 200 is used to calculate the remaining battery life of the power battery according to the historical operation data; and the thermal management module 300 is used to perform thermal management on the power battery according to the remaining battery life.

[0098] In an embodiment of the present application, the calculation module 200 is further used 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 the discharging data; calculating a first capacity difference between the actual capacity and the cutoff capacity, and calculating a second capacity difference between the maximum design capacity and the cutoff capacity of the power battery; calculating a second ratio percentage of 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 an embodiment of the present application, the calculation module 200 is further used to: calculate a first remaining maximum capacity of the power battery according to charging data; calculate a second remaining maximum capacity of the power battery according to discharging data; and determine the actual capacity of the power battery according to the average of the first remaining maximum capacity and the second remaining maximum capacity.

[0100] In an embodiment of the present application, the identification module is further used to: identify the current maximum temperature of the power battery; determine the thermal management requirements of the power battery based on the current maximum temperature; and control the thermal management system of the target vehicle to perform target thermal management operations based on the thermal management requirements.

[0101] In the embodiment of the present application, the thermal management module 300 is further used to: obtain the remaining life of the target vehicle; determine the target thermal management parameters of the power battery according to the remaining life of the battery and the remaining life of the vehicle; and perform thermal management on the power battery according to the target thermal management parameters.

[0102] In an embodiment of the present application, the thermal management module 300 is further used to: 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; and determine the target thermal management parameters of the power battery according to the life difference.

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

[0104] In an embodiment of the present application, the thermal management module 300 is further used 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 vehicle life of the target vehicle based on the first ratio percentage.

[0105] It should be noted that the above explanation of the embodiment of the thermal management method for a power battery is also applicable to the thermal management device for a power battery of this embodiment, and will not be repeated here.

[0106] According to the thermal management device of the power battery proposed in the embodiment of the present application, the remaining battery life of the power battery is calculated based on the historical operating data; the power battery is thermally managed according to the remaining battery life, so as to assist the thermal management through the remaining battery life, which can effectively balance the energy consumption of thermal management and the life of the power battery, and improve the user experience.

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

[0108] A memory 301 , a processor 302 , and a computer program stored in the memory 301 and executable on the processor 302 .

[0109] When the processor 302 executes the program, the thermal management method of the power battery provided in the above embodiment is implemented.

[0110] Furthermore, the vehicle also includes:

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

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

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

[0114] If the memory 301, the processor 302 and the communication interface 303 are implemented independently, the communication interface 303, the memory 301 and the processor 302 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

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

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

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

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

[0119] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0120] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0121] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A thermal management method for a power battery, characterized in that: The following steps are involved: Obtain historical operation data of power batteries; Calculating the remaining battery life of the power battery according to the historical operation data; Thermal management is performed on the power battery according to the remaining life of the battery.

2. The thermal management method of a power battery according to claim 1, characterized in that: The thermal management of the power battery according to the remaining life of the battery includes: Obtain the remaining vehicle life of the target vehicle; Determining a target thermal management parameter of the power battery according to the remaining life of the battery and the remaining life of the vehicle; Thermal management is performed on the power battery according to the target thermal management parameter.

3. The thermal management method of a power battery according to claim 2, characterized in that: The determining the target thermal management parameter of the power battery according to the remaining life of the battery and the remaining life of the vehicle includes: Calculating a life difference between the remaining life of the battery and the remaining life of the vehicle, wherein the life difference represents a degree of difference between the remaining life of the battery and the remaining life of the vehicle; A target thermal management parameter of the power battery is determined according to the life difference.

4. The thermal management method of a power battery according to claim 3, characterized in that: The target thermal management parameter includes a target water inlet temperature threshold of the power battery, and determining the target thermal management parameter of the power battery according to the life difference includes: Obtaining a corresponding relationship between the life difference and the water inlet temperature threshold, wherein the corresponding relationship is: the larger the life difference, the higher the water inlet temperature threshold; the smaller the life difference, the lower the water inlet temperature threshold; The target water inlet temperature threshold of the power battery is determined according to the corresponding relationship.

5. The thermal management method of a power battery according to claim 2, characterized in that: The obtaining of the remaining life of the target vehicle includes: Obtaining the actual mileage of the target vehicle; Calculating the remaining mileage according to the maximum design mileage of the target vehicle and the actual mileage; A first ratio percentage of the remaining mileage to the maximum design mileage is calculated, and a remaining vehicle life of the target vehicle is represented based on the first ratio percentage.

6. The thermal management method of a power battery according to claim 1, characterized in that: The calculating the remaining battery life of the power battery according to the historical operation data includes: Identifying charging data and discharging data in the historical operation data; Calculating the actual capacity of the power battery according to the charging data and the discharging data; Calculating a first capacity difference between the actual capacity and the cut-off capacity, and calculating a second capacity difference between the maximum design capacity of the power battery and the cut-off capacity; A second ratio percentage of the first capacity difference to the second capacity difference is calculated, and the remaining battery life of the power battery is represented based on the second ratio percentage.

7. The thermal management method of a power battery according to claim 6, characterized in that: The calculating the actual capacity of the power battery according to the charging data and the discharging data includes: Calculating a first remaining maximum capacity of the power battery according to the charging data; Calculating a second remaining maximum capacity of the power battery according to the discharge data; The actual capacity of the power battery is determined according to an average of the first maximum remaining capacity and the second maximum remaining capacity.

8. The thermal management method for a power battery according to any one of claims 1 to 7, characterized in that: Before thermal management of the power battery is performed according to the remaining life of the battery, the method further includes: Identifying the current maximum temperature of a battery cell in the power battery; determining a thermal management requirement of the power battery according to the current maximum temperature; The thermal management system of the target vehicle is controlled to perform a target thermal management operation according to the thermal management requirement.

9. A thermal management device for a power battery, characterized in that: include: An acquisition module is used to acquire historical operation data of the power battery; A calculation module, used for calculating the remaining battery life of the power battery according to the historical operation data; A thermal management module is used to perform thermal management on the power battery according to the remaining life of the battery.

10. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the thermal management method for a power battery according to any one of claims 1 to 8.

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