Battery thermal management control method, device, equipment and storage medium

Abstract

This application discloses a battery thermal management control method, apparatus, device, and storage medium, relating to the field of battery thermal management technology. The battery thermal management control method includes: calculating the battery heating temperature based on the current discharge rate, the current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature; performing temperature screening based on the current battery temperature, the first battery temperature, the battery discharge power condition, and the temperature-power mapping relationship to obtain multiple second battery temperatures; determining a target battery temperature based on the first battery temperature and the multiple second battery temperatures; and performing thermal management control on the battery of a target vehicle based on the target battery temperature. By comparing the heating boost amount ≥ the heating consumption amount, while meeting the user's vehicle power requirements, the optimal heating target temperature is found, thereby maximizing the available discharge capacity of the battery assembly while meeting the user's vehicle needs.

Description

Technical Field

[0001] The present application relates to the field of battery thermal management technology, and in particular to battery thermal management control methods, devices, equipment, and storage media. Background Art

[0002] Because batteries have a low discharge rate at low temperatures, especially LFP battery assemblies, users need to activate the battery heating function when driving in low temperatures. While battery heating can improve battery performance (charge and discharge capacity), it also consumes additional energy. Therefore, determining the heating temperature that can both meet user needs and maximize the battery's available discharge capacity is a key issue. Therefore, how to maximize the battery assembly's available discharge capacity while meeting user needs has become a pressing issue. Summary of the Invention

[0003] The main purpose of this application is to provide a battery thermal management control method, device, equipment and storage medium, aiming to solve the technical problem of how to maximize the available discharge capacity of the battery assembly on the basis of meeting the user's vehicle needs.

[0004] To achieve the above objectives, the present application proposes a battery thermal management control method, which includes:

[0005] Calculating a battery heating temperature according to a current discharge rate, a current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature;

[0006] performing temperature screening according to the current battery temperature, the first battery temperature, a battery discharge power condition, and a temperature-power mapping relationship to obtain a plurality of second battery temperatures;

[0007] determining a target battery temperature according to the first battery temperature and a plurality of the second battery temperatures;

[0008] Thermal management control is performed on a battery of a target vehicle according to the target battery temperature.

[0009] In one embodiment, the calculating the battery heating temperature according to the current discharge rate, the current battery temperature, and the preset discharge capacity strategy to obtain the first battery temperature includes:

[0010] Compare the current battery temperature with the discharge temperature of each battery in the preset discharge capacity strategy to obtain the target discharge temperature;

[0011] Calculating heating consumption energy according to the current battery temperature and the target discharge temperature to obtain battery heating energy;

[0012] The battery heating temperature is calculated according to the current discharge rate, the current battery temperature, a preset discharge capacity strategy, the target discharge temperature, and the battery heating energy to obtain a first battery temperature.

[0013] In one embodiment, calculating the battery heating temperature according to the current discharge rate, the current battery temperature, a preset discharge capacity strategy, the target discharge temperature, and the battery heating energy to obtain the first battery temperature includes:

[0014] determining, according to a current discharge rate, the current battery temperature, a preset discharge capacity strategy, and the target discharge temperature, a discharge capacity corresponding to the current battery temperature and a discharge capacity corresponding to the target discharge temperature;

[0015] determining a target capacity difference according to the battery heating energy, the discharge capacity corresponding to the current battery temperature, and the discharge capacity corresponding to the target discharge temperature;

[0016] The first battery temperature is determined according to a target discharge temperature corresponding to the target capacity difference.

[0017] In one embodiment, the temperature screening is performed according to the current battery temperature, the first battery temperature, the battery discharge power condition, and the temperature-power mapping relationship to obtain multiple second battery temperatures, including:

[0018] determining a battery remaining capacity corresponding to the first battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the first battery temperature;

[0019] Temperature screening is performed according to the battery remaining capacity, battery discharge power condition, and temperature-power mapping relationship corresponding to the first battery temperature to obtain multiple second battery temperatures.

[0020] In one embodiment, determining the target battery temperature according to the first battery temperature and a plurality of second battery temperatures includes:

[0021] determining a corresponding target temperature range according to an extreme battery temperature among the plurality of second battery temperatures;

[0022] Comparing the first battery temperature with the target temperature range to obtain a temperature comparison result;

[0023] When the temperature comparison result shows that the first battery temperature is within the target temperature range, the first battery temperature is determined to be the target battery temperature.

[0024] In one embodiment, after comparing the first battery temperature with the target temperature range to obtain a temperature comparison result, the method further includes:

[0025] When the temperature comparison result shows that the first battery temperature is not within the target temperature range, calculating a battery heating temperature according to the current discharge rate, the current battery temperature, a plurality of second battery temperatures, and a preset discharge capacity strategy to obtain a third battery temperature;

[0026] The target battery temperature is determined according to the third battery temperature and the battery discharge power condition.

[0027] In one embodiment, determining the target battery temperature according to the third battery temperature and the battery discharge power condition includes:

[0028] determining the remaining battery capacity corresponding to the third battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the third battery temperature;

[0029] determining the instantaneous discharge power and the continuous discharge power corresponding to the third battery temperature according to the temperature-power mapping table and the battery remaining capacity corresponding to the third battery temperature;

[0030] When the instantaneous discharge power and the continuous discharge power corresponding to the third battery temperature meet a battery discharge power condition, the third battery temperature is determined to be the target battery temperature.

[0031] In addition, to achieve the above objectives, the present application also proposes a battery thermal management control device, the battery thermal management control device comprising:

[0032] a calculation module, configured to calculate a battery heating temperature according to a current discharge rate, a current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature;

[0033] a screening module, configured to perform temperature screening according to the current battery temperature, the first battery temperature, and a battery discharge power condition to obtain a plurality of second battery temperatures;

[0034] The calculation module is further configured to determine a target battery temperature based on the first battery temperature and a plurality of second battery temperatures;

[0035] A control module is used to perform thermal management control on a battery of a target vehicle according to the target battery temperature.

[0036] In addition, to achieve the above-mentioned purpose, the present application also proposes a battery thermal management control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the battery thermal management control method as described above.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the steps of the battery thermal management control method as described above are implemented.

[0038] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the battery thermal management control method as described above are implemented.

[0039] This application calculates the battery heating temperature based on the current discharge rate, current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature; performs temperature screening based on the current battery temperature, the first battery temperature, battery discharge power conditions, and a temperature-power mapping relationship to obtain multiple second battery temperatures; determines a target battery temperature based on the first battery temperature and multiple second battery temperatures; and performs thermal management control on the target vehicle's battery based on the target battery temperature. By comparing the heating boost amount to the heating consumption amount while simultaneously meeting the user's vehicle power requirements, the optimal heating target temperature is found, thereby maximizing the battery assembly's available discharge capacity while meeting the user's vehicle power requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 A flowchart of the first embodiment of the battery thermal management control method of the present application is provided;

[0043] Figure 2 A schematic diagram of an instantaneous discharge power map provided in Example 1 of the battery thermal management control method of this application;

[0044] Figure 3 A schematic diagram of a continuous discharge power map provided in Example 1 of the battery thermal management control method of this application;

[0045] Figure 4 A flow chart illustrating a second embodiment of the battery thermal management control method of the present application;

[0046] Figure 5 This is a schematic diagram of the module structure of the battery thermal management control device according to an embodiment of the present application;

[0047] Figure 6 Schematic diagram of the device structure of the hardware operating environment involved in the battery thermal management control method in the embodiment of the present application.

[0048] The purpose, features and advantages of this application will be further explained with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0049] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0050] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0051] The main solution of the embodiment of the present application is: calculate the battery heating temperature based on the current discharge rate, the current battery temperature and the preset discharge capacity strategy to obtain a first battery temperature; perform temperature screening based on the current battery temperature, the first battery temperature, the battery discharge power condition and the temperature-power mapping relationship to obtain multiple second battery temperatures; determine the target battery temperature based on the first battery temperature and the multiple second battery temperatures; and perform thermal management control on the battery of the target vehicle based on the target battery temperature.

[0052] Because batteries have a low discharge rate at low temperatures, especially LFP battery assemblies, users need to activate the battery heating function when driving in low temperatures. While battery heating can improve battery performance (charge and discharge capacity), it also consumes additional energy. Therefore, determining the heating temperature that can both meet user needs and maximize the battery's available discharge capacity is a key issue. Therefore, how to maximize the battery assembly's available discharge capacity while meeting user needs has become a pressing issue.

[0053] This application calculates the battery heating temperature based on the current discharge rate, current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature; performs temperature screening based on the current battery temperature, the first battery temperature, battery discharge power conditions, and a temperature-power mapping relationship to obtain multiple second battery temperatures; determines a target battery temperature based on the first battery temperature and multiple second battery temperatures; and performs thermal management control on the target vehicle's battery based on the target battery temperature. By comparing the heating boost amount to the heating consumption amount while simultaneously meeting the user's vehicle power requirements, the optimal heating target temperature is found, thereby maximizing the battery assembly's available discharge capacity while meeting the user's vehicle power requirements.

[0054] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, mobile phone, etc., or a battery thermal management control device capable of implementing the above functions. The following describes this embodiment and the following embodiments using a battery thermal management control device as the execution subject.

[0055] Based on this, the embodiment of the present application provides a battery thermal management control method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the battery thermal management control method of the present application.

[0056] In this embodiment, the battery thermal management control method includes steps S10 to S40:

[0057] Step S10, calculating the battery heating temperature according to the current discharge rate, the current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature;

[0058] It can be understood that the current discharge rate refers to the ability of the battery to release electrical energy per unit time, the current battery temperature refers to the current temperature of the battery, the preset discharge capacity strategy refers to the mapping relationship between the discharge capacity under different temperatures and different discharge rates, and the first battery temperature refers to the battery temperature corresponding to the maximum discharge capacity.

[0059] In a specific implementation, a judgment is made between the battery heating power consumption and the increase in discharge capacity. Assuming that the current battery temperature is T1 and the heating target is T2, the capacity retention rates corresponding to T1 and T2 are a1 and a2, respectively. According to the calculation formula cm△T=Q, a certain heat exchange efficiency is superimposed to calculate the heating power consumption E1. The heating to the target T2 is E2. The heating target T2 corresponding to the maximum positive value of f(T2)=E2-E1 is found. The heating target T2 is the maximum temperature target value for battery heating to increase the driving range, that is, the first battery temperature is obtained. The dischargeable capacity of the battery is different at different temperatures and discharge rates (generally referred to as capacity retention rate, actual dischargeable capacity / theoretical capacity). As shown in Table 1, the dischargeable capacity at different temperatures and discharge rates can be obtained.

[0060] Table 1:

[0061]

[0062] In a feasible implementation, step S10 may include steps A11 to A13:

[0063] Step A11, comparing the current battery temperature with the discharge temperature of each battery in the preset discharge capacity strategy to obtain a target discharge temperature;

[0064] It can be understood that the target discharge temperature refers to a battery discharge temperature that is greater than the current battery temperature.

[0065] In a specific implementation, the discharge temperatures of each battery in the mapping relationship of the discharge capacity at different temperatures and discharge rates include -30°C, -20°C, -10°C, etc. In order to obtain the maximum temperature target value for battery heating to improve driving range, the discharge temperatures of each battery in the mapping relationship of the discharge capacity at different temperatures and discharge rates are screened according to the current temperature of the battery, and multiple battery discharge temperatures greater than the current battery temperature are obtained.

[0066] Step A12, calculating heating consumption energy according to the current battery temperature and the target discharge temperature to obtain battery heating energy;

[0067] It can be understood that the battery heating energy refers to the amount of electricity consumed when the battery temperature is heated from T1 to T2.

[0068] In the specific implementation, assuming that the current temperature of the battery is T1 and the heating target temperature is T2, the energy consumed by heating the battery cell is E1 = cm△T / n, where C is the specific heat capacity of the battery cell, in kj / (kg*℃), m is the total mass of the battery cell of the battery assembly, in kg, △T is the difference between T2-T1, in ℃, and n is the efficiency of converting heating electrical energy into battery thermal energy (this value can be calculated through actual bench verification to calculate the heating conversion efficiency, which varies depending on the project, generally about 40-60%). The energy E1 consumed in heating from the current temperature T1 to the target temperature T2 can be calculated, and the battery heating energy can be obtained.

[0069] Step A13 , calculating the battery heating temperature according to the current discharge rate, the current battery temperature, the preset discharge capacity strategy, the target discharge temperature, and the battery heating energy to obtain a first battery temperature.

[0070] It can be understood that the dischargeable energy corresponding to the current temperature of the battery is determined by mapping the dischargeable capacity at different temperatures and discharge rates based on the current temperature and current discharge rate of the battery, and then the dischargeable energy corresponding to the target temperature of the battery is determined by mapping the dischargeable capacity at different temperatures and discharge rates based on the target temperature of the battery and the current discharge rate. The first battery temperature is calculated in combination with the power consumed when the battery temperature is heated from T1 to T2.

[0071] It should be noted that the increase in dischargeable energy corresponding to the battery temperature being heated from T1 to T2 is E2=ET2-ET1, where ET2 is the dischargeable energy corresponding to the capacity retention rate corresponding to the heating target temperature T2 (generally simply calculated as platform voltage * capacity retention rate * theoretical capacity), and ET1 is the dischargeable energy corresponding to the capacity retention rate corresponding to the current temperature. Calculate f(T2)=E2-E1=ET2-ET1-cm△T / n. (The value range of T1 and T2 is the dischargeable temperature range of the battery cell, generally -30°C to 55°C), find the maximum value of f(T2), and calculate the maximum value of multiple battery discharge temperatures that are greater than the current battery temperature through f(T2)=E2-E1. The battery discharge temperature corresponding to the maximum value of f(T2) is the first battery temperature.

[0072] In a feasible implementation, step A13 may include steps B131 to A133:

[0073] Step B131, determining the discharge capacity corresponding to the current battery temperature and the discharge capacity corresponding to the target discharge temperature according to the current discharge rate, the current battery temperature, a preset discharge capacity strategy, and the target discharge temperature;

[0074] It can be understood that, based on the current discharge rate of the battery and the current battery temperature, the discharge capacity corresponding to the current battery temperature is determined by the mapping relationship of the dischargeable capacity at different temperatures and discharge rates, and then based on the target discharge rate of the battery and the current battery temperature, the discharge capacity corresponding to the target battery temperature is determined by the mapping relationship of the dischargeable capacity at different temperatures and discharge rates.

[0075] Step B132, determining a target capacity difference based on the battery heating energy, the discharge capacity corresponding to the current battery temperature, and the discharge capacity corresponding to the target discharge temperature;

[0076] It can be understood that the target capacity difference refers to the actual increase in discharge capacity of the battery when it is heated from the current temperature to the target temperature.

[0077] In a specific implementation, the difference between the discharge capacity corresponding to the standard discharge temperature, the discharge capacity corresponding to the current battery temperature, and the energy consumed by battery heating is calculated to obtain the actual increase in discharge capacity of the battery when heated from the current temperature to the target temperature.

[0078] Step B133: Determine the first battery temperature according to the target discharge temperature corresponding to the target capacity difference.

[0079] It can be understood that the corresponding target capacity differences are obtained through multiple battery discharge temperatures greater than the current battery temperature, and then the first battery temperature is determined according to the target discharge temperature corresponding to the maximum value of the dischargeable capacity actually increased when the battery is heated from the current temperature to the target temperature.

[0080] Step S20, performing temperature screening according to the current battery temperature, the first battery temperature, the battery discharge power condition, and the temperature-power mapping relationship to obtain a plurality of second battery temperatures;

[0081] It can be understood that the temperature-power mapping relationship includes a battery temperature-continuous discharge power mapping relationship and a battery temperature-instantaneous discharge power mapping relationship. The second battery temperature refers to the battery temperature corresponding to the user's vehicle usage needs. The battery discharge power condition refers to the 60s power of F(T, SOC) ≥ 20kw, and the 10s power of F(T, SOC) ≥ 60kw. This embodiment does not limit the size of the above-mentioned continuous discharge power and instantaneous discharge power, and the continuous discharge power and instantaneous discharge power can be set according to specific circumstances.

[0082] In a specific implementation, the user's urban road speed is generally 60km / h, and the required 60s continuous discharge power is about 20kw (different for different models), and the instantaneous discharge power is about 60kw for 10s. The SOC corresponding to the heating target temperature T2 (the first battery temperature) should meet the continuous discharge power and instantaneous discharge power requirements. The SOC corresponding to the target temperature T2 when heated is equal to the current SOC (the SOC corresponding to the current battery temperature) - heating energy consumption E1 / theoretical power (the maximum discharge capacity of the battery), that is, the 60s power of F(T, SOC) is ≥20kw, and the 10s power of F(T, SOC) is ≥60kw. According to the SOC when heated to T2, the table is looked up to meet the temperature value T3 corresponding to the above power, that is, multiple second battery temperatures are obtained, among which the instantaneous discharge power map is as follows Figure 2 As shown, the continuous discharge power map is as follows Figure 3 shown.

[0083] In a feasible implementation, step S20 may include steps A21 to A22:

[0084] Step A21, determining the battery remaining capacity corresponding to the first battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the first battery temperature;

[0085] It can be understood that the target temperature T2 corresponds to SOC = current SOC - heating energy consumption E1 / theoretical power, where the current SOC refers to the SOC corresponding to the current battery temperature (T1), the heating energy consumption E1 refers to the battery heating energy corresponding to the first battery temperature, and the theoretical power refers to the maximum dischargeable capacity of the battery.

[0086] Step A22 , performing temperature screening according to the battery remaining capacity, battery discharge power condition, and temperature-power mapping relationship corresponding to the first battery temperature to obtain a plurality of second battery temperatures.

[0087] It can be understood that, based on the battery discharge power conditions of F(T, SOC) 60s power ≥ 20kw and F(T, SOC) 10s power ≥ 60kw, combined with the remaining battery power corresponding to the first battery temperature, the battery temperatures that meet the battery discharge power conditions in the temperature-power mapping relationship are screened to obtain multiple second battery temperatures.

[0088] Step S30, determining a target battery temperature according to the first battery temperature and a plurality of the second battery temperatures;

[0089] It can be understood that the target battery temperature refers to the battery heating temperature that increases the maximum discharge capacity on the basis of meeting the user's vehicle power needs.

[0090] In a specific implementation, since the first battery temperature (T2) solved is one value and the second battery temperature (T3) solved is multiple values, the first battery temperature and multiple second battery temperatures are analyzed according to the characteristics of the battery cells to determine the battery heating temperature with the maximum discharge capacity that meets the user's vehicle power requirements.

[0091] Step S40 : performing thermal management control on the battery of the target vehicle according to the target battery temperature.

[0092] In a specific implementation, by determining the battery heating temperature with the maximum discharge capacity that meets the user's vehicle power needs, the battery of the target vehicle is controlled to be heated to achieve thermal management control of the battery of the target vehicle.

[0093] This embodiment calculates the battery heating temperature based on the current discharge rate, current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature. Temperatures are filtered based on the current battery temperature, the first battery temperature, battery discharge power conditions, and a temperature-power mapping relationship to obtain multiple second battery temperatures. A target battery temperature is determined based on the first battery temperature and the multiple second battery temperatures. Thermal management control is then performed on the target vehicle's battery based on the target battery temperature. The optimal heating target temperature is determined by comparing the heating boost amount to the heating consumption amount while simultaneously meeting the user's vehicle power requirements. This maximizes the battery assembly's available discharge capacity while meeting the user's vehicle power requirements.

[0094] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above embodiment 1 can be referred to the above introduction and will not be described in detail later. Figure 4 , step S30 in the battery thermal management control method further includes steps S31 to S33:

[0095] Step S31, determining a corresponding target temperature range according to an extreme battery temperature among a plurality of second battery temperatures;

[0096] It can be understood that the extreme battery temperatures include a maximum battery temperature and a minimum battery temperature, and the target temperature range refers to a temperature range corresponding to a plurality of second battery temperatures.

[0097] In a specific implementation, the maximum and minimum battery temperatures among the multiple second battery temperatures are obtained. For example, the multiple second battery temperatures are sorted, and then the maximum and minimum battery temperatures are determined according to the temperature sorting results, and then the temperature ranges corresponding to the multiple second battery temperatures are determined.

[0098] Step S32, comparing the first battery temperature with the target temperature range to obtain a temperature comparison result;

[0099] It can be understood that the temperature comparison result refers to a comparison result of whether the first battery temperature is within a target temperature range.

[0100] In a specific implementation, the first battery temperature is compared with the maximum and minimum battery temperatures corresponding to the target temperature range. When the first battery temperature is greater than or equal to the minimum battery temperature and less than or equal to the maximum battery temperature, it indicates that the first battery temperature is within the target temperature range; when the first battery temperature is less than the minimum battery temperature or greater than the maximum battery temperature, it indicates that the first battery temperature is not within the target temperature range.

[0101] In a feasible implementation manner, step S32 may include steps A321 to A322:

[0102] Step A321: When the temperature comparison result indicates that the first battery temperature is not within the target temperature range, a battery heating temperature is calculated according to the current discharge rate, the current battery temperature, a plurality of second battery temperatures, and a preset discharge capacity strategy to obtain a third battery temperature.

[0103] It can be understood that the third battery temperature refers to the optimal battery heating temperature among the plurality of second battery temperatures.

[0104] In a specific implementation, when the first battery temperature is not within the temperature range corresponding to the multiple second battery temperatures, each second battery temperature is calculated using the formula f(T3)=E3-E1, and the second battery temperature corresponding to the maximum value of f(T3) is taken as the optimal battery heating temperature, that is, the third battery temperature.

[0105] Step A322: Determine the target battery temperature according to the third battery temperature and the battery discharge power condition.

[0106] It is understandable that when solving for the third battery temperature, it is also necessary to verify whether the third battery temperature meets the battery discharge power conditions of F(T, SOC) 60s power ≥ 20kw and F(T, SOC) 10s power ≥ 60kw, and then determine the target battery temperature based on the judgment result.

[0107] In a feasible implementation manner, step A322 may include steps B3221 to B3223:

[0108] Step B3221, determining the battery remaining capacity corresponding to the third battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the third battery temperature;

[0109] It can be understood that the remaining battery capacity refers to the remaining capacity corresponding to heating the battery to the third battery temperature.

[0110] In a specific implementation, the formula of SOC corresponding to the third battery temperature T3 = current SOC - heating energy consumption / theoretical power is used to determine the remaining power corresponding to heating the battery to the third battery temperature. The heating energy consumption refers to the power consumed when heating the battery to the third battery temperature.

[0111] Step B3222: Determine the instantaneous discharge power and the continuous discharge power corresponding to the third battery temperature based on the temperature-power mapping table and the remaining battery capacity corresponding to the third battery temperature.

[0112] It is understandable that the temperature-power mapping table refers to battery discharge power mapping relationships for different battery temperatures and different remaining capacities (including instantaneous discharge power mapping relationships and continuous discharge power mapping relationships).

[0113] In a specific implementation, the mapping relationship between the continuous and instantaneous discharge powers of batteries with different battery temperatures and different remaining capacities is used, and the corresponding discharge power is searched according to the remaining battery capacity corresponding to the third battery temperature to obtain the instantaneous discharge power and continuous discharge power corresponding to the third battery temperature.

[0114] Step B3223: When the instantaneous discharge power and the continuous discharge power corresponding to the third battery temperature meet the battery discharge power condition, determine the third battery temperature as the target battery temperature.

[0115] In a specific implementation, the calculated instantaneous discharge power and continuous discharge power corresponding to the third battery temperature are compared with the battery discharge power condition. For example, the 60s power of F(T, SOC) is set to be ≥20 kW, and the 10s power of F(T, SOC) is set to be ≥60 kW. Therefore, when the instantaneous discharge power corresponding to the third battery temperature is greater than 60 kW and the continuous discharge power corresponding to the third battery temperature is greater than 20 kW, it indicates that the instantaneous discharge power and the continuous discharge power corresponding to the third battery temperature meet the battery discharge power condition. Finally, the third battery temperature is determined as the target battery temperature.

[0116] Step S33 : When the temperature comparison result shows that the first battery temperature is within the target temperature range, determining the first battery temperature as the target battery temperature.

[0117] It can be understood that when the first battery temperature is within the target temperature range, it indicates that the first battery temperature is greater than or equal to the minimum temperature value of the target temperature range and less than or equal to the maximum temperature value of the target temperature range, and thus the first battery temperature is determined to be the target battery temperature.

[0118] It should be noted that since the first battery temperature T2 to be solved is a single value and the second battery temperature T3 to be solved is multiple values, according to the characteristics of the battery cell, there are two situations for T2 and T3: 1. T2∈T3 interval, in which case T2 is the optimal heating exit temperature target; 2. T2<T3 interval, in which case T3 is substituted into f(T) and traversed to obtain the optimal third battery temperature T in the T3 interval. 3_0 . Due to T 3_0 >T2, heat to T 3_0 Energy consumption increases, and heating is updated to T 3_0 SOC, check the map table to check F(T 3_0 , SOC) 60s power ≥ 20kw, F(T 3_0 , SOC) 10s power ≥ 60kw is achieved, if so, then T 3_0 Then it is the optimal heating problem; if not, then heat to T 3_0 The corresponding SOC finds the temperature range T4 that meets the above power requirements (according to the characteristics of the battery itself, any value in the T4 range > T 3_0 ), substitute T4 into f(T) and calculate the best T in the T4 interval 4_0 . Due to T 4_0 >T 3_0 >T2, heat to T 4_0 Energy consumption increases, and heating is updated to T 4_0 SOC, check the map table to check F(T 4_0 , SOC) 60s power ≥ 20kw, F(T 4_0, SOC) 10s power ≥ 60kw is achieved, if so, then T 4_0 Then it is the optimal heating problem. If not, then heat to T 3_0 The corresponding SOC searches for the temperature range T5 corresponding to the above power requirements... until the optimal heating temperature T is found, otherwise the T2 value is used as the optimal heating problem. Finally, the target temperature is the maximum discharge amount that can be increased on the basis of meeting the user's vehicle power requirements.

[0119] This embodiment determines a corresponding target temperature range based on the extreme battery temperatures among multiple second battery temperatures; compares the first battery temperature with the target temperature range to obtain a temperature comparison result; and determines the first battery temperature as the target battery temperature when the temperature comparison result indicates that the first battery temperature is within the target temperature range. By comparing the first battery temperature with the target temperature range and determining the first battery temperature as the target battery temperature when the first battery temperature is within the target temperature range, the effective low-temperature discharge capacity of the battery assembly is increased.

[0120] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the battery thermal management control method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0121] This application also provides a battery thermal management control device, please refer to Figure 5 , the battery thermal management control device includes:

[0122] a calculation module 10, configured to calculate a battery heating temperature according to a current discharge rate, a current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature;

[0123] a screening module 20, configured to perform temperature screening according to the current battery temperature, the first battery temperature, and a battery discharge power condition to obtain a plurality of second battery temperatures;

[0124] The calculation module 10 is further configured to determine a target battery temperature based on the first battery temperature and a plurality of second battery temperatures;

[0125] The control module 30 is configured to perform thermal management control on the battery of the target vehicle according to the target battery temperature.

[0126] Optionally, the calculation module 10 is further configured to:

[0127] Compare the current battery temperature with the discharge temperature of each battery in the preset discharge capacity strategy to obtain the target discharge temperature;

[0128] Calculating heating consumption energy according to the current battery temperature and the target discharge temperature to obtain battery heating energy;

[0129] The battery heating temperature is calculated according to the current discharge rate, the current battery temperature, a preset discharge capacity strategy, the target discharge temperature, and the battery heating energy to obtain a first battery temperature.

[0130] Optionally, the calculation module 10 is further configured to:

[0131] determining, according to a current discharge rate, the current battery temperature, a preset discharge capacity strategy, and the target discharge temperature, a discharge capacity corresponding to the current battery temperature and a discharge capacity corresponding to the target discharge temperature;

[0132] determining a target capacity difference according to the battery heating energy, the discharge capacity corresponding to the current battery temperature, and the discharge capacity corresponding to the target discharge temperature;

[0133] The first battery temperature is determined according to a target discharge temperature corresponding to the target capacity difference.

[0134] Optionally, the screening module 20 is further configured to:

[0135] determining a battery remaining capacity corresponding to the first battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the first battery temperature;

[0136] Temperature screening is performed according to the battery remaining capacity, battery discharge power condition, and temperature-power mapping relationship corresponding to the first battery temperature to obtain multiple second battery temperatures.

[0137] Optionally, the calculation module 10 is further configured to:

[0138] determining a corresponding target temperature range according to an extreme battery temperature among the plurality of second battery temperatures;

[0139] Comparing the first battery temperature with the target temperature range to obtain a temperature comparison result;

[0140] When the temperature comparison result shows that the first battery temperature is within the target temperature range, the first battery temperature is determined to be the target battery temperature.

[0141] Optionally, the calculation module 10 is further configured to:

[0142] When the temperature comparison result shows that the first battery temperature is not within the target temperature range, calculating a battery heating temperature according to the current discharge rate, the current battery temperature, a plurality of second battery temperatures, and a preset discharge capacity strategy to obtain a third battery temperature;

[0143] The target battery temperature is determined according to the third battery temperature and the battery discharge power condition.

[0144] Optionally, the calculation module 10 is further configured to:

[0145] determining the remaining battery capacity corresponding to the third battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the third battery temperature;

[0146] determining an instantaneous discharge power and a continuous discharge power corresponding to the third battery temperature according to the temperature-power mapping table and the remaining battery power corresponding to the third battery temperature;

[0147] When the instantaneous discharge power and the continuous discharge power corresponding to the third battery temperature meet a battery discharge power condition, the third battery temperature is determined as the target battery temperature.

[0148] The battery thermal management control device provided in this application, employing the battery thermal management control method described in the aforementioned embodiments, can address the technical problem of maximizing the available discharge capacity of a battery assembly while meeting user vehicle usage needs. Compared to the prior art, the battery thermal management control device provided in this application achieves the same beneficial effects as the battery thermal management control method described in the aforementioned embodiments. Other technical features of the battery thermal management control device are the same as those disclosed in the aforementioned embodiments and are not further elaborated here.

[0149] The present application provides a battery thermal management control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the battery thermal management control method in the above-mentioned embodiment 1.

[0150] Reference below Figure 6 , which shows a schematic structural diagram of a battery thermal management control device suitable for implementing an embodiment of the present application. The battery thermal management control device in the embodiment of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6 The battery thermal management control device shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0151] like Figure 6 As shown, the battery thermal management control device may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the battery thermal management control device. Processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage device 1003 including, for example, a magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 can allow the battery thermal management control device to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a battery thermal management control device with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0152] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0153] The battery thermal management control device provided in this application, employing the battery thermal management control method described in the aforementioned embodiment, can address the technical problem of maximizing the available discharge capacity of a battery assembly while meeting user vehicle usage needs. Compared to the prior art, the battery thermal management control device provided in this application achieves the same beneficial effects as the battery thermal management control method described in the aforementioned embodiment. Other technical features of the battery thermal management control device are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0154] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0155] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0156] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, wherein the computer-readable program instructions are used to execute the battery thermal management control method in the above-mentioned embodiment.

[0157] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0158] The computer-readable storage medium may be included in the battery thermal management control device; or may exist independently without being assembled into the battery thermal management control device.

[0159] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the battery thermal management control device, the battery thermal management control device: calculates the battery heating temperature according to the current discharge rate, the current battery temperature and the preset discharge capacity strategy to obtain a first battery temperature; performs temperature screening according to the current battery temperature, the first battery temperature, the battery discharge power condition and the temperature-power mapping relationship to obtain multiple second battery temperatures; determines a target battery temperature according to the first battery temperature and the multiple second battery temperatures; and performs thermal management control on the battery of the target vehicle according to the target battery temperature.

[0160] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0161] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0162] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0163] The computer-readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned battery thermal management control method. This computer-readable storage medium addresses the technical problem of maximizing the available discharge capacity of a battery assembly while meeting user vehicle usage needs. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the battery thermal management control method provided in the aforementioned embodiments, and are not further elaborated here.

[0164] The present application also provides a computer program product, including a computer program, which implements the steps of the battery thermal management control method as described above when the computer program is executed by a processor.

[0165] The computer program product provided in this application can solve the technical problem of maximizing the available discharge capacity of a battery assembly while meeting user vehicle requirements. Compared to existing technologies, the beneficial effects of the computer program product provided in this application are similar to those of the battery thermal management control method provided in the aforementioned embodiments, and are not further elaborated here.

[0166] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery thermal management control method, characterized in that: The battery thermal management control method includes: Calculating a battery heating temperature according to a current discharge rate, a current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature, wherein the preset discharge capacity strategy is a mapping relationship between discharge capacities at different temperatures and discharge rates; performing temperature screening according to the current battery temperature, the first battery temperature, a battery discharge power condition, and a temperature-power mapping relationship to obtain a plurality of second battery temperatures, the temperature-power mapping relationship including a battery temperature-continuous discharge power mapping relationship and a battery temperature-instantaneous discharge power mapping relationship; determining a target battery temperature according to the first battery temperature and a plurality of the second battery temperatures; Thermal management control is performed on a battery of a target vehicle according to the target battery temperature.

2. The method according to claim 1, wherein The calculating the battery heating temperature according to the current discharge rate, the current battery temperature, and the preset discharge capacity strategy to obtain the first battery temperature includes: Compare the current battery temperature with the discharge temperature of each battery in the preset discharge capacity strategy to obtain the target discharge temperature; Calculating heating consumption energy according to the current battery temperature and the target discharge temperature to obtain battery heating energy; The battery heating temperature is calculated according to the current discharge rate, the current battery temperature, a preset discharge capacity strategy, the target discharge temperature, and the battery heating energy to obtain a first battery temperature.

3. The method according to claim 2, wherein The calculating the battery heating temperature according to the current discharge rate, the current battery temperature, a preset discharge capacity strategy, the target discharge temperature, and the battery heating energy to obtain the first battery temperature includes: determining, according to a current discharge rate, the current battery temperature, a preset discharge capacity strategy, and the target discharge temperature, a discharge capacity corresponding to the current battery temperature and a discharge capacity corresponding to the target discharge temperature; determining a target capacity difference according to the battery heating energy, the discharge capacity corresponding to the current battery temperature, and the discharge capacity corresponding to the target discharge temperature; The first battery temperature is determined according to a target discharge temperature corresponding to the target capacity difference.

4. The method according to claim 1, wherein The performing temperature screening according to the current battery temperature, the first battery temperature, the battery discharge power condition, and the temperature-power mapping relationship to obtain multiple second battery temperatures includes: determining a battery remaining capacity corresponding to the first battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the first battery temperature; Temperature screening is performed according to the battery remaining capacity, battery discharge power condition, and temperature-power mapping relationship corresponding to the first battery temperature to obtain multiple second battery temperatures.

5. The method according to claim 1, wherein The determining the target battery temperature according to the first battery temperature and a plurality of second battery temperatures includes: determining a corresponding target temperature range according to an extreme battery temperature among the plurality of second battery temperatures; Comparing the first battery temperature with the target temperature range to obtain a temperature comparison result; When the temperature comparison result shows that the first battery temperature is within the target temperature range, the first battery temperature is determined to be the target battery temperature.

6. The method according to claim 5, wherein After comparing the first battery temperature with the target temperature range to obtain a temperature comparison result, the method further includes: When the temperature comparison result shows that the first battery temperature is not within the target temperature range, calculating a battery heating temperature according to the current discharge rate, the current battery temperature, a plurality of second battery temperatures, and a preset discharge capacity strategy to obtain a third battery temperature; The target battery temperature is determined according to the third battery temperature and the battery discharge power condition.

7. The method according to claim 6, wherein The determining the target battery temperature according to the third battery temperature and the battery discharge power condition includes: determining the remaining battery capacity corresponding to the third battery temperature based on the discharge capacity corresponding to the current battery temperature and the battery heating energy corresponding to the third battery temperature; determining an instantaneous discharge power and a continuous discharge power corresponding to the third battery temperature according to the temperature-power mapping table and the remaining battery power corresponding to the third battery temperature; When the instantaneous discharge power and the continuous discharge power corresponding to the third battery temperature meet a battery discharge power condition, the third battery temperature is determined as the target battery temperature.

8. A battery thermal management control device, characterized in that: The device comprises: a calculation module, configured to calculate a battery heating temperature based on a current discharge rate, a current battery temperature, and a preset discharge capacity strategy to obtain a first battery temperature, wherein the preset discharge capacity strategy is a mapping relationship between discharge capacities at different temperatures and discharge rates; a screening module, configured to perform temperature screening based on the current battery temperature, the first battery temperature, a battery discharge power condition, and a temperature-power mapping relationship to obtain a plurality of second battery temperatures, the temperature-power mapping relationship including a battery temperature-continuous discharge power mapping relationship and a battery temperature-instantaneous discharge power mapping relationship; The calculation module is further configured to determine a target battery temperature based on the first battery temperature and a plurality of second battery temperatures; A control module is used to perform thermal management control on a battery of a target vehicle according to the target battery temperature.

9. A battery thermal management control device, characterized in that: The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the battery thermal management control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the battery thermal management control method according to any one of claims 1 to 7 are implemented.

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