Battery thermal management strategy determination method and device, equipment, medium and vehicle

Abstract

The invention discloses a battery thermal management strategy determination method, device and equipment, a medium and a vehicle, a plurality of working conditions of a battery and battery body heating power corresponding to each working condition are determined, temperature rise corresponding to each working condition is determined in sequence according to a descending order of closeness of the working conditions and a preset charging cut-off working condition, and the battery thermal management strategy is determined according to the temperature rise. And determining a first working condition in which the sum value of the set temperature included in the plurality of working conditions and the corresponding temperature rise is greater than the maximum temperature, and determining a cooling power starting temperature threshold corresponding to each set SOC in the plurality of working conditions according to the set temperature included in the first working condition. According to the embodiment, the cooling power starting temperature threshold values corresponding to the multiple set SOCs can be determined, transient thermal management of the battery can be achieved based on the cooling power starting temperature threshold values corresponding to the multiple set SOCs, and compared with a traditional method for determining thermal management based on an initial working condition for thermal management, transient thermal management is more accurate, and the reliability of thermal management is improved. And the battery charging rate can be effectively improved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery thermal management, and in particular, relates to a method, device, equipment, medium and vehicle for determining a battery thermal management strategy. Background Art

[0002] As a carrier of new energy, batteries are gradually being widely used. For example, in new energy vehicles, batteries are usually one of the core components that provide power. The charging performance of batteries is directly related to the user experience, and fast charging of batteries is one of the important means to solve the range anxiety of new energy vehicles. Since batteries charge at different rates under different temperature conditions, in order to increase the charging rate of batteries, thermal management of batteries is usually performed during the battery charging process.

[0003] In the current technical solution, it is usually necessary to classify the initial operating conditions of the battery, and then assign the corresponding thermal management strategy based on the allowable charging capacity of the battery cell in the initial operating conditions. However, in fact, the fast charging of the battery is a process in which the operating conditions change rapidly, so the fastest charging path, that is, the charging path with the fastest charging speed, also has real-time changes in the demand for thermal management. Therefore, the current technical solution determines the thermal management strategy based on the initial operating conditions, resulting in an inaccurate thermal management strategy and a low charging rate. Summary of the invention

[0004] The embodiments of the present application provide a method, device, equipment, medium and vehicle for determining a battery thermal management strategy, which can improve the problem of inaccurate battery thermal management strategy and help improve battery charging efficiency.

[0005] In a first aspect, an embodiment of the present application provides a method for determining a battery thermal management strategy, comprising:

[0006] Determine multiple operating conditions of the battery and the allowable charging rate corresponding to each operating condition, each operating condition includes a set state of charge SOC and a set temperature, different operating conditions include different set states of charge SOC and / or set temperatures, the set temperature includes the temperature of the battery and / or the temperature of the environment in which the battery is located;

[0007] For each operating condition, determine the heat generation power of the battery body when the battery is charged under the operating condition according to the allowable charging rate under the operating condition;

[0008] Determine the temperature rise corresponding to each of the multiple operating conditions in descending order of proximity between the operating condition and the preset charge cut-off operating condition, wherein the charge cut-off operating condition includes a charge cut-off SOC and a maximum temperature, and the temperature rise corresponding to the operating condition is used to indicate the battery temperature change amount when the battery is charged from the operating condition to the charge cut-off SOC, and the temperature rise is determined based on the heat generation power of the battery body corresponding to the operating condition and the thermal management power required in the process of charging from the operating condition to the charge cut-off SOC;

[0009] Determine a first operating condition among the multiple operating conditions, the first operating condition being an operating condition in which the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature;

[0010] According to the set temperature included in the first operating condition, a cooling power start temperature threshold corresponding to each set SOC in the multiple operating conditions is determined respectively.

[0011] In a second aspect, an embodiment of the present application provides a battery thermal management strategy determination device, comprising:

[0012] A determination module, used to determine multiple operating conditions of the battery and an allowable charging rate corresponding to each operating condition, each operating condition includes a set state of charge SOC and a set temperature, different operating conditions include different set states of charge SOC and / or set temperatures, and the set temperature includes the temperature of the battery and / or the temperature of the environment in which the battery is located;

[0013] A power determination module is used to determine the heating power of the battery body when the battery is charged under each operating condition according to the allowable charging rate under the operating condition;

[0014] a temperature rise determination module, used to determine the temperature rise corresponding to each of the multiple operating conditions in descending order of proximity between the operating condition and the preset charge cut-off operating condition, wherein the charge cut-off operating condition includes a charge cut-off SOC and a maximum temperature, and the temperature rise corresponding to the operating condition is used to indicate the battery temperature change amount when the battery is charged from the operating condition to the charge cut-off SOC, and the temperature rise is determined based on the battery body heating power corresponding to the operating condition and the thermal management power required in the process of charging from the operating condition to the charge cut-off SOC;

[0015] A first operating condition determination module, used to determine a first operating condition among multiple operating conditions, the first operating condition refers to an operating condition in which the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature;

[0016] The cooling threshold determination module is used to determine the cooling power start temperature threshold corresponding to each set SOC in multiple working conditions according to the set temperature included in the first working condition.

[0017] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: a processor and a memory storing computer program instructions;

[0018] When the processor executes the computer program instructions, the steps of the battery thermal management strategy determination method according to the first aspect are implemented.

[0019] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the steps of the method for determining a battery thermal management strategy as in the first aspect are implemented.

[0020] In a fifth aspect, an embodiment of the present application provides a vehicle, comprising a battery thermal management strategy determination device as in the second aspect.

[0021] The battery thermal management strategy determination method, device, equipment, medium and vehicle of the embodiment of the present application determine multiple working conditions of the battery and the allowable charging rate corresponding to each working condition. For each working condition, according to the allowable charging rate under the working condition, the battery body heat power when the battery is charged under the working condition is determined. According to the order of the proximity between the working condition and the preset charging cut-off working condition from large to small, the temperature rise corresponding to each working condition in the multiple working conditions is determined in turn, and the first working condition in the multiple working conditions is determined. The first working condition refers to the working condition in which the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature. According to the set temperature included in the first working condition, the cooling power opening temperature threshold corresponding to each set SOC in the multiple working conditions is determined respectively. According to the present embodiment, by analyzing the temperature change of the battery when charging under multiple working conditions, the cooling power opening temperature threshold corresponding to each set SOC is determined. Based on the cooling power opening temperature threshold corresponding to each set SOC, transient thermal management of the battery can be achieved. Compared with the traditional thermal management strategy based on the initial working condition, transient thermal management has higher precision and accuracy, and can effectively improve the battery charging rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 It is a flow chart of a method for determining a battery thermal management strategy provided in an embodiment of the present application;

[0024] Figure 2 is a schematic diagram of a battery performance parameter table corresponding to multiple operating conditions provided in an embodiment of the present application;

[0025] Figure 3 It is a schematic diagram of a battery body heating power table corresponding to multiple working conditions provided in an embodiment of the present application;

[0026] Figure 4 It is a schematic diagram showing the heating power corresponding to multiple working conditions provided in the embodiments of the present application;

[0027] Figure 5 It is a schematic diagram of thermal management power corresponding to multiple working conditions provided in the embodiment of the present application;

[0028] Figure 6 It is a flow chart of a battery thermal management method provided in an embodiment of the present application;

[0029] Figure 7 It is a structural schematic diagram of a battery thermal management strategy determination device provided in an embodiment of the present application;

[0030] Figure 8 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0034] Battery fast charging is a process in which the operating conditions change rapidly. The demand for thermal management of the fastest charging path also changes in real time. A more efficient thermal management solution needs to be implemented through a transient thermal management strategy. Since different types of batteries have different optimal operating temperature ranges and different fastest charging paths, the embodiments of the present application provide a general method for determining a transient thermal management strategy for a battery. During the battery fast charging process, thermal management is performed based on the thermal management strategy determined by the battery thermal management strategy determination method provided in the embodiments of the present application, and the fastest charging process of the power battery can be achieved under any starting conditions.

[0035] The goal of transient thermal management of batteries is to manage battery temperature, which is essentially to manage power. In this embodiment, the battery refers to a battery pack, which usually includes multiple single cells. There may also be differences between different single cells in the same battery pack. This means that when charging the battery pack, the thermal management solution shared by the entire pack of batteries cannot put each single cell on a unified charging path. In view of this, in order to limit the charging path of all single cells to the optimal charging range, the embodiment of the present application determines the transient thermal management strategy by exploring the range boundary of the optimal charging path. In other words, the boundary of the thermal management strategy determined based on the embodiment of the present application (that is, the thermal management threshold) is the envelope of the optimal charging path of all single cells in the battery pack.

[0036] In order to determine the thermal management threshold that puts all single cells in the battery pack in the optimal charging range, the embodiment of the present application adopts the bottom-line principle to determine the thermal management threshold. Currently, thermal management generally includes both heating and cooling methods. Therefore, the thermal management threshold may include a cooling power start-up temperature threshold and / or a heating power start-up temperature threshold.

[0037] The bottom-line principle adopted in the embodiments of the present application mainly includes the following three factors:

[0038] 1. During the entire charging process, the battery is within the safe operating temperature range;

[0039] 2. During the charging process, the battery stays within the optimal operating temperature boundary for the longest time;

[0040] 3. When the battery is within the optimal working boundary for the same length of time, the battery thermal management energy consumption is the lowest.

[0041] Based on the above three factors, three basic principles for determining transient thermal management strategies are given:

[0042] 1. The battery temperature is controlled within the safety limit during the entire charging process;

[0043] 2. During the charging process, the power battery should enter its optimal operating temperature range as soon as possible;

[0044] 3. When the battery is already in the optimal operating range, the target operating condition for the end of charging is that the battery is fully charged and the end temperature does not exceed the maximum allowed temperature. The maximum temperature can be set according to actual conditions, for example, 50°C.

[0045] Based on the above principles, embodiments of the present application provide a method, apparatus, device, storage medium and vehicle for determining a battery thermal management strategy.

[0046] See also Figure 1 , is a flow chart of a method for determining a battery thermal management strategy provided in an embodiment of the present application, such as Figure 1As shown, the method may include the following steps S11-S16.

[0047] S11. Determine multiple operating conditions of the battery and the allowable charging rate corresponding to each operating condition, each operating condition includes a set state of charge SOC and a set temperature, different operating conditions include different set states of charge SOC and / or set temperatures, the set temperature includes the temperature of the battery and / or the temperature of the environment in which the battery is located.

[0048] Among them, multiple operating conditions of the battery can be set according to actual needs, usually some common battery operating conditions.

[0049] In some embodiments of the present application, when determining multiple operating conditions, the battery's commonly used SOC range and temperature range can be determined first (the temperature range can be a battery temperature range or an ambient temperature range of the battery's environment), and then multiple SOCs are selected from the SOC range as set SOCs, and multiple temperatures are selected from the temperature range as set temperatures, and then the multiple set SOCs and multiple set temperatures are arranged and combined to obtain multiple operating conditions.

[0050] The charging rate is a measure of charging speed, which refers to the current value required to charge the battery to its rated capacity in a specified time. The allowable charging rate corresponding to each operating condition is the charging rate allowed under that operating condition, which can be obtained from the battery parameters.

[0051] As an example, multiple operating conditions are determined based on the SOC range of 0%-97% SOC and the common temperature range of -20℃-50℃, see Figure 2 , is a schematic diagram of a battery performance parameter table corresponding to multiple operating conditions provided in this embodiment, wherein the parameter table includes a set SOC, a set temperature, and a corresponding allowable charging rate for each operating condition, wherein the parameter value in the first row is the set SOC, the parameter value in the second column is the set temperature, and the remaining parameter values ​​except the set SOC and the set temperature are the allowable charging rates, and the area within the dotted box corresponds to the optimal operating range of the battery performance.

[0052] S12. For each operating condition, determine the heat generation power of the battery body when the battery is charged under the operating condition according to the allowable charging rate under the operating condition.

[0053] The heat generation power of the battery itself refers to the heat generation power of the battery itself without thermal management, also known as intrinsic heat generation power.

[0054] At present, there are mature technologies for determining the heat generation power of the battery during charging based on the charging rate, including but not limited to experimental calibration, using the power calculation formula, i.e., I 2R calculation, calculation using entropy thermal coefficient, and calculation using equivalent circuit models, etc. This embodiment can use any of these technologies to determine the body heating power of the battery under various operating conditions.

[0055] As an example, using the power calculation formula I 2 Taking the calculation of the heating power of the battery body under the R working condition as an example, replace I in the formula with the allowable charging rate corresponding to the working condition, and replace R with the internal resistance of the battery. In this way, the heating power of the battery body corresponding to the working condition can be obtained through calculation.

[0056] See also Figure 3 , for Figure 2 A schematic diagram of a battery body heating power table corresponding to multiple operating conditions in the figure, wherein the table includes the set SOC, set temperature and corresponding battery body heating power for each operating condition, wherein the parameter value in the first row is the set SOC, the parameter value in the second column is the set temperature, and the remaining parameter values ​​except the set SOC and the set temperature are the battery body heating power.

[0057] S13. Determine the temperature rise corresponding to each of the multiple operating conditions in order of proximity between the operating condition and the preset charging cut-off operating condition from large to small, wherein the charging cut-off operating condition includes the charging cut-off SOC and the maximum temperature, and the temperature rise corresponding to the operating condition is used to indicate the battery temperature change from the operating condition to the charging cut-off SOC, and the temperature rise is determined based on the battery body heat generation power corresponding to the operating condition and the thermal management power during the charging process from the operating condition to the charging cut-off SOC.

[0058] The battery charging cut-off condition can be set according to actual conditions.

[0059] To avoid overcharging of the battery, the charge cutoff SOC may be close to and less than 100% SOC, for example, 97% SOC.

[0060] In order to prevent the battery from charging too slowly due to low temperature and to avoid damage to the battery due to high temperature, the maximum temperature can be set at around 45°C to 55°C. Based on the principle that the battery temperature is controlled within the safety boundary during the entire charging process, the maximum temperature can be the upper limit of the battery's safe operating temperature range, such as 50°C, where the battery's safe operating temperature range can be the battery temperature range or the ambient temperature range, and needs to be consistent with the set temperature in the working condition, that is, if the set temperature in the working condition is the battery's own temperature, then the maximum temperature also refers to the battery's own temperature, and if the set temperature in the working condition is the ambient temperature, then the maximum temperature is also the ambient temperature.

[0061] In this embodiment, the latest temperature for starting cooling at each set SOC, that is, the cooling power start temperature threshold corresponding to each set SOC, is determined by a reverse deduction method.

[0062] During the charging process, the operating condition of the battery changes in real time and is getting closer and closer to the charging cut-off condition. Reverse reasoning can be understood as calculating each operating condition in turn in the direction opposite to the direction of change of the operating condition during charging, that is, calculating each operating condition in the multiple operating conditions in order from large to small in terms of the closeness between the operating condition and the charging cut-off condition, where the greater the degree of closeness, the closer they are.

[0063] The magnitude of the proximity between the operating condition and the charging cut-off operating condition can be determined based on a first difference between the set SOC in the operating condition and the charging cut-off SOC, and a second difference between the set temperature in the operating condition and the maximum temperature. For multiple operating conditions, when determining the magnitude relationship between the proximity corresponding to the multiple operating conditions, first determine the first difference corresponding to each operating condition, wherein the smaller the first difference, the greater the corresponding proximity, and for operating conditions with the same first difference, then determine the second difference, wherein the smaller the second difference, the greater the corresponding proximity.

[0064] As an example, Figure 2 Taking the multiple operating conditions shown as an example, for the convenience of description, the following form of (set temperature, set SOC) is used to represent each operating condition. When the charging cut-off condition is (50°C, 97% SOC), among the multiple operating conditions, the one closest to the charging cut-off condition is (50°C, 97% SOC), followed by (45°C, 97% SOC), and then (40°C, 97% SOC), and so on. (50°C, 90% SOC) comes after (-20°C, 97% SOC).

[0065] For each operating condition, when determining its corresponding temperature rise, determine whether there is an operating condition that requires cooling in the previously calculated operating condition, where the operating condition that requires cooling refers to the operating condition where charging from the operating condition to the charging cut-off SOC will cause the battery temperature to exceed the maximum temperature. If there is an operating condition that requires cooling in the previously calculated operating condition, then when determining the temperature rise corresponding to the current operating condition, the battery body heating power and the thermal management power used for cooling corresponding to the current operating condition need to be considered, because during the process of charging from the current operating condition to the charging cut-off condition, the operating condition changes in real time, that is, this process will pass through the previously calculated operating condition, so if the previously calculated operating condition requires cooling, then during this charging process, the thermal management power used for cooling needs to be considered. If there is no operating condition that requires cooling in the previously calculated operating condition, then when determining the temperature rise corresponding to the current operating condition, it is considered that the thermal management power required during the process from charging from the operating condition to the charging cut-off SOC is 0, so the temperature rise corresponding to the current operating condition can be calculated based only on the battery body heating power corresponding to the current operating condition.

[0066] S14. Determine a first operating condition among multiple operating conditions, where the first operating condition refers to an operating condition in which the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature.

[0067] Among them, the first operating condition is also the operating condition mentioned above that requires turning on cooling. Determining the first operating condition among multiple operating conditions here refers to determining all operating conditions among multiple operating conditions that meet the condition that the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature, and all determined operating conditions are determined as the first operating condition.

[0068] The method of determining whether an operating condition is the first operating condition includes: adding the set temperature included in the operating condition and the temperature rise corresponding to the operating condition, and determining the sum obtained by the addition as the battery temperature prediction value when the battery is charged from the operating condition to the charging cut-off SOC. If the battery temperature prediction value is greater than the maximum temperature, it violates the principle of "the battery temperature is controlled within the safety boundary throughout the charging process". Therefore, in order not to violate this principle, when the battery temperature prediction value corresponding to the operating condition is greater than the maximum temperature, it is determined that cooling needs to be turned on under the operating condition, and then the operating condition is determined to be the first operating condition.

[0069] S15. According to the set temperature included in the first operating condition, determine the cooling power start temperature threshold corresponding to each set SOC in multiple operating conditions.

[0070] In some embodiments of the present application, Figure 2 As shown, the multiple operating conditions include 5% SOC, 10% SOC, 15% SOC, 20% SOC, 25% SOC, 30% SOC, 40% SOC, 45% SOC, 50% SOC, 55% SOC, 60% SOC, 65% SOC, 70% SOC, 75% SOC, 80% SOC, 85% SOC, 90% SOC and 97% SOC, a total of 18 set SOCs. Therefore, according to the set temperature included in the first operating condition, the cooling power start-up temperature threshold corresponding to each of the 18 set SOCs can be determined respectively.

[0071] The battery thermal management strategy determination method provided in this embodiment determines multiple operating conditions of the battery and the allowable charging rate corresponding to each operating condition. For each operating condition, according to the allowable charging rate under the operating condition, the battery body heat power when the battery is charged under the operating condition is determined. According to the order of the proximity between the operating condition and the preset charging cut-off operating condition from large to small, the temperature rise corresponding to each operating condition in the multiple operating conditions is determined in turn, and the first operating condition in the multiple operating conditions is determined. The first operating condition refers to the operating condition in which the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature. According to the set temperature included in the first operating condition, the cooling power opening temperature threshold corresponding to each set SOC in the multiple operating conditions is determined respectively. According to this embodiment, by analyzing the temperature change of the battery when charging under multiple operating conditions, the cooling power opening temperature threshold corresponding to each set SOC is determined. Based on the cooling power opening temperature threshold corresponding to each set SOC, transient thermal management of the battery can be achieved. Compared with the traditional thermal management strategy based on the initial operating condition, transient thermal management has higher precision and accuracy, and can effectively improve the battery charging rate.

[0072] In some embodiments, according to the set temperature included in the first operating condition, determining the cooling power start-up temperature threshold corresponding to each set SOC may include:

[0073] For each SOC setting, perform the following steps:

[0074] Determine a second operating condition including the set SOC in the first operating condition;

[0075] Determining a minimum set temperature value included in the second operating condition;

[0076] The set temperature minimum value is determined as the cooling power start temperature threshold corresponding to the set SOC.

[0077] Determining the second operating condition including the set SOC in the first operating condition refers to determining all operating conditions including the set SOC in the first operating condition, and determining all the determined operating conditions as the second operating condition corresponding to the set SOC.

[0078] The cooling power start-up temperature threshold determined based on the above method is the envelope of the cooling power start-up temperature thresholds of all single cells in the battery. Based on this, thermal management is performed based on the cooling power start-up temperature thresholds corresponding to each set SOC determined based on the above method, which can prevent all single cells in the battery from having a temperature greater than the maximum temperature.

[0079] In some embodiments, in addition to cooling the battery, the battery thermal management can also heat the battery. Therefore, when determining the battery thermal management strategy, the heating power start temperature threshold corresponding to each set SOC can also be determined. Specifically, before determining the temperature rise corresponding to each of the multiple operating conditions in descending order of proximity between the operating condition and the charging cut-off condition, the following steps can be performed:

[0080] Determine the maximum charging rate corresponding to each working condition respectively;

[0081] Determining a third operating condition among the plurality of operating conditions, the third operating condition comprising a temperature less than a maximum temperature, and an allowable charging rate corresponding to the third operating condition less than a corresponding maximum charging rate;

[0082] According to the set temperature included in the third operating condition, the heating start temperature threshold corresponding to each set SOC is determined respectively.

[0083] Among them, the maximum charging rate corresponding to each operating condition can be determined based on battery parameters.

[0084] In the embodiment of the present application, determining the third operating condition among multiple operating conditions refers to determining all operating conditions among the multiple operating conditions that satisfy the condition that the temperature is less than the maximum temperature and the corresponding allowable charging rate is less than the corresponding maximum charging rate, and all determined operating conditions are determined as the third operating condition.

[0085] As an example, for Figure 2 For each of the multiple operating conditions shown, whether the operating condition is the third operating condition can be determined based on the following formula:

[0086]

[0087] in, represents the heating power of thermal management corresponding to the working condition (i, j), and the working condition (i, j) refers to Figure 2 The parameter table shown in FIG. 1 shows the operating conditions composed of the set temperature of the i-th row and the set SOC of the j-th column. With i being 1 and j being 2, the operating condition (i, j) is the operating condition (-20°C, 10%). 7 refers to the heating power, which is only an example. Depending on the structure of the thermal management system used, the heating power may also be different. C i,j Indicates the allowable charging rate corresponding to the working condition (i, j), Indicates the maximum charging rate corresponding to the working condition (i, j). Figure 2 As shown in the figure, for the operating condition of i<13, the set temperature contained in it is less than 50℃. Usually, within the safe operating temperature range, the higher the temperature, the faster the charging rate. Therefore, for this operating condition, if the allowable charging rate is less than the maximum charging rate, that is, In order to further increase the charging rate, it can be heated, that is, the heating power is turned on, so the corresponding heating power is 7. For the working condition of i≥13, the set temperature is greater than or equal to 50℃. If it is heated again, the battery temperature will exceed the maximum temperature of 50℃. Therefore, it cannot be heated. Therefore, the heating power corresponding to this working condition is 0. In addition, for the working condition where the allowable charging rate is greater than or equal to the maximum charging rate, that is If heating is performed, the allowable charging rate will be greater than the maximum charging rate, so heating is not allowed. The heating power corresponding to this working condition is 0.

[0088] As an example, see Figure 4 ,for Figure 2 The heating power corresponding to multiple working conditions in the table is shown schematically, and the table includes the set SOC, set temperature and corresponding heating power for each working condition. The parameter value in the first row is the set SOC, the parameter value in the second column is the set temperature, and the remaining parameter values ​​except the set SOC and set temperature are the heating power. The working conditions with a heating power of 7 are all the third working condition. Figure 4 As shown, there are usually multiple third operating conditions under the same set SOC. Based on this, the heating power start-up temperature threshold corresponding to each set SOC can be determined separately to envelop the corresponding heating power start-up temperature thresholds of all single cells in the battery.

[0089] In some embodiments, according to the set temperature included in the third operating condition, determining the heating power start temperature threshold corresponding to each set SOC in the multiple operating conditions may include:

[0090] For each set SOC, perform the following steps:

[0091] Determine a fifth operating condition including the set SOC in the third operating condition;

[0092] Determine the maximum set temperature included in the fifth operating condition;

[0093] The set temperature maximum value is determined as the heating power start temperature threshold corresponding to the set SOC.

[0094] Determining the fifth operating condition in the third operating condition that includes the set SOC refers to determining all operating conditions in the third operating condition that include the set SOC, and determining all determined operating conditions as the fifth operating condition corresponding to the set SOC.

[0095] The heating power start-up temperature threshold for each set SOC determined in the above manner can envelop the corresponding heating power start-up temperature threshold for all single cells in the battery. Thermal management of the battery based on the heating power start-up temperature threshold and the cooling power start-up temperature threshold for each set SOC can limit the charging path of all single cells in the battery to the optimal charging range, thereby improving the battery charging efficiency.

[0096] In some embodiments, determining the temperature rise corresponding to each of the multiple operating conditions in descending order of proximity between the operating condition and the charging cut-off operating condition may include:

[0097] The remaining working conditions after removing the third working condition from the plurality of working conditions are used as the fourth working condition;

[0098] The temperature rise corresponding to each operating condition in the fourth operating condition is determined in order from large to small according to the closeness of the operating condition to the charging cut-off operating condition.

[0099] Herein, taking the operating conditions remaining after removing the third operating condition from the multiple operating conditions as the fourth operating condition means that all the operating conditions remaining after removing all the third operating conditions from the multiple operating conditions are determined as the fourth operating condition.

[0100] Because based on the above process it has been determined that the third operating condition is a condition that requires heating, and it is impossible to heat and cool at the same time, so it is impossible to cool under the third operating condition. Therefore, when determining the cooling power start threshold, there is no need to consider the third operating condition, only the fourth operating condition needs to be analyzed, which can reduce the workload.

[0101] In some embodiments, determining the temperature rise corresponding to each operating condition in the fourth operating condition in descending order of proximity between the operating condition and the charging cut-off operating condition may include:

[0102] For each operating condition in the fourth operating condition, when determining the temperature rise corresponding to the operating condition, determining whether the operating condition preceding the operating condition in the sequence includes the first operating condition;

[0103] When the operating condition preceding the operating condition does not include the first operating condition, the heating power of the battery body corresponding to the operating condition is taken as the total heating power corresponding to the operating condition;

[0104] In the case where the operating condition preceding the operating condition includes the first operating condition, the sum of the heating power of the battery body corresponding to the operating condition and the preset cooling power is used as the total heating power corresponding to the operating condition;

[0105] The temperature rise corresponding to the working condition is determined according to the total heating power corresponding to the working condition.

[0106] As an example, Figure 4As an example, the corresponding operating condition with a heating power of 0 is the fourth operating condition, and the order of the closeness between the operating condition and the charging cut-off condition from large to small is Figure 4 The order indicated by the arrows in the figure, where the arrows point from greater proximity to less proximity.

[0107] For each operating condition in the fourth operating condition, when determining the corresponding temperature rise, it is determined whether the operating condition preceding the operating condition in the order includes the first operating condition, that is, whether there is an operating condition that requires cooling to be turned on in the operating conditions calculated in the previous order. If it is determined that the first operating condition exists, the temperature rise corresponding to the current operating condition is determined based on the battery body heating power corresponding to the current operating condition and the cooling power of the thermal management; if it is determined that the first operating condition does not exist, the temperature rise corresponding to the current operating condition is determined based on the battery body heating power corresponding to the current operating condition.

[0108] Through the above method, it can be ensured that the determined temperature rise is more in line with the actual situation.

[0109] In some embodiments, determining the temperature rise corresponding to the working condition according to the total heating power corresponding to the working condition may include:

[0110] According to the allowable charging rate corresponding to the working condition, the time step corresponding to the working condition is determined, and the time step is used to indicate the theoretical charging time required for the battery to reach the charging cut-off SOC from the working condition;

[0111] The product of the total heating power corresponding to the working condition and the time step is determined as the calorific value corresponding to the working condition;

[0112] The ratio of the heat generation to the thermal capacity of the battery is determined as the temperature rise corresponding to the operating condition.

[0113] In some embodiments of the present application, the theoretical time required to fully charge the battery under a certain working condition is inversely related to the charging rate under the working condition, so for each working condition, the reciprocal of the allowable charging rate corresponding to the working condition can be converted into units and used as the time step corresponding to the working condition. The unit conversion refers to converting the unit of the reciprocal of the allowable charging rate into time, for example, into hours.

[0114] In some embodiments of the present application, the thermal capacity of a battery is the product of the total mass of the battery and the specific heat capacity of the battery. The specific heat capacity of a battery refers to the heat capacity of the battery per unit mass, that is, the amount of heat absorbed or released when a unit temperature is changed per unit mass. Both the total mass and the heat capacity ratio of the battery can be directly obtained from the existing parameters of the battery, so the thermal capacity of the battery can be calculated based on the battery parameters.

[0115] As an example, for each working condition, the corresponding first temperature rise can be calculated according to the following formula:

[0116]

[0117] Where, T i,j represents the temperature rise corresponding to the working condition (i, j), m represents the total mass of the battery, c represents the thermal capacity ratio of the battery, Indicates the heating power of the battery body corresponding to the working condition (i, j), Indicates the thermal management power corresponding to the working condition (i, j). Depending on the state of the working condition, its value can be the heating power, cooling power or 0 of the thermal management system. For example, when the total heating power corresponding to the working condition is the heating power of the battery body, The value of is 0. When the total heating power corresponding to the working condition is the sum of the heating power of the battery body and the cooling power, The value of is the cooling power of the thermal management system, for example 10kW.

[0118] Through the above method, the temperature rise of the battery under various working conditions can be determined.

[0119] For each operating condition in the fourth operating condition, after determining the temperature rise corresponding to the operating condition, it can be determined whether the operating condition is the first operating condition based on the temperature rise.

[0120] As an example, Figure 4 Taking the fourth working condition (i0, j0) in as an example, whether the working condition is the first working condition can be determined based on the following logic:

[0121] and i0≤14

[0122]

[0123] i0=i 0+1 ,j0=j 0+n

[0124] in, represents the cooling power of thermal management for the working condition (i0, j0), T i,j represents the temperature rise corresponding to the working condition (i0, j0), and 10 represents the cooling power. This is just an example. The cooling power may be different depending on the structure of the thermal management system used. Figure 3 As shown in Figure 2, if i0≤14 in (i0, j0), the set temperature in the working condition (i0, j0) will not exceed 45°C. In this case, if T i,j If the temperature is less than 5℃, the battery temperature after heating will not exceed the maximum temperature of 50℃. Therefore, there is no need to turn on cooling under this condition. If i0>14 in (i0,j0), and T i,jIf the temperature is greater than 5°C, the battery temperature will exceed the maximum temperature of 50°C. Therefore, cooling needs to be turned on under this condition.

[0125] See also Figure 5 , for Figure 2 The thermal management power corresponding to multiple operating conditions in the table is shown schematically, and the table includes the set SOC, set temperature and corresponding battery body heating power for each operating condition, wherein the parameter value in the first row is the set SOC, and the parameter value in the second column is the set temperature. The remaining parameter values ​​except the set SOC and the set temperature are the thermal management power, 7 represents heating power, -10 represents cooling power, and for the operating condition where the corresponding thermal management power is 7, it means that the battery under this operating condition needs to be heated by the thermal management system, and for the operating condition where the corresponding thermal management power is 0, it means that the battery under this operating condition does not need thermal management, that is, neither heating nor cooling is required, and for the operating condition where the corresponding thermal management power is -10, it means that the battery under this operating condition needs to be cooled by the thermal management system.

[0126] Through the above method, the first operating condition among multiple operating conditions can be accurately identified.

[0127] In some embodiments, after the cooling power start-up temperature threshold and the heating power start-up temperature threshold corresponding to each set SOC are determined through the embodiments of the present application, a thermal management strategy including the cooling power start-up temperature threshold and the heating power start-up temperature threshold corresponding to each set SOC can be generated. During the battery charging process, the thermal management system can be controlled to perform heating or cooling based on the thermal management strategy to achieve thermal management of the battery.

[0128] As an example, when the battery is thermally managed by a thermal management strategy including a cooling power start-up temperature threshold and a heating power start-up temperature threshold corresponding to each set SOC, such as Figure 6 As shown, the following steps may be included:

[0129] S61. During the battery charging process, determine the real-time operating condition of the battery, the real-time operating condition includes real-time SOC and real-time temperature;

[0130] S62. Determine a first cooling power start temperature threshold and a first heating power start temperature threshold corresponding to the real-time SOC from the thermal management strategy;

[0131] S63. Compare the real-time temperature with the first cooling power start temperature threshold and the first heating power start temperature threshold, respectively. If the real-time temperature is greater than the first cooling power start temperature threshold, execute S64; if the real-time temperature is less than the first heating power start temperature threshold, execute S65;

[0132] S64. Control the thermal management system to cool the battery;

[0133] S65. Control the thermal management system to heat the battery.

[0134] Through the above method, during the charging process, the operating condition of the battery is obtained in real time, and the thermal management method is adjusted in real time based on the temperature threshold corresponding to the real-time operating condition in the thermal management strategy, so as to meet the thermal management requirements of the fastest charging path, and limit the charging path of all single cells in the battery to the optimal charging range, so that the battery can reach the full charge state in the shortest time.

[0135] Based on the battery thermal management strategy determination method provided in the above embodiment, the present application also provides a specific implementation of a battery thermal management strategy determination device. Please refer to the following embodiment.

[0136] See also Figure 7 The battery thermal management strategy determination device provided in the embodiment of the present application includes the following modules:

[0137] A determination module 701 is used to determine multiple operating conditions of the battery and an allowable charging rate corresponding to each operating condition, each operating condition including a set state of charge SOC and a set temperature, the set temperature including the temperature of the battery and / or the temperature of the environment in which the battery is located;

[0138] A power determination module 702 is used to determine, for each operating condition, the heat generation power of the battery body when the battery is charged under the operating condition according to the allowable charging rate under the operating condition;

[0139] The temperature rise determination module 703 is used to determine the temperature rise corresponding to each of the multiple operating conditions in descending order of the proximity between the operating condition and the preset charging cut-off operating condition, wherein the charging cut-off operating condition includes the charging cut-off SOC and the maximum temperature, and the temperature rise corresponding to the operating condition is used to indicate the battery temperature change amount when the battery is charged from the operating condition to the charging cut-off SOC, and the temperature rise is determined based on the battery body heating power corresponding to the operating condition and the thermal management power required in the process of charging from the operating condition to the charging cut-off SOC;

[0140] A first operating condition determination module 704 is used to determine a first operating condition among multiple operating conditions, where the first operating condition refers to an operating condition in which the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature;

[0141] The cooling threshold determination module 705 is used to determine the cooling power start temperature threshold corresponding to each set SOC according to the set temperature included in the first operating condition.

[0142] The battery thermal management strategy determination device provided in this embodiment determines multiple working conditions of the battery and the allowable charging rate corresponding to each working condition. For each working condition, the heat generation power of the battery body when charging according to the allowable charging rate under the working condition is determined, = according to the order of proximity between the working condition and the preset charging cut-off working condition from large to small, the temperature rise corresponding to each working condition in the multiple working conditions is determined in sequence, and the first working condition in the multiple working conditions is determined. The first working condition refers to the working condition in which the sum of the set temperature and the corresponding temperature rise is greater than the maximum temperature. According to the set temperature included in the first working condition, the cooling power opening temperature threshold corresponding to each set SOC is determined. According to this embodiment, by analyzing the temperature change of the battery when charging under multiple working conditions, the cooling power opening temperature threshold corresponding to each set SOC is determined. Based on the cooling power opening temperature threshold corresponding to each set SOC, transient thermal management of the battery can be achieved. Compared with the traditional thermal management strategy based on the initial working condition, transient thermal management has higher precision and accuracy, and can effectively improve the battery charging rate.

[0143] In some embodiments, the cooling threshold determination module 705 is used to:

[0144] For each set SOC, determining a second operating condition in the first operating condition that includes the set SOC;

[0145] Determining a minimum set temperature value included in the second operating condition;

[0146] The set temperature minimum value is determined as the cooling power start temperature threshold corresponding to the set SOC.

[0147] In some embodiments, the apparatus further comprises:

[0148] A maximum rate determination module, used to determine the maximum charging rate corresponding to each operating condition before determining the temperature rise corresponding to each operating condition in the order of proximity between the operating condition and the charging cut-off operating condition from large to small;

[0149] A third operating condition determination module, used to determine a third operating condition among the multiple operating conditions, wherein the temperature included in the third operating condition is less than the maximum temperature, and the allowable charging rate corresponding to the third operating condition is less than the corresponding maximum charging rate;

[0150] A heating threshold determination module, used to determine a heating start temperature threshold corresponding to each set SOC according to the set temperature included in the third operating condition;

[0151] Accordingly, the temperature rise determination module 703 is used to:

[0152] The remaining working conditions after removing the third working condition from the plurality of working conditions are used as the fourth working condition;

[0153] The temperature rise corresponding to each operating condition in the fourth operating condition is determined in order from large to small according to the closeness of the operating condition to the charging cut-off operating condition.

[0154] In some embodiments, the heating threshold determination module is used to:

[0155] For each set SOC, determining a fifth operating condition in the third operating condition that includes the set SOC;

[0156] Determine the maximum set temperature included in the fifth operating condition;

[0157] The set temperature maximum value is determined as the heating power start temperature threshold corresponding to the set SOC.

[0158] In some embodiments, the temperature rise determination module 703 includes:

[0159] a judgment submodule, for determining, for each operating condition in the fourth operating condition, whether the operating conditions preceding the operating condition in the sequence include the first operating condition when determining the temperature rise corresponding to the operating condition;

[0160] A total heating power determination submodule is used to, when the operating condition preceding the operating condition does not include the first operating condition, use the heating power of the battery body corresponding to the operating condition as the total heating power corresponding to the operating condition; when the operating condition preceding the operating condition includes the first operating condition, use the sum of the heating power of the battery body corresponding to the operating condition and the preset cooling power as the total heating power corresponding to the operating condition;

[0161] The temperature rise determination submodule is used to determine the temperature rise corresponding to the working condition according to the total heating power.

[0162] In some embodiments, the temperature rise determination submodule is used to:

[0163] According to the allowable charging rate corresponding to the working condition, the time step corresponding to the working condition is determined, and the time step is used to indicate the theoretical charging time required for the battery to go from the working condition to the charging cut-off SOC;

[0164] The product of the total heating power corresponding to the working condition and the time step is determined as the calorific value corresponding to the working condition;

[0165] The ratio of the heat generation to the heat capacity of the battery is determined as the temperature rise corresponding to the operating condition.

[0166] The battery thermal management strategy determination device provided in the embodiment of the present application can achieve Figures 1 to 6 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0167] Figure 8 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application is shown.

[0168] The electronic device may include a processor 801 and a memory 802 storing computer program instructions.

[0169] Specifically, the processor 801 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0170] The memory 802 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 802 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 802 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 802 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 802 is a non-volatile solid-state memory. The memory 802 may include a read-only memory (ROM), a random access memory (RAM), a disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Therefore, typically, the memory 802 includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer executable instructions, and when the software is executed (e.g., by one or more processors), it may perform the operations described in any of the battery thermal management strategy determination methods in the above-mentioned embodiments.

[0171] The processor 801 implements any one of the battery thermal management strategy determination methods in the above embodiments by reading and executing computer program instructions stored in the memory 802 .

[0172] In one example, the electronic device may further include a communication interface 803 and a bus 810. Figure 8 As shown, the processor 801, the memory 802, and the communication interface 803 are connected via a bus 810 and communicate with each other.

[0173] The communication interface 803 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0174] Bus 810 includes hardware, software or both, and the parts of online data flow billing equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 810 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the application considers any suitable bus or interconnection.

[0175] In addition, in combination with the battery thermal management strategy determination method in the above embodiment, the present application embodiment can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the battery thermal management strategy determination methods in the above embodiment is implemented.

[0176] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0177] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0178] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0179] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0180] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A method for determining a battery thermal management strategy, characterized in that: include: Determine multiple operating conditions of the battery and an allowable charging rate corresponding to each operating condition, each operating condition includes a set state of charge SOC and a set temperature, different operating conditions include different set states of charge SOC and / or set temperatures, the set temperature includes the temperature of the battery and / or the temperature of the environment in which the battery is located; For each operating condition, according to the allowable charging rate under the operating condition, determine the heat generation power of the battery body when the battery is charged under the operating condition; Determining the temperature rise corresponding to each of the multiple operating conditions in descending order of proximity between the operating condition and the preset charge cut-off operating condition, wherein the charge cut-off operating condition includes a charge cut-off SOC and a maximum temperature, and the temperature rise corresponding to the operating condition is used to indicate a battery temperature change amount when the battery is charged from the operating condition to the charge cut-off SOC, and the temperature rise corresponding to the operating condition is determined based on the heat generation power of the battery body corresponding to the operating condition and the thermal management power required in the process of charging from the operating condition to the charge cut-off SOC; Determine a first operating condition among the multiple operating conditions, the first operating condition being an operating condition in which a sum of a set temperature and a corresponding temperature rise is greater than the maximum temperature; According to the set temperature included in the first operating condition, a cooling power start temperature threshold corresponding to each set SOC in the multiple operating conditions is determined respectively.

2. The method according to claim 1, characterized in that The step of determining the cooling power start-up temperature threshold corresponding to each set SOC in the plurality of operating conditions according to the set temperature included in the first operating condition includes: For each set SOC, determining a second operating condition including the set SOC in the first operating condition; Determining a minimum set temperature value included in the second operating condition; The set temperature minimum value is determined as the cooling power start-up temperature threshold corresponding to the set SOC.

3. The method according to claim 1 or 2, characterized in that: Before determining the temperature rise corresponding to each of the multiple operating conditions in descending order of proximity between the operating condition and the preset charging cut-off operating condition, the method further includes: Determine the maximum charging rate corresponding to each working condition respectively; Determining a third operating condition among the multiple operating conditions, wherein the temperature included in the third operating condition is less than the maximum temperature, and the allowable charging rate corresponding to the third operating condition is less than the corresponding maximum charging rate; According to the set temperature included in the third operating condition, respectively determine the heating start temperature threshold corresponding to each set SOC; The determining, in descending order of the proximity between the operating condition and the charging cut-off operating condition, the temperature rise corresponding to each operating condition in the multiple operating conditions comprises: The remaining operating conditions after removing the third operating condition from the plurality of operating conditions are used as the fourth operating condition; The temperature rise corresponding to each operating condition in the fourth operating condition is determined in sequence according to the order of proximity between the operating condition and the charging cut-off operating condition from large to small.

4. The method according to claim 3, characterized in that The step of determining the heating power on temperature threshold corresponding to each set SOC according to the set temperature included in the third operating condition includes: For each set SOC, determining a fifth operating condition in the third operating condition that includes the set SOC; Determining a maximum set temperature value included in the fifth operating condition; The set temperature maximum value is determined as the heating power start-up temperature threshold corresponding to the set SOC.

5. The method according to claim 3, characterized in that: The determining the temperature rise corresponding to each operating condition in the fourth operating condition in descending order of proximity between the operating condition and the preset charging cut-off operating condition comprises: For each operating condition in the fourth operating condition, when determining the temperature rise corresponding to the operating condition, determining whether the operating condition preceding the operating condition in the sequence includes the first operating condition; When the operating condition preceding the operating condition does not include the first operating condition, the heating power of the battery body corresponding to the operating condition is taken as the total heating power corresponding to the operating condition; In the case where the operating condition preceding the operating condition includes the first operating condition, the sum of the heating power of the battery body corresponding to the operating condition and the preset cooling power is used as the total heating power corresponding to the operating condition; The temperature rise corresponding to the working condition is determined according to the total heating power.

6. The method according to claim 5, characterized in that Determining the temperature rise corresponding to the working condition according to the total heating power includes: Determine a time step corresponding to the operating condition according to the allowable charging rate corresponding to the operating condition, wherein the time step is used to indicate a theoretical charging time required for the battery to charge from the operating condition to the charging cut-off SOC; The product of the total heating power corresponding to the working condition and the time step is determined as the heating value corresponding to the working condition; The ratio of the heat generation to the heat capacity of the battery is determined as the temperature rise corresponding to the operating condition.

7. A battery thermal management strategy determination device, characterized in that: include: A determination module, used to determine multiple operating conditions of the battery and an allowable charging rate corresponding to each operating condition, each operating condition includes a set state of charge SOC and a set temperature, different operating conditions include different set states of charge SOC and / or set temperatures, the set temperature includes the temperature of the battery and / or the temperature of the environment in which the battery is located; A power determination module, for determining, for each operating condition, the heat generation power of the battery body when the battery is charged under the operating condition according to the allowable charging rate under the operating condition; a temperature rise determination module, used to determine the temperature rise corresponding to each of the multiple operating conditions in descending order of proximity between the operating condition and a preset charge cut-off operating condition, wherein the charge cut-off operating condition includes a charge cut-off SOC and a maximum temperature, the temperature rise corresponding to the operating condition is used to indicate the battery temperature change amount of the battery when charging from the operating condition to the charge cut-off SOC, and the temperature rise is determined based on the battery body heating power corresponding to the operating condition and the thermal management power required in the process of charging from the operating condition to the charge cut-off SOC; A first operating condition determination module, configured to determine a first operating condition among the multiple operating conditions, wherein the first operating condition refers to an operating condition in which a sum of a set temperature and a corresponding temperature rise is greater than the maximum temperature; The cooling threshold determination module is used to determine the cooling power start temperature threshold corresponding to each set SOC in the multiple operating conditions according to the set temperature included in the first operating condition.

8. An electronic device, characterized in that: The electronic device comprises: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, the steps of the battery thermal management strategy determination method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the steps of the method for determining a battery thermal management strategy according to any one of claims 1 to 6 are implemented.

10. A vehicle, characterized in that: It comprises the battery thermal management strategy determination device as claimed in claim 7.

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