Method and device for determining discharge power of battery

Abstract

The invention relates to the technical field of battery management, and discloses a method and device for determining the discharge power of a battery, and the method comprises the steps: obtaining the associated data, used for determining the discharge power of the battery, of the battery and the current temperature of a first battery cell in a battery cell set of the battery; wherein the distance between the first battery cell and a boundary beam of the battery is smaller than a distance threshold value, and the associated data comprises the environment temperature of the environment where the battery is located and the running speed of a vehicle matched with the battery; and determining the discharge power of the battery based on the associated data and the current temperature.

Description

Technical Field

[0001] The present application relates to the technical field of battery management, and particularly to a method and device for determining the discharge power of a battery. Background Art

[0002] The power performance and endurance of electric vehicles in winter are reduced compared to normal temperature, especially in cold regions. This is also one of the reasons why electric vehicles cannot be popularized in the north. The reduction in power performance not only brings bad driving experiences but also problems such as undervoltage and breakdown due to improper use of the battery's discharge power.

[0003] The discharge power of a battery is determined by the state of charge (SOC) of the battery cell and the temperature of the battery cell. In related technologies, a negative temperature coefficient thermistor (NTC) is arranged at the top cover of the battery cell to detect the temperature of the battery cell, and then the discharge power of the battery is determined according to the calculated state of charge of the battery cell.

[0004] However, arranging the NTC at the top cover of the battery cell cannot accurately detect the true temperature of the battery cell, thus unable to accurately determine the discharge power of the battery, which in turn leads to problems such as undervoltage and breakdown due to improper use of the battery's discharge power.

[0005] Therefore, how to accurately determine the discharge power of a battery has become a technical problem to be solved. Summary of the Invention

[0006] In view of this, the present application provides a method and device for determining the discharge power of a battery.

[0007] In a first aspect, the present application provides a method for determining the discharge power of a battery. The method includes: obtaining the associated data for determining the discharge power of the battery and the current temperature of a first battery cell in the battery cell set of the battery; wherein, the distance between the first battery cell and the side beam of the battery is less than a distance threshold, and the associated data includes: the ambient temperature of the environment where the battery is located and the driving speed of the vehicle equipped with the battery; determining the discharge power of the battery based on the associated data and the current temperature.

[0008] In a possible implementation manner, determining the discharge power of the battery based on the associated data and the current temperature includes: determining a target temperature difference of the first battery cell based on the associated data and the current temperature; determining the target temperature of the battery according to the target temperature difference and the current temperature; determining the preset discharge power of the battery corresponding to the target temperature as the discharge power of the battery according to the corresponding relationship between the target temperature of the battery and the preset discharge power of the battery and the target temperature.

[0009] In a possible implementation, the associated data further includes: the side beam temperature of the battery, the current of the battery, and the voltage of each battery cell; and determining the target temperature difference of the first battery cell based on the associated data and the current temperature includes: determining the heat generated by the battery cells of the battery, the heat generated by mechanical components, and the external thermal management heat according to the current temperature, the side beam temperature, the current of the battery, the voltage of each battery cell, and a preset battery cell heat generation power table; determining the heat dissipation corresponding to the battery according to the ambient temperature and the driving speed of the vehicle; and determining the target temperature difference of the first battery cell based on the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation.

[0010] In a possible implementation, determining the target temperature difference of the first battery cell based on the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation includes: determining the first target heat of the first battery cell according to the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation; respectively determining the temperature difference corresponding to each part of the first battery cell according to the mass of each part of the first battery cell, the first target heat of the first battery cell, and the specific heat capacity of the first battery cell, and determining the first maximum temperature difference and the first minimum temperature difference from the temperature differences corresponding to each part of the first battery cell; wherein, the first battery cell is composed of multiple parts; and using the first maximum temperature difference and the first minimum temperature difference as the target temperature difference respectively.

[0011] In a possible implementation, the number of the first battery cells in the battery cell set is multiple; and determining the target temperature difference of the first battery cell based on the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation includes: respectively determining the second target heat of each first battery cell according to the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation of each first battery cell; respectively determining the temperature difference to be screened of each first battery cell based on the second target heat of each first battery cell; wherein, the second battery cell is any one of the multiple first battery cells, and determining the temperature difference to be screened of the second battery cell specifically includes: respectively determining the temperature difference of each part of the second battery cell according to the mass of each part of the second battery cell, the second target heat corresponding to the second battery cell, and the specific heat capacity of the second battery cell, and determining the second maximum temperature difference and the second minimum temperature difference of the second battery cell from the temperature differences of each part of the second battery cell; using the second maximum temperature difference and the second minimum temperature difference as the temperature difference to be screened of the second battery cell respectively; determining the third maximum temperature difference and the third minimum temperature difference from the temperature differences to be screened, and using the third maximum temperature difference and the third minimum temperature difference as the target temperature difference of the battery cells respectively.

[0012] In a possible implementation, the associated data further includes: the voltage of each single battery cell corresponding to the vehicle operating condition; determining the discharge power of the battery based on the associated data and the current temperature, including: according to the correspondence between the first preset combination for determining the discharge power of the battery and the preset protection voltage, and the first current combination for determining the discharge power of the battery, determining the preset protection voltage corresponding to the first current combination as the target protection voltage; wherein, the first current combination includes: the ambient temperature, the driving speed of the vehicle, the voltage of each single battery cell, and the current temperature; the first preset combination includes: the preset ambient temperature, the preset driving speed, the first preset voltage of each single battery cell, and the preset temperature; according to the correspondence between the second preset combination for determining the discharge power of the battery and the preset discharge power of the battery, and the second current combination for determining the discharge power of the battery, determining the preset discharge power of the battery corresponding to the second current combination as the discharge power of the battery; wherein, the second preset combination includes: the second preset voltage of each single battery cell and the preset target protection voltage; the second current combination includes: the voltage of each single battery cell and the target protection voltage.

[0013] In a second aspect, the present application provides an apparatus for determining the discharge power of a battery. The apparatus includes: an acquisition module, configured to acquire the associated data for determining the discharge power of the battery and the current temperature of the first battery cell in the battery cell set of the battery; wherein, the distance between the first battery cell and the side beam of the battery is less than a distance threshold, and the associated data includes: the ambient temperature of the environment where the battery is located and the driving speed of the vehicle equipped with the battery; a determination module, configured to determine the discharge power of the battery based on the associated data and the current temperature.

[0014] In a third aspect, the present application provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the method for determining the discharge power of the battery according to the first aspect or any corresponding implementation manner thereof.

[0015] In a fourth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored. The computer instructions are used to cause a computer to execute the method for determining the discharge power of the battery according to the first aspect or any corresponding implementation manner thereof.

[0016] In a fifth aspect, the present application provides a computer program product, including computer instructions, which are used to cause a computer to execute the method for determining the discharge power of the battery according to the first aspect or any corresponding implementation manner thereof.

[0017] The method for determining the discharge power of a battery provided by the embodiments of the present disclosure collects the temperature of the first battery cells in the battery cell set whose distance from the side beam of the battery is less than the distance threshold. Since the side beam of the battery is affected by the external environment, by collecting the temperature of the battery cells at the side beam of the battery, the temperature of the battery cells in the battery that are more affected by the external environment can be determined, so as to accurately determine the true temperature of the battery after being affected by the external environment. And because the temperature of the battery cells sampled by the NTC is different from the true temperature of the battery cells, the temperature of the battery cells sampled by the NTC is higher than the true temperature of the battery cells. The discharge power of the battery determined according to the higher temperature is greater than the discharge power of the battery determined according to the true temperature, resulting in the battery discharging beyond its actual discharge capacity, and then causing the voltage of the battery cells to drop rapidly, resulting in problems such as under-voltage and stalling of the battery. The embodiments of the present disclosure determine the true temperature of the battery after being affected by the external environment, so that the battery cells discharge according to the actual discharge capacity, avoiding problems such as under-voltage and stalling of the battery.

[0018] Moreover, due to the different ambient temperatures and vehicle speeds, the discharge power of the battery will also change. Based on the temperature of the first battery cells, the ambient temperature of the environment where the battery is located, and the current temperature, the discharge power of the battery affected by the ambient temperature and vehicle speed can be accurately determined. Since the difference between the temperature of the battery cells sampled by the NTC and the true temperature of the battery cells is also different under different ambient temperatures and different vehicle conditions. The lower the ambient temperature and the faster the vehicle speed, the greater the heat dissipation of the battery cells at the side beam of the battery to the outside, and the greater the difference between the temperature of the battery cells sampled by the NTC and the true temperature of the battery cells. Therefore, by considering the influence of the ambient temperature and vehicle speed, the discharge power of the battery can be more accurately determined, enabling the battery cells to exert the maximum discharge capacity, which is beneficial to the improvement of the discharge power of the battery in cold temperatures. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a flowchart of the method for determining the discharge power of a battery according to the embodiments of the present application;

[0021] Figure 2 is a schematic diagram of the temperature distribution of the battery cells of the battery provided by the embodiments of the present application;

[0022] Figure 3It is a schematic diagram of a method for determining the discharge power of a battery according to an embodiment of the present application.

[0023] Figure 4 It is a schematic diagram of the discreteness of battery cells according to an embodiment of the present application;

[0024] Figure 5 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present application. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0026] According to an embodiment of the present application, there is provided an embodiment of a method for determining the discharge power of a battery. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0027] In this embodiment, there is provided a method for determining the discharge power of a battery, which can be used in a vehicle controller, such as a vehicle controller, etc. Figure 1 It is a flowchart of a method for determining the discharge power of a battery according to an embodiment of the present application, as Figure 1 shown, the process includes the following steps:

[0028] Step S101, obtain the associated data for determining the discharge power of the battery and the current temperature of the first battery cell in the battery cell set of the battery; wherein, the distance between the first battery cell and the side beam of the battery is less than the distance threshold, and the associated data includes: the ambient temperature of the environment where the battery is located and the driving speed of the vehicle equipped with the battery.

[0029] The associated data can be the data for determining the discharge power of the battery. Among them, the associated data can include the ambient temperature of the environment where the battery is located and the driving speed of the vehicle equipped with the battery.

[0030] As an example, the associated data can also include: the side beam temperature of the battery, the current of the battery, and the single cell voltage of the battery cell.

[0031] During the driving process of the vehicle, since the battery is installed in the vehicle, when the environment where the vehicle is located changes, the ambient temperature of the environment where the battery is located will also change. That is, the ambient temperature of the environment where the battery is located can be the ambient temperature obtained in real time. Correspondingly, the driving speed of the vehicle can also be the driving speed obtained in real time.

[0032] The battery cell is the core energy storage unit of the battery, and the battery cell is responsible for the direct storage and release of electrical energy. Among them, the battery can include multiple battery cells. In this embodiment, the first battery cell is the battery cell among the multiple battery cells whose distance from the side beam of the battery is less than the distance threshold. The distance threshold can be a preset threshold. The battery cell set can be composed of multiple first battery cells or one first battery cell, and no specific limitation is made here. The current temperature of the first battery cell can be obtained by the NTC at the NTC temperature collection point set near the side beam.

[0033] In a possible implementation, the battery cell can be the battery cell on the windward side of the battery near the side beam. Among them, the windward side can indicate the side of the battery facing the head of the vehicle.

[0034] Please refer to Figure 2 , Figure 2 which is a schematic diagram of the temperature distribution of the battery cells according to the embodiment of the present application.

[0035] Combined with Figure 2 As shown, since in a low-temperature environment, the battery cells near the side beam of the battery are in direct or indirect contact with the side beam, and heat exchange is carried out with the external environment through the battery pack box. Especially when the ambient temperature is below the temperature T (such as -20 °C) and the battery is discharging and generating heat continuously, the temperature difference between the battery cells near the side beam (such as the battery cells in the cold zone) and the battery cells inside the battery (such as the battery cells in the hot zone) is relatively large. Therefore, by collecting the temperature of the first battery cell, the true temperature of the battery cell can be determined more accurately.

[0036] Step S102, determine the discharge power of the battery based on the associated data and the current temperature.

[0037] After determining the above-mentioned associated data, the discharge power of the battery can be determined based on the ambient temperature of the environment where the battery is located, the driving speed of the vehicle equipped with the battery, and the current temperature of the first battery cell.

[0038] As an example, a neural network model can be used to determine the discharge power of the battery. Among them, the associated data and the current temperature can be used as the input of the neural network model, and the discharge power of the battery can be used as the output of the neural network model. The neural network model includes but is not limited to: Convolutional Neural Network (CNN) and Long Short-Term Memory (LSTM), etc.

[0039] As an example, the discharge power of the battery can be determined by using a thermal model nested in a Battery Management System (BMS). Among them, the associated data and the current temperature can be used as input signals of the thermal model, and the discharge power of the battery can be used as an output signal of the thermal model.

[0040] In the method for determining the discharge power of the battery provided by the embodiments of the present disclosure, by collecting the temperature of the first battery cell in the battery cell set of the battery whose distance from the side beam of the battery is less than the distance threshold, since the side beam of the battery is affected by the external environment, by collecting the temperature of the battery cell at the side beam of the battery, the temperature of the battery cell in the battery that is greatly affected by the external environment can be determined, so as to accurately determine the true temperature of the battery after being affected by the external environment. And because the temperature of the battery cell sampled by NTC is different from the true temperature of the battery cell, the temperature of the battery cell sampled by NTC is higher than the true temperature of the battery cell. The discharge power of the battery determined according to the higher temperature is greater than the discharge power of the battery determined according to the true temperature, resulting in the battery discharging beyond its actual discharge capacity, and then causing the voltage of the battery cell to drop rapidly, resulting in problems such as under-voltage and stalling of the battery. The embodiments of the present disclosure make the battery cell discharge according to the actual discharge capacity by determining the true temperature of the battery after being affected by the external environment, avoiding problems such as under-voltage and stalling of the battery.

[0041] Moreover, due to the different ambient temperatures and vehicle driving speeds, the discharge power of the battery will also change. Based on the temperature of the first battery cell, the ambient temperature of the environment where the battery is located, and the current temperature, the discharge power of the battery after being affected by the ambient temperature and vehicle driving speed can be accurately determined. Since the difference between the temperature of the battery cell sampled by NTC and the true temperature of the battery cell is also different under different ambient temperatures and different vehicle conditions. The lower the ambient temperature and the faster the vehicle driving speed, the greater the heat dissipation of the battery cell at the side beam of the battery to the outside, and the greater the difference between the temperature of the battery cell sampled by NTC and the true temperature of the battery cell. Therefore, by considering the influence of the ambient temperature and vehicle driving speed, the discharge power of the battery can be more accurately determined, enabling the battery cell to exert the maximum discharge capacity, which is beneficial to the improvement of the discharge power of the battery in cold temperatures.

[0042] In another possible implementation manner, the above step S102 includes: steps S1021 - S1023.

[0043] In step S1021, based on the associated data and the current temperature, determine the target temperature difference of the first battery cell.

[0044] The target temperature difference can indicate the temperature difference between the current temperature of the battery cell sampled by NTC and the true temperature of the battery. Among them, the target temperature difference can include the maximum temperature difference and the minimum temperature difference.

[0045] In the embodiments of the present application, the maximum temperature difference and the minimum temperature difference of the first battery cell can be determined based on the associated data and the current temperature.

[0046] As an example, the maximum temperature difference and the minimum temperature difference of the first battery cell can be determined according to a preset formula, associated data, and the current temperature.

[0047] In step S1022, the target temperature of the battery is determined according to the target temperature difference and the current temperature.

[0048] In the embodiments of the present application, since in a low-temperature environment, the battery cells near the side beam are in direct or indirect contact with the side beam, and heat exchange is carried out with the external environment through the battery pack housing. Especially when the ambient temperature is below temperature T (such as -20 °C) and the battery is generating heat continuously during the discharge process, the temperature difference between the sampled temperature of the battery cell and the actual temperature of the battery cell gradually increases, thereby increasing the heat loss of the battery. Therefore, the target temperature of the battery, that is, the actual temperature of the battery, can be determined through the current temperature of the battery cell near the side beam and the target temperature difference of the first battery cell.

[0049] In specific implementation, after determining the target temperature difference and the current temperature, the target temperature difference can be further determined according to the target temperature difference and the current temperature.

[0050] As an example, the target temperature difference can be determined according to the difference between the target temperature difference and the current temperature, etc. No specific limitation is made here, and it can be implemented by those skilled in the art.

[0051] In step S1023, according to the correspondence between the target temperature of the battery and the preset discharge power of the battery, and the target temperature, the preset discharge power of the battery corresponding to the target temperature is determined as the discharge power of the battery.

[0052] The correspondence between the target temperature of the battery and the preset discharge power of the battery can indicate the preset discharge power of the battery corresponding to each target temperature. Among them, the preset discharge power of the battery corresponding to each target temperature can be pre-calibrated. For example: the preset discharge power corresponding to the target temperature M1 can be N1, and the preset discharge power corresponding to the target temperature M2 can be N2.

[0053] After determining the target temperature of the battery, the preset discharge power of the battery can be matched according to the target temperature, and the preset discharge power of the battery corresponding to the target temperature is determined as the discharge power of the battery.

[0054] As an example, a power MAP table (Power MAP Table, MAP) can be preset, where the power MAP table stores the correspondence between the target temperature of the battery and the preset discharge power of the battery.

[0055] The method for determining the discharge power of the battery provided by the embodiments of the present disclosure can determine the true temperature of the battery by calculating the target temperature difference and determining the target temperature according to the target temperature difference, and can accurately determine the discharge power of the battery according to the correspondence between the true temperature of the battery and the discharge power of the battery, so as to avoid problems such as under-voltage and stalling of the battery.

[0056] In another possible implementation, the associated data further includes: the side beam temperature of the battery, the current of the battery, and the voltage of the single cell; and the above step S1021 may include: step S1021A, step S1021B, and step S1021C.

[0057] In step S1021A, according to the current temperature, the side beam temperature, the current of the battery, the voltage of the single cell, and the preset cell heat generation power table, determine the heat generated by the battery cells, the heat generated by mechanical parts, and the external thermal management heat.

[0058] The side beam temperature may be the temperature of the side beam of the battery. The preset cell heat generation power table may indicate the correspondence between the current temperature, the side beam temperature, the current of the battery, the voltage of the single cell, and the heat generated by the battery cells, the heat generated by mechanical parts, and the external thermal management heat. That is, through the current temperature, the side beam temperature, the current of the battery, and the voltage of the single cell, the heat generated by the battery cells, the heat generated by mechanical parts, and the external thermal management heat can be determined from the preset cell heat generation power table.

[0059] As an example, the heat generated by the battery cells can be determined according to the current temperature, the side beam temperature, and the current of the battery; the heat generated by mechanical parts can be determined according to the side beam temperature, the current of the battery, and the voltage of the single cell, etc., which are not specifically limited herein and can be implemented by those skilled in the art.

[0060] The heat generation of the battery cells may include heat generation during cell discharge and may also include heat generation during cell charging. The heat generation method of the battery cells in the embodiments of the present application can be determined according to the actual working conditions of the battery cells, which are not specifically limited herein.

[0061] In step S1021B, determine the heat dissipation corresponding to the battery according to the ambient temperature and the driving speed of the vehicle.

[0062] The heat dissipation corresponding to the battery can be determined by the ambient temperature and the driving speed of the vehicle. Among them, the lower the ambient temperature and the higher the driving speed of the vehicle, the greater the heat dissipation corresponding to the battery.

[0063] As an example, the heat dissipation amount corresponding to the battery can be determined according to a pre-set formula for determining the heat dissipation amount corresponding to the battery.

[0064] As an example, the heat dissipation amount corresponding to the battery can be determined by a neural network model. Among them, the ambient temperature and the driving speed of the vehicle can be used as the inputs of the neural network model, and the heat dissipation amount corresponding to the battery can be used as the output of the neural network model.

[0065] In step S1022C, based on the heat generated by the battery cell, the heat generated by mechanical components, the external heat management heat, and the heat dissipation amount, determine the target temperature difference of the first battery cell.

[0066] According to the heat generated by the battery cell, the heat generated by mechanical components, the external heat management heat, and the heat dissipation amount, the heat for temperature rise or the heat for temperature drop of the battery cell can be further determined. Among them, when the value obtained according to the heat generated by the battery cell, the heat generated by mechanical components, the external heat management heat, and the heat dissipation amount is negative, the heat for temperature drop of the battery cell can be further determined; when the value obtained according to the heat generated by the battery cell, the heat generated by mechanical components, the external heat management heat, and the heat dissipation amount is positive, the heat for temperature rise of the battery cell can be further determined. After determining the heat for temperature rise or the heat for temperature drop of the battery cell, the heat for temperature rise or the heat for temperature drop of the battery cell can be used as the target temperature difference of the first battery cell.

[0067] Please refer to Figure 3 , Figure 3 is a schematic diagram of a method for determining the discharge power of a battery according to an embodiment of the present application.

[0068] Combined with Figure 3 shown, the target temperature difference of the first battery cell can be determined by using a thermal model nested in a Battery Management System (BMS). Among them, the current temperature of the battery cell, the side beam temperature, the current of the battery, the voltage of the battery cell monomer, the ambient temperature, and the driving speed of the vehicle can be used as the input signals of the thermal model, and the target temperature difference can be used as the output signal of the thermal model.

[0069] In a possible implementation manner, the target temperature difference of the first battery cell can be determined by the following formula.

[0070] The heat for temperature rise of the battery cell = C * M 电芯 * ΔT. Where C is the specific heat capacity of the battery cell, M 电芯 is the mass of the battery cell, and ΔT is the target temperature difference of the first battery cell.

[0071] The heat for temperature drop of the battery cell = C * M 电芯 * ΔT. Where C is the specific heat capacity of the battery cell, M 电芯where m is the mass of the battery cell and ΔT is the target temperature difference of the first battery cell.

[0072] In a possible implementation, the target temperature difference of the first battery cell can be determined using a physical model of software such as AMEsim or Simulink.

[0073] The method for determining the discharge power of the battery provided by the embodiments of the present disclosure can accurately determine the temperature difference of the battery cell and then accurately determine the true temperature of the battery by considering the external influence of the ambient temperature and the vehicle speed on the temperature of the battery, and the internal influence of the current temperature of the battery cell, the side beam temperature, the current of the battery, and the voltage of the battery cell on the temperature of the battery.

[0074] In another possible implementation, step S1022C may include: step S1022C1, step S1022C2, and step S1022C3.

[0075] Step S1022C1: Determine the first target heat of the first battery cell according to the heat generated by the battery cell, the heat generated by the mechanical parts, the external thermal management heat, and the heat dissipation.

[0076] The first target heat of the first battery cell can be the heat for temperature rise of the battery cell or the heat for temperature drop of the battery cell.

[0077] As an example, the first target heat of the first battery cell can be determined by the following formula.

[0078] Heat for temperature rise of the battery cell = Heat generated by the battery cell + Heat generated by the mechanical parts + External thermal management heat - Heat dissipation.

[0079] Heat for temperature drop of the battery cell = Heat generated by the battery cell + Heat generated by the mechanical parts + External thermal management heat - Heat dissipation.

[0080] Among them, when the first target heat is negative, the first target heat can be the heat for temperature drop of the battery cell; when the first target heat is positive, the first target heat can be the heat for temperature rise of the battery cell.

[0081] Step S1022C2: According to the mass of each part of the first battery cell, the first target heat of the first battery cell, and the specific heat capacity of the first battery cell, respectively determine the temperature difference corresponding to each part of the first battery cell, and determine the first maximum temperature difference and the first minimum temperature difference from the temperature differences corresponding to each part of the first battery cell.

[0082] Please refer to Figure 4 , Figure 4 which is a schematic diagram of the discretization of the battery cell provided by the embodiments of the present application.

[0083] The discretization of the battery cell can indicate that the first battery cell is divided into multiple parts (such as Figure 4 each square formed by the dashed part in

[0084] ). Each part of the first battery cell can be a preset part. For example, the first battery cell is divided into 10 parts. Another example: the first battery cell is divided into 16 parts, etc. Among them, the areas of the multiple parts into which the first battery cell is divided can be the same, or the areas of the multiple parts into which the first battery cell is divided can be different. Specifically, the areas of the multiple parts into which the first battery cell is divided can be set according to requirements, and no specific limitation is made here.

[0085] After the first battery cell is divided into multiple parts, for each part of the first battery cell, the temperature difference corresponding to each part of the first battery cell needs to be determined respectively according to the mass of each part in the multiple parts of the first battery cell, the first target heat of the first battery cell, and the specific heat capacity of the first battery cell.

[0086] The heat for temperature rise of the battery cell = C * M 部分 * ΔT. Wherein, C is the specific heat capacity of the battery cell, M 部分 is the mass of the part into which the battery cell is divided, and ΔT is the target temperature difference of the first battery cell.

[0087] The heat for temperature drop of the battery cell = C * M 部分 * ΔT. Wherein, C is the specific heat capacity of the battery cell, M 部分 is the mass of the part into which the battery cell is divided, and ΔT is the target temperature difference of the first battery cell.

[0088] After determining the temperature difference corresponding to each part of the battery cell, the temperature differences corresponding to each part of the battery cell can be compared to determine the first maximum temperature difference and the first minimum temperature difference among the temperature differences corresponding to each part of the battery cell.

[0089] Step S1022C3, taking the first maximum temperature difference and the first minimum temperature difference as the target temperature differences respectively.

[0090] Then take the first maximum temperature difference and the first minimum temperature difference as the target temperature differences respectively.

[0091] The method for determining the discharge power of the battery provided by the embodiments of the present disclosure can accurately determine the target temperature difference of the battery cell by dividing the battery cell into multiple parts, determining the temperature difference of each part of the battery cell respectively, then comparing the temperature differences of each part, and taking the first maximum temperature difference and the first minimum temperature difference as the target temperature differences respectively, so as to accurately determine the true temperature of the battery.

[0092] In another possible implementation, the number of the first battery cells in the battery cell set is multiple; step S1022C may include: step S1022C4, step S1022C5, and step S1022C6.

[0093] In step S1022C4, according to the heat generated by each first battery cell, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation, respectively determine the second target heat of each first battery cell.

[0094] When the number of the first battery cells is multiple, the true temperature of the battery can be determined by determining the target temperature difference of each battery cell.

[0095] Specifically, in implementation, according to the heat generated by each first battery cell, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation, respectively determine the second target heat of each first battery cell.

[0096] In step S1022C5, based on the second target heat of each first battery cell, respectively determine the temperature difference of each first battery cell; wherein, the second battery cell is any one of the multiple first battery cells, and determining the temperature difference to be screened of the second battery cell specifically includes: according to the mass of each part of the second battery cell, the second target heat corresponding to the second battery cell, and the specific heat capacity of the second battery cell, respectively determine the temperature difference of each part of the second battery cell, and determine the second maximum temperature difference and the second minimum temperature difference of the second battery cell from the temperature differences of each part of the second battery cell; take the second maximum temperature difference and the second minimum temperature difference as the temperature differences to be screened of the second battery cell respectively.

[0097] The second battery cell can be any one of the multiple first battery cells, that is, for the second battery cell, according to the mass of each part of the second battery cell, the second target heat corresponding to the second battery cell, and the specific heat capacity of the second battery cell, respectively determine the temperature difference to be screened of each part of the second battery cell, then determine the second maximum temperature difference and the second minimum temperature difference from the temperature differences of each part of the second battery cell, and take the second maximum temperature difference and the second minimum temperature difference as the temperature differences to be screened respectively.

[0098] Further, since the second battery cell can be any one of the multiple first battery cells, the temperature differences of all second battery cells can be determined according to the above method.

[0099] In step S1022C6, determine the third maximum temperature difference and the third minimum temperature difference from the temperature differences to be screened, and take the third maximum temperature difference and the third minimum temperature difference as the target temperature differences of the battery cells respectively.

[0100] After determining the temperature differences to be screened for all the second battery cells, the third maximum temperature difference and the third minimum temperature difference of the first battery cell can be determined from the temperature differences to be screened for all the second battery cells, that is, the temperature difference with the largest value among the temperature differences to be screened is determined as the third maximum temperature difference, and the temperature difference with the smallest value is determined as the third minimum temperature difference, and the third maximum temperature difference and the third minimum temperature difference are respectively used as the target temperature differences of the battery cells.

[0101] In the method for determining the discharge power of a battery provided by the embodiments of the present disclosure, when the number of the first battery cells is multiple, by calculating the temperature differences for the divided parts of each first battery cell respectively, the temperature difference of each first battery cell is determined, and then the target temperature difference is determined from the temperature differences of each first battery cell, so that the target temperature difference of the first battery cell can be determined more accurately, and further the true temperature of the battery can be determined accurately.

[0102] In another possible implementation manner, the associated data further includes: the single-cell voltage of the battery corresponding to the vehicle operating condition; and the above step S102 includes: step S1024 - step S1025.

[0103] In step S1024, according to the correspondence between the first preset combination for determining the discharge power of the battery and the preset protection voltage, and the first current combination for determining the discharge power of the battery, the preset protection voltage corresponding to the first current combination is determined as the target protection voltage; wherein, the first current combination includes: the ambient temperature, the driving speed of the vehicle, the single-cell voltage of the battery, and the current temperature; the first preset combination includes: the preset ambient temperature, the preset driving speed, the first preset single-cell voltage of the battery, and the preset temperature.

[0104] The correspondence between the first preset combination for determining the discharge power of the battery and the preset protection voltage can be a pre-calibrated relationship. For example: the first preset combination K1 for determining the discharge power of the battery corresponds to the first preset protection voltage L2, and the first preset combination K2 for determining the discharge power of the battery corresponds to the first preset protection voltage L3.

[0105] The first current combination for determining the discharge power of the battery can indicate the influencing factors for determining the discharge power of the battery. Among them, the first current combination can include: the ambient temperature, the driving speed of the vehicle, the single-cell voltage of the battery, and the current temperature, that is, the ambient temperature, the driving speed of the vehicle, the single-cell voltage of the battery, and the current temperature can be used as the influencing factors for determining the discharge power of the battery.

[0106] In specific implementation, after determining the first current combination for determining the discharge power of the battery, the preset protection voltage corresponding to the first current combination can be determined as the target protection voltage through the correspondence between the first preset combination for determining the discharge power of the battery and the preset protection voltage.

[0107] Step S1025: Determine the discharge power of the battery based on the correspondence between the second preset combination for determining the discharge power of the battery and the discharge power of the preset battery, and the second current combination for determining the discharge power of the battery. The discharge power of the preset battery corresponding to the second current combination is determined as the discharge power of the battery. Herein, the second preset combination includes: the second preset single-cell voltage of the battery cell and the preset target protection voltage. The second current combination includes: the single-cell voltage of the battery cell and the target protection voltage.

[0108] The correspondence between the second preset combination for determining the discharge power of the battery and the discharge power of the preset battery can be a pre-calibrated correspondence. For example: the second preset combination K3 for determining the discharge power of the battery corresponds to the second preset protection voltage L4, and the second preset combination K4 for determining the discharge power of the battery corresponds to the second preset protection voltage L5.

[0109] The second current combination for determining the discharge power of the battery can indicate the influencing factors for determining the discharge power of the battery. The second current combination can include: the single-cell voltage of the battery cell and the target protection voltage. The second preset combination can include: the second preset single-cell voltage of the battery cell and the preset target protection voltage.

[0110] In specific implementation, after determining the second current combination for determining the discharge power of the battery, the discharge power of the preset battery corresponding to the second current combination can be determined as the discharge power of the battery according to the correspondence between the second preset combination for determining the discharge power of the battery and the discharge power of the preset battery.

[0111] In a possible implementation manner, when the ambient temperature is -25°C and the vehicle speed is 0 - 100 kw / h, the temperature of the first battery cell and the difference between the protection voltage corresponding to this battery cell and the preset protection voltage are within X mV. Through data analysis by the cloud, the ambient temperature, the discharge power of the battery, the temperature of the battery cell, and the relationship between the single-cell voltage of the battery cell and the preset protection voltage can be determined, so as to accurately determine the discharge power of the battery. Therefore, the ambient temperature, the single-cell voltage of the battery cell under the vehicle working condition, and the current temperature of the battery cell can be monitored by the cloud, and the cloud is used to analyze according to the ambient temperature, the single-cell voltage of the battery cell under the vehicle working condition, and the current temperature of the battery cell to determine the discharge power of the battery.

[0112] The method for determining the discharge power of the battery provided by the embodiments of the present disclosure can obtain the protection voltages under different first preset combinations according to the correspondence between the first preset combination for determining the discharge power of the battery and the preset protection voltage, accurately determine the target protection voltage corresponding to the first current combination according to the first current combination, and then accurately determine the discharge power of the battery according to the target protection voltage and the second current combination.

[0113] In this embodiment, a device for determining the discharge power of a battery is further provided. This device is used to implement the above embodiments and preferred implementation manners, and those that have been described will not be repeated here. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0114] This embodiment provides a device for determining the discharge power of a battery. The device includes: an acquisition module, configured to acquire associated data for determining the discharge power of the battery and the current temperature of a first battery cell in the battery cell set of the battery; wherein, the distance between the first battery cell and the side beam of the battery is less than a distance threshold, and the associated data includes: the ambient temperature of the environment where the battery is located and the driving speed of the vehicle equipped with the battery; a determination module, configured to determine the discharge power of the battery based on the associated data and the current temperature.

[0115] In a possible implementation manner, the determination module includes: a first determination unit, configured to determine the target temperature difference of the first battery cell based on the associated data and the current temperature; a second determination unit, configured to determine the target temperature of the battery according to the target temperature difference and the current temperature; a third determination unit, configured to determine the discharge power of the battery corresponding to the target temperature as the discharge power of the battery according to the corresponding relationship between the target temperature of the battery and the preset discharge power of the battery and the target temperature.

[0116] In a possible implementation manner, the associated data further includes: the side beam temperature of the battery, the current of the battery, and the single cell voltage; and the first determination unit includes: a first determination subunit, configured to determine the heat generated by the battery cells, the heat generated by mechanical components, and the external thermal management heat of the battery according to the current temperature, the side beam temperature, the current of the battery, the single cell voltage, and a preset battery cell heat generation power table; a second determination subunit, configured to determine the heat dissipation corresponding to the battery according to the ambient temperature and the driving speed of the vehicle; a third determination subunit, configured to determine the target temperature difference of the first battery cell based on the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation.

[0117] In a possible implementation, the third determination subunit includes: a first target determination unit, configured to determine a first target heat of the first battery cell according to the heat generated by the battery cell, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation; a second target determination unit, configured to determine, according to the mass of each part of the first battery cell, the first target heat of the first battery cell, and the specific heat capacity of the first battery cell, the temperature difference corresponding to each part of the first battery cell respectively, and determine a first maximum temperature difference and a first minimum temperature difference from the temperature differences corresponding to each part of the first battery cell; and a third target determination unit, configured to use the first maximum temperature difference and the first minimum temperature difference as the target temperature differences respectively.

[0118] In a possible implementation, the number of the first battery cells in the battery cell set is multiple, and the third determination subunit includes: a fourth target determination unit, configured to determine a second target heat of each first battery cell according to the heat generated by the battery cell, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation of each first battery cell respectively; a fifth target determination unit, configured to determine the temperature difference to be screened of each first battery cell respectively based on the second target heat of each first battery cell; wherein, the second battery cell is any one of the multiple first battery cells, and determining the temperature difference to be screened of the second battery cell specifically includes: determining the temperature difference of each part of the second battery cell according to the mass of each part of the second battery cell, the second target heat corresponding to the second battery cell, and the specific heat capacity of the second battery cell, and determining a second maximum temperature difference and a second minimum temperature difference of the second battery cell from the temperature differences of each part of the second battery cell; using the second maximum temperature difference and the second minimum temperature difference as the temperature differences to be screened of the second battery cell respectively; and a sixth target determination unit, configured to determine a third maximum temperature difference and a third minimum temperature difference from the temperature differences to be screened according to the temperature differences to be screened of each first battery cell, and use the third maximum temperature difference and the third minimum temperature difference as the target temperature differences of the battery cells respectively.

[0119] In a possible implementation, the determination module includes: a fourth determination unit configured to determine a target protection voltage by using a correspondence between a first preset combination for determining a discharge power of a battery and a preset protection voltage, and a first current combination for determining the discharge power of the battery; wherein the first current combination includes: an ambient temperature, a driving speed of the vehicle, a single cell voltage of the battery cell, and a current temperature; the first preset combination includes: a preset ambient temperature, a preset driving speed, a first preset single cell voltage of the battery cell, and a preset temperature; a fifth determination unit configured to determine a discharge power of the battery by using a correspondence between a second preset combination for determining the discharge power of the battery and a preset discharge power of the battery, and a second current combination for determining the discharge power of the battery; wherein the second preset combination includes: a second preset single cell voltage of the battery cell and a preset target protection voltage; the second current combination includes: a single cell voltage of the battery cell and a target protection voltage.

[0120] The further function descriptions of the above-mentioned modules and units are the same as those in the corresponding embodiments above, and will not be elaborated here.

[0121] The device for determining the discharge power of the battery in this embodiment is presented in the form of functional units. Here, the functional units refer to ASIC (Application Specific Integrated Circuit) circuits, processors and memories that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0122] The embodiment of the present application further provides a computer device having the above-mentioned device for determining the discharge power of the battery.

[0123] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a computer device provided by an alternative embodiment of the present application. As Figure 5 shown, the computer device includes: one or more processors 10, a memory 20, and an interface for connecting each component, including a high-speed interface and a low-speed interface. Each component communicates with each other through different buses and can be installed on a common main board or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (such as an array of servers, a set of blade servers, or a multi-processor system).Figure 5 Take a processor 10 as an example.

[0124] The processor 10 can be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above-mentioned hardware chip can be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above-mentioned programmable logic device can be a complex programmable logic device, a field-programmable gate array, a generic array logic, or any combination thereof.

[0125] Among them, the memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiments.

[0126] The memory 20 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the computer device, etc. In addition, the memory 20 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 can optionally include a memory remotely set relative to the processor 10, and these remote memories can be connected to the computer device through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and a combination thereof.

[0127] The memory 20 can include a volatile memory, such as a random access memory; the memory can also include a non-volatile memory, such as a flash memory, a hard disk, or a solid-state drive; the memory 20 can also include a combination of the above types of memories.

[0128] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 can be connected through a bus or other means, Figure 5 Take the connection through the bus as an example.

[0129] The input device 30 can receive input digital or character information, and generate key signal inputs related to the user settings and function controls of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointing stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 can include a display device, an auxiliary lighting device (such as an LED), and a tactile feedback device (such as a vibration motor), etc. The above display device includes but is not limited to a liquid crystal display, a light-emitting diode, a display, and a plasma display. In some alternative embodiments, the display device can be a touch screen.

[0130] The computer device further includes a communication interface for the computer device to communicate with other devices or a communication network.

[0131] Embodiments of the present application also provide a computer-readable storage medium. The methods according to the embodiments of the present application can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented as computer code originally stored in a remote storage medium or a non-transitory machine-readable storage medium and downloaded through a network and to be stored in a local storage medium, so that the methods described herein can be processed by such software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid-state drive, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by the computer, the processor, or the hardware, the methods shown in the above embodiments are implemented.

[0132] A part of the present application can be applied as a computer program product, such as computer program instructions. When executed by a computer, through the operation of the computer, the methods and / or technical solutions according to the present application can be invoked or provided. Those skilled in the art should be able to understand that the forms of existence of computer program instructions in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways for a computer to execute computer program instructions include, but are not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Herein, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to the computer.

[0133] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for determining the discharge power of a battery, characterized in that, The method includes: Obtaining associated data for determining the discharge power of the battery and the current temperature of the first battery cell in the battery cell set of the battery; wherein, the distance between the first battery cell and the side beam of the battery is less than a distance threshold, and the associated data includes: the ambient temperature of the environment where the battery is located and the driving speed of the vehicle equipped with the battery; Determining the discharge power of the battery based on the associated data and the current temperature.

2. The method for determining the discharge power of a battery according to claim 1, wherein Determining the discharge power of the battery based on the associated data and the current temperature includes: Determining the target temperature difference of the first battery cell based on the associated data and the current temperature; Determining the target temperature of the battery according to the target temperature difference and the current temperature; Determining the discharge power of the battery by using the discharge power corresponding to the target temperature of the preset battery and the target temperature according to the corresponding relationship between the target temperature of the battery and the preset discharge power of the battery.

3. The method for determining the discharge power of a battery according to claim 2, wherein, The associated data further includes: the side beam temperature of the battery, the current of the battery, and the voltage of the battery cell; and determining the target temperature difference of the first battery cell based on the associated data and the current temperature includes: Determining the heat generated by the battery cells, the heat generated by mechanical components, and the external thermal management heat of the battery according to the current temperature, the side beam temperature, the current of the battery, the voltage of the battery cell, and a preset battery cell heat generation power table; Determining the heat dissipation corresponding to the battery according to the ambient temperature and the driving speed of the vehicle; Determining the target temperature difference of the first battery cell based on the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation.

4. The method for determining the discharge power of a battery according to claim 3, wherein Determining the target temperature difference of the first battery cell based on the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation includes: Determining the first target heat of the first battery cell according to the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation; Respectively determining the temperature difference corresponding to each part of the first battery cell according to the mass of each part of the first battery cell, the first target heat of the first battery cell, and the specific heat capacity of the first battery cell, and determining the first maximum temperature difference and the first minimum temperature difference from the temperature differences corresponding to each part of the first battery cell; wherein, the first battery cell is composed of the multiple parts; Using the first maximum temperature difference and the first minimum temperature difference as the target temperature difference respectively.

5. The method for determining the discharge power of a battery according to claim 3, characterized in that, The number of the first battery cells in the battery cell set is multiple; and determining the target temperature difference of the first battery cell based on the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation includes: Respectively determining the second target heat of each first battery cell according to the heat generated by the battery cells, the heat generated by mechanical components, the external thermal management heat, and the heat dissipation of each first battery cell; Based on the second target heat of each first battery cell, determine the temperature difference to be screened for each first battery cell respectively; wherein, the second battery cell is any one of the multiple first battery cells, and determining the temperature difference to be screened for the second battery cell specifically includes: according to the mass of each part of the second battery cell, the second target heat corresponding to the second battery cell, and the specific heat capacity of the second battery cell, determine the temperature difference of each part of the second battery cell respectively, and determine the second maximum temperature difference and the second minimum temperature difference of the second battery cell from the temperature differences of each part of the second battery cell; use the second maximum temperature difference and the second minimum temperature difference as the temperature differences to be screened for the second battery cell respectively; Determine the third maximum temperature difference and the third minimum temperature difference from the temperature differences to be screened for each first battery cell, and use the third maximum temperature difference and the third minimum temperature difference as the target temperature differences of the battery cell respectively.

6. The method for determining the discharge power of a battery according to claim 1, wherein The associated data further includes: the voltage of the battery cell corresponding to the vehicle condition; determining the discharge power of the battery based on the associated data and the current temperature includes: According to the correspondence between the first preset combination for determining the discharge power of the battery and the preset protection voltage, and the first current combination for determining the discharge power of the battery, determine the preset protection voltage corresponding to the first current combination as the target protection voltage; wherein, the first current combination includes: the ambient temperature, the driving speed of the vehicle, the voltage of the battery cell, and the current temperature; the first preset combination includes: the preset ambient temperature, the preset driving speed, the first preset voltage of the battery cell, and the preset temperature; According to the correspondence between the second preset combination for determining the discharge power of the battery and the preset discharge power of the battery, and the second current combination for determining the discharge power of the battery, determine the preset discharge power of the battery corresponding to the second current combination as the discharge power of the battery; wherein, the second preset combination includes: the second preset voltage of the battery cell and the preset target protection voltage; the second current combination includes: the voltage of the battery cell and the target protection voltage.

7. A device for determining the discharge power of a battery, characterized in that, The device includes: An acquisition module, configured to acquire the associated data for determining the discharge power of the battery and the current temperature of the first battery cell in the battery cell set of the battery; wherein, the distance between the first battery cell and the side beam of the battery is less than the distance threshold, and the associated data includes: the ambient temperature of the environment where the battery is located and the driving speed of the vehicle equipped with the battery; A determination module, configured to determine the discharge power of the battery based on the associated data and the current temperature.

8. A computer device, characterized in that, Includes: A memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the method for determining the discharge power of the battery according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, Computer instructions are stored on the computer-readable storage medium, and the computer instructions are used to cause a computer to execute the method for determining the discharge power of the battery according to any one of claims 1 to 6.

10. A computer program product, characterized in that, Comprising computer instructions for causing a computer to execute the method for determining the discharge power of a battery according to any one of claims 1 to 6.

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