Battery temperature determination method and device, medium, electronic equipment and program product

Abstract

The invention relates to a battery temperature determination method and device, a medium, electronic equipment and a program product. The method comprises the following steps: acquiring a first charging parameter of a battery in a process of rising from a first SOC to a second SOC under a preset environment temperature and an initial charging rate; determining the specific heat capacity of the battery at the preset environment temperature according to the first charging parameter; acquiring a second charging parameter of the battery in the process of rising from the first SOC to the second SOC under the preset environment temperature and the target charging rate; and according to the battery specific heat capacity and the second charging parameter at the preset environment temperature, determining the highest battery temperature when the battery is charged at the target charging rate at the preset environment temperature. Therefore, the maximum battery temperature of the battery when the battery is charged at the target charging rate at the preset environment temperature can be simply and quickly obtained, the actual test and simulation time is saved, and a theoretical basis is provided for the subsequent updating of a battery cell and the design of a charging strategy.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and in particular, to a method, device, medium, electronic device and program product for determining battery temperature. Background Art

[0002] At present, natural cooling is mostly used in the commercial vehicle field due to cost and the large heat dissipation space of the battery box. As the competitiveness of vehicle charging time increases in the market, the battery needs to have a higher charging rate to shorten the charging time and improve market competitiveness. Increasing the charging rate will lead to an increase in battery temperature. In order to ensure the safety of the battery after the charging rate is increased, it is necessary to evaluate the battery temperature rise during the charging process.

[0003] At present, there are generally two ways to evaluate the temperature rise of batteries during charging: actual measurement and simulation. The actual measurement method is to charge the battery at different ambient temperatures on a battery test bench to directly obtain the battery temperature rise, but the actual measurement method is inefficient, involves a large amount of test resource coordination, and has a long test cycle. The simulation method is mainly based on the RC equivalent circuit principle to build a cell and system heat generation model, input charging strategy and thermal management strategy to simulate battery temperature rise, but the maturity of the simulation model requires a large amount of data for training and verification, and the time cost is also high. Summary of the invention

[0004] The purpose of the present disclosure is to provide a battery temperature determination method, device, medium, electronic device and program product to efficiently determine the maximum battery temperature when the battery is charged at a new charging rate, providing a theoretical basis for the design of batteries and charging strategies.

[0005] In order to achieve the above object, the present disclosure provides a first aspect of a battery temperature determination method, comprising: Acquire a first charging parameter of the battery during a process in which the battery increases from a first SOC to a second SOC under a preset ambient temperature and an initial charging rate; Determining the specific heat capacity of the battery at the preset ambient temperature according to the first charging parameter; Acquire a second charging parameter of the battery during a process in which the battery increases from the first SOC to the second SOC under the preset ambient temperature and the target charging rate, wherein a first internal resistance in the first charging parameter is different from a second internal resistance in the second charging parameter; The maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature is determined according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter.

[0006] Optionally, the first charging parameter includes a first charging current, a first charging time, a first temperature rise value, a battery weight, and a first internal resistance; and determining the battery specific heat capacity at the preset ambient temperature according to the first charging parameter includes: determining a first calorific value of the battery according to the first charging current, the first internal resistance, and the first charging time; The specific heat capacity of the battery at the preset ambient temperature is determined according to the first calorific value, the first temperature rise value, and the battery weight.

[0007] Optionally, the second charging parameter includes a second charging current, a second charging time, and a second internal resistance; and determining, according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter, the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature, comprises: determining a second calorific value of the battery according to the second charging parameter; determining a second temperature rise value of the battery according to the second calorific value, the battery specific heat capacity and the battery weight; The sum of the second temperature rise value and an initial temperature is determined as the maximum battery temperature, wherein the initial temperature is the temperature of the battery at the start of charging.

[0008] Optionally, the first internal resistance is the battery internal resistance when the pulse charging current is the first charging current at the preset ambient temperature and the third SOC; the second internal resistance is the battery internal resistance when the pulse charging current is the second charging current at the preset ambient temperature and the third SOC, wherein the third SOC is greater than the first SOC, and the third SOC is less than the second SOC.

[0009] Optionally, the method further comprises: If the maximum battery temperature is greater than or equal to the temperature threshold, a thermal management strategy is initiated, and when the thermal management strategy is initiated, the steps of obtaining a first charging parameter in a process in which the battery is increased from a first SOC to a second SOC at a preset ambient temperature and an initial charging rate to determining a maximum battery temperature when the battery is charged at a target charging rate at the preset ambient temperature according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter are re-executed; If the re-determined maximum battery temperature is still greater than or equal to the temperature threshold when the thermal management strategy is activated, a prompt message is generated, which is used to prompt optimization of the current thermal management strategy or to prompt replacement of the current battery cell with a different type of battery cell.

[0010] Optionally, the method further comprises: If the maximum battery temperature is less than the temperature threshold, the preset ambient temperature is controlled to increase, the increased preset ambient temperature is used to replace the original preset ambient temperature, and the steps of obtaining the first charging parameter in the process of the battery rising from the first SOC to the second SOC under the preset ambient temperature and the initial charging rate are re-executed to determining the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter; If the highest battery temperature of the battery when charged at the target charging rate under the increased preset ambient temperature is less than the temperature threshold, it is determined that there is no overtemperature risk when the battery is charged at the target charging rate.

[0011] A second aspect of the present disclosure provides a battery temperature determination device, comprising: A first acquisition module is used to acquire a first charging parameter of the battery during a process in which the battery increases from a first SOC to a second SOC under a preset ambient temperature and an initial charging rate; A first determining module, configured to determine the specific heat capacity of the battery at the preset ambient temperature according to the first charging parameter; A second acquisition module is used to acquire a second charging parameter of the battery during a process in which the first SOC of the battery increases to the second SOC under the preset ambient temperature and the target charging rate, wherein a first internal resistance in the first charging parameter is different from a second internal resistance in the second charging parameter; The second determining module is used to determine the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter.

[0012] A third aspect of the present disclosure provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method provided in the first aspect of the present disclosure.

[0013] A fourth aspect of the present disclosure provides an electronic device, including: a memory having a computer program stored thereon; A processor is used to execute a computer program in a memory to implement the steps of the method provided in the first aspect of the present disclosure.

[0014] A fifth aspect of the present disclosure provides a computer program product, including a computer program, which implements the steps provided in the first aspect of the disclosure when executed by a processor.

[0015] Through the above technical solution, the first charging parameter of the battery in the process of rising from the first SOC to the second SOC under the preset ambient temperature and the initial charging rate is obtained; the specific heat capacity of the battery at the preset ambient temperature is determined according to the first charging parameter; the second charging parameter of the battery in the process of rising from the first SOC to the second SOC under the preset ambient temperature and the target charging rate is obtained; the maximum battery temperature of the battery when charged at the target charging rate at the preset ambient temperature is determined according to the specific heat capacity of the battery at the preset ambient temperature and the second charging parameter, wherein the first internal resistance in the first charging parameter and the second internal resistance in the second charging parameter are different. In this way, the maximum battery temperature of the battery when charged at the target charging rate at the preset ambient temperature can be obtained simply and quickly, saving the time of actual testing and simulation, and providing a theoretical basis for the subsequent design of battery updates and charging strategies.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a flow chart of a method for determining battery temperature provided by an exemplary embodiment of the present disclosure.

[0018] Figure 2 is a flow chart of a method for determining battery temperature provided by an exemplary embodiment of the present disclosure.

[0019] Figure 3 is a block diagram of a battery temperature determination device provided by an exemplary embodiment of the present disclosure.

[0020] Figure 4 is a block diagram of an electronic device provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] Figure 1 FIG. 1 is a flow chart of a method for determining battery temperature provided by an exemplary embodiment of the present disclosure. Figure 1 As shown, the method may include S101 to S104.

[0023] S101, obtaining a first charging parameter of a battery during a process in which a first SOC of the battery increases to a second SOC of the battery under a preset ambient temperature and an initial charging rate.

[0024] For example, the preset ambient temperature can be preset based on actual needs, for example, it can be set to 25°C. The initial charging rate can be a safe charging rate that the battery can reach, for example, it can be 1C. The values ​​of the first SOC and the second SOC can be preset based on actual needs, wherein the first SOC can be set to 20% and the second SOC can be set to 80% or 100%.

[0025] For example, the first charging parameter may include a first charging current, a first charging time, a first temperature rise value, a battery weight, and a first internal resistance.

[0026] The first charging time and the first temperature rise value may be parameters respectively acquired in real time by a timer and a temperature sensor in the process of controlling the battery to rise from a first SOC to a second SOC under a preset ambient temperature and an initial charging rate.

[0027] The first charging current may be determined based on a charging MAP of a pre-calibrated initial charging rate, a first SOC, and a second SOC. The charging MAP includes a corresponding relationship between an ambient temperature, an SOC, and a charging current. For example, the first charging current may be an average current value between the first SOC and the second SOC under the charging MAP. Alternatively, in a process where the battery is controlled to rise from the first SOC to the second SOC under a preset ambient temperature and an initial charging rate, the average value of the charging current is determined as the first charging current.

[0028] The first internal resistance may be the battery internal resistance when the pulse charging current is the first charging current at a preset ambient temperature and a third SOC. For example, the HPPC (Hybrid Pulse Power Characterization) method may be used to test and obtain the battery internal resistance when the pulse charging current is the first charging current at a preset ambient temperature and a third SOC, and the value of the internal resistance may be determined as the first internal resistance. The value of the third SOC may be preset based on actual needs, the third SOC is greater than the first SOC, and the third SOC is less than the second SOC. For example, the third SOC may be set to 50%.

[0029] S102: Determine the specific heat capacity of the battery at a preset ambient temperature according to the first charging parameter.

[0030] For example, the first charging parameter can be input into a pre-trained specific heat capacity determination model to obtain the specific heat capacity of the battery at the preset ambient temperature output by the model. The model can be stored locally in the electronic device and called locally each time it is used, or can be stored on a third-party platform and called from the third party each time it is used, which is not specifically limited here.

[0031] S103, obtaining a second charging parameter in a process in which the battery is charged from a first SOC to a second SOC under a preset ambient temperature and a target charging rate.

[0032] For example, the target charging rate may be greater than the initial charging rate, for example, may be set to 1.5 C. The second charging parameter may include a second charging current, a second charging time, and a second internal resistance.

[0033] The first internal resistance in the first charging parameter and the second internal resistance in the second charging parameter are different, and the second charging time may be an estimated value obtained based on the target charging rate.

[0034] The second charging current may be determined based on a charging MAP of a pre-calibrated target charging rate, the first SOC, and the second SOC. The charging MAP also includes a corresponding relationship between the ambient temperature, the SOC, and the charging current. For example, the second charging current may be an average current value between the first SOC and the second SOC under the charging MAP. Alternatively, in the process of controlling the battery to rise from the first SOC to the second SOC under a preset ambient temperature and a target charging rate, the average value of the charging current is determined as the second charging current.

[0035] The second internal resistance may be the battery internal resistance when the pulse charging current is the second charging current at the preset ambient temperature and the third SOC. For example, the battery internal resistance when the pulse charging current is the second charging current at the preset ambient temperature and the third SOC may be obtained by testing using the HPPC method, and the value of the internal resistance may be determined as the second internal resistance.

[0036] In the process of acquiring the first charging parameter and the second charging parameter for the first time, the thermal management strategy of the battery management system may not be started to reduce the consumption of operating energy as much as possible.

[0037] S104, determining a maximum battery temperature when the battery is charged at a target charging rate at the preset ambient temperature according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter.

[0038] For example, the battery specific heat capacity at a preset ambient temperature and the second charging parameter can be used to obtain the temperature rise value of the battery during the process of the battery rising from the first SOC to the second SOC at the preset ambient temperature and the target charging rate, and then the maximum battery temperature in the process can be obtained. In this way, the demand for data that needs to be obtained through actual testing can be reduced, and there is no need to train and verify with a large amount of data as in the simulation method in the related art, so that the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature can be obtained simply and quickly, saving time and cost and having strong feasibility. The obtained maximum battery temperature can be used for the over-temperature risk assessment of the battery in the early stage of the battery charging strategy upgrade, providing a theoretical basis for the thermal management method or battery cell selection, and reducing the test items and shortening the test cycle as much as possible.

[0039] Through the above technical solution, the first charging parameter of the battery in the process of rising from the first SOC to the second SOC under the preset ambient temperature and the initial charging rate is obtained; the specific heat capacity of the battery at the preset ambient temperature is determined according to the first charging parameter; the second charging parameter of the battery in the process of rising from the first SOC to the second SOC under the preset ambient temperature and the target charging rate is obtained; the maximum battery temperature of the battery when charged at the target charging rate at the preset ambient temperature is determined according to the specific heat capacity of the battery at the preset ambient temperature and the second charging parameter, wherein the first internal resistance in the first charging parameter and the second internal resistance in the second charging parameter are different. In this way, the maximum battery temperature of the battery when charged at the target charging rate at the preset ambient temperature can be obtained simply and quickly, saving the time of actual testing and simulation, and providing a theoretical basis for the subsequent design of battery updates and charging strategies.

[0040] Figure 2 is a flow chart of a method for determining battery temperature provided by an exemplary embodiment of the present disclosure.

[0041] like Figure 2 As shown, step S102 may include S1021 and S1022.

[0042] S1021, determining a first heating value of the battery according to a first charging current, a first internal resistance, and a first charging time.

[0043] For example, the square of the first charging current multiplied by the first internal resistance and the first charging time can be determined as the first heating value of the battery. The first heating value is the heating value of the battery when the battery rises from the first SOC to the second SOC at the preset ambient temperature and the initial charging rate. Specifically, the first heating value of the battery is determined by the following formula: :

[0044] in, is the first charging current, is the first internal resistance, This is the first charging time.

[0045] S1022, determining the specific heat capacity of the battery at a preset ambient temperature according to the first heating value, the first temperature rise value and the battery weight.

[0046] For example, the specific heat capacity of the battery at a preset ambient temperature can be determined by the following formula: :

[0047] in, is the first temperature rise value, is the battery weight.

[0048] In this way, by considering the battery as a resistor, the battery specific heat capacity at a preset ambient temperature can be determined simply and quickly.

[0049] like Figure 2 As shown, step S104 may include S1041 to S1043.

[0050] S1041: Determine a second heating value of the battery according to a second charging parameter.

[0051] For example, the second heating value of the battery can be determined by multiplying the square of the second charging current by the second internal resistance and the second charging time. The second heating value is the heating value of the battery when the battery rises from the first SOC to the second SOC under the preset ambient temperature and the target charging rate. Specifically, the second heating value of the battery is determined by the following formula: :

[0052] in, is the second charging current, is the second internal resistance, It is the second charging time.

[0053] S1042: Determine a second temperature rise value of the battery according to the second calorific value, the battery specific heat capacity, and the battery weight.

[0054] For example, the second temperature rise value is the temperature rise value obtained by calculation and estimation during the process of the battery rising from the first SOC to the second SOC under the preset ambient temperature and the target charging rate. The battery specific heat capacity is affected by the battery cell system and structure. When the battery cell system and structure remain unchanged and the external ambient temperature remains unchanged, the influence of other factors on the battery specific heat capacity is small and almost negligible. Therefore, in order to simplify the calculation process and efficiently determine the second temperature rise value, the second temperature rise value of the battery is determined by the following formula: :

[0055] S1043: Determine the sum of the second temperature rise value and the initial temperature as the maximum battery temperature.

[0056] The initial temperature is the temperature of the battery at the start of charging, which can be obtained by a temperature sensor pre-set on the battery or defaulted to be equal to a preset ambient temperature.

[0057] For example, the battery heat is continuously accumulated during the charging process, so the sum of the second temperature rise value and the initial temperature can be determined as the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature. In this way, the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature can be determined simply and quickly.

[0058] In an optional embodiment, after determining the maximum battery temperature when the battery is charged at the target charging rate under the current preset ambient temperature, the battery temperature determination method provided by the present disclosure may further include: If the maximum battery temperature is greater than or equal to the temperature threshold, the thermal management strategy is activated, and when the thermal management strategy is activated, the steps of obtaining the first charging parameter in the process of the battery rising from the first SOC to the second SOC under the preset ambient temperature and the initial charging rate to determining the maximum battery temperature when the battery is charged at the target charging rate under the preset ambient temperature according to the battery specific heat capacity under the preset ambient temperature and the second charging parameter are re-executed; If the re-determined maximum battery temperature is still greater than or equal to the temperature threshold when the thermal management strategy is activated, a prompt message is generated, which is used to prompt optimization of the current thermal management strategy or to prompt replacement of the current battery cell with a different type of battery cell.

[0059] For example, the temperature threshold may be determined based on a maximum temperature that the battery can withstand and a safety margin. Specifically, the difference between the maximum temperature that the battery can withstand and the safety margin may be determined as the temperature threshold.

[0060] If the maximum battery temperature is greater than or equal to the temperature threshold, it can be determined that there is an overtemperature risk when the battery is charged at the target charging rate at the current preset ambient temperature, that is, the charging process of the battery at the current temperature is not safe. At this time, the thermal management strategy can be activated and the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature can be re-determined.

[0061] If the re-determined maximum battery temperature is still greater than or equal to the temperature threshold when the thermal management strategy is started, it can be determined that the current thermal management strategy cannot solve the battery overheating situation in this case. At this time, a prompt message can be generated. The prompt message can prompt relevant personnel to redesign the thermal management strategy, or prompt relevant personnel to replace the battery with a high-power fast charging capability. In this way, the generation of prompt messages can provide a theoretical basis for subsequent battery updates and charging strategy designs, thereby avoiding the risk of overheating when the battery is charged at the target charging rate at the current preset ambient temperature. Among them, the thermal management strategy can be to switch natural cooling to liquid cooling.

[0062] As for whether to adopt the means of optimizing the thermal management strategy or replacing the current battery cells with different types of battery cells, it can be selected based on the development cost, cycle, and complexity, and there is no restriction here.

[0063] In an optional embodiment, after determining the maximum battery temperature when the battery is charged at the target charging rate under the current preset ambient temperature, the battery temperature determination method provided by the present disclosure may further include: If the highest battery temperature is less than the temperature threshold, the preset ambient temperature is controlled to increase, and the increased preset ambient temperature replaces the original preset ambient temperature; then, the steps S101 to S104 are re-executed; If the highest battery temperature when the battery is charged at the target charge rate under the increased preset ambient temperature is less than the temperature threshold, it is determined that there is no overtemperature risk when the battery is charged at the target charge rate.

[0064] For example, if the maximum battery temperature is less than the temperature threshold, it can be determined that there is no overheating risk when the battery is charged at the target charging rate at the current preset ambient temperature, that is, the charging process of the battery at the current temperature is safe.

[0065] Although the possibility of high-temperature charging is low, there is still a certain probability, and the possibility of battery charging being dangerous under high-temperature conditions is higher. Therefore, the preset ambient temperature can be controlled to increase, and the increased preset ambient temperature replaces the original preset ambient temperature, and steps S101 to S104 are re-executed. After that, it is determined whether there is an overtemperature risk when the battery is charged at the target charging rate under the increased preset ambient temperature. The specific process of re-executing steps S101 to S104 is as follows: Obtain a first charging parameter in the process of the battery rising from a first SOC to a second SOC under an increased preset ambient temperature and an initial charging rate; determine the battery specific heat capacity at the increased preset ambient temperature based on the first charging parameter at the increased preset ambient temperature; obtain a second charging parameter in the process of the battery rising from a first SOC to a second SOC under the increased preset ambient temperature and a target charging rate; determine the maximum battery temperature when the battery is charged at the target charging rate at the increased preset ambient temperature based on the battery specific heat capacity at the increased preset ambient temperature and the second charging parameter.

[0066] The specific implementation of the above steps has been described in detail above, and the repeated contents will not be repeated here.

[0067] If the highest battery temperature when the battery is charged at the target charging rate under the increased preset ambient temperature is less than the temperature threshold, it can be determined that there is no over-temperature risk when the battery is charged at the target charging rate under the increased preset ambient temperature, that is, the charging process of the battery at high temperature is safe. At this time, it can be determined that there is no over-temperature risk when the battery is charged at the target charging rate.

[0068] If the maximum battery temperature when the battery is charged at the target charging rate at the increased preset ambient temperature is greater than or equal to the temperature threshold, it can be determined that there is an overtemperature risk when the battery is charged at the target charging rate at the increased preset ambient temperature. At this time, the thermal management strategy can be started and the maximum battery temperature when the battery is charged at the target charging rate at the increased preset ambient temperature can be re-determined. If the re-determined maximum battery temperature when charging at the target charging rate at the increased preset ambient temperature is still greater than or equal to the temperature threshold when the thermal management strategy is started, a prompt message can also be generated. The prompt message is used to prompt the optimization of the current thermal management strategy, or to prompt the replacement of the battery cell of the current battery with a different type of battery cell. In this way, the generation of the prompt message can provide a theoretical basis for the subsequent update of the battery and the design of the charging strategy, thereby avoiding the risk of overheating when the battery is charged at the target charging rate at the increased preset ambient temperature.

[0069] In another optional embodiment, after determining the maximum battery temperature when the battery is charged at the target charging rate under the current preset ambient temperature, the battery temperature determination method provided by the present disclosure may further include: If the highest battery temperature is less than the temperature threshold, the preset ambient temperature is controlled to be changed multiple times, and the changed preset ambient temperature is used to replace the original preset ambient temperature each time; then, the steps S101 to S104 are re-executed; If the maximum battery temperature of the battery when charging at the target charging rate at any preset ambient temperature after any change is greater than or equal to the temperature threshold, the thermal management strategy is activated, or the battery cell of the current battery is replaced with a battery cell of a different model; If the maximum battery temperature when the battery is charged at the target charging rate under the preset ambient temperature after each change is always less than the temperature threshold and the number of changes reaches the number threshold, it is determined that there is no overtemperature risk when the battery is charged at the target charging rate.

[0070] For example, controlling the preset ambient temperature change may be controlling the preset ambient temperature to increase or decrease, which is not limited here. The number threshold may be preset based on actual needs, for example, it may be set to 3 times. In this way, by changing the preset ambient temperature multiple times, the reliability of the determination result of whether there is an overtemperature risk when the battery is charged at the target charging rate can be further improved.

[0071] Based on the same inventive concept, the present disclosure also provides a battery temperature determination device. Figure 3 FIG. 3 is a block diagram of a battery temperature determination device 300 provided by an exemplary embodiment of the present disclosure. Figure 3 , the battery temperature determination device 300 may include: The first acquisition module 301 is used to acquire a first charging parameter of a battery during a process of increasing from a first SOC to a second SOC under a preset ambient temperature and an initial charging rate; A first determining module 302, configured to determine the specific heat capacity of the battery at the preset ambient temperature according to the first charging parameter; A second acquisition module 303 is used to acquire a second charging parameter of the battery during a process in which the battery increases from the first SOC to the second SOC under the preset ambient temperature and the target charging rate, wherein the first internal resistance in the first charging parameter is different from the second internal resistance in the second charging parameter; The second determining module 304 is configured to determine, according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter, a maximum battery temperature when the battery is charged at a target charging rate at the preset ambient temperature.

[0072] In this way, the maximum battery temperature when the battery is charged at a target charging rate under a preset ambient temperature can be obtained simply and quickly, saving time for actual testing and simulation, and providing a theoretical basis for subsequent battery updates and charging strategy designs.

[0073] Optionally, the first charging parameter includes a first charging current, a first charging time, a first temperature rise value, a battery weight and a first internal resistance; the first determining module 302 is used to determine the battery specific heat capacity at the preset ambient temperature in the following manner: determining a first calorific value of the battery according to the first charging current, the first internal resistance, and the first charging time; The specific heat capacity of the battery at the preset ambient temperature is determined according to the first calorific value, the first temperature rise value, and the battery weight.

[0074] Optionally, the second charging parameter includes a second charging current, a second charging time, and a second internal resistance; the second determining module 304 is used to determine the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature by: determining a second calorific value of the battery according to the second charging parameter; determining a second temperature rise value of the battery according to the second calorific value, the battery specific heat capacity and the battery weight; The sum of the second temperature rise value and an initial temperature is determined as the maximum battery temperature, wherein the initial temperature is the temperature of the battery at the start of charging.

[0075] Optionally, the first internal resistance is the internal resistance of the battery when the pulse charging current is the first charging current at the preset ambient temperature and the third SOC; The second internal resistance is the battery internal resistance when the pulse charging current is the second charging current at the preset ambient temperature and the third SOC, wherein the third SOC is greater than the first SOC, and the third SOC is less than the second SOC.

[0076] Optionally, the device 300 further includes: A first control module, configured to activate a thermal management strategy if the maximum battery temperature is greater than or equal to a temperature threshold, and re-control the first acquisition module 301 to the second determination module 304 to re-execute corresponding steps when the thermal management strategy is activated; The prompt module is used to generate a prompt message if the re-determined maximum battery temperature is still greater than or equal to the temperature threshold when the thermal management strategy is started. The prompt message is used to prompt the optimization of the current thermal management strategy or to prompt the replacement of the current battery cell with a different type of battery cell.

[0077] Optionally, the device 300 further includes: A second control module is used for controlling the preset ambient temperature to increase if the maximum battery temperature is less than the temperature threshold, replacing the original preset ambient temperature with the increased preset ambient temperature, and then controlling the first acquisition module 301 to the second determination module 304 to re-execute corresponding steps; The third determination module is used to determine that there is no overtemperature risk when the battery is charged at the target charging rate if the highest battery temperature when the battery is charged at the target charging rate under the increased preset ambient temperature is less than the temperature threshold.

[0078] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0079] Figure 4 FIG. 7 is a block diagram of an electronic device 700 according to an exemplary embodiment. Figure 4 As shown, the electronic device 700 may include: a processor 701 , a memory 702 . The electronic device 700 may also include one or more of a multimedia component 703 , an input / output (I / O) interface 704 , and a communication component 705 .

[0080] The processor 701 is used to control the overall operation of the electronic device 700 to complete all or part of the steps in the above-mentioned battery temperature determination method. The memory 702 is used to store various types of data to support the operation of the electronic device 700. For example, these data may include instructions for any application or method used to operate on the electronic device 700, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 703 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 702 or sent through the communication component 705. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, and the above-mentioned other interface modules may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 705 may include: Wi-Fi module, Bluetooth module, NFC module.

[0081] In an exemplary embodiment, the electronic device 700 may be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned battery temperature determination method.

[0082] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned battery temperature determination method are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 702 including program instructions, and the above-mentioned program instructions can be executed by the processor 701 of the electronic device 700 to complete the above-mentioned battery temperature determination method.

[0083] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a processor. When the computer program is executed by the processor, the steps of the above-mentioned battery temperature determination method are implemented.

[0084] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0085] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0086] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for determining battery temperature, characterized in that: include: Acquire a first charging parameter of the battery during a process in which the battery increases from a first SOC to a second SOC under a preset ambient temperature and an initial charging rate; Determining the specific heat capacity of the battery at the preset ambient temperature according to the first charging parameter; Acquire a second charging parameter of the battery during a process in which the battery increases from the first SOC to the second SOC under the preset ambient temperature and the target charging rate, wherein a first internal resistance in the first charging parameter is different from a second internal resistance in the second charging parameter; The maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature is determined according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter.

2. The method according to claim 1, characterized in that The first charging parameter includes a first charging current, a first charging time, a first temperature rise value, a battery weight, and a first internal resistance; and determining the battery specific heat capacity at the preset ambient temperature according to the first charging parameter includes: determining a first calorific value of the battery according to the first charging current, the first internal resistance, and the first charging time; The specific heat capacity of the battery at the preset ambient temperature is determined according to the first calorific value, the first temperature rise value, and the battery weight.

3. The method according to claim 2, characterized in that The second charging parameter includes a second charging current, a second charging time, and a second internal resistance; and determining, according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter, the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature, includes: determining a second calorific value of the battery according to the second charging parameter; determining a second temperature rise value of the battery according to the second calorific value, the battery specific heat capacity and the battery weight; The sum of the second temperature rise value and an initial temperature is determined as the maximum battery temperature, wherein the initial temperature is the temperature of the battery at the start of charging.

4. The method according to claim 3, characterized in that The first internal resistance is the internal resistance of the battery when the pulse charging current is the first charging current at the preset ambient temperature and the third SOC; The second internal resistance is the battery internal resistance when the pulse charging current is the second charging current at the preset ambient temperature and the third SOC, wherein the third SOC is greater than the first SOC, and the third SOC is less than the second SOC.

5. The method according to claim 1, characterized in that The method further comprises: If the maximum battery temperature is greater than or equal to the temperature threshold, a thermal management strategy is initiated, and when the thermal management strategy is initiated, the steps of obtaining a first charging parameter in a process in which the battery is increased from a first SOC to a second SOC at a preset ambient temperature and an initial charging rate to determining a maximum battery temperature when the battery is charged at a target charging rate at the preset ambient temperature according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter are re-executed; If the re-determined maximum battery temperature is still greater than or equal to the temperature threshold when the thermal management strategy is activated, a prompt message is generated, which is used to prompt optimization of the current thermal management strategy or to prompt replacement of the current battery cell with a different type of battery cell.

6. The method according to claim 5, characterized in that The method further comprises: If the maximum battery temperature is less than the temperature threshold, the preset ambient temperature is controlled to increase, the increased preset ambient temperature is used to replace the original preset ambient temperature, and the steps of obtaining the first charging parameter in the process of the battery rising from the first SOC to the second SOC under the preset ambient temperature and the initial charging rate are re-executed to determining the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter; If the highest battery temperature of the battery when charged at the target charging rate under the increased preset ambient temperature is less than the temperature threshold, it is determined that there is no overtemperature risk when the battery is charged at the target charging rate.

7. A battery temperature determination device, characterized in that: include: A first acquisition module is used to acquire a first charging parameter of the battery during a process in which the battery increases from a first SOC to a second SOC under a preset ambient temperature and an initial charging rate; A first determining module, configured to determine the specific heat capacity of the battery at the preset ambient temperature according to the first charging parameter; A second acquisition module is used to acquire a second charging parameter of the battery in the process of increasing the SOC from the first SOC to the second SOC under the preset ambient temperature and the target charging rate, wherein the first internal resistance in the first charging parameter is different from the second internal resistance in the second charging parameter; The second determination module is used to determine the maximum battery temperature when the battery is charged at the target charging rate at the preset ambient temperature according to the battery specific heat capacity at the preset ambient temperature and the second charging parameter.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 6 are implemented.

9. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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