A method, apparatus, device, and storage medium for determining the lifespan of a battery module.

Abstract

This invention discloses a method, apparatus, device, and storage medium for determining the lifespan of a battery module. The method includes: determining the maximum temperature difference between the cells of the battery module; determining the cell degradation coefficient based on the maximum temperature difference; acquiring the operating parameters of the battery module; determining the capacity degradation of the battery module based on the operating parameters; and determining the lifespan of the battery module based on the cell degradation coefficient and the capacity degradation. In this method, the cell degradation coefficient is determined by the maximum temperature difference between the cells, and then the lifespan of the battery module is determined based on the cell degradation coefficient and the capacity degradation. This correlates the lifespan of the battery module with the temperature difference between the cells in the battery module, improving the accuracy of battery module lifespan prediction.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to battery technology, and in particular to a battery module life determination method, device, equipment and storage medium. BACKGROUND

[0002] In recent years, lithium ion batteries have been widely used in new energy vehicles and grid energy storage fields. However, irreversible performance degradation occurs in lithium ion batteries during use. Lithium ion batteries are a complex electrochemical system, and during operation, side reactions such as SEI film growth, lithium precipitation and electrolyte oxidation occur. The battery side reactions will cause the performance degradation of the battery, which is manifested in the macroscopic aspects of capacity reduction and internal resistance increase, thereby reducing the service life of the battery.

[0003] Accurate prediction of the service life of lithium ion batteries under different use conditions not only ensures the safe and reliable operation of the system, but also maximizes the use of the residual value of lithium ion batteries. At present, most of the relationship between the temperature difference between the cells in the lithium ion battery (module) and the life is only a qualitative concept, that is, the smaller the temperature difference, the better the life. The quantitative relationship between temperature difference and life has not been fully studied, which has caused the problem of different degrees of deviation in the prediction of the life of lithium ion batteries under different working conditions. SUMMARY

[0004] The present application provides a battery module life determination method, device, equipment and storage medium to improve the accuracy of battery module life prediction.

[0005] In a first aspect, the embodiments of the present application provide a battery module life determination method, comprising:

[0006] determining the maximum temperature difference between the cells of the battery module, and determining the cell attenuation coefficient according to the maximum temperature difference;

[0007] obtaining the working condition parameters of the battery module, and determining the capacity attenuation of the battery module according to the working condition parameters;

[0008] determining the life of the battery module according to the cell attenuation coefficient and the capacity attenuation.

[0009] Optionally, the cell-module attenuation model is used to determine the cell attenuation coefficient according to the maximum temperature difference;

[0010] determining the cell-module attenuation model comprises:

[0011] controlling the cell temperature difference of the test group battery module, and using the same cycle test conditions to test the test group battery module and the control group battery module except for the cell temperature difference;

[0012] obtaining a capacity attenuation of the test battery module, denoted as a first capacity attenuation, and obtaining a capacity attenuation of the control battery module, denoted as a second capacity attenuation;

[0013] determining the cell-module attenuation model according to the first capacity attenuation and the second capacity attenuation.

[0014] Optionally, the control of the temperature difference between the cells of the test battery module comprises:

[0015] performing a specified number of charge-discharge cycles on the test battery module, and recording the maximum temperature of the cells of the test battery module;

[0016] controlling the temperature difference between the first cell and the second cell of the test battery module to be at least greater than the maximum temperature.

[0017] Optionally, when different cycle tests are performed, the temperature difference between the first cell and the second cell is controlled to be changed, and the temperature difference between the first cell and the second cell is at least greater than the maximum temperature.

[0018] Optionally, the working condition parameters include one or more of a charge-discharge current, a charge-discharge depth, and an ambient temperature.

[0019] Optionally, after determining the maximum temperature difference between the cells of the battery module, the method further comprises:

[0020] if the maximum temperature difference exceeds a temperature difference threshold, controlling the battery module to be cooled.

[0021] Optionally, the control of the battery module to be cooled comprises:

[0022] changing one or more of a heating power of a heating film, a heating time, adjusting a cooling liquid temperature of a liquid cooling system, and a flow rate.

[0023] In a second aspect, an embodiment of the present application further provides a battery module life determination device, comprising a battery module life determination unit, the battery module life determination unit is used for:

[0024] determining a maximum temperature difference between cells of a battery module, and determining a cell attenuation coefficient according to the maximum temperature difference;

[0025] obtaining working condition parameters of the battery module, and determining a capacity attenuation of the battery module according to the working condition parameters;

[0026] determining a life of the battery module according to the cell attenuation coefficient and the capacity attenuation.

[0027] In a third aspect, an embodiment of the present application further provides an electronic device, comprising at least one processor, and a memory in communication connection with the at least one processor;

[0028] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the battery module life determination method recorded in the embodiments of the application.

[0029] In a fourth aspect, the embodiments of the application further provide a computer readable storage medium, which stores computer instructions for enabling a processor to implement the battery module life determination method recorded in the embodiments of the application when the processor executes the computer instructions.

[0030] Compared with the prior art, the application has the beneficial effects that: the application provides a battery module life determination method, in which the maximum temperature difference between the battery cells of the battery module is determined, the battery cell attenuation coefficient is determined according to the maximum temperature difference, the working condition parameters of the battery module are obtained, the capacity attenuation of the battery module is determined according to the working condition parameters, and the life of the battery module is determined according to the battery cell attenuation coefficient and the capacity attenuation. In the method, the battery cell attenuation coefficient is determined through the maximum temperature difference between the battery cells, and the life of the battery module is further determined according to the battery cell attenuation coefficient and the capacity attenuation. The life of the battery module is associated with the temperature difference between the battery cells in the battery module, and the accuracy of the life prediction of the battery module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a battery module life determination method flowchart in the embodiments;

[0032] Figure 2 is a battery cell-module attenuation model determination flowchart in the embodiments;

[0033] Figure 3 is a battery module schematic diagram in the embodiments;

[0034] Figure 4 is a capacity attenuation curve schematic diagram in the embodiments;

[0035] Figure 5 is a battery cell-module attenuation model curve schematic diagram in the embodiments;

[0036] Figure 6 is another battery module life determination method flowchart in the embodiments;

[0037] Figure 7 is an electronic device structure schematic diagram in the embodiments. DETAILED DESCRIPTION

[0038] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not to be used to limit the scope of the application. In addition, it should be noted that, for the sake of brevity, only the parts of the drawings that are related to the application are shown.

[0039] Embodiment One

[0040] Figure 1 is a flowchart of the battery module life determination method in the embodiment, referring to Figure 1 The battery module life determination method comprises:

[0041] S101. Determine the maximum temperature difference between the battery cells in the battery module, and determine the battery cell attenuation coefficient according to the maximum temperature difference.

[0042] For example, in the embodiment, the temperature of each battery cell in the battery module is obtained during use of the battery module, the temperature difference between the battery cells is determined according to the temperature of the battery cells, and the maximum temperature difference between the battery cells is determined.

[0043] For example, in the embodiment, the battery cell attenuation coefficient is a pre-stored value, and the battery cell attenuation coefficient is determined according to the corresponding relationship between the maximum temperature difference and the battery cell attenuation coefficient after the maximum temperature difference is determined.

[0044] For example, in the embodiment, the corresponding relationship between the maximum temperature difference and the battery cell attenuation coefficient is determined by calibration test.

[0045] For example, in the embodiment, the determination method of the battery cell attenuation coefficient is not specifically limited, for example, the battery cell attenuation coefficient can be determined by experience or calibration test.

[0046] S102. Obtain the working condition parameters of the battery module, and determine the capacity attenuation of the battery module according to the working condition parameters.

[0047] For example, in the embodiment, the working condition parameters of the battery module can be determined according to the battery management system (BMS) configured by the battery module, that is, the working condition parameters can be one or more of the parameters collected (monitored) by the BMS configuration.

[0048] For example, in the embodiment, the working condition parameters can specifically include one or more of the charging and discharging current, the charging and discharging depth, and the ambient temperature.

[0049] For example, in the embodiment, the method of determining the capacity attenuation of the battery module by the working condition parameters is not limited, and any capacity attenuation determination method in the prior art can be used to determine the capacity attenuation of the battery module.

[0050] S103. Determine the life of the battery module according to the cell attenuation coefficient and the capacity attenuation.

[0051] For example, in the embodiment, the life of the battery module can be determined according to the following formula:

[0052]

[0053] In the above formula, Q module represents the life of the battery module, represents the cell attenuation coefficient, Q cell represents the capacity attenuation.

[0054] The embodiment of the application provides a battery module life determination method, in which the maximum temperature difference between cells of the battery module is determined, the cell attenuation coefficient is determined according to the maximum temperature difference, the working condition parameters of the battery module are obtained, the capacity attenuation of the battery module is determined according to the working condition parameters, and the life of the battery module is determined according to the cell attenuation coefficient and the capacity attenuation. In the method, the cell attenuation coefficient is determined through the maximum temperature difference between cells, and the life of the battery module is further determined according to the cell attenuation coefficient and the capacity attenuation. The life of the battery module is associated with the temperature difference between cells in the battery module, and the accuracy of the life prediction of the battery module is improved.

[0055] In Figure 1 the above-mentioned scheme, in an implementable scheme, the cell attenuation coefficient is determined by using a cell-module attenuation model according to the maximum temperature difference.

[0056] For example, in the scheme, the cell attenuation coefficient is determined by using a cell-module attenuation model, Figure 2 is a flow chart for determining the cell-module attenuation model in the embodiment, and reference is made to Figure 2 to determine the cell-module attenuation model, which includes:

[0057] S1. Control the cell temperature difference of the test group battery module. Except for the cell temperature difference, the same cycle test conditions are used to perform cycle tests on the test group battery module and the control group battery module.

[0058] For example, in the scheme, the test group battery module and the control group battery module are set, and the test group battery module and the control group battery module are the same in terms of various physical parameters (for example, the number of cells, the rated charge and discharge current, the service life, etc.).

[0059] For example, in the scheme, the test group battery module and the control group battery module are simultaneously subjected to cycle tests under the same cycle test conditions. When the cycle tests are performed, the difference between the test group battery module and the control group battery module lies in that, in addition to the predetermined cycle test conditions, the cell temperature difference of the test group battery module is actively controlled.

[0060] Exemplarily, in the present solution, the cycle test conditions and corresponding steps when performing the cycle test are not specifically limited, for example, the test process can be completed according to any one of the cycle life test, charge-discharge test, SOC test in the prior art.

[0061] Exemplarily, in the present solution, when performing a cycle test, the temperature difference of the battery cell is controlled to be constant, and when performing cycle tests of different rounds, the temperature difference of the battery cell is controlled to change.

[0062] Exemplarily, in the present solution, the way of controlling the temperature difference of the battery cell of the test group battery module is not specifically limited, Figure 3 is a schematic diagram of the battery module in the embodiment, referring to Figure 3 The active control of the temperature difference of the battery cell can be realized in the following way.

[0063] Referring to Figure 3 , the battery module includes battery cells T1-T12, and first end plates 111 and 112 are respectively arranged at two ends of the battery module, a first heating film 211 is arranged at the first end plate 111, a second heating film 212 is arranged at the first end plate 112, and a thermocouple (not shown in the figure) is arranged at each of the battery cells T1-T12.

[0064] Exemplarily, in the present solution, the temperature difference between the battery cell T1 and the battery cell T12 is set as the temperature difference of the battery cell, the first heating film 211 is set to heat the battery cell T1, and the second heating film 212 is set to heat the battery cell T12.

[0065] Exemplarily, in the present solution, the first heating film 211 and the second heating film 212 are respectively connected with a programmable power supply, the current output to the first heating film 211 and / or the second heating film 212 is adjusted by the programmable power supply to realize the power adjustment of the heating film, and then the temperature difference between the battery cell T1 and the battery cell T12 is controlled to be the set temperature difference of the battery cell.

[0066] S2. Obtain the capacity attenuation of the test group battery module, denoted as the first capacity attenuation, and obtain the capacity attenuation of the control group battery module, denoted as the second capacity attenuation.

[0067] Exemplarily, in the present solution, the cycle test can be performed for multiple rounds, and the capacity attenuation of the test group battery module after completing a round of cycle test is recorded as the first capacity attenuation (i.e., multiple first capacity attenuations are recorded after multiple rounds of cycle test), and the capacity attenuation of the control group battery module after a round of cycle test is selected and recorded as the second capacity attenuation.

[0068] S3. Determine the battery cell-module attenuation model according to the first capacity attenuation and the second capacity attenuation.

[0069] In the scheme, a plurality of rounds of cycle tests are set, and one round of cycle tests corresponds to one cell temperature difference.

[0070] Figure 4 is a schematic diagram of capacity attenuation curves in the embodiment, refer to Figure 4 , Figure 4 In the scheme shown in

[0071] For example, in the scheme, taking the second capacity attenuation as a reference, the cell attenuation coefficients corresponding to the remaining first capacity attenuations can be determined, and then a cell-module attenuation model is formed.

[0072] Figure 5 is a schematic diagram of a cell-module attenuation model curve in the embodiment, refer to Figure 5 , for example, after a plurality of rounds of cycle tests, a cell-module attenuation model as shown in Figure 5 can be obtained, wherein the cell-module attenuation model can be represented by the following formula:

[0073]

[0074] In the above formula, represents the cell attenuation coefficient, and ΔT represents the cell temperature difference.

[0075] For example, in the scheme, when the cell temperature difference is determined, the cell temperature difference can be brought into the cell-module attenuation model to determine the corresponding cell attenuation coefficient.

[0076] As an implementable scheme, on the basis of the scheme shown in Figure 2 , the control of the cell temperature difference of the test group battery module includes:

[0077] The test group battery module is subjected to a specified number of charge-discharge cycles, and the maximum temperature of the cell of the test group battery module is recorded.

[0078] The cell temperature difference between the first cell and the second cell of the test group battery module is controlled to be at least greater than the maximum temperature.

[0079] For example, in the scheme, before the cycle test is performed, the range of the cell temperature difference when the cell temperature difference control is implemented is first determined.

[0080] For example, in the present solution, the temperature difference between the first and second battery cells of the test battery module is controlled to be greater than the maximum temperature during the cycle test.

[0081] After the cycle test, the maximum temperature of the battery cells of the test battery module is recorded.

[0082] For example, in the present solution, the cycle test can be performed according to any of the existing charging and discharging test processes.

[0083] For example, in the present solution, the temperature difference between the first and second battery cells of the test battery module is controlled to be greater than the maximum temperature during the cycle test.

[0084] For example, if the maximum temperature is set to TAXmax, the temperature difference between the first and second battery cells is controlled to be greater than or equal to TAXmax during the cycle test. Figure 3

[0085] For example, in the present solution, when performing multiple rounds of cycle tests, the temperature difference between the first and second battery cells is changed when switching to the next round of cycle test, and the temperature difference is controlled to be greater than the maximum temperature.

[0086] For example, in combination with Figure 3 In the present solution, the control of the temperature difference between the battery cells can be achieved by the following methods:

[0087] The test battery module is subjected to X (X≤5) times of charging and discharging cycles, and the temperature data of the battery cells T1-T12 is recorded, the maximum value is TAXmax, the minimum value is TAXmin, and the temperature difference is TAX.

[0088] The temperature difference between the battery cells T1 and T12 (battery cell temperature difference) is set to a constant value T1, and the battery cell temperature difference T1≤TAX+TsetA1-TAXmax is set.

[0089] During the cycle test, the heating control function is turned on, and the current and / or voltage of the first and second heating films 211 and 212 are adjusted according to the detected temperature of the battery cells T1 and T12.

[0090] When the temperature difference between the battery cells T1 and T12 is too low, the current of the first and second heating films 211 and 212 is increased; when the temperature difference between the battery cells T1 and T12 is too high, the current of the first and second heating films 211 and 212 is decreased, so that the battery cell temperature difference T1 is stabilized within the set range.

[0091] The capacity attenuation data during the cycle test is recorded.

[0092] ​When performing the next round of cycle test, the temperature difference between the battery cells T1 and T12 (battery cell temperature difference) is set as a constant value T2, and the capacity attenuation data at this cycle test is recorded;

[0093] The cycle test is repeated until the specified number of rounds of cycle test is completed and a sufficient amount of capacity attenuation data is recorded.

[0094] Figure 6 is another battery module life determination method flowchart in the embodiment, referring to Figure 6 , on the basis of the scheme shown in Figure 1 As an implementable scheme, the battery module life determination method can also be:

[0095] S101. Determine the maximum temperature difference between the battery cells of the battery module, and determine the battery cell attenuation coefficient according to the maximum temperature difference.

[0096] S102. Obtain the working condition parameters of the battery module, and determine the capacity attenuation of the battery module according to the working condition parameters.

[0097] S103. Determine the life of the battery module according to the battery cell attenuation coefficient and the capacity attenuation.

[0098] For example, in this scheme, the implementation mode of steps S101-S103 is the same as the corresponding content recorded in Figure 1 .

[0099] S104. If the maximum temperature difference exceeds the temperature difference threshold, control the battery module to cool down.

[0100] For example, if the temperature difference between the battery cells is too large, it may cause the life of the battery module to not meet the warranty requirements. In this scheme, if it is determined that the maximum temperature difference between the battery cells exceeds the temperature difference threshold, the battery module is actively controlled to cool down.

[0101] For example, in this scheme, the temperature difference threshold can be an empirical value or determined through calibration test.

[0102] For example, in this scheme, the active cooling control of the battery module can be: adjusting the cooling liquid temperature and / or flow rate of the liquid cooling system (configured for the battery module); if the battery module is configured with a heating film, the active cooling control can also be changing the heating power and / or heating time of the heating film.

[0103] In this embodiment, any of the battery module life determination methods described above can be freely arranged and combined, for example, in an implementable scheme, Figure 6 The scheme shown in can be specifically implemented in the following manner:

[0104] S101. Determine the maximum temperature difference between the battery cells of the battery module, and determine the battery cell attenuation coefficient according to the maximum temperature difference.

[0105] In an example, after determining the maximum temperature difference, a cell-module attenuation model is used to determine the cell attenuation coefficient.

[0106] In the present solution, the cell-module attenuation model includes:

[0107] S1. Control the cell temperature difference of the test group battery module. In addition to the cell temperature difference, the same cycle test conditions are used to perform cycle tests on the test group battery module and the control group battery module.

[0108] In an example, the test group battery module and the control group battery module are set, and the test group battery module and the control group battery module have the same physical parameters (such as the number of cells, the rated charge and discharge current, the service life, etc.).

[0109] In an example, when performing a cycle test, the cell temperature difference is controlled to be constant, and when performing different rounds of cycle tests, the cell temperature difference is changed.

[0110] In an example, the active control of the cell temperature difference can be achieved in the following manner.

[0111] The test group battery module is subjected to a specified number of charge and discharge cycles, and the maximum temperature of the cells of the test group battery module is recorded.

[0112] The cell temperature difference between the first cell and the second cell of the test group battery module is controlled to be at least greater than the maximum temperature.

[0113] In an example, the control of the cell temperature difference can be achieved in the following manner. Figure 3 In an example, the control of the cell temperature difference can be achieved in the following manner.

[0114] The test group battery module is subjected to X (X≤5) charge and discharge cycles, and the temperature data of the cells T1-T12 is recorded, the maximum value thereof is TAXmax, the minimum value thereof is TAXmin, and the temperature difference is TAX.

[0115] The cell temperature difference (cell temperature difference) between the cells T1 and T12 is set to a constant value T1, and the cell temperature difference T1≤TAX+TsetA1-TAXmax is specifically set.

[0116] The cycle test is performed, and the heating regulation function is started at the same time. The current and / or voltage of the first heating film 211 and the second heating film 212 are adjusted according to the detected temperatures of the cells T1 and T12.

[0117] When the temperature difference between the battery cells T1 and T12 is too low, the current of the first heating film 211 and the second heating film 212 is increased; when the temperature difference between the battery cells T1 and T12 is too high, the current of the first heating film 211 and the second heating film 212 is reduced, so that the temperature difference T1 of the battery cell is stabilized within a set range.

[0118] Record the capacity attenuation data during the cycle test;

[0119] During the next round of cycle test, the temperature difference (temperature difference of battery cell) between the battery cells T1 and T12 is set to a constant value T2, and the capacity attenuation data during the cycle test is recorded.

[0120] Repeat the cycle test until the specified number of cycles of cycle test is completed and a sufficient amount of capacity attenuation data is recorded.

[0121] S2. Obtain the capacity attenuation of the test group battery module, denoted as the first capacity attenuation, and obtain the capacity attenuation of the control group battery module, denoted as the second capacity attenuation.

[0122] For example, in this scheme, the cycle test can be performed for multiple rounds, and after completing a round of cycle test, the capacity attenuation of the test group battery module is recorded as the first capacity attenuation (i.e., after multiple rounds of cycle test, multiple first capacity attenuations are recorded), and the capacity attenuation of the control group battery module after a round of cycle test is selected as the second capacity attenuation.

[0123] S3. Determine the battery cell-module attenuation model according to the first capacity attenuation and the second capacity attenuation.

[0124] In this scheme, a plurality of rounds of cycle test are set, and the first round of cycle test corresponds to a battery cell temperature difference.

[0125] For example, in this scheme, the second capacity attenuation is taken as a reference, and the battery cell attenuation coefficients corresponding to the remaining first capacity attenuations can be determined, and then the battery cell-module attenuation model is formed.

[0126] For example, after multiple rounds of cycle test, the battery cell-module attenuation model as shown in Figure 5 may be obtained, wherein the battery cell-module attenuation model can be represented by the following formula:

[0127]

[0128] In the above formula, represents the battery cell attenuation coefficient, and ΔT represents the temperature difference of the battery cell.

[0129] For example, in this scheme, when the battery cell temperature difference (maximum temperature difference) is determined, the battery cell temperature difference can be brought into the battery cell-module attenuation model, and then the corresponding battery cell attenuation coefficient is determined.

[0130] S102. Obtain the working condition parameters of the battery module, and determine the capacity attenuation of the battery module according to the working condition parameters.

[0131] For example, in this scheme, the working condition parameters specifically include the charge and discharge current, the charge and discharge depth, and the ambient temperature.

[0132] S103. Determine the life of the battery module according to the cell attenuation coefficient and the capacity attenuation.

[0133] For example, in this scheme, the life of the battery module can be determined according to the following formula:

[0134]

[0135] In the above formula, Q module represents the life of the battery module, represents the cell attenuation coefficient, and Q cell represents the capacity attenuation.

[0136] S104. If the maximum temperature difference exceeds the temperature difference threshold, control the battery module to cool down.

[0137] For example, in this scheme, the active cooling control of the battery module can be adjusting the cooling liquid temperature and / or flow rate of the liquid cooling system (configured for the battery module).

[0138] Embodiment two

[0139] This embodiment proposes a battery module life determination device, which comprises a battery module life determination unit, and the battery module life determination unit is used to:

[0140] determine the maximum temperature difference between the cells of the battery module, and determine the cell attenuation coefficient according to the maximum temperature difference;

[0141] obtain the working condition parameters of the battery module, and determine the capacity attenuation of the battery module according to the working condition parameters;

[0142] determine the life of the battery module according to the cell attenuation coefficient and the capacity attenuation.

[0143] For example, in this embodiment, the battery module life determination unit can be specifically configured to implement any one of the battery module life determination methods described in the embodiments, and the implementation process and beneficial effects are the same as the corresponding contents described in Embodiment One, which will not be repeated here.

[0144] Embodiment three

[0145] Figure 7A structural diagram of an electronic device 10 that can be used to implement embodiments of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smartphones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the present application described and / or claimed in this document.

[0146] As shown, the electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., communicatively connected to the at least one processor 11, where the memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer programs stored in the read-only memory (ROM) 12 or loaded into the random access memory (RAM) 13 from the storage unit 18. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14. Figure 7

[0147] Various components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc., an output unit 17, such as various types of displays, speakers, etc., a storage unit 18, such as a magnetic disk, an optical disk, etc., and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0148] The processor 11 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the battery module life determination method.

[0149] ​In some embodiments, the battery module life determination method can be implemented as a computer program tangibly embodied in a computer readable storage medium, e.g., storage unit 18. In some embodiments, parts or all of the computer program can be loaded and / or installed onto electronic device 10 via, e.g., ROM 12 and / or communication unit 19. When the computer program is loaded onto RAM 13 and executed by processor 11, one or more steps of the above-described battery module life determination method can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the battery module life determination method by other any suitable means, e.g., by way of firmware.

[0150] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, specially designed application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0151] Computer programs used to implement the methods of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program, when executed by the processor of the machine, implements the functions / acts specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0152] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0153] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0154] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0155] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business expansion in traditional physical host and VPS service.

[0156] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A method for determining the lifespan of a battery module, characterized in that, The method comprises: determining the maximum temperature difference between the cells of the battery module, determining the cell attenuation coefficient of the battery module according to the maximum temperature difference; obtaining the working condition parameters of the battery module, and determining the capacity attenuation of the battery module according to the working condition parameters; determining the service life of the battery module according to the cell attenuation coefficient and the capacity attenuation of the battery module; determining the cell-module attenuation model according to the maximum temperature difference and the cell-module attenuation model; determining the cell-module attenuation model comprises: controlling the cell temperature difference of the test group battery module, and performing cycle tests on the test group battery module and the control group battery module under the same cycle test conditions except for the cell temperature difference; obtaining the capacity attenuation of the test group battery module, denoted as the first capacity attenuation, and obtaining the capacity attenuation of the control group battery module, denoted as the second capacity attenuation; determining the cell-module attenuation model according to the first capacity attenuation and the second capacity attenuation, and determining the cell attenuation coefficient of the target battery module according to the cell-module attenuation model; wherein after multiple rounds of cycle tests, multiple first capacity attenuations are recorded, one round of cycle test corresponds to one cell temperature difference, and different rounds of cycle tests correspond to different cell temperature differences; controlling the cell temperature difference between the first cell and the second cell of the test group battery module to be greater than the maximum temperature of the cells of the test group battery module; wherein the difference between the test group battery module and the control group battery module during the cycle test is that the cell temperature difference of the test group battery module is actively controlled in addition to the predetermined cycle test conditions.

2. The battery module life determination method of claim 1, wherein, controlling the cell temperature difference of the test group battery module comprises: performing a specified number of charge and discharge cycles on the test group battery module, and recording the maximum temperature of the cells of the test group battery module.

3. The battery module life determination method of claim 2, wherein, During different cycle tests, the cell temperature difference between the first cell and the second cell is controlled to change, and the cell temperature difference is greater than the maximum temperature.

4. The method of claim 1 to 3, wherein The working condition parameters include one or more of the charging and discharging current, the charging and discharging depth, and the environmental temperature.

5. The method of claim 1 to 3, wherein After determining the maximum temperature difference between the cells of the battery module, the method further comprises: if the maximum temperature difference exceeds a temperature difference threshold, controlling the battery module to cool down.

6. The battery module life determination method of claim 5, wherein, controlling the battery module to cool down comprises: changing one or more of the heating power of the heating film, the heating time, adjusting the cooling liquid temperature of the liquid cooling system, and the flow rate.

7. A battery module life determination apparatus, characterized by comprising: The method comprises: determining the maximum temperature difference between the cells of the battery module, determining the cell attenuation coefficient of the battery module according to the maximum temperature difference; obtaining the working condition parameters of the battery module, and determining the capacity attenuation of the battery module according to the working condition parameters; determining the service life of the battery module according to the cell attenuation coefficient and the capacity attenuation; determining the cell-module attenuation model according to the maximum temperature difference and the cell-module attenuation model; determining the cell-module attenuation model comprises: controlling the cell temperature difference of the test group battery module, and performing cycle tests on the test group battery module and the control group battery module under the same cycle test conditions except for the cell temperature difference; Obtain a capacity attenuation of the test group battery module, denoted as a first capacity attenuation, and obtain a capacity attenuation of the control group battery module, denoted as a second capacity attenuation; Determine the cell-module attenuation model according to the first capacity attenuation and the second capacity attenuation, and determine a cell attenuation coefficient of the target battery module according to the cell-module attenuation model; After a plurality of rounds of cycle tests, a plurality of the first capacity attenuations are recorded, one round of cycle test corresponds to one cell temperature difference, and different rounds of cycle tests correspond to different cell temperature differences; The cell temperature difference between the first cell and the second cell of the test group battery module is controlled to be at least greater than the maximum temperature of the cells of the test group battery module; When the cycle test is performed, the test group battery module and the control group battery module differ in that, in addition to the predetermined cycle test condition, the cell temperature difference of the test group battery module is actively controlled.

8. An electronic device, comprising: The device comprises at least one processor and a memory connected in communication with the at least one processor; The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the battery module life determination method in any one of claims 1-6.

9. A computer readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for enabling the processor to execute the battery module life determination method in any one of claims 1-6 when executed by the processor.

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