Lithium battery aging detection method, system, device and storage medium

Abstract

The present application relates to the technical field of battery detection, and discloses a lithium battery aging detection method, system, device and storage medium. The method comprises identifying a target model corresponding to a target lithium battery, and obtaining corresponding temperature characteristic experimental data based on the target model; when it is detected that the target lithium battery enters a charging state, obtaining the charging temperature, charging power difference and charging energy of the target lithium battery during charging; based on the charging temperature, obtaining the corresponding initial available capacity from the temperature characteristic experimental data, and calculating the charging aging capacity parameter based on the charging power difference, charging energy and initial available capacity; based on the latest charging aging capacity parameter, updating the aging detection result and sending it to the aging detection display unit; the present application has the effect of reducing the impact of aging detection on the normal use of lithium batteries.

Description

Technical Field

[0001] The present application relates to the technical field of battery detection, and in particular to a lithium battery aging detection method, system, device and storage medium. Background Art

[0002] During the use of lithium batteries, due to chemical reaction imbalance, electrolyte loss, changes in electrode material structure, internal short circuit of the battery and other reasons, the performance indicators such as battery capacity, voltage, and cycle life may gradually decline; currently, the detection methods for lithium battery aging include cyclic charge and discharge test methods. The cyclic charge and discharge test method requires the determination of the test environment. The lithium battery must be charged and discharged several times in a specific environment to determine the capacity decay of the lithium battery. Therefore, a more stringent test environment and a longer test time are required during the test process; however, in some lithium battery application scenarios, such as the lithium battery equipped with a small-capacity plug-in hybrid new energy vehicle, the owner may not charge it regularly, but replenish it by adding fuel for a long time, so the lithium battery cannot be regularly tested for capacity decay. Therefore, the above-mentioned related technologies have the problem of difficulty in performing aging detection while the lithium battery is in normal use. Summary of the invention

[0003] In order to reduce the impact of aging detection on the normal use of lithium batteries, the present application provides a lithium battery aging detection method, system, device and storage medium.

[0004] The first invention objective of this application is achieved by adopting the following technical solution:

[0005] Lithium battery aging detection method, including:

[0006] Identify the target model corresponding to the target lithium battery, and obtain the corresponding temperature characteristic experimental data based on the target model;

[0007] When it is detected that the target lithium battery enters a charging state, the charging temperature, charging power difference and charging energy of the target lithium battery during charging are obtained;

[0008] Based on the charging temperature, obtaining the corresponding initial available capacity from the temperature characteristic experimental data, and calculating the charging aging capacity parameter based on the charging power difference, the charging energy and the initial available capacity;

[0009] Based on the latest charging aging capacity parameter, the aging detection result is updated and sent to the aging detection display unit;

[0010] The formula for the charging aging capacity parameter is:

[0011]

[0012] Among them, R1 is the charging aging capacity parameter, E1 is the charging energy, ΔSOC + is the charge capacity difference, SOC0 is the initial available capacity; the temperature characteristic experimental data includes data on the initial available capacity of the target model lithium battery at different temperatures.

[0013] By adopting the above technical solution, the target model corresponding to the target lithium battery to be monitored is determined to obtain the temperature characteristic experimental data of the target model lithium battery, so as to facilitate the acquisition of the initial available capacity of the target lithium battery at different temperatures; since it is difficult for lithium batteries to meet the aging detection conditions through regular cycle charge and discharge tests in specific scenarios, therefore, when it is detected that the target lithium battery enters the charging state, the data of the charging temperature, charging power difference, and charging energy of the target lithium battery during the charging period are obtained, so as to facilitate the subsequent calculation of the available capacity of the current target lithium battery from the influence of the charging energy on the charging power difference during this charging process; based on the charging temperature, the initial available capacity at the corresponding temperature is obtained from the temperature characteristic experimental data to obtain the theoretical available capacity of the target lithium battery in the factory state, and the charging aging capacity parameter is calculated according to the charging power difference, the charging energy and the initial available capacity to obtain the aging of the current target lithium battery; based on the latest charging aging capacity parameter, the aging detection result is updated and sent to the aging detection display unit, so that the user can know the aging of the current target lithium battery, thereby reducing the impact of aging detection on the normal use of the lithium battery.

[0014] In a preferred example of the present application, when it is detected that the target lithium battery is in a charging state, obtaining the charging temperature, charging power difference and charging energy of the target lithium battery during charging includes:

[0015] When it is detected that the target lithium battery enters the charging state, the charging start time and the charging start power are determined, and the battery temperature of the target lithium battery is detected based on a preset temperature sampling period to generate temperature time information;

[0016] When the target lithium battery is detected to be in a charging state, the charging end time and charging end power are determined;

[0017] The average temperature during charging is calculated based on the temperature-time information and defined as the charging temperature. The difference between the charge end power and the charge start power is calculated and defined as the charging power difference. The input power of the target lithium battery during charging is obtained to determine the charging energy.

[0018] By adopting the above technical scheme, when it is detected that the target lithium battery enters the charging state, the charging start time and the charging start power are determined, and the battery temperature of the target lithium battery is detected according to the preset temperature sampling period and the temperature time information is generated, so as to analyze the temperature change of the target lithium battery over time; when it is detected that the target lithium battery ends the charging state, the charging end time and the charging end power are determined to facilitate the subsequent analysis of the power obtained by this charging; the average temperature during this charging period is calculated as the charging temperature according to the temperature time information, and the difference between the charging end power and the charging start power is calculated to obtain the charging power difference, so as to determine the proportion of the power obtained by this charging to the current total available power, and the electric energy input during the charging period is obtained to determine the electric energy obtained by the target lithium battery through this charging.

[0019] In a preferred example of the present application: the charging aging capacity parameters are all marked with time information;

[0020] The updating of the aging detection result based on the latest charging aging capacity parameter and sending the result to the aging detection display unit includes:

[0021] Obtain all charging aging capacity parameters within the latest preset evaluation period, and calculate the corresponding average charging aging capacity parameters;

[0022] Calculate the charging aging capacity display parameters based on the average charging aging capacity parameters and the duration of the evaluation period;

[0023] Update the aging detection result based on the charging aging capacity display parameter and send it to the aging detection display unit;

[0024] Among them, the calculation formula of the charging aging capacity display parameter is:

[0025]

[0026] Among them, R 1D It is the charging aging capacity display parameter. is the average parameter of charging aging capacity, T is the length of the evaluation period, and k is the aging coefficient of the evaluation period.

[0027] By adopting the above technical solution, the charging aging capacity parameter is marked with time information, which is convenient for subsequent screening of data for updating the aging detection result from a large number of charging aging capacity parameters, and obtaining all charging aging capacity parameters whose time information falls within the latest evaluation period to calculate the corresponding charging aging capacity average parameter; the charging aging capacity display parameter is calculated according to the charging aging capacity average parameter and the duration of the evaluation period, wherein the difference between the charging aging capacity display parameter and the charging aging capacity average parameter is positively correlated with the duration of the evaluation period, so as to compensate for the aging of the target lithium battery during the evaluation period; the aging detection result is updated based on the charging aging capacity display parameter and sent to the aging detection display unit, so that the user can know the charging aging status of the current target lithium battery.

[0028] In a preferred example of the present application, after identifying the target model corresponding to the target lithium battery and obtaining the corresponding temperature characteristic experimental data based on the target model, the method further includes:

[0029] When it is detected that the target lithium battery enters a discharge state, the discharge temperature, discharge power difference and discharge energy of the target lithium battery during the discharge period are obtained;

[0030] Based on the discharge temperature, obtaining the corresponding initial available capacity from the temperature characteristic experimental data, and calculating the discharge aging capacity parameter based on the discharge power difference, the discharge energy and the initial available capacity;

[0031] The formula for the discharge aging capacity parameter is:

[0032]

[0033] Among them, R2 is the discharge aging capacity parameter, E2 is the discharge energy, ΔSOC - is the discharge capacity difference, and SOC0 is the initial available capacity.

[0034] By adopting the above technical solution, since it is difficult for lithium batteries to meet the aging detection conditions through regular cyclic charge and discharge tests in specific scenarios, when it is detected that the target lithium battery enters the discharge state, the data of the discharge temperature, discharge power difference, and discharge energy of the target lithium battery during the discharge period are obtained, so as to facilitate the subsequent calculation of the available capacity of the current target lithium battery from the influence of the discharge energy on the discharge power difference during this discharge process; based on the discharge temperature, the initial available capacity at the corresponding temperature is obtained from the temperature characteristic experimental data to obtain the theoretical available capacity of the target lithium battery in the factory state, and the discharge aging capacity parameter is calculated according to the discharge power difference, discharge energy and initial available capacity to obtain the aging condition of the current target lithium battery.

[0035] In a preferred example of the present application: the aging detection result also includes a discharge aging capacity display parameter; the charging aging capacity parameters are all marked with time information;

[0036] After obtaining the corresponding initial available capacity from the temperature characteristic experimental data based on the discharge temperature, and calculating the discharge aging capacity parameter based on the discharge power difference, the discharge energy and the initial available capacity, the method further includes:

[0037] Obtain all discharge aging capacity parameters within the latest preset evaluation period, and calculate the corresponding average discharge aging capacity parameters;

[0038] Calculate the discharge aging capacity display parameters based on the average discharge aging capacity parameters and the duration of the evaluation period;

[0039] Update aging test results based on discharge aging capacity display parameters;

[0040] Among them, the calculation formula of the discharge aging capacity display parameter is:

[0041]

[0042] Among them, R 2D It is the discharge aging capacity display parameter. is the average parameter of discharge aging capacity, T is the length of the evaluation period, and k is the aging coefficient of the evaluation period.

[0043] By adopting the above technical solution, the discharge aging capacity parameter is marked with time information, which is convenient for subsequent screening of data for updating the aging detection results from a large number of discharge aging capacity parameters, and obtaining all discharge aging capacity parameters whose time information falls within the latest evaluation period to calculate the corresponding discharge aging capacity average parameter; the discharge aging capacity display parameter is calculated according to the discharge aging capacity average parameter and the duration of the evaluation period, wherein the difference between the discharge aging capacity display parameter and the discharge aging capacity average parameter is positively correlated with the duration of the evaluation period, so as to compensate for the aging of the target lithium battery during the evaluation period; the aging detection results are updated based on the discharge aging capacity display parameter, so that the user can comprehensively know the charging aging and discharge aging conditions of the current target lithium battery.

[0044] The second invention objective of this application is achieved by the following technical solution:

[0045] A lithium battery aging detection system, applied to any of the above-mentioned lithium battery aging detection methods, comprises:

[0046] A temperature characteristic experimental data acquisition module is used to identify the target model corresponding to the target lithium battery and acquire the corresponding temperature characteristic experimental data based on the target model;

[0047] A charging state parameter acquisition module is used to acquire the charging temperature, charging power difference and charging energy of the target lithium battery during charging when it is detected that the target lithium battery enters the charging state;

[0048] a charging aging capacity parameter calculation module, configured to obtain the corresponding initial available capacity from the temperature characteristic experimental data based on the charging temperature, and calculate the charging aging capacity parameter based on the charging power difference, the charging energy and the initial available capacity;

[0049] An aging detection result display module, used to update the aging detection result based on the latest charging aging capacity parameter and send it to the aging detection display unit;

[0050] The formula for the charging aging capacity parameter is:

[0051]

[0052] Among them, R1 is the charging aging capacity parameter, E1 is the charging energy, ΔSOC + is the charge capacity difference, SOC0 is the initial available capacity; the temperature characteristic experimental data includes data on the initial available capacity of the target model lithium battery at different temperatures.

[0053] In a preferred example of the present application: the charging state parameter acquisition module includes:

[0054] Enter the charging state analysis submodule, which is used to determine the charging start time and charging start power when detecting that the target lithium battery enters the charging state, and detect the battery temperature of the target lithium battery based on a preset temperature sampling period to generate temperature time information;

[0055] The end-of-charge state analysis submodule is used to determine the end-of-charge time and end-of-charge power when detecting that the target lithium battery has ended its charge state;

[0056] The charging analysis submodule is used to calculate the average temperature during charging based on the temperature-time information and define it as the charging temperature, calculate the difference between the charge end power and the charge start power and define it as the charging power difference, and obtain the input power of the target lithium battery during charging to determine the charging energy.

[0057] In a preferred example of the present application: the aging detection result display module includes:

[0058] The charging aging capacity average parameter calculation submodule is used to obtain all charging aging capacity parameters within the latest preset evaluation period and calculate the corresponding charging aging capacity average parameter;

[0059] A charging aging capacity display parameter calculation submodule is used to calculate the charging aging capacity display parameter based on the charging aging capacity average parameter and the duration of the evaluation period;

[0060] A charging aging detection result updating submodule, used to update the aging detection result based on the charging aging capacity display parameter and send it to the aging detection display unit;

[0061] Among them, the calculation formula of the charging aging capacity display parameter is:

[0062]

[0063] Among them, R 1D It is the charging aging capacity display parameter. is the average parameter of charging aging capacity, T is the duration of the evaluation period, k is the time efficiency coefficient of the evaluation period, and the charging aging capacity parameters are all marked with time information.

[0064] The third invention objective of this application is achieved by the following technical solution:

[0065] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned lithium battery aging detection method when executing the computer program.

[0066] The fourth invention objective of this application is achieved by the following technical solution:

[0067] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned lithium battery aging detection method.

[0068] In summary, the present application includes at least one of the following beneficial technical effects:

[0069] 1. Determine the target model corresponding to the target lithium battery to be monitored, so as to obtain the temperature characteristic experimental data of the target model lithium battery, so as to obtain the initial available capacity of the target lithium battery at different temperatures; during the normal use of the target lithium battery, when it is detected that the target lithium battery enters the charging state, obtain the data of the charging temperature, charging power difference and charging energy of the target lithium battery during the charging period, so as to calculate the available capacity of the current target lithium battery from the influence of the charging energy on the charging power difference in this charging process; based on the charging temperature, obtain the initial available capacity at the corresponding temperature from the temperature characteristic experimental data, so as to obtain the theoretical available capacity of the target lithium battery in the factory state, calculate the charging aging capacity parameter according to the charging power difference, charging energy and initial available capacity, so as to obtain the aging condition of the current target lithium battery; update the aging detection result based on the latest charging aging capacity parameter and send it to the aging detection display unit, so that the user can know the aging condition of the current target lithium battery, thereby reducing the influence of aging detection on the normal use of the lithium battery, and overcoming the technical problem that the aging detection condition of the lithium battery in the prior art can only be carried out in specific scenarios by regularly performing cyclic charge and discharge tests.

[0070] 2. When it is detected that the target lithium battery enters the charging state, the charging start time and the charging start power are determined, and the battery temperature of the target lithium battery is detected according to the preset temperature sampling period and the temperature time information is generated to analyze the temperature change of the target lithium battery over time; when it is detected that the target lithium battery ends the charging state, the charging end time and the charging end power are determined to facilitate the subsequent analysis of the power obtained in this charging; the average temperature during this charging period is calculated as the charging temperature according to the temperature time information, and the difference between the charging end power and the charging start power is calculated to obtain the charging power difference, so as to determine the proportion of the power obtained in this charging to the current total available power, and obtain the electric energy input during the charging period to determine the electric energy obtained by the target lithium battery through this charging.

[0071] 3. The charging aging capacity parameter is marked with time information, which is convenient for subsequent screening of data used to update the aging detection results from a large number of charging aging capacity parameters, and obtaining all charging aging capacity parameters whose time information falls within the latest evaluation period to calculate the corresponding charging aging capacity average parameter; the charging aging capacity display parameter is calculated based on the charging aging capacity average parameter and the duration of the evaluation period, wherein the difference between the charging aging capacity display parameter and the charging aging capacity average parameter is positively correlated with the duration of the evaluation period, so as to compensate for the aging of the target lithium battery during the evaluation period; the aging detection result is updated based on the charging aging capacity display parameter and sent to the aging detection display unit, so that the user can know the charging aging status of the current target lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1It is a flow chart of the lithium battery aging detection method in Example 1 of the present application.

[0073] Figure 2 It is a principle block diagram of the lithium battery aging detection system in the second embodiment of the present application.

[0074] Figure 3 It is a schematic diagram of the equipment in Example 3 of the present application. DETAILED DESCRIPTION

[0075] The following is combined with Figures 1 to 3 This application is described in further detail.

[0076] Embodiment 1

[0077] Reference Figure 1 The present application discloses a lithium battery aging detection method, which specifically includes the following steps:

[0078] S10: Identify the target model corresponding to the target lithium battery, and obtain corresponding temperature characteristic experimental data based on the target model.

[0079] In this embodiment, the temperature characteristic experimental data includes data on the initial available capacity of the target model lithium battery at different temperatures, wherein the initial available capacity refers to the available capacity calibrated at the time of leaving the factory for the target model lithium battery; the temperature characteristic experimental data may be specifically provided by the manufacturer of the target lithium battery, or may be obtained after experimental testing of the target model lithium battery.

[0080] Specifically, the target model corresponding to the target lithium battery to be monitored is identified to obtain the temperature characteristic experimental data of the target model lithium battery, so as to know the initial available capacity of the target lithium battery at different temperatures.

[0081] S20: When it is detected that the target lithium battery enters a charging state, the charging temperature, charging power difference and charging energy of the target lithium battery during the charging period are obtained.

[0082] Specifically, since it is difficult for lithium batteries to meet the aging detection conditions through regular cyclic charge and discharge tests in specific scenarios, when the target lithium battery is detected to enter the charging state, the charging temperature, charging power difference, and charging energy data of the target lithium battery during the charging period are obtained, so as to facilitate the subsequent calculation of the current available capacity of the target lithium battery according to the impact of the charging energy on the charging power difference during this charging process; this technical solution is particularly suitable for available capacity aging detection of lithium batteries equipped with kinetic energy recovery function and fuel power generation function in extended-range hybrid vehicles, plug-in hybrid new energy vehicles, pure electric vehicles, etc.

[0083] Furthermore, in order to reduce the interference of invalid data, the determination condition for the target lithium battery to enter the charging state may be set to a duration exceeding a specific time, or a charging energy greater than a specific value, etc.

[0084] Wherein, in step S20, it includes:

[0085] S21: When it is detected that the target lithium battery enters a charging state, the charging start time and the charging start power are determined, and the battery temperature of the target lithium battery is detected based on a preset temperature sampling period to generate temperature time information.

[0086] In this embodiment, the charge start power and the charge end power are both data of the ratio of the remaining available capacity to the total available capacity.

[0087] Specifically, when it is detected that the target lithium battery enters the charging state, the charging start time and the charging start power are determined, the battery temperature of the target lithium battery is detected according to the preset temperature sampling period and the temperature time information is generated to analyze the temperature change of the target lithium battery over time.

[0088] S22: When it is detected that the target lithium battery has finished charging, the charging end time and the charging end power are determined.

[0089] Specifically, when it is detected that the target lithium battery has finished charging, the charging end time and the charging end power are determined to facilitate subsequent analysis of the power obtained from this charging.

[0090] S23: Calculate the average temperature during charging according to the temperature-time information and define it as the charging temperature, calculate the difference between the charge at the end of charging and the charge at the start of charging and define it as the charging charge difference, and obtain the input power of the target lithium battery during charging to determine the charging energy.

[0091] In this embodiment, the charging power difference and the charging energy can both be positive or negative.

[0092] Specifically, the average temperature of the target lithium battery during this charging period is calculated as the charging temperature based on the temperature-time information, and the difference between the charging end power and the charging start power is calculated to obtain the charging power difference to determine the proportion of the power obtained in this charging to the current total available power, and the electric energy input during charging is obtained to determine the electric energy obtained by the target lithium battery through this charging.

[0093] S30: Based on the charging temperature, the corresponding initial available capacity is obtained from the temperature characteristic experimental data, and based on the charging power difference, the charging energy and the initial available capacity, the charging aging capacity parameter is calculated.

[0094] In this embodiment, the formula for the charging aging capacity parameter is:

[0095]

[0096] Among them, R1 is the charging aging capacity parameter, E1 is the charging energy, ΔSOC + is the charge difference, and SOC0 is the initial available capacity.

[0097] Specifically, based on the charging temperature, the initial available capacity at the corresponding temperature is obtained from the temperature characteristic experimental data to obtain the theoretical available capacity of the target lithium battery in the factory state, and the charging aging capacity parameter is calculated according to the charging power difference, charging energy and initial available capacity to obtain the aging condition of the current target lithium battery.

[0098] S40: Based on the latest charging aging capacity parameter, the aging detection result is updated and sent to the aging detection display unit.

[0099] In this embodiment, the aging detection display unit may specifically be a device for storing aging detection result data for displaying the aging detection result on the vehicle-mounted device.

[0100] Specifically, the aging detection result is updated based on the latest charging aging capacity parameter and sent to the aging detection display unit so that the user can know the aging condition of the current target lithium battery, thereby reducing the impact of aging detection on the normal use of the lithium battery.

[0101] Wherein, in step S40, it includes:

[0102] S41: Obtain all charging aging capacity parameters of the time information in the latest preset evaluation period, and calculate the corresponding charging aging capacity average parameter.

[0103] In this embodiment, the evaluation period refers to the time period used to update the aging detection results, and the evaluation period can be set according to actual needs; for example, when the evaluation period is one week, this embodiment will calculate the corresponding charging aging capacity average parameter based on several charging aging capacity parameters calculated for each charging within a week; the charging aging capacity average parameter refers to the average value of all charging aging capacity parameters within an evaluation period; the charging aging capacity parameters are all marked with time information.

[0104] Specifically, the charging aging capacity parameters are marked with time information, which facilitates the subsequent screening of data for updating the aging detection results from a large number of charging aging capacity parameters, and obtains all charging aging capacity parameters whose time information falls within the latest evaluation period to calculate the corresponding charging aging capacity average parameters.

[0105] S42: Calculate the charging aging capacity display parameter based on the charging aging capacity average parameter and the duration of the evaluation period.

[0106] In this embodiment, the calculation formula of the charging aging capacity display parameter is:

[0107]

[0108] Among them, R 1D It is the charging aging capacity display parameter. is the average parameter of charging aging capacity, T is the length of the evaluation period, and k is the aging coefficient of the evaluation period; preferably, the length of the evaluation period can be set to seven days, and the aging coefficient of the evaluation period can be set to 1 / (4×365).

[0109] Specifically, the charging aging capacity display parameter is calculated according to the charging aging capacity average parameter and the duration of the evaluation period, wherein the difference between the charging aging capacity display parameter and the charging aging capacity average parameter is positively correlated with the duration of the evaluation period to compensate for the aging of the target lithium battery during the evaluation period.

[0110] S43: updating the aging detection result based on the charging aging capacity display parameter and sending it to the aging detection display unit.

[0111] Specifically, the aging detection result is updated based on the charging aging capacity display parameter and sent to the aging detection display unit, so that the user can know the charging aging status of the current target lithium battery.

[0112] In some feasible solutions, the aging detection of the lithium battery can be performed only when the lithium battery enters the charging state, or the aging detection can be performed each time the lithium battery enters the charging state and the discharging state. If the aging detection is also performed when the lithium battery enters the discharging state, then after step S10, the lithium battery aging detection method further includes:

[0113] S51: When it is detected that the target lithium battery enters a discharging state, the discharge temperature, the discharge power difference and the discharge energy of the target lithium battery during the discharging period are obtained.

[0114] Specifically, since it is difficult for lithium batteries to meet the aging detection conditions through regular cyclic charge and discharge tests in specific scenarios, when the target lithium battery is detected to enter the discharge state, the data of the discharge temperature, discharge power difference, and discharge energy of the target lithium battery during the discharge period are obtained to facilitate the subsequent calculation of the current target lithium battery's available capacity from the impact of the discharge energy on the discharge power difference during this discharge process.

[0115] S52: Based on the discharge temperature, the corresponding initial available capacity is obtained from the temperature characteristic experimental data, and based on the discharge power difference, the discharge energy and the initial available capacity, the discharge aging capacity parameter is calculated.

[0116] In this embodiment, the formula of the discharge aging capacity parameter is:

[0117]

[0118] Among them, R2 is the discharge aging capacity parameter, E2 is the discharge energy, ΔSOC - is the discharge capacity difference, and SOC0 is the initial available capacity.

[0119] Specifically, based on the discharge temperature, the initial available capacity at the corresponding temperature is obtained from the temperature characteristic experimental data to obtain the theoretical available capacity of the target lithium battery in the factory state, and the discharge aging capacity parameter is calculated according to the discharge power difference, discharge energy and initial available capacity to obtain the aging condition of the current target lithium battery.

[0120] Wherein, after step S52, the following steps are included:

[0121] S53: Obtain all discharge aging capacity parameters of the time information in the latest preset evaluation period, and calculate the corresponding discharge aging capacity average parameter.

[0122] In this embodiment, the aging detection result also includes discharge aging capacity display parameters; the charge aging capacity parameters are all marked with time information.

[0123] Specifically, the discharge aging capacity parameter is marked with time information, which is convenient for subsequent screening of data for updating aging detection results from a large number of discharge aging capacity parameters, and obtaining all discharge aging capacity parameters whose time information falls within the latest evaluation period to calculate the corresponding discharge aging capacity average parameter.

[0124] S54: Calculate the discharge aging capacity display parameter based on the average discharge aging capacity parameter and the duration of the evaluation period.

[0125] In this embodiment, the calculation formula of the discharge aging capacity display parameter is:

[0126]

[0127] Among them, R 2D It is the discharge aging capacity display parameter. is the average parameter of discharge aging capacity, T is the length of the evaluation period, and k is the aging coefficient of the evaluation period.

[0128] Specifically, the discharge aging capacity display parameter is calculated according to the discharge aging capacity average parameter and the duration of the evaluation period, wherein the difference between the discharge aging capacity display parameter and the discharge aging capacity average parameter is positively correlated with the duration of the evaluation period to compensate for the aging of the target lithium battery during the evaluation period.

[0129] S55: updating the aging detection result based on the discharge aging capacity display parameter.

[0130] Specifically, the aging detection result is updated based on the discharge aging capacity display parameter, so that the user can comprehensively know the charging aging status and the discharging aging status of the current target lithium battery.

[0131] It should be understood that the serial numbers of the steps in the above embodiments do not imply a sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0132] Embodiment 2

[0133] A lithium battery aging detection system is provided, and the lithium battery aging detection system corresponds to the lithium battery aging detection method in the above embodiment.

[0134] like Figure 2 As shown, the lithium battery aging detection system includes a temperature characteristic experimental data acquisition module, a charging state parameter acquisition module, a charging aging capacity parameter calculation module and an aging detection result display module. The detailed description of each functional module is as follows:

[0135] A temperature characteristic experimental data acquisition module is used to identify the target model corresponding to the target lithium battery and acquire the corresponding temperature characteristic experimental data based on the target model;

[0136] A charging state parameter acquisition module is used to acquire the charging temperature, charging power difference and charging energy of the target lithium battery during charging when it is detected that the target lithium battery enters the charging state;

[0137] a charging aging capacity parameter calculation module, configured to obtain the corresponding initial available capacity from the temperature characteristic experimental data based on the charging temperature, and calculate the charging aging capacity parameter based on the charging power difference, the charging energy and the initial available capacity;

[0138] The aging detection result display module is used to update the aging detection result based on the latest charging aging capacity parameter and send it to the aging detection display unit.

[0139] Among them, the charging state parameter acquisition module also includes:

[0140] Enter the charging state analysis submodule, which is used to determine the charging start time and charging start power when detecting that the target lithium battery enters the charging state, and detect the battery temperature of the target lithium battery based on a preset temperature sampling period to generate temperature time information;

[0141] The end-of-charge state analysis submodule is used to determine the end-of-charge time and end-of-charge power when detecting that the target lithium battery has ended its charge state;

[0142] The charging analysis submodule is used to calculate the average temperature during charging based on the temperature-time information and define it as the charging temperature, calculate the difference between the charge end power and the charge start power and define it as the charging power difference, and obtain the input power of the target lithium battery during charging to determine the charging energy.

[0143] Among them, the aging detection result display module also includes:

[0144] The charging aging capacity average parameter calculation submodule is used to obtain all charging aging capacity parameters within the latest preset evaluation period and calculate the corresponding charging aging capacity average parameter;

[0145] A charging aging capacity display parameter calculation submodule is used to calculate the charging aging capacity display parameter based on the charging aging capacity average parameter and the duration of the evaluation period;

[0146] The charging aging detection result updating submodule is used to update the aging detection result based on the charging aging capacity display parameter and send it to the aging detection display unit.

[0147] Among them, the lithium battery aging detection system also includes:

[0148] A discharge state parameter acquisition module is used to acquire the discharge temperature, discharge power difference and discharge energy of the target lithium battery during the discharge period when it is detected that the target lithium battery enters the discharge state;

[0149] The discharge aging capacity parameter calculation module is used to obtain the corresponding initial available capacity from the temperature characteristic experimental data based on the discharge temperature, and calculate the discharge aging capacity parameter based on the discharge power difference, discharge energy and initial available capacity.

[0150] The discharge aging capacity average parameter calculation module is used to obtain all discharge aging capacity parameters within the latest preset evaluation period and calculate the corresponding discharge aging capacity average parameter;

[0151] A discharge aging capacity display parameter calculation module is used to calculate the discharge aging capacity display parameter based on the average discharge aging capacity parameter and the duration of the evaluation period;

[0152] The discharge aging detection result updating module is used to update the aging detection result based on the discharge aging capacity display parameter.

[0153] For the specific limitations of the lithium battery aging detection system, please refer to the limitations of the lithium battery aging detection method above, which will not be repeated here; the various modules in the above-mentioned lithium battery aging detection system can be implemented in whole or in part through software, hardware and their combination; the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of the above modules.

[0154] Embodiment 3

[0155] A computer device, which may be a server, may have an internal structure as shown in Figure 3 As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as target model, temperature characteristic experimental data, charging temperature, charging power difference, charging energy, initial available capacity, charging aging capacity parameters and aging detection results. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a lithium battery aging detection method is implemented.

[0156] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0157] S10: Identify the target model corresponding to the target lithium battery, and obtain corresponding temperature characteristic experimental data based on the target model;

[0158] S20: when it is detected that the target lithium battery enters a charging state, obtaining a charging temperature, a charging power difference, and a charging energy of the target lithium battery during charging;

[0159] S30: based on the charging temperature, obtaining the corresponding initial available capacity from the temperature characteristic experimental data, and calculating the charging aging capacity parameter based on the charging power difference, the charging energy and the initial available capacity;

[0160] S40: Based on the latest charging aging capacity parameter, the aging detection result is updated and sent to the aging detection display unit.

[0161] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0162] S10: Identify the target model corresponding to the target lithium battery, and obtain corresponding temperature characteristic experimental data based on the target model;

[0163] S20: when it is detected that the target lithium battery enters a charging state, obtaining a charging temperature, a charging power difference, and a charging energy of the target lithium battery during charging;

[0164] S30: based on the charging temperature, obtaining the corresponding initial available capacity from the temperature characteristic experimental data, and calculating the charging aging capacity parameter based on the charging power difference, the charging energy and the initial available capacity;

[0165] S40: Based on the latest charging aging capacity parameter, the aging detection result is updated and sent to the aging detection display unit.

[0166] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink), DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0167] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0168] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the features thereof may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A lithium battery aging detection method, characterized in that: include: Identify the target model corresponding to the target lithium battery, and obtain the corresponding temperature characteristic experimental data based on the target model; When it is detected that the target lithium battery enters a charging state, the charging temperature, charging power difference and charging energy of the target lithium battery during charging are obtained; Based on the charging temperature, obtaining the corresponding initial available capacity from the temperature characteristic experimental data, and calculating the charging aging capacity parameter based on the charging power difference, the charging energy and the initial available capacity; Based on the latest charging aging capacity parameter, the aging detection result is updated and sent to the aging detection display unit; The formula for the charging aging capacity parameter is: Among them, R1 is the charging aging capacity parameter, E1 is the charging energy, ΔSOC + is the charge power difference, SOC0 is the initial available capacity; the temperature characteristic experimental data includes data on the initial available capacity of the target model lithium battery at different temperatures; Wherein, when it is detected that the target lithium battery is in a charging state, obtaining the charging temperature, charging power difference and charging energy of the target lithium battery during charging includes: When it is detected that the target lithium battery enters the charging state, the charging start time and the charging start power are determined, and the battery temperature of the target lithium battery is detected based on a preset temperature sampling period to generate temperature time information; When the target lithium battery is detected to be in a charging state, the charging end time and charging end power are determined; The average temperature during charging is calculated based on the temperature-time information and defined as the charging temperature, the difference between the charge end power and the charge start power is calculated and defined as the charging power difference, and the input power of the target lithium battery during charging is obtained to determine the charging energy; Wherein, the charging aging capacity parameters are all marked with time information; The updating of the aging detection result based on the latest charging aging capacity parameter and sending the result to the aging detection display unit includes: Obtain all charging aging capacity parameters within the latest preset evaluation period, and calculate the corresponding average charging aging capacity parameters; Calculate the charging aging capacity display parameters based on the average charging aging capacity parameters and the duration of the evaluation period; Update the aging detection result based on the charging aging capacity display parameter and send it to the aging detection display unit; Among them, the calculation formula of the charging aging capacity display parameter is: Among them, R 1D It is the charging aging capacity display parameter. is the average parameter of charging aging capacity, T is the length of the evaluation period, and k is the aging coefficient of the evaluation period.

2. The lithium battery aging detection method according to claim 1, characterized in that: After identifying the target model corresponding to the target lithium battery and acquiring the corresponding temperature characteristic experimental data based on the target model, the method further includes: When it is detected that the target lithium battery enters a discharge state, the discharge temperature, discharge power difference and discharge energy of the target lithium battery during the discharge period are obtained; Based on the discharge temperature, obtaining the corresponding initial available capacity from the temperature characteristic experimental data, and calculating the discharge aging capacity parameter based on the discharge power difference, the discharge energy and the initial available capacity; The formula for the discharge aging capacity parameter is: Among them, R2 is the discharge aging capacity parameter, E2 is the discharge energy, ΔSOC - is the discharge capacity difference, and SOC0 is the initial available capacity.

3. The lithium battery aging detection method according to claim 2, characterized in that: The aging detection result also includes a discharge aging capacity display parameter; the charging aging capacity parameters are all marked with time information; After obtaining the corresponding initial available capacity from the temperature characteristic experimental data based on the discharge temperature, and calculating the discharge aging capacity parameter based on the discharge power difference, the discharge energy and the initial available capacity, the method further includes: Obtain all discharge aging capacity parameters within the latest preset evaluation period, and calculate the corresponding average discharge aging capacity parameters; Calculate the discharge aging capacity display parameters based on the average discharge aging capacity parameters and the duration of the evaluation period; Update aging test results based on discharge aging capacity display parameters; Among them, the calculation formula of the discharge aging capacity display parameter is: Among them, R 2D It is the discharge aging capacity display parameter. is the average parameter of discharge aging capacity, T is the length of the evaluation period, and k is the aging coefficient of the evaluation period.

4. Lithium battery aging detection system, characterized in that: The lithium battery aging detection method according to any one of claims 1 to 3, wherein the lithium battery aging detection system comprises: A temperature characteristic experimental data acquisition module is used to identify the target model corresponding to the target lithium battery and acquire the corresponding temperature characteristic experimental data based on the target model; A charging state parameter acquisition module is used to acquire the charging temperature, charging power difference and charging energy of the target lithium battery during charging when it is detected that the target lithium battery enters the charging state; a charging aging capacity parameter calculation module, configured to obtain the corresponding initial available capacity from the temperature characteristic experimental data based on the charging temperature, and calculate the charging aging capacity parameter based on the charging power difference, the charging energy and the initial available capacity; An aging detection result display module, used to update the aging detection result based on the latest charging aging capacity parameter and send it to the aging detection display unit; The formula for the charging aging capacity parameter is: Among them, R1 is the charging aging capacity parameter, E1 is the charging energy, ΔSOC + is the charge power difference, SOC0 is the initial available capacity; the temperature characteristic experimental data includes data on the initial available capacity of the target model lithium battery at different temperatures; Wherein, the charging state parameter acquisition module includes: Enter the charging state analysis submodule, which is used to determine the charging start time and charging start power when detecting that the target lithium battery enters the charging state, and detect the battery temperature of the target lithium battery based on a preset temperature sampling period to generate temperature time information; The end-of-charge state analysis submodule is used to determine the end-of-charge time and end-of-charge power when detecting that the target lithium battery has ended its charge state; The charging period analysis submodule is used to calculate the average temperature during the charging period according to the temperature time information and define it as the charging temperature, calculate the difference between the charge end power and the charge start power and define it as the charging power difference, and obtain the input power of the target lithium battery during the charging period to determine the charging energy; Wherein, the aging detection result display module includes: The charging aging capacity average parameter calculation submodule is used to obtain all charging aging capacity parameters within the latest preset evaluation period and calculate the corresponding charging aging capacity average parameter; A charging aging capacity display parameter calculation submodule is used to calculate the charging aging capacity display parameter based on the charging aging capacity average parameter and the duration of the evaluation period; A charging aging detection result updating submodule, used to update the aging detection result based on the charging aging capacity display parameter and send it to the aging detection display unit; Among them, the calculation formula of the charging aging capacity display parameter is: Among them, R 1D It is the charging aging capacity display parameter. is the average parameter of charging aging capacity, T is the duration of the evaluation period, k is the time efficiency coefficient of the evaluation period, and the charging aging capacity parameters are all marked with time information.

5. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the lithium battery aging detection method according to any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the lithium battery aging detection method according to any one of claims 1 to 3 are implemented.

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