Solid-state battery performance test method and system based on data analysis

Abstract

The invention provides a solid-state battery performance testing method and system based on data analysis. The method comprises the following steps: carrying out a constant-current charging and discharging test on a target solid-state battery, processing to obtain a battery capacity steady-state index, carrying out a charging and discharging voltage curve test on the target solid-state battery, processing to obtain a battery polarization change degree index, carrying out an alternating-current impedance method internal resistance test on the target solid-state battery, and processing to obtain a battery internal resistance characteristic index. Carrying out standard cycle life testing on the target solid-state battery, processing to obtain a battery performance degradation index, carrying out thermal stability testing on the target solid-state battery, processing to obtain a battery thermal stability index, and processing by combining a battery capacity steady-state index, a battery polarization change index, a battery internal resistance characteristic index and the battery performance degradation index to obtain the battery performance degradation index. A battery performance comprehensive evaluation index is obtained, performance qualification judgment is carried out on the target solid-state battery, corresponding improvement measures are taken, and therefore the solid-state battery performance testing technology based on data analysis is achieved.

Description

Technical Field

[0001] The present application relates to the field of solid-state battery technology, and more specifically, to a solid-state battery performance testing method and system based on data analysis. Background Art

[0002] As a new generation of battery technology, solid-state batteries have many advantages such as high energy density and good safety. Their performance testing is crucial to promoting the industrial development of solid-state batteries. Traditional performance tests often simply record the basic parameters of the battery such as voltage and current during the charge and discharge cycle. It is difficult to comprehensively and deeply analyze the changing trends and internal mechanisms of battery performance, and the data processing and analysis methods lack systematicity and efficiency, and cannot comprehensively and dynamically evaluate the safety performance of solid-state batteries.

[0003] In view of the above problems, effective technical solutions are urgently needed. Summary of the invention

[0004] The purpose of the present application is to provide a solid-state battery performance testing method and system based on data analysis, which can respectively perform constant current charge and discharge test, charge and discharge voltage curve test, AC impedance internal resistance test, standard cycle life test and thermal stability test on the target solid-state battery, and respectively process and obtain the corresponding battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index, battery performance attenuation index and battery thermal stability index, process the above indexes to obtain a comprehensive battery performance evaluation index, and perform performance qualification judgment on the target solid-state battery and take corresponding improvement measures, thereby realizing the technology of solid-state battery performance testing based on data analysis.

[0005] The present application also provides a solid-state battery performance testing method based on data analysis, comprising the following steps: Perform constant current charge and discharge test on the target solid-state battery, and obtain the battery capacity steady-state index according to the constant current charge and discharge test result; Performing a charge-discharge voltage curve test on the target solid-state battery, and obtaining a battery polarization change index according to the charge-discharge voltage curve test result; Performing an AC impedance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance test result; Performing a standard cycle life test on the target solid-state battery, and obtaining a battery performance attenuation index according to the standard cycle life test result; Performing a thermal stability test on the target solid-state battery, and obtaining a battery thermal stability index according to the thermal stability test result; According to the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index, combined with the battery thermal stability index, a battery performance comprehensive evaluation index is obtained, and the performance qualification of the target solid-state battery is determined and corresponding improvement measures are taken.

[0006] Optionally, in the solid-state battery performance testing method based on data analysis described in the present application, the constant current charge and discharge test is performed on the target solid-state battery, and the battery capacity steady-state index is obtained according to the constant current charge and discharge test result, including: Perform constant current charge and discharge tests on the target solid-state battery, including constant current charge test and constant current discharge test; Acquire the test result record data of the constant current charging test, and extract and process to obtain charging cut-off voltage data, charging rate data and charging time data; Acquire the test result record data of the constant current discharge test, and extract and process to obtain discharge cut-off voltage data, discharge rate data and discharge time data; The battery capacity steady-state index is obtained by processing the charge cut-off voltage data, the charge rate data and the charge time data in combination with the discharge cut-off voltage data, the discharge rate data and the discharge time data.

[0007] Optionally, in the solid-state battery performance testing method based on data analysis described in the present application, the charging and discharging voltage curve test is performed on the target solid-state battery, and the battery polarization change index is obtained according to the charging and discharging voltage curve test result, including: Performing a charge and discharge voltage curve test on the target solid-state battery, including a charge voltage curve test and a discharge voltage curve test; Obtaining test result record data of the charging voltage curve test, and extracting and processing to obtain charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data; Acquire the test result record data of the discharge voltage curve test, and extract and process to obtain discharge platform height data, discharge platform length data, discharge polarization voltage data and discharge voltage change rate data; The battery polarization variation index is obtained by processing the charging platform height data, the charging platform length data, the charging polarization voltage data and the charging voltage change rate data in combination with the discharge platform height data, the discharge platform length data, the discharge polarization voltage data and the discharge voltage change rate data.

[0008] Optionally, in the solid-state battery performance test method based on data analysis described in the present application, performing an AC impedance method internal resistance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance method internal resistance test result, includes: Performing an AC impedance test on the target solid-state battery and obtaining AC impedance test result record data; Extract and process the recorded data of the internal resistance test result of the AC impedance method to obtain high-frequency area data, medium-frequency area data and low-frequency area data; The high frequency region data includes ohmic internal resistance data; The intermediate frequency region data includes charge transfer resistance data and double layer capacitance data; The low-frequency region data includes diffusion resistance data and inductance data; The ohmic internal resistance data, the charge transfer resistance data and the double-layer capacitance data are processed in combination with the diffusion resistance data and the inductance data to obtain a battery internal resistance characteristic index.

[0009] Optionally, in the solid-state battery performance testing method based on data analysis described in the present application, performing a standard cycle life test on the target solid-state battery, and obtaining a battery performance attenuation index according to the standard cycle life test result, includes: Performing a standard cycle life test on the target solid-state battery and obtaining standard cycle life test result record data; Extract and process the recorded data of the standard cycle life test result to obtain capacity decay rate data, internal resistance growth rate data and energy density decay rate data; The battery performance attenuation index is obtained by processing the capacity attenuation rate data, the internal resistance growth rate data, and the energy density attenuation rate data.

[0010] Optionally, in the solid-state battery performance testing method based on data analysis described in the present application, the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index are processed in combination with the battery thermal stability index to obtain a battery performance comprehensive evaluation index, and the performance qualification of the target solid-state battery is determined and corresponding improvement measures are taken, including: According to the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index, the battery thermal stability index is processed by a preset battery performance detection model to obtain a battery performance comprehensive evaluation index; Comparing the battery performance comprehensive evaluation index with a preset battery performance comprehensive evaluation threshold to obtain a threshold comparison result; Performing performance qualification determination on the target solid-state battery according to the threshold comparison result; If the performance of the target solid-state battery is unsatisfactory, corresponding improvement measures are taken.

[0011] In a second aspect, the present application provides a solid-state battery performance testing system based on data analysis, the system comprising: a memory and a processor, the memory comprising a program of a solid-state battery performance testing method based on data analysis, and the program of the solid-state battery performance testing method based on data analysis is executed by the processor to implement the following steps: Perform constant current charge and discharge test on the target solid-state battery, and obtain the battery capacity steady-state index according to the constant current charge and discharge test result; Performing a charge-discharge voltage curve test on the target solid-state battery, and obtaining a battery polarization change index according to the charge-discharge voltage curve test result; Performing an AC impedance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance test result; Performing a standard cycle life test on the target solid-state battery, and obtaining a battery performance attenuation index according to the standard cycle life test result; Performing a thermal stability test on the target solid-state battery, and obtaining a battery thermal stability index according to the thermal stability test result; According to the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index, combined with the battery thermal stability index, a battery performance comprehensive evaluation index is obtained, and the performance qualification of the target solid-state battery is determined and corresponding improvement measures are taken.

[0012] Optionally, in the solid-state battery performance test system based on data analysis described in the present application, the constant current charge and discharge test is performed on the target solid-state battery, and the battery capacity steady-state index is obtained according to the constant current charge and discharge test result, including: Perform constant current charge and discharge tests on the target solid-state battery, including constant current charge test and constant current discharge test; Acquire the test result record data of the constant current charging test, and extract and process to obtain charging cut-off voltage data, charging rate data and charging time data; Acquire the test result record data of the constant current discharge test, and extract and process to obtain discharge cut-off voltage data, discharge rate data and discharge time data; The battery capacity steady-state index is obtained by processing the charge cut-off voltage data, the charge rate data and the charge time data in combination with the discharge cut-off voltage data, the discharge rate data and the discharge time data.

[0013] Optionally, in the solid-state battery performance test system based on data analysis described in the present application, the charging and discharging voltage curve test is performed on the target solid-state battery, and the battery polarization change index is obtained according to the charging and discharging voltage curve test result, including: Performing a charge and discharge voltage curve test on the target solid-state battery, including a charge voltage curve test and a discharge voltage curve test; Obtaining test result record data of the charging voltage curve test, and extracting and processing to obtain charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data; Acquire the test result record data of the discharge voltage curve test, and extract and process to obtain discharge platform height data, discharge platform length data, discharge polarization voltage data and discharge voltage change rate data; The battery polarization variation index is obtained by processing the charging platform height data, the charging platform length data, the charging polarization voltage data and the charging voltage change rate data in combination with the discharge platform height data, the discharge platform length data, the discharge polarization voltage data and the discharge voltage change rate data.

[0014] Optionally, in the solid-state battery performance test system based on data analysis described in the present application, performing an AC impedance method internal resistance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance method internal resistance test result, includes: Performing an AC impedance test on the target solid-state battery and obtaining AC impedance test result record data; Extract and process the recorded data of the internal resistance test result of the AC impedance method to obtain high-frequency area data, medium-frequency area data and low-frequency area data; The high frequency region data includes ohmic internal resistance data; The intermediate frequency region data includes charge transfer resistance data and double layer capacitance data; The low-frequency region data includes diffusion resistance data and inductance data; The ohmic internal resistance data, the charge transfer resistance data and the double-layer capacitance data are processed in combination with the diffusion resistance data and the inductance data to obtain a battery internal resistance characteristic index.

[0015] As can be seen from the above, the solid-state battery performance testing method and system based on data analysis provided in the present application, by performing a constant current charge and discharge test on the target solid-state battery, obtaining a battery capacity steady-state index according to the constant current charge and discharge test results, performing a charge and discharge voltage curve test on the target solid-state battery, obtaining a battery polarization change index according to the charge and discharge voltage curve test results, performing an AC impedance internal resistance test on the target solid-state battery, obtaining a battery internal resistance characteristic index according to the AC impedance internal resistance test results, performing a standard cycle life test on the target solid-state battery, obtaining a battery performance attenuation index according to the standard cycle life test results, performing a thermal stability test on the target solid-state battery, obtaining a battery thermal stability index according to the thermal stability test results, processing according to the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index, combined with the battery thermal stability index, obtaining a battery performance comprehensive evaluation index, and determining the performance eligibility of the target solid-state battery and taking corresponding improvement measures, thereby realizing the technology of solid-state battery performance testing based on data analysis.

[0016] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a solid-state battery performance testing method based on data analysis provided in an embodiment of the present application; Figure 2 A flow chart of obtaining a battery capacity steady-state index in a solid-state battery performance testing method based on data analysis provided in an embodiment of the present application; Figure 3 A flow chart of obtaining a battery polarization variation index in a solid-state battery performance testing method based on data analysis provided in an embodiment of the present application; Figure 4 A flow chart of obtaining a battery internal resistance characteristic index in a solid-state battery performance testing method based on data analysis provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0020] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0021] Please refer to Figure 1 , Figure 1 The flowchart of the solid-state battery performance test method based on data analysis in some embodiments of the present application. The solid-state battery performance test method based on data analysis is used in terminal equipment, such as computers, mobile phone terminals, etc. The solid-state battery performance test method based on data analysis includes the following steps: S11, performing a constant current charge and discharge test on the target solid-state battery, and obtaining a battery capacity steady-state index according to the constant current charge and discharge test results; S12, performing a charge-discharge voltage curve test on the target solid-state battery, and obtaining a battery polarization change index according to the charge-discharge voltage curve test result; S13, performing an AC impedance method internal resistance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance method internal resistance test result; S14, performing a standard cycle life test on the target solid-state battery, and obtaining a battery performance attenuation index according to the standard cycle life test result; S15, performing a thermal stability test on the target solid-state battery, and obtaining a battery thermal stability index according to the thermal stability test result; S16. According to the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index, combined with the battery thermal stability index, a battery performance comprehensive evaluation index is obtained, and the performance qualification of the target solid-state battery is determined and corresponding improvement measures are taken.

[0022] It should be noted that solid-state batteries, as a new generation of battery technology, have many advantages such as high energy density and good safety. Their performance testing is crucial to promoting the industrialization of solid-state batteries. Traditional performance testing often simply records the basic parameters of the battery during the charge and discharge cycle, such as voltage and current, and it is difficult to comprehensively and deeply analyze the changing trends and internal mechanisms of battery performance, and lacks systematicity and efficiency in data processing and analysis methods, and cannot comprehensively and dynamically evaluate the safety performance of solid-state batteries. Therefore, it is necessary to study a solid-state battery performance testing method based on data analysis, which can comprehensively and deeply analyze the changing trends and internal mechanisms of battery performance, and is systematic and efficient in data processing and analysis methods, as well as comprehensively and dynamically evaluate the safety performance of solid-state batteries. In this regard, in this embodiment, a constant current charge and discharge test is first performed on the target solid-state battery, and the constant current charge and discharge test results are processed to obtain The battery capacity steady-state index is obtained, the charge and discharge voltage curve test is performed on the target solid-state battery, and the battery polarization change index is obtained according to the charge and discharge voltage curve test results. The target solid-state battery is tested for internal resistance by AC impedance method, and the battery internal resistance characteristic index is obtained according to the AC impedance internal resistance test results. The target solid-state battery is tested for standard cycle life, and the battery performance attenuation index is obtained according to the standard cycle life test results. The target solid-state battery is tested for thermal stability, and the battery thermal stability index is obtained according to the thermal stability test results. The battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index are processed in combination with the battery thermal stability index to obtain a comprehensive battery performance evaluation index, and the target solid-state battery is judged for performance qualification and corresponding improvement measures are taken, thereby realizing the technology of solid-state battery performance testing based on data analysis.

[0023] Please refer to Figure 2 , Figure 2 The present invention is a flowchart of obtaining a battery capacity steady-state index in a solid-state battery performance test method based on data analysis in some embodiments of the present application. According to an embodiment of the present invention, the constant current charge and discharge test is performed on the target solid-state battery, and the battery capacity steady-state index is obtained according to the constant current charge and discharge test result, including: S21. Performing constant current charge and discharge tests on the target solid-state battery, including constant current charge test and constant current discharge test; S22, obtaining the test result record data of the constant current charging test, and extracting and processing to obtain charging cut-off voltage data, charging rate data and charging time data; S23, obtaining the test result record data of the constant current discharge test, and extracting and processing to obtain the discharge cut-off voltage data, the discharge rate data and the discharge time data; S24, processing the charge cut-off voltage data, the charge rate data, and the charge time data in combination with the discharge cut-off voltage data, the discharge rate data, and the discharge time data to obtain a battery capacity steady-state index.

[0024] It should be noted that solid-state batteries are charged and discharged at a fixed current within a specific temperature and voltage range. For example, at 25°C, the current is 0.5C (C The battery is charged with a current of 100V (the current rate corresponding to the rated capacity of the battery) until the battery voltage reaches the charging cut-off voltage (such as 4.2V for the lithium battery), and then discharged with the same current until the voltage drops to the discharge cut-off voltage (such as 3.0V). At the same time, the test result record data of the constant current charging test is obtained, and the charging cut-off voltage data, the charging rate data and the charging time data are extracted and processed to obtain the charging cut-off voltage data, the charging rate data and the charging time data, wherein the charging cut-off voltage refers to the highest voltage that the battery can reach when charging, and the charging time refers to the time required for the battery to reach the charging cut-off voltage from the beginning of charging, the test result record data of the constant current discharge test is obtained, and the discharge cut-off voltage data, the discharge rate data and the discharge time data are extracted and processed to obtain the discharge cut-off voltage data, the discharge rate data and the discharge time data, wherein the discharge cut-off voltage refers to the lowest voltage that the battery can reach when discharging, and the discharge time refers to the time required for the battery to reach the discharge cut-off voltage from the beginning of discharging, and finally, the battery capacity steady-state index is obtained according to the charging cut-off voltage data, the charging rate data and the charging time data, combined with the discharge cut-off voltage data, the discharge rate data and the discharge time data; Wherein, the calculation formula of the battery capacity steady-state index is: ; in, is the battery capacity steady-state index, , , They are charging cut-off voltage data, charging rate data, and charging time data. , , They are discharge cut-off voltage data, discharge rate data, and discharge time data. , , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0025] Please refer to Figure 3 , Figure 3The present invention is a flowchart of obtaining a battery polarization change index in a solid-state battery performance test method based on data analysis in some embodiments of the present application. According to an embodiment of the present invention, the target solid-state battery is subjected to a charge and discharge voltage curve test, and the battery polarization change index is obtained according to the charge and discharge voltage curve test result, including: S31, performing a charge and discharge voltage curve test on the target solid-state battery, including a charge voltage curve test and a discharge voltage curve test; S32, obtaining the test result record data of the charging voltage curve test, and extracting and processing the charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data; S33, obtaining the test result record data of the discharge voltage curve test, and extracting and processing to obtain the discharge platform height data, the discharge platform length data, the discharge polarization voltage data and the discharge voltage change rate data; S34, according to the charging platform height data, the charging platform length data, the charging polarization voltage data and the charging voltage change rate data, combined with the discharge platform height data, the discharge platform length data, the discharge polarization voltage data and the discharge voltage change rate data, processing is performed to obtain a battery polarization change index.

[0026] It should be noted that during the charge and discharge process, the battery voltage change curve over time or capacity is recorded, and the battery polarization state is obtained through processing. Therefore, the test result record data of the charging voltage curve test is obtained, and the charging platform height, charging platform length, charging polarization voltage and charging voltage change rate data are extracted and processed. Among them, during the charging process, the solid-state battery will have a stage where the voltage is relatively stable. The voltage value in this stage is the charging platform height. The charging platform length refers to the duration of the voltage platform in the entire charging curve. During the charging process, due to the internal resistance and electrochemical polarization of the battery, the actual voltage of the battery will be higher than the theoretical voltage in its equilibrium state. This excess voltage The voltage part is the charge polarization voltage. The test result record data of the discharge voltage curve test is obtained, and the discharge platform height, discharge platform length, discharge polarization voltage and discharge voltage change rate data are extracted and processed. Among them, during the discharge process, the solid-state battery will have a relatively stable voltage stage. The voltage value of this stage is the discharge platform height. The discharge platform length refers to the duration of the voltage platform in the entire discharge curve. During the discharge process, due to the internal resistance and electrochemical polarization of the battery, the actual voltage of the battery will be lower than the theoretical voltage in its equilibrium state. This low voltage part is the discharge polarization voltage. Finally, the above data is processed to obtain the battery polarization change index; Wherein, the calculation formula of the battery polarization change index is: ; in, is the battery polarization variation index, , , , They are charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data. , , , They are the discharge platform height data, discharge platform length data, discharge polarization voltage data, and discharge voltage change rate data. , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0027] Please refer to Figure 4 , Figure 4 The present invention is a flowchart of obtaining a battery internal resistance characteristic index in a solid-state battery performance test method based on data analysis in some embodiments of the present application. According to an embodiment of the present invention, the target solid-state battery is subjected to an AC impedance method internal resistance test, and the battery internal resistance characteristic index is obtained according to the AC impedance method internal resistance test result, including: S41, performing an AC impedance method internal resistance test on the target solid-state battery, and obtaining AC impedance method internal resistance test result record data; S42, extracting and processing the recorded data of the internal resistance test result of the AC impedance method to obtain high-frequency area data, medium-frequency area data and low-frequency area data; S43, the high frequency region data includes ohmic internal resistance data; S44, the intermediate frequency region data includes charge transfer resistance data and double layer capacitance data; S45, the low frequency region data includes diffusion resistance data and inductance data; S46, processing the ohmic internal resistance data, the charge transfer resistance data and the double-layer capacitance data in combination with the diffusion resistance data and the inductance data to obtain a battery internal resistance characteristic index.

[0028] It should be noted that the AC impedance method internal resistance test refers to applying a small amplitude AC signal (the frequency range is usually from a few hertz to hundreds of kilohertz) to the solid-state battery, and measuring the voltage response and input current at both ends of the battery. By calculating the complex ratio of voltage to current, the AC impedance spectrum of the battery can be obtained. In the high-frequency region of the AC impedance spectrum, the impedance mainly reflects the ohmic internal resistance of the solid-state battery. The impedance in the medium-frequency region is closely related to the charge transfer process on the surface of the battery electrode. The corresponding characteristic data are the charge transfer resistance and the double-layer capacitance data. The impedance in the low-frequency region is mainly related to the diffusion process of lithium ions inside the solid-state battery. The corresponding characteristic data are the diffusion resistance (also known as Warburg impedance) and inductance data. Finally, the above data are processed to obtain the battery internal resistance characteristic index; Wherein, the calculation formula of the battery internal resistance characteristic index is: ; in, is the battery internal resistance characteristic index, is the ohm internal resistance data, , They are charge transfer resistance data and double layer capacitance data respectively. , They are diffusion resistance data and inductance data respectively. , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0029] According to an embodiment of the present invention, performing a standard cycle life test on the target solid-state battery and obtaining a battery performance attenuation index according to the standard cycle life test result includes: Performing a standard cycle life test on the target solid-state battery and obtaining standard cycle life test result record data; Extract and process the recorded data of the standard cycle life test result to obtain capacity decay rate data, internal resistance growth rate data and energy density decay rate data; The battery performance attenuation index is obtained by processing the capacity attenuation rate data, the internal resistance growth rate data, and the energy density attenuation rate data.

[0030] It should be noted that the standard cycle life test refers to multiple cycles of charging and discharging of solid-state batteries under specified charging and discharging conditions (such as temperature, current rate, voltage range, etc.). For example, at 25°C, charge to 4.2V at a rate of 0.5C, and then discharge to 3.0V at a rate of 0.5C. This process is repeated, and the capacity, internal resistance, voltage and other data after each cycle are recorded, and then extracted and processed to obtain the capacity decay rate, internal resistance growth rate and energy density decay rate data, and then processed according to the above data to obtain the battery performance decay index; The calculation formula of the battery performance attenuation index is: ; in, is the battery performance attenuation index, , , They are capacity attenuation rate data, internal resistance growth rate data, and energy density attenuation rate data. , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0031] According to an embodiment of the present invention, the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index are processed in combination with the battery thermal stability index to obtain a battery performance comprehensive evaluation index, and the target solid-state battery is subjected to performance qualification determination and corresponding improvement measures are taken, including: According to the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index, the battery thermal stability index is processed by a preset battery performance detection model to obtain a battery performance comprehensive evaluation index; Comparing the battery performance comprehensive evaluation index with a preset battery performance comprehensive evaluation threshold to obtain a threshold comparison result; Performing performance qualification determination on the target solid-state battery according to the threshold comparison result; If the performance of the target solid-state battery is unsatisfactory, corresponding improvement measures are taken.

[0032] It should be noted that the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index obtained by processing are combined with the battery thermal stability index through the calculation formula of the preset battery performance detection model to obtain the battery performance comprehensive evaluation index, and then compared with the preset battery performance comprehensive evaluation threshold to obtain the threshold comparison result, and the performance qualification of the target solid-state battery is determined according to the threshold comparison result. If the threshold comparison result is not within the threshold range, the performance of the target solid-state battery is unqualified, and corresponding improvement measures are taken; Wherein, the calculation formula of the comprehensive evaluation index of battery performance is: ; in, is the comprehensive evaluation index of battery performance, , , , , They are battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index, battery performance attenuation index, and battery thermal stability index. , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0033] According to an embodiment of the present invention, it also includes: The step of performing a thermal stability test on the target solid-state battery and obtaining a battery thermal stability index according to the thermal stability test result specifically includes: Performing a thermal stability test on the target solid-state battery and obtaining record data of the thermal stability test results; Extract and process the recorded data of the thermal stability test results to obtain the starting thermal runaway temperature data, the heating rate data, the cooling rate data and the maximum internal resistance data; Processing the starting thermal runaway temperature data, the heating rate data, the cooling rate data, and the maximum internal resistance data to obtain a battery thermal stability index; Wherein, the calculation formula of the battery thermal stability index is: ; in, is the battery thermal stability index, , , , They are the starting thermal runaway temperature data, heating rate data, cooling rate data, and maximum internal resistance data. , , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0034] It should be noted that the thermal stability test refers to placing the solid-state battery in a specific hot box, raising the temperature at a certain heating rate (such as 5°C / min), and monitoring the temperature, pressure, voltage and other data inside the battery. The data is then extracted and processed to obtain the starting thermal runaway temperature, heating rate, cooling rate and maximum internal resistance data. The starting thermal runaway temperature is the temperature at which the solid-state battery begins to experience thermal runaway during the thermal stability test. The data is then processed based on the above data to obtain the battery thermal stability index.

[0035] In a second aspect, the present invention further discloses a solid-state battery performance test system based on data analysis, comprising a memory and a processor, wherein the memory comprises a solid-state battery performance test method program based on data analysis, and when the solid-state battery performance test method program based on data analysis is executed by the processor, the following steps are implemented: Perform constant current charge and discharge test on the target solid-state battery, and obtain the battery capacity steady-state index according to the constant current charge and discharge test result; Performing a charge-discharge voltage curve test on the target solid-state battery, and obtaining a battery polarization change index according to the charge-discharge voltage curve test result; Performing an AC impedance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance test result; Performing a standard cycle life test on the target solid-state battery, and obtaining a battery performance attenuation index according to the standard cycle life test result; Performing a thermal stability test on the target solid-state battery, and obtaining a battery thermal stability index according to the thermal stability test result; According to the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index, combined with the battery thermal stability index, a battery performance comprehensive evaluation index is obtained, and the performance qualification of the target solid-state battery is determined and corresponding improvement measures are taken.

[0036] It should be noted that solid-state batteries, as a new generation of battery technology, have many advantages such as high energy density and good safety. Their performance testing is crucial to promoting the industrialization of solid-state batteries. Traditional performance testing often simply records the basic parameters of the battery during the charge and discharge cycle, such as voltage and current, and it is difficult to comprehensively and deeply analyze the changing trends and internal mechanisms of battery performance, and lacks systematicity and efficiency in data processing and analysis methods, and cannot comprehensively and dynamically evaluate the safety performance of solid-state batteries. Therefore, it is necessary to study a solid-state battery performance testing method based on data analysis, which can comprehensively and deeply analyze the changing trends and internal mechanisms of battery performance, and is systematic and efficient in data processing and analysis methods, as well as comprehensively and dynamically evaluate the safety performance of solid-state batteries. In this regard, in this embodiment, a constant current charge and discharge test is first performed on the target solid-state battery, and the constant current charge and discharge test results are processed to obtain The battery capacity steady-state index is obtained, the charge and discharge voltage curve test is performed on the target solid-state battery, and the battery polarization change index is obtained according to the charge and discharge voltage curve test results. The target solid-state battery is tested for internal resistance by AC impedance method, and the battery internal resistance characteristic index is obtained according to the AC impedance internal resistance test results. The target solid-state battery is tested for standard cycle life, and the battery performance attenuation index is obtained according to the standard cycle life test results. The target solid-state battery is tested for thermal stability, and the battery thermal stability index is obtained according to the thermal stability test results. The battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index are processed in combination with the battery thermal stability index to obtain a comprehensive battery performance evaluation index, and the target solid-state battery is judged for performance qualification and corresponding improvement measures are taken, thereby realizing the technology of solid-state battery performance testing based on data analysis.

[0037] According to an embodiment of the present invention, the constant current charge and discharge test is performed on the target solid-state battery, and the battery capacity steady-state index is obtained according to the constant current charge and discharge test result, including: Perform constant current charge and discharge tests on the target solid-state battery, including constant current charge test and constant current discharge test; Acquire the test result record data of the constant current charging test, and extract and process to obtain charging cut-off voltage data, charging rate data and charging time data; Acquire the test result record data of the constant current discharge test, and extract and process to obtain discharge cut-off voltage data, discharge rate data and discharge time data; The battery capacity steady-state index is obtained by processing the charge cut-off voltage data, the charge rate data and the charge time data in combination with the discharge cut-off voltage data, the discharge rate data and the discharge time data.

[0038] It should be noted that solid-state batteries are charged and discharged at a fixed current within a specific temperature and voltage range. For example, at 25°C, the current is 0.5C (C The battery is charged with a current of 100V (the current rate corresponding to the rated capacity of the battery) until the battery voltage reaches the charging cut-off voltage (such as 4.2V for the lithium battery), and then discharged with the same current until the voltage drops to the discharge cut-off voltage (such as 3.0V). At the same time, the test result record data of the constant current charging test is obtained, and the charging cut-off voltage data, the charging rate data and the charging time data are extracted and processed to obtain the charging cut-off voltage data, the charging rate data and the charging time data, wherein the charging cut-off voltage refers to the highest voltage that the battery can reach when charging, and the charging time refers to the time required for the battery to reach the charging cut-off voltage from the beginning of charging, the test result record data of the constant current discharge test is obtained, and the discharge cut-off voltage data, the discharge rate data and the discharge time data are extracted and processed to obtain the discharge cut-off voltage data, the discharge rate data and the discharge time data, wherein the discharge cut-off voltage refers to the lowest voltage that the battery can reach when discharging, and the discharge time refers to the time required for the battery to reach the discharge cut-off voltage from the beginning of discharging, and finally, the battery capacity steady-state index is obtained according to the charging cut-off voltage data, the charging rate data and the charging time data, combined with the discharge cut-off voltage data, the discharge rate data and the discharge time data; Wherein, the calculation formula of the battery capacity steady-state index is: ; in, is the battery capacity steady-state index, , , They are charging cut-off voltage data, charging rate data, and charging time data. , , They are discharge cut-off voltage data, discharge rate data, and discharge time data. , , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0039] According to an embodiment of the present invention, the charging and discharging voltage curve test is performed on the target solid-state battery, and the battery polarization change index is obtained according to the charging and discharging voltage curve test result, including: Performing a charge and discharge voltage curve test on the target solid-state battery, including a charge voltage curve test and a discharge voltage curve test; Obtaining test result record data of the charging voltage curve test, and extracting and processing to obtain charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data; Acquire the test result record data of the discharge voltage curve test, and extract and process to obtain discharge platform height data, discharge platform length data, discharge polarization voltage data and discharge voltage change rate data; The battery polarization variation index is obtained by processing the charging platform height data, the charging platform length data, the charging polarization voltage data and the charging voltage change rate data in combination with the discharge platform height data, the discharge platform length data, the discharge polarization voltage data and the discharge voltage change rate data.

[0040] It should be noted that during the charge and discharge process, the battery voltage change curve over time or capacity is recorded, and the battery polarization state is obtained through processing. Therefore, the test result record data of the charging voltage curve test is obtained, and the charging platform height, charging platform length, charging polarization voltage and charging voltage change rate data are extracted and processed. Among them, during the charging process, the solid-state battery will have a stage where the voltage is relatively stable. The voltage value in this stage is the charging platform height. The charging platform length refers to the duration of the voltage platform in the entire charging curve. During the charging process, due to the internal resistance and electrochemical polarization of the battery, the actual voltage of the battery will be higher than the theoretical voltage in its equilibrium state. This excess voltage The voltage part is the charge polarization voltage. The test result record data of the discharge voltage curve test is obtained, and the discharge platform height, discharge platform length, discharge polarization voltage and discharge voltage change rate data are extracted and processed. Among them, during the discharge process, the solid-state battery will have a relatively stable voltage stage. The voltage value of this stage is the discharge platform height. The discharge platform length refers to the duration of the voltage platform in the entire discharge curve. During the discharge process, due to the internal resistance and electrochemical polarization of the battery, the actual voltage of the battery will be lower than the theoretical voltage in its equilibrium state. This low voltage part is the discharge polarization voltage. Finally, the above data is processed to obtain the battery polarization change index; Wherein, the calculation formula of the battery polarization change index is: ; in, is the battery polarization variation index, , , , They are charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data. , , , They are the discharge platform height data, discharge platform length data, discharge polarization voltage data, and discharge voltage change rate data. , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0041] According to an embodiment of the present invention, performing an AC impedance method internal resistance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance method internal resistance test result, includes: Performing an AC impedance test on the target solid-state battery and obtaining AC impedance test result record data; Extract and process the recorded data of the internal resistance test result of the AC impedance method to obtain high-frequency area data, medium-frequency area data and low-frequency area data; The high frequency region data includes ohmic internal resistance data; The intermediate frequency region data includes charge transfer resistance data and double layer capacitance data; The low-frequency region data includes diffusion resistance data and inductance data; The ohmic internal resistance data, the charge transfer resistance data and the double-layer capacitance data are processed in combination with the diffusion resistance data and the inductance data to obtain a battery internal resistance characteristic index.

[0042] It should be noted that the AC impedance method internal resistance test refers to applying a small amplitude AC signal (the frequency range is usually from a few hertz to hundreds of kilohertz) to the solid-state battery, and measuring the voltage response and input current at both ends of the battery. By calculating the complex ratio of voltage to current, the AC impedance spectrum of the battery can be obtained. In the high-frequency region of the AC impedance spectrum, the impedance mainly reflects the ohmic internal resistance of the solid-state battery. The impedance in the medium-frequency region is closely related to the charge transfer process on the surface of the battery electrode. The corresponding characteristic data are the charge transfer resistance and the double-layer capacitance data. The impedance in the low-frequency region is mainly related to the diffusion process of lithium ions inside the solid-state battery. The corresponding characteristic data are the diffusion resistance (also known as Warburg impedance) and inductance data. Finally, the above data are processed to obtain the battery internal resistance characteristic index; Wherein, the calculation formula of the battery internal resistance characteristic index is: ; in, is the battery internal resistance characteristic index, is the ohm internal resistance data, , They are charge transfer resistance data and double layer capacitance data respectively. , They are diffusion resistance data and inductance data respectively. , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0043] According to an embodiment of the present invention, performing a standard cycle life test on the target solid-state battery and obtaining a battery performance attenuation index according to the standard cycle life test result includes: Performing a standard cycle life test on the target solid-state battery and obtaining standard cycle life test result record data; Extract and process the recorded data of the standard cycle life test result to obtain capacity decay rate data, internal resistance growth rate data and energy density decay rate data; The battery performance attenuation index is obtained by processing the capacity attenuation rate data, the internal resistance growth rate data, and the energy density attenuation rate data.

[0044] It should be noted that the standard cycle life test refers to multiple cycles of charging and discharging of solid-state batteries under specified charging and discharging conditions (such as temperature, current rate, voltage range, etc.). For example, at 25°C, charge to 4.2V at a rate of 0.5C, and then discharge to 3.0V at a rate of 0.5C. This process is repeated, and the capacity, internal resistance, voltage and other data after each cycle are recorded, and then extracted and processed to obtain the capacity decay rate, internal resistance growth rate and energy density decay rate data, and then processed according to the above data to obtain the battery performance decay index; The calculation formula of the battery performance attenuation index is: ; in, is the battery performance attenuation index, , , They are capacity attenuation rate data, internal resistance growth rate data, and energy density attenuation rate data. , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0045] According to an embodiment of the present invention, the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index are processed in combination with the battery thermal stability index to obtain a battery performance comprehensive evaluation index, and the target solid-state battery is subjected to performance qualification determination and corresponding improvement measures are taken, including: According to the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index, the battery thermal stability index is processed by a preset battery performance detection model to obtain a battery performance comprehensive evaluation index; Comparing the battery performance comprehensive evaluation index with a preset battery performance comprehensive evaluation threshold to obtain a threshold comparison result; Performing performance qualification determination on the target solid-state battery according to the threshold comparison result; If the performance of the target solid-state battery is unsatisfactory, corresponding improvement measures are taken.

[0046] It should be noted that the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index obtained by processing are combined with the battery thermal stability index through the calculation formula of the preset battery performance detection model to obtain the battery performance comprehensive evaluation index, and then compared with the preset battery performance comprehensive evaluation threshold to obtain the threshold comparison result, and the performance qualification of the target solid-state battery is determined according to the threshold comparison result. If the threshold comparison result is not within the threshold range, the performance of the target solid-state battery is unqualified, and corresponding improvement measures are taken; Wherein, the calculation formula of the comprehensive evaluation index of battery performance is: ; in, is the comprehensive evaluation index of battery performance, , , , , They are battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index, battery performance attenuation index, and battery thermal stability index. , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0047] According to an embodiment of the present invention, it also includes: The step of performing a thermal stability test on the target solid-state battery and obtaining a battery thermal stability index according to the thermal stability test result specifically includes: Performing a thermal stability test on the target solid-state battery and obtaining record data of the thermal stability test results; Extract and process the recorded data of the thermal stability test results to obtain the starting thermal runaway temperature data, the heating rate data, the cooling rate data and the maximum internal resistance data; Processing the starting thermal runaway temperature data, the heating rate data, the cooling rate data, and the maximum internal resistance data to obtain a battery thermal stability index; Wherein, the calculation formula of the battery thermal stability index is: ; in, is the battery thermal stability index, , , , They are the starting thermal runaway temperature data, heating rate data, cooling rate data, and maximum internal resistance data. , , , It is a preset characteristic coefficient (the characteristic coefficient is obtained by querying a preset solid-state battery performance database).

[0048] It should be noted that the thermal stability test refers to placing the solid-state battery in a specific hot box, raising the temperature at a certain heating rate (such as 5°C / min), and monitoring the temperature, pressure, voltage and other data inside the battery. The data is then extracted and processed to obtain the starting thermal runaway temperature, heating rate, cooling rate and maximum internal resistance data. The starting thermal runaway temperature is the temperature at which the solid-state battery begins to experience thermal runaway during the thermal stability test. The data is then processed based on the above data to obtain the battery thermal stability index.

[0049] The solid-state battery performance testing method and system based on data analysis disclosed in the present invention perform constant current charge and discharge tests on a target solid-state battery, obtain a battery capacity steady-state index according to the constant current charge and discharge test results, perform charge and discharge voltage curve tests on the target solid-state battery, obtain a battery polarization change index according to the charge and discharge voltage curve test results, perform an AC impedance internal resistance test on the target solid-state battery, obtain a battery internal resistance characteristic index according to the AC impedance internal resistance test results, perform a standard cycle life test on the target solid-state battery, obtain a battery performance attenuation index according to the standard cycle life test results, perform a thermal stability test on the target solid-state battery, obtain a battery thermal stability index according to the thermal stability test results, perform processing according to the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index in combination with the battery thermal stability index, obtain a battery performance comprehensive evaluation index, perform performance qualification judgment on the target solid-state battery and take corresponding improvement measures, thereby realizing the technology of solid-state battery performance testing based on data analysis.

[0050] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0051] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0052] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0053] Those skilled in the art can understand that: all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions, the aforementioned program can be stored in a readable storage medium, and when the program is executed, it executes the steps of the above method embodiments; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), disks or optical disks, and other media that can store program codes.

[0054] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

Claims

1. A solid-state battery performance testing method based on data analysis, characterized in that: The following steps are involved: Perform constant current charge and discharge test on the target solid-state battery, and obtain the battery capacity steady-state index according to the constant current charge and discharge test result; Performing a charge-discharge voltage curve test on the target solid-state battery, and obtaining a battery polarization change index according to the charge-discharge voltage curve test result; Performing an AC impedance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance test result; Performing a standard cycle life test on the target solid-state battery, and obtaining a battery performance attenuation index according to the standard cycle life test result; Performing a thermal stability test on the target solid-state battery, and obtaining a battery thermal stability index according to the thermal stability test result; According to the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index, combined with the battery thermal stability index, a battery performance comprehensive evaluation index is obtained, and the performance qualification of the target solid-state battery is determined and corresponding improvement measures are taken.

2. The solid-state battery performance testing method based on data analysis according to claim 1, characterized in that: The constant current charge and discharge test is performed on the target solid-state battery, and the battery capacity steady-state index is obtained according to the constant current charge and discharge test result, including: Perform constant current charge and discharge tests on the target solid-state battery, including constant current charge test and constant current discharge test; Acquire the test result record data of the constant current charging test, and extract and process to obtain charging cut-off voltage data, charging rate data and charging time data; Acquire the test result record data of the constant current discharge test, and extract and process to obtain discharge cut-off voltage data, discharge rate data and discharge time data; The battery capacity steady-state index is obtained by processing the charge cut-off voltage data, the charge rate data and the charge time data in combination with the discharge cut-off voltage data, the discharge rate data and the discharge time data.

3. The solid-state battery performance testing method based on data analysis according to claim 2, characterized in that: The charging and discharging voltage curve test is performed on the target solid-state battery, and the battery polarization change index is obtained according to the charging and discharging voltage curve test result, including: Performing a charge and discharge voltage curve test on the target solid-state battery, including a charge voltage curve test and a discharge voltage curve test; Obtaining test result record data of the charging voltage curve test, and extracting and processing to obtain charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data; Acquire the test result record data of the discharge voltage curve test, and extract and process to obtain discharge platform height data, discharge platform length data, discharge polarization voltage data and discharge voltage change rate data; The battery polarization variation index is obtained by processing the charging platform height data, the charging platform length data, the charging polarization voltage data and the charging voltage change rate data in combination with the discharge platform height data, the discharge platform length data, the discharge polarization voltage data and the discharge voltage change rate data.

4. The solid-state battery performance testing method based on data analysis according to claim 3 is characterized in that: The step of performing an AC impedance method internal resistance test on the target solid-state battery and obtaining a battery internal resistance characteristic index according to the AC impedance method internal resistance test result includes: Performing an AC impedance test on the target solid-state battery and obtaining AC impedance test result record data; Extract and process the recorded data of the internal resistance test result of the AC impedance method to obtain high-frequency area data, medium-frequency area data and low-frequency area data; The high frequency region data includes ohmic internal resistance data; The intermediate frequency region data includes charge transfer resistance data and double layer capacitance data; The low-frequency region data includes diffusion resistance data and inductance data; The ohmic internal resistance data, the charge transfer resistance data and the double-layer capacitance data are processed in combination with the diffusion resistance data and the inductance data to obtain a battery internal resistance characteristic index.

5. The solid-state battery performance testing method based on data analysis according to claim 4 is characterized in that: The step of performing a standard cycle life test on the target solid-state battery and obtaining a battery performance attenuation index according to the standard cycle life test result includes: Performing a standard cycle life test on the target solid-state battery and obtaining standard cycle life test result record data; Extract and process the recorded data of the standard cycle life test result to obtain capacity decay rate data, internal resistance growth rate data and energy density decay rate data; The battery performance attenuation index is obtained by processing the capacity attenuation rate data, the internal resistance growth rate data, and the energy density attenuation rate data.

6. The solid-state battery performance testing method based on data analysis according to claim 5, characterized in that: The battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index are processed in combination with the battery thermal stability index to obtain a battery performance comprehensive evaluation index, and the target solid-state battery is subjected to performance qualification determination and corresponding improvement measures are taken, including: According to the battery capacity steady-state index, the battery polarization change index, the battery internal resistance characteristic index and the battery performance attenuation index, the battery thermal stability index is processed by a preset battery performance detection model to obtain a battery performance comprehensive evaluation index; Comparing the battery performance comprehensive evaluation index with a preset battery performance comprehensive evaluation threshold to obtain a threshold comparison result; Performing performance qualification determination on the target solid-state battery according to the threshold comparison result; If the performance of the target solid-state battery is unsatisfactory, corresponding improvement measures are taken.

7. A solid-state battery performance testing system based on data analysis, characterized in that: The system includes: a memory and a processor, wherein the memory includes a program of a solid-state battery performance test method based on data analysis, and when the program of the solid-state battery performance test method based on data analysis is executed by the processor, the following steps are implemented: Perform constant current charge and discharge test on the target solid-state battery, and obtain the battery capacity steady-state index according to the constant current charge and discharge test result; Performing a charge-discharge voltage curve test on the target solid-state battery, and obtaining a battery polarization change index according to the charge-discharge voltage curve test result; Performing an AC impedance test on the target solid-state battery, and obtaining a battery internal resistance characteristic index according to the AC impedance test result; Performing a standard cycle life test on the target solid-state battery, and obtaining a battery performance attenuation index according to the standard cycle life test result; Performing a thermal stability test on the target solid-state battery, and obtaining a battery thermal stability index according to the thermal stability test result; According to the battery capacity steady-state index, battery polarization change index, battery internal resistance characteristic index and battery performance attenuation index, combined with the battery thermal stability index, a battery performance comprehensive evaluation index is obtained, and the performance qualification of the target solid-state battery is determined and corresponding improvement measures are taken.

8. The solid-state battery performance testing system based on data analysis according to claim 7, characterized in that: The constant current charge and discharge test is performed on the target solid-state battery, and the battery capacity steady-state index is obtained according to the constant current charge and discharge test result, including: Perform constant current charge and discharge tests on the target solid-state battery, including constant current charge test and constant current discharge test; Acquire the test result record data of the constant current charging test, and extract and process to obtain charging cut-off voltage data, charging rate data and charging time data; Acquire the test result record data of the constant current discharge test, and extract and process to obtain discharge cut-off voltage data, discharge rate data and discharge time data; The battery capacity steady-state index is obtained by processing the charge cut-off voltage data, the charge rate data and the charge time data in combination with the discharge cut-off voltage data, the discharge rate data and the discharge time data.

9. The solid-state battery performance testing system based on data analysis according to claim 8, characterized in that: The charging and discharging voltage curve test is performed on the target solid-state battery, and the battery polarization change index is obtained according to the charging and discharging voltage curve test result, including: Performing a charge and discharge voltage curve test on the target solid-state battery, including a charge voltage curve test and a discharge voltage curve test; Obtaining test result record data of the charging voltage curve test, and extracting and processing to obtain charging platform height data, charging platform length data, charging polarization voltage data, and charging voltage change rate data; Acquire the test result record data of the discharge voltage curve test, and extract and process to obtain discharge platform height data, discharge platform length data, discharge polarization voltage data and discharge voltage change rate data; The battery polarization variation index is obtained by processing the charging platform height data, the charging platform length data, the charging polarization voltage data and the charging voltage change rate data in combination with the discharge platform height data, the discharge platform length data, the discharge polarization voltage data and the discharge voltage change rate data.

10. The solid-state battery performance testing system based on data analysis according to claim 9, characterized in that: The step of performing an AC impedance method internal resistance test on the target solid-state battery and obtaining a battery internal resistance characteristic index according to the AC impedance method internal resistance test result includes: Performing an AC impedance test on the target solid-state battery and obtaining AC impedance test result record data; Extract and process the recorded data of the internal resistance test result of the AC impedance method to obtain high-frequency area data, medium-frequency area data and low-frequency area data; The high frequency region data includes ohmic internal resistance data; The intermediate frequency region data includes charge transfer resistance data and double layer capacitance data; The low-frequency region data includes diffusion resistance data and inductance data; The ohmic internal resistance data, the charge transfer resistance data and the double-layer capacitance data are processed in combination with the diffusion resistance data and the inductance data to obtain a battery internal resistance characteristic index.

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