Comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries

Abstract

This invention discloses a comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries. This invention relates to the field of battery performance evaluation technology and solves the technical problem of the difficulty in forming a unified and scientific evaluation system, which prevents the provision of comprehensive and effective data support and decision-making basis for battery research and development, production, use, and recycling. This invention constructs a complete comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries, covering all stages such as production, use, and recycling. It achieves a systematic evaluation of battery performance throughout the entire process, helping to comprehensively understand the battery's performance at different stages. Clear evaluation indicators and methods are established for each stage. Through unified quantitative processing and standard matching, the scattered evaluation indicators are integrated into an organic whole, improving the scientific rigor and comparability of the evaluation results and facilitating the analysis and comparison of data from different stages.

Description

Technical Field

[0001] This invention relates to the field of battery performance evaluation technology, specifically a comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries. Background Technology

[0002] Lithium-ion batteries, with their advantages of high energy density and long cycle life, are widely used in electric vehicles, energy storage systems, and portable electronic devices. As the demand for lithium-ion batteries continues to grow, a comprehensive and accurate evaluation of their performance throughout their entire lifecycle is becoming increasingly important.

[0003] According to patent application CN113631936B, a battery performance evaluation method and a battery performance evaluation device are disclosed, which can improve the accuracy of battery performance evaluation of secondary batteries. Based on the measurement results of the complex impedance Z of the first secondary battery (221), the values ​​of the parameters of the secondary battery model are identified (determined). The secondary battery model reflects the impedance of the internal resistance of the first secondary battery (221) by representing the transfer functions of the IIR system and the FIR system, respectively. In addition, based on the comparison results of the voltage response characteristic V(t) output from the second secondary battery (222) when a pulse current I(t) is input to the secondary battery (220) as the second secondary battery (222), and the model voltage response characteristic Vmodel(t) of the secondary battery model whose parameter values ​​have been identified when the pulse current is input, the performance of the second secondary battery (222) is evaluated.

[0004] However, existing battery performance evaluation methods typically focus only on a specific stage of the battery lifecycle, lacking a systematic evaluation of the entire process, including production, use, and recycling. Furthermore, the evaluation indicators and methods for each stage are fragmented, making it difficult to form a unified and scientific evaluation system. This results in a failure to provide comprehensive and effective data support and decision-making basis for battery research and development, production, use, and recycling. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries. This system solves the problem of the difficulty in forming a unified and scientific evaluation system, which makes it impossible to provide comprehensive and effective data support and decision-making basis for battery research and development, production, use, and recycling.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries, comprising: The production stage evaluation and analysis module is used to quantify the battery initial capacity, battery content and battery charge and discharge efficiency in the production stage data transmitted by the battery cycle data acquisition module to obtain the corresponding quantitative indicators, and then sum them to obtain the production stage evaluation indicators. At the same time, it performs numerical processing to obtain the production stage evaluation score, and then transmits it to the comprehensive evaluation and analysis module. The usage stage evaluation and analysis module is used to quantify the operating voltage, current and operating temperature in the usage stage data transmitted by the battery cycle data acquisition module to obtain the corresponding quantitative indicators, and sum them to obtain the usage stage evaluation indicators. At the same time, it is numerically processed to obtain the usage stage evaluation score, and then transmitted to the comprehensive evaluation and analysis module. The recycling stage evaluation and analysis module is used to quantify the recycling process parameters, valuable metal recovery rate and material properties in the recycling stage data transmitted by the battery cycle data acquisition module to obtain the corresponding quantitative indicators. The three are then summed to obtain the recycling stage evaluation index, and numerical processing is performed to obtain the recycling stage evaluation score. Finally, the score is transmitted to the comprehensive evaluation and analysis module. The comprehensive evaluation and analysis module is used to sum the evaluation scores of the production stage, the usage stage, and the recycling stage, calculate the mean, compare the obtained mean with the evaluation indicators, generate evaluation information, and transmit it to the evaluation information output module.

[0007] As a further aspect of the present invention, it also includes a battery cycle data acquisition module for collecting stage data of each stage of the lithium-ion battery life cycle and transmitting them to the corresponding stage data analysis module, wherein the stage data includes production stage data, usage stage data and recycling stage data. The evaluation information output module is used to display the acquired evaluation information to the corresponding operators.

[0008] As a further aspect of the present invention, the production stage evaluation and analysis module quantifies the initial battery capacity, battery contents, and battery charge / discharge efficiency to obtain the quantified indicators in the following specific manner: The initial capacity of the battery is quantified and charged according to the battery manufacturing standard. A combination of constant current and constant voltage is often used. First, the battery is charged at a constant current of 0.5C until the battery voltage reaches 4.2V, then it is switched to constant voltage charging. The charging ends when the charging current drops to 0.05C. Subsequently, the battery is discharged using a constant current, connected to a load, and the discharge current I is set. 放 Continue discharging until the battery voltage drops to the specified discharge cutoff voltage, record the discharge time t, and use the formula Q=I 放The initial capacity Q of the battery is calculated by ×t. Multiple charge and discharge tests are performed on the battery to calculate the average capacity. Based on the battery application scenarios and requirements, a capacity evaluation standard is formulated. The average value is compared with the standard to obtain the initial capacity index. The battery's internal resistance was quantified. The battery was first fully charged, then discharged at a constant current. The battery terminal voltage was measured at the start of discharge and during the steady-state discharge phase, and the voltage change was calculated. Simultaneously, the discharge current I was recorded. 放 Substitute the obtained parameters into the formula Calculate the battery internal resistance R, formulate an internal resistance evaluation standard based on the battery application scenario and requirements, compare the calculated internal resistance with the standard, and obtain the internal resistance index. The battery charge and discharge efficiency is quantified according to the formula. Calculate the battery charging efficiency Q 充入 Q is the actual amount of electricity received and stored by the battery. 充电器输出 It is the total amount of electricity output from the charger to the battery, then according to the formula The battery discharge efficiency was calculated. Q 放出 Q is the actual amount of electricity released by the battery during discharge. 充入 It is the amount of electricity stored in the battery after it has been charged; Based on the application scenarios and requirements of the battery, corresponding efficiency evaluation standards are formulated, and the calculated charge and discharge efficiencies are matched with the efficiency evaluation standards to obtain charging and discharging indicators.

[0009] As a further aspect of the present invention, the specific method by which the production stage evaluation and analysis module generates the production stage evaluation score is as follows: Substitute the obtained initial capacity index, internal resistance index, charging index, and discharging index into the formula. The evaluation index L1 for the battery production stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score.

[0010] As a further aspect of the present invention, the specific method by which the usage stage evaluation and analysis module quantifies the operating voltage, current, and operating temperature to obtain the corresponding quantitative indicators is as follows: The operating voltage and current are quantified to obtain the actual operating voltage V and the nominal voltage V of the battery. nom And according to the formula The voltage deviation is calculated by comparing the difference between the two values. Based on the battery application scenario and requirements, a voltage deviation evaluation standard is formulated, and the calculated voltage deviation is matched with it to obtain the voltage deviation index. Using the same method, the operating current is analyzed, the current deviation is calculated, and the evaluation standard is matched to obtain the current deviation index. The battery operating temperature was quantified, and two adjacent temperature measurement points T were selected. i and T i+1 and the corresponding time interval Through formula The rate of temperature change is calculated, then the rate over multiple time periods is calculated, and the average rate of temperature change is calculated. At the same time, according to the application scenario and requirements of the battery, a corresponding evaluation standard for the rate of temperature change is formulated. The average rate of temperature change is then matched with the corresponding evaluation standard to obtain the temperature change index.

[0011] As a further aspect of the present invention, the specific method by which the usage stage evaluation and analysis module obtains the usage stage evaluation score is as follows: Substitute the obtained voltage deviation index, current deviation index, and temperature change index into the formula. The evaluation index L2 for the battery usage stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score. At the same time, the evaluation score for the usage stage is transmitted to the comprehensive evaluation and analysis module.

[0012] As a further aspect of the present invention, the recycling stage evaluation and analysis module quantifies the recycling process parameters, valuable metal recovery rate, and material properties to obtain the corresponding quantitative indicators in the following specific manner: The recycling process parameters are quantified. During the main reaction process, the temperature inside the reaction vessel is monitored in real time by a temperature sensor. The average temperature is calculated. Based on the battery application scenarios and requirements, a reaction temperature evaluation standard is formulated, and the average temperature is matched with it to obtain the reaction temperature index. The recovery rate of valuable metals is quantified, all valuable metals are identified, the content of each metal in the materials before and after recovery is analyzed, the recovery rate is calculated, and the total recovery rate is obtained. Based on the battery application scenarios and requirements, a recovery rate evaluation standard is formulated, and the total recovery rate is matched with it to obtain the recovery rate index. The material properties are quantified by using a laser particle size analyzer to analyze the particle size of the processed material, obtain particle size distribution data, calculate the average value, formulate material performance evaluation standards based on battery application scenarios and requirements, match the average value with the standards, and obtain material performance indicators.

[0013] As a further aspect of the present invention, the specific method by which the recycling stage evaluation module obtains the recycling stage assessment score is as follows: Next, the obtained reaction temperature, recovery rate, and material performance indicators are substituted into the formula. The evaluation index L3 corresponding to the recycling stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score.

[0014] As a further aspect of the present invention, the comprehensive evaluation and analysis module generates the evaluation information in the following specific manner: The battery evaluation score is obtained by summing the evaluation scores from the production stage, the usage stage, and the recycling stage, and calculating the average value. The battery evaluation score is then compared with the corresponding evaluation standards to obtain the corresponding evaluation information.

[0015] This invention provides a comprehensive performance evaluation system for lithium-ion batteries throughout their entire life cycle. Compared with existing technologies, it has the following advantages: This invention constructs a complete comprehensive performance evaluation system for lithium-ion batteries throughout their entire life cycle, covering all stages including production, use, and recycling. It enables a systematic evaluation of the battery's performance throughout the entire process, facilitating a comprehensive understanding of the battery's performance at different stages. Clear evaluation indicators and methods are established for each stage. Through unified quantitative processing and standard matching, the scattered evaluation indicators are integrated into an organic whole, improving the scientific rigor and comparability of the evaluation results and facilitating the analysis and comparison of data from different stages.

[0016] This invention comprehensively processes the evaluation scores at each stage through a comprehensive evaluation and analysis module, providing a complete and accurate basis for decision-making in all aspects of the battery industry. In the production stage, it helps companies optimize production processes and improve product quality; in the usage stage, it helps users use batteries rationally and extend battery life; and in the recycling stage, it encourages recycling companies to improve recycling technologies and increase resource utilization, thereby promoting the sustainable development of the entire battery industry. Attached Figure Description

[0017] Figure 1 This is a block diagram illustrating the system principle of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 This application provides a comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries, including a battery cycle data acquisition module, a production stage evaluation and analysis module, a usage stage evaluation and analysis module, a recycling stage evaluation and analysis module, a comprehensive evaluation and analysis module, and an evaluation information output module, and in conjunction with... Figure 1 It can be seen that the above functional modules are connected electrically in one direction.

[0020] The battery cycle data acquisition module is used to collect stage data for each stage of the lithium-ion battery life cycle and transmit them to the corresponding stage data analysis modules. Specifically, the stage data includes production stage data, usage stage data, and recycling stage data, which are then transmitted to the production stage evaluation and analysis module, usage stage evaluation and analysis module, and recycling stage evaluation and analysis module, respectively.

[0021] The production stage evaluation and analysis module is used to analyze the acquired production stage data, which includes the battery's initial capacity, battery internal resistance, and battery charge and discharge efficiency. The specific method for analyzing the initial capacity of a battery is as follows: Charge the battery according to the standard charging method specified by the battery manufacturer. Usually, a combination of constant current charging and constant voltage charging is used. For example, first charge the battery with a constant current (such as 0.5C, where C is the rated capacity of the battery). When the battery voltage reaches the specified charging cutoff voltage (such as 4.2V), switch to constant voltage charging until the charging current drops to the specified cutoff current (such as 0.05C), which is considered the end of charging. Next, a constant current discharge method is used. The battery is connected to the load and discharged with a certain discharge current (such as 1C) until the battery voltage drops to the specified discharge cutoff voltage (such as 2.75V). During the discharge process, the discharge time t is obtained. According to the discharge current I 放 And the discharge time t, using the formula Q=I 放 The initial capacity Q of the battery is calculated by multiplying the current by t, and the unit is ampere-hour (Ah) or milliampere-hour (mAh). For example, if the discharge current is 1A and the discharge time is 5 hours, then the initial capacity of the battery is 1x5=5Ah. At the same time, the battery is tested by multiple charge and discharge cycles, generally 3-5 cycles. Each cycle is operated according to the standard charge and discharge test method. The initial capacity data of the battery obtained from multiple tests are statistically analyzed, and the average value of the initial capacity of the battery is calculated. The average value can reflect the overall level of the initial capacity of the battery. According to the application scenario and requirements of the battery, the corresponding capacity evaluation standard is formulated. The capacity evaluation standard here is specifically expressed as the evaluation index corresponding to the initial capacity range of the battery. The calculated average value is matched with the capacity evaluation standard to obtain the initial capacity index. The specific method for analyzing the battery's internal resistance is as follows: fully charge the battery, then discharge it with a constant current. Measure the battery's terminal voltage at the instant the discharge begins and after a period of stable discharge, and calculate the voltage change. Simultaneously record the discharge current I 放 And the discharge current I here 放 Compared with the initial capacity of the battery mentioned above, I 放 The same applies, and the obtained parameters are substituted into the formula. The battery internal resistance R is calculated. Based on the battery's application scenarios and requirements, a corresponding internal resistance evaluation standard is formulated. The internal resistance evaluation standard here is specifically expressed as the evaluation index corresponding to the battery's internal resistance range. The calculated internal resistance is matched with the internal resistance evaluation standard to obtain the internal resistance index. The specific method for analyzing battery charge and discharge efficiency is as follows: based on the formula Calculate the battery charging efficiency Q 充入 Q is the actual amount of electricity received and stored by the battery. 充电器输出 It is the total amount of electricity output from the charger to the battery, then according to the formula The battery discharge efficiency was calculated. Q 放出 Q is the actual amount of electricity released by the battery during discharge. 充入 It is the amount of electricity stored in the battery after it has been charged; Based on the application scenarios and requirements of the battery, corresponding efficiency evaluation standards are formulated. Here, efficiency is specifically expressed as the evaluation index corresponding to the charging and discharging efficiency range. The calculated charging and discharging efficiency is matched with the efficiency evaluation standards to obtain charging index and discharging index. Next, substitute the obtained initial capacity, internal resistance, charging, and discharging parameters into the formula. The evaluation index L1 for the battery production stage is calculated, and the obtained evaluation index is numerically processed to obtain an evaluation score. Here, numerical processing means multiplying the evaluation index by 100 to get the corresponding value. For example, if the obtained evaluation index L1 for the battery production stage is 0.85, then the corresponding value of multiplying by 100 is 85. The obtained 85 is used as the evaluation score for the production stage. At the same time, the obtained evaluation score for the production stage is transmitted to the comprehensive evaluation and analysis module.

[0022] The usage phase evaluation and analysis module is used to analyze the acquired usage phase data, which includes operating voltage, current and operating temperature. The specific method for analyzing and evaluating the operating voltage and current is to obtain the actual operating voltage and nominal voltage of the battery, and calculate the difference between the two to obtain the voltage deviation. The calculation formula is as follows: Where V is the actual measured operating voltage, V nom It is the nominal voltage of the battery. According to the application scenario and requirements of the battery, the corresponding voltage deviation evaluation standard is formulated, and the obtained voltage deviation is matched with the voltage deviation evaluation standard to obtain the voltage deviation index. Similarly, the current is analyzed to obtain the current deviation index. The specific method for analyzing and evaluating battery operating temperature is to select two adjacent temperature measurement points T. i and T i+1 and the corresponding time interval Through formula The rate of temperature change is calculated, then the rate of change is calculated for multiple time periods, and the average rate of temperature change is calculated. At the same time, according to the application scenario and requirements of the battery, the corresponding evaluation standard of temperature change rate is formulated. The average rate of temperature change rate is matched with the corresponding evaluation standard to obtain the temperature change index. Substitute the obtained voltage deviation index, current deviation index, and temperature change index into the formula. The evaluation index L2 for the battery usage stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score. The specific method of obtaining the evaluation score here is the same as the processing method corresponding to the production stage. At the same time, the evaluation score of the usage stage is transmitted to the comprehensive evaluation and analysis module. The recycling stage evaluation and analysis module is used to analyze the acquired recycling stage data, which includes recycling process parameters, valuable metal recovery rate, and material properties. The specific method for analyzing and evaluating the recycling process parameters is as follows: during the main reaction process of the recycling process, the temperature inside the reaction vessel is monitored in real time by a temperature sensor, and the average temperature during the entire reaction time is calculated. For example, for the acid leaching recycling process of lithium-ion battery cathode materials, if the temperature is recorded every 10 minutes during the 8-hour reaction time, and then the average value of these temperature data is calculated, it is the average reaction temperature. At the same time, according to the application scenario and requirements of the battery, the corresponding reaction temperature evaluation standard is formulated, and the obtained average temperature is matched with the reaction temperature evaluation standard to obtain the reaction temperature index. The specific method for analyzing and evaluating the recovery rate of valuable metals is to obtain all valuable metals (such as lithium, cobalt, nickel, manganese, etc.) and analyze the content of the metal in the material before and after recycling to calculate the recovery rate. Taking lithium as an example, assume that the total lithium content in the waste battery material before recycling is m. 1千克 After recycling, the lithium content in the lithium-containing product is m2 kg. The lithium recovery rate is m2 / m1×100%. The single metal recovery rate is a key indicator for measuring the recycling effect of the recycling process on a specific metal. Then, the recovery rates of all valuable metals are calculated and summed to obtain the total recovery rate. Then, according to the application scenario and requirements of the battery, the corresponding recovery rate evaluation standard is formulated. The obtained total recovery rate is matched with the recovery rate evaluation standard to obtain the recovery rate index. The specific method for analyzing and evaluating material properties is to use instruments such as a laser particle size analyzer to perform particle size analysis on the treated material, obtain particle size distribution data, and use the average particle size D 50 This represents the particle size characteristics of the material, and so on, to obtain the particle size of all materials. For example, the average particle size D of the processed cobalt powder. 50 =5 Based on the application scenarios and requirements of batteries, corresponding material performance evaluation standards are formulated, and the obtained particle size distribution data is matched with the evaluation standards. The particle size distribution data here is the average particle size distribution of all materials to obtain material performance indicators. Next, the obtained reaction temperature, recovery rate, and material performance indicators are substituted into the formula. The evaluation index L3 corresponding to the recycling stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score. The specific method of obtaining the evaluation score here is the same as the processing method corresponding to the production stage. At the same time, the evaluation score of the recycling stage is transmitted to the comprehensive evaluation and analysis module.

[0023] The comprehensive evaluation and analysis module is used to comprehensively process the evaluation scores obtained from the production stage, usage stage, and recycling stage. It sums the evaluation scores from different stages and calculates the average to obtain the battery evaluation score. Then, it compares the obtained battery evaluation score with the corresponding evaluation standard, which is a range of values ​​obtained through market research, to obtain the corresponding evaluation information. At the same time, it transmits the corresponding evaluation information to the evaluation information output module.

[0024] The evaluation information output module is used to display the acquired evaluation information to the corresponding operators.

[0025] The data in the above formulas are all calculated using numerical values, without substituting the units of the parameters. In addition, the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0026] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries, characterized in that, include: The production stage evaluation and analysis module is used to quantify the battery initial capacity, battery content and battery charge and discharge efficiency in the production stage data transmitted by the battery cycle data acquisition module to obtain the corresponding quantitative indicators, and then sum them to obtain the production stage evaluation indicators. At the same time, it performs numerical processing to obtain the production stage evaluation score, and then transmits it to the comprehensive evaluation and analysis module. The usage stage evaluation and analysis module is used to quantify the operating voltage, current and operating temperature in the usage stage data transmitted by the battery cycle data acquisition module to obtain the corresponding quantitative indicators, and sum them to obtain the usage stage evaluation indicators. At the same time, it is numerically processed to obtain the usage stage evaluation score, and then transmitted to the comprehensive evaluation and analysis module. The recycling stage evaluation and analysis module is used to quantify the recycling process parameters, valuable metal recovery rate and material properties in the recycling stage data transmitted by the battery cycle data acquisition module to obtain the corresponding quantitative indicators. The three are then summed to obtain the recycling stage evaluation index, and numerical processing is performed to obtain the recycling stage evaluation score. Finally, the score is transmitted to the comprehensive evaluation and analysis module. The comprehensive evaluation and analysis module is used to sum the evaluation scores of the production stage, the usage stage, and the recycling stage, calculate the mean, compare the obtained mean with the evaluation indicators, generate evaluation information, and transmit it to the evaluation information output module.

2. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, It also includes a battery cycle data acquisition module for collecting stage data at each stage of the lithium-ion battery life cycle and transmitting it to the corresponding stage data analysis module. The stage data includes production stage data, usage stage data and recycling stage data. The evaluation information output module is used to display the acquired evaluation information to the corresponding operators.

3. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, The production stage evaluation and analysis module quantifies the battery's initial capacity, battery contents, and battery charge / discharge efficiency. The specific method for obtaining the quantified indicators is as follows: The initial capacity of the battery is quantified and charged according to the battery manufacturing standard. A combination of constant current and constant voltage is often used. First, the battery is charged at a constant current of 0.5C until the battery voltage reaches 4.2V, then it is switched to constant voltage charging. The charging ends when the charging current drops to 0.05C. Subsequently, the battery is discharged using a constant current, connected to a load, and the discharge current I is set. 放 Continue discharging until the battery voltage drops to the specified discharge cutoff voltage, record the discharge time t, and use the formula Q=I 放 The initial capacity Q of the battery is calculated by ×t. Multiple charge and discharge tests are performed on the battery to calculate the average capacity. Based on the battery application scenarios and requirements, a capacity evaluation standard is formulated. The average value is compared with the standard to obtain the initial capacity index. To quantify the battery's internal resistance, the battery was first fully charged, then discharged at a constant current. The battery terminal voltage was measured at the instant of discharge and during the steady-state discharge phase, and the voltage change was calculated. Simultaneously, the discharge current I was recorded. 放 Substitute the obtained parameters into the formula Calculate the battery internal resistance R, formulate an internal resistance evaluation standard based on the battery application scenario and requirements, compare the calculated internal resistance with the standard, and obtain the internal resistance index. The battery charge and discharge efficiency is quantified according to the formula. Calculate the battery charging efficiency Q 充入 Q is the actual amount of electricity received and stored by the battery. 充电器输出 It is the total amount of electricity output from the charger to the battery, then according to the formula The battery discharge efficiency was calculated. Q 放出 Q is the actual amount of electricity released by the battery during discharge. 充入 It is the amount of electricity stored in the battery after it has been charged; Based on the application scenarios and requirements of the battery, corresponding efficiency evaluation standards are formulated, and the calculated charge and discharge efficiencies are matched with the efficiency evaluation standards to obtain charging and discharging indicators.

4. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, The specific method by which the production stage evaluation and analysis module generates the production stage assessment score is as follows: Substitute the obtained initial capacity index, internal resistance index, charging index, and discharging index into the formula. The evaluation index L1 for the battery production stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score.

5. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, The usage phase evaluation and analysis module quantifies the operating voltage, current, and operating temperature to obtain the corresponding quantitative indicators in the following specific way: The operating voltage and current are quantified to obtain the actual operating voltage V and the nominal voltage V of the battery. nom And according to the formula The voltage deviation is calculated by comparing the difference between the two values. Based on the battery application scenario and requirements, a voltage deviation evaluation standard is formulated, and the calculated voltage deviation is matched with it to obtain the voltage deviation index. Using the same method, the operating current is analyzed, the current deviation is calculated, and the evaluation standard is matched to obtain the current deviation index. The battery operating temperature was quantified, and two adjacent temperature measurement points T were selected. i and T i+1 and the corresponding time interval Through formula The rate of temperature change is calculated, then the rate over multiple time periods is calculated, and the average rate of temperature change is calculated. At the same time, according to the application scenario and requirements of the battery, a corresponding evaluation standard for the rate of temperature change is formulated. The average rate of temperature change is then matched with the corresponding evaluation standard to obtain the temperature change index.

6. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, The specific method for obtaining the usage stage evaluation score using the stage evaluation analysis module is as follows: Substitute the obtained voltage deviation index, current deviation index, and temperature change index into the formula. The evaluation index L2 for the battery usage stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score. At the same time, the evaluation score for the usage stage is transmitted to the comprehensive evaluation and analysis module.

7. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, The evaluation and analysis module for the recycling stage quantifies the recycling process parameters, valuable metal recovery rate, and material properties, obtaining the corresponding quantitative indicators in the following specific way: The recycling process parameters are quantified. During the main reaction process, the temperature inside the reaction vessel is monitored in real time by a temperature sensor. The average temperature is calculated. Based on the battery application scenarios and requirements, a reaction temperature evaluation standard is formulated, and the average temperature is matched with it to obtain the reaction temperature index. The recovery rate of valuable metals is quantified, all valuable metals are identified, the content of each metal in the materials before and after recovery is analyzed, the recovery rate is calculated, and the total recovery rate is obtained. Based on the battery application scenarios and requirements, a recovery rate evaluation standard is formulated, and the total recovery rate is matched with it to obtain the recovery rate index. The material properties are quantified by using a laser particle size analyzer to analyze the particle size of the processed material, obtain particle size distribution data, calculate the average value, formulate material performance evaluation standards based on battery application scenarios and requirements, match the average value with the standards, and obtain material performance indicators.

8. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, The specific method by which the recycling phase evaluation module obtains the recycling phase assessment score is as follows: Next, the obtained reaction temperature, recovery rate, and material performance indicators are substituted into the formula. The evaluation index L3 corresponding to the recycling stage is calculated, and the obtained evaluation index is numerically processed to obtain the evaluation score.

9. The comprehensive performance evaluation system for the entire life cycle of lithium-ion batteries according to claim 1, characterized in that, The specific method by which the comprehensive evaluation and analysis module generates evaluation information is as follows: The battery evaluation score is obtained by summing the evaluation scores from the production stage, the usage stage, and the recycling stage, and calculating the average value. The battery evaluation score is then compared with the corresponding evaluation standards to obtain the corresponding evaluation information.

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