A durability performance testing system for recycled batteries of new energy vehicles

Abstract

The present invention relates to the field of battery testing technology, and in particular to a durability performance testing system for recycling batteries of new energy vehicles, comprising an information acquisition module, a performance detection module, an information integration module and a performance evaluation module, wherein the performance evaluation module is used to determine the preset recycling standard values ​​corresponding to each battery type to determine the battery recycling method in combination with the electric energy recovery parameter, determine the preset number of charge and discharge cycles according to the current actual capacity, determine the performance tendency parameter of the recycled battery according to the preset number of charge and discharge cycles and the current number of charge and discharge cycles to determine the performance tendency type, and evaluate the durability of the recycled battery according to the battery recycling method and the performance tendency type. The present invention can quickly evaluate the durability of the recycled battery and improve the accuracy of the durability evaluation, which is helpful to maximize the utilization of resources and promote the green and sustainable development of the new energy vehicle industry.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a durability performance testing system for recycled batteries of new energy vehicles. Background Art

[0002] New energy vehicle battery recycling technology is an important part of the development of the new energy industry. It not only helps to reduce resource waste and environmental pollution, but also meets the requirements of green and low-carbon circular development. When power batteries are actually recycled, important indicators need to be tested, especially durability testing, which is related to the subsequent treatment methods for recycled power batteries.

[0003] Chinese Patent Publication No. CN102736035A discloses a method and system for power battery durability testing, which belongs to the field of automobile testing. The method includes: obtaining the operating current data of the whole vehicle; performing a charge and discharge cycle in a preset manner according to the operating current data; when the initial capacity of the power battery is reduced to a preset capacity value, the durability of the power battery is obtained according to the number of charge and discharge cycles. The system includes a drum, a testing device, and a monitoring device. The invention obtains the operating current data of the whole vehicle, performs a charge and discharge cycle in a preset manner according to the operating current data, and when the initial capacity of the power battery is reduced to a preset capacity value, the durability of the power battery is obtained according to the number of charge and discharge cycles. It effectively simulates the actual operation of the whole vehicle to the maximum extent in the form of charge and discharge testing, so that in the process of testing the durability of the power battery, the durability test time is saved and the accuracy of the durability test is improved. It can be seen that the invention has the following problems:

[0004] The invention does not consider quickly determining the recycling value of the battery based on the comparison of the current actual data of the recycled battery with the factory data to determine its recycling method and evaluate durability. Summary of the invention

[0005] To this end, the present invention provides a durability performance testing system for recycled batteries of new energy vehicles, which is used to overcome the problem in the prior art that the recycling value of the battery is not considered to be quickly determined based on the comparison of the current actual data of the recycled battery with the factory data to determine its recycling method and evaluate the durability, thereby quickly evaluating the durability of the recycled battery and improving the accuracy of the durability evaluation.

[0006] To achieve the above object, the present invention provides a durability performance testing system for recycled batteries of new energy vehicles, comprising:

[0007] An information collection module, used to obtain the battery type and original factory data of the recycled battery, the battery type includes lithium iron phosphate battery and ternary lithium battery, and the original factory data includes original rated capacity, original cycle life, original self-discharge rate and original efficiency;

[0008] A performance detection module, used to determine the recycling data of the recycled battery, wherein the recycling data includes the current actual capacity, the current number of charge and discharge cycles, the current self-discharge rate and the current efficiency;

[0009] An information integration module, which is connected to the information acquisition module and the performance detection module respectively, and is used to determine the electric energy recovery parameters of the recycled battery according to the recycled use data and the original factory data;

[0010] A performance evaluation module, which is respectively connected to the information acquisition module, the performance detection module and the information integration module, is used to determine the preset value of the recycling standard corresponding to each battery type to determine the battery recycling method in combination with the electric energy recovery parameter, determine the preset number of charge and discharge cycles according to the current actual capacity, determine the performance tendency parameter of the recycled battery according to the preset number of charge and discharge cycles and the current number of charge and discharge cycles to determine the performance tendency type, and evaluate the durability of the recycled battery according to the battery recycling method and the performance tendency type.

[0011] Furthermore, the information integration module determines the electric energy recovery parameter of the recycled battery according to the recycling and use data and the original factory data, and the electric energy recovery parameter is calculated according to the following formula:

[0012] , where K is the energy recovery parameter, C is the current actual capacity, C0 is the original rated capacity, R is the current self-discharge rate, R0 is the original self-discharge rate, η is the current efficiency, η0 is the original efficiency, k1 is the capacity coefficient, k2 is the self-discharge coefficient, and k3 is the efficiency coefficient.

[0013] Further, the performance evaluation module determines a preset recycling standard value corresponding to each battery type according to the battery type of the recycled battery;

[0014] Among them, the preset value of the lithium iron phosphate recycling standard is less than or equal to the preset value of the ternary lithium recycling standard.

[0015] Furthermore, the performance evaluation module determines the battery recycling method according to the preset recycling standard value corresponding to the battery type in combination with the electric energy recycling parameter, wherein when the battery type of the recycled battery is lithium iron phosphate:

[0016] If the electric energy recovery parameter is greater than the preset value of the lithium iron phosphate recovery standard, the battery recovery method is determined to be cascade utilization;

[0017] If the electric energy recovery parameter is less than or equal to the preset value of the lithium iron phosphate recovery standard, the battery recovery method is determined to be recycling and disassembly.

[0018] Furthermore, the performance evaluation module determines the battery recycling method according to the preset recycling standard value corresponding to the battery type combined with the electric energy recovery parameter, wherein, when the battery type of the recycled battery is ternary lithium:

[0019] If the electric energy recovery parameter is greater than the preset value of the ternary lithium recovery standard, the battery recovery method is determined to be cascade utilization;

[0020] If the electric energy recovery parameter is less than or equal to the preset value of the ternary lithium recycling standard, the battery recycling method is determined to be recycling and disassembly.

[0021] Furthermore, the performance evaluation module determines a preset number of charge and discharge cycles according to the current actual capacity and the original cycle life, and the preset number of charge and discharge cycles is calculated according to the following formula:

[0022] , where N is the preset number of charge and discharge cycles, C1 is the original standard capacity, N0 is the number of charge and discharge cycles corresponding to the original standard capacity, k is the correction coefficient, and C is the current actual capacity;

[0023] The original standard capacity C1 and the number of charge and discharge cycles N0 corresponding to the original standard capacity are determined according to the original cycle life.

[0024] Furthermore, the performance evaluation module determines the performance tendency parameter of the recycled battery according to the ratio of the preset charge and discharge cycle number to the current charge and discharge cycle number.

[0025] Furthermore, the performance evaluation module determines the performance tendency type of the recycled battery according to the performance tendency parameter and the performance tendency reference value, including:

[0026] If the performance tendency parameter is greater than or equal to the performance tendency reference value, the performance tendency type is judged to be an abnormal tendency state;

[0027] If the performance tendency parameter is less than the performance tendency reference value, the performance tendency type is determined to be a normal tendency state.

[0028] Furthermore, the performance evaluation module determines the durability of the recycled battery according to the battery recycling method and the performance tendency type, including:

[0029] If the battery recycling method is cascade utilization and the performance tendency type is a normal tendency state, it is judged that the durability of the recycled battery meets the standard;

[0030] If the battery recycling method is cascade utilization but the performance tendency type is an abnormal tendency state, it is determined that the durability of the recycled battery does not meet the standard.

[0031] Furthermore, the information acquisition module is also used to obtain historical charge and discharge information of the recycled battery, the historical charge and discharge information includes the charging type of each charging, the charging type includes fast charging and slow charging, and the performance evaluation module determines the value of the correction coefficient according to the ratio of the number of charging times corresponding to each charging type and the current actual capacity.

[0032] Compared with the prior art, the beneficial effect of the present invention is that the durability performance test system for recycled batteries of new energy vehicles provided by the present invention realizes a comprehensive and accurate evaluation of recycled batteries by integrating four modules of information collection, performance detection, information integration and performance evaluation. The system obtains the historical charge and discharge information and types of batteries and the original factory data, providing a solid foundation for the evaluation; by actually detecting the current actual capacity, charge and discharge cycle number, self-discharge rate and efficiency and other key indicators of the battery, it can scientifically calculate the electric energy recovery parameters, and then combine the preset recycling standards to intelligently determine the battery recycling method (cascade utilization or recycling and disassembly); the system also predicts the preset charge and discharge cycle number of the battery according to the current actual capacity of the battery, and compares it with the current cycle number to determine the performance tendency type of the battery, and finally comprehensively evaluates the durability of the battery; the present invention not only improves the economy and environmental protection of battery recycling, but also promotes the sustainable development of the new energy vehicle industry, and contributes to the construction of a green ecology by optimizing resource utilization and reducing environmental pollution;

[0033] Furthermore, the present invention ensures that recycled batteries are optimally processed through durability evaluation and reasonable recycling decisions. For batteries with better performance, cascade utilization is selected to extend their service life; for batteries with poorer performance, recycling and disassembly are selected to extract valuable materials. This processing method not only improves the economy of battery recycling, but also reduces environmental pollution and waste of resources.

[0034] Furthermore, the information integration module makes the recycling value assessment of recycled batteries more scientific and comprehensive through the application of the power recovery parameter formula; in particular, the high ratio of the current actual capacity to the original rated capacity, the reduction of the self-discharge rate and the maintenance of efficiency all play a positive role in improving the power recovery parameters, thereby directly reflecting the high value of the recycled batteries.

[0035] Furthermore, when evaluating recycled batteries, the performance evaluation module fully considers the characteristics of different battery types, especially the differences in cycle life and recycling value between lithium iron phosphate and ternary lithium power batteries, and sets reasonable recycling standard preset values ​​for each battery type. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a connection diagram of a durability performance testing system for recycled batteries of new energy vehicles according to an embodiment of the present invention;

[0037] Figure 2 is a work flow chart of the performance evaluation module of an embodiment of the present invention;

[0038] Figure 3 This is a flow chart of evaluating the durability of recycled batteries by the performance evaluation module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0041] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] See also Figures 1 to 3 As shown, they are respectively a connection diagram of a durability performance test system for recycled batteries of new energy vehicles according to an embodiment of the present invention, a work flow diagram of a performance evaluation module according to an embodiment of the present invention, and a flow chart of the performance evaluation module evaluating the durability of recycled batteries according to an embodiment of the present invention. An embodiment of the present invention provides a durability performance test system for recycled batteries of new energy vehicles, comprising:

[0044] An information acquisition module is used to obtain the battery type and original factory data of the recycled battery, the battery types include lithium iron phosphate batteries and ternary lithium batteries, and the original factory data include original rated capacity, original cycle life (in the present invention, after several charge and discharge cycles, the capacity will drop to 80% or less of the original rated capacity, and this data will be provided when the battery leaves the factory), original self-discharge rate and original efficiency; it can be understood that through the information acquisition module, the system can fully obtain the historical charge and discharge information, battery type and original factory data of the recycled battery, which provides a solid foundation for subsequent performance evaluation and recycling decisions, and ensures the accuracy and scientificity of the evaluation;

[0045] A performance detection module is used to determine the recycling data of the recycled battery, wherein the recycling data includes the current actual capacity (the current actual capacity is a percentage of the original rated capacity in the present invention, expressed as a percentage; in one implementation, the current actual capacity is 55%, which means that the current actual capacity is 55% of the original rated capacity), the current number of charge and discharge cycles, the current self-discharge rate and the current efficiency; it can be understood that the performance detection module can detect the current actual capacity, the number of charge and discharge cycles, the self-discharge rate and the efficiency of the recycled battery and other key parameters, which directly reflect the actual use status and performance attenuation of the battery, and provide an important basis for evaluating the residual value and recycling potential of the battery;

[0046] An information integration module, which is connected to the information acquisition module and the performance detection module respectively, and is used to determine the electric energy recovery parameters of the recycled battery according to the recycled use data and the original factory data; it can be understood that the information integration module integrates the collected original data with the detected current data to calculate the electric energy recovery parameters to provide data support for subsequent recycling decisions;

[0047] The performance evaluation module is respectively connected to the information acquisition module, the performance detection module and the information integration module, and is used to determine the preset value of the recycling standard corresponding to each battery type to determine the battery recycling method (including cascade utilization and recycling and disassembly) in combination with the electric energy recovery parameter, determine the preset number of charge and discharge cycles according to the current actual capacity, determine the performance tendency parameter of the recycled battery according to the preset number of charge and discharge cycles and the current number of charge and discharge cycles to determine the performance tendency type, and evaluate the durability of the recycled battery according to the battery recycling method and the performance tendency type; it can be understood that the system scientifically determines the battery recycling method based on the battery recycling and use data and the original factory data, combined with the preset recycling standard. This data-based recycling decision-making method helps to maximize the utilization of resources and the sustainable development of the environment.

[0048] It can be understood that the self-discharge rate of a battery is the rate of decrease in battery capacity during storage, that is, the rate at which the battery loses capacity due to self-discharge when there is no load; the efficiency of a battery refers to the ratio of the capacity output during discharge to the capacity input during charging.

[0049] Specifically, the information integration module determines the electric energy recovery parameter of the recycled battery according to the recycling and use data and the original factory data, and the electric energy recovery parameter is calculated according to the following formula:

[0050] , where K is the energy recovery parameter, C is the current actual capacity, C0 is the original rated capacity, R is the current self-discharge rate, R0 is the original self-discharge rate, η is the current efficiency, η0 is the original efficiency, k1 is the capacity coefficient, k2 is the self-discharge coefficient, and k3 is the efficiency coefficient.

[0051] It is understandable that the current actual capacity, current self-discharge rate and current efficiency of the recycled battery of the new energy vehicle will reflect the recycling value of the recycled battery; among them, the larger the current actual capacity of the recycled battery, the smaller the current self-discharge rate and the higher the current efficiency, the larger the electric energy recovery parameter, which means the higher the recycling value of the recycled battery; therefore, in practice, the larger the ratio of the current actual capacity to the original rated capacity, the larger the ratio of the original self-discharge rate to the current self-discharge rate and the larger the ratio of the current efficiency to the original efficiency, the higher the recycling value of the recycled battery.

[0052] It can be understood that C≤C0, R0≤R, η≤η0; k1+k2+k3=1, and among the factors affecting the recycling value of the recycled battery (electric energy recovery parameter), the influence of capacity is greater than the influence of self-discharge and efficiency; generally, 0.5<k1≤0.7, 0.1≤k2≤k3≤0.3, preferably, k1=0.6, k2=0.2, k3=0.2.

[0053] Specifically, the performance evaluation module determines the preset recycling standard value corresponding to each battery type according to the battery type of the recycled battery;

[0054] Among them, the preset value of the lithium iron phosphate recycling standard is less than or equal to the preset value of the ternary lithium recycling standard.

[0055] It is understandable that the cycle life of lithium iron phosphate power batteries is relatively long, generally speaking, its cycle life is more than 2000 times, and can even reach 3500 times or more; ternary lithium power batteries have attracted widespread attention for their high energy density and good cycle performance. Compared with lithium iron phosphate power batteries, their cycle life may be slightly shorter, approximately between 1200 and 2000 times; at the same time, the metal materials with recycling value in the positive electrode of lithium iron phosphate are not as good as those of ternary lithium. Therefore, the preset value of the lithium iron phosphate recycling standard is less than or equal to the preset value of the ternary lithium recycling standard.

[0056] In implementation, generally, 2.0≤lithium iron phosphate recycling standard preset value≤ternary lithium recycling standard preset value≤2.5; preferably, lithium iron phosphate recycling standard preset value=2.1, ternary lithium recycling standard preset value 2.3.

[0057] It is understandable that lithium iron phosphate power batteries have a longer cycle life and relatively low recycling value metal material content. The preset value of their recycling standards is set to be less than or equal to the preset value of ternary lithium power batteries. This differentiated setting reflects the consideration of different battery technology characteristics and ensures the scientific nature of recycling decisions.

[0058] Specifically, the performance evaluation module determines the battery recycling method according to the preset recycling standard value corresponding to the battery type combined with the electric energy recovery parameter, wherein, when the battery type of the recycled battery is lithium iron phosphate:

[0059] If the electric energy recovery parameter of the lithium iron phosphate recycling battery is greater than the preset value of the lithium iron phosphate recycling standard, it is determined that the recycled battery has the value of downgrading and recycling, and the battery recycling method is determined to be cascade utilization;

[0060] If the electric energy recovery parameter of the lithium iron phosphate recycling battery is less than or equal to the preset value of the lithium iron phosphate recycling standard, it is determined that the recycled battery has no downgrading and recycling value, and the battery recycling method is determined to be recycling and disassembly.

[0061] Specifically, the performance evaluation module determines the battery recycling method according to the preset recycling standard value corresponding to the battery type combined with the electric energy recovery parameter, wherein, when the battery type of the recycled battery is ternary lithium:

[0062] If the electric energy recovery parameter of the ternary lithium recycled battery is greater than the preset value of the ternary lithium recycling standard, it is determined that the recycled battery has the value of downgrading and recycling, and the battery recycling method is determined to be cascade utilization;

[0063] If the electric energy recovery parameter of the ternary lithium recycling battery is less than or equal to the preset value of the ternary lithium recycling standard, it is determined that the recycled battery has no value for downgrading and recycling, and the battery recycling method is determined to be recycling and disassembly.

[0064] It can be understood that cascade utilization is to properly repair and unify the standards of retired batteries with high remaining capacity and that meet the overall usage needs, and then put them into secondary use in fields with lower requirements for battery performance, such as energy storage (grid frequency and peak regulation, peak shaving and valley filling, wind and solar energy storage, tower base stations, etc.) and low-speed electric vehicles; recycling and disassembly is the centralized recycling of scrapped power batteries, and the use of process technology to recover nickel, cobalt, manganese, copper, aluminum, lithium and other metals in the batteries, and then recycle these materials to manufacture power battery packs for use in new energy vehicles.

[0065] It is understandable that the performance evaluation module determines the battery recycling method through the relationship between the preset value of the recycling standard corresponding to the battery type and the electric energy recovery parameter, thereby maximizing the utilization of the recycled battery value; for lithium iron phosphate and ternary lithium power batteries, when the electric energy recovery parameter is higher than its corresponding preset value, the system determines that the battery has the value of downgrading and recycling, and recommends the use of a cascade utilization method to put the battery into areas with lower performance requirements, such as energy storage and low-speed electric vehicles, effectively extending the battery life and promoting the recycling of resources. When the electric energy recovery parameter is lower than the preset value, the system determines that the battery is no longer suitable for downgrading, and instead recommends recycling and disassembly, extracting the precious metal elements in the battery through professional technology, and providing raw materials for the subsequent production of power batteries, ensuring the maximum recycling and utilization of resources; this flexible and changeable recycling method selection not only improves the economic value of recycled batteries, but also reduces resource waste and environmental pollution, and contributes to the sustainable development of the new energy vehicle industry.

[0066] Specifically, the performance evaluation module determines the preset number of charge and discharge cycles according to the current actual capacity and the original cycle life, and the preset number of charge and discharge cycles is calculated according to the following formula:

[0067] , where N is the preset number of charge and discharge cycles, C1 is the original standard capacity, N0 is the number of charge and discharge cycles corresponding to the original standard capacity, k is the correction coefficient, and C is the current actual capacity;

[0068] The original standard capacity C1 and the number of charge and discharge cycles N0 corresponding to the original standard capacity are determined according to the original cycle life.

[0069] Specifically, the information acquisition module is also used to obtain the historical charge and discharge information of the recycled battery, the historical charge and discharge information includes the charging type of each charge, the charging type includes fast charging and slow charging, and the performance evaluation module determines the value of the correction coefficient according to the ratio of the number of charging times corresponding to each charging type and the current actual capacity.

[0070] In implementation, the ratio of the number of charging times corresponding to each charging type is the ratio of the number of historical fast charging times to the number of historical slow charging times;

[0071] In practice, the relationship between the number of charge and discharge cycles and the capacity of the battery is close to a linear relationship, but the slope is different. The smaller the capacity, the slower the increase in the number of charge and discharge cycles corresponding to it. (1) When the ratio of the number of charge times corresponding to each charging type is ≥ 2, the correction coefficient is calculated according to the following formula: ; (2) 1<When the ratio of the number of charging times corresponding to each charging type is less than 2, the correction coefficient is calculated according to the following formula: ; (3) When the ratio of the number of charging times corresponding to each charging type is ≤1, the correction coefficient is calculated according to the following formula: ; Among them, a is the type correction coefficient, c is the capacity correction coefficient, b is the ratio of the number of charging times corresponding to each charging type, and C is the current actual capacity.

[0072] It is understandable that the performance evaluation module, by introducing the correction coefficient, deeply considers the comprehensive impact of the charging type distribution and the current actual capacity on the battery performance evaluation, and realizes a more refined measurement of the battery performance; according to the ratio of fast charging to slow charging times and the actual situation of the remaining battery capacity, the value of the correction coefficient is dynamically adjusted, which not only reflects the different contributions of charging behavior to battery loss, but also fully considers the physical property of the slowdown in the number of charge and discharge cycles when the battery capacity decreases; it improves the accuracy and scientificity of battery performance evaluation, and also provides strong support for enterprises to formulate more reasonable battery recycling and reuse strategies.

[0073] It can be understood that the original standard capacity and the number of charge and discharge cycles corresponding to the original standard capacity are determined by the original cycle life; in implementation, the original cycle life is that after Y charge and discharge cycles, its capacity will drop to 80% of the original rated capacity, then the corresponding original standard capacity is 80%, and the number of charge and discharge cycles corresponding to the corresponding original standard capacity is Y, that is, C1=80%, N0=Y.

[0074] Specifically, the performance evaluation module determines the performance tendency parameter of the recycled battery according to the ratio of the preset charge and discharge cycle number to the current charge and discharge cycle number.

[0075] It can be understood that the performance tendency parameter = preset charge and discharge cycle number ÷ current charge and discharge cycle number, and the preset charge and discharge cycle number is usually the value under ideal conditions, so the preset charge and discharge cycle number ≥ current charge and discharge cycle number. In practice, the closer the current charge and discharge cycle number is to its charge and discharge cycle number, the smaller the value of the performance tendency parameter (the closer to 1), which means the performance of the recycled battery is better.

[0076] It can be understood that the performance evaluation module innovatively evaluates the performance status of recycled batteries by introducing a performance tendency parameter, further refining the scientificity and accuracy of battery recycling decisions; this parameter is based on the ratio of the preset number of charge and discharge cycles to the current number of cycles, and intuitively reflects the potential of the remaining service life of the battery. Among them, when the performance tendency parameter is close to 1, it indicates that the battery performance remains good and has a high reuse value.

[0077] Specifically, the performance evaluation module determines the performance tendency type of the recycled battery according to the performance tendency parameter and the performance tendency reference value, including:

[0078] If the performance tendency parameter is greater than or equal to the performance tendency reference value, the performance tendency type is judged to be an abnormal tendency state;

[0079] If the performance tendency parameter is less than the performance tendency reference value, the performance tendency type is determined to be a normal tendency state.

[0080] In implementation, 1.05≤performance tendency reference value≤1.3, preferably, performance tendency reference value = 1.15. It can be understood that by setting the performance tendency reference value, the performance evaluation module can accurately distinguish the performance tendency type of the battery, providing a strong basis for recycling decisions.

[0081] Specifically, the performance evaluation module determines the durability of the recycled battery according to the battery recycling method and the performance tendency type, including:

[0082] If the battery recycling method is cascade utilization and the performance tendency type is a normal tendency state, it is judged that the durability of the recycled battery is good and the durability meets the standard;

[0083] If the battery recycling method is cascade utilization but the performance tendency type is an abnormal tendency state, it is judged that the durability of the recycled battery is poor and the durability does not meet the standard.

[0084] It is understandable that in the cascade utilization scenario: for batteries in a normal tendency state, their durability is affirmed (durability meets the standard), which helps to extend the life of the battery in secondary applications; while for batteries in an abnormal tendency state, their durability is judged to be insufficient (durability does not meet the standard), avoiding possible risks in downgrading utilization; this evaluation process not only optimizes the allocation of battery recycling resources, but also improves the safety and reliability of battery reuse, injecting new vitality into the sustainable development of the new energy vehicle recycling battery industry.

[0085] It is to be understood that the formulas mentioned in the present invention are dimensionless for calculation.

[0086] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A durability performance testing system for recycled batteries of new energy vehicles, It is characterized in that include: An information collection module, used to obtain the battery type and original factory data of the recycled battery, the battery type includes lithium iron phosphate battery and ternary lithium battery, and the original factory data includes original rated capacity, original cycle life, original self-discharge rate and original efficiency; A performance detection module, used to determine the recycling data of the recycled battery, wherein the recycling data includes the current actual capacity, the current number of charge and discharge cycles, the current self-discharge rate and the current efficiency; An information integration module, which is connected to the information acquisition module and the performance detection module respectively, and is used to determine the electric energy recovery parameters of the recycled battery according to the recycled use data and the original factory data; The information integration module determines the electric energy recovery parameter of the recycled battery according to the recycling and use data and the original factory data. The electric energy recovery parameter is calculated according to the following formula: , where K is the energy recovery parameter, C is the current actual capacity, C0 is the original rated capacity, R is the current self-discharge rate, R0 is the original self-discharge rate, η is the current efficiency, η0 is the original efficiency, k1 is the capacity coefficient, k2 is the self-discharge coefficient, k3 is the efficiency coefficient, k1>k3≥k2; a performance evaluation module, which is connected to the information acquisition module, the performance detection module and the information integration module respectively, and is used to determine the preset recycling standard value corresponding to each battery type to determine the battery recycling method in combination with the electric energy recovery parameter, determine the preset number of charge and discharge cycles according to the current actual capacity, determine the performance tendency parameter of the recycled battery according to the ratio of the preset number of charge and discharge cycles to the current number of charge and discharge cycles to determine the performance tendency type, and evaluate the durability of the recycled battery according to the battery recycling method and the performance tendency type; Wherein, the battery recycling method includes cascade utilization and recycling disassembly; The performance evaluation module determines the performance tendency type of the recycled battery according to the performance tendency parameter and the performance tendency reference value, including: If the performance tendency parameter is greater than or equal to the performance tendency reference value, the performance tendency type is judged to be an abnormal tendency state; If the performance tendency parameter is less than the performance tendency reference value, the performance tendency type is judged to be a normal tendency state; The performance evaluation module determines the durability of the recycled battery according to the battery recycling method and the performance tendency type, including: If the battery recycling method is cascade utilization and the performance tendency type is a normal tendency state, it is judged that the durability of the recycled battery meets the standard; If the battery recycling method is cascade utilization but the performance tendency type is an abnormal tendency state, it is determined that the durability of the recycled battery does not meet the standard.

2. The durability performance testing system for recycling batteries of new energy vehicles according to claim 1, It is characterized in that The performance evaluation module determines the preset recycling standard value corresponding to each battery type according to the battery type of the recycled battery; Among them, the preset value of the lithium iron phosphate recycling standard is less than or equal to the preset value of the ternary lithium recycling standard.

3. The durability performance testing system for recycling batteries of new energy vehicles according to claim 2, It is characterized in that The performance evaluation module determines the battery recycling method according to the preset recycling standard value corresponding to the battery type combined with the electric energy recycling parameter, wherein when the battery type of the recycled battery is lithium iron phosphate: If the electric energy recovery parameter is greater than the preset value of the lithium iron phosphate recovery standard, the battery recovery method is determined to be cascade utilization; If the electric energy recovery parameter is less than or equal to the preset value of the lithium iron phosphate recovery standard, the battery recovery method is determined to be recycling and disassembly.

4. The durability performance testing system for recycling batteries of new energy vehicles according to claim 2, It is characterized in that The performance evaluation module determines the battery recycling method according to the preset recycling standard value corresponding to the battery type combined with the electric energy recovery parameter, wherein when the battery type of the recycled battery is ternary lithium: If the electric energy recovery parameter is greater than the preset value of the ternary lithium recovery standard, the battery recovery method is determined to be cascade utilization; If the electric energy recovery parameter is less than or equal to the preset value of the ternary lithium recycling standard, the battery recycling method is determined to be recycling and disassembly.

5. The durability performance testing system for recycling batteries of new energy vehicles according to claim 1, It is characterized in that The performance evaluation module determines a preset number of charge and discharge cycles according to the current actual capacity and the original cycle life, and the preset number of charge and discharge cycles is calculated according to the following formula: , where N is the preset number of charge and discharge cycles, C1 is the original standard capacity, N0 is the number of charge and discharge cycles corresponding to the original standard capacity, k is the correction coefficient, and C is the current actual capacity; The original standard capacity C1 and the number of charge and discharge cycles N0 corresponding to the original standard capacity are determined according to the original cycle life.

6. The durability performance testing system for recycling batteries of new energy vehicles according to claim 5, It is characterized in that The information acquisition module is also used to obtain historical charging and discharging information of the recycled battery, the historical charging and discharging information includes the charging type of each charging, the charging type includes fast charging and slow charging, and the performance evaluation module determines the value of the correction coefficient according to the ratio of the number of charging times corresponding to each charging type and the current actual capacity.

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