Reorganization method, system, device and storage medium for cascade utilization of retired battery packs

Abstract

The present invention discloses a method, system, device, and storage medium for the recombination of retired battery packs for cascade utilization. The method comprises obtaining the sum of the open-circuit voltages of the retired battery pack's individual cells and the total voltage of the battery pack; selecting retired battery packs whose difference between the sum of the open-circuit voltages of the retired battery pack's individual cells and the total voltage of the battery pack meets a set threshold as cascade-reutilized power batteries; and reorganizing the cascade-reutilized power batteries according to usage conditions and recombination standards. The present invention significantly shortens the reorganization time of battery packs and saves testing costs. By setting different recombination standards based on the usage conditions of the cascade-reutilized batteries in different scenarios, the method can not only meet application requirements in different scenarios, but also maximize the utilization of retired power batteries and improve the utilization rate of retired power batteries.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicles and battery energy storage, and specifically relates to a reorganization method, system, equipment and storage medium for the cascade utilization of retired battery packs. Background Art

[0002] In recent years, my country's electric vehicle industry has experienced rapid growth. Currently, electric vehicles primarily rely on lithium-ion batteries as their power source. During vehicle use, battery performance degrades, and performance variations between batteries become increasingly pronounced. When batteries no longer meet the demands of electric vehicles, they are retired from use. With the rapid growth of my country's automotive industry, the volume of retired batteries is expected to increase rapidly, reaching 100GWh by 2025. Many retired batteries still have significant residual energy. Through re-screening and reassembly, these batteries can be repurposed for applications requiring lower performance, achieving a second-life cycle for batteries. With my country's goals of achieving carbon peak and carbon neutrality by 3060 and building a new power system dominated by new energy, electrochemical energy storage, particularly lithium-ion batteries, is poised for rapid growth. However, the high cost of battery systems is currently the primary bottleneck hindering their large-scale application. Utilizing retired electric vehicle batteries for energy storage can significantly reduce system costs, enhance the lifecycle value of batteries, and contribute to the achievement of my country's dual carbon goals.

[0003] Compared with new batteries, the performance differences between power batteries increase significantly when they are retired, and the consistency deteriorates significantly. Therefore, they usually need to be reassembled before cascade utilization to ensure better performance consistency during the cascade utilization process. However, if the batteries are disassembled into single cells and then reassembled, although the reassembled batteries can have better consistency, the reassembly cost is greatly increased. At the same time, the battery capacity is tested one by one according to traditional methods, resulting in a long cycle and occupying more equipment, which significantly increases the testing cost and worsens the economic efficiency of the cascade utilization stage. There are many potential application scenarios for the cascade utilization of retired power batteries. The operating conditions in each scenario vary greatly, and the performance differences between the batteries in cascade utilization are also different. Summary of the Invention

[0004] The present invention addresses the technical problems existing in the reorganization of retired power battery modules in the prior art, and aims to provide a reorganization method, system, equipment and storage medium for the cascade utilization of retired battery packs. The reorganization method significantly shortens the reorganization time of the battery pack, saves detection costs and improves the reorganization efficiency.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A method for re-utilizing retired battery packs comprises the following steps:

[0007] Obtain the open circuit voltage of a single cell in a retired battery pack and the total voltage of the battery pack;

[0008] Selecting a retired battery pack whose difference between the open-circuit voltage of a single cell of the retired battery pack and the total voltage of the battery pack meets a set threshold as a power battery for cascade utilization;

[0009] The second-life power battery is reassembled according to usage conditions and reassembly standards.

[0010] A further improvement of the present invention is that before obtaining the open-circuit voltage of the single cell of the retired battery pack and the total voltage of the battery pack, it is first determined whether the insulation of the single cell of the retired battery pack meets the set value. If so, the open-circuit voltage of the single cell of the retired battery pack and the total voltage of the battery pack are obtained.

[0011] A further improvement of the present invention is that the insulation of the retired battery pack single cell is calculated by the following formula:

[0012] JR=R / V e

[0013] Where JR is the insulation, R is the insulation resistance between the positive electrode of the battery pack and the outer shell or between the battery pack accessories and the outer shell, V e is the nominal voltage of the battery pack.

[0014] A further improvement of the present invention is that the retired battery pack single cell is a lithium iron phosphate single cell or a ternary material single cell;

[0015] The open circuit voltage of a lithium iron phosphate single cell is 2.7-3.5V, and the open circuit voltage of a ternary material single cell is 2.8-4.2V.

[0016] A further improvement of the present invention is that the use conditions include voltage levels, and the voltage levels include voltage levels less than 100V, voltage levels of 100-300V, voltage levels of 300-500V, voltage levels of 500-1000V, and voltage levels greater than 1000V.

[0017] A further improvement of the present invention is that the reconfiguration standard includes: when the open circuit voltage difference between the single cells in the battery pack is less than 100mV, the impedance deviation at the same frequency is less than 30%; when the open circuit voltage difference between the single cells in the battery pack is less than 80mV, the impedance deviation at the same frequency is less than 25%; when the open circuit voltage difference between the single cells in the battery pack is less than 70mV, the impedance deviation at the same frequency is less than 20%; when the open circuit voltage difference between the single cells in the battery pack is less than 60mV, the impedance deviation at the same frequency is less than 15%; when the open circuit voltage difference between the single cells in the battery pack is less than 50mV, the impedance deviation at the same frequency is less than 10%;

[0018] When the open circuit voltage difference between battery packs is less than 1000mV, the impedance deviation at the same frequency is less than 20%; when the open circuit voltage difference between battery packs is less than 800mV, the impedance deviation at the same frequency is less than 15%; when the open circuit voltage difference between battery packs is less than 700mV, the impedance deviation at the same frequency is less than 12%; when the open circuit voltage difference between battery packs is less than 600mV, the impedance deviation at the same frequency is less than 10%; when the open circuit voltage difference between battery packs is less than 500mV, the impedance deviation at the same frequency is less than 8%.

[0019] A further improvement of the present invention is that the impedance deviation between the single cells in the battery pack is determined by the following process:

[0020] The difference between the maximum AC impedance modulus of the single cells in the battery pack and the minimum AC impedance modulus of the single cells in the battery pack is divided by the minimum AC impedance modulus of the single cells in the battery pack.

[0021] A reorganization system for the cascade utilization of retired battery packs, comprising:

[0022] A voltage acquisition module is used to obtain the open circuit voltage of a single cell in a retired battery pack and the total voltage of the battery pack;

[0023] A selection module is configured to select a battery whose difference between the open-circuit voltage of a single cell of the retired battery pack and the total voltage of the battery pack meets a set threshold as a second-use power battery;

[0024] The reorganization module is used to reorganize the used power battery according to usage conditions and reorganization standards.

[0025] A further improvement of the present invention is that before obtaining the open-circuit voltage of the single cell of the retired battery pack and the total voltage of the battery pack, it is first determined whether the insulation of the single cell of the retired battery pack meets the set value. If so, the open-circuit voltage of the single cell of the retired battery pack and the total voltage of the battery pack are obtained.

[0026] A further improvement of the present invention is that the insulation of the retired battery pack single cell is calculated by the following formula:

[0027] JR=R / V e

[0028] Where JR is the insulation, R is the insulation resistance between the positive electrode of the battery pack and the outer shell or between the battery pack accessories and the outer shell, V e is the nominal voltage of the battery pack.

[0029] A further improvement of the present invention is that the retired battery pack single cell is a lithium iron phosphate single cell or a ternary material single cell;

[0030] The open circuit voltage of a lithium iron phosphate single cell is 2.7-3.5V, and the open circuit voltage of a ternary material single cell is 2.8-4.2V.

[0031] A further improvement of the present invention is that the use conditions include voltage levels, and the voltage levels include voltage levels less than 100V, voltage levels of 100-300V, voltage levels of 300-500V, voltage levels of 500-1000V, and voltage levels greater than 1000V.

[0032] A further improvement of the present invention is that the reconfiguration standard includes: when the open circuit voltage difference between the single cells in the battery pack is less than 100mV, the impedance deviation at the same frequency is less than 30%; when the open circuit voltage difference between the single cells in the battery pack is less than 80mV, the impedance deviation at the same frequency is less than 25%; when the open circuit voltage difference between the single cells in the battery pack is less than 70mV, the impedance deviation at the same frequency is less than 20%; when the open circuit voltage difference between the single cells in the battery pack is less than 60mV, the impedance deviation at the same frequency is less than 15%; when the open circuit voltage difference between the single cells in the battery pack is less than 50mV, the impedance deviation at the same frequency is less than 10%;

[0033] When the open circuit voltage difference between battery packs is less than 1000mV, the impedance deviation at the same frequency is less than 20%; when the open circuit voltage difference between battery packs is less than 800mV, the impedance deviation at the same frequency is less than 15%; when the open circuit voltage difference between battery packs is less than 700mV, the impedance deviation at the same frequency is less than 12%; when the open circuit voltage difference between battery packs is less than 600mV, the impedance deviation at the same frequency is less than 10%; when the open circuit voltage difference between battery packs is less than 500mV, the impedance deviation at the same frequency is less than 8%.

[0034] A further improvement of the present invention is that the impedance deviation between the single cells in the battery pack is determined by the following process:

[0035] The difference between the maximum AC impedance modulus of the single cells in the battery pack and the minimum AC impedance modulus of the single cells in the battery pack is divided by the minimum AC impedance modulus of the single cells in the battery pack.

[0036] A computer device includes a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the computer program is executed by the processor, the reorganization method for the cascade utilization of retired battery packs as described above is implemented.

[0037] A computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the above-mentioned method for reusing retired battery packs.

[0038] The present invention proposes a battery recombination method for retired power battery modules, which adopts the open-circuit voltage and impedance detection at different frequencies, and sets different thresholds for different voltage levels during cascade utilization to improve the recombination efficiency of retired batteries in cascade utilization.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention uses the sum of the open-circuit voltage of the retired battery cells and the total voltage of the battery pack to select batteries whose difference between the sum of the open-circuit voltage of the retired battery cells and the total voltage of the battery pack meets a set threshold as cascade-reutilized power batteries. This significantly shortens the battery pack reassembly time and saves testing costs. Different reassembly standards are set according to the usage conditions of the cascade-reutilized batteries in different scenarios. This can not only meet the application needs in different scenarios, but also maximize the utilization of retired power batteries and improve the utilization rate of retired power batteries. At the same time, the battery modules are no longer disassembled and can be directly recycled in the form of modules, significantly improving the economic efficiency of the power battery cascade utilization. This method has broad application prospects in the fields of electric vehicles, electrochemical energy storage, and power battery cascade utilization.

[0041] Furthermore, according to different voltage levels, the open circuit voltage difference and impedance deviation at the same frequency between single cells in the battery pack, as well as the open circuit voltage difference and impedance deviation at the same frequency between battery packs are set to improve the recombination efficiency of retired batteries for cascade utilization.

[0042] Furthermore, the battery open circuit voltage and impedance values ​​at different frequencies are reorganized, which greatly shortens the battery detection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a reorganization flow chart for the cascade utilization of retired power battery packs according to the present invention;

[0044] Figure 2 It is a specific implementation flow chart of the present invention;

[0045] Figure 3 Schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0047] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0048] The present invention may be described in the general context of computer-executable instructions, such as program modules, executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform specific tasks or implement specific abstract data types. The present invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media, including storage devices.

[0049] In the present invention, "module", "device", "system" and the like refer to related entities applied to a computer, such as hardware, a combination of hardware and software, software or software in execution, etc. Specifically, for example, an element can be, but is not limited to, a process running on a processor, a processor, an object, an executable element, an execution thread, a program and / or a computer. In addition, an application or script program running on a server, or a server can all be an element. One or more elements can be in an execution process and / or thread, and an element can be localized on a computer and / or distributed between two or more computers, and can be run by various computer-readable media. An element can also communicate through local and / or remote processes based on a signal having one or more data packets, for example, a signal from a data packet interacting with another element in a local system, a distributed system, and / or a signal from a network on the Internet that interacts with other systems via signals.

[0050] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include" and "comprise" include not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or device. In the absence of further limitations, the elements defined by the phrase "include..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0051] The present invention provides a method for reassembling retired battery packs during cascade utilization, which is mainly aimed at power batteries that will be retired on a large scale in the future. First, the battery pack's appearance, insulation, open-circuit voltage of individual cells within the pack, battery pack voltage, internal resistance of individual cells within the pack at different frequency points, and internal resistance of the battery pack are tested to exclude battery packs with problems in the above parameters. Then, targeted reassembly standards are adopted based on the different voltage levels of the battery system during cascade utilization. This significantly shortens the inspection time of retired battery packs, fully realizes the residual value of retired power batteries, and improves the technical and economic efficiency of the cascade utilization of retired power batteries.

[0052] See also Figure 1 A method for reusing retired battery packs according to the present invention comprises the following steps:

[0053] Obtain the open circuit voltage of a single cell in a retired battery pack and the total voltage of the battery pack;

[0054] Selecting a battery whose difference between the open-circuit voltage of a single cell of the retired battery pack and the total voltage of the battery pack meets a set threshold as a second-use power battery;

[0055] The second-life power battery is reassembled according to usage conditions and reassembly standards.

[0056] Example 1

[0057] See also Figure 2 , the specific steps of the present invention are as follows:

[0058] (1) Appearance inspection of battery packs: In a well-lit environment on site, check whether the battery packs have deformation, electrolyte leakage, burning at the positive and negative electrode connections, arcing, and other problems. For retired battery packs with the above problems, there are high safety hazards. Instead of cascade utilization, the retired batteries are directly recycled for key materials.

[0059] (2) Battery pack insulation performance test: Use an insulation tester to measure the insulation resistance R between the positive electrode and the shell of the battery pack, and between the battery pack accessories and the shell, and then measure the insulation resistance R according to the nominal voltage V of the battery pack. e , calculate the insulation JR of the battery pack, the formula is as follows:

[0060] Battery pack insulation JR = R / V e

[0061] When JR is less than 800Ω / V, the insulation performance of the surface battery pack is reduced, there is a greater insulation risk, and it is not suitable for cascade utilization. When JR is greater than or equal to 800Ω / V, proceed to step (3).

[0062] (3) Detection of open circuit voltage and total voltage of battery pack: Use a high-precision voltage tester to measure the open circuit voltage of each single cell in the battery pack through the voltage port on the battery pack. The open circuit voltage of the first cell is recorded as V1, the open circuit voltage of the second cell is recorded as V2, ..., and the open circuit voltage of the nth cell is recorded as V n (n is the number of single cells in series in the battery pack), and then the total voltage V of the battery pack is measured by the total positive and total negative c .

[0063] First, determine whether the open circuit voltage of the single cell is within a reasonable range. The reasonable range of the open circuit voltage of the lithium iron phosphate single cell is set to 2.7-3.5V, and the reasonable range of the open circuit voltage of the ternary material single cell is set to 2.8-4.2V. If the open circuit voltage of the single cell is not within the reasonable range, the battery is at risk of overcharge or overdischarge and is not suitable for cascade utilization. If the open circuit voltage of the single cell is within the reasonable range, calculate the open circuit voltage and V t , calculate the open circuit voltage and V of each single cell t and measure the total voltage of the battery pack V c The difference between V d , if the difference V d If the difference V is greater than 100mV, it is considered that there is a poor contact or open circuit in the battery pack and it is not suitable for cascade use. d If it is less than or equal to 100mV, proceed to step (4).

[0064] (4) Battery pack single cell impedance and total impedance detection: First, apply AC signals at different frequencies to the batteries one by one through the single cell voltage acquisition port to test the AC impedance modulus of the batteries at different frequencies. The test frequencies are 1000Hz, 300Hz, 100Hz, 50Hz, 15Hz, 5Hz and 1Hz respectively. The AC impedance modulus of the first battery is recorded as Z 1-1000 、Z 1-300 、Z 1-100 、Z 1-50 、Z 1-15 、Z 1-5 and Z 1-1 , the impedance values ​​of the second battery are recorded as Z 2-1000 、Z 2-300 、Z 2-100 、Z 2-50 、Z 2-15 、Z 2-5 and Z 2-1 , and so on, the impedance values ​​of the nth battery are recorded as Z n-1000 、Z n-300 、Z n-100 、Z n-50 、Zn-15 、Z n-5 and Z n-1 Then, an AC signal is applied through the positive and negative electrodes of the battery pack to test the AC impedance modulus of the battery pack at the same frequency (the test frequencies are 1000Hz, 300Hz, 100Hz, 50Hz, 15Hz, 5Hz and 1Hz respectively), and the AC impedance modulus of the mth battery is recorded as Z m-1000 The AC impedance modulus of the mth battery is recorded as Z m-300 The AC impedance modulus of the mth battery is recorded as Z m-100 The AC impedance modulus of the mth battery is recorded as Z m-50 、Z m-15 The AC impedance modulus of the mth battery is recorded as Z m-5 The AC impedance modulus of the mth battery is recorded as Z m-1 . m is any one from 1 to n.

[0065] The impedance deviation between single cells in the battery pack is:

[0066] The difference between the maximum AC impedance modulus of the single cells in the battery pack and the minimum AC impedance modulus of the single cells in the battery pack is divided by the minimum AC impedance modulus of the single cells in the battery pack.

[0067] Similarly, the impedance deviation between battery packs at the same frequency is:

[0068] The difference between the maximum AC impedance modulus of the battery pack and the minimum AC impedance modulus of the battery pack is divided by the minimum AC impedance modulus of the battery pack.

[0069] (5) Reorganization of battery packs at different voltage levels: For battery packs that meet the conditions for cascade utilization in terms of appearance, insulation performance, open circuit voltage and other parameters, different reorganization standards are set according to the different voltage levels of retired power battery packs during cascade utilization. See Table 1 below for details:

[0070] Table 1 Relationship between voltage level and reorganization standard

[0071]

[0072] Example 2

[0073] See also Figure 3 , a reorganization system for the cascade utilization of retired battery packs, comprising:

[0074] A voltage acquisition module is used to obtain the open circuit voltage of a single cell in a retired battery pack and the total voltage of the battery pack;

[0075] A selection module is configured to select a battery whose difference between the open-circuit voltage of a single cell of the retired battery pack and the total voltage of the battery pack meets a set threshold as a second-use power battery;

[0076] The reorganization module is used to reorganize the used power battery according to usage conditions and reorganization standards.

[0077] Among them, before the voltage acquisition module obtains the open-circuit voltage of the retired battery pack single cell and the total voltage of the battery pack, it first determines whether the insulation of the retired battery pack single cell meets the set value. If so, it then obtains whether the insulation meets the set value and the open-circuit voltage of the retired battery pack single cell and the total voltage of the battery pack.

[0078] Preferably, the insulation performance of the retired battery pack single cell is calculated by the following formula:

[0079] JR=R / V e

[0080] Where JR is the insulation, R is the insulation resistance between the positive electrode of the battery pack and the outer shell or between the battery pack accessories and the outer shell, V e is the nominal voltage of the battery pack.

[0081] Preferably, the retired battery pack single cell is a lithium iron phosphate single cell or a ternary material single cell;

[0082] The open circuit voltage of a lithium iron phosphate single cell is 2.7-3.5V, and the open circuit voltage of a ternary material single cell is 2.8-4.2V.

[0083] Preferably, the use conditions include voltage levels, and the voltage levels include voltage levels less than 100V, voltage levels of 100-300V, voltage levels of 300-500V, voltage levels of 500-1000V, and voltage levels greater than 1000V.

[0084] Preferably, the reorganization standards include: when the voltage level is less than 100V, the open circuit voltage difference between the single cells in the battery pack is less than 100mV, and the impedance deviation is less than 30% at the same frequency; when the voltage level is 100-300V, the open circuit voltage difference between the single cells in the battery pack is less than 80mV, and the impedance deviation is less than 25% at the same frequency; when the voltage level is 300-500V, the open circuit voltage difference between the single cells in the battery pack is less than 70mV, and the impedance deviation is less than 20% at the same frequency; when the voltage level is 500-1000V, the open circuit voltage difference between the single cells in the battery pack is less than 60mV, and the impedance deviation is less than 15% at the same frequency; when the voltage level is greater than 1000V, the open circuit voltage difference between the single cells in the battery pack is less than 50mV, and the impedance deviation is less than 10% at the same frequency.

[0085] When the voltage level is less than 100V, the open circuit voltage difference between battery packs is less than 1000mV, and the impedance deviation is less than 20% at the same frequency; when the voltage level is 100-300V, the open circuit voltage difference between battery packs is less than 800mV, and the impedance deviation is less than 15% at the same frequency; when the voltage level is 300-500V, the open circuit voltage difference between battery packs is less than 700mV, and the impedance deviation is less than 12% at the same frequency; when the voltage level is 500-1000V, the open circuit voltage difference between battery packs is less than 600mV, and the impedance deviation is less than 10% at the same frequency; when the voltage level is greater than 1000V, the open circuit voltage difference between battery packs is less than 500mV, and the impedance deviation is less than 8% at the same frequency.

[0086] Preferably, the impedance deviation between the single cells in the battery pack is determined by the following process:

[0087] The difference between the maximum AC impedance modulus of the single cells in the battery pack and the minimum AC impedance modulus of the single cells in the battery pack is divided by the minimum AC impedance modulus of the single cells in the battery pack.

[0088] Example 3

[0089] A computer device includes a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the computer program is executed by the processor, the reorganization method for the cascade utilization of retired battery packs as described above is implemented.

[0090] Example 4

[0091] A computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the above-mentioned method for reusing retired battery packs.

[0092] Based on the test results of the appearance, insulation resistance, open circuit voltage, and impedance at different frequencies of retired power battery packs, the present invention eliminates batteries that have no value for cascade utilization and have high safety hazards. Then, according to different application scenarios during cascade utilization, the open circuit voltage difference between cells, the open circuit voltage difference between battery packs, the impedance deviation between cells, and the impedance deviation between battery packs are used as parameters to set different threshold ranges and establish corresponding reorganization methods. This method takes into account the cascade utilization of batteries with different performance differences, greatly shortens the detection cost during the reorganization of retired battery packs, improves the cascade utilization rate of retired power batteries, and enhances the technical and economic efficiency of the cascade utilization of power batteries. The methods adopted by the present invention are relatively easy to implement in engineering implementation and have high application value.

[0093] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0094] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0095] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0096] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A reorganization method for the cascade utilization of retired battery packs, characterized in that: The following steps are involved: Obtain the open circuit voltage of a single cell in a retired battery pack and the total voltage of the battery pack; Selecting a retired battery pack whose difference between the open-circuit voltage of a single cell of the retired battery pack and the total voltage of the battery pack meets a set threshold as a power battery for cascade utilization; Reorganize the used power battery according to usage conditions and reorganization standards; The reorganization standards include: when the voltage level is less than 100V, the open circuit voltage difference between the single cells in the battery pack is less than 100mV, and the impedance deviation is less than 30% at the same frequency; when the voltage level is 100-300V, the open circuit voltage difference between the single cells in the battery pack is less than 80mV, and the impedance deviation is less than 25% at the same frequency; when the voltage level is 300-500V, the open circuit voltage difference between the single cells in the battery pack is less than 70mV, and the impedance deviation is less than 20% at the same frequency; when the voltage level is 500-1000V, the open circuit voltage difference between the single cells in the battery pack is less than 60mV, and the impedance deviation is less than 15% at the same frequency; when the voltage level is greater than 1000V, the open circuit voltage difference between the single cells in the battery pack is less than 50mV, and the impedance deviation is less than 10% at the same frequency; When the voltage level is less than 100V, the open circuit voltage difference between battery packs is less than 1000mV, and the impedance deviation is less than 20% at the same frequency; when the voltage level is 100-300V, the open circuit voltage difference between battery packs is less than 800mV, and the impedance deviation is less than 15% at the same frequency; when the voltage level is 300-500V, the open circuit voltage difference between battery packs is less than 700mV, and the impedance deviation is less than 12% at the same frequency; when the voltage level is 500-1000V, the open circuit voltage difference between battery packs is less than 600mV, and the impedance deviation is less than 10% at the same frequency; when the voltage level is greater than 1000V, the open circuit voltage difference between battery packs is less than 500mV, and the impedance deviation is less than 8% at the same frequency; The impedance deviation between the single cells in the battery pack is determined by the following process: The difference between the maximum AC impedance modulus of the single cells in the battery pack and the minimum AC impedance modulus of the single cells in the battery pack is divided by the minimum AC impedance modulus of the single cells in the battery pack; The impedance deviation between battery packs at the same frequency is: The difference between the maximum AC impedance modulus of the battery pack and the minimum AC impedance modulus of the battery pack is divided by the minimum AC impedance modulus of the battery pack; Before obtaining the open circuit voltage of the retired battery pack single cell and the total voltage of the battery pack, first determine whether the insulation of the retired battery pack single cell meets the set value. If so, then obtain whether the insulation meets the set value single cell open circuit voltage of the retired battery pack single cell and the total voltage of the battery pack.

2. The method for reusing retired battery packs according to claim 1, characterized in that: The insulation performance of the retired battery pack single cell is calculated by the following formula: JR=R / V e Where JR is the insulation, R is the insulation resistance between the positive electrode of the battery pack and the outer shell or between the battery pack accessories and the outer shell, V e is the nominal voltage of the battery pack.

3. The method for reusing retired battery packs according to claim 1, characterized in that: The retired battery pack single cell is a lithium iron phosphate single cell or a ternary material single cell; The open circuit voltage of a lithium iron phosphate single cell is 2.7-3.5V, and the open circuit voltage of a ternary material single cell is 2.8-4.2V.

4. A reorganization system for the cascade utilization of retired battery packs, characterized in that: include: A voltage acquisition module is used to obtain the open circuit voltage of a single cell in a retired battery pack and the total voltage of the battery pack; A selection module is configured to select a battery whose difference between the open-circuit voltage of a single cell of the retired battery pack and the total voltage of the battery pack meets a set threshold as a second-use power battery; A reassembly module, configured to reassemble the used power battery according to usage conditions and reassembly standards; The reorganization standards include: when the voltage level is less than 100V, the open circuit voltage difference between the single cells in the battery pack is less than 100mV, and the impedance deviation is less than 30% at the same frequency; when the voltage level is 100-300V, the open circuit voltage difference between the single cells in the battery pack is less than 80mV, and the impedance deviation is less than 25% at the same frequency; when the voltage level is 300-500V, the open circuit voltage difference between the single cells in the battery pack is less than 70mV, and the impedance deviation is less than 20% at the same frequency; when the voltage level is 500-1000V, the open circuit voltage difference between the single cells in the battery pack is less than 60mV, and the impedance deviation is less than 15% at the same frequency; when the voltage level is greater than 1000V, the open circuit voltage difference between the single cells in the battery pack is less than 50mV, and the impedance deviation is less than 10% at the same frequency; When the voltage level is less than 100V, the open circuit voltage difference between battery packs is less than 1000mV, and the impedance deviation is less than 20% at the same frequency; when the voltage level is 100-300V, the open circuit voltage difference between battery packs is less than 800mV, and the impedance deviation is less than 15% at the same frequency; when the voltage level is 300-500V, the open circuit voltage difference between battery packs is less than 700mV, and the impedance deviation is less than 12% at the same frequency; when the voltage level is 500-1000V, the open circuit voltage difference between battery packs is less than 600mV, and the impedance deviation is less than 10% at the same frequency; when the voltage level is greater than 1000V, the open circuit voltage difference between battery packs is less than 500mV, and the impedance deviation is less than 8% at the same frequency; The impedance deviation between the single cells in the battery pack is determined by the following process: The difference between the maximum AC impedance modulus of the single cells in the battery pack and the minimum AC impedance modulus of the single cells in the battery pack is divided by the minimum AC impedance modulus of the single cells in the battery pack; The impedance deviation between battery packs at the same frequency is: The difference between the maximum AC impedance modulus of the battery pack and the minimum AC impedance modulus of the battery pack is divided by the minimum AC impedance modulus of the battery pack; Before obtaining the open circuit voltage of the retired battery pack single cell and the total voltage of the battery pack, first determine whether the insulation of the retired battery pack single cell meets the set value. If so, then obtain whether the insulation meets the set value single cell open circuit voltage of the retired battery pack single cell and the total voltage of the battery pack.

5. The reassembly system for cascade utilization of retired battery packs according to claim 4, characterized in that: The insulation performance of the retired battery pack single cell is calculated by the following formula: JR=R / V e Where JR is the insulation, R is the insulation resistance between the positive electrode of the battery pack and the outer shell or between the battery pack accessories and the outer shell, V e is the nominal voltage of the battery pack.

6. The reorganization system for cascade utilization of retired battery packs according to claim 4, characterized in that: The retired battery pack single cell is a lithium iron phosphate single cell or a ternary material single cell; The open circuit voltage of a lithium iron phosphate single cell is 2.7-3.5V, and the open circuit voltage of a ternary material single cell is 2.8-4.2V.

7. A computer device, characterized in that: The computer device includes a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the computer program is executed by the processor, the reorganization method for the cascade utilization of retired battery packs as described in any one of claims 1 to 3 is implemented.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to execute the method for reusing retired battery packs according to any one of claims 1 to 3.

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