CN113210299B - Battery pack selection method, device, computer equipment and storage medium - Google Patents

Abstract

The present application relates to a battery group selection method, device, computer equipment and storage medium. The method includes: respectively acquiring the first voltage values of each single battery; acquiring a plurality of first voltage differences according to the plurality of first voltage values, each first voltage difference being the difference between any two first voltage values value; when the first voltage difference is greater than or equal to the first difference threshold, output the information that the battery pack is to be disassembled. The method can quickly and accurately sort the decommissioned battery packs.

Description

Battery pack selection method, device, computer equipment and storage medium

technical field

The present application relates to the field of battery recycling, and in particular relates to a battery group sorting method, device, computer equipment and storage medium.

Background technique

The power battery refers to the power source that provides the power source for the tool. It has the characteristics of high energy, high power, high discharge rate, wide working temperature range and long service life. Electric vehicles use a power battery pack composed of multiple single cells, which is composed of hundreds of power batteries with good electrical performance consistency. The power battery determines the performance of the electric vehicle. When the performance of the power battery pack drops to a certain level, in order to ensure the driving and safety needs of the electric vehicle, the power battery should be replaced in time.

However, with the rapid development of the new energy vehicle industry, the replacement and decommissioning of power batteries has resulted in the idleness of a large number of decommissioned power batteries, resulting in energy waste. Cascade utilization of power batteries has become an effective solution to the problem. Due to the wide range of application scenarios of power batteries, the performance of decommissioned batteries will have great inconsistency, and direct use will cause problems of safety and low efficiency. Therefore, it is of great significance to study a sorting method with high speed and high consistency for the utilization of decommissioned batteries.

Contents of the invention

Based on this, it is necessary to address the above technical problems and provide a battery group sorting method, device, computer equipment and storage medium capable of quickly and accurately sorting retired batteries.

A battery pack selection method, the battery pack includes a plurality of single cells, the method comprising:

Obtaining the first voltage value of each single battery respectively;

acquiring a plurality of first voltage differences according to the plurality of first voltage values, each first voltage difference being a difference between any two first voltage values;

When the first voltage difference is greater than or equal to the first difference threshold, output the information that the battery pack is to be disassembled.

In one of the embodiments, it also includes:

When the first voltage difference is less than the first difference threshold, perform the first charging and discharging cycle on the battery pack;

Reacquiring the second voltage value of each single battery at the end of discharge in the first charge and discharge cycle;

acquiring a plurality of second voltage differences according to the plurality of second voltage values, where each second voltage difference is a difference between any two second voltage values;

When the second voltage difference satisfies the first preset condition, the battery pack qualification information is output.

In one of the embodiments, it also includes:

After performing the first charge and discharge cycle, obtain the first discharge capacity in the battery pack;

Wherein, when the second voltage difference satisfies the first preset condition, including:

When the first discharge capacity is larger than the capacity threshold and the second voltage difference is smaller than the second difference threshold, the battery pack qualification information is output.

In one of the embodiments, it also includes:

When the first discharge capacity is less than or equal to the capacity threshold, or the second voltage difference is greater than or equal to the second difference threshold, a second charge-discharge cycle is performed on the battery pack;

reacquiring the third voltage value of each single battery at the end of discharge in the second charge and discharge cycle;

Acquiring a plurality of third voltage differences according to the plurality of third voltage values, where each third voltage difference is a difference between any two third voltage values;

When the third voltage difference satisfies the second preset condition, output the information that the battery pack is to be disassembled.

In one of the embodiments, it also includes:

After performing the second charge and discharge cycle, obtain the second discharge capacity in the battery pack;

When the third voltage difference satisfies the second preset condition, including:

When the second discharge capacity is greater than the capacity threshold and the third voltage difference is smaller than the second difference threshold, output the information that the battery pack is to be disassembled.

In one of the embodiments, it also includes:

When the second discharge capacity is less than or equal to the capacity threshold, or the third voltage difference is greater than or equal to the second difference threshold, output battery pack qualification information.

In one of the embodiments, before performing the second charge-discharge cycle on the battery pack, including:

Configure the balanced voltage value for the single cells of the battery pack;

Perform a second charge and discharge cycle on the battery pack, including:

Equalize charging is performed on each single battery according to the equilibrium voltage value, so as to perform the second charge and discharge cycle.

A battery pack sorting device, comprising:

An acquisition module, configured to respectively acquire the first voltage values of each single battery;

A calculation module, configured to obtain a plurality of first voltage differences according to a plurality of first voltage values, each first voltage difference being the difference between any two first voltage values;

An output module, configured to output the information that the battery pack is to be disassembled when the first voltage difference is greater than or equal to the first difference threshold.

A computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are realized.

The battery group selection method, device, computer equipment, and storage medium respectively obtain the first voltage value of each of the single cells; obtain a plurality of first voltage differences according to the plurality of first voltage values, and each of the first voltage values A voltage difference is the difference between any two first voltage values; when the first voltage difference is greater than or equal to a first difference threshold, output the information that the battery pack is to be disassembled. The battery pack has been used once, and the single cells in it undergo different charge and discharge processes, and work at different ambient temperatures, and their performance will also change differently. The complexity is also high, and the internal inconsistency of the battery pack will directly affect the capacity performance, power performance and remaining life of the battery pack for secondary use. At the same time, the decommissioned battery is more likely to fail. For safety and economy, the battery pack must first be re-sorted into groups, and then disassembled according to the sorting results of the battery pack to continue the sorting of the single cells. This application compares whether the voltage difference between any two single cells in the battery pack satisfies the conditions, and outputs information on whether the battery pack needs to be dismantled, which can quickly, accurately and economically sort retired battery packs that need to be dismantled. , to avoid the problem of cost increase caused by dismantling all decommissioned battery packs at one time.

Description of drawings

Fig. 1 is one of the schematic flow charts of the battery group selection method in an embodiment;

Fig. 2 is the second schematic flow diagram of the battery group selection method in an embodiment;

Fig. 3 is the third schematic flow chart of the battery group selection method in an embodiment;

Fig. 4 is the fourth schematic flow diagram of the battery group selection method in an embodiment;

Fig. 5 is the fifth schematic flow diagram of the battery group selection method in an embodiment;

Fig. 6 is a structural block diagram of a battery group selection device in an embodiment;

Figure 7 is an internal block diagram of a computer device in one embodiment.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

In one embodiment, as shown in Figure 1, a battery pack selection method is provided, comprising the following steps:

Step S100, acquiring the first voltage values of each single battery respectively.

Specifically, the battery pack includes a plurality of single cells, and the voltage of each single cell during the resting process of the battery pack is collected. Taking the decommissioned lithium battery pack as an example, the decommissioned lithium battery pack includes 3 single batteries. The voltages of the three single cells are collected as the first voltage value.

Step S200, acquiring a plurality of first voltage difference values according to a plurality of first voltage values, and each first voltage difference value is a difference between any two first voltage values.

Specifically, the voltage difference between any two single cells in the battery pack is calculated. Taking the above decommissioned lithium battery pack as an example, by calculating the voltage difference between any two of the three single cells, three first voltage differences can be obtained.

Step S300, when the first voltage difference is greater than or equal to the first difference threshold, output the information that the battery pack is to be disassembled.

Specifically, to determine whether the battery pack needs to be disassembled, the plurality of first voltage differences must be greater than or equal to the first preset voltage value before confirming that the battery pack should be classified as a battery pack to be disassembled.

In this embodiment, the performance of the overall performance of the battery pack will be affected by the pressure difference between the single cells. For example, the phenomenon that the battery pack is not fully charged. Therefore, by comparing the first voltage difference with the first difference threshold, it can be determined whether the battery pack can be recycled. If the static pressure difference between the single cells in the battery pack does not meet the standard, it is confirmed that the battery pack can no longer be used, and it will be used after being disassembled.

In one embodiment, the first preset voltage value may be 100mV. It can be understood that the first difference threshold only needs to be equal to the maximum standard pressure difference that any two single cells in the battery pack can withstand.

In the above battery pack selection method, the static pressure difference between the single cells of the battery pack is firstly tested, and whether the battery pack can be recycled is confirmed according to the static pressure difference, so that the battery pack is firstly tested. The group undergoes a round of screening. In this way, information on whether the battery pack is to be disassembled can be quickly and accurately obtained, and the problem of heavy workload and high cost in the screening process of decommissioned batteries is solved. The effect of quickly, accurately and cost-effectively sorting retired batteries is achieved.

In one embodiment, as shown in FIG. 2 , the battery group selection method further includes steps S400 to S430.

Step S400, when the first voltage difference is less than the difference threshold, perform the first charging and discharging cycle on the battery pack.

Step S410, reacquiring the second voltage value of each single battery at the end of discharge in the first charge and discharge cycle.

Wherein, the end of discharge describes that during the discharge process of the battery pack, the SOC (State of charge) of the single battery reaches a preset value, wherein the SOC (State of charge) is represented by To reflect the remaining capacity of the battery, its numerical value is defined as the ratio of the remaining capacity to the battery capacity, usually expressed as a percentage. Its value ranges from 0 to 1. When the SOC (State of charge) is equal to 0, it means that the battery is fully discharged. When the SOC (State of charge) is equal to 1, it means that the battery is fully charged.

Specifically, the second voltage value when the SOC (State of charge) of each single battery in the battery pack is 20% may be collected. It can be understood that the SOC (State of charge) of a single battery can be reasonably set according to the needs of sorting batteries.

Step S420, acquiring a plurality of second voltage difference values according to the plurality of second voltage values, and each second voltage difference value is a difference between any two second voltage values.

Step S430, when the second voltage difference satisfies the first preset condition, output battery pack qualification information.

In this embodiment, by charging and discharging the battery pack, collecting the second voltage difference value of the battery at the end of discharge, and confirming whether the battery pack can be recycled according to the second voltage difference value, the battery pack can be regenerated by simple operation again. Sorting can reduce the problem of a large number of battery sorting, and achieve fast and effective battery sorting.

In one embodiment, as shown in FIG. 3 , in step S420, a plurality of second voltage differences are obtained according to a plurality of second voltage values, and each second voltage difference is the difference between any two second voltage values. After the difference, step S421 and step S431 are also included.

Step S421, acquiring the first discharge capacity in the battery pack.

Wherein, step S430, when the second voltage difference satisfies the first preset condition, output battery pack qualification information, including:

Step S431 , when the first discharge capacity is larger than the capacity threshold and the second voltage difference is smaller than the second difference threshold, output battery pack qualification information.

In this embodiment, by calculating the first discharge capacity of the battery pack during the first charge-discharge cycle, and any two single cells in the battery pack during the first charge-discharge cycle The second differential pressure at the end of discharge during the process is used to analyze the battery pack. Important reference conditions for battery sorting can be added, which is conducive to accurate sorting of retired batteries.

In one embodiment, the capacity threshold is 80% of the nominal capacity of the battery pack. The second difference threshold is 650mV. It can be understood that the second difference threshold and the capacity threshold can be reasonably set according to different decommissioned batteries. For example, the single battery in the battery pack is taken as an example of a lithium iron phosphate electric bus single battery, and its nominal capacity is 100Ah. If the battery pack includes 3 single cells, the nominal capacity of the battery pack is The capacity is 300Ah. The calculation method of the capacity threshold is as follows: the battery pack is charged and discharged once according to the nominal capacity of 0.2C, and its discharge capacity is recorded, which is the capacity threshold.

In one embodiment, in step S450, when the first discharge capacity is greater than the capacity threshold and the second voltage difference is less than the second difference threshold, after outputting the qualified information of the battery pack, the battery can be adjusted according to the first discharge capacity. Groups are graded.

In one embodiment, classifying the battery pack includes: classifying the battery pack according to the first discharge capacity according to the nominal capacity with a capacity difference standard of 10%, that is, with a capacity difference standard of 10Ah. For example, a battery pack with a capacity of 60Ah to 70Ah is one level; a battery pack with a capacity of 70Ah to 80Ah is another level.

In one embodiment, classifying the battery pack further includes: calculating a capacity retention rate according to the calculated first discharge capacity, and classifying the battery pack according to the capacity retention rate. For example, the battery packs are classified by taking the calculated capacity retention rate at 2% as a sorting grade. It should be noted that the method for calculating the capacity retention rate is: dividing the first discharge capacity by the initial discharge capacity of the battery pack to obtain the capacity retention rate of the battery pack after one charge-discharge cycle.

In one embodiment, single cells with low capacity coefficients in the battery pack may also be eliminated.

In one embodiment, the battery packs can also be classified according to the internal resistance. Specifically, the internal resistance of the single cells in the battery pack is collected. Classify the battery pack according to the size of the internal resistance. At the same time, the battery pack can also be graded according to the capacity retention rate and the internal resistance of the battery.

In one embodiment, as shown in FIG. 4 , in step S421 , after obtaining the first discharge capacity in the battery pack, steps S460 to S490 are further included.

Step S460, when the first discharge capacity is less than or equal to the capacity threshold, or the second voltage difference is greater than or equal to the second difference threshold, perform a second charge and discharge cycle on the battery pack.

Step S470, reacquiring the third voltage value of each single battery at the end of discharge in the second charge and discharge cycle.

Step S480, acquiring a plurality of third voltage difference values according to the plurality of third voltage values, and each third voltage difference value is a difference between any two third voltage values.

Step S490, when the third voltage difference satisfies the second preset condition, output the information that the battery pack is to be disassembled.

In this embodiment, by performing charge and discharge cycles on the battery pack again, it is judged that after the first charge and discharge cycle, the re-sorting of batteries that do not meet the output qualification information is avoided, and the accuracy of the simple sorting method is not high. The problem of ensuring the accuracy of battery pack selection.

In one embodiment, as shown in FIG. 5, in step S480, a plurality of third voltage differences are obtained according to a plurality of third voltage values, and each third voltage difference is the difference between any two third voltage values After the value, step S481 and step S491 are also included.

Step S481, acquiring the second discharge capacity in the battery pack.

Wherein, in step S490, when the third voltage difference satisfies the second preset condition, output the information that the battery pack is to be disassembled. include:

Step S491 , when the second discharge capacity is greater than the capacity threshold and the third voltage difference is smaller than the second difference threshold, output the information that the battery pack is to be disassembled.

In this embodiment, when the battery pack is being discharged, the single battery with low capacity will first reach the lower limit protection voltage value, even if there are other single batteries with undischarged capacity, the protection board of the battery pack will also be turned off discharge function. This will cause some single cells to be unable to be fully charged, and some single cells will not be fully charged, resulting in a decline in the performance of the entire battery pack. Therefore, in the present application, it is necessary to recalculate the second discharge capacity of the battery pack during the second charge-discharge cycle, and confirm whether the battery pack can be recycled according to the second discharge capacity.

In one embodiment, in step S461, after acquiring the second discharge capacity in the battery pack, further include:

When the second discharge capacity is less than or equal to the capacity threshold, or the third voltage difference is greater than or equal to the second difference threshold, output battery pack qualification information.

In this embodiment, the battery packs are sorted by judging the static pressure difference of the battery packs, the discharge capacity after two charge-discharge cycles, and the pressure difference at the end of discharge, which can ensure the accuracy of battery pack sorting. .

In one embodiment, step S460, when the first discharge capacity is less than or equal to the capacity threshold, or the second voltage difference is greater than or equal to the second difference threshold, before performing the second charge and discharge cycle on the battery pack, includes:

Step S462, configuring the balanced voltage value for the single cells of the battery pack.

Perform a second charge and discharge cycle on the battery pack, including:

Equalize charging is performed on each single battery according to the equilibrium voltage value, so as to perform the second charge and discharge cycle.

In this embodiment, in order to solve the self-discharge problem caused by the battery pack being left on hold, it is necessary to firstly set the voltage of the battery pack to a certain value, such as 3.5V. To uniformly set the voltage to a certain value, an equalization tester or other setting instruments can be used, as long as the voltage of the single cells in the battery pack can be uniformly adjusted. Used to uniformly charge the battery pack for the second time. In this embodiment, the consistency of the battery pack as a whole can be improved through the single-string equalization method of the equalizer.

In one embodiment, the battery group selection method can be implemented according to the following detailed steps:

(1) Collect the first voltage value of each single cell in the battery pack during the static process, and calculate and obtain the first voltage difference between any two single cells in the plurality of battery packs according to the first voltage value.

(2) Comparing the plurality of first voltage differences in the battery pack with a preset first difference threshold of 100 mV, and performing the next step according to the comparison result. When the first voltage difference is greater than or equal to the first difference threshold 100mV, output the battery pack to be disassembled information; when the first voltage difference is less than the first difference threshold 100mV, perform the first charge and discharge cycle on the battery pack .

(3) After the battery pack performs the first medium-discharge cycle, calculate the first discharge capacity of the battery pack during the first medium-discharge cycle and the process of any two single cells in the battery pack during the first medium-discharge cycle The second voltage difference at the end of discharge.

(4) When the first discharge capacity is greater than the preset capacity threshold and the second voltage difference is less than the preset second difference threshold 650mV, output a prompt message that the battery pack is qualified, and follow the preset method according to the first discharge capacity The grading rules are used for grading. For the specific definition of the grading rules, please refer to other specific embodiments above, and details will not be repeated here. When the second voltage difference is greater than or equal to the second difference threshold 650mV, or the first discharge capacity is less than or equal to the capacity threshold, first set the voltage of the battery pack to 3.5V through a balance tester, and then set the voltage of the battery pack to 3.5V. The group performs the second charge and discharge cycle.

(5) Repeat step (3) to obtain the second discharge capacity and the third voltage difference.

(6) When the second discharge capacity is less than or equal to the capacity threshold, or when the third voltage difference is greater than or equal to the second difference threshold, output the qualified information of the battery pack; and repeat the step (4) above to classify the battery pack . When the second discharge capacity is greater than the capacity threshold and the third voltage difference is smaller than the second difference threshold, output the information that the battery pack is to be disassembled.

It should be understood that although the various steps in the flow charts of FIGS. 1-5 are shown sequentially as indicated by the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in Figures 1-5 may include multiple steps or stages, these steps or stages are not necessarily executed at the same moment, but may be executed at different moments, the execution of these steps or stages The sequence is not necessarily performed sequentially, but may be performed alternately or alternately with other steps or at least a part of steps or stages in other steps.

In one embodiment, as shown in FIG. 6 , a battery pack sorting device 100 is provided, including: an acquisition module 110 , a calculation module 120 and an output module 130 . Wherein: the acquisition module 110 is configured to acquire the first voltage values of each single battery respectively. The calculation module 120 is configured to acquire a plurality of first voltage differences according to the plurality of first voltage values, each first voltage difference being a difference between any two first voltage values. The output module 130 is configured to output the information that the battery pack is to be disassembled when the first voltage difference is greater than or equal to the difference threshold.

For specific limitations on the battery pack sorting device, refer to the above-mentioned limitations on the battery pack sorting method, which will not be repeated here. Each module in the above-mentioned battery pack sorting device can be fully or partially realized by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, and can also be stored in the memory of the computer device in the form of software, so that the processor can invoke and execute the corresponding operations of the above-mentioned modules.

In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure may be as shown in FIG. 7 . The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Wherein, the processor of the computer device is used to provide calculation and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, an operator network, NFC (Near Field Communication) or other technologies. When the computer program is executed by the processor, a battery pack selection method is realized. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covered on the display screen, or a button, a trackball or a touch pad provided on the casing of the computer device , and can also be an external keyboard, touchpad, or mouse.

The computer equipment in the embodiment of the present application is connected with an external battery pack for storing electric power, and both the positive and negative electrodes of the battery pack can come out and receive energy-carrying particles. According to the application scenarios of the battery pack, the battery pack in the embodiment of the present application may include a power battery pack and an energy storage battery pack. It is applied in fields such as energy storage power station, grid-connected renewable energy and micro-grid. Taking the power battery pack as an example, in terms of the type of battery pack, the battery pack can be, but not limited to, a lithium iron phosphate system battery pack or a silicon-added battery pack. The lithium iron phosphate system battery pack is a positive active material containing lithium iron phosphate The lithium-ion battery pack, and the silicon-added system battery pack is a lithium-ion battery pack containing silicon in the negative electrode active material. In terms of the scale of the battery pack, the battery pack may be a single battery cell, or a battery pack module or a battery pack, which is not specifically limited in this embodiment of the present application. The battery pack is logically connected to the processor through a power management system, so as to implement functions such as charging, discharging, and power consumption management through the power management system.

Those skilled in the art can understand that the structure shown in Figure 7 is only a block diagram of a part of the structure related to the solution of this application, and does not constitute a limitation to the computer equipment on which the solution of this application is applied. The specific computer equipment can be More or fewer components than shown in the figures may be included, or some components may be combined, or have a different arrangement of components.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the computer programs can be stored in a non-volatile computer-readable storage medium. , when the computer program is executed, it may include the procedures of the embodiments of the above-mentioned methods. Wherein, any reference to memory, storage, database or other media used in the various embodiments provided in the present application may include at least one of non-volatile memory and volatile memory. The non-volatile memory may include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory or optical memory, and the like. Volatile memory may include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above examples only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent for the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (10)

1. A battery pack selection method is characterized in that, the battery pack is a power battery pack of an electric vehicle, and the battery pack includes a plurality of single cells, and the method comprises: Obtaining the first voltage value of each single battery during the standing process after the battery pack is recovered; Acquiring a plurality of first voltage differences according to the plurality of first voltage values, each of the first voltage differences being the difference between any two first voltage values; When the plurality of first voltage differences are greater than or equal to the first difference threshold, outputting the information that the battery pack is to be disassembled; When any of the first voltage differences is smaller than the first difference threshold, perform a first charge-discharge cycle on the battery pack; A plurality of second voltage differences are obtained according to the second voltage value of each of the single cells at the end of discharge in the first charge-discharge cycle, and each of the second voltage differences is any two of the the difference between the second voltage values; When the first discharge capacity of the battery pack is greater than a capacity threshold and the second voltage difference is smaller than a second difference threshold after the first charge-discharge cycle, output battery pack qualification information. 2. The method according to claim 1, further comprising: When the first discharge capacity is less than or equal to the capacity threshold, or the second voltage difference is greater than or equal to the second difference threshold, perform a second charge-discharge cycle on the battery pack; reacquiring a third voltage value of each of the single cells at the end of discharge in the second charge and discharge cycle; Acquiring a plurality of third voltage differences according to the plurality of third voltage values, each of the third voltage differences being the difference between any two of the third voltage values; When the third voltage difference satisfies the second preset condition, outputting information that the battery pack is to be disassembled. 3. The method according to claim 2, further comprising: After performing the second charge and discharge cycle, obtain the second discharge capacity in the battery pack; When the third voltage difference satisfies the second preset condition, outputting the battery pack to be disassembled information includes: When the second discharge capacity is greater than the capacity threshold and the third voltage difference is smaller than the second difference threshold, outputting information that the battery pack is to be disassembled. 4. The method according to claim 3, further comprising: When the second discharge capacity is less than or equal to the capacity threshold, or the third voltage difference is greater than or equal to the second difference threshold, output battery pack qualification information. 5. The method according to claim 2, characterized in that before performing the second charging and discharging cycle on the battery pack, comprising: Configuring a balanced voltage value for the single cells of the battery pack; The performing the second charging and discharging cycle on the battery pack includes: Perform equalization charging on each of the single cells according to the equalization voltage value, so as to execute the second charge-discharge cycle. 6. A battery pack sorting device, characterized in that, the battery pack is a power battery pack of an electric vehicle, and the battery pack includes a plurality of single cells, and the device includes: The collection module is used to respectively obtain the first voltage value of each single battery during the standing process after the battery pack is recovered; A calculation module, configured to obtain a plurality of first voltage differences according to the plurality of first voltage values, each of the first voltage differences being the difference between any two first voltage values; The battery pack performs the first charge-discharge cycle, and obtains a plurality of second voltage difference values according to the second voltage value of each of the single cells at the end of discharge in the first charge-discharge cycle process, and each of the The second voltage difference is the difference between any two second voltage values; An output module, configured to output battery pack to-be-disassembled information when the plurality of first voltage differences are greater than or equal to a first difference threshold; when any of the first voltage differences is smaller than the first difference threshold, perform the first charge and discharge cycle on the battery pack; when the first discharge capacity of the battery pack is greater than the capacity threshold after the first charge and discharge cycle, and the second voltage difference is less than the second When the difference threshold is reached, the battery pack qualification information is output. 7. The device according to claim 6, wherein the collection module is further configured to re-acquire each of the single cells in the second charging and discharging cycle when the battery pack is charged and discharged for the second time. The third voltage value at the end of discharge in the charge-discharge cycle process; The calculation module is further configured to obtain a plurality of third voltage differences according to the plurality of third voltage values, and each of the third voltage differences is a difference between any two third voltage values ; The output module is further configured to perform the first step on the battery pack when the first discharge capacity is less than or equal to the capacity threshold, or the second voltage difference is greater than or equal to the second difference threshold. Second charge and discharge cycle; when the third voltage difference satisfies the second preset condition, output the information that the battery pack is to be disassembled. 8. The device according to claim 7, wherein the acquisition module is further configured to acquire the second discharge capacity in the battery pack after performing the second charge and discharge cycle; The output module is further configured to output battery pack pending disassembly information when the second discharge capacity is greater than the capacity threshold and the third voltage difference is smaller than the second difference threshold. 9. A computer device, comprising a memory and a processor, the memory stores a computer program, wherein the processor implements the method according to any one of claims 1 to 5 when executing the computer program step. 10. A computer-readable storage medium, on which a computer program is stored, wherein when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are realized.

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