Formation and capacity grading method and electronic equipment

Abstract

The invention discloses a formation and capacity grading method and electronic equipment. According to the method, the battery cell is controlled to be subjected to formation charging through the first strategy, so that the voltage of the battery cell reaches the limiting voltage, the purpose of shortening the charging time by increasing the cut-off current is achieved, the charging time is shortened, the battery cell can reach a full-charge state, then the battery cell does not need to be subjected to capacity grading charging, and the charging efficiency is improved. Capacity grading discharge is directly carried out; and meanwhile, in a capacity grading discharge stage, controlling the battery cell to carry out capacity grading discharge based on a second strategy so as to enable the voltage of the battery cell to reach a preset cut-off voltage, and after the voltage of the battery cell reaches the cut-off voltage, obtaining a target discharge capacity of the battery cell for capacity grading discharge based on the second strategy, according to the embodiment of the invention, the capacity grading is carried out on the battery cell according to the preset discharge capacity and the target discharge capacity, so that the capacity grading capacity of the battery cell is determined, accurate capacity grading on the battery cell is realized, the time of formation and capacity grading is shortened, the production efficiency of a product is improved, and the production cost of the product is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a formation and capacity grading method and electronic equipment. BACKGROUND

[0002] The soft package lithium ion battery adopts the multi-layer structure of the aluminum plastic film package, which can effectively prevent the leakage of electrolyte, fire or explosion in the battery under the extreme conditions such as internal short circuit, overcharge or overdischarge, thereby the safety of the battery can be significantly improved. However, in the production process of the soft package lithium ion battery, the formation and the capacity grading two processes usually need very long time, which greatly affects the manufacturing efficiency, and further leads to high production cost. SUMMARY

[0003] In view of the defects of the prior art, the present application provides a formation and capacity grading method and electronic equipment, which can greatly shorten the time of battery formation and capacity grading, improve the manufacturing efficiency of the product, and reduce the production cost.

[0004] In a first aspect, the present application provides a formation and capacity grading method, which comprises:

[0005] Based on a preset first strategy, the battery cell is controlled to perform formation charging, so that the voltage of the battery cell reaches a preset limit voltage;

[0006] Based on a preset second strategy, the battery cell is controlled to perform capacity grading discharging, so that the voltage of the battery cell reaches a preset cut-off voltage;

[0007] The target discharging capacity of the battery cell based on the second strategy for capacity grading discharging is obtained;

[0008] The battery cell is graded according to the preset discharging capacity and the target discharging capacity to determine the capacity grading capacity of the battery cell.

[0009] In a second aspect, the present application further provides a formation and capacity grading device, which comprises:

[0010] The first control unit is configured to control the battery cell to perform formation charging based on a preset first strategy, so that the voltage of the battery cell reaches a preset limit voltage;

[0011] The second control unit is configured to control the battery cell to perform capacity grading discharging based on a preset second strategy, so that the voltage of the battery cell reaches a preset cut-off voltage;

[0012] The acquisition unit is configured to obtain the target discharging capacity of the battery cell based on the second strategy for capacity grading discharging;

[0013] The grading unit is configured to grade the battery cell according to the preset discharging capacity and the target discharging capacity to determine the capacity grading capacity of the battery cell.

[0014] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the formation and grading method according to the first aspect when executing the computer program.

[0015] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program, when executed by a processor, causes the processor to execute the formation and grading method according to the first aspect.

[0016] In a fifth aspect, the present application provides a computer program product comprising a computer program or instructions, which, when executed by a processor, implement the formation and grading method according to the first aspect.

[0017] The formation and grading method provided by the present application controls the formation charging of the battery cell through the first strategy, so that the voltage of the battery cell reaches the limit voltage, thereby achieving the purpose of shortening the charging time by increasing the cutoff current, shortening the charging time, and also enabling the battery cell to reach the full charging state, so that the battery cell can directly enter the grading discharge without grading charging. At the same time, during the grading discharge stage, the battery cell is controlled to perform grading discharge based on the second strategy, so that the voltage of the battery cell reaches the preset cutoff voltage, and after the voltage of the battery cell reaches the cutoff voltage, the target discharge capacity of the battery cell based on the second strategy is obtained, and the battery cell is graded according to the preset discharge capacity and the target discharge capacity to determine the grading capacity of the battery cell, thereby achieving accurate grading of the battery cell while shortening the formation and grading time, improving the production efficiency of the product, and reducing the production cost of the product. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The application scenario diagram of the formation and grading method provided by the embodiments of the present application;

[0020] Figure 2 The flowchart of the formation and grading method provided by the embodiments of the present application;

[0021] Figure 3 The schematic block diagram of the formation and grading device provided by the embodiments of the present application;

[0022] Figure 4 The schematic block diagram of the electronic device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0024] It should be understood that, when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise.

[0026] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0027] In addition, in the present application, unless otherwise explicitly specified or limited in the embodiments, the terms "mounting", "connection", "connection" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be a fixed connection, or a detachable connection, or integrated, which can be understood, or can be a mechanical connection, an electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific implementation situation.

[0028] Please refer to Figure 1 , Figure 1 The application scenario diagram of the formation and grading method provided in the embodiments of the present application is shown. The formation and grading method provided in the embodiments of the present application is applied in a control module 101, which can be arranged in a controller or a terminal device. The control module 101 can control a charging and discharging module 102 to realize the formation and grading method provided in the present application.

[0029] It should be noted that the application scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems as new application scenarios appear.

[0030] The formation and capacity grading method provided by the present application will be described in detail below.

[0031] As shown in the method includes the following steps S210-S240. Figure 2

[0032] S210, based on the first strategy, control the formation charging of the battery cell, so that the voltage of the battery cell reaches the preset limit voltage;

[0033] S220, based on the second strategy, control the battery cell to perform capacity grading discharge, so that the voltage of the battery cell reaches the preset cutoff voltage;

[0034] S230, obtaining the target discharge capacity of the battery cell based on the second strategy for capacity grading discharge;

[0035] S240, according to the preset discharge capacity and the target discharge capacity, the battery cell is graded to determine the capacity grading capacity of the battery cell.

[0036] In the present application, the first strategy is the rule information for controlling the formation charging of the battery cell; the first voltage is the highest voltage designed to ensure the safety and service life of the battery cell during the design and use of the battery, that is, the highest voltage that the battery cell can withstand during actual application; The limit voltage is an additional voltage adjustment value based on the voltage designed for the battery cell, and the limit voltage can be understood as the highest voltage that the battery cell can withstand, and the limit voltage can be 4.40V, and the voltage adjustment value can be 0.05V.

[0037] Specifically, by using the first strategy to control the formation charging of the battery cell, the voltage of the battery cell can reach the limit voltage, which realizes the purpose of shortening the charging time by increasing the cutoff current, and also enables the battery cell to reach the full charge state, so that the battery cell can directly enter the capacity grading discharge without capacity grading charging during the subsequent capacity grading process, so as to realize the purpose of integrated formation and capacity grading of the battery cell, thereby shortening the time required for the battery cell in the formation and capacity grading process, improving the efficiency of the formation and capacity grading, and thereby improving the production efficiency of the battery cell.

[0038] Meanwhile, after using the first strategy to control the formation charging of the battery cell to make the voltage of the battery cell reach the limit voltage, the second strategy can be used to control the capacity grading discharge of the battery cell to make the voltage of the battery cell reach the preset cutoff voltage.​

[0039] Specifically, the second strategy is the rule information for controlling the battery cell to perform the capacity grading discharge, and the cut-off voltage can be understood as the lowest voltage designed to ensure the safety and service life of the battery cell in the process of battery design and use, that is, the lowest voltage of the battery cell in the actual application. The cut-off voltage can be 3.0V.

[0040] Further, after the battery cell is controlled to perform the capacity grading discharge by using the second strategy so that the voltage of the battery cell reaches the preset cut-off voltage, the target discharge capacity of the battery cell based on the second strategy can be obtained, and the preset discharge capacity is compared with the target discharge capacity to realize the capacity grading of the battery cell, and then the capacity grading capacity of the battery cell can be determined.

[0041] In the embodiment, the target discharge capacity can be understood as the capacity required to be released when the battery cell is discharged to the preset cut-off voltage by using the second strategy, and the preset discharge capacity can be a capacity set in advance, or can be obtained by the discharge capacities of a plurality of battery cells after the formation charging and the capacity grading discharge of the plurality of battery cells of the same type. The preset discharge capacity can be selected according to actual application, which is not limited in the present application.

[0042] At the same time, the capacity grading capacity of the battery cell refers to the capacity measurement and screening of the battery cell in the process of battery manufacturing through the charge and discharge test, to determine whether the actual capacity meets the design requirements. The main purpose of the capacity grading is to ensure the consistency between the battery cells, so as to improve the overall performance and reliability of the battery pack.

[0043] In some embodiments, based on the preset first strategy, the battery cell is controlled to perform the formation charging so that the voltage of the battery cell reaches the limit voltage, comprising: based on the preset first charging rate, the battery cell is controlled to perform the formation charging so that the voltage of the battery cell reaches the first voltage; the voltage difference between the limit voltage and the first voltage is the voltage adjustment value of the battery cell; after the battery cell is rested for a preset first time, based on the preset second charging rate, the battery cell is controlled to perform the formation charging so that the voltage of the battery cell reaches the limit voltage; the first charging rate is greater than the second charging rate.

[0044] In the present application, in the process of controlling the battery cell to perform the formation charging by using the first strategy so that the voltage of the battery cell reaches the limit voltage, the battery cell can be charged by using a plurality of rates, such as a large rate can be used to charge the battery cell in advance, and then a small rate can be used to charge the battery cell, so as to shorten the time of the formation charging of the battery cell, and at the same time, the voltage of the battery cell can reach the limit voltage.

[0045] Specifically, the first charging rate can be understood as a rate designed on the basis that the maximum rate of the cell material system can be tolerated, for example, the first charging rate can be the maximum rate of the cell material system or the minimum is 1.5C. The second charging rate can be understood as a charging rate that can make the voltage of the cell reach the limit voltage from the first voltage, for example, the second charging rate can be 0.5C, and the first time can be 1 min.

[0046] Meanwhile, the application controls the cell to perform formation charging by using the second charging rate, so that the voltage of the cell reaches the limit voltage, and the cutoff current of the cell is between the first rate threshold and the second rate threshold, the first rate threshold is less than or equal to the second rate threshold, and the second rate threshold is less than the second charging rate. The application controls the cell to perform formation charging by using the second charging rate, so that the voltage of the cell reaches the limit voltage, which can increase the cutoff current, thereby reducing the problem of long charging time caused by small cutoff current, thereby further shortening the time of formation full charging, reducing the entire formation and capacity time, improving the production efficiency of the product, and reducing the manufacturing cost of the product.

[0047] Among them, the first rate threshold can be 0.15C, the second rate threshold can be 0.35C, the first voltage can be 4.35V, and the limit voltage can be 4.40V.

[0048] In some embodiments, before controlling the cell to perform formation charging based on the preset first charging rate so that the voltage of the cell reaches the first voltage, it further includes: based on a preset third charging rate, controlling the cell to perform formation charging within a preset second time to form an SEI film inside the cell; the third charging rate is less than the second charging rate.

[0049] In the application, the third charging rate can be understood as the charging rate required for the cell to obtain a stable SEI film during the formation charging process, the second time can be between 2-5 min, the third charging rate is smaller, which can be 0.1C, that is, less than 0.15C. Specifically, the application controls the cell to perform formation charging according to the third charging rate within the second time, so that the cell can obtain a stable SEI film under a smaller current.

[0050] In some embodiments, controlling the cell to perform formation charging based on the preset second charging rate so that the voltage of the cell reaches the limit voltage includes: based on a preset fourth charging rate, controlling the cell to perform formation charging so that the voltage of the cell reaches the first voltage; the fourth charging rate is less than the first charging rate and greater than the second charging rate; after the cell is stationary for a preset third time, controlling the cell to perform formation charging based on the second charging rate so that the voltage of the cell reaches the limit voltage.

[0051] Specifically, before the battery cell is controlled to perform formation charging based on the second charging rate to make the voltage of the battery cell reach the limit voltage, the battery cell is controlled to perform formation charging based on a fourth charging rate, the fourth charging rate is less than the first charging rate and greater than the second charging rate, so that the battery cell is not damaged and the time for formation charging of the battery cell is shortened, and then the battery cell can be quickly raised to a high state of charge, that is, the battery cell can reach the designed voltage.

[0052] The fourth charging rate is less than the first charging rate and greater than the second charging rate, and the fourth charging rate can be 1C, and the third time can be 1 min.

[0053] It should be noted that the battery cell can be charged at a constant current during formation charging of the battery cell. Meanwhile, during the process of controlling the battery cell to perform formation charging based on the second charging rate to make the voltage of the battery cell reach the limit voltage, the battery cell can be charged at a constant current and a constant voltage.

[0054] In some embodiments, based on a preset second strategy, the battery cell is controlled to perform capacity grading discharge to make the voltage of the battery cell reach a preset cut-off voltage, comprising: based on a preset first discharge rate, the battery cell is controlled to perform capacity grading discharge to make the voltage of the battery cell be a preset second voltage; the second voltage is greater than the cut-off voltage; when the voltage of the battery cell is the second voltage, based on a preset second discharge rate, the battery cell is controlled to perform capacity grading discharge to make the voltage of the battery cell be the cut-off voltage; the second discharge rate is less than the first discharge rate.

[0055] Specifically, during the process of controlling the battery cell to perform capacity grading discharge based on the second strategy to make the voltage of the battery cell reach the cut-off voltage, the battery cell can be discharged at multiple rates, specifically, a large current + a small current combined discharge mode can be used to shorten the discharge time. Large current discharge can shorten the discharge time, and small current discharge can be used at the end of the discharge to extend the discharge time. The reason why the small current is used at the end of the discharge is that large current discharge has a temperature rise, which causes the discharge capacity to be too large, and then small current discharge is used for capacity grading discharge, which can gradually cool down the battery cell during small current discharge, eliminate the capacity deviation caused by temperature, and avoid the problem of premature discharge cut-off voltage caused by current polarization, and then cause the capacity not to be discharged.

[0056] In this application, the cell's discharge range can be between 1C and 2C, the first discharge rate can be between 1C and 2C, and the second discharge rate is less than the first discharge rate, which can be between 0.2C and 0.5C. For example, the first discharge rate can be 2C, and the second discharge rate can be 0.5C. The second discharge rate can be understood as the discharge rate required by the customer.

[0057] Meanwhile, the cutoff voltage can be understood as the minimum voltage after the battery cell has discharged, which can be 3.0V. The second voltage can be between 3.1V and 3.4V, and the second voltage is greater than the cutoff voltage. For example, the second voltage can be 3.4V.

[0058] In some embodiments, controlling the battery cell to perform capacity-gradient discharge based on a preset second discharge rate so that the voltage of the battery cell is the cutoff voltage includes: controlling the battery cell to perform capacity-gradient discharge based on a preset third discharge rate so that the voltage of the battery cell is a preset third voltage; the third voltage is greater than the cutoff voltage and less than the second voltage; the third discharge rate is greater than the second discharge rate and less than the first discharge rate; when the voltage of the battery cell is the third voltage, controlling the battery cell to perform capacity-gradient discharge based on the second discharge rate so that the voltage of the battery cell is the cutoff voltage.

[0059] Specifically, in the process of using the second discharge rate to control the cell to perform capacity grading discharge so that the cell voltage reaches the cutoff voltage, this application can pre-use the third discharge rate to control the cell to perform capacity grading discharge so that the cell voltage is a preset third voltage. The third voltage is greater than the cutoff voltage and less than the second voltage. This can shorten the capacity grading discharge time while avoiding the cell temperature from getting too high, and can also further eliminate the capacity deviation caused by temperature.

[0060] The third discharge rate is less than the first discharge rate but greater than the second discharge rate. The third discharge rate can also be between 1C and 2C. For example, the first discharge rate is 2C, the third discharge rate is 1.0C, and the third voltage can be 3.1V.

[0061] In some embodiments, the cell is controlled to be divided into different capacities based on a preset discharge capacity and a target discharge capacity to determine the capacity of the cell, including: determining a first ratio between the target discharge capacity and the preset discharge capacity and a target threshold; if the first ratio is greater than or equal to the preset first threshold and less than or equal to the preset second threshold, the capacity of the cell is determined based on the target discharge capacity and the target threshold.

[0062] Specifically, in the process of controlling the battery cell according to the preset discharge capacity and the target discharge capacity for grading, the first ratio between the target discharge capacity and the preset discharge capacity and the target threshold can be determined. The target ratio can be a preset ratio, which can be understood as an ideal ratio of the battery cell, that is, the target discharge capacity is equal to the preset discharge capacity. The first ratio can be understood as the actual ratio between the target discharge capacity and the preset discharge capacity.

[0063] Further, after the first ratio and the target threshold are determined, and it is determined that the first ratio is greater than or equal to the first threshold and less than or equal to the second threshold, the grading capacity of the battery cell can be determined according to the target discharge capacity and the target threshold.

[0064] In addition, the target threshold can be obtained by dividing the target discharge capacity of the battery cell after the formation charging and grading discharging provided by the present application by the discharge capacity of the battery cell after the conventional formation grading, removing the discrete values in the plurality of difference values, and then taking the average value.

[0065] For example, if ten identical battery cells are subjected to the formation charging and grading discharging provided by the present application, ten target discharge capacities can be obtained, and the discharge capacity of the battery cell after the conventional formation grading is obtained. Each target discharge capacity is divided by the discharge capacity of the battery cell after the conventional formation grading to obtain a plurality of percentage difference values. After removing the discrete values in the plurality of percentage difference values, the average value of the remaining values is taken to obtain the target threshold. Then, the target discharge capacity of each battery cell is multiplied by the target threshold to obtain the grading capacity of each battery cell.

[0066] In some embodiments, after grading the battery cell according to the preset discharge capacity and the target discharge capacity, the method further comprises: based on a preset third strategy, controlling the battery cell to charge to make the capacity of the battery cell reach the grading capacity.

[0067] In the present application, the third strategy can be understood as a charging strategy that needs to be performed on the battery cell after the formation grading before the battery cell is shipped. By using the third strategy to control the battery cell to charge to make the capacity of the battery cell reach the grading capacity, the voltage dispersion of the battery cell caused by polarization can be eliminated, and compared with the constant voltage and charging time cutoff method, the charging time can be avoided.

[0068] In some embodiments, based on the preset third strategy, the battery cell is controlled to charge to make the capacity of the battery cell reach the grading capacity, which comprises: based on a preset fifth charging rate, the battery cell is controlled to charge, and after a preset fourth time, the battery cell is controlled to charge based on a preset sixth charging rate to make the capacity of the battery cell reach the grading capacity; the fifth charging rate is greater than the sixth charging rate.

[0069] Specifically, in the process of adopting the third strategy to control the power supply of the battery cell to make the capacity of the battery cell reach the capacity of the capacity grading, the large current can be used first to shorten the time, and then the small current can be used for charging to eliminate the polarization caused by the voltage dispersion of the offline battery cell. Compared with the constant voltage and charging time cutoff method for power supply, the time for power supply can be avoided. The fifth charging rate is greater than the sixth charging rate, and the fifth charging rate can be between 1.5C and 3C, which can be set in combination with the material of the battery cell. The sixth charging rate can be between 0.2C and 0.5C.

[0070] In addition, compared with the conventional formation grading, the time and the effect reached by the application can refer to Table 1, Table 2 and Table 3.

[0071] Table 1 Comparison between conventional formation grading and formation grading provided by the application

[0072]

[0073]

[0074] As can be seen from Table 1, the time required for the formation grading method provided by the application is 118 min, while the conventional formation grading requires 410 min. Therefore, compared with the conventional formation grading, the formation grading method provided by the application can greatly shorten the time of formation grading.

[0075] Table 2

[0076] Capacity comparison Capacity of conventional method (Ah) Capacity of this application (Ah) Difference value 1 20.56 20.62 99.7％ 2 20.60 20.65 99.8％ 3 20.62 20.69 99.7％ 4 20.71 20.75 99.8％ 5 20.5 20.61 99.5％ 6 20.54 20.62 99.6％ 7 20.51 20.62 99.5％ 8 20.48 20.55 99.7％ 9 20.75 20.82 99.7％ 10 20.53 20.6 99.7％ Average value 20.58 20.65 99.6％

[0077] As can be seen from Table 2, using the formation grading method provided by the application, the capacity of the battery cell after the final capacity grading is compared with the capacity of the capacity grading in the conventional way, and the difference between the two, i.e. the ratio between the preset discharge capacity and the target discharge capacity, can reach more than 99%. It can be determined that the formation grading method provided by the application can ensure the accuracy of the final capacity grading while shortening the time of formation grading.

[0078] Table 3

[0079]

[0080]

[0081] As can be seen from Table 3, using the formation grading method provided by the application, after the capacity grading discharge of the battery cell, using the power supply method provided by the application, only the voltage dispersion slightly increases, but the sigma value is 0.0028V, which is within the acceptable range of manufacturing.

[0082] In the formation and grading method provided in the embodiments of the present application, the first strategy is used to control the formation charging of the battery cell, so that the voltage of the battery cell reaches the limit voltage, the purpose of shortening the charging time by increasing the cutoff current is achieved, the charging time is shortened, and the battery cell can also reach the full charging state, so that the battery cell does not need to be charged for grading and can directly enter the grading discharge; at the same time, in the grading discharge stage, the second strategy is used to control the grading discharge of the battery cell, so that the voltage of the battery cell reaches the preset cutoff voltage, and after the voltage of the battery cell reaches the cutoff voltage, the target discharge capacity of the battery cell based on the second strategy is obtained, and the battery cell is graded according to the preset discharge capacity and the target discharge capacity to determine the grading capacity of the battery cell, so that the battery cell is accurately graded, the formation and grading time is shortened, the production efficiency of the product is improved, and the production cost of the product is reduced.

[0083] The embodiments of the present application also provide a formation and grading device 300, which is used to execute any one of the foregoing embodiments of the formation and grading method.

[0084] Specifically, please refer to Figure 3 , Figure 3 is a schematic block diagram of the formation and grading device 300 provided in the embodiments of the present application.

[0085] As shown in Figure 3 , the formation and grading device 300 provided in the present application comprises a first control unit 310, a second control unit 320, an acquisition unit 330 and a grading unit 340.

[0086] The first control unit 310 is configured to control the formation charging of the battery cell based on the preset first strategy, so that the voltage of the battery cell reaches the limit voltage; the second control unit 320 is configured to control the grading discharge of the battery cell based on the preset second strategy, so that the voltage of the battery cell reaches the preset cutoff voltage; the acquisition unit 330 is configured to acquire the target discharge capacity of the battery cell based on the second strategy; and the grading unit 340 is configured to grade the battery cell according to the preset discharge capacity and the target discharge capacity to determine the grading capacity of the battery cell.

[0087] The formation and grading device 300 provided in the embodiments of the present application can control the electric core to perform formation charging through the first strategy, so that the voltage of the electric core reaches the limit voltage, and the purpose of shortening the charging time by increasing the cutoff current is achieved, the charging time is shortened, and the electric core can also reach the full charging state, so that the electric core does not need to be charged for grading and can directly enter the grading discharge; at the same time, during the grading discharge stage, the electric core is controlled to perform grading discharge based on the second strategy, so that the voltage of the electric core reaches the preset cutoff voltage, and after the voltage of the electric core reaches the cutoff voltage, the target discharge capacity of the electric core based on the second strategy is obtained, and the electric core is graded according to the preset discharge capacity and the target discharge capacity to determine the grading capacity of the electric core, so that the electric core is accurately graded, the formation and grading time is shortened, the production efficiency of the product is improved, and the production cost of the product is reduced.

[0088] It should be noted that the specific implementation process of the formation and grading device 300 and each unit can be clearly understood by those skilled in the art, and can refer to the corresponding description in the foregoing method embodiments. For the convenience and brevity of description, it will not be repeated here.

[0089] The formation and grading device 300 can be implemented in the form of a computer program, which can run on an electronic device as shown in the figure. Figure 4

[0090] Please refer to Figure 4 , Figure 4 is a schematic block diagram of an electronic device provided in the embodiments of the present application.

[0091] Please refer to Figure 4 , the device 400 includes a processor 402, a memory and a network interface 405 connected through a system bus 401, wherein the memory can include a storage medium 403 and an internal memory 404.

[0092] The storage medium 403 can store an operating system 4031 and a computer program 4032. The computer program 4032 is executed to make the processor 402 perform the formation and grading method.

[0093] The processor 402 is used to provide computing and control capabilities to support the operation of the entire device 400.

[0094] The internal memory 404 provides an environment for the running of the computer program 4032 in the non-volatile storage medium 403, and the computer program 4032 is executed by the processor 402 to make the processor 402 perform the formation and grading method.

[0095] The network interface 405 is used for network communication, such as providing transmission of data information. Those skilled in the art can understand that,​Figure 4 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the device 400 to which the scheme of the present application is applied. Specifically, the device 400 can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0096] The processor 402 is configured to run the computer program 4032 stored in the memory to perform the following functions: based on a preset first strategy, control the battery cell to perform formation charging, so that the voltage of the battery cell reaches a limit voltage; based on a preset second strategy, control the battery cell to perform capacity grading discharge, so that the voltage of the battery cell reaches a preset cut-off voltage; obtain a target discharge capacity of the battery cell based on the second strategy for capacity grading discharge; and perform capacity grading on the battery cell according to a preset discharge capacity and the target discharge capacity, to determine a capacity grading capacity of the battery cell.

[0097] Those skilled in the art can understand that Figure 4 The embodiments of the device 400 shown in the figure do not constitute a limitation on the specific constitution of the device 400. In other embodiments, the device 400 can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement. For example, in some embodiments, the device 400 can only include the memory and the processor 402. In such embodiments, the structure and functions of the memory and the processor 402 are consistent with those of the memory and the processor 402 shown in the embodiments, and will not be described here again. ​ The embodiments of the device 400 shown in the figure do not constitute a limitation on the specific constitution of the device 400. In other embodiments, the device 400 can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement. For example, in some embodiments, the device 400 can only include the memory and the processor 402. In such embodiments, the structure and functions of the memory and the processor 402 are consistent with those of the memory and the processor 402 shown in the embodiments, and will not be described here again.

[0098] It should be understood that, in the embodiments of the present application, the processor 402 can be a central processing unit (CPU), and the processor 402 can also be other general-purpose processors 402, digital signal processors 402 (DSP), application specific integrated circuits (ASIC), ready programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor 402 can be a microprocessor or any conventional processor.

[0099] According to an aspect of the present application, a computer program product or computer program is also provided, which comprises computer instructions stored in a computer readable storage medium. A processor of an electronic device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions to cause the electronic device to perform the following steps: based on a preset first strategy, control the battery cell to perform formation charging so that the voltage of the battery cell reaches a limit voltage; based on a preset second strategy, control the battery cell to perform capacity grading discharging so that the voltage of the battery cell reaches a preset cut-off voltage; obtain a target discharging capacity of the battery cell based on the second strategy; and perform capacity grading on the battery cell according to a preset discharging capacity and the target discharging capacity to determine a capacity grading capacity of the battery cell.

[0100] It can be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program comprises program instructions, and the computer program can be stored in a storage medium, which is a computer readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the process steps of the above-mentioned embodiments.

[0101] In another embodiment of the present application, a computer storage medium is provided. The storage medium can be a non-volatile computer readable storage medium or a volatile storage medium. The storage medium stores a computer program 4032, wherein the computer program 4032 is executed by a processor 402 to implement the following steps: based on a preset first strategy, control the battery cell to perform formation charging so that the voltage of the battery cell reaches a limit voltage; based on a preset second strategy, control the battery cell to perform capacity grading discharging so that the voltage of the battery cell reaches a preset cut-off voltage; obtain a target discharging capacity of the battery cell based on the second strategy; and perform capacity grading on the battery cell according to a preset discharging capacity and the target discharging capacity to determine a capacity grading capacity of the battery cell.

[0102] The storage medium can be a U disk, a mobile hard disk, a read-only memory (ROM), a magnetic disk or an optical disk, and various computer readable storage media that can store program codes.

[0103] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in general terms in the above description. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0104] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is only a logical function division, and actual implementation can have another division manner. For example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed.

[0105] The steps in the method embodiments of the present application can be adjusted, combined and reduced in sequence according to actual needs. The units in the apparatus embodiments of the present application can be combined, divided and reduced according to actual needs. In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0106] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art, or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions to make an electronic device (which can be a personal computer, terminal or network device, etc.) execute all or part of the steps of the method provided by each embodiment of the present application.

[0107] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for chemical separation and compatibilization, characterized in that, include: Based on a preset first strategy, the battery cell is controlled to undergo formation charging so that the voltage of the battery cell reaches a preset limit voltage. Based on a preset second strategy, the battery cell is controlled to perform capacity-limited discharge so that the voltage of the battery cell reaches a preset cutoff voltage. Obtain the target discharge capacity of the battery cell based on the second strategy for capacity-controlled discharge. The battery cell is divided into different capacity groups based on the preset discharge capacity and the target discharge capacity to determine the capacity group of the battery cell.

2. The method for forming and compatibilizing according to claim 1, characterized in that, The method of controlling the battery cell to undergo formation charging based on a preset first strategy, so that the voltage of the battery cell reaches a limit voltage, includes: Based on a preset first charging rate, the battery cell is controlled to undergo formation charging so that the voltage of the battery cell reaches a preset first voltage; the voltage difference between the limiting voltage and the first voltage is the voltage adjustment value of the battery cell. After the battery cell has been left to stand for a preset first time, the battery cell is controlled to undergo formation charging based on a preset second charging rate, so that the voltage of the battery cell reaches the limit voltage; the first charging rate is greater than the second charging rate.

3. The method for forming and dissolving components according to claim 2, characterized in that, Before controlling the battery cell to undergo formation charging based on a preset first charging rate so that the voltage of the battery cell reaches a preset first voltage, the method further includes: Within a preset second time period, based on a preset third charging rate, the battery cell is controlled to undergo formation charging so that an SEI film is formed inside the battery cell; the third charging rate is less than the second charging rate.

4. The method for forming and dissolving according to claim 2, characterized in that, The step of controlling the battery cell to undergo formation charging based on a preset second charging rate, so that the voltage of the battery cell reaches the limiting voltage, includes: Based on a preset fourth charging rate, the battery cell is controlled to undergo formation charging so that the voltage of the battery cell reaches the first voltage; the fourth charging rate is less than the first charging rate and greater than the second charging rate. After the battery cell has been left to stand for a preset third time, the battery cell is controlled to undergo formation charging based on the second charging rate, so that the voltage of the battery cell reaches the limit voltage.

5. The method for chemical composition and compatibilization according to any one of claims 1-4, characterized in that, The second strategy, based on a preset parameters, controls the battery cell to undergo capacity-gradient discharge so that the voltage of the battery cell reaches a preset cutoff voltage, including: Based on a preset first discharge rate, the battery cell is controlled to undergo capacity-divided discharge so that the voltage of the battery cell is a preset second voltage; the second voltage is greater than the cutoff voltage. When the voltage of the battery cell is the second voltage, the battery cell is controlled to perform capacity-limited discharge based on a preset second discharge rate so that the voltage of the battery cell is the cutoff voltage; the second discharge rate is less than the first discharge rate.

6. The method for forming and compatibilizing according to claim 5, characterized in that, The step of controlling the battery cell to perform capacity-gradient discharge based on a preset second discharge rate, so that the voltage of the battery cell is the cutoff voltage, includes: Based on a preset third discharge rate, the battery cell is controlled to perform capacity-divided discharge so that the voltage of the battery cell is a preset third voltage; the third voltage is greater than the cutoff voltage and less than the second voltage; the third discharge rate is greater than the second discharge rate and less than the first discharge rate. When the voltage of the battery cell is the third voltage, the battery cell is controlled to perform capacity-limited discharge based on the second discharge rate, so that the voltage of the battery cell is the cutoff voltage.

7. The method for chemical composition and compatibility building according to any one of claims 1-4, characterized in that, The step of controlling the cell to perform capacity grading based on the preset discharge capacity and the target discharge capacity to determine the capacity grading capacity of the cell includes: Determine a first ratio between the target discharge capacity and the preset discharge capacity, and a target threshold. If the first ratio is greater than or equal to a preset first threshold and less than or equal to a preset second threshold, the capacity of the battery cell is determined based on the target discharge capacity and the target threshold.

8. The method for chemical composition and compatibilization according to any one of claims 1-4, characterized in that, After classifying the battery cells according to the preset discharge capacity and the target discharge capacity, the method further includes: Based on a preset third strategy, the battery cell is controlled to be recharged so that the battery cell's capacity reaches the specified capacity.

9. The method for forming and compatibilizing according to claim 8, characterized in that, The third strategy, based on a preset parameters, controls the battery cell to be recharged so that the battery cell's capacity reaches the specified capacity, including: Based on a preset fifth charging rate, the battery cell is controlled to charge, and after a preset fourth time, the battery cell is charged based on a preset sixth charging rate so that the battery cell's capacity reaches the specified capacity; the fifth charging rate is greater than the sixth charging rate.

10. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the decomposition and compatibilization method according to any one of claims 1 to 9.

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