Cell formation retest splicing method and device

Abstract

The invention discloses a cell formation retest splicing method and device, and the method comprises the following steps: S1, setting the charging parameters of a cell in the formation process, the charging parameters comprising the charging current of each charging time stage and the charging duration of each charging time stage, and carrying out the DC charging of the cell according to the charging parameters; s2, when the battery cell is abnormal in the formation process, stopping charging the battery cell, and recording a time point T when the battery cell is abnormal in the formation process; s3, after the abnormity of the battery cell is eliminated, the battery cell is continuously subjected to direct current charging according to residual charging parameters, and the residual charging parameters comprise the direct current charging current corresponding to the time point T and the residual charging duration of the charging time stage corresponding to the time point T, and the direct-current charging current and the charging duration of each subsequent charging time stage corresponding to the time point T. According to the invention, a time cut-off jump direct current charging process is adopted, so that the charging capacity consistency of the battery cell after formation and retest is effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of battery manufacturing, and in particular to a method and device for retesting and connecting a battery cell. Background Art

[0002] The cell formation process is an important step in the battery preparation process, which has a great impact on the capacity, voltage platform, rate performance, high and low temperature discharge performance, storage performance and cycle performance of the battery cell. However, on a large-volume cell formation production line, individual cells will inevitably have abnormal formation alarms. Therefore, it is necessary to remove the cells with abnormal alarms and conduct troubleshooting tests to determine whether the cells with abnormal alarms are normal cells. If the cell is subsequently determined to be a normal cell, the cell needs to be returned for formation retesting. The troubleshooting test is carried out under static conditions. This static process will eliminate the polarization voltage of the cell, thereby affecting the terminal voltage of the cell, resulting in different terminal voltages before and after the formation retest, which in turn leads to differences in the capacity of the cells in the formation retest, affecting the subsequent process of screening out bad cells. Summary of the invention

[0003] The object of the present invention is to provide a method and device for retesting and connecting a battery cell formation, which adopts a DC charging process with time cutoff jump, can effectively ensure the consistency of the charging capacity of the battery cell after retesting, reduce the cost of formation electricity, reduce the detection rate of defective products in the later process, and improve production efficiency.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A method for retesting and connecting a battery cell, comprising the following steps:

[0006] S1: setting charging parameters of the battery cell during the formation process, wherein the charging parameters include the charging current and the charging duration of each charging time stage, and performing direct current charging on the battery cell according to the charging parameters;

[0007] S2: When an abnormality occurs in the battery cell during the formation process, stop charging the battery cell and record the time point T when the abnormality occurs in the battery cell during the formation process;

[0008] S3: After eliminating the abnormality of the battery cell, continue to perform DC charging on the battery cell according to the remaining charging parameters, and the remaining charging parameters include: the DC charging current corresponding to the time point T and the remaining charging time of the charging time stage corresponding to the time point T, and the DC charging current and charging time of each subsequent charging time stage corresponding to the time point T.

[0009] In one embodiment, the method further includes step S4: repeating the above steps S2 and S3 until the formation of the battery cell is completed.

[0010] In one embodiment, the method for obtaining the DC charging current corresponding to the time point T includes:

[0011] Determine the charging time stage to which the time point T belongs, and determine the DC charging current corresponding to the time point T according to the charging time stage to which the time point T belongs and the charging parameters set during the formation process of the battery cell.

[0012] In one embodiment, the method for obtaining the DC charging current corresponding to the time point T includes:

[0013] In the above step S2, when an abnormality occurs in the battery cell during the formation process, the DC charging current I of the battery cell when the abnormality occurs during the formation process is recorded. X , the DC charging current I X That is, the DC charging current corresponding to the time point T.

[0014] In one embodiment, in the above step S1, the total number of charging time stages in the battery cell formation process is set to n, and the battery cell capacity increment after charging in n charging time stages is ΔSOC n , ΔSOC n Between 50% SOC 总 ~90%SOC 总 Among them, SOC 总 is the SOC of the total capacity of the battery cell.

[0015] In one embodiment, ΔSOC n =I1*T1+…+I n *T n ; where n≥2, I n is the DC charging current in the nth charging time stage, T n is the charging time of the nth charging time stage.

[0016] A cell formation retesting and connecting device based on the cell formation retesting and connecting method described above, the cell formation retesting and connecting device comprising:

[0017] A charging module, used for charging the battery cells;

[0018] A parameter setting module, used to set the charging parameters of the battery cell during the formation process, wherein the charging parameters include the DC charging current of each charging time stage and the charging time of each charging time stage;

[0019] A data recording module, used to record the time point T when an abnormality occurs in the battery cell during the formation process;

[0020] A control module, connected to the charging module, the parameter setting module and the data recording module respectively, and the control module is used to control the charging module to charge the battery cell according to the charging parameters;

[0021] When an abnormality occurs in the battery cell during the formation process, after the abnormality of the battery cell is eliminated, the control module controls the charging module to continue to perform direct current charging on the battery cell according to the remaining charging parameters.

[0022] In one embodiment, the control module is further configured to determine the charging time stage to which the time point T belongs, and determine the DC charging current corresponding to the time point T according to the charging time stage to which the time point T belongs.

[0023] In one embodiment, the data recording module is also used to record the DC charging current I when an abnormality occurs in the battery cell during the formation process. X , the DC charging current I X That is, the DC charging current corresponding to the time point T.

[0024] In one embodiment, it further includes:

[0025] The data acquisition module is used to collect charging data of the battery cell during the formation process, and the control module is connected to the data acquisition module; the control module is used to control the charging module to stop charging the battery cell when it is determined that the battery cell is abnormal based on the charging data collected by the data acquisition module.

[0026] In one embodiment, the data acquisition module includes a voltage sensor and / or a temperature sensor, the voltage sensor is used to collect the charging voltage during the battery cell formation process, and the temperature sensor is used to collect the charging temperature during the battery cell formation process; the control module is connected to the voltage sensor and / or the temperature sensor.

[0027] The beneficial effects of the present invention are as follows: in the formation test process, after eliminating the abnormality of the battery cell, the battery cell after the abnormality is eliminated needs to be subjected to formation retesting. During the formation retesting, the battery cell is DC charged according to the remaining charging parameters corresponding to the time point T until the entire formation process of the battery cell is completed. A DC charging process with time cut-off jump is adopted, so that the battery cell capacity before and after the formation retesting does not change, effectively ensuring the consistency of the battery cell charging capacity after the battery cell formation retesting, reducing the formation electricity cost, reducing the OCV defective product detection rate in the later process, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the connection relationship of various modules of the battery cell formation retesting and connecting device of the present invention.

[0029] In the figure: 1. Charging module; 2. Parameter setting module; 3. Data recording module; 4. Control module; 5. Data acquisition module; 51. Voltage sensor; 52. Temperature sensor. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a method for retesting and connecting a battery cell, comprising the following steps:

[0032] S1: setting charging parameters of the battery cell during the formation process, the charging parameters including the charging current and the charging time of each charging time stage, and performing DC charging on the battery cell according to the charging parameters;

[0033] S2: When an abnormality occurs in the battery cell during the formation process, stop charging the battery cell and record the time point T when the abnormality occurs in the battery cell during the formation process;

[0034] S3: After eliminating the abnormality of the battery cell, continue to perform DC charging on the battery cell according to the remaining charging parameters; the remaining charging parameters include: the DC charging current corresponding to the time point T and the remaining charging time of the charging time stage corresponding to the time point T, and the DC charging current and charging time of each subsequent charging time stage corresponding to the time point T.

[0035] In this embodiment, the charging parameters during the battery cell formation process are first set, and then the battery cell is charged according to the set charging parameters; when an abnormality occurs during the battery cell formation process, charging is stopped, and the time point T when the abnormality occurs during the battery cell formation process is recorded; after the abnormality of the battery cell is eliminated, the battery cell is charged according to the remaining charging parameters, that is, the subsequent charging process is continued according to the originally set charging parameters. The cell formation retest and continuation method adopts a DC charging process with a time cutoff jump, so that the cell capacity of the cell will not change before and after the formation retest, and the retest is continued from the time when the cell formation stops abnormally, the retested cell continues the unfinished formation process flow, and the charging capacity of the retested cell is normal; wherein, the voltage of the cell will eliminate the polarization voltage due to the suspension before the retest, so that the terminal voltage of the cell is reduced, if the voltage before the cell abnormally stops is used to continue charging the retested cell, the time required for the retested cell to reach the cutoff voltage will be extended, resulting in an increase in the charging capacity of the retested cell (overcharge), which directly affects the next step of OCV screening of defective products, not only increasing the manual judgment work, but also reducing production efficiency; the present invention can effectively ensure the consistency of the charging capacity of the cell after the cell formation retest, reduce the cost of formation electricity, reduce the detection rate of OCV defective products in the later process, and improve production efficiency.

[0036] As an implementation mode, it also includes step S4, S4: repeating the above steps S2 and S3 until the formation of the battery cell is completed. If the battery cell is abnormal again during the re-testing and charging process, the steps S2 and S3 can be followed again until the formation of the battery cell is completed.

[0037] As an implementation mode, in the above-mentioned step S3, the remaining charging parameters include: the charging current corresponding to the time point T and the remaining charging time of the charging time stage corresponding to the time point T, as well as the charging current and charging time of each subsequent charging time stage corresponding to the time point T. Specifically, after eliminating the abnormality of the battery cell, continue to charge the battery cell according to the remaining charging parameters, first charge the battery cell according to the DC charging current corresponding to the time point T, and the charging time is the remaining charging time of the charging time stage corresponding to the time point T, so that the battery cell can first charge and complete the charging time stage corresponding to the time point T; then charge the battery cell according to the DC charging current and charging time of each subsequent charging time stage of the charging time stage corresponding to the time point T, until all the charging processes are completed; so that the retested battery cell continues the unfinished formation process flow completely according to the original set charging parameters, effectively ensuring the charging capacity of the battery cell after the battery cell formation retest, and the charging capacity of the retested battery cell is normal.

[0038] As an implementation mode, a method for obtaining a DC charging current corresponding to a time point T includes:

[0039] Determine the charging time stage to which the time point T belongs, and determine the DC charging current corresponding to the time point T according to the charging time stage to which the time point T belongs and the charging parameters set during the formation process of the battery cell; that is, according to the charging time stage corresponding to the time point T, the DC charging current of the charging time stage can be queried, which is the DC charging current corresponding to the time point T.

[0040] As an implementation mode, a method for obtaining a DC charging current corresponding to a time point T includes:

[0041] In the above step S2, when an abnormality occurs in the battery cell during the formation process, the DC charging current I when the abnormality occurs in the battery cell during the formation process is recorded. X , DC charging current I X That is the DC charging current corresponding to the time point T.

[0042] As an implementation mode, in the above step S1, the total number of charging time stages in the battery cell formation process is set to n, and the battery cell capacity increment after charging in n charging time stages is ΔSOC n , ΔSOC n Between 50% SOC 总 ~90%SOC 总 Among them, SOC 总 is the SOC of the total capacity of the battery cell, and the total capacity of the battery cell is a known constant value.

[0043] As an embodiment, ΔSOC n =I1*T1+…+I n *T n ; where n≥2, I n is the DC charging current in the nth charging time stage, T n is the charging time of the nth charging time stage.

[0044] Specifically, the specific operation of the formation process in step S1 is as follows: the total cell capacity SOC of the cell 总 The entire charging process of the battery cell is divided into n consecutive charging time stages (n≥2), where each charging time stage is based on the ΔSOC of the battery cell. n Sure;

[0045] In each stage, the corresponding DC charging current (I1, I2, ..., I n ) to charge the battery, wherein the DC charging current in the first charging time stage is I1, and so on, the DC charging current used in the nth charging time stage is I n ;

[0046] The product of the first charging time stage T1 and the DC current I1 of the first charging time stage is equal to the SOC increment ΔSOC1 of the battery cell at the end of the first charging time stage, that is, ΔSOC1=I1*T1;

[0047] For each subsequent charging time stage m (2≤m≤n), the charging time T of this stage is m The DC charging current I m The product of the SOC of the battery cell at the end of the previous stage plus the total SOC increment ΔSOC (m-1) , which is equal to the SOC increment ΔSOC of the cell at the end of this stage m , that is, ΔSOC m =ΔSOC (m-1) +I m *T m ;

[0048] Therefore, ΔSOC n =I1*T1+…+I n *T n .

[0049] Among them, the charging time of each charging time stage (T1, T2, ..., T n ) and DC charging current (I1, I2, ..., I n ) are all charging parameters pre-set in step S1 to ensure a smooth transition from one stage to the next, so that a predetermined ΔSOC is reached after n charging time stages. n .

[0050] For example, ΔSOC is usually predetermined n Between 50% SOC 总 ~90%SOC 总 Taking 80% as an example, it can generally be divided into multiple charging time stages according to experience and needs. For example, after the first charging time stage, the SOC reaches 20%. 总 , after the second charging time stage, it reaches 40% SOC 总 , after the third charging time stage, it reaches 60% SOC 总 and after the fourth charging time stage reaches 80% SOC 总, a total of four stages are used for charging. The DC charging current range is 0.02C-0.33C. Usually, the setting of the DC charging current will gradually increase with the increase of the stages. The minimum DC charging current is adopted in the first charging time stage of charging, and the minimum DC charging current range is 0.02C-0.05C. The use of small DC current charging is to achieve the formation of a stable SEI film on the surface of the negative electrode. The subsequent use of a larger DC current for charging is because the SEI film has been formed, and the large DC current charging promotes the rapid participation of lithium ions in the reaction, saving formation time. Among them, the charging time stage of the battery cell is determined according to the time point T of the abnormal stop in the above S2. When the subsequent S3 formation retest starts from the time point T of this stage, the formation retest charging current is the DC charging current of the charging time stage, and the original formation procedure is followed until the formation retest stops at the last nth charging time stage.

[0051] The present invention also discloses a cell formation retest connection device based on the cell formation retest connection method, such as Figure 1 As shown, the cell formation retest connection device comprises:

[0052] Charging module 1, used for charging the battery cell;

[0053] Parameter setting module 2, used to set the charging parameters of the battery during the formation process, the charging parameters including the DC charging current and the charging time of each charging time stage;

[0054] Data recording module 3, used to record the time point T when an abnormality occurs in the battery cell during the formation process;

[0055] The control module 4 is connected to the charging module 1, the parameter setting module 2 and the data recording module 3 respectively, and the control module 4 is used to control the charging module 1 to charge the battery cell according to the charging parameters;

[0056] When an abnormality occurs in the battery cell during the formation process, after the abnormality of the battery cell is eliminated, the control module 4 controls the charging module 1 to continue charging the battery cell according to the remaining charging parameters; the formed battery cell automatically continues the unfinished remaining charging parameters to ensure the consistency of the battery cell capacity after retesting.

[0057] The remaining charging parameters include: the DC charging current corresponding to the time point T and the remaining charging time of the charging time stage corresponding to the time point T, and the DC charging current and charging time of each subsequent charging time stage corresponding to the time point T.

[0058] As an implementation manner, the control module 4 is further used to determine the charging time stage to which the time point T belongs, and determine the DC charging current corresponding to the time point T according to the charging time stage to which the time point T belongs.

[0059] As an embodiment, the data recording module 3 is also used to record the DC charging current I when an abnormality occurs in the battery cell during the formation process. X , DC charging current I X That is the DC charging current corresponding to the time point T.

[0060] As an implementation method, Figure 1 As shown, the cell formation retest connection device also includes:

[0061] The data acquisition module 5 is used to collect charging data of the battery cell during the formation process. The control module 4 is connected to the data acquisition module 5; the control module 4 is used to control the charging module 1 to stop charging the battery cell when judging that an abnormality occurs in the battery cell based on the charging data collected by the data acquisition module 5.

[0062] As an implementation method, Figure 1 As shown, the data acquisition module 5 includes a voltage sensor 51 and / or a temperature sensor 52. The voltage sensor 51 is used to collect the charging voltage during the battery cell formation process, and the temperature sensor 52 is used to collect the charging temperature during the battery cell formation process; the control module 4 is connected to the voltage sensor 51 and / or the temperature sensor 52. When the battery cell charging voltage measured by the voltage sensor 51 is abnormal, and / or the charging temperature during the battery cell formation process measured by the temperature sensor 52 is abnormal, the abnormal data is transmitted to the control module 4, and the control module 4 determines that the battery cell is abnormal according to the abnormal charging data, and controls the charging module 1 to stop charging the battery cell.

[0063] As an implementation mode, the battery cell formation retest connection device also includes a dummy battery cell placement station, a pairing station, a formation host computer, a manipulator and a formation cabinet, wherein the dummy battery cell placement station is used to place dummy batteries, the pairing station is used to group batteries with similar characteristics, and the manipulator is used to automatically group the batteries to be formed and retested into the formation cabinet for retesting. Specifically, by placing dummy batteries at the dummy battery cell placement station, the continuity of the production line can be maintained, and the efficiency loss caused by waiting for the real batteries can be avoided, while ensuring that the equipment can continue to operate; the pairing station groups batteries with similar characteristics, i.e., batteries with consistent capacity, and the formation retest batteries are automatically grouped by the manipulator, and the battery tray equipped with the retest batteries is placed in a high-temperature static room for heating, and after heating to a set temperature, it is placed in a formation parallel cabinet for retesting. The control module 4 automatically obtains the formation data when the battery cell stops abnormally from the formation host computer, and issues the process flow instructions of the formation retesting to the formation parallel cabinet.

[0064] Beneficial effects of the present invention:

[0065] 1. Constant voltage charging is usually selected for cell formation. During constant voltage charging, the terminal voltage of the cell is the offset voltage generated by the polarization potential of the positive and negative electrodes of the cell. As the charging time increases, the cell capacity continues to increase, the cell polarization voltage will also increase, and the terminal voltage will also increase. When charging stops abnormally, the cell terminal voltage will decrease. When charging continues, due to the decrease in the cell terminal voltage, the time required to charge to the cut-off voltage will be extended, resulting in an increase in the cell charging capacity.

[0066] 2. If the cell is charged with constant current at the cut-off capacity, there is no automatic reconnection process and it is impossible to identify how much power has been charged when it was stopped. Therefore, the capacity cut-off cannot control the charging capacity. Generally, the retest process adopts the voltage cut-off process, which may also result in overcharging due to negativity.

[0067] Therefore, the battery cell formation retesting and connection method and battery cell formation retesting and connection device provided by the present invention adopt a DC charging process with time cut-off jump, which can effectively ensure the consistency of the battery cell charging capacity after formation retesting, reduce the formation electricity cost, reduce the OCV defective product detection rate in the later process, and improve production efficiency.

[0068] Example 1

[0069] A lithium battery with a cell capacity of 125000mAh was used as the experimental object, and it was charged using a DC charging process with time cut-off jump.

[0070] S1: Divide the entire formation charging process into three consecutive charging time stages, and set the charging parameters as follows:

[0071] The node of the first charging time stage is ΔSOC1 = 10% SOC 总 , the DC charging current I1 in this stage is 0.05C (I1 = 125000mAh*0.05C = 6250mA), and the charging time T1 in this stage is 2h. At the end of the first charging time stage, the SOC increment of the battery cell ΔSOC1 = I1*T1 = 6250mA*2h = 12500mAh = 10% SOC 总 ;

[0072] The node of the second charging time stage is ΔSOC2 = 40% SOC 总 , the DC charging current I2 in this stage is 0.1C (I2 = 125000mAh*0.1C = 12500mA), and the charging time T2 in this stage is 3h. At the end of the second charging time stage, the SOC increment of the battery cell is ΔSOC2 = ΔSOC1 + I2*T2 = 10% SOC 总 +I2*T2=10%SOC 总 +12500mA*3h=40%SOC总 ;

[0073] The third charging time stage ends at 80% SOC 总 , the DC charging current I3 in this stage is 0.2C (I3 = 125000mAh*0.2C = 25000mA), and the charging time T3 in this stage is 2h. At the end of the third charging time stage, the SOC increment of the battery cell is ΔSOC3 = ΔSOC2 + I3*T3 = 40% SOC 总 +25000mA*2h=80%SOC 总 .

[0074] S2: The formation process stops due to an abnormal alarm after 1.5 hours in the second charging time stage. The control module 4 obtains the charging parameters of the battery cell when it stops abnormally in the second charging time stage, and records the stop time point as 1.5 hours in the second charging time stage, and the DC charging current I when it stops (i.e., I=I2=125000mAh*0.1C=12500mA);

[0075] S3: After the abnormality of the battery cell is eliminated, the control module 4 issues a formation retest instruction, puts the battery tray with the retested battery cell in a high-temperature static room for heating, and after heating to the set temperature, puts it into a formation cabinet (forming parallel cabinet) for retesting, and uses the remaining charging parameters to charge the battery cell with DC current. The formation retest starts from time point T and continues with the formation test of the second charging time stage. The remaining charging time of the formation test in the second charging time stage is t2=3h-1.5h=1.5h, and the retested DC charging current is I=I2; after the second charging time stage is completed, the formation charging of the third charging time stage is continued until the battery cell is charged to the predetermined 80% SOC 总 .

[0076] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for retesting and connecting a battery cell, characterized in that: The following steps are involved: S1: setting charging parameters of the battery cell during the formation process, wherein the charging parameters include the charging current and the charging duration of each charging time stage, and performing direct current charging on the battery cell according to the charging parameters; S2: When an abnormality occurs in the battery cell during the formation process, stop charging the battery cell, and record the time point T when the abnormality occurs in the battery cell during the formation process; S3: After eliminating the abnormality of the battery cell, continue to perform DC charging on the battery cell according to the remaining charging parameters, and the remaining charging parameters include: the DC charging current corresponding to the time point T and the remaining charging time of the charging time stage corresponding to the time point T, and the DC charging current and charging time of each subsequent charging time stage corresponding to the time point T.

2. The battery cell formation retesting and connection method according to claim 1, characterized in that: The method further comprises step S4: repeating steps S2 and S3 until the formation of the battery cell is completed.

3. The battery cell formation retesting and connection method according to claim 1, characterized in that: The method for obtaining the DC charging current corresponding to the time point T includes: Determine the charging time stage to which the time point T belongs, and determine the DC charging current corresponding to the time point T according to the charging time stage to which the time point T belongs and the charging parameters set during the formation process of the battery cell.

4. The battery cell formation retesting and connection method according to claim 1, characterized in that: The method for obtaining the DC charging current corresponding to the time point T includes: In the above step S2, when an abnormality occurs in the battery cell during the formation process, the DC charging current I of the battery cell when the abnormality occurs during the formation process is recorded. X , the DC charging current I X That is, the DC charging current corresponding to the time point T.

5. The battery cell formation retesting and connection method according to claim 1, characterized in that: In the above step S1, the total number of charging time stages in the battery cell formation process is set to n, and the battery cell capacity increment after charging in n charging time stages is ΔSOC n , ΔSOC n Between 50% SOC 总 ~90%SOC 总 Among them, SOC 总 SOC is the total capacity of the battery cell.

6. The battery cell formation retesting and connection method according to claim 5, characterized in that: ΔSOC n =I1*T1+…+I n *T n ; where n≥2, I n is the DC charging current in the nth charging time stage, T n is the charging time of the nth charging time stage.

7. A cell formation retesting and connecting device based on the cell formation retesting and connecting method as claimed in any one of claims 1 to 6, characterized in that: The battery cell formation retest connection device comprises: A charging module (1), used for charging the battery cell; A parameter setting module (2) is used to set the charging parameters of the battery cell during the formation process, wherein the charging parameters include the direct current charging current in each charging time stage and the charging time in each charging time stage; A data recording module (3), used to record the time point T when an abnormality occurs in the battery cell during the formation process; A control module (4) is connected to the charging module (1), the parameter setting module (2) and the data recording module (3) respectively, and the control module (4) is used to control the charging module (1) to charge the battery cell according to the charging parameters; When an abnormality occurs in the battery cell during the formation process, after the abnormality of the battery cell is eliminated, the control module (4) controls the charging module (1) to continue to perform direct current charging on the battery cell according to the remaining charging parameters.

8. The battery cell formation retesting and connection device according to claim 7, characterized in that: The control module (4) is further used to determine the charging time stage to which the time point T belongs, and according to the charging time stage to which the time point T belongs, determine the DC charging current corresponding to the time point T.

9. The battery cell formation retesting and connection device according to claim 7, characterized in that: The data recording module (3) is also used to record the DC charging current I when an abnormality occurs in the battery cell during the formation process. X , the DC charging current I X That is, the DC charging current corresponding to the time point T.

10. The battery cell formation retesting and connection device according to claim 7, characterized in that: Also includes: The data acquisition module (5) is used to collect charging data of the battery cell during the formation process, and the control module (4) is connected to the data acquisition module (5); the control module (4) is used to control the charging module (1) to stop charging the battery cell when determining that an abnormality has occurred in the battery cell based on the charging data collected by the data acquisition module (5).

11. The battery cell formation retesting and connection device according to claim 10, characterized in that: The data acquisition module (5) comprises a voltage sensor (51) and / or a temperature sensor (52), wherein the voltage sensor (51) is used to acquire the charging voltage during the battery cell formation process, and the temperature sensor (52) is used to acquire the charging temperature during the battery cell formation process; and the control module (4) is connected to the voltage sensor (51) and / or the temperature sensor (52).

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