Battery cell forming processing method and lithium battery cell

Abstract

The present application provides a cell formation processing method and a lithium battery cell. The method includes performing an aging treatment on the cell to be processed to obtain a first cell; performing a formation and liquid extraction treatment on the first cell to obtain a second cell; and performing a liquid replenishment treatment on the second cell to obtain a lithium battery cell, wherein the electrolyte in the liquid replenishment treatment includes the electrolyte extracted in the formation and liquid extraction treatment. The cell is first subjected to an aging treatment to obtain an aged first cell, and then the first cell is subjected to formation and liquid extraction operations to facilitate the formation of the first cell, thereby facilitating the extraction of the electrolyte in the gas generated during the formation of the first cell, and finally the extracted electrolyte is added to the second cell as the liquid in the liquid replenishment operation, so that when the electrolyte content in the processed lithium battery cell reaches the specified standard, the waste of the electrolyte extracted during the formation process is avoided, and the production cost of the lithium battery cell is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cells, and in particular to a battery cell forming processing method and a lithium battery cell. Background Art

[0002] With the development of the battery cell industry, the number of battery cell manufacturing plants has continued to grow, and the manufacturing of each battery cell is inseparable from the separate formation process. The formation process is accompanied by the decomposition of the electrolyte, forming an SEI film (solid electrolyte film) on the surface of the negative electrode. During the decomposition process, a large amount of gas is generated. In order to avoid affecting the performance of the battery cell during this process, it is necessary to timely pump out the negative pressure to discharge the gas. The discharge process will inevitably draw out some electrolyte, for example, the Chinese patent application number is CN201711430774.8.

[0003] However, in the process of mass production of battery cells, the number of battery cells continues to increase, and the extracted electrolyte is either directly scrapped or recycled outside the factory, which will cause economic losses and bring huge pressure on environmental pollution. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a battery cell forming processing method and a lithium battery cell that effectively reduce production costs.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A battery cell forming processing method, the method comprising:

[0007] Performing aging treatment on the battery cell to be processed to obtain a first battery cell;

[0008] Performing a formation and liquid extraction process on the first battery cell to obtain a second battery cell;

[0009] The second battery cell is subjected to a liquid replenishment treatment to obtain a lithium battery cell, wherein the electrolyte in the liquid replenishment treatment includes the electrolyte extracted in the formation liquid extraction treatment.

[0010] In one embodiment, the aging treatment of the battery cell to be processed to obtain the first battery cell includes: placing the battery cell to be processed in an aging box to perform an aging process on the battery cell to be processed to obtain the first battery cell.

[0011] In one embodiment, the aging treatment includes atmospheric pressure aging.

[0012] In one embodiment, the aging treatment includes negative pressure aging.

[0013] In one embodiment, the negative pressure of the negative pressure aging is -30KPa to 100KPa.

[0014] In one embodiment, the first battery cell is subjected to a formation and liquid extraction process to obtain a second battery cell, comprising: placing the first battery cell in a formation box to perform a formation process and a negative pressure liquid extraction process on the first battery cell to obtain the second battery cell and the extracted electrolytic aerosol to be replenished.

[0015] In one embodiment, the first battery cell is placed in a formation box to perform a formation process and a negative pressure liquid extraction process on the first battery cell to obtain the second battery cell and the extracted electrolyte aerosol to be replenished, and then further includes: filtering the electrolyte aerosol to be replenished to obtain the electrolyte to be replenished for replenishing the second battery cell.

[0016] In one embodiment, the formation temperature of the formation process is 30°C to 90°C.

[0017] In one embodiment, the negative pressure of the negative pressure liquid extraction process is -40KPa to 100KPa.

[0018] A lithium battery cell is prepared by the cell formation processing method described in any one of the above embodiments.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] First, the battery cell is aged to obtain an aged first battery cell, and then the first battery cell is subjected to formation and liquid extraction operations, so as to facilitate the formation of the first battery cell, thereby facilitating the extraction of electrolyte in the gas generated during the formation of the first battery cell, and finally the extracted electrolyte is replenished into the second battery cell as liquid in the liquid replenishment operation, so that when the electrolyte content in the processed lithium battery cell reaches a specified standard, the waste of the electrolyte extracted during the formation process is avoided, and the production cost of the lithium battery cell is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Flowchart of a battery cell forming method in one embodiment;

[0023] Figure 2 for Figure 1A flow chart of a specific embodiment of a battery cell forming method is shown;

[0024] Figure 3 for Figure 1 A flow chart of another specific embodiment of the battery cell forming method shown;

[0025] Figure 4 for Figure 1 A flow chart of another specific embodiment of a battery cell forming method is shown. DETAILED DESCRIPTION

[0026] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] The present invention relates to a battery cell forming processing method. In one embodiment, the battery cell forming processing method includes performing an aging treatment on a battery cell to be processed to obtain a first battery cell; performing a forming and liquid extraction treatment on the first battery cell to obtain a second battery cell; and performing a liquid replenishment treatment on the second battery cell to obtain a lithium battery cell, wherein the electrolyte in the liquid replenishment treatment includes the electrolyte extracted in the forming and liquid extraction treatment. The battery cell is first subjected to an aging treatment to obtain an aged first battery cell, and then the first battery cell is subjected to a forming and liquid extraction operation to facilitate the formation of the first battery cell, thereby facilitating the extraction of the electrolyte in the gas generated during the formation of the first battery cell. Finally, the extracted electrolyte is supplemented into the second battery cell as the liquid in the liquid replenishment operation, so that when the electrolyte content in the processed lithium battery cell reaches a specified standard, the waste of the electrolyte extracted during the formation process is avoided, effectively reducing the production cost of the lithium battery cell.

[0030] See also Figure 1 , which is a flow chart of a battery cell forming method according to an embodiment of the present invention. The battery cell forming method includes some or all of the following steps.

[0031] S100: performing aging treatment on the battery cell to be processed to obtain a first battery cell.

[0032] In this embodiment, the battery cell to be processed serves as the initial battery cell for processing the lithium battery cell, and the aging treatment is performed on the battery cell to be processed, that is, the aging operation is performed on the structure of the battery cell to be processed so that the overall structure of the battery cell to be processed is aged, which is convenient for pre-treatment of the battery cell before formation, so that the overall structure of the first battery cell after aging has the prerequisite structural conditions for formation, thereby facilitating the processing of the battery cell to be processed into the various hardware states required before formation, and further facilitating the subsequent formation of the battery cell to obtain the required lithium battery cell.

[0033] S200: performing a formation and liquid extraction process on the first battery cell to obtain a second battery cell.

[0034] In this embodiment, the first battery cell is formed based on the battery cell to be processed, and the battery cell to be processed serves as the initial battery cell for processing the lithium battery cell. The battery cell to be processed is subjected to an aging treatment, which is to perform an aging operation on the structure of the battery cell to be processed so that the overall structure of the battery cell to be processed ages, and is convenient for pre-treatment of the battery cell before formation, so that the overall structure of the aged first battery cell has the prerequisite structural conditions for formation, thereby facilitating the processing of the battery cell to be processed into the various hardware states required before formation, and further facilitating the subsequent formation of the battery cell to obtain the required lithium battery cell. The first battery cell is subjected to a formation liquid extraction treatment, which is to perform a formation operation process and an electrolyte extraction operation process on the first battery cell so as to collect the electrolyte carried in the gas discharged during the formation process of the first battery cell. Specifically, when extracting the gas generated during the formation process of the first battery cell, the electrolyte mixed in the gas is promptly stripped off to avoid wasting the extracted electrolyte.

[0035] S300: performing a liquid replenishing treatment on the second battery cell to obtain a lithium battery cell, wherein the electrolyte in the liquid replenishing treatment includes the electrolyte extracted in the formation liquid extraction treatment.

[0036] In this embodiment, the second battery cell is the battery cell after the first battery cell has been subjected to formation treatment, and the first battery cell is formed based on the battery cell to be processed, and the battery cell to be processed serves as the initial battery cell for processing the lithium battery cell. The aging treatment of the battery cell to be processed is to perform an aging operation on the structure of the battery cell to be processed so that the overall structure of the battery cell to be processed is aged, which is convenient for pre-treatment of the battery cell before formation, so that the overall structure of the aged first battery cell has the prerequisite structural conditions for formation, thereby facilitating the processing of the battery cell to be processed into various hardware states required before formation, and further facilitating the subsequent formation of the battery cell to obtain the required lithium battery cell. The first battery cell is subjected to a formation and liquid extraction process, which involves performing a formation operation process and an electrolyte extraction operation process on the first battery cell, so as to collect the electrolyte carried in the gas discharged during the formation process of the first battery cell. Specifically, when extracting the gas generated during the formation process of the first battery cell, the electrolyte mixed in the gas is promptly stripped off, so as to replenish the electrolyte in the extracted gas into the battery cell, so that part of the electrolyte used by the lithium battery cell comes from the initial electrolyte, thereby reducing the amount of new electrolyte required for the replenishment of the lithium battery cell. In this way, while ensuring the content of the electrolyte in the lithium battery cell, the waste of electrolyte can also be reduced, effectively reducing the manufacturing cost of the lithium battery cell.

[0037] In the above embodiment, the battery cell is first aged to obtain an aged first battery cell, and then the first battery cell is subjected to formation and liquid extraction operations, which facilitates the formation of the first battery cell, thereby facilitating the extraction of the electrolyte in the gas generated during the formation of the first battery cell, and finally the extracted electrolyte is replenished into the second battery cell as the liquid in the liquid replenishment operation, so that when the electrolyte content in the processed lithium battery cell reaches the specified standard, the waste of the electrolyte extracted during the formation process is avoided, and the production cost of the lithium battery cell is effectively reduced.

[0038] In one embodiment, the aging treatment of the battery cell to be processed to obtain the first battery cell includes: placing the battery cell to be processed in an aging box to perform an aging process on the battery cell to be processed to obtain the first battery cell. In this embodiment, the battery cell to be processed serves as the initial battery cell for processing the lithium battery cell, and the aging treatment of the battery cell to be processed is to perform an aging operation on the structure of the battery cell to be processed so that the overall structure of the battery cell to be processed is aged, which facilitates the pre-processing of the battery cell before formation, so that the overall structure of the aged first battery cell has the prerequisite structural conditions for formation, thereby facilitating the processing of the battery cell to be processed into the various hardware states required before formation, and further facilitating the subsequent formation of the battery cell to obtain the desired lithium battery cell. The cells to be processed first pass through the aging chamber, where they undergo a specified aging process. For example, the cells to be processed are aged under a predetermined aging condition, resulting in an aged cell, thereby making the overall structure of the first cell suitable for subsequent formation processes. Specifically, after aging, the cells to be processed are fully infiltrated with electrolyte, which facilitates accelerated gas production and electrolyte decomposition during the subsequent formation process. In another embodiment, the aging process includes normal pressure aging, i.e., the aging pressure within the aging chamber is normal atmospheric pressure, so that the cells to be processed are aged at normal pressure to meet the aging conditions of the cells under normal pressure. In another embodiment, the aging process includes negative pressure aging, i.e., the aging pressure within the aging chamber is lower than normal atmospheric pressure, for example, the negative pressure of the negative pressure aging process is between -30 kPa and 100 kPa, and the aging temperature is between 30°C and 90°C, so that the cells to be processed are aged under negative pressure to meet the aging conditions of the cells under different pressures.

[0039] In one embodiment, the first battery cell is subjected to a formation and liquid extraction process to obtain a second battery cell, comprising: placing the first battery cell in a formation box to perform a formation process and a negative pressure liquid extraction process on the first battery cell to obtain the second battery cell and the extracted electrolytic aerosol to be replenished. In this embodiment, the first battery cell is formed based on the battery cell to be processed, and the battery cell to be processed serves as the initial battery cell for processing the lithium battery cell. The aging process of the battery cell to be processed is to perform an aging operation on the structure of the battery cell to be processed so that the overall structure of the battery cell to be processed is aged, which facilitates the pre-treatment of the battery cell before formation, so that the overall structure of the aged first battery cell has the prerequisite structural conditions for formation, thereby facilitating the processing of the battery cell to be processed into the various hardware states required before formation, and further facilitating the subsequent formation of the battery cell to obtain the required lithium battery cell. The first battery cell is subjected to a formation and liquid extraction process, which is to perform a formation operation process and an electrolyte extraction operation process on the first battery cell, so as to collect the electrolyte carried in the gas discharged during the formation process of the first battery cell. Specifically, when extracting the gas generated during the formation process of the first battery cell, the electrolyte mixed in these gases is promptly stripped off to avoid wasting the extracted electrolyte. The first battery cell is a battery cell formed after passing through the aging box. After the aging operation, the first battery cell enters the formation box to perform a formation operation process on the first battery cell, thereby performing battery formation on the first battery cell to accelerate the activation of the active material in the battery cell, so as to facilitate the subsequent capacity division of the first battery cell to form a lithium battery cell that meets the requirements. When the first battery cell is being formed, the gas generated during the formation process is also extracted. The extracted gas is mixed with a certain amount of electrolyte and discharged in the form of an aerosol, so as to obtain a second battery cell after the formation treatment. The electrolyte in the gas is extracted under negative pressure, so that the electrolyte to be replenished can be subsequently replenished into the battery cell as a new electrolyte.

[0040] Furthermore, the first battery cell is placed in a formation box to perform a formation process and a negative pressure liquid extraction process on the first battery cell to obtain the second battery cell and the extracted electrolyte aerosol to be replenished, and then further includes: filtering the electrolyte aerosol to be replenished to obtain the electrolyte to be replenished for replenishing the second battery cell. In this embodiment, the first battery cell is formed based on the battery cell to be processed, and the battery cell to be processed serves as the initial battery cell for processing the lithium battery cell. The battery cell to be processed is subjected to an aging process, which is an aging operation on the structure of the battery cell to be processed so that the overall structure of the battery cell to be processed is aged, which facilitates the pre-treatment of the battery cell before formation, so that the overall structure of the aged first battery cell has the prerequisite structural conditions for formation, thereby facilitating the processing of the battery cell to be processed into the various hardware states required before formation, and further facilitating the subsequent formation of the battery cell to obtain the required lithium battery cell. The first battery cell is subjected to a formation and liquid extraction process, which is to perform a formation operation process and an electrolyte extraction operation process on the first battery cell, so as to collect the electrolyte carried in the gas discharged during the formation process of the first battery cell. Specifically, when extracting the gas generated during the formation process of the first battery cell, the electrolyte mixed in these gases is promptly stripped off to avoid wasting the extracted electrolyte. The first battery cell is a battery cell formed after passing through the aging box. After the aging operation, the first battery cell enters the formation box to perform a formation operation process on the first battery cell, thereby performing battery formation on the first battery cell to accelerate the activation of the active material in the battery cell, so as to facilitate the subsequent capacity division of the first battery cell to form a lithium battery cell that meets the requirements. When the first battery cell is formed, the gas generated during the formation process is also extracted. A certain amount of electrolyte is mixed in the extracted gas and discharged in the form of an aerosol, so as to obtain a second battery cell after the formation process, and the electrolyte in the gas extracted by negative pressure, that is, the electrolyte to be replenished, so that the electrolyte to be replenished can be replenished into the battery cell as a new electrolyte later. Wherein, the electrolyte to be replenished is stripped from the extracted gas. For example, the electrolyte aerosol to be replenished is passed through a filter to filter out the electrolyte in the extracted gas, so as to form the electrolyte to be replenished for replenishing the second battery cell, thereby facilitating the recovery of the electrolyte that comes out of the gas in the first battery cell, thereby avoiding the waste of electrolyte. In another embodiment, the formation temperature of the formation process is 30°C to 90°C, the formation negative pressure of the negative pressure extraction process is -40Kpa to 100Kpa, and the formation charge and discharge current of the negative pressure extraction process is 0.01C to 0.2C.

[0041] During the actual formation process of the battery cell, the second battery cell, which is formed after the first battery cell undergoes formation treatment, needs to be refilled with the electrolyte decomposed in the second battery cell during the formation process to replenish the electrolyte content in the second battery cell, thereby restoring the total electrolyte content of the lithium battery cell to an optimal state, and thus ensuring that the capacity retention rate of the lithium battery cell meets the requirements. However, before the rehydration process, the formation treatment decomposes the electrolyte in the second battery cell, which directly affects the capacity of the final product and easily increases the probability of the lithium battery cell being unqualified.

[0042] In order to improve the capacity retention rate of the lithium battery cell, the second cell is subjected to a liquid replenishing treatment to obtain a lithium battery cell, which also includes the following steps:

[0043] Obtaining the electrode material type of the second battery cell;

[0044] Detecting whether the electrode material type matches the preset material type;

[0045] When the electrode material type matches the preset material type, the second battery cell is moved back to the aging box to perform a secondary aging treatment on the second battery cell.

[0046] In this embodiment, the electrode material type is the material type of any one of the positive and negative electrodes of the second battery cell, that is, the electrode material type is the model corresponding to the electrode material of the second battery cell, that is, the electrode material type corresponds to the material type of the second battery cell. Since the current collector on the electrode of the second battery cell is in direct contact with the internal electrolyte, the electrode material type of the second battery cell determines the decomposition speed of the electrolyte during the formation process. The electrode material of the second battery cell directly affects the content of the electrolyte after extraction, thereby affecting the capacity retention rate of the lithium battery cell. The electrode material type matches the preset material type, indicating that the electrode material type of the second battery cell is the same as the standard electrode material type, that is, the decomposition rate of the electrode material of the second battery cell after contact with the electrolyte during formation is faster. At this time, the second battery cell is moved back to the aging box to perform a secondary aging treatment on the second battery cell, which is to perform an aging operation on the second battery cell again. See the attached for details. Figure 2, so as to improve the wettability between the electrolyte in the second battery cell and the current collector on the electrode. Moreover, after the second battery cell is aged again, the active substances in the positive and negative electrode materials of the second battery cell are stabilized faster, that is, the electrochemical performance of the second battery cell is quickly stabilized, thereby stabilizing the battery performance of the second battery cell and further stabilizing the electrolyte capacity in the second battery cell. In this way, before rehydration, the second battery cell with the specified electrode material is aged a second time to lock the electrolyte in the second battery cell, preventing excessive electrolyte from being extracted with the gas generated during the formation process, and effectively improving the capacity retention rate of the lithium battery cell. Specific embodiments can be seen in Table 1 below.

[0047] Table 1

[0048]

[0049]

[0050] As shown in Table 1, under the specified electrode materials, Example 1, after undergoing a further aging treatment before rehydration, exhibited a higher capacity retention rate than both Examples 2 and 3, effectively improving the capacity retention rate of the lithium battery cell. In one embodiment, the electrode materials were high-density iron-lithium and graphite. In another embodiment, the electrode materials were medium-density iron-lithium graphite. In another embodiment, the electrode materials were high-density ternary and graphite. In another embodiment, the electrode materials were medium-density ternary graphite.

[0051] In another embodiment, when the electrode material type does not match the preset material type, secondary aging can be performed after the rehydration treatment, as detailed in the attached Figure 3 , or perform secondary aging after completing other processes, or do not perform secondary aging, see the attached Figure 4 .

[0052] Furthermore, the first battery cell is subjected to a formation and liquid extraction process to obtain a second battery cell, and then the following steps are further included:

[0053] Obtaining the formation time of the formation liquid extraction process;

[0054] Detecting whether the formation time is less than a preset time;

[0055] When the formation time is less than the preset time, the drawn electrolyte is replenished into the fluid replenishment tank.

[0056] In this embodiment, the formation time is the duration of the formation of the formation and liquid extraction process. The formation time reflects the working time of the first battery cell during the formation operation, which is convenient for detecting the formation and liquid extraction process of the first battery cell. The formation time is less than the preset time, indicating that the formation time of the first battery cell is short, that is, it indicates that the formation stage of the first battery cell is the initial stage. At this time, the degree of formation of the first battery cell is low, and the SEI film has not yet been generated between the electrolyte and the electrode, so that there is no SEI film or other impurities in the extracted gas, so that the electrolyte contained in the extracted gas is pure and does not need to be filtered. It can be directly used as a new electrolyte to replenish the second battery cell, avoiding unnecessary filtering operations, thereby further reducing the production cost of the lithium battery cell. In another embodiment, when the formation time is greater than or equal to the preset time, the extracted electrolyte is filtered and then replenished into the second battery cell.

[0057] Furthermore, the step of performing a liquid replenishing treatment on the second battery cell to obtain a lithium battery cell further includes the following steps:

[0058] Obtaining the electrode surface temperature of the second battery cell;

[0059] Performing surface temperature melting processing on the electrode surface temperature and the preset temperature to obtain an electrode temperature difference component;

[0060] Detecting whether the electrode temperature difference component is greater than 0;

[0061] When the electrode temperature difference component is greater than 0, the extracted and filtered electrolyte is used as a rehydration agent for rehydration treatment.

[0062] In this embodiment, the electrode surface temperature is the surface temperature of the electrode of the second battery cell. The electrode surface temperature is used to reflect the processing steps that the electrode of the second battery cell has undergone. For example, the temperature of the second battery cell after the formation liquid extraction treatment and the secondary aging is different. Specifically, the electrode surface temperature of the second battery cell after the formation liquid extraction treatment is lower, while the electrode surface temperature of the second battery cell after the secondary aging treatment is higher. Performing surface temperature difference processing on the electrode surface temperature and the preset temperature quantifies the degree of difference between the electrode surface temperature of the second battery cell and the standard surface temperature, that is, the electrode temperature difference component, which can effectively reflect whether the second battery cell has undergone a secondary aging operation before rehydration. The electrode temperature difference component is greater than 0, indicating that the electrode surface temperature difference of the second battery cell is large, that is, it indicates that the second battery cell has undergone secondary aging treatment at this time. In this case, the electrode temperature of the second battery cell is high. The electrolyte used for the rehydration treatment of the second battery cell is the electrolyte extracted and filtered during the formation process. At this time, the temperature of the electrolyte used is equal to the electrode surface temperature of the second battery cell, which reduces the temperature difference between the electrolyte and the electrode, avoids the decomposition of the electrolyte after contacting the electrode again, and further effectively improves the capacity retention rate of the lithium battery cell. In another embodiment, when the electrode temperature difference component is less than or equal to 0, the new electrolyte in the rehydration tank is used as a rehydration agent for the rehydration treatment. In this case, the second battery cell does not undergo secondary aging, but is directly rehydrated after the formation liquid extraction treatment. The formation liquid extraction treatment requires the extraction of gas, which reduces the temperature of the second battery cell. Specifically, after the formation liquid extraction treatment, the temperature of the second battery cell is room temperature, and the temperature difference between the new electrolyte used and the electrode of the second battery cell is small, reducing the probability of electrode damage in the second battery cell.

[0063] In one embodiment, the present application also provides a lithium battery cell, which is prepared by the cell forming processing method described in any of the above embodiments. In this embodiment, the cell forming processing method includes performing an aging treatment on the cell to be processed to obtain a first cell; performing a forming and liquid extraction treatment on the first cell to obtain a second cell; and performing a rehydration treatment on the second cell to obtain a lithium battery cell, wherein the electrolyte in the rehydration treatment includes the electrolyte extracted in the forming and liquid extraction treatment. The cell is first aged to obtain an aged first cell, and then the first cell is subjected to forming and liquid extraction operations to facilitate the formation of the first cell, thereby facilitating the extraction of the electrolyte from the gas generated during the formation of the first cell, and finally the extracted electrolyte is added to the second cell as the liquid in the rehydration operation, so that when the electrolyte content in the processed lithium battery cell reaches the specified standard, the waste of the electrolyte extracted during the formation process is avoided, and the production cost of the lithium battery cell is effectively reduced.

[0064] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A battery cell forming method, characterized in that: include: Performing aging treatment on the battery cell to be processed to obtain a first battery cell; Performing a formation and liquid extraction process on the first battery cell to obtain a second battery cell; Performing a rehydration treatment on the second battery cell to obtain a lithium battery cell, wherein the electrolyte in the rehydration treatment includes the electrolyte extracted in the formation and liquid extraction treatment; The step of performing a formation and liquid extraction process on the first battery cell to obtain a second battery cell comprises: Placing the first battery cell in a formation box to perform a formation process and a negative pressure liquid extraction process on the first battery cell to obtain the second battery cell and the extracted electrolytic aerosol to be replenished; filtering the electrolyte aerosol to be replenished to obtain the electrolyte to be replenished for replenishing the second battery cell; Furthermore, the process of performing a liquid replenishing treatment on the second battery cell to obtain a lithium battery cell further includes the following steps: Obtaining the electrode material type of the second battery cell; Detecting whether the electrode material type matches the preset material type; When the electrode material type matches the preset material type, the second battery cell is moved back to the aging box to perform a secondary aging treatment on the second battery cell; The step of performing a liquid replenishing treatment on the second battery cell to obtain a lithium battery cell further includes the following steps: Obtaining the electrode surface temperature of the second battery cell; Performing surface temperature melting processing on the electrode surface temperature and the preset temperature to obtain an electrode temperature difference component; Detecting whether the electrode temperature difference component is greater than 0; When the electrode temperature difference component is greater than 0, the extracted and filtered electrolyte is used as a rehydration agent for rehydration treatment.

2. The battery cell forming method according to claim 1, wherein: The step of performing an aging treatment on the battery cell to be processed to obtain a first battery cell comprises: The battery cell to be processed is placed in an aging box to perform an aging process on the battery cell to be processed to obtain the first battery cell.

3. The battery cell forming method according to claim 1, wherein: The aging treatment includes normal pressure aging.

4. The battery cell forming method according to claim 1, wherein: The aging treatment includes negative pressure aging.

5. The battery cell forming method according to claim 4, characterized in that: The negative pressure of the negative pressure aging is -30Kpa to 100Kpa.

6. The battery cell forming method according to claim 1, characterized in that: The formation temperature of the formation process is 30° C. to 90° C.

7. The battery cell forming method according to claim 1, characterized in that: The negative pressure formed in the negative pressure liquid extraction process is -40Kpa to 100Kpa.

8. A lithium battery cell, characterized in that: The battery is prepared by the battery core forming processing method according to any one of claims 1 to 7.

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