Battery cell formation tooling and formation equipment

Abstract

This utility model discloses a battery cell formation fixture and device for accommodating battery cells during formation. The battery cell formation fixture includes: a housing with an opening on one side; a cover that can close onto the opening side of the housing, and a through hole on the cover; and a connecting terminal that is disposed on the cover and penetrates through the cover. When the cover is closed on the housing, the connecting terminal can communicate with the terminal of the battery cell. Through this technical solution, the battery cell is placed inside the housing, and the cover is closed, making the connecting terminal and the terminal of the battery cell electrically connected. The probe of the formation cabinet is connected to the connecting terminal, and the negative pressure sealing plug of the formation cabinet is sealed to the through hole on the cover. During battery cell formation, the formation cabinet draws negative pressure from the through hole of the cover. This solution can maintain the same internal and external air pressure of the battery cell housing, preventing the battery cell housing from being deformed by pressure.

Description

Technical Field

[0001] This utility model relates to the field of power technology, specifically to a battery cell formation tooling and formation device. Background Technology

[0002] Cell formation is one of the core processes in lithium battery manufacturing. It mainly involves activating the active materials of the electrodes through the first charge and discharge cycle and forming a critical interface layer that affects battery performance. During cell formation, a large amount of gas is generated inside the cell, which needs to be extracted using negative pressure. Current technology directly places the negative pressure module at the electrolyte injection port of the cell. When extracting negative pressure, it usually causes the side of the cell casing to dent, affecting the appearance of the cell and causing adverse effects such as bubbles in the coating. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this utility model provides a battery cell formation tooling and a formation device. The battery cell formation tooling uses a shell to hold the battery cell and a cover to seal the shell. When the cover is closed, the connecting post on the cover and the post of the battery cell are electrically connected. During battery cell formation, negative pressure is drawn from the through hole of the cover. This solution can maintain the same air pressure inside and outside the battery cell shell and avoid deformation of the battery cell shell due to pressure.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a battery cell formation tooling for accommodating battery cells during battery cell formation, comprising: A housing, wherein an opening is provided on one side of the housing; A cover body that can cover the opening side of the housing, and the cover body is provided with a through hole; A connecting terminal is provided on the cover and penetrates through the cover. When the cover is closed on the housing, the connecting terminal can communicate with the terminal of the battery cell.

[0005] The above technical solution involves placing the battery cell into the housing, closing the cover, and ensuring conductive connection between the connecting terminal and the battery cell terminal. The probe of the formation cabinet is connected to the connecting terminal, and the negative pressure sealing plug of the formation cabinet is sealed to the through-hole on the cover. During battery cell formation, the formation cabinet draws negative pressure from the through-hole of the cover. This solution maintains the same internal and external air pressure within the battery cell housing, preventing deformation of the battery cell housing due to pressure.

[0006] Furthermore, an elastic connector is provided on the inward-facing side of the connecting post, and after the battery cell is installed in the housing, the elastic connector can contact the battery cell's post.

[0007] The elastic connector is used to extend the connecting post to ensure that the connecting post can be connected to the post of the battery cell.

[0008] Furthermore, the diameter of the through hole on the cover is the same as the diameter of the liquid injection hole of the battery cell.

[0009] Furthermore, a groove is provided at the bottom of the housing, which is adapted to the shape of the bottom of the battery cell, and the groove can position the battery cell.

[0010] The groove is used to position the battery cell to ensure that the connecting post and the battery cell are in relative positions.

[0011] Furthermore, the distance between the sidewall of the groove and the inner sidewall of the shell adjacent to the sidewall is 8mm to 12mm. If the distance between the sidewall of the groove and the inner sidewall of the shell adjacent to the sidewall is less than 8mm, it will affect the placement of the battery cell, causing the battery cell to be unable to be placed into the shell quickly and effectively. If the distance between the sidewall of the groove and the inner sidewall of the shell adjacent to the sidewall is greater than 10mm, the gap between the sidewall of the shell and the battery cell is too large, and when negative pressure is generated, the time required for negative pressure to extract air is too long.

[0012] Furthermore, the housing is provided with a first connecting part, and the cover is provided with a second connecting part. The second connecting part can be connected and fixed with the first connecting part, so that the cover is closed onto the housing.

[0013] Furthermore, the first connecting portion includes a threaded hole, and the second connecting portion includes a screw.

[0014] Furthermore, a sealing ring is provided on the side of the cover facing the housing. The sealing ring is placed between the cover and the housing to ensure a tight seal and prevent air leakage due to negative pressure.

[0015] Furthermore, the elastic connector includes a spring.

[0016] A cell formation apparatus, comprising: The above-mentioned battery cell formation tooling; The formation cabinet has a probe connected to the connecting pole, and a negative pressure sealing plug connected to the through hole on the cover.

[0017] Based on the above technical solution, the beneficial effects of this utility model are as follows: The battery cell formation tooling disclosed in this application uses a housing to hold the battery cell and a cover to seal the housing. When the cover is closed, the connecting terminal on the cover and the terminal of the battery cell are connected. During battery cell formation, negative pressure is drawn from the through hole of the cover. This solution can keep the internal and external air pressure of the battery cell housing the same and avoid the battery cell housing from being deformed by pressure. Instead of drawing negative pressure directly from the electrolyte injection hole of the battery cell, negative pressure is drawn from the through hole of the cover, thus preventing the electrolyte inside the battery cell from overflowing due to negative pressure.

[0018] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the battery cell formation tooling in an embodiment of this utility model; Figure 2 This is a schematic diagram of the bottom of the shell in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure in which the battery cell is placed inside the housing in an embodiment of this utility model; Figure 4 This is a top view of the battery cell placed inside the housing in an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the cover in an embodiment of this utility model; Figure 6 This is a schematic diagram of the structure of the cover connecting the battery cell in an embodiment of this utility model.

[0021] The reference numerals in the above figures are as follows: 1. Shell; 11. Opening; 12. Groove; 13. Connecting block; 14. Limiting frame; 2. Cover; 21. Connecting pole; 22. Spring; 23. Through hole; 24. Screw; 3. Battery cell; 31. Liquid injection hole; 4. Formation cabinet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] Example: This example discloses a cell formation tooling for accommodating cell 3 during cell formation, such as... Figure 1 The battery cell formation tooling shown includes: A housing 1 is used to house the battery cell 3, and an opening 11 is provided on the upper side of the housing 1. Figure 2 As shown, a groove 12 is provided at the inner bottom of the housing 1, and the groove 12 is adapted to the shape of the bottom of the battery cell 3. The battery cell 3 can be inserted into the housing 1 through the opening 11.

[0025] When installing the battery cell 3, the bottom of the battery cell 3 is inserted into the housing 1 through the opening 11, so that the bottom of the battery cell 3 is placed in the groove 12. The groove 12 positions the battery cell 3 in the length and width directions of the housing. The distance between the side wall of the groove 12 and the inner side wall of the housing 1 adjacent to the side wall can be set to 8mm to 12mm. If the distance between the side wall of the groove 12 and the inner side wall of the housing 1 adjacent to the side wall is less than 8mm, it will affect the placement of the battery cell 3, causing the battery cell 3 to be unable to be placed quickly and effectively into the housing 1. If the distance between the side wall of the groove 12 and the inner side wall of the housing 1 adjacent to the side wall is greater than 12mm, the gap between the side wall of the housing 1 and the battery cell 3 is too large, and when negative pressure is generated, the time required for negative pressure to extract air is too long.

[0026] In some feasible embodiments, the sidewall of the groove 12 and the inner sidewall of the housing 1 adjacent to the sidewall are 10 mm apart.

[0027] In some feasible embodiments, a limiting frame 14 is fixedly connected to the inner bottom of the housing 1, and the bottom of the battery cell 3 can be placed inside the limiting frame 14. The limiting frame 14 can position the battery cell 3 in the length and width directions of the housing.

[0028] like Figure 4 As shown, the housing 1 has a first connecting portion on both sides along its width direction.

[0029] In some feasible embodiments, the first connecting part includes a connecting block 13, which is vertically connected to the side of the housing 1, and the connecting block 13 is provided with a threaded hole.

[0030] The opening 11 of the housing 1 is detachably connected to a cover 2, such as Figure 5 As shown, the cover 2 is provided with a second connecting part that mates with the first connecting part. The first connecting part and the second connecting part can be connected and fixed, thereby fixing the cover 2 to the housing 1.

[0031] In some feasible embodiments, the cross-sectional area of ​​the cover 2 in the horizontal direction is larger than that of the housing 1 in the horizontal direction. The second connecting part includes a screw 24, and the cover 2 is provided with a through hole at a position relative to the threaded hole. By passing the screw 24 through the through hole and the threaded hole, the cover 2 can be fixed to the housing 1.

[0032] In some feasible embodiments, the first connecting part and the second connecting part may also be other connecting mechanisms such as buckles and slots that can seal and fix the cover 2 to the housing 1.

[0033] A connecting post 21 is provided on the cover 2, and the connecting post 21 penetrates the cover 2. An elastic connector is provided on the inward side of the connecting post 21.

[0034] In some feasible embodiments, the cover 2 is provided with two connecting posts 21, which correspond to the positive and negative posts of the battery cell 3, respectively.

[0035] In some feasible embodiments, the resilient connector includes a spring 22. For example... Figure 6 As shown, when the cover 2 is closed on the housing 1, the spring 22 abuts against the terminal of the battery cell 3 to connect the terminal 21 and the terminal of the battery cell 3.

[0036] It should be noted that the battery cell 3 is positioned by the groove 12 at the bottom of the housing 1 to ensure that the terminal of the battery cell 3 and the connecting terminal 21 are in opposite positions, thereby ensuring that the spring 22 can connect the connecting terminal 21 and the terminal of the battery cell 3.

[0037] The cover 2 is also provided with a through hole 23, the diameter of which is the same as the diameter of the liquid injection hole 31 of the battery cell 3.

[0038] A sealing ring is provided on the side of the cover 2 facing the housing 1. The sealing ring can ensure the overall sealing of the tooling and prevent air leakage due to negative pressure.

[0039] Through the above technical solution, the battery cell 3 is placed inside the housing, and the cover is closed, making the connecting terminal and the terminal of the battery cell 3 electrically connected. The probe of the formation cabinet is connected to the connecting terminal, and the negative pressure sealing plug of the formation cabinet is sealed to the through hole on the cover. During the formation of the battery cell 3, the formation cabinet draws negative pressure from the through hole of the cover. This solution can maintain the same air pressure inside and outside the battery cell 3 housing, avoiding deformation of the battery cell 3 housing due to pressure.

[0040] This application also discloses a cell formation apparatus, comprising: The aforementioned cell formation tooling, and the formation cabinet 4 connected to the cell formation tooling, are mainly used for the first charge and discharge activation of the battery (formation process). By precisely controlling the temperature, pressure and electrochemical parameters, the active material is promoted to form a stable passivation film, which directly affects the core performance of the battery, such as capacity and cycle life.

[0041] In some feasible embodiments, the formation cabinet 4 includes a negative pressure formation cabinet, the probe of the formation cabinet 4 is connected to the connecting pole 21, and the negative pressure sealing plug of the formation cabinet 4 is sealed to the through hole 23 on the cover 2.

[0042] The steps for using the above-mentioned cell formation device are as follows: The bottom of the battery cell 3 is inserted into the housing 1 through the opening 11, so that the bottom of the battery cell 3 is placed in the groove 12, and the groove 12 positions the battery cell 3 in the length and width directions of the housing. Cover the opening 11 side of the housing 1 with the cover 2, so that the spring 22 abuts against the terminal of the battery cell, and pass the screw 24 through the threaded hole of the connecting block 13 and tighten it. The probe of the formation cabinet 4 is connected to the connecting pole 21, and the negative pressure sealing plug of the formation cabinet 4 is sealed to the through hole 23 on the cover 2.

[0043] During charging and discharging, spring 22 connects the terminal of the battery cell and the connecting terminal 21, allowing current to flow. When a negative pressure is generated, it is drawn from the through hole 23 on the cover 2. Since the battery cell 3 is entirely contained within the sealed environment of the housing 1, the pressure inside and outside the housing of the battery cell 3 is the same, thus preventing the housing of the battery cell 3 from being squeezed and deformed due to the pressure difference between the inside and outside. Furthermore, in this application, the negative pressure is not drawn directly from the liquid injection hole 31 of the battery cell 3, thus preventing the electrolyte and other substances inside the battery cell 3 from being absorbed.

[0044] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A battery cell formation tooling for accommodating battery cells during battery cell formation, characterized in that, include: A housing, wherein an opening is provided on one side of the housing; A cover body that can cover the opening side of the housing, and the cover body is provided with a through hole; A connecting terminal is provided on the cover and penetrates through the cover. When the cover is closed on the housing, the connecting terminal can communicate with the terminal of the battery cell.

2. The cell formation tooling as described in claim 1, characterized in that, An elastic connector is provided on the inward-facing side of the connecting post. After the battery cell is installed in the housing, the elastic connector can contact the battery cell's post.

3. The cell formation tooling as described in claim 1, characterized in that, The diameter of the through hole on the cover is the same as the diameter of the liquid injection hole of the battery cell.

4. The cell formation tooling as described in claim 2, characterized in that, The bottom of the housing is provided with a groove, which is adapted to the shape of the bottom of the battery cell and can position the battery cell.

5. The cell formation tooling as described in claim 4, characterized in that, The sidewall of the groove and the inner sidewall of the shell adjacent to the sidewall are 8mm to 12mm apart.

6. The cell formation tooling as described in claim 1, characterized in that, The housing is provided with a first connecting part, and the cover is provided with a second connecting part. The second connecting part can be connected and fixed with the first connecting part, so that the cover is closed on the housing.

7. The cell formation tooling as described in claim 6, characterized in that, The first connecting part includes a threaded hole, and the second connecting part includes a screw.

8. The cell formation tooling as described in claim 1, characterized in that, A sealing ring is provided on the side of the cover facing the housing.

9. The cell formation tooling as described in claim 2, characterized in that, The elastic connector includes a spring.

10. A cell formation apparatus, characterized in that, include: The cell formation tooling according to any one of claims 1-9; The formation cabinet has a probe connected to the connecting pole, and a negative pressure sealing plug connected to the through hole on the cover.

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