Side-out tab battery cell assembly

Abstract

The utility model provides a side-out tab battery cell assembly. The side-out tab battery cell assembly comprises a cover plate, the pole groups are arranged on two sides of the inner wall of the cover plate; wherein two sides of the cover plate are provided with connecting pieces which are fixed with the pole group; the cross section of the connecting piece is U-shaped; wherein one sides of the two pole groups are respectively connected with one side of the connecting piece; according to the utility model, the cover plate and the pole group are connected through the U-shaped structure connecting piece, the positive and negative tab structures are folded and pre-welded and then are directly subjected to laser welding with the U-shaped structure connecting piece, the tab structures do not need to be bent, the height of the tab structures and the height of the lower plastic are relatively low, the capacity of the battery cell is improved, and the foil cost is reduced at the same time; the section of the shell is of a U-shaped structure, the shell and the cover plate are welded after the positive and negative tab structures of the pole group are welded with the positive and negative electrode connecting pieces of the cover plate, and the pole group does not need to penetrate through the interior of the shell, so that the assembly difficulty is reduced, the yield is improved, the scratch risk of the pole group is reduced, and the safety of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a side-outlet tab battery cell assembly. Background Art

[0002] At present, power batteries and energy storage batteries are the two major scenarios for the application of battery technology. Energy storage batteries correspond to equipment such as solar and wind power generation, while power batteries correspond to new energy vehicles. A long time ago, the packaging types of power batteries were classified into three major forms: cylindrical, square and soft pack. Intuitively, their differences are only in shape, but they also differ in terms of technical development and application.

[0003] With the continuous improvement of the requirements for battery cell energy density, square batteries have evolved into a double-top cover and side-outlet lug structure. The shell adopts a double-pass structure, and it is also called a "blade battery". This structure can make the shell longer and lower in height, so that the positive and negative electrode covers occupy a smaller proportion of the internal space of the battery cell, greatly improving the battery cell capacity and energy density.

[0004] In some related technologies, the shell of the "blade battery" adopts a double-pass structure, which requires welding the ear and top cover on one side of the positive and negative electrodes first, and then passing the electrode group through the inside of the shell, welding the ear and top cover on the other side. Because the electrode group is long and soft, it is very difficult to assemble when passing through the inside of the shell, and even scratches and short circuits may occur. In addition, whether the positive and negative electrode ears are welded by ultrasonic welding or laser welding, sufficient bending space is required to realize the assembly welding of the top cover and the shell. Therefore, the lower plastic height of the positive and negative electrode top covers and the ear height of the electrode group are both high. While the top cover occupies the internal space of the battery cell, the amount of positive and negative electrode foil is also large, which is not conducive to the improvement of the battery cell energy density and cost control.

[0005] Therefore, how to solve the problem of difficulty in inserting the battery cell electrode assembly into the shell and low yield is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0006] The utility model provides a side-outlet tab battery core assembly to solve the above technical problems.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a side-outlet tab battery cell assembly, comprising a cover plate; and pole groups arranged on both sides of the inner wall of the cover plate; wherein connecting parts fixed to the pole groups are installed on both sides of the cover plate; and the cross-section of the connecting parts is "U-shaped"; wherein one side of the two pole groups is respectively connected to one side of the connecting parts.

[0008] Furthermore, the vertical cross-section of the cover plate is "U-shaped".

[0009] Furthermore, the cover plate is made of aluminum.

[0010] Furthermore, pole structures are provided on both sides of the cover plate corresponding to the connecting pieces.

[0011] Furthermore, lower plastic is provided on both side walls of the cover plate.

[0012] Furthermore, the pole group has pole ear structures fixed on both sides, wherein the pole ear structure and one side wall of the connector are laser welded. Furthermore, the surface of the pole group is coated with an insulating film.

[0013] Furthermore, a hot-melt area is provided on the insulating film; wherein the hot-melt areas correspond to the lower plastic one by one; and the number of the hot-melt areas is not less than four.

[0014] Furthermore, the battery cell assembly also includes a shell; wherein the shell is in a "U" shape opposite to the cover opening; and a sink matching the edge of the shell is provided on the side wall of the cover.

[0015] Furthermore, explosion-proof valve assembly holes are provided at the bottom of the shell and the top of the cover plate.

[0016] Compared with the prior art, the utility model connects the cover plate and the pole group with a U-shaped structural connector, so that the positive and negative pole ear structures are folded and pre-welded and then directly laser welded to the U-shaped connector. The pole ear structure does not need to be bent, and the pole ear structure height and the lower plastic height are both low, which increases the capacity of the battery cell while reducing the foil cost. At the same time, the positive and negative pole column structures are integrated on a single cover plate, and the shell cross-section is a U-shaped structure. After the positive and negative pole ear structures of the pole group are welded to the positive and negative pole connectors of the cover plate, the shell and the cover plate are welded. The pole group does not need to pass through the inside of the shell, which reduces the difficulty of assembly and improves the yield, while reducing the risk of scratches on the pole group and improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is an exploded view of the side-exiting tab battery cell assembly of the utility model;

[0019] Figure 2 A three-dimensional diagram of the optimal embodiment of the cover plate of the utility model;

[0020] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0021] Figure 4 A three-dimensional diagram of the optimal embodiment of the pole group of the utility model;

[0022] Figure 5 It is a stereoscopic diagram of the optimal embodiment of the housing of the utility model.

[0023] Among them, 1. cover plate; 11. pole structure; 12. connector; 13. lower plastic; 14. sink; 2. pole group; 21. pole ear structure; 3. insulating film; 4. shell; 5. explosion-proof valve assembly hole. DETAILED DESCRIPTION

[0024] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0025] See also Figure 1 Combined with Figure 2 , Figure 1 This is an exploded view of the side-outlet tab battery cell assembly of the utility model. Figure 2 This is a three-dimensional diagram of the optimal embodiment of the cover plate of the utility model. Figure 1 to Figure 2 As shown, at least one embodiment provides a side-outlet tab battery cell assembly, a cover plate 1; the vertical section of the cover plate 1 is "U-shaped". The material of the cover plate 1 is aluminum, and the cover plate 1 is an aluminum plate bent into a U shape. The two sides of the cover plate 1 are provided with a pole structure 11 corresponding to the connecting piece 12, and the pole structure 11 includes a positive pole and a negative pole. The two side walls of the cover plate 1 are provided with a lower plastic 13.

[0026] Please continue reading Figure 1 Combined with Figure 4 , Figure 4 3D diagram of the optimal embodiment of the pole group of the utility model. Figure 1 and Figure 4 As shown, the battery cell assembly also includes a pole group 2 arranged on both sides of the inner wall of the cover plate 1; a pole ear structure 21 is fixed on both sides of the pole group 2; the pole ear structure 21 includes a positive pole ear and a negative pole ear, wherein the pole ear structure 21 and one side wall of the connector 12 are laser welded.

[0027] Please continue reading Figure 2 .like Figure 2 As shown, connectors 12 fixed to the pole groups 2 are installed on both sides of the cover plate 1; and the cross-section of the connector 12 is "U-shaped"; the connector 12 includes a positive pole connector and a negative pole connector, wherein one side of the two pole groups 2 is respectively connected to one side of the connector 12, specifically, the pole ear structure 21 on one pole group 2 and one side of the two connectors 12 are fixed by laser welding, and the pole ear structure 21 on the other pole group 2 and the other side of the two connectors 12 are fixed by laser welding.

[0028] Please continue reading Figure 1 .like Figure 1As shown, the surface of the electrode group 2 is covered with an insulating film 3. The insulating film 3 is U-shaped and opposite to the opening of the cover plate 1. A hot-melt area is provided on the insulating film 3; wherein the hot-melt area corresponds to the lower plastic 13 one by one; and the number of the hot-melt areas is not less than four.

[0029] Please continue reading Figure 1 Combined with Figure 3 and Figure 5 , Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle, Figure 5 1 is a stereogram of the best embodiment of the housing of the utility model. Figure 1 , Figure 3 and Figure 5 As shown, the battery cell assembly also includes a shell 4; wherein the shell 4 is a "U" shape opposite to the opening of the cover plate 1; and a sink 14 matching the edge of the shell 4 is provided on the side wall of the cover plate 1. The bottom of the shell 4 and the top of the cover plate 1 are both provided with an explosion-proof valve assembly hole 5; in addition, after the cover plate 1 and the shell 4 are assembled and welded, the connection gap will be further sealed.

[0030] To summarize, the cover plate 1 and the pole group 2 are connected by the U-shaped structural connector 12, and the positive and negative pole ear structures 21 are folded and pre-welded and then directly laser welded to the U-shaped connector 12. The pole ear structure 21 does not need to be bent, and the height of the pole ear structure 21 and the height of the lower plastic 13 are both low, which increases the capacity of the battery cell while reducing the foil cost. At the same time, the positive and negative pole column structures 11 are integrated on a single cover plate 1, and the cross-section of the shell 4 is a U-shaped structure. After the positive and negative pole ear structures 21 of the pole group 2 are welded to the positive and negative pole connectors 12 of the cover plate 1, the shell 4 is welded to the cover plate 1. The pole group 2 does not need to pass through the inside of the shell 4, which reduces the difficulty of assembly and improves the yield, while reducing the risk of scratching the pole group 2 and improving the safety of the battery cell.

[0031] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A side-outlet tab battery cell assembly, characterized in that: include: a cover plate (1); and The pole groups (2) are arranged on both sides of the inner wall of the cover plate (1); wherein Connectors (12) fixed to the electrode groups (2) are installed on both sides of the cover plate (1); and The cross section of the connecting member (12) is "U-shaped"; wherein One side of each of the two pole groups (2) is connected to one side of the connecting member (12) respectively.

2. The battery cell assembly according to claim 1, characterized in that: The vertical cross section of the cover plate (1) is "U-shaped".

3. The battery cell assembly according to claim 2, characterized in that: The cover plate (1) is made of aluminum.

4. The battery cell assembly according to claim 3, characterized in that: Polar column structures (11) are provided on both sides of the cover plate (1) corresponding to the connecting pieces (12).

5. The battery cell assembly according to claim 4, characterized in that: Lower plastic (13) is provided on both side walls of the cover plate (1).

6. The battery cell assembly according to claim 5, characterized in that: The pole lug structures (21) are fixed on both sides of the pole group (2); wherein The pole ear structure (21) and one side wall of the connecting piece (12) are welded by laser.

7. The battery cell assembly according to claim 6, characterized in that: The surface of the electrode group (2) is covered with an insulating film (3).

8. The battery cell assembly according to claim 7, characterized in that: The insulating film (3) is provided with a hot-melt area; wherein The hot-melt area corresponds to the lower plastic (13) one by one; and The number of the hot-melt areas is not less than four.

9. The battery cell assembly according to any one of claims 1 to 8, characterized in that: The battery core assembly also includes a shell (4); wherein The housing (4) is in a "U" shape opposite to the opening of the cover plate (1); and A sink (14) matching the edge of the shell (4) is provided on the side wall of the cover plate (1).

10. The battery cell assembly according to claim 9, characterized in that: The bottom of the housing (4) and the top of the cover plate (1) are both provided with explosion-proof valve assembly holes (5).

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