Battery cell and battery cell group
By setting an insulating film on the outer periphery of the square battery cell casing and connecting an extension at the end, the problems of cumbersome and costly coating process are solved, achieving the effect of simplifying the process and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-03-17
AI Technical Summary
In the existing technology, the coating process of square battery cells is complicated and costly, requiring the wrapping of an insulating film on the outer periphery of the casing and the attachment of insulating patches at the ends.
An insulating film is used to surround the outer periphery of the shell, and an extension is connected to the end of the shell. The extension is folded to cover the cover plate, avoiding the battery cell terminals and pressure relief structure, reducing the film wrapping process and the need to attach insulating patches to the shell.
The coating process has been simplified, costs have been reduced, and insulation and sealing performance have been improved.
Smart Images
Figure CN224006108U_ABST
Abstract
Description
Technical Field
[0001] This specification relates to the field of battery cell assembly technology, and more particularly to a battery cell and a battery cell assembly. Background Technology
[0002] Currently, square battery cells require an aluminum casing for protection, thus necessitating insulation of their outer surface. In related technologies, an insulating film is typically wrapped around the outer periphery of the square battery cell, and then insulating patches are attached to its ends to meet the insulation requirements. However, this method of wrapping square battery cells not only makes the process cumbersome but also increases the cost.
[0003] Therefore, there is an urgent need for a battery cell and battery cell assembly to solve the above problems. Utility Model Content
[0004] The purpose of the embodiments in this specification is to provide a battery cell and a battery cell assembly that reduces the process of coating the casing and lowers the coating cost.
[0005] To achieve this objective, the embodiments in this specification adopt the following technical solutions:
[0006] A battery cell, comprising:
[0007] A housing, wherein a first cover plate is provided at one end of the housing, and a cell terminal is provided on the first cover plate; and a second cover plate is provided at the other end of the housing, and a pressure relief structure is provided on the second cover plate; and
[0008] An insulating film, comprising an insulating film body and a first extension connected to the insulating film body, the insulating film body being annularly arranged around the outer periphery of the housing, the first extension extending outward from the end of the housing, and the first extension being folded to cover one of the first cover plate and the second cover plate.
[0009] As an optional solution, the first extension is provided with a first clearance hole. When the first extension is folded to cover the first cover plate, the first clearance hole is used to avoid the battery cell terminal. When the first extension is folded to cover the second cover plate, the first clearance hole is used to avoid the pressure relief structure.
[0010] As an optional feature, the battery cell also includes:
[0011] An insulating sheet is provided, which covers the first cover plate. A second clearance hole is provided on the insulating sheet, which is used to avoid the battery cell terminal.
[0012] As an optional feature, the battery cell also includes:
[0013] An insulating sheet is provided, which covers the second cover plate. The insulating sheet has a second clearance hole, which is used to avoid the pressure relief structure.
[0014] As an option, the insulating film further includes a second extension connected to the insulating film body, the second extension being arranged at a distance from the first extension, the second extension extending outward from the end of the housing, and the second extension folding over and covering the other of the first cover plate and the second cover plate.
[0015] As an optional solution, a third clearance hole is provided on the second extension. When the second extension is folded to cover the first cover plate, the third clearance hole is used to avoid the battery cell terminal. When the second extension is folded to cover the second cover plate, the third clearance hole is used to avoid the pressure relief structure.
[0016] As an optional solution, the second extension includes a first connecting piece, a second connecting piece, a third connecting piece, and a fourth connecting piece connected in sequence, wherein the first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are all connected to the insulating film body;
[0017] When the insulating film body is arranged in a ring around the outer periphery of the housing, the first connecting piece and the third connecting piece are arranged at intervals relative to each other, and the second connecting piece and the fourth connecting piece are arranged at intervals relative to each other. The first connecting piece, the second connecting piece, the third connecting piece and the fourth connecting piece are all folded over relative to the insulating film body and placed on the other of the first cover plate and the second cover plate.
[0018] As an alternative, the first and last regions of the insulating film body are stacked and fixed to form an overlapping region, and the overlapping region is located on the outer periphery of the shell.
[0019] As an optional solution, the first extension includes a first fold, a second fold, a third fold, and a fourth fold connected in sequence, wherein the first fold, the second fold, the third fold, and the fourth fold are all connected to the insulating film body;
[0020] When the insulating film body is arranged in a ring around the outer periphery of the housing, the first fold and the third fold are arranged at intervals relative to each other, and the second fold and the fourth fold are arranged at intervals relative to each other. The first fold, the second fold, the third fold and the fourth fold are all folded relative to the insulating film body and placed on one of the first cover plate and the second cover plate.
[0021] A battery cell assembly includes at least two battery cells as described above, wherein the at least two battery cells are arranged sequentially and electrically connected.
[0022] This specification provides a battery cell comprising a housing and an insulating film. One end of the housing has a first cover plate with a battery cell terminal on it, and the other end has a second cover plate with a pressure relief structure. The insulating film includes an insulating film body and a first extension connected to the insulating film body. The insulating film body is annularly arranged around the outer periphery of the housing. The first extension extends beyond the end of the housing and is folded to cover one of the first and second cover plates. The battery cell provided in this specification, by connecting the first extension to the insulating film body, allows the first extension extending beyond the housing to fold to cover one of the first and second cover plates when the insulating film body is annularly arranged around the outer periphery of the housing. This eliminates the need for additional insulating patches on both the first and second cover plates, reducing the number of steps required for the housing coating process and lowering the coating cost.
[0023] This specification also provides a battery cell assembly that reduces the process of coating the casing and lowers the cost of coating by using the aforementioned battery cells. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the first partial structure of the shell provided in Embodiment 1 of this utility model;
[0025] Figure 2 This is a schematic diagram of the second partial structure of the shell provided in Embodiment 1 of this utility model;
[0026] Figure 3 This is a planar unfolded schematic diagram of the insulating film provided in Embodiment 1 of this utility model;
[0027] Figure 4 This is a schematic diagram of the first partial structure of the battery cell provided in Embodiment 1 of this utility model;
[0028] Figure 5 This is a schematic diagram of the second partial structure of the battery cell provided in Embodiment 1 of this utility model;
[0029] Figure 6 This is a planar unfolded schematic diagram of the insulating film provided in Embodiment 2 of this utility model;
[0030] Figure 7 This is a partial structural schematic diagram of the battery cell provided in Embodiment 2 of this utility model.
[0031] In the picture:
[0032] 1. Housing; 11. Second cover plate; 12. First cover plate; 13. Pressure relief structure; 14. Cell terminal;
[0033] 2. Insulating film; 21. Insulating film body; 22. First extension; 221. First fold; 222. Second fold; 223. Third fold; 224. Fourth fold; 225. First clearance hole; 23. Second extension; 231. First connecting piece; 232. Second connecting piece; 233. Third connecting piece; 234. Fourth connecting piece; 235. Third clearance hole;
[0034] 3. Insulating sheet; 31. Second clearance hole. Detailed Implementation
[0035] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the embodiments of this specification clearer, the technical solutions of the embodiments of this specification will be further described below in conjunction with the accompanying drawings and specific implementation methods.
[0036] In the description of the embodiments in this specification, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this specification based on the specific circumstances.
[0037] In the embodiments of this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0038] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this specification. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0039] Example 1
[0040] like Figure 1 and Figure 2 As shown, this embodiment provides a battery cell, which includes a housing 1. The housing 1 is square, and a first cover plate 12 is provided at one end of the housing 1. A battery cell terminal 14 is provided on the first cover plate 12, and a second cover plate 11 is provided at the other end of the housing 1. A pressure relief structure 13 is provided on the second cover plate 11. Optionally, in this embodiment, two battery cell terminals 14 are arranged at intervals on the first cover plate 12, and the two battery cell terminals 14 are a positive terminal and a negative terminal, respectively. Optionally, in this embodiment, the second cover plate 11 is the bottom end of the housing 1, and the first cover plate 12 is the top end of the housing 1.
[0041] In related technologies, to ensure that the outer surface of the battery cell has a certain insulation performance, an insulating film is usually wrapped around the outer periphery of the casing 1, and then insulating patches are attached to both ends of the casing 1 to meet the insulation requirements of the outer surface of the battery cell. However, the above-mentioned method of wrapping the battery cell not only requires wrapping with an insulating film, but also requires attaching insulating patches to both ends of the casing 1, which not only makes the wrapping process cumbersome, but also increases the cost of wrapping.
[0042] To solve the above problems, such as Figures 1-4 As shown, the battery cell provided in this embodiment also includes an insulating film 2. The insulating film 2 includes an insulating film body 21 and a first extension 22 connected to the insulating film body 21. The insulating film body 21 is annularly arranged around the outer periphery of the housing 1. The first extension 22 extends outward from the end of the housing 1 and is folded to cover one of the first cover plate 12 and the second cover plate 11. The battery cell provided in this embodiment, by connecting the first extension 22 to the insulating film body 21, allows the first extension 22 extending outward from the end of the housing 1 to fold to cover one of the first cover plate 12 and the second cover plate 11 when the insulating film body 21 is annularly arranged around the outer periphery of the housing 1. This eliminates the need to additionally attach insulating patches to both the first cover plate 12 and the second cover plate 11 for insulation, reducing the number of steps required to coat the housing 1 and lowering the cost of coating. Optionally, in this embodiment, the first extension 22 is folded to cover the second cover plate 11. In other embodiments, the first extension 22 is folded to cover the first cover plate 12.
[0043] Optionally, in this embodiment, the insulating film 2 is an insulating blue film. The insulating blue film has inherent adhesiveness, which facilitates wrapping and fixing the shell 1, and the insulating blue film has the advantages of good thermal stability and good electrical insulation performance.
[0044] In this embodiment, as Figure 4As shown, the first extension 22 has a first clearance hole 225, which is used to avoid the pressure relief structure 13 at the second cover plate 11. Optionally, the shape of the first clearance hole 225 is adapted to the shape of the pressure relief structure 13. In other embodiments, when the first extension 22 is folded to cover the first cover plate 12, the first extension 22 has two first clearance holes 225, which are used to avoid the corresponding battery cell terminals 14, and the shape of the first clearance hole 225 is adapted to the shape of the battery cell terminals 14.
[0045] Optionally, in this embodiment, after the first extension 22 is folded at the second cover plate 11, the first clearance hole 225 can be laser-cut out. In other embodiments, the first clearance hole 225 can also be laser-cut out at the corresponding position of the first extension 22 before the insulating film 2 is folded out.
[0046] In this embodiment, the first and last regions of the insulating film body 21 are stacked and fixed to form an overlapping region, and the overlapping region is located on the outer periphery of the shell 1. By stacking and fixing the first and last regions of the insulating film body 21 to form an overlapping region, not only is the stability of the insulating film body 21 wrapped and fixed on the outer periphery of the shell 1 guaranteed, but the sealing effect of wrapping the outer periphery of the shell 1 is also improved.
[0047] In this embodiment, as Figure 3 and Figure 4As shown, the first extension 22 includes a first fold 221, a second fold 222, a third fold 223, and a fourth fold 224 connected in sequence. The first fold 221, the second fold 222, the third fold 223, and the fourth fold 224 are all connected to the insulating film body 21. When the insulating film body 21 is arranged in a ring around the outer periphery of the housing 1, the first fold 221 and the third fold 223 are arranged at intervals relative to each other, and the second fold 222 and the fourth fold 224 are arranged at intervals relative to each other. The first fold 221, the second fold 222, the third fold 223, and the fourth fold 224 are all folded relative to the insulating film body 21 and placed on the second cover plate 11. Optionally, in this embodiment, when folding the first extension 22, the first fold 221 and the third fold 223 are first folded over and placed on the second cover plate 11. Then, the second fold 222 is folded over and placed on the second cover plate 11, with the second fold 222 overlapping the first fold 221 and the third fold 223. Finally, the fourth fold 224 is folded over and placed on the second cover plate 11, with the fourth fold 224 overlapping the first fold 221, the third fold 223, and the second fold 222. In other embodiments, the specific stacking order of the first fold 221, the second fold 222, the third fold 223, and the fourth fold 224 can be set according to requirements, as long as the first fold 221, the second fold 222, the third fold 223, and the fourth fold 224 can collectively cover the second cover plate 11.
[0048] In this embodiment, Figure 1 and Figure 5 As shown, the battery cell also includes an insulating sheet 3, which covers the first cover plate 12 of the housing 1. The insulating sheet 3 has a second clearance hole 31, which is used to avoid the battery cell terminal 14 at the first cover plate 12. Optionally, in this embodiment, the insulating sheet 3 has two spaced-apart second clearance holes 31, which are used to avoid the battery cell terminal 14 at corresponding positions. Optionally, in this embodiment, the shape of the second clearance hole 31 is adapted to the shape of the battery cell terminal 14. In other embodiments, when the insulating sheet 3 covers the second cover plate 11, the second clearance hole 31 is used to avoid the pressure relief structure 13, and the shape of the second clearance hole 31 is adapted to the shape of the pressure relief structure 13.
[0049] This embodiment also provides a battery cell assembly, which includes at least two of the aforementioned battery cells, arranged sequentially and electrically connected. By using the aforementioned battery cells, the battery cell assembly provided in this embodiment reduces the process of coating the housing 1 and lowers the cost of coating. Optionally, in this embodiment, the battery cell assembly can be a blade battery cell assembly.
[0050] Example 2
[0051] The battery cell provided in this embodiment is basically the same as that in Embodiment 1. The difference between the battery cell provided in this embodiment and that in Embodiment 1 is as follows:
[0052] In this embodiment, as Figure 6 and Figure 7 As shown, the insulating film 2 also includes a second extension 23 connected to the insulating film body 21. The second extension 23 is arranged at intervals relative to the first extension 22. The second extension 23 extends outward from the end of the housing 1 and is folded to cover the first cover plate 12. By connecting the second extension 23 to the insulating film body 21, when the insulating film body 21 is arranged in a ring around the outer periphery of the housing 1, the first extension 22 extending outward from the end of the housing 1 can be folded to cover the second cover plate 11 of the housing 1, and the second extension 23 extending outward from the end of the housing 1 can be folded to cover the first cover plate 12 of the housing 1. This eliminates the need for additional insulating patches to be pasted on the second cover plate 11 and the first cover plate 12 of the housing 1, further reducing the process of wrapping the housing 1 and further reducing the cost of wrapping.
[0053] In this embodiment, as Figure 7 As shown, a third clearance hole 235 is provided on the second extension 23, which is used to avoid the cell electrode post 14 at the first cover plate 12. Optionally, in this embodiment, the second extension 23 has two spaced-apart third clearance holes 235, which are used to avoid the cell electrode post 14 at corresponding positions. Optionally, in this embodiment, the shape of the third clearance hole 235 is adapted to the shape of the cell electrode post 14.
[0054] In this embodiment, as Figure 6 and Figure 7As shown, the second extension 23 includes a first connecting piece 231, a second connecting piece 232, a third connecting piece 233, and a fourth connecting piece 234 connected in sequence. The first connecting piece 231, the second connecting piece 232, the third connecting piece 233, and the fourth connecting piece 234 are all connected to the insulating film body 21. When the insulating film body 21 is arranged in a ring around the outer periphery of the housing 1, the first connecting piece 231 and the third connecting piece 233 are arranged at intervals relative to each other, and the second connecting piece 232 and the fourth connecting piece 234 are arranged at intervals relative to each other. The first connecting piece 231, the second connecting piece 232, the third connecting piece 233, and the fourth connecting piece 234 are all folded relative to the insulating film body 21 and placed on the first cover plate 12. Optionally, in this embodiment, when folding the second extension 23, the first connecting piece 231 and the third connecting piece 233 are first folded and placed on the first cover plate 12, then the second connecting piece 232 is folded and placed on the first cover plate 12, with the second connecting piece 232 overlapping the first connecting piece 231 and the third connecting piece 233. Finally, the fourth connecting piece 234 is folded and placed on the first cover plate 12, with the fourth connecting piece 234 overlapping the first connecting piece 231, the third connecting piece 233, and the second connecting piece 232. In other embodiments, the specific stacking order of the first connecting piece 231, the second connecting piece 232, the third connecting piece 233, and the fourth connecting piece 234 can be set according to requirements, as long as the first connecting piece 231, the second connecting piece 232, the third connecting piece 233, and the fourth connecting piece 234 can together cover the first cover plate 12.
[0055] This embodiment also provides a battery cell assembly, which includes at least two of the aforementioned battery cells, arranged sequentially and electrically connected. By using the aforementioned battery cells, the battery cell assembly provided in this embodiment reduces the process of coating the housing 1 and lowers the cost of coating. Optionally, in this embodiment, the battery cell assembly can be a blade battery cell assembly.
[0056] Obviously, the above embodiments of this specification are merely examples for clearly illustrating the embodiments of this specification, and are not intended to limit the implementation of the embodiments of this specification. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the embodiments of this specification should be included within the protection scope of the claims of the embodiments of this specification.
Claims
1. An electric cell, characterized by, The application relates to a battery cell, which comprises: a shell (1), one end of the shell (1) being provided with a first cover plate (12) provided with an electrode post (14) of an electric core, the other end of the shell (1) being provided with a second cover plate (11) provided with a pressure relief structure (13); and an insulating film (2) comprising an insulating film body (21) and a first extension (22) connected with the insulating film body (21), the insulating film body (21) being annular and arranged around the outer circumferential side of the shell (1), the first extension (22) extending out of the end of the shell (1), and the first extension (22) being folded and covered on one of the first cover plate (12) and the second cover plate (11).
2. The electric cell of claim 1, wherein, The first extension (22) is provided with a first avoiding hole (225), the first avoiding hole (225) being used for avoiding the electrode post (14) when the first extension (22) is folded and covered on the first cover plate (12), and the first avoiding hole (225) being used for avoiding the pressure relief structure (13) when the first extension (22) is folded and covered on the second cover plate (11).
3. The electric cell of claim 1, wherein, The battery cell further comprises: an insulating sheet (3) covered on the first cover plate (12), the insulating sheet (3) being provided with a second avoiding hole (31) used for avoiding the electrode post (14).
4. The electric cell of claim 1, wherein, The battery cell further comprises: an insulating sheet (3) covered on the second cover plate (11), the insulating sheet (3) being provided with a second avoiding hole (31) used for avoiding the pressure relief structure (13).
5. The electric cell of claim 1, wherein, The insulating film (2) further comprises a second extension (23) connected with the insulating film body (21), the second extension (23) being arranged in opposite intervals with the first extension (22), the second extension (23) extending out of the end of the shell (1), and the second extension (23) being folded and covered on the other one of the first cover plate (12) and the second cover plate (11).
6. The electric cell of claim 5, wherein, The second extension (23) is provided with a third avoiding hole (235), the third avoiding hole (235) being used for avoiding the electrode post (14) when the second extension (23) is folded and covered on the first cover plate (12), and the third avoiding hole (235) being used for avoiding the pressure relief structure (13) when the second extension (23) is folded and covered on the second cover plate (11).
7. The electric cell of claim 5, wherein, The second extension (23) comprises a first connecting sheet (231), a second connecting sheet (232), a third connecting sheet (233) and a fourth connecting sheet (234) connected in sequence, and the first connecting sheet (231), the second connecting sheet (232), the third connecting sheet (233) and the fourth connecting sheet (234) are all connected with the insulating film body (21). When the insulating film body (21) is annularly arranged around the outer periphery of the case (1), the first connecting piece (231) and the third connecting piece (233) are arranged in opposite directions, the second connecting piece (232) and the fourth connecting piece (234) are arranged in opposite directions, and the first connecting piece (231), the second connecting piece (232), the third connecting piece (233), and the fourth connecting piece (234) are folded and arranged on the other one of the first cover plate (12) and the second cover plate (11) relative to the insulating film body (21).
8. The battery cell of any one of claims 1 to 7, wherein, The first and second end regions of the insulating film body (21) are arranged in opposite directions to form an overlapping region, and the overlapping region is arranged on the outer periphery of the case (1).
9. The battery cell of any one of claims 1 to 7, wherein, The first extending portion (22) comprises a first fold (221), a second fold (222), a third fold (223), and a fourth fold (224) connected in sequence, and the first fold (221), the second fold (222), the third fold (223), and the fourth fold (224) are connected to the insulating film body (21). When the insulating film body (21) is annularly arranged around the outer periphery of the case (1), the first fold (221) and the third fold (223) are arranged in opposite directions, the second fold (222) and the fourth fold (224) are arranged in opposite directions, and the first fold (221), the second fold (222), the third fold (223), and the fourth fold (224) are folded and arranged on one of the first cover plate (12) and the second cover plate (11) relative to the insulating film body (21).
10. An electric cell pack, characterized by, The battery comprises at least two battery cells as claimed in any one of claims 1 to 9, and the at least two battery cells are arranged in sequence and electrically connected.