Battery cell and battery cell group
By designing an overlapping area of annular insulating film on the outer periphery of the square shell and using the extrusion and fixing of the battery cell, the problem of insulating film separation failure is solved, thereby improving insulation performance and coating efficiency.
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
The insulating film on the outer surface of the existing square shell is prone to separation and failure, resulting in a decrease in insulation performance.
The insulating film is designed to be annularly enclosed on the outer periphery of the shell, with overlapping areas at the beginning and end. It is fixed by the compression of adjacent cells, which avoids deformation, bulging and separation failure of the overlapping area, thus improving the coating efficiency.
It improves the insulation performance and coating efficiency of the outer periphery of the shell, ensuring the reliability and stability of the overlapping area.
Smart Images
Figure CN224006107U_ABST
Abstract
Description
Technical Field
[0001] The embodiments in this specification relate to the field of battery technology, and in particular to a battery cell and a battery cell assembly. Background Technology
[0002] Currently, the outer surface of a square shell has certain insulation requirements. In related technologies, an insulating film is typically wrapped around the outer surface of the square shell. However, existing wrapping methods are ineffective, and the insulating film is prone to separation and failure, reducing the insulation performance of the outer periphery of the square shell.
[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 to ensure the reliability of the overlapping area, improve the insulation performance of the outer periphery of the casing, and improve the coating efficiency.
[0005] To achieve this objective, the embodiments in this specification adopt the following technical solutions:
[0006] A battery cell, comprising:
[0007] A housing, the outer periphery of which includes two first walls and two second walls, the two first walls being arranged with a gap between them, the two second walls being arranged with a gap between them, each first wall being connected between the two second walls, and the area of the first wall being larger than the area of the second wall; and
[0008] An insulating film is provided, which is arranged in a ring around the outer periphery of the shell. The beginning and end regions of the insulating film are stacked and fixed to form an overlapping region, and the overlapping region is located on the first wall surface.
[0009] As an optional solution, the first and last regions of the insulating film are connected and stacked to form the overlapping region.
[0010] Alternatively, the two ends of the overlapping region may extend to the two ends of the housing, respectively.
[0011] As an alternative, the first wall is divided into a first half-region and a second half-region along the direction in which the two second walls are arranged at relative intervals, and the overlapping region is located at the first half-region or the second half-region.
[0012] As an optional feature, the length of the housing is 400mm to 1200mm; the width of the housing is 50mm to 120mm; and the height of the housing is 80mm to 250mm.
[0013] As an alternative, the insulating film includes a first folded portion that extends outward from the end of the housing and is folded over to the first end of the housing.
[0014] As an optional feature, the battery cell also includes:
[0015] A first insulating sheet is stacked on the first folded portion and covers the first end.
[0016] As an optional solution, the first insulating sheet is provided with a first clearance hole, which is used to avoid the explosion-proof valve or cell terminal at the first end.
[0017] As an optional feature, the insulating film further includes:
[0018] The second folding portion is arranged at a distance from the first folding portion, the second folding portion extends outward from the end of the housing, and the second folding portion is folded to the second end of the housing.
[0019] As an optional feature, the battery cell also includes:
[0020] The second insulating sheet is stacked on the second folded portion and covers the second end. The second insulating sheet has a second clearance hole, which is used to avoid the explosion-proof valve or cell terminal at the second end.
[0021] A battery cell assembly includes at least one pair of cells, each pair comprising two cells as described above, wherein the two cells of the pair are stacked sequentially and the first wall surfaces of the two cells face each other.
[0022] As an alternative, the overlapping regions of the two cells in the cell pair are arranged opposite each other, and the two overlapping regions are staggered.
[0023] This specification provides a battery cell comprising a housing and an insulating film. The outer periphery of the housing includes two first walls and two second walls. The two first walls are arranged with a gap between them, and the two second walls are also arranged with a gap between them. Each first wall is connected between two second walls, and the area of the first wall is larger than the area of the second wall. The insulating film is annularly arranged around the outer periphery of the housing, with the beginning and end regions of the insulating film overlapping and fixed to form an overlapping area located on the first wall. The battery cell provided in this specification, by designing the overlapping area on the first wall of the outer periphery of the housing, ensures that the overlapping area is located on the larger surface of the housing. When multiple battery cells are stacked sequentially, as long as the first walls of adjacent battery cells are opposite each other, the overlapping area can be pressed and fixed by the larger surfaces of the adjacent battery cells. This avoids the problem of deformation and bulging of the overlapping area, avoids the risk of separation and failure of the overlapping area, ensures the reliability of the overlapping area, and improves the insulation performance of the outer periphery of the housing. Furthermore, since the insulating film is arranged in a ring around the outer periphery of the shell, and the beginning and end areas of the insulating film are overlapped and fixed to form an overlapping area, it is convenient to carry out the coating operation on the outer periphery of the shell, thus improving the coating efficiency.
[0024] This specification also provides a battery cell assembly, which includes at least one pair of cells, each pair comprising two cells as described above. The two cells of the cell pair are stacked sequentially, with their first walls facing each other. The battery cell assembly provided in this specification, by having the first walls of the two cells of the cell pair facing each other, ensures that the overlapping area is compressed and fixed by the large surfaces of the two cells, thereby avoiding deformation and bulging in the overlapping area, preventing the risk of separation and failure in the overlapping area, ensuring the reliability of the overlapping area, and improving the insulation performance of the outer periphery of the casing. Furthermore, since the insulating film is annularly arranged around the outer periphery of the casing, and the beginning and end regions of the insulating film are stacked and fixed to form an overlapping area, the coating operation on the outer periphery of the casing is facilitated, improving the coating efficiency. Attached Figure Description
[0025] Figure 1 This is an exploded view of the battery cell structure provided in this embodiment of the utility model;
[0026] Figure 2 This is a schematic diagram of the battery cell structure provided in an embodiment of the present invention;
[0027] Figure 3 This is an exploded view of the battery cell assembly provided in an embodiment of this utility model.
[0028] In the picture:
[0029] 10. Battery cells;
[0030] 1. Housing; 11. First wall surface; 111. First half-region; 112. Second half-region; 12. Second wall surface; 13. First end; 14. Cell terminal;
[0031] 2. Insulating film; 21. Insulating film body; 211. Overlapping area; 22. First fold;
[0032] 3. First insulating sheet; 31. First clearance hole;
[0033] 4. Second insulating sheet; 41. Second clearance hole. Detailed Implementation
[0034] 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.
[0035] 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.
[0036] 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.
[0037] 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.
[0038] like Figure 1As shown, this embodiment provides a battery cell 10, which includes a housing 1. The housing 1 is square, and its outer periphery includes two first walls 11 and two second walls 12. The two first walls 11 are arranged at intervals relative to each other, and the two second walls 12 are arranged at intervals relative to each other. Each first wall 11 is connected between two second walls 12, and the area of the first wall 11 is larger than the area of the second wall 12. Optionally, in this embodiment, the two ends of the housing 1 are a first end 13 and a second end (not shown in the figure). Optionally, in this embodiment, two battery cell terminals 14 are arranged at intervals on the first end 13, which are a positive terminal and a negative terminal, respectively. An explosion-proof valve is provided on the second end. Optionally, in this embodiment, the first end 13 is the top end of the housing 1, and the second end is the bottom end of the housing 1. In other embodiments, two spaced-apart battery terminals 14 may be provided at the second end, and an explosion-proof valve may be provided at the first end 13, or an explosion-proof valve and two battery terminals 14 may be provided at the first end 13, or an explosion-proof valve and two battery terminals 14 may be provided at the second end.
[0039] Optionally, in this embodiment, the length of the housing 1 is 400mm to 1200mm; the width of the housing 1 is 50mm to 120mm; and the height of the housing 1 is 80mm to 250mm. These settings make the battery cell 10 similar to a blade battery cell, and the battery cell 10 is shorter than the length of existing blade batteries.
[0040] In related technologies, when a square housing 1 is coated, the insulating films are typically stacked to form overlapping areas, thereby ensuring a tight wrapping of the housing 1. After the housing 1 has been used for a period of time, the increased air pressure inside the housing 1 can cause deformation at the overlapping areas. When the overlapping areas are subjected to long-term stress, there is a risk of separation failure in the overlapping areas. Furthermore, as the thickness of the housing 1 increases, the risk of separation failure in the overlapping areas is further aggravated, reducing the insulation performance of the outer periphery of the housing 1.
[0041] To solve the above problems, such as Figure 1 and Figure 2As shown, the battery cell 10 provided in this embodiment also includes an insulating film 2. The insulating film 2 is annularly arranged and wraps around the outer periphery of the housing 1. The first and last regions of the insulating film 2 are stacked and fixed to each other to form an overlapping region 211, and the overlapping region 211 is located on the first wall surface 11. The battery cell 10 provided in this embodiment, by designing the overlapping region 211 at the first wall surface 11 on the outer periphery of the housing 1, makes the overlapping region 211 located on the large surface of the housing 1. When multiple battery cells 10 are stacked and arranged in sequence, as long as the first wall surfaces 11 of two adjacent battery cells 10 are opposite each other, it can be ensured that the overlapping region 211 is squeezed and fixed by the large surfaces of the two adjacent battery cells 10, thereby avoiding the problem of deformation and bulging of the overlapping region 211, avoiding the risk of separation and failure of the overlapping region 211, ensuring the reliability of the overlapping region 211, and improving the insulation performance of the outer periphery of the housing 1. Furthermore, since the insulating film 2 is arranged in a ring around the outer periphery of the shell 1, and the beginning and end regions of the insulating film 2 are stacked and fixed to form an overlapping region 211, it is convenient to realize the coating operation on the outer periphery of the shell 1 and improve the coating efficiency.
[0042] Optionally, in this embodiment, the first and last regions of the insulating film 2 are connected and stacked to form an overlapping region 211, further ensuring the stability of the overlapping region 211. Optionally, when the first and last regions of the insulating film 2 are connected and stacked, the first and last regions of the insulating film 2 are only stacked one layer on top of each other, thereby reducing costs and improving the coating effect. Optionally, in this embodiment, the first and last regions of the insulating film 2 are glued and stacked to form the overlapping region 211. The above settings facilitate the stacking and fixing of the first and last regions of the insulating film 2, making the operation convenient and the structure simple, and also ensuring the stability and reliability of the stacking and fixing of the first and last regions of the insulating film 2. Optionally, in this embodiment, the insulating film 2 can be an insulating blue film, which has the advantages of good adhesion and good electrical insulation performance. In other embodiments, the first and last regions of the insulating film 2 can also be stacked and fixed to form the overlapping region 211 by snap-fit or plug-in fixing.
[0043] It should be noted that, in this embodiment, the two ends of the overlapping region 211 extend to the two ends of the housing 1 respectively, and the overlapping region 211 extends along the length direction of the first wall surface 11.
[0044] Optionally, in this embodiment, as Figure 1As shown, the first wall 11 is divided into a first half-region 111 and a second half-region 112 along the direction in which the two second walls 12 are arranged at relative intervals. The overlapping region 211 is located at either the first half-region 111 or the second half-region 112. By placing the overlapping region 211 at either the first half-region 111 or the second half-region 112, the overlapping region 211 is prevented from being located at the connection between the first half-region 111 and the second half-region 112 simultaneously. When the first walls 11 of two adjacent cells 10 are opposite each other, the overlapping region 211 in the two adjacent cells 10 can be effectively prevented from overlapping due to relative arrangement. This avoids adding an extra thickness of the overlapping region 211 to the cell group and also makes the force between each cell 10 more balanced.
[0045] Optionally, in this embodiment, the positive and negative terminals are spaced apart at the first end 13 along the direction in which the two second walls 12 are arranged relatively apart. Optionally, in this embodiment, the overlapping region 211 is located at the first half-region 111. Optionally, in this embodiment, the overlapping region 211 is located on one side of the positive terminal. In other embodiments, the overlapping region 211 is located at the second half-region 112.
[0046] In this embodiment, as Figure 1 and Figure 2 As shown, the insulating film 2 includes an insulating film body 21 and a first folded portion 22. The insulating film body 21 is annularly arranged and wraps around the outer periphery of the housing 1, and the first and last regions of the insulating film body 21 are overlapped and fixed to form an overlapping region 211. The first folded portion 22 is connected to the insulating film body 21, extends out of the end of the housing 1, and folds to the first end 13 of the housing 1. The above structural design of the insulating film 2 effectively increases the contact area between the insulating film 2 and the housing 1, ensuring the stability of the insulating film 2 wrapped and fixed on the housing 1.
[0047] Optionally, such as Figure 1 and Figure 2 As shown, the battery cell 10 provided in this embodiment also includes a first insulating sheet 3, which is stacked on the first folded portion 22 and covers the first end portion 13. By providing the first insulating sheet 3, insulation effect at the first end portion 13 is ensured. In addition, by stacking the first insulating sheet 3 on the first folded portion 22, gaps are avoided at the connection between the first insulating sheet 3 and the first folded portion 22, ensuring insulation effect on the outer surface of the housing 1.
[0048] In this embodiment, as Figure 1 and Figure 2As shown, the first insulating sheet 3 has a first clearance hole 31, which is used to avoid the battery cell electrode 14 at the first end 13. Optionally, in this embodiment, the first insulating sheet 3 has two spaced-apart first clearance holes 31, which are used to avoid the battery cell electrode 14 at corresponding positions. Optionally, in this embodiment, the shape of the first clearance hole 31 is adapted to the shape of the battery cell electrode 14. In other embodiments, when an explosion-proof valve is provided at the first end 13, the first clearance hole 31 is used to avoid the explosion-proof valve, and the shape of the first clearance hole 31 is adapted to the shape of the explosion-proof valve.
[0049] In this embodiment, the insulating film 2 further includes a second folded portion (not shown in the figure). The second folded portion is connected to the insulating film body 21 and is arranged at intervals relative to the first folded portion 22. The second folded portion extends outward from the end of the housing 1 and folds over to the second end of the housing 1. By providing the second folded portion, the contact area between the insulating film 2 and the housing 1 is further increased, further ensuring the stability of the insulating film 2 wrapped and fixed on the housing 1.
[0050] In this embodiment, as Figure 1 As shown, the battery cell 10 also includes a second insulating sheet 4, which is stacked on the second folded portion and covers the second end. The second insulating sheet 4 has a second clearance hole 41, which is used to avoid the explosion-proof valve at the second end. By providing the second insulating sheet 4, the insulation effect at the second end is ensured. In addition, by stacking the second insulating sheet 4 on the second folded portion, gaps are avoided at the connection between the second insulating sheet 4 and the second folded portion, ensuring the insulation effect on the outer surface of the housing 1. Optionally, in this embodiment, the shape of the second clearance hole 41 is adapted to the shape of the explosion-proof valve. In other embodiments, when two battery cell terminals 14 are provided at the second end, two second clearance holes 41 are provided on the second insulating sheet 4. The two second clearance holes 41 are used to avoid the battery cell terminals 14 at corresponding positions, and the shape of the second clearance holes 41 is adapted to the shape of the battery cell terminals 14.
[0051] like Figure 3As shown, this embodiment also provides a battery cell assembly, which includes at least one pair of battery cells. Each battery cell pair includes two of the aforementioned battery cells 10. The two battery cells 10 of the battery cell pair are stacked sequentially, and the first wall surfaces 11 of the two battery cells 10 face each other. The battery cell assembly provided in this embodiment, by having the first wall surfaces 11 of the two battery cells 10 face each other, ensures that the overlapping area 211 is compressed and fixed by the large surfaces of the two battery cells 10, thereby avoiding the problem of deformation and bulging of the overlapping area 211, avoiding the risk of separation and failure of the overlapping area 211, ensuring the reliability of the overlapping area 211, and improving the insulation performance of the outer periphery of the housing 1. Furthermore, since the insulating film 2 is annularly arranged around the outer periphery of the housing 1, and the beginning and end areas of the insulating film 2 are stacked and fixed to form the overlapping area 211, it facilitates the coating operation on the outer periphery of the housing 1, improving the coating efficiency. It should be noted that in this embodiment, one of the second wall surfaces 12 of each battery cell 10 is placed downwards.
[0052] Optionally, in this embodiment, as Figure 3 As shown, the overlapping regions 211 of the two cells 10 in the cell pair are arranged opposite each other. In this embodiment, the two overlapping regions 211 are staggered. The above arrangement can effectively prevent the overlapping regions 211 from overlapping in two adjacent cells 10, avoid adding an extra thickness of overlapping region 211 to the cell group, and make the force between each cell 10 more balanced.
[0053] It should be noted that the overlapping areas of the two cells 10 in the cell pair can also be arranged in opposite directions. The overlapping areas of the two cells 10 in the cell pair being arranged in opposite directions means that the overlapping area 211 of one of the two cells 10 is located on the side away from the other cell 10, and there is no overlapping area 211 at the point where the two cells 10 of the cell pair are attached.
[0054] It should be noted that in this embodiment, the battery cell assembly may also include a single battery cell 20, so that the number of battery cells 20 in the battery cell assembly can be odd or even. It should also be noted that in this embodiment, the positive and negative terminals of each battery cell 10 are connected in series. Optionally, in this embodiment, in two adjacent battery cells 10, the positive terminal of one battery cell 10 is located below the negative terminal of the other battery cell 10, which facilitates the series connection between adjacent battery cells 10. Furthermore, the above arrangement ensures that the overlapping areas 211 of some adjacent battery cells 10 are arranged opposite each other, and these two overlapping areas 211 are staggered. Additionally, there are some adjacent battery cells 10 without overlapping areas 211, further ensuring the balance of force among the battery cells 10.
[0055] 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 an electric core. The shell (1) comprises two first wall surfaces (11) and two second wall surfaces (12), the two first wall surfaces (11) are oppositely arranged, the two second wall surfaces (12) are oppositely arranged, each first wall surface (11) is connected between the two second wall surfaces (12), and the area of the first wall surface (11) is larger than that of the second wall surface (12); and The insulating film (2) is annularly arranged on the outer periphery of the shell (1), the head and tail regions of the insulating film (2) are fixedly overlapped to form an overlapping region (211), and the overlapping region (211) is located on the first wall surface (11).
2. The electric cell of claim 1, wherein, The head and tail regions of the insulating film (2) are fixedly overlapped to form the overlapping region (211).
3. The electric cell of claim 1, wherein, The two ends of the overlapping region (211) extend to the two ends of the shell (1) respectively.
4. The electric cell of claim 1, wherein, The first wall surface (11) is divided into a first half region (111) and a second half region (112) along the direction in which the two second wall surfaces (12) are oppositely arranged, and the overlapping region (211) is located at the first half region (111) or the second half region (112).
5. The battery cell of any one of claims 1 to 4, wherein, The length of the shell (1) is 400mm-1200mm, the width of the shell (1) is 50mm-120mm, and the height of the shell (1) is 80mm-250mm.
6. The battery cell of any one of claims 1 to 4, wherein, The insulating film (2) comprises a first folding part (22), the first folding part (22) extends out of the end of the shell (1), and the first folding part (22) is folded to the first end (13) of the shell (1).
7. The electric cell of claim 6, wherein, The electric core further comprises: A first insulating sheet (3) is overlapped on the first folding part (22) and covers the first end (13).
8. The electric cell of claim 7, wherein, The first insulating sheet (3) is provided with a first avoiding hole (31) for avoiding the explosion-proof valve or the electric core pole (14) at the first end (13).
9. The electric cell of claim 6, wherein, The insulating film (2) further comprises: A second folding part is oppositely arranged with the first folding part (22), the second folding part extends out of the end of the shell (1), and the second folding part is folded to the second end of the shell (1).
10. The electric cell of claim 9, wherein, The electric core further comprises: A second insulating sheet (4) is overlapped on the second folding part and covers the second end, and the second insulating sheet (4) is provided with a second avoiding hole (41) for avoiding the explosion-proof valve or the electric core pole (14) at the second end.
11. An electric cell pack, characterized by, The application further relates to at least one pair of electric cores, the electric core pair comprises two electric cores as claimed in any one of claims 1-10, the two electric cores of the electric core pair are sequentially overlapped and arranged, and the first wall surfaces (11) of the two electric cores are opposite.
12. The battery cell pack of claim 11, wherein, The overlapping regions (211) of the two electric cores of the electric core pair are oppositely arranged, and the two overlapping regions (211) are staggered with each other.