cell

Abstract

The utility model provides a kind of electric core, including cover plate assembly, shell, bare electric core, first insulating support, second insulating support and insulating film, bare electric core is set in shell, cover plate assembly seals shell, the end surface of bare electric core has the direction extension of tab towards cover plate assembly, insulating film is wrapped in the peripheral surface of bare electric core, first insulating support and second insulating support are set in the side of cover plate assembly close to shell, first insulating support and second insulating support are connected along the thickness direction of tab, and the connecting position of first insulating support and second insulating support forms accommodating through-hole, tab is arranged between first insulating support and second insulating support, and tab is at least partially set in accommodating through-hole.In the process of the relative connection of first insulating support and second insulating support, the surface of accommodating through-hole contacts tab and gathers tab along its thickness direction, reduces the complexity degree of electric core processing procedure, improves electric core processing efficiency and process stability, reduces cost.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell. Background Technology

[0002] In current battery cell assembly technology, an insulating support needs to be placed on the end face of the bare cell. The insulating support positions the tabs of the bare cell. To ensure that the tabs can pass through the positioning holes of the insulating support and achieve proper positioning between the bare cell and the insulating support, the tabs need to be folded up and welded in place, so that the thickness of the tabs can fit through the positioning holes of the insulating support. This assembly method of folding up and welding the tabs increases the complexity of the cell manufacturing process and the cost of auxiliary materials, resulting in complex cell manufacturing processes, low processing efficiency, and high costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing battery cell processing technology, which is complex, resulting in low processing efficiency and high cost, and to provide a battery cell.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A battery cell includes a cover plate assembly, a housing, a bare battery cell, a first insulating support, a second insulating support, and an insulating film. The bare battery cell is disposed in the housing, and the cover plate assembly seals the housing. The end face of the bare battery cell has a tab extending toward the cover plate assembly. The insulating film wraps around the periphery of the bare battery cell. The first insulating support and the second insulating support are disposed on the side of the cover plate assembly near the housing. The first insulating support and the second insulating support are detachably connected along the thickness direction of the tab, and the connection position of the first insulating support and the second insulating support forms a receiving through hole. The tab is arranged between the first insulating support and the second insulating support, and at least part of the tab is disposed in the receiving through hole.

[0006] The battery cell is divided into two detachable insulating supports, a first insulating support and a second insulating support, along the thickness direction of the tab. The connection between the first and second insulating supports forms a receiving through-hole, facilitating the insertion of the tab portion into this hole. During the relative connection of the first and second insulating supports, the receiving through-hole contacts the surface of the tab and can retract the tab along its thickness direction. This eliminates the need for pre-retraction of the tab before assembly relative to the insulating supports, reducing the complexity of the battery cell manufacturing process, improving manufacturing efficiency and process stability, and lowering manufacturing costs.

[0007] Preferably, a plurality of connecting structures are formed at the connection position of the first insulating support and the second insulating support, the connecting structures being staggered from the receiving through hole, and the first insulating support and the second insulating support being detached and connected through each of the connecting structures.

[0008] By setting multiple connection structures at the connection point of the first insulating bracket and the second insulating bracket, disassembly and connection can be achieved, and the first insulating bracket and the second insulating bracket can be connected at multiple points, thereby improving the fixation reliability of the first insulating bracket and the second insulating bracket.

[0009] Preferably, the receiving through hole is arranged between at least two of the connecting structures.

[0010] By placing the receiving through hole between the two connecting structures, the fixing ability of the connecting structures to the receiving through hole is improved, enabling the receiving through hole to more reliably position the electrode tab.

[0011] Preferably, the connection structure includes a mounting portion and an insertion portion, wherein the mounting portion is located at the connection position of one of the first insulating bracket and the second insulating bracket, and the insertion portion is located at the connection position of the other, and the insertion portion is inserted into the mounting portion to fix the first insulating bracket and the second insulating bracket.

[0012] Compared to other solutions for detachable connection between the first and second insulating supports, this method achieves detachable connection by setting an insertion part and an installation part for plugging. The connection structure is relatively simple, which is not only easy to connect but also easy to disassemble. This reduces the difficulty of assembling the first and second insulating supports and simplifies the cell processing steps.

[0013] Preferably, the end of the insulating film has a receiving portion, and the insertion portion is inserted into the receiving portion of the insulating film to fix the insulating film.

[0014] By setting a receiving portion on the surface of the insulating film, and inserting the first insulating bracket and the second insulating bracket into the receiving portion of the insulating film to fix the insulating film at the same time, the hot-melt process is no longer required to connect the insulating bracket and the insulating film. This solves the product quality problems caused by the high temperature generated by the hot-melt process, and also reduces the complexity of the cell processing steps, improving the cell processing efficiency and process stability.

[0015] Preferably, the insulating film includes an insulating film body and a protrusion located at an end, the protrusion extending to the connection position of the first insulating support and the second insulating support, the surface of the protrusion being provided with a through hole to form the receiving portion, the through hole being for the insertion portion to pass through.

[0016] A protrusion is provided on the insulating film body of the insulating film, extending to the connection position of the first insulating support and the second insulating support. An insertion part is provided through a through hole, so that the insulating film is fixed at the same time by disassembling and connecting the first insulating support and the second insulating support, which facilitates the subsequent battery cell casing process.

[0017] Preferably, the end of the insertion portion has an annular protrusion, the diameter of which is larger than the diameter of the opening in the mounting portion for receiving the insertion portion.

[0018] This structural design features an annular protrusion at the end of the insertion part with a diameter larger than the opening diameter of the mounting part. This makes it more difficult to pull out the insertion part after it is inserted into the opening of the mounting part, thereby improving the connection reliability of the first insulating bracket relative to the second insulating bracket and ensuring the positioning effect of the through hole on the tab.

[0019] Preferably, the insertion part has a structure that is either a columnar structure or a barbed structure, or one or more of these.

[0020] Preferably, the mounting portion has a structure that is one or more of a hole structure or a barb structure.

[0021] The insertion part or mounting part can be connected in various ways, including the interlocking of hole-like structures and column-like structures, or the positioning of barbed structures relative to other barbed structures or hole-like structures, so as to improve the reliability of the connection between the first insulating support and the second insulating support.

[0022] Preferably, both ends of the bare cell have tabs extending toward the cover plate assembly, and the first insulating support and the second insulating support are provided in two sets corresponding to the two tabs, and the receiving through holes formed by the two sets of the first insulating support and the second insulating support respectively accommodate the two tabs.

[0023] Preferably, the housing has two openings corresponding to the two end faces of the bare battery cell, the two cover plate assemblies respectively seal the two openings of the housing, and the two sets of first insulating brackets and second insulating brackets are provided corresponding to the two cover plate assemblies.

[0024] The casing has two openings on the two sides of the bare cell, forming a through-structure. This allows the tabs on the two sides of the bare cell to be led out from the two openings of the casing, providing a cell structure with tabs on both sides to meet the cell arrangement requirements.

[0025] The positive and progressive effects of this utility model are as follows:

[0026] The battery cell is divided into two detachable insulating supports, a first insulating support and a second insulating support, along the thickness direction of the tab. The connection between the first and second insulating supports forms a receiving through-hole, facilitating the insertion of the tab portion into this hole. During the relative connection of the first and second insulating supports, the receiving through-hole contacts the surface of the tab and can retract the tab along its thickness direction. This eliminates the need for pre-retraction of the tab before assembly relative to the insulating supports, reducing the complexity of the battery cell manufacturing process, improving manufacturing efficiency and process stability, and lowering manufacturing costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the bare battery cell of Embodiment 1 of this utility model.

[0028] Figure 2 This is a schematic diagram (I) of the battery cell structure of Embodiment 1 of this utility model.

[0029] Figure 3 This is a schematic diagram (II) of the battery cell structure of Embodiment 1 of this utility model.

[0030] Figure 4 This is an exploded view of the insulating support of Embodiment 1 of this utility model.

[0031] Figure 5 This is a schematic diagram of the combined state of the insulating support in Embodiment 1 of this utility model.

[0032] Figure 6 This is a schematic diagram showing the exploded state of the insulating support relative to the tab in Embodiment 1 of this utility model.

[0033] Figure 7 This is a schematic diagram of the combined state of the insulating support and the electrode tabs in Embodiment 1 of this utility model.

[0034] Figure 8 This is a schematic diagram of the structure of the first insulating support in Embodiment 1 of this utility model.

[0035] Figure 9 for Figure 8 A magnified view of part B in the middle section.

[0036] Figure 10 This is a schematic diagram showing the exploded state of the insulating support in other embodiments of the present invention.

[0037] Figure 11 This is a schematic diagram of the combined state of the insulating bracket in other embodiments of this utility model.

[0038] Figure 12 This is a schematic diagram of the battery cell structure of Embodiment 2 of this utility model.

[0039] Figure 13 for Figure 12 A magnified view of part C in the middle.

[0040] Figure 14 This is a schematic diagram of the unfolded state of the insulating film in Embodiment 2 of this utility model.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100 cells

[0043] Cover assembly 10

[0044] Casing 20

[0045] Bare cell 30

[0046] Peripheral surface 31, end face 32, tab 33, thickness direction A

[0047] Insulating bracket 40, first insulating bracket 41, second insulating bracket 42, and receiving through hole 43

[0048] Insulating film 50, receiving part 51

[0049] Insulating film body 52, protrusion 53, first protrusion 531, second protrusion 532

[0050] Connection structure 60, mounting part 61, insertion part 62, annular protrusion 621

[0051] Finishing tape 70 Detailed Implementation

[0052] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0053] Example 1

[0054] like Figures 1-3 As shown, this utility model provides a battery cell 100, which includes a cover plate assembly 10, a housing 20, a bare battery cell 30, an insulating support 40, and an insulating film 50. Wherein, as... Figure 1 As shown, the bare battery cell 30 has outwardly extending tabs 33 on both end faces 32, namely the positive tab 33 and the negative tab 33. Figure 2 and Figure 3As shown, the bare battery cell 30 is disposed in the housing 20. In this embodiment, the housing 20 has two openings on each of the two end faces 32 corresponding to the bare battery cell 30. Two cover plate assemblies 10 respectively seal the two openings of the housing 20. Two insulating supports 40 are respectively disposed on the side of the cover plate assembly 10 near the housing 20. The insulating supports 40 are provided with receiving through holes 43. The two tabs 33 of the bare battery cell 30 pass through the receiving through holes 43 on the two insulating supports 40 respectively, and the tabs 33 are positioned through the receiving through holes 43. Specifically, as shown... Figure 2 As shown, before the bare battery cell 30 enters the housing 20, an insulating film 50 is wrapped around the circumferential surface 31 of the bare battery cell 30 and secured with finishing tape 70. Simultaneously, two insulating supports 40 are installed on the two end faces 32 of the bare battery cell 30 to position the positive and negative tabs 33 respectively. To facilitate the demonstration of the bare battery cell 30, insulating supports 40, and insulating film 50 housed inside the housing 20, Figure 3 In the middle, the housing 20 and the cover plate assemblies 10 on both sides are shown in dashed lines.

[0055] like Figure 4 and Figure 5 As shown, in this embodiment, each insulating bracket 40 is composed of a first insulating bracket 41 and a second insulating bracket 42. A receiving through hole 43 is formed at the connection position of the first insulating bracket 41 and the second insulating bracket 42 to accommodate the electrode tab 33. Simultaneously, two connecting structures 60 are also formed at the connection position of the first insulating bracket 41 and the second insulating bracket 42. These two connecting structures 60 are staggered with the receiving through hole 43 to avoid affecting the receiving through hole 43's accommodation of the electrode tab 33. The first insulating bracket 41 and the second insulating bracket 42 are detached and connected through these two connecting structures 60.

[0056] like Figure 6 and Figure 7 As shown, the first insulating bracket 41 and the second insulating bracket 42 are separately arranged and detachably connected along the thickness direction A of the tab 33. By assembling the first insulating bracket 41 and the second insulating bracket 42 relative to the tab 33 along the thickness direction A, it is convenient for the part of the tab 33 connected to the body of the bare cell 30 to be inserted into the receiving through hole 43. At the same time, during the relative connection of the first insulating bracket 41 and the second insulating bracket 42, the receiving through hole 43 contacts the surface of the tab 33 and can retract the tab 33 along the thickness direction A, so that the tab 33 does not need to be retracted in advance before being assembled with the insulating bracket 40, reducing the complexity of the cell 100 processing steps and improving the processing efficiency and process stability of the cell 100.

[0057] In this embodiment, two sets of connecting structures 60 are provided at the connection position of the first insulating support 41 and the second insulating support 42. By arranging these two sets of connecting structures 60 on both sides of the receiving through hole 43, the fixing ability of the connecting structures 60 to the receiving through hole 43 is improved, so that the receiving through hole 43 can more reliably position the electrode tab 33. In other embodiments, the number of connecting structures 60 can be further increased, so that there are multiple points of connection between the first insulating support 41 and the second insulating support 42, thereby improving the fixing reliability of the first insulating support 41 and the second insulating support 42.

[0058] This embodiment further provides a preferred structural arrangement for the connection structure 60 that enables the detachable connection between the first insulating support 41 and the second insulating support 42, specifically as follows: Figure 4 As shown, the connection structure 60 includes an insertion portion 62 disposed on the first insulating support 41 and a mounting portion 61 disposed on the second insulating support 42. The relatively protruding portion of the insertion portion 62 is inserted into the relatively recessed portion of the mounting portion 61 to fix the relative position between the first insulating support 41 and the second insulating support 42. Compared with other solutions for detaching and connecting the first insulating support 41 and the second insulating support 42, this connection structure 60 is simpler, facilitating both connection and disassembly, reducing the difficulty of assembling the first insulating support 41 and the second insulating support 42, and simplifying the processing steps of the battery cell 100.

[0059] Specifically, such as Figure 8 and Figure 9 As shown, the insertion part 62 is located on the lower surface of the first insulating bracket 41 and is cylindrical in shape. At the end of the insertion part 62, there is an annular protrusion 621. The diameter of this annular protrusion 621 is relatively large and is larger than the diameter of the opening in the mounting part 61 on the second insulating bracket 42 used to accommodate the insertion part 62. This makes it more difficult to pull out the insertion part 62 after it is inserted into the opening of the mounting part 61, thereby improving the connection reliability of the first insulating bracket 41 relative to the second insulating bracket 42 and ensuring the positioning effect of the through hole 43 on the tab 33. To further improve the connection reliability of the first insulating bracket 41 and the second insulating bracket 42, they can be fixed by welding or bonding after being connected by the connecting structure 60.

[0060] Of course, the specific structural configuration of the connection structure 60 provided in this embodiment is only a preferred means of achieving disassembly and connection. In other embodiments, the connection structure 60 can also adopt other structural forms to achieve disassembly and connection between the first insulating bracket 41 and the second insulating bracket 42. For example, the insertion part 62 can adopt a columnar structure different from that in this embodiment to be inserted into the corresponding hole structure of the mounting part 61 to achieve disassembly and connection. For example, a square column can be inserted into a square hole to achieve disassembly and connection. Alternatively, the insertion part 62 and the mounting part 61 can adopt a barb structure to achieve relative disassembly and connection.

[0061] like Figure 6 and Figure 7 As shown, in this embodiment, the first insulating support 41 and the second insulating support 42 are symmetrically arranged in the thickness direction A of the tab 33. By making the first insulating support 41 and the second insulating support 42 symmetrical with respect to the tab 33, the number of molds required for processing can be reduced, facilitating the unified processing of the first insulating support 41 and the second insulating support 42. Of course, in other embodiments, the first insulating support 41 and the second insulating support 42 can also be formed with a completely asymmetrical structure to achieve the purpose of combining and closing the tab 33. For example, they can be formed with... Figure 10 and Figure 11 The first insulating bracket 41 and the second insulating bracket 42, which are asymmetrical in structure, are assembled to form a complete insulating bracket 40. The electrode tab 33 is gathered by the relative assembly process of the first insulating bracket 41 and the second insulating bracket 42. The specific structural form adopted by the first insulating bracket 41 and the second insulating bracket 42 can be set as needed according to the actual product requirements.

[0062] Example 2

[0063] This embodiment also provides a battery cell 100, whose structure is largely the same as that of the battery cell 100 provided in Embodiment 1. The main difference is that in this embodiment, the insulating film 50 of the battery cell 100 is connected to the insulating support 40 using a connection structure 60 between the first insulating support 41 and the second insulating support 42. The specific structure is as follows: Figure 12-14 As shown, a receiving portion 51 is provided at the end of the insulating film 50. The insertion portion 62 on the first insulating bracket 41 is first inserted into the receiving portion 51 on the insulating film 50, and then inserted into the mounting portion 61 on the second insulating bracket 42, so that the first insulating bracket 41 can be connected to the insulating film 50 and the second insulating bracket 42 respectively.

[0064] In this embodiment, the connection structure 60 between the first insulating support 41 and the second insulating support 42 is located near the end face 32 of the battery cell 100, which is relatively far from the portion of the insulating film 50 that wraps around the battery cell 100. Therefore, in this embodiment, as... Figure 14As shown, the insulating film 50 includes a protrusion 53 extending outward from the insulating film body 52 portion used to wrap the battery cell 100. The protrusion 53 is disposed at the end of the insulating film 50 and extends to the connection position of the first insulating support 41 and the second insulating support 42. A through hole is provided on the surface of the protrusion 53 to form a receiving portion 51, which is used for the insertion portion 62 to pass through.

[0065] Specifically, such as Figure 13 As shown in the figure, in this embodiment, along the outward extending direction, the protrusion 53 sequentially includes a first protrusion 531 and a second protrusion 532. The first protrusion 531 extends along the end face 32 of the bare cell 30, while the second protrusion 532 extends outward from the end face 32 of the bare cell 30 in a direction perpendicular to the end face 32. The receiving portion 51 is disposed on the second protrusion. This structural arrangement allows the receiving portion 51 to be located as close as possible to the end face 32 region of the bare cell 30, reducing the space occupied on the outer side of the peripheral surface 31 of the bare cell 30. Furthermore, as can be seen from the figure, the two second protrusions 532 overlap, and the receiving portions 51 on the second protrusions 532 also overlap. The insertion portion 62 of the first insulating bracket 41 passes through the receiving portions 51 on these two second protrusions 532 sequentially. This structural arrangement improves the fixing effect.

[0066] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An electric cell, characterized by, The device includes a cover plate assembly, a housing, a bare battery cell, a first insulating support, a second insulating support, and an insulating film. The bare battery cell is disposed in the housing, and the cover plate assembly seals the housing. The end face of the bare battery cell has a tab extending toward the cover plate assembly. The insulating film wraps around the periphery of the bare battery cell. The first insulating support and the second insulating support are disposed on the side of the cover plate assembly near the housing. The first insulating support and the second insulating support are detachably connected along the thickness direction of the tab, and the connection position of the first insulating support and the second insulating support forms a receiving through hole. The tab is arranged between the first insulating support and the second insulating support, and at least part of the tab is disposed in the receiving through hole.

2. The cell of claim 1, wherein, Multiple connecting structures are also formed at the connection position of the first insulating bracket and the second insulating bracket. The connecting structures are arranged in a staggered manner from the receiving through hole, and the first insulating bracket and the second insulating bracket are detached and connected through each of the connecting structures.

3. The cell of claim 2, wherein, The receiving through-hole is arranged between at least two of the connecting structures.

4. The cell of claim 2, wherein, The connection structure includes a mounting part and an insertion part. The mounting part is located at the connection position of one of the first insulating brackets and the second insulating bracket, and the insertion part is located at the connection position of the other. The insertion part is inserted into the mounting part to fix the first insulating bracket and the second insulating bracket.

5. The cell of claim 4, wherein, The insulating film has a receiving portion at one end, and the insertion portion is inserted into the receiving portion of the insulating film to fix the insulating film.

6. The cell of claim 5, wherein, The insulating film includes an insulating film body and a protrusion located at an end. The protrusion extends to the connection position of the first insulating support and the second insulating support. The surface of the protrusion is provided with a through hole to form the receiving portion, and the through hole is used for the insertion portion to pass through.

7. The cell of claim 4, wherein, The insertion part has an annular protrusion at its end, the diameter of which is larger than the diameter of the opening in the mounting part for accommodating the insertion part.

8. The cell of claim 4, wherein, The insertion part has a structural form that is either a columnar structure or a barbed structure, or one or more of these. And / or, the mounting portion may be one or more of a hole structure or a barb structure.

9. The cell of any of claims 1-8, wherein, Both sides of the bare battery cell have tabs extending toward the cover plate assembly. The first insulating support and the second insulating support are provided in two sets corresponding to the two tabs. The receiving through holes formed by the two sets of the first insulating support and the second insulating support respectively accommodate the two tabs.

10. The cell of claim 9, wherein, The housing has two openings corresponding to the two end faces of the bare battery cell. The two cover plate assemblies respectively seal the two openings of the housing. The two sets of first insulating brackets and second insulating brackets are provided corresponding to the two cover plate assemblies.

Images