Battery cell cover plate and battery cell

Abstract

The utility model discloses a battery cell cover plate and a battery cell, and belongs to the technical field of lithium batteries. The battery cell cover plate comprises a cover plate main body, a terminal connecting hole and a sealing hole are respectively formed in the cover plate main body, the side surface of the cover plate main body around the sealing hole is sunken to form a groove, and a liquid injection hole is formed in the bottom surface of the groove; when the sealing plate is installed in the groove, the sealing plate seals the sealing hole, covers the liquid injection hole and seals the liquid injection hole at the same time. According to the invention, the use of a sealing sheet is cancelled, the welding process of the sealing sheet is reduced, and the sealing plate is welded and sealed only through one welding process, so that the welding yield is improved, the battery cell manufacturing efficiency and the battery cell yield are improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and more specifically, to a battery cover plate and a battery. Background Art

[0002] With the process of economic globalization and the continuous increase in energy demand, the pursuit of new energy storage units has quickly become the focus of attention in the field of new energy. Lithium-ion batteries, which have the advantages of no memory effect, low self-discharge, high energy density, long cycle life, clean and pollution-free, have begun to be widely used in electric and hybrid vehicles and portable mobile power sources. As the core energy storage unit, the development of batteries has attracted much attention.

[0003] Usually, the battery cell is composed of a winding core and a cover plate. The cover plate has a liquid injection hole. After the winding core and the cover plate are assembled, the electrolyte is added through the liquid injection hole. The position of the liquid injection hole of the conventional battery cell cover plate is separated from the position of the sealing plate on the cover plate. In this case, the sealing sheet of the liquid injection hole needs to be welded to seal the liquid injection hole and the sealing plate of the cover plate needs to be welded to seal the cover plate before and after the battery cell process. The sealing of the inside and outside of the battery cell is completed through two weldings. Too many welding processes are not conducive to improving the welding yield. Utility Model Content

[0004] The utility model provides a battery cover plate and a battery cell, which improves the setting position of the injection hole, seals the injection hole and the cover plate simultaneously through one-time sealing welding, reduces welding procedures, and improves welding yield.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0006] A battery cover plate, comprising:

[0007] A cover plate body, on which a terminal connection hole and a sealing hole are respectively provided, wherein an external terminal assembly is arranged in the terminal connection hole, and the position of the sealing hole is arranged corresponding to the position of the tab of the battery cell;

[0008] The side surface of the cover plate body around the sealing hole is concave to form a groove, and a liquid injection hole is arranged on the bottom surface of the groove; a sealing plate is installed in the groove, and when the sealing plate seals the sealing hole, it also seals the liquid injection hole.

[0009] Furthermore, a sealing nail is installed in the injection hole.

[0010] Furthermore, it also includes a cover plate connecting piece and an insulating plate, wherein the insulating plate is located in the sealing hole;

[0011] The cover plate connecting piece is located on the inner side of the cover plate body, one end of which is connected to the terminal assembly, and the other end of which is used to connect to the tab of the battery cell.

[0012] Furthermore, a bent connecting end is provided at one end of the cover plate connecting piece for connecting with the pole lug, and the bent connecting end passes through the insulating plate and extends to the outside of the cover plate body and is bent.

[0013] Furthermore, a through hole is provided on the insulating plate for the bent connecting end to extend out.

[0014] Furthermore, one side of the insulating plate is recessed toward the other side to form an insulating plate groove, the through hole is located on a side of the insulating plate groove, and when the bent connecting end is bent, it is bent into the insulating plate groove.

[0015] The utility model also provides a battery core, comprising the battery core cover plate, wherein the battery core cover plate is located at one end of the battery core.

[0016] Furthermore, the pole lug is also connected to a pole lug connecting piece, and the cover plate connecting piece is connected to the pole lug via the pole lug connecting piece.

[0017] Furthermore, a stop frame is provided between the battery cell cover plate and the battery cell stack, and the stop frame is used to fix the cover plate connecting piece and the tab connecting piece.

[0018] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects: the battery cover plate of the utility model is provided with a terminal connection hole and a sealing hole, the side surface of the cover plate body around the sealing hole is concave to form a groove, and the injection hole is provided on the bottom surface of the groove; when the sealing plate is installed in the groove, the sealing plate seals the sealing hole while covering the injection hole and sealing the injection hole at the same time. The use of the sealing sheet is eliminated, the welding process of the sealing sheet is reduced, and the sealing plate is welded and sealed by only one welding process, which improves the welding yield, improves the battery process efficiency and battery yield, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the arrangement of the injection hole in the embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the installation of the sealing block in the embodiment of the utility model;

[0021] Figure 3a This is a schematic diagram of the battery cell after assembly in the embodiment of the utility model;

[0022] Figure 3b This is a schematic diagram of the embodiment of the utility model after the sealing block is installed;

[0023] Figure 3c This is a schematic diagram of installing a sealing nail in the injection hole in the embodiment of the utility model;

[0024] Figure 3dThis is a schematic diagram of installing a sealing plate in an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the arrangement of the injection holes in the comparative example;

[0026] Figure 5 This is a schematic diagram of observing the outer side of the cover plate body in the comparative example;

[0027] Figure 6 This is a schematic diagram of observing the inner side of the cover plate body in the comparative example;

[0028] Figure 7 Schematic diagram of the cover plate connecting piece structure;

[0029] Figure 8 Schematic diagram of the cover plate and the stop frame in the comparative example.

[0030] Description of labels:

[0031] 1. Cover plate body; 2. Sealing plate; 3. Sealing nail; 4. Sealing sheet; 5. Sealing block;

[0032] 11. groove; 12. injection hole;

[0033] 6. Cover plate connecting piece; 61. Bend connecting end;

[0034] 7. Tab connecting piece; 8. Tab; 9. Stop frame; 10. Terminal assembly; 13. Insulating plate. DETAILED DESCRIPTION

[0035] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0036] The battery cells used in this embodiment and the comparative example are all biased battery cells, such as Figure 4-Figure 8 As shown, the battery cell structure in the comparative example is used for illustration, and the offset battery cell includes a stacked core and a battery cell cover plate. The battery cell structure and the cover plate structure in the comparative example and the embodiment are consistent, and only the injection hole in the embodiment is arranged differently from that in the comparative example.

[0037] The tab 8 is offset to one side of the stacked core, and the cell cover is located at one end of the stacked core in the cell, wherein the inner side of one end of the cover connecting piece 6 is connected to the tab 8, and the outer side of the other end is connected to the terminal assembly 10. The terminal assembly 10 includes rivets and terminals for externally connecting the tab 8.

[0038] like Figure 5 and Figure 6As shown, in this embodiment, the inner side is the side close to the battery cell, and the outer side is the side away from the battery cell.

[0039] The stacked core is described as a double stacked core, each stacked core is connected to a pole ear 8, each pole ear 8 is also connected to a pole ear connecting piece 7, and the cover plate connecting piece 6 is connected to the pole ear 8 through the pole ear connecting piece 7. Specifically, the pole ear connecting piece 7 is L-shaped, one end is connected to the pole ear 8, and the other end is connected to the cover plate connecting piece 6.

[0040] A stop frame 9 is also provided between the cell cover and the stacked core, and the stop frame 9 is used to fix the cover connecting piece 6 and the tab connecting piece 7 .

[0041] like Figure 1 and Figure 2 As shown, a cell cover provided in this embodiment includes a cover body 1. The cover body 1 is provided with a terminal connection hole and a sealing hole, respectively. An external terminal assembly 10 is provided in the terminal connection hole, and the position of the sealing hole is provided corresponding to the position of the tab 8 of the cell. Moreover, the side surface of the cover body 1 around the sealing hole is recessed to form a groove 11, and the groove 11 is located on the outer side of the cover body 1, and a liquid injection hole 12 is provided on the bottom surface of the groove 11; a sealing plate 2 is installed in the groove 11, and when the sealing plate 2 seals the sealing hole, the liquid injection hole 12 is sealed at the same time.

[0042] Furthermore, a sealing nail 3 is installed in the injection hole 12 to seal the injection hole 12 to prevent the electrolyte in the battery cell from leaking out.

[0043] Recombination Figure 5-Figure 8 As shown, the battery cell assembly further includes a cover plate connecting piece 6 and an insulating plate 13, and the insulating plate 13 is located in the sealing hole. The cover plate connecting piece 6 is located on the inner side of the cover plate body 1, one end of which extends to the terminal connection hole, and the outer side of the end is connected to the terminal assembly 10, and the other end of which extends to the sealing hole, and the inner side of the end is connected to the pole ear 8 of the battery cell.

[0044] A bent connection end 61 is provided at one end of the cover plate connecting piece 6 for connecting with the pole ear 8, and the bent connection end 61 passes through the insulating plate 13 and extends to the outside of the cover plate body 1 and is bent. In this embodiment, two bent connection ends 61 are provided, which are respectively located on both sides of the cover plate connecting piece 6. A through hole is provided on the insulating plate 13 for the bent connection end 61 to extend out. One side of the insulating plate 13 is recessed toward the other side to form an insulating plate groove, and the through hole is located on the side of the insulating plate groove. When the bent connection end 61 is bent, it is bent into the insulating plate groove.

[0045] One end of the tab connecting piece 7 connected to the cover connecting piece 6 is specifically connected to the bent connecting end 61 of the cover connecting piece 6 , and extends out from the through hole on the insulating plate 13 together with the bent connecting end 61 , and is bent into the insulating plate groove together.

[0046] In this embodiment, an offset cell structure is adopted, and a terminal connection hole and a sealing hole are opened on the cover plate of the cell. A terminal assembly 10 is installed in the terminal connection hole. The sealing hole is used for extending and bending one end of the pole ear connecting piece 7 connected to the cover plate connecting piece 6, and a sealing plate 2 is used to seal the sealing hole.

[0047] In the comparative example, before improvement, Figure 4 As shown, the sealing plate 2 needs to be used to seal the sealing hole, and the sealing sheet 4 needs to be used to seal the injection hole 12. Two welding processes are required, namely, welding and sealing the sealing plate 2 and welding and sealing the sealing sheet 4, which is not conducive to improving the welding yield.

[0048] After improvement, such as Figure 1 and Figure 2 As shown, in this embodiment, the side surface of the cover plate body 1 around the sealing hole is recessed to form a groove 11, and the injection hole 12 is opened on the bottom surface of the groove 11; when the sealing plate 2 is installed in the groove 11, the sealing plate 2 seals the sealing hole while covering the injection hole 12 and sealing the injection hole 12 at the same time. The sealing plate 2 is welded and sealed through only one welding process, which improves the welding yield, improves the battery cell process efficiency and battery cell yield, and reduces costs. In this embodiment, the use of the sealing sheet 4 is eliminated, and the welding process of the sealing sheet 4 is subtracted, which improves the battery cell process efficiency and welding yield.

[0049] like Figure 3a-3d It should be noted that after the battery cover is installed and before the electrolyte is injected, a rubber sealing block 5 is installed in the sealing hole for protection, and then the electrolyte is injected to prevent the electrolyte from contaminating the connecting piece during the injection process. After the electrolyte is injected, the battery is transferred to the welding process, the sealing block 5 is taken out, the sealing plate 2 is installed and welded to the cover body 1 to complete the sealing of the battery. The sealing block 5 is used for protection after the battery assembly is completed, and before the sealing plate 2 is welded and sealed. It can be recycled to save energy and protect the environment.

[0050] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and that the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A battery cover, characterized in that: include, A cover plate body (1) is provided with a terminal connection hole and a sealing hole, respectively, an external terminal assembly (10) is arranged in the terminal connection hole, and the position of the sealing hole is arranged corresponding to the position of the pole ear (8) of the battery cell; The side surfaces of the cover plate body (1) around the sealing hole are recessed to form a groove (11), and a liquid injection hole (12) is provided on the bottom surface of the groove (11); a sealing plate (2) is installed in the groove (11), and when the sealing plate (2) seals the sealing hole, it also seals the liquid injection hole (12).

2. The cell cover according to claim 1, characterized in that: A sealing nail (3) is also installed in the liquid injection hole (12).

3. The cell cover plate according to claim 1, characterized in that: It also includes a cover plate connecting piece (6) and an insulating plate (13), wherein the insulating plate (13) is located in the sealing hole; The cover plate connecting piece (6) is located on the inner side of the cover plate body (1), one end of which is connected to the terminal assembly (10), and the other end of which is used to be connected to the pole ear (8) of the battery cell.

4. The cell cover plate according to claim 3, characterized in that: A bent connection end (61) is provided at one end of the cover plate connecting piece (6) for connecting with the pole lug (8), and the bent connection end (61) passes through the insulating plate (13), extends to the outside of the cover plate body (1) and is bent.

5. The cell cover plate according to claim 4, characterized in that: The insulating plate (13) is provided with a through hole for the bent connecting end (61) to extend out.

6. The cell cover plate according to claim 5, characterized in that: One side of the insulating plate (13) is recessed in a direction toward the other side to form an insulating plate groove, the through hole is located on the side of the insulating plate groove, and when the bent connection end (61) is bent, it is bent into the insulating plate groove.

7. A battery cell, characterized in that: The battery cell cover comprises the battery cell cover according to any one of claims 1 to 6, wherein the battery cell cover is located at one end of the battery cell.

8. The battery cell according to claim 7, characterized in that: The pole lug (8) is also connected to a pole lug connecting piece (7), and the cover plate connecting piece (6) is connected to the pole lug (8) via the pole lug connecting piece (7).

9. The battery cell according to claim 7, characterized in that: A stop frame (9) is also provided between the battery cover plate and the battery core stack, and the stop frame (9) is used to fix the cover plate connecting piece (6) and the pole ear connecting piece (7).

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