Lithium battery cover plate riveting structure

Abstract

The utility model discloses a lithium battery cover plate riveting structure which is characterized by comprising a positive plate, a negative plate, a positive gasket, a negative gasket, a cover plate sheet, a lower support, a positive rivet and a negative rivet, the cover plate sheet is arranged on the upper side of the lower support, and the positive plate and the positive gasket are arranged at one end of the upper side of the cover plate sheet. The cathode plate and the cathode gasket are arranged at the other end of the upper side of the cover plate sheet, the anode rivet sequentially penetrates through one end of the lower bracket, one end of the cover plate sheet, the anode gasket and an anode rivet hole of the anode plate from bottom to top, and the cathode rivet sequentially penetrates through the other end of the lower bracket, the other end of the cover plate sheet, the cathode gasket and a cathode rivet hole of the cathode plate from bottom to top; the anode rivet and the cathode rivet are of a step-shaped structure with the upper end diameter smaller than the lower end diameter. According to the utility model, the damage to the strength of the copper-aluminum friction welding joint is avoided, and the problem that the rivet is separated and falls off because the tension value of the rivet is reduced is solved.

Description

Technical Field

[0001] The utility model relates to a riveting structure, in particular to a lithium battery cover plate riveting structure, belonging to the technical field of lithium batteries. Background Art

[0002] The rivets of lithium battery cover plates in the prior art are usually cylindrical structures. When riveting, the force on the upper end of the rivet is the entire end face of the upper end of the rivet, so that the upper end of the rivet expands to achieve a fixing effect. Since many common negative electrode rivets currently use friction welding to weld copper and aluminum into a composite structure, the rivet as a whole expands during riveting, which affects the strength of the copper-aluminum friction weld at the lower end of the rivet, and to a certain extent affects the tensile value of the rivet, so there is a risk of rivet separation and falling off. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a lithium battery cover plate riveting structure to solve the problem that the lithium battery rivets in the prior art expand as a whole and affect the pulling force value, thereby separating and falling off.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A lithium battery cover plate riveting structure comprises a positive plate, a negative plate, a positive gasket, a negative gasket, a cover plate, a lower bracket, a positive rivet and a negative rivet, the cover plate is arranged on the upper side of the lower bracket, the positive plate and the positive gasket are arranged at one end of the upper side of the cover plate, and the negative plate and the negative gasket are arranged at the other end of the upper side of the cover plate, the positive plate, the positive gasket, one end of the cover plate and one end of the lower bracket are provided with positive rivet holes that pass through from top to bottom, the negative plate, the negative gasket, the other end of the cover plate and the other end of the lower bracket are provided with negative rivet holes that pass through from top to bottom, the positive rivet passes through one end of the lower bracket, one end of the cover plate, the positive gasket and the positive rivet hole of the positive plate in sequence from bottom to top, the negative rivet passes through the other end of the lower bracket, the other end of the cover plate, the negative gasket and the negative rivet hole of the negative plate in sequence from bottom to top, and the positive rivet and the negative rivet are step-shaped structures with an upper end diameter smaller than a lower end diameter.

[0006] Furthermore, the positive electrode gasket and the negative electrode gasket are made of pps resin.

[0007] Furthermore, the upper side of the positive gasket has a groove matching the positive plate, and the positive plate is embedded in the groove on the upper side of the positive gasket. The upper side of the negative gasket has a groove matching the negative plate, and the negative plate is embedded in the groove on the upper side of the negative gasket.

[0008] Furthermore, the lower bracket is an insulating bracket.

[0009] Furthermore, an explosion-proof hole is opened in the middle of the cover plate, and an explosion-proof plate is arranged in the explosion-proof hole.

[0010] Furthermore, the upper end of the positive electrode rivet hole of the positive electrode plate is a stepped hole, and the upper end of the negative electrode rivet hole of the negative electrode plate is a stepped hole.

[0011] Furthermore, the positive electrode rivet and the negative electrode rivet include a rivet base plate, a lower rivet column and an upper rivet column, the lower rivet column and the upper rivet column are both cylindrical and the diameter of the lower rivet column is greater than the diameter of the upper rivet column, the lower end of the upper rivet column is connected to the upper end of the lower rivet column and the upper rivet column is coaxially arranged with the lower rivet column, the rivet base plate is arranged perpendicular to the lower rivet column and the upper side of the rivet base plate is fixed to the lower end of the lower rivet column.

[0012] Furthermore, a positive electrode sealing ring is arranged between the positive electrode rivet and one end of the lower bracket, and the positive electrode sealing ring is sleeved on the lower end of the rivet column at the lower end of the positive electrode rivet; a negative electrode sealing ring is arranged between the negative electrode rivet and the other end of the lower bracket, and the negative electrode sealing ring is sleeved on the lower end of the rivet column at the lower end of the negative electrode rivet.

[0013] Furthermore, a positive electrode rivet groove matching the rivet bottom plate of the positive electrode rivet is formed at one end of the lower side of the lower bracket, and a negative electrode rivet groove matching the rivet bottom plate of the negative electrode rivet is formed at the other end of the lower side of the lower bracket.

[0014] Compared with the prior art, the utility model has the following advantages and effects: the lithium battery cover plate riveting structure of the utility model adopts a stepped rivet structure with a small upper end and a large lower end. In this way, during riveting, due to the small diameter of the upper end of the rivet, its overall strength is less than the strength of the lower end of the rivet. Only the upper end of the rivet expands and deforms around, while the large diameter part of the lower end of the rivet is basically not deformed, thereby avoiding damage to the strength of the copper-aluminum friction welding connection and solving the problem of rivet separation and falling off due to reduced pulling force value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a lithium battery cover riveting structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the positive electrode rivet and the negative electrode rivet of the utility model. DETAILED DESCRIPTION

[0017] In order to elaborate on the technical scheme adopted by the utility model to achieve the predetermined technical purpose, the technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a partial embodiment of the utility model, not all of the embodiments, and the technical means or technical features in the embodiment of the utility model can be replaced without paying creative labor. The utility model will be described in detail with reference to the drawings and in combination with the embodiments.

[0018] like Figure 1 and Figure 2 As shown, a lithium battery cover plate riveting structure of the utility model comprises a positive plate 1, a negative plate 2, a positive gasket 3, a negative gasket 4, a cover plate 5, a lower bracket 6, a positive rivet 7 and a negative rivet 8. The cover plate 5 is arranged on the upper side of the lower bracket 6, the positive plate 1 and the positive gasket 3 are arranged at one end of the upper side of the cover plate 5, the negative plate 2 and the negative gasket 4 are arranged at the other end of the upper side of the cover plate 5, the positive plate 1, the positive gasket 3, one end of the cover plate 5 and one end of the lower bracket 6 are provided with positive rivet holes that pass through from top to bottom, and the negative electrode rivet holes are provided on the upper side of the cover plate 5. The plate 2, the negative electrode gasket 4, the other end of the cover plate 5 and the other end of the lower bracket 6 are provided with negative electrode rivet holes which pass through from top to bottom. The positive electrode rivet 7 passes through one end of the lower bracket 6, one end of the cover plate 5, the positive electrode gasket 3 and the positive electrode rivet hole of the positive plate 1 in sequence from bottom to top and then is fixed by riveting. The negative electrode rivet 8 passes through the other end of the lower bracket 6, the other end of the cover plate 5, the negative electrode gasket 4 and the negative electrode rivet hole of the negative plate 2 in sequence from bottom to top and then is fixed by riveting. The positive electrode rivet 7 and the negative electrode rivet 8 are step-like structures with the upper end diameter being smaller than the lower end diameter.

[0019] The positive electrode gasket 2 and the negative electrode gasket 4 are made of pps (polyphenylene sulfide) resin.

[0020] The upper side of the positive gasket 3 has a groove matching the positive plate 1, and the positive plate 1 is embedded in the groove on the upper side of the positive gasket 3. The upper side of the negative gasket 4 has a groove matching the negative plate 2, and the negative plate 2 is embedded in the groove on the upper side of the negative gasket 4.

[0021] The lower bracket 6 is an insulating bracket.

[0022] An explosion-proof hole 9 is opened in the middle of the cover plate 5, and an explosion-proof sheet is arranged in the explosion-proof hole 9. The explosion-proof sheet can be made of PET (polyethylene terephthalate) film.

[0023] The upper end of the positive electrode rivet hole of the positive electrode plate 1 is a stepped hole, and the upper end of the negative electrode rivet hole of the negative electrode plate 2 is a stepped hole.

[0024] like Figure 2As shown, the positive electrode rivet 7 and the negative electrode rivet 8 include a rivet base plate 10, a lower rivet column 11 and an upper rivet column 12. The lower rivet column 11 and the upper rivet column 12 are both cylindrical and the diameter of the lower rivet column 11 is larger than the diameter of the upper rivet column 12. The lower end of the upper rivet column 12 is connected to the upper end of the lower rivet column 11 and the upper rivet column 12 is coaxially arranged with the lower rivet column 11. The rivet base plate 10 is arranged perpendicular to the lower rivet column 11 and the upper side of the rivet base plate 10 is fixed to the lower end of the lower rivet column 11. The rivet of the utility model adopts a design of a small upper end and a large lower end. After riveting, only the upper end of the rivet is deformed, and finally a convex ring structure protruding from the side of the upper end of the rivet is formed. The convex ring structure is clamped in the step holes of the positive plate 1 and the negative plate 2 to complete the riveting.

[0025] like Figure 1 As shown, a positive electrode sealing ring 13 is provided between the positive electrode rivet 7 and one end of the lower bracket 6, and the positive electrode sealing ring 13 is sleeved on the lower end of the rivet column 11 at the lower end of the positive electrode rivet 7. A negative electrode sealing ring 14 is provided between the negative electrode rivet 8 and the other end of the lower bracket 6, and the negative electrode sealing ring 14 is sleeved on the lower end of the rivet column 11 at the lower end of the negative electrode rivet 8. The sealing performance of the lithium battery cover is ensured by the arrangement of the positive electrode sealing ring 13 and the negative electrode sealing ring 14.

[0026] A positive rivet groove matching the rivet bottom plate 10 of the positive rivet 7 is formed at one end of the lower side of the lower bracket 6, and a negative rivet groove matching the rivet bottom plate 10 of the negative rivet 8 is formed at the other end of the lower side of the lower bracket 6. After riveting, the rivet bottom plate 10 of the positive rivet 7 is embedded in the positive rivet groove on the lower side of the lower bracket 6, and the rivet bottom plate 10 of the negative rivet 8 is embedded in the negative rivet groove on the lower side of the lower bracket.

[0027] The riveting structure of the lithium battery cover of the utility model adopts a stepped rivet structure with a small upper end and a large lower end. In this way, during riveting, since the upper end diameter of the rivet is small, its overall strength is less than the strength of the lower end of the rivet. Only the upper end part of the rivet expands and deforms around, while the large diameter part of the lower end of the rivet is basically not deformed, thereby avoiding damage to the strength of the copper-aluminum friction welding connection and solving the problem of rivet separation and falling off due to reduced pulling force value.

[0028] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A lithium battery cover plate riveting structure, characterized in that: It comprises a positive plate, a negative plate, a positive gasket, a negative gasket, a cover plate, a lower bracket, a positive rivet and a negative rivet, the cover plate being arranged on the upper side of the lower bracket, the positive plate and the positive gasket being arranged at one end of the upper side of the cover plate, the negative plate and the negative gasket being arranged at the other end of the upper side of the cover plate, the positive plate, the positive gasket, one end of the cover plate and one end of the lower bracket are provided with positive rivet holes which pass through from top to bottom, the negative plate, the negative gasket, the other end of the cover plate and the other end of the lower bracket are provided with negative rivet holes which pass through from top to bottom, the positive rivet passes through one end of the lower bracket, one end of the cover plate, the positive gasket and the positive rivet hole of the positive plate in sequence from bottom to top, the negative rivet passes through the other end of the lower bracket, the other end of the cover plate, the negative gasket and the negative rivet hole of the negative plate in sequence from bottom to top, the positive rivet and the negative rivet are step-like structures with the upper end diameter being smaller than the lower end diameter.

2. A lithium battery cover plate riveting structure according to claim 1, characterized in that: The positive electrode gasket and the negative electrode gasket are made of pps resin.

3. A lithium battery cover plate riveting structure according to claim 1, characterized in that: The positive electrode gasket has a groove on its upper side that matches the positive electrode plate, and the positive electrode plate is embedded in the groove on the upper side of the positive electrode gasket. The negative electrode gasket has a groove on its upper side that matches the negative electrode plate, and the negative electrode plate is embedded in the groove on the upper side of the negative electrode gasket.

4. The lithium battery cover plate riveting structure according to claim 1, characterized in that: The lower bracket is an insulating bracket.

5. The lithium battery cover plate riveting structure according to claim 1, characterized in that: An explosion-proof hole is opened in the middle of the cover plate, and an explosion-proof sheet is arranged in the explosion-proof hole.

6. The lithium battery cover plate riveting structure according to claim 1, characterized in that: The upper end of the positive electrode rivet hole of the positive electrode plate is a stepped hole, and the upper end of the negative electrode rivet hole of the negative electrode plate is a stepped hole.

7. The lithium battery cover plate riveting structure according to claim 1, characterized in that: The positive electrode rivet and the negative electrode rivet comprise a rivet base plate, a lower rivet column and an upper rivet column, the lower rivet column and the upper rivet column are both cylindrical and the diameter of the lower rivet column is greater than the diameter of the upper rivet column, the lower end of the upper rivet column is connected to the upper end of the lower rivet column and the upper rivet column is coaxially arranged with the lower rivet column, the rivet base plate is arranged perpendicular to the lower rivet column and the upper side of the rivet base plate is fixed to the lower end of the lower rivet column.

8. A lithium battery cover plate riveting structure according to claim 7, characterized in that: A positive electrode sealing ring is arranged between the positive electrode rivet and one end of the lower bracket, and the positive electrode sealing ring is sleeved on the lower end of the rivet column at the lower end of the positive electrode rivet. A negative electrode sealing ring is arranged between the negative electrode rivet and the other end of the lower bracket, and the negative electrode sealing ring is sleeved on the lower end of the rivet column at the lower end of the negative electrode rivet.

9. A lithium battery cover plate riveting structure according to claim 7, characterized in that: A positive electrode rivet groove matching the rivet bottom plate of the positive electrode rivet is formed at one end of the lower side of the lower bracket, and a negative electrode rivet groove matching the rivet bottom plate of the negative electrode rivet is formed at the other end of the lower side of the lower bracket.

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