CN-121972579-A - Preparation method of cover plate assembly, cover plate assembly and battery cell

Abstract

The application provides a preparation method of a cover plate assembly, the cover plate assembly and a battery cell, wherein the method comprises the steps of providing a plate and forming a through hole on the plate; the method comprises a first step of punching a through hole on a first surface of a plate, a second step of punching a through hole on a second surface of the plate, a step of punching the through hole from the second surface to the first surface to form a cylindrical protrusion protruding out of the first surface, a step of splitting the plate, wherein the cylindrical protrusion comprises a cylindrical inner wall, a cylindrical outer wall and an annular end surface, a step of sleeving an annular first die on the outer side of the cylindrical protrusion and abutting against the first surface, the first die and the cylindrical outer wall are spaced from each other, a step of splitting the plate comprises the steps of punching a part, close to the cylindrical inner wall, of the cylindrical protrusion from the annular end surface to the second surface to form a second fixing part, and a part, close to the cylindrical outer wall, of the cylindrical protrusion moves towards the first die to avoid the second die and form the first fixing part. The preparation method of the cover plate assembly, the cover plate assembly and the battery cell provided by the application have better safety performance.

Inventors

• GAO GANG
• ZHAO GONGWEI

Assignees

• 株式会社AESC日本

Dates

Publication Date

20260505

Application Date

20251225

Priority Date

20250509

Claims (20)

1. 1. A method of making a closure assembly comprising: The method comprises the steps of providing a plate and forming a through hole on the plate, wherein the through hole penetrates through a first surface and a second surface of the plate along a first direction, and the first direction is the thickness direction of the plate; A punching step of pressing the edge of the through hole from the second surface toward the first surface to form a cylindrical projection protruding from the first surface, wherein the cylindrical projection comprises a cylindrical inner wall, a cylindrical outer wall, and annular end surfaces respectively connected with the cylindrical inner wall and the cylindrical outer wall; Sleeving an annular first die on the outer side of the cylindrical bulge and abutting against the first surface, wherein the first die and the cylindrical outer wall are mutually spaced; and (3) a splitting step, namely stamping a part, close to the cylindrical inner wall, of the cylindrical bulge from the annular end face to the second face by using a second die to form a second fixing part, and moving the part, close to the cylindrical outer wall, of the cylindrical bulge towards the first die to avoid the second die and form a first fixing part.
2. 2. The method of manufacturing a cover plate assembly according to claim 1, wherein in the splitting preparation step, a minimum linear distance between the first die and the cylindrical outer wall is L 1 along a second direction perpendicular to the first direction, a linear distance between an inner edge and an outer edge of the annular end face along the second direction is L on the same side of a center line of the cylindrical protrusion, and a ratio of L 1 to L is 0 or more and 0.06 or less.
3. 3. The method of manufacturing a cover plate assembly according to claim 1, wherein an inner wall of the first mold is inclined to a root of the cylindrical protrusion with respect to the first direction, and the inclination angle is a,0 ° < a+.10 °.
4. 4. The method for manufacturing a cover plate assembly according to claim 1, wherein an end face of the first mold is abutted against the first face, a first round corner is arranged between an inner wall of the first mold and the end face, and the radius of the first round corner is R,0<R is less than or equal to 2mm.
5. 5. The method of manufacturing a cap plate assembly according to claim 1, wherein a linear distance between an inner edge and an outer edge of the annular end surface in a second direction on the same side of a center line of the cylindrical protrusion is L, a maximum linear distance between an outer edge of a projection of the annular end surface and an outer edge of the annular end surface in the first direction in the second direction is a ratio of L 2 ,L 2 to L of 0.5 to 0.6, and the second direction is perpendicular to the first direction.
6. 6. The method of preparing a cover plate assembly of claim 1, wherein the cleaving step comprises: in the stamping process, a step part is formed at the joint of the inner wall of the first fixing part and the inner wall of the second fixing part.
7. 7. The method of preparing a cover plate assembly of claim 1, wherein the cleaving step further comprises: the position of the second face around the cylindrical projection is supported while punching a portion of the cylindrical projection near the cylindrical inner wall to form a groove in the second face.
8. 8. The method of manufacturing a closure assembly according to claim 1, wherein a second fillet is formed between the cylindrical inner wall and the second face in the punching step; After the punching step and before the splitting step, the method further comprises: a pier material preparation step, namely sleeving one part of an annular third die on the outer side of the cylindrical bulge and mutually spacing with the cylindrical outer wall to form a space for deformation of the cylindrical bulge; and upsetting, namely stamping the annular end surface towards the direction of the second surface by using the second die so as to reduce the radius of the second fillet.
9. 9. The method of preparing a cover plate assembly of claim 1, wherein the cleaving step comprises: A first torsion preventing structure is formed on an inner surface of the first fixing portion while punching a portion of the cylindrical protrusion near the cylindrical inner wall.
10. 10. The method of claim 1, wherein the first securing portion includes a first end that is distal from the sheet material, and wherein the method further comprises: The first end is pressed towards the direction of the second surface so as to form a first torsion preventing structure on the inner surface of the first fixing part.
11. 11. The method of preparing a cover plate assembly of claim 6, wherein the cleaving step comprises: An anti-twisting groove is formed on the step portion.
12. 12. The method of making a closure assembly according to claim 1, wherein the punching step comprises: And stamping the edge of the through hole from the second surface to the first surface at least twice so as to gradually increase the aperture of the through hole and form a cylindrical bulge protruding out of the first surface.
13. 13. The method of claim 1, wherein the first securing portion includes a first end distal from the sheet material, and wherein the method further comprises: and pressing the first end towards the direction of the second surface so as to bend the first end towards the center line of the first fixing part.
14. 14. The method of manufacturing a cover plate assembly according to any one of claims 1 to 13, wherein the first fixing portion and the second fixing portion define a receiving space, the method further comprising: and fixing the pole column sleeved with the sealing part in the accommodating space.
15. 15. A cover plate assembly, characterized in that it is formed by the manufacturing method of the cover plate assembly according to any one of claims 1 to 14, comprising a cover plate body and a first fixing portion configured by at least part of a plate material, and an accommodation space configured by a through hole; The first fixing part comprises a first sub part extending along the first direction, the first sub part comprises a first root part and a second root part, the first root part is arranged along the second direction, the first root part is close to the accommodating space relative to the second root part, the first root part is connected with the cover plate body in an integrated manner, the second root part is intermittently arranged with the cover plate body and is propped against the first surface, and the second direction is perpendicular to the first direction.
16. 16. The cover assembly of claim 15, wherein a minimum dimension of an end of the first sub-portion distal from the cover body in the second direction on a single side of a centerline of the receiving space is L 4 , and a sum of dimensions of the first root portion and the second root portion in the second direction is L 3 ,L 3 ＞L 4 .
17. 17. The cover plate assembly of claim 15, wherein the outer wall of the first sub-portion is disposed obliquely with respect to the first direction toward a centerline of the receiving space.
18. 18. The cover plate assembly of claim 17, wherein the first sub-portion satisfies at least one of the following conditions: the inner wall of the first sub-part is parallel to the first direction; the outer wall of the first sub-part has an inclination angle b of 0 DEG < b < 10 deg.
19. 19. The cover plate assembly of claim 16 wherein a linear separation distance between the inner and outer edges of the first root in the second direction on a single side of a centerline of the receiving space is a ratio of L 5 ,L 5 to L 3 greater than 0.65.
20. 20. The cover assembly of claim 15, wherein the cover further comprises a second securing portion comprising a second inner wall, the second inner wall satisfying at least one of: the second inner wall is perpendicular to the first direction; along the first direction, the linear spacing distance between the second inner wall and the first surface is H 1 ,1mm≤H 1 mm or less than 1.3mm.

Description

Preparation method of cover plate assembly, cover plate assembly and battery cell The present application claims priority to chinese patent application No.202510596516.5, entitled "cover plate assembly, cell and battery pack" filed in china at 2025, 05, 09, and is incorporated herein by reference in its entirety. Technical Field The application relates to the technical field of batteries, in particular to a preparation method of a cover plate assembly, the cover plate assembly and an electric core. Background In addition to improving the performance of the battery cell, the safety problem is a non-negligible problem in the development of battery technology. If the safety of the battery cell cannot be ensured, the battery cell cannot be used. Therefore, how to enhance the safety of the battery cell is a technical problem to be solved in the battery technology. Disclosure of Invention In view of the above, the present application is directed to a method for manufacturing a cover assembly, a cover assembly and a battery cell, so as to at least partially solve the problem of how to enhance the safety of the battery cell. Based on the above object, a first aspect of the present application provides a method for manufacturing a cover plate assembly, including: The method comprises the steps of providing a plate and forming a through hole on the plate, wherein the through hole penetrates through a first surface and a second surface of the plate along a first direction, and the first direction is the thickness direction of the plate; A punching step of pressing the edge of the through hole from the second surface toward the first surface to form a cylindrical projection protruding from the first surface, wherein the cylindrical projection comprises a cylindrical inner wall, a cylindrical outer wall, and annular end surfaces respectively connected with the cylindrical inner wall and the cylindrical outer wall; Sleeving an annular first die on the outer side of the cylindrical bulge and abutting against the first surface, wherein the first die and the cylindrical outer wall are mutually spaced; and (3) a splitting step, namely stamping a part, close to the cylindrical inner wall, of the cylindrical bulge from the annular end face to the second face by using a second die to form a second fixing part, and moving the part, close to the cylindrical outer wall, of the cylindrical bulge towards the first die to avoid the second die and form a first fixing part. Optionally, in the splitting preparation step, a minimum linear spacing distance between the first die and the cylindrical outer wall is L 1 along a second direction, the second direction is perpendicular to the first direction, a linear spacing distance between the inner edge and the outer edge of the annular end face along the second direction is L on the same side of the central line of the cylindrical protrusion, and a ratio of L 1 to L is greater than 0 and less than or equal to 0.06. Optionally, the inner wall of the first mold is inclined to the root of the cylindrical protrusion with respect to the first direction, and the inclination angle is a,0 ° < a+≤10 °. Optionally, the terminal surface of first mould with first face butt, the inner wall of first mould with be provided with first fillet between the terminal surface, just the radius of first fillet is R,0<R is less than or equal to 2mm. Optionally, on the same side of the center line of the cylindrical protrusion, a linear spacing distance between an inner edge and an outer edge of the annular end face along a second direction is L, a maximum linear spacing distance between a projected outer edge of the annular end face and an outer edge of the annular end face along the first direction along the second direction is a ratio of L 2,L2 to L is 0.5 to 0.6, and the second direction is perpendicular to the first direction. Optionally, the splitting step includes: in the stamping process, a step part is formed at the joint of the inner wall of the first fixing part and the inner wall of the second fixing part. Optionally, the splitting step further includes: the position of the second face around the cylindrical projection is supported while punching a portion of the cylindrical projection near the cylindrical inner wall to form a groove in the second face. Optionally, a second rounded corner is formed between the cylindrical inner wall and the second face in the punching step; After the punching step and before the splitting step, the method further comprises: a pier material preparation step, namely sleeving one part of an annular third die on the outer side of the cylindrical bulge and mutually spacing with the cylindrical outer wall to form a space for deformation of the cylindrical bulge; and upsetting, namely stamping the annular end surface towards the direction of the second surface by using the second die so as to reduce the radius of the second fillet. Optionally, the splitting step includes: A firs