CN-122026020-A - Button cell

Abstract

The application provides a button cell. The button cell includes a housing and a laminated cell. The shell comprises a bottom shell, a pole column and a top cover which are connected. The lamination cell is arranged in the shell. Along the stacking direction of the laminated battery cell, the laminated battery cell comprises a first single-sided pole piece and a second single-sided pole piece which are opposite in polarity and located at the outermost side. The first single-sided pole piece comprises a first current collector and a first active material layer. The surface of the first current collector facing the pole is directly and electrically connected with the pole. The second single-sided pole piece comprises a second current collector and a second active material layer. The surface of the second current collector facing away from the pole is directly and electrically connected with the bottom shell. The first adhesive member adheres the first current collector and the pole. The pole comprises a first wall surface and a first concave part, the first wall surface is arranged facing the lamination cell, the first concave part is arranged on the first wall surface, the first concave part comprises an opening positioned on the first wall surface, a first bonding piece is arranged in the first concave part, and the first wall surface is abutted against the surface of the first current collector facing the pole.

Inventors

• MA WU
• WANG ZHONGYI

Assignees

• 宁德新能源科技有限公司

Dates

Publication Date

20260512

Application Date

20250114

Claims (20)

1. 1. A button cell, comprising: The shell comprises a bottom shell, a pole column and a top cover, wherein the top cover is in sealing connection with the bottom shell, the pole column is connected with the top cover, and different polarities are led out from the bottom shell and the pole column; The laminated battery cell is arranged in the shell, along the stacking direction of the laminated battery cell, the laminated battery cell comprises a first single-sided pole piece and a second single-sided pole piece which are positioned at the outermost side, the polarities of the first single-sided pole piece and the second single-sided pole piece are opposite, the first single-sided pole piece comprises a first current collector and a first active material layer, along the stacking direction of the laminated battery cell, the surface of the first current collector facing the pole is directly and electrically connected with the pole, the first active material layer is arranged on the surface of the first current collector facing away from the pole, the second single-sided pole piece comprises a second current collector and a second active material layer, the surface of the second current collector facing away from the pole is directly and electrically connected with the bottom shell, and the second active material layer is arranged on the surface of the second current collector facing the pole; a first adhesive member that adheres the first current collector and the post; the pole comprises a first wall surface and a first concave portion, the first wall surface faces the laminated battery cell, the first concave portion is arranged on the first wall surface, the first concave portion comprises an opening located on the first wall surface, the first bonding piece is arranged in the first concave portion, and the first wall surface abuts against the surface of the first current collector facing the pole.
2. 2. The button cell of claim 1, wherein the first adhesive is a conductive adhesive, and/or a pressure sensitive adhesive.
3. 3. The coin cell of claim 1 wherein the first current collector comprises a first tab and a first body portion connected, the first tab and the first body portion being integrally formed, the first active material layer being disposed on the first body portion, the surface of the first body portion facing the post being in direct electrical connection with the post.
4. 4. The button cell of claim 3, wherein the first adhesive bonds the post and the first body portion.
5. 5. The button cell of claim 1, wherein the first current collector comprises a first tab, a first body portion, and a first turnover portion connected to each other, the first tab, the first body portion, and the first turnover portion are integrally formed, the first active material layer is disposed on the first body portion, the first turnover portion is turned over with respect to the first body portion, the first turnover portion is disposed between the first body portion and the pole, and a surface of the first turnover portion facing the pole is directly electrically connected to the pole.
6. 6. The button cell of claim 5, wherein the first adhesive bonds the first fold and the post.
7. 7. The button cell of claim 5, wherein the first fold is greater than or equal to the area of the first body portion.
8. 8. The button cell of claim 3 or 7, wherein the surface area of the post facing the laminated cell is greater than or equal to the area of the first body portion.
9. 9. The button cell of any one of claims 1-7 wherein the bottom case has a bottom wall, the button cell comprising a second adhesive that adheres the second current collector to the bottom wall.
10. 10. The button cell of claim 9, wherein the bottom wall has a second wall surface, the bottom case includes a second protrusion, the second wall surface is disposed facing the laminated cell, the second protrusion is disposed on the second wall surface in a protruding manner, the second protrusion abuts against a surface of the second current collector facing the bottom wall, and a second distance is provided between the second wall surface and the second current collector along a stacking direction of the laminated cell.
11. 11. The button cell of claim 10, wherein the second pitch has a value in the range of greater than 0 microns and less than or equal to 50 microns.
12. 12. The button cell of claim 10 wherein the second adhesive member is disposed between the bottom wall and the second current collector, the second adhesive member having a second relief passage, the second tab passing through the second relief passage and abutting the second current collector.
13. 13. The button cell of claim 9, wherein the bottom wall has a second wall surface and a second recess, the second wall surface facing the laminated cell, the second recess including an opening in the second wall surface, the second recess having the second adhesive disposed therein, the second wall surface abutting against a surface of the second current collector facing the bottom wall, the second adhesive bonding the second current collector and the post.
14. 14. The button cell of claim 13, wherein the second adhesive is a conductive adhesive or a pressure sensitive adhesive.
15. 15. The coin cell of any one of claims 1 to 7 wherein the second current collector includes a second tab and a second body portion connected, the second tab and the second body portion being integrally formed, the second active material layer being disposed on the second body portion, a surface of the second body portion facing away from the post being directly electrically connected to the bottom case.
16. 16. The button cell of claim 15, wherein the bottom case has a bottom wall, the button cell comprising a second adhesive that adheres the second body portion and the bottom wall.
17. 17. The button cell of any one of claims 1-7, wherein the second current collector comprises a second tab, a second body portion, and a second fold-over portion connected, the second tab, the second body portion, and the second fold-over portion being integrally formed, the second active material layer being disposed in the second body portion, the second fold-over portion being folded over relative to the second body portion, the second fold-over portion being located between the second body portion and the bottom case, a surface of the second fold-over portion facing away from the post being directly electrically connected to the bottom case.
18. 18. The button cell defined in claim 17, wherein the bottom case has a bottom wall, the second fold is welded to the bottom wall, or the button cell comprises a second adhesive that adheres the second fold to the bottom wall.
19. 19. The button cell of claim 17, wherein the second hinge has an area greater than or equal to an area of the second body portion.
20. 20. The button cell of any one of claims 1-7, wherein the laminated cell comprises a first double-sided pole piece and a second double-sided pole piece, the first double-sided pole piece and the second double-sided pole piece being alternately laminated therebetween, the first single-sided pole piece and the first double-sided pole piece being identical in polarity, the first single-sided pole piece and each of the first double-sided pole pieces being electrically connected, the second single-sided pole piece and the second double-sided pole piece being identical in polarity, the second single-sided pole piece and each of the second double-sided pole pieces being electrically connected.

Description

Button cell The present application is a divisional application, the application number of which is 202510056264.7, the application date of which is 2025, 01 and 14, the entire contents of which are incorporated herein by reference. Technical Field The application relates to the field of batteries, in particular to a button battery. Background Button cells are widely used in electronic devices such as computers, clocks, calculators, and the like. In the development of button cell technology, how to improve the energy density of button cells is one of the research directions in battery technology. Disclosure of Invention In view of the above, the present application provides a button cell, which can advantageously improve the energy density of the button cell. The application provides a button cell, which comprises a shell and a lamination cell. The shell comprises a bottom shell, a pole and a top cover. The top cover is connected with the bottom shell in a sealing way. The pole is connected with the top cover. The bottom shell and the polar post are led out of different polarities. The lamination cell is arranged in the shell. Along the stacking direction of the laminated battery cell, the laminated battery cell comprises a first single-sided pole piece and a second single-sided pole piece which are positioned at the outermost side. The polarity of the first single-sided pole piece is opposite to that of the second single-sided pole piece. The first single-sided pole piece comprises a first current collector and a first active material layer. Along the stacking direction of the laminated battery cells, the surface of the first current collector facing the pole is directly and electrically connected with the pole. The first active material layer is arranged on the surface of the first current collector, which is opposite to the polar post. The second single-sided pole piece comprises a second current collector and a second active material layer. The surface of the second current collector facing away from the pole is directly and electrically connected with the bottom shell. The second active material layer is arranged on the surface of the second current collector facing the polar column. The first adhesive member adheres the first current collector and the pole. The pole comprises a first wall surface and a first concave part, the first wall surface is arranged facing the lamination cell, the first concave part is arranged on the first wall surface, the first concave part comprises an opening positioned on the first wall surface, a first bonding piece is arranged in the first concave part, and the first wall surface is abutted against the surface of the first current collector facing the pole. The button cell of the embodiment of the application comprises a shell and a lamination cell arranged in the shell. The first single-sided pole piece and the second single-sided pole piece at the outermost side in the laminated battery cell are respectively and directly electrically connected with the pole post and the bottom shell, so that the laminated battery cell and the shell do not need to be additionally switched by using a switching piece. In the stacking direction of the lamination electric core, a space for avoiding the switching piece is not required to be reserved between the lamination electric core and the shell, so that the structural compactness of the button cell can be improved in the stacking direction of the lamination electric core. The above structural design can be favorable for reducing the overall size of the button cell in the stacking direction of the laminated battery cells so as to reduce the overall volume of the button cell, thereby being favorable for improving the energy density of the button cell. The position of the lamination cell in the shell can be fixed through the first bonding piece, and the possibility that the lamination cell shakes in the shell to lead the pole and the first current collector to be separated from an electric connection state is reduced. The first wall surface of the pole is in direct contact with the surface of the first current collector facing the pole. The first wall surface is spaced from the first current collector by zero. The above structural design is favorable for reducing the overall size of the button cell in the stacking direction of the laminated battery cells so as to reduce the overall volume of the button cell, thereby being favorable for improving the energy density of the button cell. In one or more of the above alternative embodiments, the first adhesive member is a conductive adhesive, and/or a pressure sensitive adhesive. The first adhesive member may be a conductive adhesive. The first adhesive itself has electrical conductivity so that the pole and the first current collector can also be electrically connected by the first adhesive. The first adhesive member may be a pressure sensitive adhesive. The first bonding piece can be bonded w