CN-122000490-A - Secondary battery

Abstract

A secondary battery includes an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode, a receiving can accommodating the electrode assembly, the receiving can having one opening, and a cap assembly sealing the one opening of the receiving can, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab, wherein the cap assembly further includes a cap plate including a first terminal hole through which the first electrode terminal is exposed to the outside, and a second terminal hole through which the second electrode terminal is exposed to the outside.

Inventors

• Wen Tongshi
• JIN TAIYUAN
• LI MINGGAO

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20250829

Priority Date

20241107

Claims (20)

1. 1. A secondary battery, comprising: an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode; a receiving can accommodating the electrode assembly, the receiving can having an opening, and A cap assembly sealing the one opening of the receiving can, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab, Wherein the cap assembly further includes a cap plate including a first terminal hole through which the first electrode terminal is exposed to the outside, and a second terminal hole through which the second electrode terminal is exposed to the outside.
2. 2. The secondary battery according to claim 1, wherein: The cap assembly includes a cap insulating layer including a first through hole corresponding to the first terminal hole and a second through hole corresponding to the second terminal hole and insulating a space between the first and second electrode terminals and the cap plate, and The first electrode terminal is exposed through the first terminal hole and the first through hole, and the second electrode terminal is exposed through the second terminal hole and the second through hole.
3. 3. The secondary battery according to claim 2, wherein the first electrode terminal and the second electrode terminal are spaced apart from each other.
4. 4. The secondary battery according to claim 2, wherein the first electrode terminal comprises: a bottom portion connected to the first electrode tab, and A terminal portion protruding from the bottom portion and exposed through the first terminal hole and the first through hole, and Wherein the second electrode terminal includes: a bottom portion connected to the second electrode tab, and And a terminal portion protruding from the bottom portion of the second electrode terminal and exposed through the second terminal hole and the second through hole.
5. 5. The secondary battery according to claim 4, wherein: A recessed region having a step around the first via hole and a recessed region having a step around the second via hole are in the cap insulating layer, The bottom portion of the first electrode terminal is in contact with the recessed region around the first through hole, and The bottom portion of the second electrode terminal is in contact with the recessed region around the second via.
6. 6. The secondary battery according to claim 2, wherein the receiving can and the cap plate are electrically insulated from the first electrode and the second electrode.
7. 7. The secondary battery according to claim 2, wherein the receiving can and the cap plate comprise the same material.
8. 8. The secondary battery according to claim 7, wherein the receiving can and the cap plate comprise a polymer material.
9. 9. The secondary battery according to claim 8, wherein the receiving can and the cap plate are connected by heat fusion.
10. 10. The secondary battery according to claim 7, wherein the receiving can and the cap plate comprise a metal material.
11. 11. The secondary battery according to claim 10, wherein the receiving can and the cap plate are connected by metal bonding.
12. 12. The secondary battery according to claim 10, further comprising a first insulating member provided to surround a bottom surface and side surfaces of an inside of the receiving can.
13. 13. The secondary battery according to any one of claims 1 to 12, wherein the second electrode tab is bent and connected to the second electrode terminal.
14. 14. The secondary battery according to claim 13, further comprising a second insulating member insulating the second electrode tab, Wherein a first side of the bent portion of the second electrode tab is connected to the second electrode terminal, and Wherein a second side of the bent portion of the second electrode tab is insulated from the first electrode by the second insulating member.
15. 15. The secondary battery according to any one of claims 3 to 12, wherein the first terminal hole and the second terminal hole have shapes symmetrical to each other.
16. 16. The secondary battery according to claim 15, wherein the first terminal hole and the second terminal hole have shapes axisymmetric to each other.
17. 17. The secondary battery according to any one of claims 3 to 12, wherein the cap plate further includes a bridging portion between the first terminal hole and the second terminal hole.
18. 18. The secondary battery according to claim 17, wherein the bridge portion has a bar shape.
19. 19. The secondary battery according to any one of claims 1 to 12, wherein the first electrode terminal comprises at least one of stainless steel and nickel.
20. 20. The secondary battery according to any one of claims 1 to 12, wherein the second electrode terminal comprises aluminum.

Description

Secondary battery Technical Field The present disclosure relates to a secondary battery and a method for manufacturing the same. Background Recently, as demand for wearable devices such as headsets, in-ear headsets, smart watches, and body-attached medical devices using bluetooth increases, demand for secondary batteries having high energy density and sufficiently small size is also increasing. Such a secondary battery is manufactured in a form in which an electrode assembly is received in a circular can, the height of which is significantly smaller than the width according to the characteristics of the use environment, and may be called a coin battery or a button battery. The above information disclosed in this background section is for enhancement of understanding of the background of the present disclosure and, therefore, it may contain information that does not form a related (or prior) art. Disclosure of Invention An embodiment includes a secondary battery including an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode, a receiving can accommodating the electrode assembly, the receiving can having one opening, and a cap assembly sealing the one opening of the receiving can, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab, wherein the cap assembly further includes a cap plate including a first terminal hole through which the first electrode terminal is exposed to the outside, and a second terminal hole through which the second electrode terminal is exposed to the outside. The cap assembly may include a cap insulating layer including a first through hole corresponding to the first terminal hole and a second through hole corresponding to the second terminal hole, and may insulate spaces between the first and second electrode terminals and the cap plate, and the first electrode terminal may be exposed through the first terminal hole and the first through hole, and the second electrode terminal may be exposed through the second terminal hole and the second through hole. The first electrode terminal and the second electrode terminal may be spaced apart from each other. The first electrode terminal may include a bottom portion connected to the first electrode tab, and a terminal portion protruding from the bottom portion and exposed through the first terminal hole and the first through hole, and wherein the second electrode terminal may include a bottom portion connected to the second electrode tab, and a terminal portion protruding from the bottom portion of the second electrode terminal and exposed through the second terminal hole and the second through hole. A recessed region having a step around the first via hole and a recessed region having a step around the second via hole may be in the cap insulating layer, the bottom portion of the first electrode terminal may be in contact with the recessed region around the first via hole, and the bottom portion of the second electrode terminal may be in contact with the recessed region around the second via hole. The receiving can and the cap plate may be electrically insulated from the first electrode and the second electrode. The receiving can and the cover plate may comprise the same material. The containment tank and the cover plate may comprise a polymeric material. The receiving can and the cover plate may be connected by hot melt. The receiving can and the cover plate may include a metal material. The receiving can and the cover plate may be connected by metal bonding. The secondary battery may further include a first insulating member disposed to surround a bottom surface and side surfaces of an inside of the receiving can. The second electrode tab may be bent and connected to the second electrode terminal. The secondary battery may further include a second insulating member insulating the second electrode tab, wherein a first side of a bent portion of the second electrode tab may be connected to the second electrode terminal, and a second side of the bent portion of the second electrode tab may be insulated from the first electrode by the second insulating member. The first and second terminal holes may have shapes symmetrical to each other. The first and second terminal holes may have shapes axisymmetric to each other. The cap plate may further include a bridging portion between the first terminal hole and the second terminal hole. The bridging portion may have a bar shape. The first electrode terminal may include at least one of stainless steel and nickel. The second electrode terminal may include aluminum. The present disclosure is proposed to solve the technical problems noted herein, and embodiments of the present disclosure provide a secondar