CN-122026017-A - Secondary battery and method of manufacturing the same

Abstract

The present disclosure relates to a secondary battery and a method of manufacturing the same. The secondary battery includes an electrode assembly including an electrode stack formed by alternately stacking first electrodes, separators, and second electrodes each having a circular shape, a first electrode tab connected to the first electrodes, and a second electrode tab connected to the second electrodes, a receiving can having one open side for receiving the electrode assembly, the receiving can being electrically connected to the first electrode tab, a cap assembly configured to seal the one open side of the receiving can, the cap assembly being electrically connected to the second electrode tab, a first contact member between one surface of the electrode stack and the first electrode tab, the one surface of the electrode stack facing a bottom surface of the receiving can, and a first fixing member surrounding the first electrode tab between an inner sidewall of the receiving can and an outer peripheral surface of the electrode assembly.

Inventors

• ZHANG TAIXIONG

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260512

Application Date

20250925

Priority Date

20241111

Claims (20)

1. 1. A secondary battery, comprising: an electrode assembly including an electrode stack formed by alternately stacking first electrodes, separators, and second electrodes each having a circular shape, a first electrode tab connected to the first electrodes, and a second electrode tab connected to the second electrodes; a receiving can having one open side for receiving the electrode assembly, the receiving can being electrically connected to the first electrode tab; A cap assembly configured to seal the one open side of the receiving can, the cap assembly being electrically connected to the second electrode tab; A first contact member between one surface of the electrode stack and the first electrode tab, the one surface of the electrode stack facing a bottom surface of the accommodating can, and A first fixing member surrounding the first electrode tab between an inner sidewall of the receiving can and an outer circumferential surface of the electrode assembly.
2. 2. The secondary battery according to claim 1, wherein the first fixing member comprises: A first surface contacting the first electrode tab, and A second surface contacting the containment tank, Wherein the width of the first surface is greater than the width of the second surface along the circumference of the electrode assembly.
3. 3. The secondary battery according to claim 2, wherein a cross section of the first fixing member perpendicular to a stacking direction of the electrode stack has an arc shape.
4. 4. The secondary battery according to claim 2, wherein a cross section of the first fixing member perpendicular to a stacking direction of the electrode stack has a trapezoidal shape.
5. 5. The secondary battery according to claim 2, wherein a cross section of the first fixing member perpendicular to a stacking direction of the electrode stack has a stepped shape between the first surface and the second surface.
6. 6. The secondary battery according to claim 2, wherein the first fixing member is coupled to the first electrode tab by an adhesive coated on the first surface.
7. 7. The secondary battery according to claim 1, further comprising a second fixing member surrounding the second electrode tab between the inner sidewall of the receiving can and the outer circumferential surface of the electrode assembly.
8. 8. The secondary battery according to claim 7, wherein the second fixing member comprises: a first surface contacting the second electrode tab, and A second surface contacting the containment tank, Wherein the width of the first surface is greater than the width of the second surface along the circumference of the electrode assembly.
9. 9. The secondary battery according to claim 8, wherein a cross section of the second fixing member perpendicular to a stacking direction of the electrode stack has an arc shape.
10. 10. The secondary battery according to claim 8, wherein a cross section of the second fixing member perpendicular to a stacking direction of the electrode stack has a trapezoidal shape.
11. 11. The secondary battery according to claim 8, wherein a cross section of the second fixing member perpendicular to a stacking direction of the electrode stack has a stepped shape between the first surface and the second surface.
12. 12. The secondary battery according to claim 7, wherein at least one of the first fixing member and the second fixing member comprises an insulating material comprising at least one of polypropylene, polyimide, and polyethylene terephthalate.
13. 13. The secondary battery according to claim 7, wherein at least one of the first fixing member and the second fixing member includes a porous insulating material.
14. 14. The secondary battery according to any one of claims 1 to 13, wherein the first electrode includes a first coating portion on an inner side of a predetermined first chord on an outer periphery of a circular first substrate, the first coating portion being coated with a first active material, and a first uncoated portion on an outer side of the predetermined first chord, the first uncoated portion being uncoated with the first active material, and Wherein the second electrode includes a second coating portion on an inner side of a predetermined second chord on an outer circumference of the circular second substrate, the second coating portion being coated with a second active material, and a second uncoated portion on an outer side of the predetermined second chord, which is not coated with the second active material.
15. 15. The secondary battery according to any one of claims 1 to 13, wherein the first electrode tab is attached to the bottom surface of the accommodating can by pressure from the electrode stack in response to the cap assembly being coupled to the accommodating can.
16. 16. The secondary battery according to any one of claims 1 to 13, further comprising a second contact member between another surface of the electrode stack facing the second electrode tab and a bottom surface of the cap assembly.
17. 17. The secondary battery according to claim 16, wherein the second electrode tab is attached to the bottom surface of the cap assembly by pressure from the electrode stack in response to the cap assembly being coupled to the receiving can.
18. 18. The secondary battery according to any one of claims 1 to 13, wherein the cap assembly includes: a terminal plate connected to the second electrode tab; a cover plate including a first opening, the cover plate coupled to the one open side of the containment tank, and And a cover insulating layer including a second opening, the cover insulating layer being between the terminal plate and the cap plate for insulation.
19. 19. The secondary battery according to claim 18, wherein the terminal plate comprises: a main body connected to the second electrode tab, and And a protrusion protruding upward from a center of the main body, the protrusion passing through the first opening and the second opening, wherein a diameter of the main body is larger than a diameter of an outer circumferential surface of the electrode stack.
20. 20. A method of manufacturing a secondary battery, the method comprising: Forming an electrode assembly including an electrode stack formed by alternately stacking first electrodes, separators, and second electrodes each having a circular shape, a first electrode tab connected to the first electrodes, and a second electrode tab connected to the second electrodes; disposing a first contact member on the electrode stack, and bending and placing the first electrode tab on the first contact member; Disposing a first fixing member on an outer circumferential surface of the electrode assembly to surround the first electrode tab; the electrode assembly is accommodated in an accommodating can having one open side, and The first electrode tab is connected to the receiving can by coupling the cap assembly to the one open side of the receiving can.

Description

Secondary battery and method of manufacturing the same Technical Field The present disclosure relates to a secondary battery and a method of manufacturing the same. Background Recently, the growing demand for wearable devices such as bluetooth-enabled headsets, in-ear headsets, smart watches, and wearable medical devices has increased the demand for ultra-small secondary batteries having high energy density and sufficiently small size. Depending on the nature of the application, the height of such secondary batteries is significantly smaller than the width, and may be referred to as coin cells and button cells. The secondary battery includes an electrode assembly including a positive electrode and a negative electrode, a receiving can for receiving the electrode assembly, an electrode terminal connected to the electrode assembly, and the like. The electrode assembly has a winding type or a stacking type to be received in the receiving can. 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 an electrode stack formed by alternately stacking first electrodes, separators, and second electrodes each having a circular shape, a first electrode tab connected to the first electrodes, and a second electrode tab connected to the second electrodes, a receiving can having one open side for receiving the electrode assembly, the receiving can being electrically connected to the first electrode tab, a cap assembly configured to seal the one open side of the receiving can, the cap assembly being electrically connected to the second electrode tab, a first contact member between one surface of the electrode stack and the first electrode tab, the one surface of the electrode stack facing a bottom surface of the receiving can, and a first fixing member surrounding the first electrode tab between an inner sidewall of the receiving can and an outer circumferential surface of the electrode assembly. The first fixing member may include a first surface contacting the first electrode tab, and a second surface contacting the receiving can, wherein a width of the first surface may be greater than a width of the second surface along a circumference of the electrode assembly. A cross section of the first fixing member perpendicular to the stacking direction of the electrode stack may have an arc shape. A cross section of the first fixing member perpendicular to the stacking direction of the electrode stack may have a trapezoidal shape. A cross section of the first fixing member perpendicular to the stacking direction of the electrode stack may have a stepped shape between the first surface and the second surface. The first fixing member may be coupled to the first electrode tab by an adhesive coated on the first surface. The secondary battery may further include a second fixing member surrounding the second electrode tab between the inner sidewall of the receiving can and the outer circumferential surface of the electrode assembly. The second fixing member may include a first surface contacting the second electrode tab, and a second surface contacting the receiving can, wherein a width of the first surface may be greater than a width of the second surface along a circumference of the electrode assembly. A cross section of the second fixing member perpendicular to the stacking direction of the electrode stack may have an arc shape. A cross section of the second fixing member perpendicular to the stacking direction of the electrode stack may have a trapezoidal shape. A cross section of the second fixing member perpendicular to the stacking direction of the electrode stack may have a stepped shape between the first surface and the second surface. At least one of the first fixing member and the second fixing member may include an insulating material including at least one of polypropylene, polyimide, and polyethylene terephthalate. At least one of the first fixing member and the second fixing member may include a porous insulating material. The first electrode may include a first coating portion on an inner side of a predetermined first chord on an outer circumference of a circular first substrate, the first coating portion being coated with a first active material, and a first uncoated portion on an outer side of the predetermined first chord, which is not coated with the first active material, and wherein the second electrode includes a second coating portion on an inner side of a predetermined second chord on an outer circumference of a circular second substrate, the second coating portion being coated with a second active material, and a second uncoated portion on an outer side of the predetermined second chord, which is not coated with the second active mat