Secondary battery case, and secondary battery

Patent metadata

Field	Value
Publication number	US-12230816-B2
Application number	US-202016973159-A
Country	US
Kind code	B2
Filing date	Feb 27, 2020
Priority date	Mar 4, 2019
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A secondary battery case includes a recess part recessed downward, and a sealing part provided around the recess part when the secondary battery case is unfolded. At least portions of the sealing part are attached to each other to seal inner surfaces of the recess part from an outside. A secondary battery includes an electrode assembly and the secondary battery case. The recess part of the secondary battery case has a width that corresponds to a thickness of the electrode assembly.

First claim

The invention claimed is:

1. A secondary battery case configured to accommodate an electrode assembly having a structure in which electrodes and separators are alternately arranged, the secondary battery case comprising:
a recess part recessed downward; and
a sealing part provided around the recess part when the secondary battery case is unfolded, and
an inclined part adjacent to the recess part and has a surface that is inclined downward toward the outside in a direction away from the recess part when the secondary battery case is unfolded,
wherein at least portions of the sealing part are attached to each other to seal inner surfaces of the recess part from an outside, and
wherein, when the secondary battery case is unfolded, the sealing part surrounds circumferences of the recess part and the inclined part.

2. The secondary battery case of claim 1 , wherein the inclined part comprises:
a first inclined portion provided on one side of the recess part when the secondary battery case is unfolded; and
a second inclined portion provided on another side of the recess part when the secondary battery case is unfolded.

3. The secondary battery case of claim 2 , wherein, when the secondary battery case is unfolded, a sum of a height of a stepped portion between the first inclined portion and the sealing part and a height of a stepped portion between the second inclined portion and the sealing part corresponds to a width of the recess part.

4. The secondary battery case of claim 2 , wherein a bending line, which is a line along which the sealing part is bent, is disposed on the sealing part, and
the bending line comprises:
a first bending line extending outward from a point at which the first inclined portion, the recess part, and the sealing part meet each other;
a second bending line extending outward from a point at which the second inclined portion, the recess part, and the sealing part meet each other, the second bending line meeting the first bending line; and
a third bending line extending outward from a point at which the first bending line and the second bending line meet each other.

5. The secondary battery case of claim 4 , wherein the bending line further comprises a fourth bending line that extends along the first inclined portion and the second inclined portion from a point at which the first bending line, the second bending line, and the third bending line meet each other.

6. The secondary battery case of claim 5 , wherein an area of the sealing part defined outside the fourth bending line is attached to another area of the sealing part.

7. The secondary battery case of claim 2 , wherein, when the secondary battery case is unfolded, a sealing recess portion, which is recessed in a direction in which the recess part is recessed, is provided on the sealing part,
the sealing recess portion is provided in parallel to the recess part, and
a width of the sealing recess portion corresponds to a width of the recess part.

8. The secondary battery case of claim 7 , wherein the sealing recess portion comprises a first recess surface and a second recess surface which are provided adjacent to the recess part, and
the first recess surface and the second recess surface meet each other to form a V-shape,
wherein a bending line, which is a line along which the sealing part is bent, is provided on the sealing part, and
the bending line comprises:
a first bending line provided on a boundary between the first recess surface and an area of the sealing part, which is adjacent to the first inclined portion;
a second bending line provided on a boundary between the second recess surface and an area of the sealing part, which is adjacent to the second inclined portion; and
a third bending line provided on a boundary between the first recess surface and the second recess surface.

9. The secondary battery case of claim 8 , wherein the bending line further comprises a fourth bending line that extends in both directions along the first inclined portion and the second inclined portion from one point of the third bending line.

10. The secondary battery case of claim 9 , wherein an area of the sealing part defined outside the fourth bending line is attached to another area of the sealing part.

11. The secondary battery case of claim 7 , wherein the sealing recess portion comprises a first recess surface and a second recess surface which are provided adjacent to the recess part, and
the first recess surface and the second recess surface meet each other to form a V-shape,
wherein the first recess surface comprises:
a first inclined recess surface which is inclined downward from the recess part toward the second recess surface and is inclined upward toward an outside of the sealing part; and
a second inclined recess surface which extends outward from the first inclined recess surface,
wherein the second recess surface comprises:
a third inclined recess surface which is inclined downward from the recess part toward the first recess surface and is inclined upward toward the outside of the sealing part; and
a fourth inclined recess surface which extends outward from the third inclined recess surface.

12. The secondary battery case of claim 11 , wherein a bending line, which is a line along which the sealing part is bent, is provided on the sealing part, and
the bending line comprises:
a first bending line provided on a boundary between the first recess surface and an area of the sealing part adjacent to the first inclined portion;
a second bending line provided on a boundary between the second recess surface and an area of the sealing part adjacent to the second inclined portion; and
a third bending line provided on a boundary between the first recess surface and the second recess surface.

13. The secondary battery case of claim 12 , wherein the bending line further comprises a fourth bending line that extends along the first inclined portion and the second inclined portion from one point of the third bending line.

14. The secondary battery case of claim 13 , wherein an area of the sealing part defined outside the fourth bending line is attached to another area of the sealing part.

15. The secondary battery case of claim 1 , wherein, the inclined part is provided on one side of the recess part when the secondary battery case is unfolded, and
the secondary battery case further comprises a flat part which has a flat surface and is provided on another side of the recess part when the secondary battery case is unfolded.

16. The secondary battery case of claim 1 , further comprising a flat part which has a flat surface and is provided between the inclined part and the recess part when the secondary battery case is unfolded.

17. A secondary battery comprising:
the electrode assembly; and
the secondary battery case of claim 1 .

18. The secondary battery of claim 17 , wherein the recess part of the secondary battery case has a width that corresponds to a thickness of the electrode assembly.

19. The secondary battery case of claim 1 , wherein the inclined part is configured to accommodate the electrode assembly.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Kim Hyun Beom
• Park Jun Kyu
• Ha Jeong Min
• Kim Gi Man
• Ha Hyun Chul

Classifications

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M50/238

  Flexibility or foldability · CPC title

• H01M50/136

  Flexibility or foldability · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title