Battery and current collector applied thereto, and battery pack and vehicle including the same

Patent metadata

Field	Value
Publication number	US-12125986-B2
Application number	US-202318131677-A
Country	US
Kind code	B2
Filing date	Apr 6, 2023
Priority date	Feb 19, 2021
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

A battery includes an electrode assembly including a first electrode, second electrode, and a separator between the first electrode and the second electrode, the first electrode including a first region coated with an active material and a second region at a first side and adjacent to the first region, the second region being exposed beyond the separator, and at least part of the second region is an electrode tab; a housing including a first end with a first opening, the housing accommodating the electrode assembly; a first current collector including an edge portion on the electrode assembly, a second region coupling portion extending from the edge portion and coupled with the second region, and a terminal coupling portion spaced apart from the second region coupling portion; and a terminal coupled with the terminal coupling portion.

First claim

What is claimed is:

1. A battery, comprising:
an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode, the first electrode, the second electrode, and the separator wound about an axis to define a core and an outer circumferential surface,
wherein the first electrode includes a first region coated with an active material and a second region at a first side and adjacent to the first region, the second region being exposed beyond the separator, and
at least part of the second region is an electrode tab;
a housing including a first end with a first opening, the housing accommodating the electrode assembly;
a first current collector including an edge portion on the electrode assembly, a second region coupling portion extending inward from the edge portion to end in a free end and coupled with the second region, and a terminal coupling portion spaced apart from the free end of the second region coupling portion so as to not be in direct contact with the free end of the second region coupling portion; and
a terminal coupled with the terminal coupling portion.

2. The battery according to claim 1 , wherein the edge portion has a rim shape having an inner space with an opening.

3. The battery according to claim 1 , wherein the second region coupling portion and the terminal coupling portion are only electrically connected by the edge portion.

4. The battery according to claim 2 , wherein the terminal coupling portion is at a center of the inner space of the edge portion.

5. The battery according to claim 1 , wherein the first current collector further includes a connecting portion extending inward from the edge portion and connected to the terminal coupling portion.

6. The battery according to claim 5 , comprising a plurality of the second region coupling portions.

7. The battery according to claim 6 , wherein the terminal coupling portion is surrounded by the plurality of second region coupling portions.

8. The battery according to claim 6 , comprising a plurality of the connecting portions.

9. The battery according to claim 5 , wherein the connecting portion includes a current interruption portion having a smaller cross-sectional area than a remaining region of the connection portion.

10. The battery according to claim 9 , wherein the current interruption portion includes a region having a smaller width or thickness than the remaining region of the connecting portion.

11. The battery according to claim 9 , wherein the current interruption portion includes a notch, a groove, or a through-hole formed on at least one surface of the connecting portion.

12. The battery according to claim 1 , wherein the terminal coupling portion is at a location corresponding to a hole formed at a winding center of the electrode assembly.

13. The battery according to claim 1 , further comprising:
an insulator between a second end of the housing opposite the first opening and the first current collector.

14. The battery according to claim 13 , wherein the insulator has a thickness corresponding to a distance between an inner surface of the second end of the housing and the first current collector.

15. The battery according to claim 14 , wherein the terminal is coupled with the terminal coupling portion of the first current collector through a hole formed in the insulator.

16. The battery according to claim 15 , wherein a lower end of the terminal coupled with the terminal coupling portion is at a height that is substantially equal to or higher than a lower surface of the insulator.

17. The battery according to claim 1 , wherein the second electrode further includes a third region coated with an active material and a fourth region at a second side and opposite to the third region,
wherein the fourth region extends in a direction opposite to the second region and is exposed beyond the separator,
wherein the battery further comprises a second current collector coupled to the fourth region and the housing to electrically connect the fourth region to the housing, the second current collector including:
a fourth region coupling portion coupled with the fourth region; and
a housing coupling portion coupled with the housing,
wherein a distance from a center of the first current collector to an outermost side of the edge portion is longer than a distance from a center of the second current collector to an outermost side of the fourth region coupling portion.

18. The battery according to claim 1 , wherein at least part of the second region includes a plurality of segments along a winding direction of the electrode assembly, and
wherein the plurality of segments is bent along a radial direction of the electrode assembly,
wherein the plurality of segments overlaps in multiple layers,
wherein the electrode assembly has a welding target area including a uniform number of overlaps of the plurality of segments of the second region along the radial direction of the electrode assembly.

19. The battery according to claim 5 , wherein the first current collector further includes a bridge portion connected according to at least one of the following: between adjacent second region coupling portions; between the second region coupling portion and the connecting portion adjacent to each other; and between adjacent connecting portions.

20. The battery according to claim 19 , wherein the bridge portion is at an inner position relative to the edge portion.

21. The battery according to claim 20 , wherein the first current collector has an impregnation hole between the edge portion and the bridge portion.

22. The battery according to claim 9 , wherein the first current collector includes an additional connecting portion.

23. The battery according to claim 18 , wherein the welding target area includes a maximum number of overlapping layers of the plurality of segments.

24. The battery according to claim 18 , wherein the first current collector is welded to the second region in the welding target area.

25. The battery according to claim 9 , wherein at least part of the second region includes a plurality of segments split along a winding direction of the electrode assembly, and the plurality of segments is bent along a radial direction of the electrode assembly and overlaps in multiple layers, and
wherein the current interruption portion is in an area corresponding to a welding target area having a uniform number of overlaps of the plurality of segments along the radial direction of the electrode assembly.

26. The battery according to claim 9 , wherein a tape is coupled to the current interruption portion.

27. The battery according to claim 26 , wherein the tape surrounds the connecting portion at an area where the current interruption portion is formed.

28. The battery according to claim 18 , wherein the following formula is satisfied:
JR− 2* F≤T<JR,
wherein an outer diameter of the first current collector is T,
wherein an outer diameter of the electrode assembly is JR, and
wherein a height of one of the plurality of segments disposed on an outermost side in the radial direction of the electrode assembly is F.

29. The battery according to claim 10 , comprising a plurality of the current interruption portions being provided along a lengthwise direction of the connecting portion.

Assignees

• Lg Energy Solution Ltd

Inventors

• Choi Su-Ji
• Hwangbo Kwang-Su
• Kim Do-Gyun
• Min Geon-Woo
• Jo Min-Ki
• Lim Jae-Won
• Kim Hak-Kyun
• Lee Je-Jun
• Jung Ji-Min
• Lim Hae-Jin
• Kim Jae-Woong
• Park Jong-Sik
• Choe Yu-Sung
• Lee Byoung-Gu
• Ryu Duk-Hyun
• Lee Kwan-Hee
• Lee Jae-Eun
• Kang Bo-Hyun
• Kong Jin-Hak
• Lee Soon-O
• Choi Kyu-Hyun
• Park Pil-Kyu

Classifications

• H01M50/188

  the sealing members being arranged between the lid and terminal · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/179

  for cells having curved cross-section, e.g. round or elliptic (H01M50/176, H01M50/181 take precedence) · CPC title

• H01M50/509

  characterised by the type of connection, e.g. mixed connections · CPC title

• H01M50/559

  Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells (H01M50/553 takes precedence) · CPC title