Riveting structure of electrode terminal, and cylindrical battery cell, battery pack and vehicle including the same

Patent metadata

Field	Value
Publication number	US-12537229-B2
Application number	US-202217592576-A
Country	US
Kind code	B2
Filing date	Feb 4, 2022
Priority date	Feb 19, 2021
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

The riveting structure of an electrode terminal for a battery includes a battery housing having a bottom; an electrode terminal riveted through a hole formed in the bottom of the battery housing; and a gasket between the electrode terminal and the battery housing. Also, the electrode terminal includes a body portion inserted into the hole; an outer flange portion extending along an outer surface of the bottom of the battery housing from a first side of the body portion exposed through the outer surface; an inner flange portion extending toward an inner surface of the bottom of the battery housing from a second side of the body portion exposed through the inner surface; and a flat portion on the second side of the body portion.

First claim

What is claimed is:

1 . A riveting structure of an electrode terminal for a battery, comprising:
a battery housing having a bottom and a side wall, the side wall being integral with the bottom and extending from a periphery of the bottom in a perpendicular direction; an electrode terminal riveted through a hole formed in the bottom of the battery housing; and a gasket between the electrode terminal and the battery housing, wherein the electrode terminal includes:
a body portion inserted into the hole;
an outer flange portion extending along an outer surface of the bottom of the battery housing from a first side of the body portion exposed through the outer surface;
an inner flange portion extending toward an inner surface of the bottom of the battery housing from a second side of the body portion exposed through the inner surface, wherein the inner flange portion has a first surface facing the inner surface of the bottom and a second surface opposite to the first surface, and a recess is formed between a side surface of the body portion and the second surface of the inner flange portion; and
a flat portion on the second side of the body portion,
wherein an exposed surface of the electrode terminal outside the battery housing is a first terminal having a first polarity and an outer surface of the bottom adjacent to the exposed surface is a second terminal having a second polarity.

2 . The riveting structure of an electrode terminal according to claim 1 , wherein the flat portion is parallel with the inner surface of the bottom of the battery housing.

3 . The riveting structure of an electrode terminal according to claim 1 , wherein an angle between the inner flange portion and the inner surface of the bottom of the battery housing is in a range of 0° to 60°.

4 . The riveting structure of an electrode terminal according to claim 1 , wherein the recess has an asymmetric cross section.

5 . The riveting structure of an electrode terminal according to claim 4 , wherein the asymmetric cross section of the recess includes a sidewall and an inclined surface of the inner flange portion connected to an end of the sidewall.

6 . The riveting structure of an electrode terminal according to claim 5 , wherein the sidewall is perpendicular to the inner surface of the bottom of the battery housing.

7 . The riveting structure of an electrode terminal according to claim 5 , wherein the sidewall is inclined toward the flat portion.

8 . The riveting structure of an electrode terminal according to claim 1 , wherein the inner flange portion has a gradually decreasing thickness in a direction extending away from the body portion.

9 . The riveting structure of an electrode terminal according to claim 1 , wherein the gasket includes:
an outer gasket between the outer flange portion and the outer surface of the bottom of the battery housing, and an inner gasket between the inner flange portion and the inner surface of the bottom of the battery housing, wherein the inner gasket has a varying thickness.

10 . The riveting structure of an electrode terminal according to claim 9 , wherein a region of the inner gasket between an inner edge of the inner surface of the bottom of the battery housing and the inner flange portion has a relatively smaller thickness than a remainder of the inner gasket.

11 . The riveting structure of an electrode terminal according to claim 9 , wherein a region of the inner gasket between the battery housing and the body portion has a gradually decreasing thickness in a direction extending from the outer flange portion.

12 . The riveting structure of an electrode terminal according to claim 9 , wherein a region of the inner gasket between the inner surface of the bottom of the battery housing and a region near an end of the inner flange portion has a smaller thickness than a remainder of the inner gasket.

13 . The riveting structure of an electrode terminal according to claim 9 , wherein the inner edge of the hole includes a facing surface that faces the inner flange portion.

14 . The riveting structure of an electrode terminal according to claim 9 , wherein the inner gasket extends outwardly further than the inner flange portion.

15 . The riveting structure of an electrode terminal according to claim 9 , wherein a height of the flat portion is equal to or larger than a height of an end of the inner gasket based on the inner surface of the bottom of the battery housing.

16 . The riveting structure of an electrode terminal according to claim 1 , wherein a height of the flat portion is equal to or larger than a height of the inner flange portion based on the inner surface of the bottom of the battery housing.

17 . The riveting structure of an electrode terminal according to claim 9 , wherein a height of the inner flange portion is larger than a height of an end of the inner gasket based on the inner surface of the bottom of the battery housing.

18 . The riveting structure of an electrode terminal according to claim 9 , wherein at least a portion of the outer gasket is exposed to the outside of the outer flange portion, and
a width of the exposed portion of the outer gasket measured in a direction parallel to the outer surface of the bottom of the battery housing is 0.1 mm to 1 mm.

19 . The riveting structure of an electrode terminal according to claim 9 , wherein a compression ratio of the inner gasket is 30% to 90%, and
wherein the compression ratio is a ratio of thickness change at a maximum compression point to a thickness before compression of the gasket.

20 . The riveting structure of an electrode terminal according to claim 19 , wherein the inner gasket includes polybutylene terephthalate, polyethylene fluoride, or polypropylene, and
wherein the compression ratio of the inner gasket is 50% to 90%.

21 . The riveting structure of an electrode terminal according to claim 1 , wherein a height of the inner flange portion is 0.5 mm to 3.0 mm based on the inner surface of the bottom of the battery housing.

22 . The riveting structure of an electrode terminal according to claim 21 , wherein a height of the electrode terminal extending from a lower surface of the outer flange portion to a surface of the flat portion is 4 mm to 7 mm.

23 . The riveting structure of an electrode terminal according to claim 1 , wherein a height of the outer flange portion is 0.8 mm or more based on the outer surface of the bottom of the battery housing.

24 . The riveting structure of an electrode terminal according to claim 1 , wherein a radius from a center of the body portion to an edge of the outer flange portion is 10% to 70% of a radius of the bottom of the battery housing.

25 . The riveting structure of an electrode terminal according to claim 1 , wherein a radius from a center of the body portion to an edge of the flat portion is 4% to 30% of a radius of the bottom of the battery housing.

26 . A battery, comprising:
an electrode assembly comprising a first electrode and a second electrode wound with a separator therebetween, wherein each of the first electrode and the second electrode has a first portion coated with an active material, and a second portion, wherein the second portion of the first electrode and the second portion of the second electrode are extended from opposite ends of the electrode assembly and exposed to the outside of the separator; a b

Assignees

• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/567

  by fixing means, e.g. screws, rivets or bolts · 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

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title