Current collector, battery cell, battery pack, and vehicle including the same

Patent metadata

Field	Value
Publication number	US-12597683-B2
Application number	US-202418741471-A
Country	US
Kind code	B2
Filing date	Jun 12, 2024
Priority date	Jun 16, 2023
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

A battery cell includes: an electrode assembly including a first electrode and a second electrode with a separator interposed therebetween, and the first electrode, second electrode and separator are wound around a winding axis, wherein the first electrode includes a first uncoated portion, which is not coated with an active material layer; a battery housing having an opening and that accommodates the electrode assembly through the opening; and a current collector including a support portion, a tab coupling portion, and a housing coupling portion. A fracture portion is provided at a boundary between the support portion and the tab coupling portion.

First claim

What is claimed is:

1 . A battery cell comprising:
an electrode assembly including a first electrode and a second electrode with a separator interposed therebetween, and the first electrode, second electrode and separator being wound around a winding axis in a winding direction to define a core and an outer peripheral surface, wherein the first electrode includes a first uncoated portion, which is not coated with an active material layer, along the winding direction; a battery housing having an opening at one side thereof and configured to accommodate the electrode assembly through the opening; and a current collector including a support portion disposed directly on the electrode assembly, a tab coupling portion extending from the support portion and directly coupled to the first uncoated portion, and a housing coupling portion extending from the support portion and electrically coupled to an inner surface of the battery housing, wherein a fracture portion configured to have lower strength than a surrounding region is provided at a boundary between the support portion and the tab coupling portion, and wherein the fracture portion is configured to be fractured to allow the tab coupling portion to be separated from the support portion.

2 . The battery cell according to claim 1 , wherein the fracture portion includes a notch line including a plurality of notches.

3 . The battery cell according to claim 2 , wherein the current collector includes a through hole that passes through the current collector.

4 . The battery cell according to claim 3 , wherein the through hole is located on the notch line.

5 . The battery cell according to claim 3 , wherein the through hole is located at a center of the boundary between the support portion and the tab coupling portion.

6 . The battery cell according to claim 3 , wherein at least one through hole is provided on the support portion.

7 . The battery cell according to claim 3 , wherein at least one through hole is provided on the tab coupling portion.

8 . The battery cell according to claim 2 , wherein the notch line has a curved shape.

9 . The battery cell according to claim 1 , wherein the tab coupling portion has a larger width than the housing coupling portion.

10 . The battery cell according to claim 2 , wherein the first uncoated portion and the tab coupling portion are coupled by welding along a radial direction of the electrode assembly.

11 . The battery cell according to claim 10 , wherein a weld bead is formed between the first uncoated portion and the tab coupling portion, and
wherein the weld bead forms a linear welding pattern extending along the radial direction of the electrode assembly.

12 . The battery cell according to claim 11 , wherein the welding pattern is configured to be perpendicular to the notch line.

13 . A battery pack comprising at least one battery cell of claim 1 .

14 . A vehicle comprising at least one battery pack of claim 13 .

15 . A battery module comprising at least one battery cell of claim 1 .

16 . An energy storage system comprising at least one battery module of claim 15 .

17 . The battery cell according to claim 1 , wherein the battery housing is a cylindrical housing.

18 . A current collector comprising:
a support portion disposed directly on an electrode assembly; a tab coupling portion extending from the support portion and directly coupled to a first uncoated portion; and a housing coupling portion extending from the support portion and electrically coupled to an inner surface of a battery housing, wherein a fracture portion configured to have lower strength than a surrounding region is provided at a boundary between the support portion and the tab coupling portion, and wherein the fracture portion is configured to be fractured to allow the tab coupling portion to be separated from the support portion.

Assignees

• Lg Energy Solution Ltd

Inventors

• Park Sang-Jin
• Kim Hong-Jae
• Park Jong-Hoon
• Woo Jae-Young
• Lee Jun-Su

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/536

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

• Y02P70/50

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

• H01M50/538

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title

• H01M50/107

  having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) · CPC title