Lithium secondary battery

Patent metadata

Field	Value
Publication number	US-2021344068-A1
Application number	US-202117378330-A
Country	US
Kind code	A1
Filing date	Jul 16, 2021
Priority date	Oct 7, 2015
Publication date	Nov 4, 2021
Grant date	—

Abstract

The present invention provides a lithium secondary battery which includes an electrode assembly to which an electrode tap is attached, an electrode tap receptor configured to house a portion of the electrode assembly such that a portion of the electrode tap protrudes to an outside, and a case configured to surround the electrode assembly and seal the electrode assembly together with the electrode tap receptor, wherein the electrode tap receptor includes a gas barrier layer.

First claim

What is claimed is:

1 . A lithium secondary battery comprising:
an electrode assembly to which an electrode tap is attached; an electrode tap receptor configured to house a portion of the electrode assembly; wherein the electrode tap receptor comprises a hole through which a portion of the electrode tap protrudes to an outside; and a case formed from one sheet configured to surround the electrode assembly, wherein an end of the electrode tap receptor and an end of the case partially overlap each other, and the end of the case is disposed over the end of the electrode tap receptor to seal the electrode assembly, wherein the case surrounds sides of the electrode assembly to which the electrode tap is not attached, wherein the electrode tap receptor includes a gas barrier layer, and wherein an inner surface of the electrode tap receptor includes an electrolyte storage part which has a shape of a groove.

2 . The lithium secondary battery according to claim 1 , wherein the electrode tap receptor is formed in a plurality of layers, and the gas barrier layer is included in an inner layer of the electrode tap receptor.

3 . The lithium secondary battery according to claim 1 , wherein the gas barrier layer is formed on a portion which contacts the electrode assembly.

4 . The lithium secondary battery according to claim 1 , wherein the gas barrier layer includes at least one selected from a group consisting of ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyvinyl alcohol, nylon, polyamide, polyacrylonitrile, linear low-density polyethylene and ionomer copolymer.

5 . The lithium secondary battery according to claim 1 , wherein the gas barrier layer includes a metal film, a coating layer made of at least one selected from a group consisting of silica, alumina, rubber, metal, glass and amorphous carbon, or a film having a coating layer in which layered silicate nano particles are dispersed in a polyvinyl alcohol binder.

6 . The lithium secondary battery according to claim 1 , further comprising: a sub receptor provided on an opposite surface of the electrode assembly relative to one surface to which the electrode tap is attached to house a portion the electrode assembly including the opposite surface,
wherein the sub receptor includes a gas barrier layer.

7 . The lithium secondary battery according to claim 1 , wherein the electrode tap includes a first electrode tap and a second electrode tap which are attached to surfaces of the electrode assembly facing each other, and
wherein the electrode tap receptor includes a first electrode tap receptor configured to house a portion of the electrode assembly, and a second electrode tap receptor configured to house a portion of the electrode assembly, wherein the first electrode tap receptor comprises a hole through which a portion of the first electrode tap protrudes to the outside, and the second electrode tap receptor comprises a hole through which a portion of the second electrode tap protrudes to the outside.

8 . The lithium secondary battery according to claim 1 , wherein a portion in which the case and the electrode tap receptor contact each other is sealed by an adhesive or thermal fusion bonding.

9 . The lithium secondary battery according to claim 1 , wherein the case is formed of at least one selected from a group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyethylene naphthalate.

Assignees

• Sk Innovation Co Ltd

Inventors

• Kang Hee-Gyoung

Classifications

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M50/183

  Sealing members · CPC title

• H01M50/179

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

• H01M50/176

  for prismatic or rectangular cells (H01M50/181 takes precedence) · CPC title

• H01M50/538

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