Pouch-type secondary battery for preventing water permeation

Patent metadata

Field	Value
Publication number	US-2016028051-A1
Application number	US-201414432037-A
Country	US
Kind code	A1
Filing date	Oct 31, 2014
Priority date	Nov 1, 2013
Publication date	Jan 28, 2016
Grant date	—

Abstract

Disclosed is a pouch-type secondary battery. The pouch-type secondary battery according to the present disclosure includes an electrode assembly comprising a cathode plate and an anode plate and a separator interposed between the cathode plate and the anode plate; and a pouch-type case formed by receiving and packaging the electrode assembly and an electrolyte solution inside, the pouch-type case having a sealing part formed along a circumference thereof, wherein a water permeation prevention member is attached to the entire sealing part formed along the circumference of the pouch-type case by welding.

First claim

What is claimed is:

1 . A pouch-type secondary battery comprising:
an electrode assembly comprising a cathode plate and an anode plate and a separator interposed between the cathode plate and the anode plate; and a pouch-type case formed by receiving and packaging the electrode assembly and an electrolyte solution inside, the pouch-type case having a sealing part formed along a circumference thereof, wherein a water permeation prevention member is attached to the entire sealing part formed along the circumference of the pouch-type case by welding.

2 . The pouch-type secondary battery according to claim 1 , wherein the water permeation prevention member is formed thicker in a thicknesswise direction in which the water permeation prevention member is attached to the end of the sealing part than in a heightwise direction in which the water permeation prevention member is attached to the top and bottom of the sealing part, and the water permeation prevention member is attached by welding.

3 . The pouch-type secondary battery according to claim 1 , wherein a hole is formed by pressing the sealing part using a molding jig with a plurality of protrusions, and the water permeation prevention member fills the hole by welding and is attached to the entire sealing part.

4 . The pouch-type secondary battery according to claim 3 , wherein the hole is formed in a quadrangular shape along a lengthwise direction in which an electrode lead is formed.

5 . The pouch-type secondary battery according to claim 1 , wherein the water permeation prevention member includes polyethylene terephthalate (PET).

6 . The pouch-type secondary battery according to claim 1 , wherein the water permeation prevention member includes any one selected from selected from silicon-based, epoxy-based, cyanoacrylic acid-based, polyvinylacrylate-based, ethylene acetate-based, acrylate-based, polychloroprene-based, a compound-based of polyurethane resin and polyester resin, a compound-based of polyol and polyurethane resin, a compound-based of acrylic polymer and polyurethane resin, polyimide-based, and a compound-based of cyanoacrylate and urethane, or mixtures thereof.

7 . The pouch-type secondary battery according to claim 1 , wherein the water permeation prevention member includes any one of epoxy-based resin and silicon-based resin, or mixtures thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Du-Seong

Classifications

• H01M10/049 Primary

  Processes for forming or storing electrodes in the battery container · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/126

  comprising three or more layers · CPC title

• H01M50/184 Primary

  characterised by their shape or structure · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title