Method for sealing pouch casing of secondary battery

Patent metadata

Field	Value
Publication number	US-2019207171-A1
Application number	US-201715776248-A
Country	US
Kind code	A1
Filing date	Sep 28, 2017
Priority date	Sep 28, 2016
Publication date	Jul 4, 2019
Grant date	—

Abstract

The present disclosure relates to a method for sealing a pouch casing of a pouch-type secondary battery, which includes the steps of: a receiving step in which an electrode assembly is received in an inner space formed between an upper pouch and a lower pouch; and a sealing step in which a first pressure is applied to an outer circumferential sealing portion, where the upper pouch and the lower pouch are sealed, in the longitudinal direction, and then the pressure is relieved, wherein the sealing step is carried out by applying external force to the upper pouch in the upward direction and to the lower pouch in the downward direction, or by applying a second pressure working in perpendicular to the first pressure to the sealing portion from the inner part of the pouch casing in a direction toward the outside.

First claim

What is claimed is:

1 . A method for sealing a pouch casing of a pouch-type secondary battery, which comprises the steps of:
a receiving step in which an electrode assembly is received in an inner space formed between an upper pouch and a lower pouch; and a sealing step in which a first pressure is applied to an outer circumferential sealing portion, where the upper pouch and the lower pouch are sealed, in the longitudinal direction, and then the pressure is relieved, wherein the sealing step is carried out by applying external force to the upper pouch in the upward direction and to the lower pouch in the downward direction, or by applying a second pressure working in perpendicular to the first pressure to the sealing portion from the inner part of the pouch casing in a direction toward the outside.

2 . The method for sealing a pouch casing according to claim 1 , wherein the sealing step is carried out so that the shape of a temporary attachment region, formed by the sealing portion pushed in a direction toward the inner space based on the parallel bonded end of the outer circumferential sealing portion of the upper pouch and the lower pouch, may not have a ball shape locally.

3 . The method for sealing a pouch casing according to claim 1 , wherein the sealing step is carried out by a heating block which performs hot fusion of the outer circumferential sealing portion of the upper pouch and the lower pouch through the transfer of a heat source.

4 . The method for sealing a pouch casing according to claim 1 , wherein the sealing step is carried out by applying external force to the upper pouch in the upward direction and to the lower pouch in the downward direction by using a vacuum adsorption pad.

5 . The method for sealing a pouch casing according to claim 1 , wherein the second pressure in the sealing step is a pneumatic pressure.

6 . The method for sealing a pouch casing according to claim 1 , wherein the extent of the external force applied to the upper pouch in the upward direction is 2-5 times of the weight of the upper pouch, and the extent of the external force applied to the lower pouch in the downward direction is 2-5 times of the weight of the lower pouch.

7 . The method for sealing a pouch casing according to claim 1 , wherein the external force application time in the sealing step is 1.5-2 times of the first pressure application time.

8 . The method for sealing a pouch casing according to claim 1 , wherein the second pressure in the sealing step is 0.1-0.15 MPa.

9 . The method for sealing a pouch casing according to claim 1 , wherein the second pressure application time in the sealing step is 1.5-2 times of the first pressure application time.

10 . The method for sealing a pouch casing according to claim 1 , wherein the upper pouch and the lower pouch independently include a metal layer, an insulation layer formed on one surface of the metal layer, and an adhesive layer formed on the other surface of the metal layer.

11 . The method for sealing a pouch casing according to claim 10 , wherein the metal layer is an aluminum layer.

12 . The method for sealing a pouch casing according to claim 10 , wherein the insulation layer includes polyethylene terephthalate resin, nylon resin or a combination thereof.

13 . The method for sealing a pouch casing according to claim 10 , wherein the adhesive layer includes casted polypropylene, polypropylene or a combination thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Yong-Su
• Kim Sang-Hun
• Kang Min-Hyeong
• Kim Yong
• Kim Cho-Long
• Yu Hyung-Kyun
• Lee Ji-Hoon
• Hwang Soo-Ji

Classifications

• H01M10/0404 Primary

  Machines for assembling batteries · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/566

  by welding, soldering or brazing · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title