Sealing apparatus for secondary battery

Patent metadata

Field	Value
Publication number	US-2018175337-A1
Application number	US-201615737356-A
Country	US
Kind code	A1
Filing date	Oct 11, 2016
Priority date	Dec 11, 2015
Publication date	Jun 21, 2018
Grant date	—

Abstract

The present invention relates to a sealing apparatus for a secondary battery, which seals a sealing part of a case in which an electrode assembly and an electrolyte are accommodated, and the sealing apparatus comprises a sealing member comprising a first sealing piece and a second sealing piece, which thermally fuse a surface of the sealing part to seal the sealing part, wherein the first sealing piece and the second sealing piece comprise a plurality of thermal fusion parts, which are disposed from an outer end of a surface of the sealing part toward an inner end that is opposite to the outer end to thermally fuse the surface of the sealing part, and non-thermal fusion parts, which are disposed between the plurality of thermal fusion parts and do not seal the surface of the sealing part.

First claim

1 . A sealing apparatus for a secondary battery, which seals a sealing part of a case in which an electrode assembly and an electrolyte are accommodated, the sealing apparatus comprising:
a sealing member comprising a first sealing piece and a second sealing piece, which thermally fuse a surface of the sealing part to seal the sealing part, wherein the first sealing piece and the second sealing piece comprise a plurality of thermal fusion parts, which are disposed from an outer end of a surface of the sealing part toward an inner end that is opposite to the outer end to thermally fuse the surface of the sealing part, and non-thermal fusion parts, which are disposed between the plurality of thermal fusion parts and do not seal the surface of the sealing part.

2 . The sealing apparatus of claim 1 , wherein each of the non-thermal fusion parts is provided as an opening groove that is opened in a direction of the surface of the sealing part.

3 . The sealing apparatus of claim 1 , wherein the non-thermal fusion part of the first sealing piece and the non-thermal fusion part of the second sealing piece are disposed to correspond to each other.

4 . The sealing apparatus of claim 1 , wherein the thermal fusion part disposed on the inner end of the sealing part has an upward inclined surface that is inclined toward the inner end of the sealing part, and
the upward inclined surface gradually decreases pressing force toward the inner end of the sealing part to deform a width of the inner end of the sealing part so that the width gradually increases.

5 . The sealing apparatus of claim 1 , wherein the thermal fusion part disposed on the outer end of the sealing part has a downward inclined surface that is inclined toward the outer end of the sealing part, and
the downward inclined surface gradually increases pressing force toward the outer end of the sealing part to deform a shape of the outer end of the sealing part into a sharp shape.

6 . The sealing apparatus of claim 1 , further comprising a welding member that welds the outer end of the sealing part to seal the sealing part.

7 . The sealing apparatus of claim 6 , wherein the welding member uses ultrasonic welding or laser welding.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Sang Kyun
• Ku Cha Hun

Classifications

• H01M50/186 Primary

  characterised by the disposition of the sealing members · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/184 Primary

  characterised by their shape or structure · CPC title

• H01M2/08 Primary

  Electricity · mapped topic

• H01M10/04

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title