Lithium secondary battery including a gasket having an adhesive layer

Patent metadata

Field	Value
Publication number	US-9356263-B2
Application number	US-201113137900-A
Country	US
Kind code	B2
Filing date	Sep 21, 2011
Priority date	Feb 28, 2011
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A cylinder type lithium secondary battery may include an electrode assembly, a cylindrical can configured to retain the electrode assembly, a cap assembly coupled to a top opening of the cylindrical can, an electrolyte disposed in the cylindrical can, and a gasket between the cap assembly and the cylindrical can, the gasket including an adhesive layer having a reaction product of the electrolyte and a material of the gasket.

First claim

What is claimed is:

1. A lithium secondary battery, comprising:
an electrode assembly;
a cylindrical can configured to retain the electrode assembly;
a cap assembly coupled to a top opening of the cylindrical can;
an electrolyte disposed in the cylindrical can; and
a gasket between the cap assembly and the cylindrical can,
wherein the gasket, an entire thickness of which is a reaction product of the electrolyte and oriented polystyrene, contacts bottom and side surfaces of the cap assembly and contacts the cylindrical can, and
wherein the electrolyte includes a carbonate.

2. The lithium secondary battery as claimed in claim 1 , wherein the gasket includes a top portion positioned between the cap assembly and an inner wall of the cylindrical can, a mid portion horizontally extending from a lower end of the top portion, the mid portion having a top surface contacting a bottom edge of the cap assembly seated thereon, and a bottom portion extending from a lower end of the mid portion.

3. The lithium secondary battery as claimed in claim 2 , wherein the top portion, the mid portion, and the bottom portion of the gasket include oriented polystyrene.

4. The lithium secondary battery as claimed in claim 2 , wherein a portion of the gasket contacting the electrolyte includes the bottom portion and a portion of the gasket not contacting the electrolyte includes the top portion.

5. The lithium secondary battery as claimed in claim 2 , wherein the electrolyte contacts the bottom and side surfaces of the cap assembly or contacts the inner wall of the cylindrical can and a beading part.

6. The lithium secondary battery as claimed in claim 1 , wherein the electrolyte contacts a surface of the gasket.

7. The lithium secondary battery as claimed in claim 1 , wherein the gasket has a sealing pressure of about 23.00 kgf/cm 2 or higher.

8. The lithium secondary battery as claimed in claim 7 , wherein the gasket has a sealing pressure of about 29.000 kgf/cm 2 .

9. The lithium secondary battery as claimed in claim 1 , wherein the electrolyte includes dimethyl carbonate, diethyl carbonate, or dipropyl carbonate.

10. The lithium secondary battery as claimed in claim 1 , wherein the gasket is configured to support the cap assembly in the cylindrical can.

11. The lithium secondary battery as claimed in claim 1 , wherein the electrolyte includes methylpropyl carbonate ethylpropyl carbonate, or dipropyl carbonate.

12. The lithium secondary battery as claimed in claim 1 , wherein the electrolyte includes oriented polystyrene.

Assignees

• Kim Daekyu
• Samsung Sdi Co Ltd

Inventors

• Kim Daekyu

Classifications

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M50/197

  having a layered structure · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/198

  characterised by physical properties, e.g. adhesiveness or hardness · CPC title