Secondary battery

Patent metadata

Field	Value
Publication number	US-10090497-B2
Application number	US-201715446308-A
Country	US
Kind code	B2
Filing date	Mar 1, 2017
Priority date	Apr 11, 2016
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A secondary battery includes a cylindrical can; an electrode assembly accommodated in the cylindrical can with an electrolyte; a cap assembly sealing the cylindrical can, a top-end height of the cap assembly being equal to or less than a top-end height of the cylindrical can; and an insulation layer on a surface of the cap assembly that is exposed to the outside of the cylindrical can.

First claim

What is claimed is:

1. A secondary battery comprising:
a cylindrical can;
an electrode assembly accommodated in the cylindrical can;
a cap assembly sealing the cylindrical can, a top-end height of the cap assembly being equal to or less than a top-end height of an electrically-conductive portion of the cylindrical can;
an insulation gasket between the cylindrical can and the cap assembly; and
an insulation layer on a surface of the cap assembly that is exposed to the outside of the cylindrical can.

2. The secondary battery of claim 1 , wherein the insulation layer comprises a polyimide film or a hot melt block.

3. The secondary battery of claim 1 , wherein the cap assembly comprises a cap-up comprising:
a terminal portion;
a bent portion downwardly bent from the terminal portion; and
an extending portion outwardly extending from the bent portion, and
wherein the insulation layer is on the extending portion of the cap-up.

4. The secondary battery of claim 3 , wherein a thickness of the insulation layer is less than a height of the bent portion.

5. The secondary battery of claim 3 , wherein a thickness of the insulation layer is equal to or less than a height of the bent portion.

6. The secondary battery of claim 3 , wherein the cap assembly further comprises a safety plate comprising:
a main body under the cap-up;
a main-body bent portion upwardly extending from a periphery of the main body; and
a main-body extending portion inwardly extending from the main-body bent portion and covering a top surface of the cap-up, and
wherein the insulation layer is on the main-body extending portion of the safety plate.

7. The secondary battery of claim 6 , wherein the insulation layer on the cap-up and the insulation layer on the safety plate are connected to each other.

8. The secondary battery of claim 1 ,
wherein the insulation layer is between the insulation gasket and the cap assembly.

9. The secondary battery of claim 1 , further comprising a lead tab connected to a top end of the cylindrical can.

10. The secondary battery of claim 9 , wherein the insulation layer is between the lead tab and the cap assembly.

11. The secondary battery of claim 1 , wherein an upper-most surface of the cylindrical can is electrically exposed and configured to be electrically connected to an external device.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Deakyu
• Ko Sunggwi
• Kim Shinjung

Classifications

• H01M50/593

  Spacers; Insulating plates · CPC title

• H01M50/167

  by crimping · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2/1241 Primary

  Electricity · mapped topic