Secondary battery

Patent metadata

Field	Value
Publication number	US-10340489-B2
Application number	US-201715456187-A
Country	US
Kind code	B2
Filing date	Mar 10, 2017
Priority date	Apr 22, 2016
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A secondary battery includes an electrode assembly, a case accommodating the electrode assembly, and a cap assembly coupled to a top portion of the case. The cap assembly includes a cap-up, a safety vent under the cap-up, a cap-down under the safety vent, an insulator between the safety vent and the cap-down, and a sub-plate on a bottom surface of the cap-down. Laser patterns formed by using a laser beam are on a bottom surface of the safety vent and a top surface of the cap-down.

First claim

What is claimed is:

1. A secondary battery comprising:
an electrode assembly;
a case accommodating the electrode assembly; and
a cap assembly coupled to a top portion of the case, the cap assembly comprising a cap-up, a safety vent under the cap-up, a cap-down under the safety vent, an insulator between the safety vent and the cap-down, and a sub-plate on a bottom surface of the cap-down, laser patterns formed by using a laser beam being on a bottom surface of the safety vent and a top surface of the cap-down,
wherein the laser patterns on the safety vent have a ring shape extending along an outer peripheral edge of the safety vent, and
wherein the laser patterns comprise a first laser pattern and a second laser pattern, the second laser pattern being spaced from the first laser pattern with a smooth portion of the safety vent therebetween, the second laser pattern being at an exterior side of the first laser pattern.

2. The secondary battery of claim 1 , wherein the laser patterns each comprise a groove having a wedge shape.

3. The secondary battery of claim 2 , wherein an angle of the groove is about 60 degrees, and a depth of the groove is about 0.05 mm.

4. The secondary battery of claim 2 , wherein the insulator is fused to the safety vent and the cap-down by thermal fusion, and
wherein a protrusion is on a surface of the insulator corresponding to the grooves of the laser patterns.

5. The secondary battery of claim 1 , wherein a width of each of the first laser pattern and the second laser pattern is about 0.18 mm.

6. The secondary battery of claim 1 , wherein a distance between the first laser pattern and the second laser pattern is about 0.8 mm.

7. The secondary battery of claim 1 , wherein the laser patterns of the safety vent and the cap-down are at corresponding positions on the safety vent and on the cap-down.

8. The secondary battery of claim 1 , wherein the safety vent and the cap-down each comprise oxide coatings, and
wherein the oxide coatings are not present at portions of the safety vent and the cap-down at where the laser patterns are located.

9. The secondary battery of claim 8 , wherein the insulator is thermally fused to the laser patterns at the portions where the oxide coatings are not present.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Ko Sunggwi
• Seo Geunho

Classifications

• H01M50/167

  by crimping · CPC title

• H01M50/574

  Devices or arrangements for the interruption of current · CPC title

• B29C2045/14319

  bonding by a fusion bond · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• B29C66/30325

  making use of cavities belonging to at least one of the parts to be joined · CPC title