Rechargeable battery

Patent metadata

Field	Value
Publication number	US-9837648-B2
Application number	US-201514829557-A
Country	US
Kind code	B2
Filing date	Aug 18, 2015
Priority date	Feb 27, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A rechargeable battery includes: an electrode assembly having a first electrode and a second electrode; an electrode terminal electrically connected to the electrode assembly; a case that receives the electrode assembly; a cap plate at an opening of the case, the cap plate closing and sealing the case and having a vent hole configured to discharge an internal pressure of the case; and a vent module including a vent portion, the vent portion including a buffer portion configured to buffer an impact that is transferred to the vent hole, and a fracture portion that closes and seals the vent hole, wherein the fracture portion is configured to be fractured by the internal pressure.

First claim

What is claimed is:

1. A rechargeable battery, comprising:
an electrode assembly having a first electrode and a second electrode;
an electrode terminal electrically connected to the electrode assembly;
a case that receives the electrode assembly;
a cap plate at an opening of the case, the cap plate closing and sealing the case and having a vent hole configured to discharge an internal pressure of the case; and
a vent module comprising:
a vent portion comprising:
a buffer portion configured to buffer an impact that is transferred to the vent hole; and
two or more fracture portions that close and seal the vent hole, each fracture portion having a thickness that is less than a thickness of the buffer portion, wherein the fracture portion is configured to be fractured by the internal pressure; and

a fixing portion fixed at an inner wall surface of the vent hole, and connected to the vent portion,

wherein ones of the fracture portions and the buffer portion alternate with each other,
wherein the buffer portion protrudes in a round shape between the fracture portions, and
wherein the thickness of the buffer portion is less than a thickness of the fixing portion.

2. The rechargeable battery of claim 1 , wherein the inner wall surface of the vent hole has an Insertion groove that receives the fixing portion.

3. The rechargeable battery of claim 2 , wherein the fixing portion is welded to the vent hole.

4. The rechargeable battery of claim 1 , wherein one of the fracture portion located at or below a center region of the fixing portion.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Chi-Young
• Jang Myung-Jae
• Byun Sang-Won

Classifications

• H01M50/176

  for prismatic or rectangular cells (H01M50/181 takes precedence) · CPC title

• H01M50/103

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/553

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

• H01M50/55

  on the same side of the cell · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title