Secondary battery

Patent metadata

Field	Value
Publication number	US-2016308189-A1
Application number	US-201615079183-A
Country	US
Kind code	A1
Filing date	Mar 24, 2016
Priority date	Apr 17, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

A secondary battery includes an electrode assembly, a case, a cap plate, and a terminal plate. The electrode assembly includes a separator between first and second plates. The case includes the electrode assembly and has an opening. The cap plate seals the opening of the case and has a hole. The terminal plate is on the cap plate and includes a discharge hole aligned with the hole in the cap plate. A short circuit area with a vent may be included in the hole of the cap plate.

First claim

What is claimed is:

1 . A secondary battery, comprising:
an electrode assembly having a separator between first and second plates; a case including the electrode assembly and having an opening; a cap plate sealing the opening of the case and including a hole; and a terminal plate on the cap plate and including a discharge hole aligned with the hole in the cap plate, the hole including a short circuit area with a vent.

2 . The secondary battery as claimed in claim 1 , wherein the short circuit area includes a second area surrounding and extending from a first area.

3 . The secondary battery as claimed in claim 2 , wherein the first area is thicker than the second area.

4 . The secondary battery as claimed in claim 2 , wherein the first and second areas have rounded surfaces and different bend radii.

5 . The secondary battery as claimed in claim 2 , wherein the vent is in the first area and includes grooves that cross each other.

6 . The secondary battery as claimed in claim 1 , wherein the short circuit area includes a first area and a second area extending from the first area.

7 . The secondary battery as claimed in claim 6 , the first area is thinner than the second area.

8 . The secondary battery as claimed in claim 6 , wherein the first area has a rounded surface.

9 . The secondary battery as claimed in claim 6 , wherein the second area includes the vent and the vent has grooves with at least one intersecting point.

10 . A secondary battery, comprising:
a case; a terminal plate; an electrode assembly in the case; a cap plate connected to the case; and a short circuit area on or adjacent to the cap plate, wherein the short circuit area includes a conductive area, the conductive area to move from a first position to a second position under a first internal pressure in the case, the conductive area disconnected from the terminal plate in the first position and connected to the terminal plate in the second position to form a short circuit; a surrounding area surrounding the conductive area; and a vent on the conductive area or the surrounding area to open under a second internal pressure in the case different from the first internal pressure, the conductive area to move to the second position and the vent to open at different times.

11 . The secondary battery as claimed in claim 10 , wherein:
the second internal pressure is greater than the first internal pressure, and the vent is to open after the conductive area moves to the second position.

12 . The secondary battery as claimed in claim 10 , wherein the conductive area has a rounded surface.

13 . The secondary battery as claimed in claim 12 , wherein;
the conductive area has a first concavity, and the surrounding area has a second concavity which has a smaller depth than the first concavity.

14 . The secondary battery as claimed in claim 10 , wherein the vent includes grooves that cross each other.

15 . The secondary battery as claimed in claim 10 , wherein the vent is provided on the conductive area which is thicker than the surrounding area.

16 . The secondary battery as claimed in claim 15 , wherein:
the vent is aligned with a discharge hole in the terminal plate, and the surrounding area is offset relative to the discharge hole in the terminal plate.

17 . The secondary battery as claimed in claim 10 , wherein the vent is provided on the surrounding area which is thicker than the conductive area.

18 . The secondary battery as claimed in claim 17 , wherein;
the vent is aligned with a discharge hole in the terminal plate, and the conductive area is offset relative to the discharge hole in the terminal plate.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Jiho
• Bae Mincheol
• JEONG Ikjae
• Noh Kyounghwan
• Choi Hongkeun

Classifications

• H01M50/176

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

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M2/06

  Electricity · mapped topic

• H01M2/12

  Electricity · mapped topic

• H01M2/345 Primary

  Electricity · mapped topic