Secondary battery

Patent metadata

Field	Value
Publication number	US-2017047565-A1
Application number	US-201615093330-A
Country	US
Kind code	A1
Filing date	Apr 7, 2016
Priority date	Aug 13, 2015
Publication date	Feb 16, 2017
Grant date	—

Abstract

A secondary battery according to one or more embodiments includes a case defining an inner space, an electrode assembly in the case, the electrode assembly including a first electrode plate, a second electrode plate, and a separator between the first and second electrode plates, a cap plate sealing the case and electrically connected to the first electrode plate of the electrode assembly, the cap plate including a safety vent, an electrode terminal part extending through the cap plate, and a connector having a first end electrically connected to the electrode terminal part and a second end electrically connected to the safety vent.

First claim

What is claimed is:

1 . A secondary battery comprising:
a case defining an inner space; an electrode assembly in the case, the electrode assembly comprising:
a first electrode plate;
a second electrode plate; and
a separator between the first and second electrode plates;
a cap plate sealing the case and electrically connected to the first electrode plate of the electrode assembly, the cap plate comprising a safety vent; an electrode terminal part extending through the cap plate; and a connector having a first end electrically connected to the electrode terminal part and a second end electrically connected to the safety vent.

2 . The secondary battery of claim 1 , further comprising a lead tab electrically connected to the electrode assembly, and electrically connecting the cap plate to the first electrode.

3 . The secondary battery of claim 2 , wherein the lead tab comprises:
a collection part contacting the first electrode plate; an extension part extending from an upper portion of the collection part; and a contact part at an end of the extension part.

4 . The secondary battery of claim 1 , wherein the electrode terminal part comprises:
a coupling terminal; an electrode terminal extending through the cap plate and through the coupling terminal, and electrically coupled to the coupling terminal; and a coupling plate electrically insulating the coupling terminal from the cap plate.

5 . The secondary battery of claim 4 , further comprising an insulation member between the cap plate and the lead tab.

6 . The secondary battery of claim 1 , wherein the cap plate defines a vent opening,
wherein the safety vent is coupled to the cap plate at the vent opening to seal the vent opening, and wherein the safety vent is electrically connected to the cap plate.

7 . The secondary battery of claim 6 , wherein the safety vent comprises:
a fixed part fixed to the cap plate at the vent hole; a rupture part inside the fixed part and defining a notch; and a coupling part inside the rupture part, and electrically coupled to the second end of the connector.

8 . The secondary battery of claim 7 , wherein the vent opening is defined by a stepped surface of the cap plate, and
wherein the fixed part is coupled to the stepped surface.

9 . The secondary battery of claim 7 , further comprising a connection part connecting the fixed part to the rupture part,
wherein the connection part has a concave shape in which a lower surface of the coupling part protrudes inwardly toward the inside of the case.

10 . The secondary battery of claim 7 , wherein the coupling part has a thickness that is greater than thicknesses of the fixed part, the rupture part, and the connection part.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Byun Sangwon
• Oh Jeongwon

Classifications

• H01M50/566

  by welding, soldering or brazing · CPC title

• H01M50/562

  characterised by the material · CPC title

• H01M50/567

  by fixing means, e.g. screws, rivets or bolts · CPC title

• H01M50/176

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

• H01M50/553

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