Secondary battery and electrode lead assembly applied thereto

Patent metadata

Field	Value
Publication number	US-2016028068-A1
Application number	US-201414650094-A
Country	US
Kind code	A1
Filing date	Sep 24, 2014
Priority date	Sep 26, 2013
Publication date	Jan 28, 2016
Grant date	—

Abstract

A secondary battery according to the present disclosure includes an electrode assembly, a first lead plate connected to the electrode assembly, a second lead plate disposed facing the first lead plate with a gap therebetween such that at least a portion of the second lead plate overlaps with at least a portion of the first lead plate, a metal bridge disposed within the gap to connect the first lead plate and the second lead plate, a first sealant disposed within the gap further outside than the metal bridge, a pouch case to receive the electrode assembly such that the second lead plate is drawn outside, and a second sealant interposed respectively between an inner surface of the pouch case and the first lead plate and between the inner surface of the pouch case and the second lead plate.

First claim

What is claimed is:

1 . A secondary battery comprising:
an electrode assembly; a first lead plate connected to the electrode assembly; a second lead plate disposed facing the first lead plate with a gap therebetween such that at least a portion of the second lead plate overlaps with at least a portion of the first lead plate; a metal bridge disposed within the gap to connect the first lead plate and the second lead plate; a first sealant disposed within the gap further outside than the metal bridge; a pouch case to receive the electrode assembly such that the second lead plate is drawn outside; and a second sealant interposed respectively between an inner surface of the pouch case and the first lead plate and between the inner surface of the pouch case and the second lead plate.

2 . The secondary battery according to claim 1 , wherein the metal bridge is continuously formed along a widthwise direction of the first lead plate and the second lead plate.

3 . The secondary battery according to claim 1 , wherein the metal bridge is discontinuously formed along a widthwise direction of the first lead plate and the second lead plate.

4 . The secondary battery according to claim 1 , wherein the metal bridge is made of a metal having a lower melting point than the first lead plate and the second lead plate.

5 . The secondary battery according to claim 4 , wherein the metal bridge has the melting point from 150° C. to 300° C.

6 . The secondary battery according to claim 1 , wherein the first sealant is continuously formed along a widthwise direction of the first lead plate and the second lead plate to seal the pouch case.

7 . The secondary battery according to claim 6 , wherein the first sealant has a narrower width than the second sealant.

8 . The secondary battery according to claim 6 , wherein the first sealant has a venting notch formed in a direction facing the metal bridge from the electrode assembly.

9 . The secondary battery according to claim 8 , wherein the venting notch has a gradual decrease in width along a direction facing the metal bridge.

10 . The secondary battery according to claim 9 , wherein the venting notch has a wedge shape.

11 . An electrode lead assembly comprising:
a first lead plate; a second lead plate disposed facing the first lead plate with a gap therebetween such that at least a portion of the second lead plate overlaps with at least a portion of the first lead plate; a metal bridge disposed within the gap to connect the first lead plate and the second lead plate; a first sealant disposed within the gap further outside than the metal bridge; and a second sealant attached to an outer surface of the first lead plate and an outer surface of the second lead plate.

12 . The electrode lead assembly according to claim 11 , wherein the metal bridge is made of a metal having a lower melting point than the first lead plate and the second lead plate.

13 . The electrode lead assembly according to claim 12 , wherein the metal bridge has the melting point from 150° C. to 300° C.

14 . The electrode lead assembly according to claim 11 , wherein the first sealant is continuously formed along a widthwise direction of the first lead plate and the second lead plate.

15 . The electrode lead assembly according to claim 14 , wherein the first sealant has a narrower width than the second sealant.

16 . The electrode lead assembly according to claim 14 , wherein the first sealant has a venting notch formed in a direction facing the metal bridge from the first sealant.

17 . The electrode lead assembly according to claim 16 , wherein the venting notch has a gradual decrease in width along a direction facing the metal bridge.

18 . The electrode lead assembly according to claim 17 , wherein the venting notch has a wedge shape.

Assignees

• Lg Chemical Ltd

Inventors

• Yang Jung-Hoon
• Cho Young-Suk
• Kim Jong-Hun

Classifications

• H01M50/342 Primary

  Non-re-sealable arrangements · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/583

  in response to current, e.g. fuses · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/562

  characterised by the material · CPC title