Secondary battery and method for fabricating the same

Patent metadata

Field	Value
Publication number	US-2017040635-A1
Application number	US-201615301535-A
Country	US
Kind code	A1
Filing date	May 12, 2016
Priority date	Jun 16, 2015
Publication date	Feb 9, 2017
Grant date	—

Abstract

Provided is a pouch-type secondary battery which can increase spatial utility by reducing the length of a non-electrode region and a method for fabricating the same. The secondary battery according to the present disclosure is a secondary battery having a sealed structure such that an electrode assembly of positive electrode plate/separator/negative electrode plate is embedded in a pouch case and an electrode tab of the electrode assembly is joined to an electrode lead and juts outside, wherein the electrode tab is welded to a side surface perpendicular to a surface-wise direction of the secondary battery on the electrode lead arranged parallel to the surface-wise direction of the secondary battery, to form a welded part in a thickness-wise direction of the electrode lead between the electrode lead and the electrode tab.

First claim

What is claimed is:

1 . A secondary battery, having a sealed structure such that an electrode assembly of positive electrode plate/separator/negative electrode plate is embedded in a pouch case and an electrode tab of the electrode assembly is joined to an electrode lead and juts outside,
wherein the electrode tab is welded to a side surface perpendicular to a surface-wise direction of the secondary battery on the electrode lead arranged parallel to the surface-wise direction of the secondary battery, to form a welded part in a thickness-wise direction of the electrode lead between the electrode lead and the electrode tab.

2 . The secondary battery according to claim 1 , wherein the welded part is formed by welding one end of the electrode tab to the side surface of the electrode lead.

3 . The secondary battery according to claim 1 , wherein the electrode tab is multiple in number, the multiple electrode tabs are joined together to the side surface of the electrode lead by welding to form the welded part, and a thickness of the electrode lead is thicker than the sum of thicknesses of the multiple electrode tabs.

4 . The secondary battery according to claim 1 , wherein one end part of the electrode tab is bent 180 degrees and folded in dual layers to increase the thickness, and a bent part is welded to the side surface of the electrode lead to form the welded part.

5 . The secondary battery according to claim 4 , wherein the electrode tab is multiple in number and the multiple electrode tabs are bent together.

6 . The secondary battery according to claim 4 , wherein the electrode tab is multiple in number and the electrode tabs are individually bent.

7 . The secondary battery according to claim 1 , wherein the welded part has a width in a length-wise direction of the electrode lead that is less than or equal to 1 mm.

8 . A method for fabricating a secondary battery, the secondary battery having a sealed structure such that an electrode assembly of positive electrode plate/separator/negative electrode plate is embedded in a pouch case and an electrode tab of the electrode assembly is joined to an electrode lead and juts outside, the method comprising:
welding the electrode tab to a side surface perpendicular to a surface-wise direction of the secondary battery on the electrode lead arranged parallel to the surface-wise direction of the secondary battery, to form a welded part in a thickness-wise direction of the electrode lead between the electrode lead and the electrode tab.

9 . The method for fabricating a secondary battery according to claim 8 , wherein the welded part is formed by welding one end of the electrode tab to the side surface of the electrode lead.

10 . The method for fabricating a secondary battery according to claim 8 , wherein the electrode tab is multiple in number, the multiple electrode tabs are joined together to the side surface of the electrode lead by welding to form the welded part, and a thickness of the electrode lead is thicker than the sum of thicknesses of the multiple electrode tabs.

11 . The method for fabricating a secondary battery according to claim 8 , wherein one end part of the electrode tab is bent 180 degrees and folded in dual layers to increase the thickness, and a bent part is welded to the side surface of the electrode lead to form the welded part.

12 . The method for fabricating a secondary battery according to claim 11 , wherein the electrode tab is multiple in number and the multiple electrode tabs are bent together.

13 . The method for fabricating a secondary battery according to claim 11 , wherein the electrode tab is multiple in number and the electrode tabs are individually bent.

14 . The method for fabricating a secondary battery according to claim 8 , wherein the welding is performed by friction stir welding.

15 . A method for fabricating a secondary battery, comprising:
preparing an electrode assembly having an electrode plate to which an electrode tab is connected; bending one end part of the electrode tab once or more to increase a thickness; and joining a bent part of the electrode tab to a side surface of an electrode lead by friction stir welding.

16 . The method for fabricating a secondary battery according to claim 15 , wherein a thickness of the electrode lead is thicker than an overall thickness of the electrode tab.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Mi-Geum
• Choi Hang-June
• Mun Jeong-O

Classifications

• H01M10/058 Primary

  Construction or manufacture · CPC title

• B23K35/286

  Al as the principal constituent · CPC title

• B23K35/3053

  Fe as the principal constituent · CPC title

• B23K35/24

  Selection of soldering or welding materials proper (B23K35/34 takes precedence) · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title