Secondary battery

Patent metadata

Field	Value
Publication number	US-2018351206-A1
Application number	US-201815969123-A
Country	US
Kind code	A1
Filing date	May 2, 2018
Priority date	Jun 1, 2017
Publication date	Dec 6, 2018
Grant date	—

Abstract

Provided is a secondary battery that is capable of reducing resistance. The secondary battery includes an electrode assembly in which a positive electrode and a negative electrode are alternately laminated with a separator therebetween, a first bus bar laminated on the outside of the positive electrode disposed on the outermost portion of one side of the electrode assembly with a separator therebetween, a second bus bar laminated on the outside of the negative electrode disposed on the outermost portion of the other side of the electrode assembly with a separator therebetween, and a case accommodating the electrode assembly, the first bus bar, and the second bus bar.

First claim

What is claimed is:

1 . A secondary battery comprising:
an electrode assembly ( 100 ) in which a positive electrode and a negative electrode are alternately laminated with a separator therebetween; a first bus bar ( 200 ) laminated on the outside of the positive electrode disposed on the outermost portion of one side of the electrode assembly ( 100 ) with a separator therebetween; a second bus bar ( 300 ) laminated on the outside of the negative electrode disposed on the outermost portion of the other side of the electrode assembly ( 100 ) with a separator therebetween; and a case ( 10 ) accommodating the electrode assembly ( 100 ), the first bus bar ( 200 ), and the second bus bar ( 300 ).

2 . The secondary battery of claim 1 , wherein, in the electrode assembly ( 100 ), a positive electrode tab ( 111 ) extends from each of both ends of the positive electrode, and a negative electrode tab ( 121 ) extends from each of both ends of the negative electrode.

3 . The secondary battery of claim 2 , wherein a negative electrode active material is applied to an electrode assembly-side one surface of the first bus bar ( 200 ) to increase capacity of the electrode assembly ( 100 ).

4 . The secondary battery of claim 2 , wherein the first bus bar ( 200 ) comprises a negative electrode bus bar tab ( 210 ) electrically connected to the negative electrode tab ( 121 ).

5 . The secondary battery of claim 4 , wherein the negative electrode bus bar tab ( 210 ) of the first bus bar ( 200 ) is connected to the negative electrode tab ( 121 ) to reduce electric resistance of the negative electrode tab ( 121 ).

6 . The secondary battery of claim 2 , wherein a positive electrode active material is applied to an electrode assembly-side one surface of the second bus bar ( 300 ) to increase capacity of the electrode assembly ( 100 ).

7 . The secondary battery of claim 2 , wherein the second bus bar ( 300 ) comprises a positive electrode bus bar tab ( 310 ) electrically connected to the positive electrode tab ( 111 ).

8 . The secondary battery of claim 7 , wherein the positive electrode bus bar tab ( 310 ) of the second bus bar ( 300 ) is connected to the positive electrode tab ( 111 ) to reduce electric resistance of the positive electrode tab ( 111 ).

9 . The secondary battery of claim 2 , further comprising a positive electrode lead part ( 113 ) electrically connected to the positive electrode tab ( 111 ) to extend to the outside of the case ( 10 ).

10 . The secondary battery of claim 2 , further comprising a negative electrode lead part ( 123 ) electrically connected to the negative electrode tab ( 121 ) to extend to the outside of the case ( 10 ).

11 . The secondary battery of claim 1 , wherein the first bus bar ( 200 ) comprises a foil made of a copper (Cu) material.

12 . The secondary battery of claim 1 , wherein the second bus bar ( 300 ) comprises a foil made of an aluminum (Al) material.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Sun Kyu
• Kim Seok Koo

Classifications

• H01M50/533

  characterised by the shape of the leads or tabs · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2/26

  Electricity · mapped topic

• H01M2/202

  Electricity · mapped topic

• H01M10/4207

  for several batteries or cells simultaneously or sequentially · CPC title