Tab lead for secondary battery, and nonaqueous electrolyte secondary battery using the same

Patent metadata

Field	Value
Publication number	US-2016248074-A1
Application number	US-201615046737-A
Country	US
Kind code	A1
Filing date	Feb 18, 2016
Priority date	Feb 23, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

Provided is a tab lead for a secondary battery including tab lead metal that has an adhesion interface with sealing resin. The adhesion interface is provided with a surface treatment film formed of a material including a polymer with carboxylic acid anhydride groups. Further provided is a nonaqueous electrolyte secondary battery including the tab lead for the secondary battery as a leading terminal of at least one of a positive electrode and a negative electrode.

First claim

What is claimed is:

1 . A tab lead for a secondary battery, comprising tab lead metal, the tab lead metal having an adhesion interface with sealing resin, wherein the adhesion interface is provided with a surface treatment film formed of a material including a polymer with carboxylic acid anhydride groups.

2 . The tab lead for a secondary battery according to claim 1 , wherein the polymer included in the material for the surface treatment film has the carboxylic acid anhydride groups and carboxylic groups.

3 . The tab lead for a secondary battery according to claim 2 , wherein the number of the carboxylic acid anhydride groups is more than the number of the carboxylic groups.

4 . The tab lead for a secondary battery according to claim 2 , wherein peak intensity of the carboxylic acid anhydride group is higher than peak intensity of the carboxylic group in a Raman spectroscopic analysis of the surface treatment film.

5 . The tab lead for a secondary battery according to claim 3 , wherein peak intensity of the carboxylic acid anhydride group is higher than peak intensity of the carboxylic group in a Raman spectroscopic analysis of the surface treatment film.

6 . The tab lead for a secondary battery according to claim 1 , wherein the amount of carbon in the surface treatment film is 10 μg/cm 2 or more by a high-frequency combustion-infrared absorption method.

7 . The tab lead for a secondary battery according to claim 2 , wherein the amount of carbon in the surface treatment film is 10 μg/cm 2 or more by a high-frequency combustion-infrared absorption method.

8 . The tab lead for a secondary battery according to claim 1 , wherein the tab lead metal is at least one metal selected from nickel, copper, and aluminum.

9 . The tab lead for a secondary battery according to claim 2 , wherein the tab lead metal is at least one metal selected from nickel, copper, and aluminum.

10 . The tab lead for a secondary battery according to claim 1 , wherein the surface treatment film is formed by applying a solution of polycarboxylic acid on the tab lead metal and then performing heat treatment.

11 . The tab lead for a secondary battery according to claim 2 , wherein the surface treatment film is formed by applying a solution of polycarboxylic acid on the tab lead metal and then performing heat treatment.

12 . The tab lead for a secondary battery according to claim 10 , wherein the polycarboxylic acid is polyacrylic acid, polymethacrylic acid, or a salt thereof.

13 . The tab lead for a secondary battery according to claim 11 , wherein the polycarboxylic acid is polyacrylic acid, polymethacrylic acid, or a salt thereof.

14 . A nonaqueous electrolyte secondary battery comprising the tab lead according to claim 1 as a leading terminal of at least one of a positive electrode and a negative electrode.

15 . A nonaqueous electrolyte secondary battery comprising the tab lead according to claim 2 as a leading terminal of at least one of a positive electrode and a negative electrode.

16 . The nonaqueous electrolyte secondary battery according to claim 14 , comprising the package for the secondary battery including a laminated film.

17 . The nonaqueous electrolyte secondary battery according to claim 15 , comprising the package for the secondary battery including a laminated film.

Assignees

• Automotive Energy Supply Corp

Inventors

• Suguro Masahiro
• Taguchi Hiromoto
• Tanjo Yuji

Classifications

• H01M10/0525 Primary

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

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/124

  having a layered structure · CPC title