Packaging material for secondary battery, secondary battery, and method for manufacturing packaging material for secondary battery

Patent metadata

Field	Value
Publication number	US-10686169-B2
Application number	US-201615142763-A
Country	US
Kind code	B2
Filing date	Apr 29, 2016
Priority date	Nov 1, 2013
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

A secondary battery packaging material according to the present invention includes: a substrate layer having a first surface and containing polyester or polyamide; a metal foil layer laminated on the first surface of the substrate layer; an anti-corrosion treatment layer laminated on the metal foil layer; an adhesive layer laminated on the anti-corrosion treatment layer and containing two or more polyolefins; and a heat-sealable resin layer laminated on the adhesive layer. Of the two or more polyolefins, a first polyolefin having a highest melting temperature of the two or more polyolefins with a melting temperature of from not less than a heat-resistance imparting temperature to not more than a critical substrate layer thermal deterioration temperature; and of the two or more of polyolefins, and a second polyolefin having a lowest melting temperature of the two or more polyolefins with a melting temperature of from not less than a critical heat-resistance temperature to not more than a lamination temperature.

First claim

What is claimed is:

1. A secondary battery packaging material comprising:
a substrate layer having a first surface and the substrate layer containing polyester, polyamide, or a combination thereof;
a metal foil layer laminated on the first surface of the substrate layer;
an anti-corrosion treatment layer laminated on the metal foil layer;
an adhesive layer laminated on the anti-corrosion treatment layer and containing two or more polyolefins; and
a heat-sealable resin layer laminated on the adhesive layer,
wherein of the two or more of polyolefins of the adhesive layer, a first polyolefin having the highest melting temperature of the two or more olefins with a melting temperature of from not less than 90° C. to not more than 160° C.; and a second polyolefin having the lowest melting temperature of the two or more olefins with a melting temperature of from not less than 60° C. to not more than 90° C. and wherein the heat-sealable resin layer contains a third polyolefin, with the third polyolefin having a melting temperature of from not less than 90° C. to not more than 160° C., wherein the first polyolefin and the second polyolefin contained in the adhesive layer are cross-linked by an imide bond.

2. The secondary battery packaging material according to claim 1 ,
wherein the first polyolefin is contained in the adhesive layer at a ratio of from not less than 20 wt % to not more than 80 wt %; and
the second polyolefin is contained in the adhesive layer at a ratio of from not less than 20 wt % to not more than 80 wt %.

3. The secondary battery packaging material according to claim 1 ,
wherein the first polyolefin is any one of polybutenes, butene-ethylene copolymers, butene-propylene copolymers, butene-ethylene-propylene copolymers, and butene-α-olefin copolymers polymerized with one, or two or more of unsaturated carboxylic acids, anhydrides of the unsaturated carboxylic acids, and (meth)acrylic acid esters.

4. The secondary battery packaging material according to claim 1 ,
wherein the adhesive layer has a thickness of from not less than 1 μm to not more than 5 μm.

5. The secondary battery packaging material according to claim 1 ,
wherein the heat-sealable resin layer has a thickness of from not less than 20 μm to not more than 90 μm.

6. A secondary battery comprising the secondary battery packaging material according to claim 1 .

7. A method for manufacturing a secondary battery packaging material of claim 1 , which comprises at least a metal foil layer, an anti-corrosion treatment layer, an adhesive layer, and a heat-sealable resin layer laminated in this order on a first surface of a substrate layer, comprising:
applying a coating liquid onto the anti-corrosion treatment layer to form the adhesive layer, the coating liquid containing two or more polyolefins of which a first polyolefin with the highest melting temperature of the two or more polyolefins has a melting temperature of from not less than 90° C. to not more than 160° C., and a second polyolefin with the lowest melting temperature of the two or more olefins has a melting temperature of from not less than 60° C. to not more than 90° C., wherein the first polyolefin and the second polyolefin contained in the adhesive layer are cross-linked by an imide bond, and
performing dry lamination after forming the adhesive layer to form the heat-sealable resin layer on the adhesive layer, the dry lamination being performed using a heat-sealable resin containing a third polyolefin having a melting temperature of from not less than 90° C.-to not more than 160° C., at a temperature of equal to or more than the melting temperature of the second polyolefin but less than the melting temperature of the first polyolefin that is less than the melting temperature of the third polyolefin.

8. The method for manufacturing a secondary battery packaging material according to claim 7 , further comprising the step of performing aging treatment after forming the heat-sealable resin layer, the aging treatment being performed at a temperature of from not less than 20° C. to not more than 100° C., targeting the anti-corrosion treatment layer, the adhesive layer, and the heat-sealable resin layer.

9. The method for manufacturing a secondary battery packaging material according to claim 7 , further comprising heating the anti-corrosion treatment layer, the adhesive layer, and the heat-sealable resin layer after forming the heat-sealable resin layer, the heating being performed at a temperature ranging from not less than the melting temperature of the first polyolefin or not less than the melting temperature of the third polyolefin to not more than 160° C., followed by cooling to a temperature of less than a crystallization temperature of the adhesive layer that is less than a crystallization temperature of the heat-sealable resin layer.

10. The method for manufacturing a secondary battery packaging material according to claim 8 , further comprising heating the anti-corrosion treatment layer, the adhesive layer, and the heat-sealable resin layer after aging the anti-corrosion treatment layer, the adhesive layer, and the heat-sealable resin layer, the heating being performed at a temperature ranging from not less than the melting temperature of the first polyolefin or not less than the melting temperature of the third polyolefin to not more than 160° C., followed by cooling to a temperature of less than a crystallization temperature of the adhesive that is less than a crystallization temperature of the heat-sealable resin layer.

11. The method for manufacturing a secondary battery packaging material according to claim 10 , further comprising performing aging treatment after heating and cooling the anti-corrosion treatment layer, the adhesive layer, and the heat-sealable resin layer, the aging treatment being performed at a temperature of from not less than 20° C. to not more than 100° C., targeting the anti-corrosion treatment layer, the adhesive layer, and the heat-sealable resin layer.

12. A secondary battery packaging material comprising:
a substrate layer having a first surface and the substrate layer containing polyester, polyamide, or a combination thereof;
a metal foil layer laminated on the first surface of the substrate layer;
an anti-corrosion treatment layer laminated on the metal foil layer;
an adhesive layer laminated on the anti-corrosion treatment layer and containing two or more polyolefins; and
a heat-sealable resin layer laminated on the adhesive layer,
wherein of the two or more of polyolefins of the adhesive layer, a first polyolefin having the highest melting temperature of the two or more olefins with a melting temperature of from not less than 90° C. to not more than 160° C.; and a second polyolefin having the lowest melting temperature of the two or more olefins with a melting temperature of from not less than 60° C. to not more than 90° C. and
wherein the first polyolefin and the second polyolefin contained in the adhesive layer are cross-linked by an imide bond.

Assignees

• Toppan Printing Co Ltd

Inventors

• Muroi Yuki

Classifications

• H01M50/145

  for protecting against corrosion · CPC title

• H01M50/133

  Thickness · CPC title

• H01M50/129

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

• H01M50/119

  Metals · CPC title

• H01M50/121

  Organic material · CPC title