Packaging material for power storage device and method for manufacturing packaging material for power storage device

Patent metadata

Field	Value
Publication number	US-2018301671-A1
Application number	US-201816014379-A
Country	US
Kind code	A1
Filing date	Jun 21, 2018
Priority date	Feb 3, 2016
Publication date	Oct 18, 2018
Grant date	—

Abstract

The present invention relates to a packaging material for a power storage device, the packaging material having a structure in which at least a substrate protective layer, a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer are laminated in this order, wherein the substrate protective layer is a cured product of a raw material containing a polyester resin and a polyisocyanate, a ratio [NCO]/[OH] is 5 to 60, where [OH] is the number of moles of hydroxyl groups in the polyester resin, and [NCO] is the number of moles of isocyanate groups in the polyisocyanate, and the polyester resin has a hydroxyl value of 10 to 70 KOHmg/g.

First claim

What is claimed is:

1 . A packaging material for a power storage device, comprising:
a structure in which at least a substrate protective layer, a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer are laminated in this order, wherein the substrate protective layer is a cured product of a raw material containing a polyester resin and a polyisocyanate, wherein a ratio [NCO]/[OH] is 5 to 60, where [OH] is the number of moles of hydroxyl groups in the polyester resin, and [NCO] is the number of moles of isocyanate groups in the polyisocyanate, and the polyester resin has a hydroxyl value of 10 to 70 KOHmg/g.

2 . A packaging material for a power storage device, comprising:
structure in which at least a substrate protective layer, a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer are laminated in this order, wherein the substrate protective layer is a cured product of a raw material containing an aromatic polyester urethane resin and a polyisocyanate, and wherein a ratio [NCO]/[OH] is 5 to 20, where [OH] is the number of moles of hydroxyl groups in the aromatic polyester urethane resin, and [NCO] is the number of moles of isocyanate groups in the polyisocyanate.

3 . The packaging material for a power storage device of claim 1 , wherein when a constant voltage of 100 V is applied for 3 minutes between the substrate protective layer and the metal foil layer in a state in which water is attached to the substrate protective layer, the insulation resistance between the layers is 2000 MS2 or more.

4 . The packaging material for a power storage device of claim 1 , wherein the polyisocyanate contains 50 mass % or more of polyisocyanate that does not have an alicyclic structure.

5 . The packaging material for a power storage device of claim 4 , wherein the polyisocyanate that does not have an alicyclic structure is an aliphatic polyisocyanate.

6 . The packaging material for a power storage device of claim 4 , wherein the polyisocyanate that does not have an alicyclic structure is an adduct or biuret form of an aliphatic polyisocyanate.

7 . The packaging material for a power storage device of claim 2 , wherein the aromatic polyester urethane resin is a blend of two or more aromatic polyester urethane resins having different glass transition temperatures (Tg).

8 . The packaging material for a power storage device of claim 1 , wherein the raw material further contains a filler.

9 . A method for manufacturing a packaging material for a power storage device, the method comprising the steps of:
bonding a substrate layer to one surface of a metal foil layer with an adhesive layer interposed therebetween; forming a substrate protective layer on a surface of the substrate layer which faces away from the adhesive layer; and forming a sealant layer on a surface of the metal foil layer which faces away from the adhesive layer with a sealant adhesive layer interposed therebetween, wherein the substrate protective layer is a cured product of a raw material containing a polyester resin and a polyisocyanate, a ratio [NCO]/[OH] is 5 to 60, where [OH] is the number of moles of hydroxyl groups in the polyester resin, and [NCO] is the number of moles of isocyanate groups in the polyisocyanate, and the polyester resin has a hydroxyl value of 10 to 70 KOHmg/g.

10 . A method for manufacturing a packaging material for a power storage device, the method comprising the steps of:
bonding a substrate layer to one surface of a metal foil layer with an adhesive layer interposed therebetween; forming a substrate protective layer on a surface of the substrate layer which faces away from the adhesive layer; and forming a sealant layer on a surface of the metal foil layer which faces away from the adhesive layer with a sealant adhesive layer interposed therebetween, wherein the substrate protective layer is a cured product of a raw material containing an aromatic polyester urethane resin and a polyisocyanate, and a ratio [NCO]/[OH] is 5 to 20, where [OH] is the number of moles of hydroxyl groups in the aromatic polyester urethane resin, and [NCO] is the number of moles of isocyanate groups in the polyisocyanate.

Assignees

• Toppan Printing Co Ltd

Inventors

• Muraki Takuya
• Yamazaki Tomohiko
• Suzuta Masayoshi

Classifications

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/78 Primary

  Cases; Housings; Encapsulations; Mountings · CPC title

• H01G11/84

  Processes for the manufacture of hybrid or EDL capacitors, or components thereof · CPC title

• H01G11/82

  Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations · CPC title

• H01M10/38

  Construction or manufacture · CPC title