Materials for power storage devices and power storage devices using the same

Patent metadata

Field	Value
Publication number	US-11264662-B2
Application number	US-202016735271-A
Country	US
Kind code	B2
Filing date	Jan 6, 2020
Priority date	Jul 10, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A power storage device packaging material includes a structure including at least a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer, which are laminated in this order, wherein the adhesive layer has a yield stress in the range of 3500 to 6500 N/cm2 and breaking elongation of 45 to 200% in a stress-strain curve determined by a tensile test at a tension rate of 6 mm/min. A power storage device packaging material according to the second aspect of the present disclosure includes a structure including at least a substrate layer, an adhesive layer, a metal foil layer, an anticorrosion treatment layer, a sealant adhesive layer, and a sealant layer, which are laminated in this order, wherein the adhesive layer has a glass transition temperature in a range of 140° C. or more and 160° C. or less.

First claim

What is claimed is:

1. A power storage device packaging material, comprising:
a structure including at least a substrate layer, an adhesive layer, a metal foil layer, a sealant adhesive layer, and a sealant layer, which are laminated in this order,
wherein the adhesive layer has a yield stress in the range of 3500 to 6500 N/cm 2 and breaking elongation of 45 to 200% in a stress-strain curve determined by a tensile test at a tension rate of 6 mm/min, and wherein the adhesive layer is made of a two-part curing type polyurethane-based adhesive comprising a base resin made of polyol and a hardener made of an isocyanate compound, wherein a molar ratio of a quantity of NC groups in the hardener, to a quantity of hydroxyl groups in the base resin is from 10 to 30.

2. The power storage device packaging material of claim 1 , further comprising an adhesion-enhancing treatment layer provided between the substrate layer and the adhesion layer.

3. The power storage device packaging material of claim 2 , wherein the adhesion-enhancing treatment layer is a layer including at least one resin selected from a group consisting of a polyester resin, an acrylic resin, a polyurethane resin, an epoxy resin, and an acrylic grafted polyester resin.

4. The power storage device packaging material of claim 1 , further comprising anticorrosion treatment layers respectively provided on both surfaces of the metal foil layer.

5. The power storage device packaging material of claim 4 , wherein the anticorrosion treatment layers include a rare earth element oxide, and phosphoric acid or phosphate.

6. The power storage device packaging material of claim 5 , wherein the rare earth element oxide is a cerium oxide.

7. A power storage device comprising: a battery element including electrodes; leads respectively extending from the electrodes; and a container accommodating the battery element, wherein
the container is formed of the power storage device packaging material of claim 1 with the sealant layer being located on the inside.

8. A power storage device packaging material comprising a structure including at least a substrate layer, an adhesive layer, a metal foil layer, a first anticorrosion treatment layer, a sealant adhesive layer, and a sealant layer, which are laminated in this order, wherein
the adhesive layer has a glass transition temperature in a range of 140° C. or more and 160° C. or less and wherein the adhesive layer is made of a two-part curing type polyurethane-based adhesive comprising a base resin made of polyol and a hardener made of an isocyanate compound, wherein a molar ratio of a quantity of NC groups in the hardener, to a quantity of hydroxyl groups in the base resin is from 10 to 30.

9. The power storage device packaging material of claim 8 , wherein the isocyanate compound is an aromatic isocyanate compound.

10. The power storage device packaging material of claim 9 , wherein the aromatic isocyanate compound is an adduct form of diisocyanate.

11. The power storage device packaging material of claim 8 , further comprising a second anticorrosion treatment layer provided between the adhesive layer and the metal foil layer.

12. The power storage device packaging material of claim 8 , further comprising an adhesion-enhancing treatment layer provided between the substrate layer and the adhesive layer, wherein
the adhesion-enhancing treatment layer is a layer including at least one resin selected from a group consisting of a polyester resin, an acrylic resin, a polyurethane resin, an epoxy resin, and an acrylic grafted polyester resin.

13. The power storage device packaging material of claim 8 , further comprising an adhesion-enhancing treatment layer provided between the substrate layer and the adhesive layer, wherein
the adhesion-enhancing treatment layer is a layer including a polyester resin.

Assignees

• Toppan Printing Co Ltd

Inventors

• Sasaki Satoshi
• Muraki Takuya
• Yamazaki Tomohiko
• Suzuta Masayoshi

Classifications

• H01M50/133

  Thickness · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/131

  characterised by physical properties, e.g. gas permeability, size or heat resistance · CPC title

• H01M50/145

  for protecting against corrosion · CPC title

• H01M50/193

  Organic material · CPC title