Packaging material for power storage device and power storage device using the packaging material

Patent metadata

Field	Value
Publication number	US-2018108880-A1
Application number	US-201715805221-A
Country	US
Kind code	A1
Filing date	Nov 7, 2017
Priority date	May 14, 2015
Publication date	Apr 19, 2018
Grant date	—

Abstract

The present invention relates to a packaging material for a power storage device including at least a substrate layer, an adhesive layer, a metal foil layer, an anti-corrosion treatment layer, an adhesive resin layer and a thermal bonding resin layer laminated in this order, wherein a thickness of the adhesive layer is in a range of 0.3 to 3 μm, a 10-point average roughness Rzjis (in accordance with JIS B0601) of a surface of the metal foil layer which faces the substrate layer is in a range of 0.3 to 3 μm, and the thickness of the adhesive layer is not less than the 10-point average roughness Rzjis and not more than 3 μm, and a peel strength between the substrate layer and the metal foil layer (in accordance with JIS K6854-3) is in a range of 5 to 12 N/15 mm.

First claim

What is claimed is:

1 . A packaging material for a power storage device, the packaging material comprising at least a substrate layer, an adhesive layer, a metal foil layer, an anti-corrosion treatment layer, an adhesive resin layer and a thermal bonding resin layer laminated in this order, wherein
a thickness of the adhesive layer is in a range of 0.3 to 3 μm, a 10-point average roughness Rzjis in accordance with JIS B0601 of a surface of the metal foil layer which faces the substrate layer is in a range of 0.3 to 3 μm, and the thickness of the adhesive layer is not less than the 10-point average roughness Rzjis and not more than 3 μm, and a peel strength between the substrate layer and the metal foil layer in accordance with JIS K6854-3 is in a range of 5 to 12 N/15 mm.

2 . The packaging material for a power storage device of claim 1 , wherein a ratio of a thickness X of the substrate layer to a thickness Y of the adhesive layer, X/Y, is in a range between 4 and 50.

3 . The packaging material for a power storage device of claim 1 , wherein the adhesive layer is made of a two-part curable urethane-based adhesive in which a base resin including polyol is configured to react with a hardener including bifunctional or higher functional aromatic or aliphatic isocyanate, and an equivalence ratio of an isocyanate group of the hardener to a hydroxyl group of the base resin ([NCO]/[OH]) is in a range between 1 and 50.

4 . The packaging material for a power storage device of claim 1 , wherein the substrate layer includes at least one of a polyamide film and a polyester film.

5 . The packaging material for a power storage device of claim 4 , wherein
the substrate layer includes the polyamide film and the polyester film laminated via a second adhesive layer, and the second adhesive layer is made of the same adhesive as the adhesive layer, and the thickness of the second adhesive layer is in a range of 0.3 to 3 μm.

6 . The packaging material for a power storage device of claim 1 , further comprising a second anti-corrosion treatment layer that is further disposed between the adhesive layer and the metal foil layer.

7 . The packaging material for a power storage device of claim 1 , further comprising a corona treatment, frame treatment, primer treatment or ultraviolet radiation treatment being applied on a surface of the substrate layer which faces the metal foil layer.

8 . A power storage device comprising:
a power storage device element that includes a positive electrode and a negative electrode; a metal terminal connected to each of the positive electrode and the negative electrode; and a packaging material having a molded section with a depth of 6 mm or more that accommodates the power storage device element, wherein the packaging material is the packaging material for a power storage device according to claim 1 , and wherein the packaging material is folded over with the thermal bonding resin layer facing inward and end portions of the packaging material are thermally press-bonded to seal the power storage device element and hold the metal terminal to be partially exposed outside.

Assignees

• Toppan Printing Co Ltd

Inventors

• Muroi Yuki

Classifications

• H01G4/228 Primary

  Terminals · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• B32B25/16

  comprising polydienes {homopolymers} or poly-halodienes {homopolymers (B32B25/12 takes precedence)} · CPC title

• B32B2255/20

  Inorganic coating · CPC title

• H01G4/224

  Housing; Encapsulation · CPC title