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

Patent metadata

Field	Value
Publication number	US-10629863-B2
Application number	US-201715805221-A
Country	US
Kind code	B2
Filing date	Nov 7, 2017
Priority date	May 14, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

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 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

• B32B15/088

  comprising polyamides · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B25/16

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

• H01G11/78

  Cases; Housings; Encapsulations; Mountings · CPC title

• B32B2457/00

  Electrical equipment · CPC title