Packaging material for power storage device
A packaging material for a power storage device includes a base material layer which has at least a first adhesive layer, a metal foil layer, a corrosion prevention-treated layer, a second adhesive layer, and a sealant layer, sequentially laminated on the side of the first surface thereof; and a base material protective layer formed from at least one selected from the group consisting of a polyester polyol and an acrylic polyol, each containing a group having a hydroxyl group in a side chain thereof, and an aliphatic isocyanate curing agent, laminated on the side of the second surface of in the base material layer.
1. A packaging material for a power storage device, comprising:
a base material layer being a stretched polyamide film having a first surface and a second surface;
a sealant layer;
a first adhesive layer laminated between the first surface of the stretched polyamide film and the sealant layer;
a first corrosion prevention-treated layer laminated between the first adhesive layer and the sealant layer;
a metal foil layer laminated between the first corrosion prevention-treated layer and the sealant layer;
a second corrosion prevention-treated layer laminated between the metal foil layer and the sealant layer;
a second adhesive layer laminated between the second corrosion prevention-treated layer and the sealant layer; and
a base material protective layer laminated and coated on the second surface of the stretched polyamide film,
the base material protective layer being a urethane resin formed from at least one polyol selected from the group consisting of polyester polyols and acrylic polyols, each of the polyester polyols and the acrylic polyols containing a group having a hydroxyl group in a side chain thereof,
the base material protective layer containing the urethane resin formed from an aliphatic isocyanate curing agent containing an isocyanate group (NCO), the base material protective layer having a matting-treated surface, the aliphatic isocyanate curing agent being 1,6-hexamethylene diisocyanate,
wherein a molar ratio (NCO/OH) of the isocyanate group (NCO) contained in the aliphatic isocyanate curing agent and the hydroxyl group (OH) contained in the at least one polyol is from 0.5 to 50.
2. The packaging material for a power storage device according to claim 1 , wherein the base material protective layer includes a filler added to the base material protective layer.
3. The packaging material for a power storage device according to claim 2 , wherein the filler includes a resin filler.
4. The packaging material for a power storage device according to claim 1 , wherein the metal foil layer is an aluminum foil.
5. The packaging material for a power storage device according to claim 1 , wherein the base material protective layer has a thickness of 1 to 10 μm.
6. The packaging material for a power storage device according to claim 1 , wherein the base material protective layer includes additives blended in the base material protective layer.
7. The packaging material for a power storage device according to claim 1 , wherein the urethane resin of the base material protective layer is a non-aqueous urethane.
8. The packaging material for a power storage device according to claim 1 , wherein the urethane resin has a glass transition temperature Tg of 0° C. to 60° C.