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

A method for manufacturing a packaging material for a power storage device, comprising:

• bonding a substrate layer to one surface of a metal foil layer via an adhesive layer;
• forming a substrate protective layer on a surface of the substrate layer on a side opposite of the adhesive layer, with the substrate protective layer being a cured product of a raw material containing a polyester resin, and a curing agent, the polyester resin having reactive groups reactive with the curing agent at a terminal position and/or in a side chain, the curing agent containing a first isocyanate, which is not an alicyclic isocyanate, and a second isocyanate, which is an alicyclic isocyanate, and the ratio ([a]/[b]) of the weight of the first isocyanate [a] to the weight of the second isocyanate [b] is 99/1 to 80/20;
• and
• forming a sealant layer via a sealant adhesive layer on a surface of the metal foil layer on a side opposite of the adhesive layer.

A method for manufacturing a packaging material for a power storage device, the method comprising:

• forming a substrate protective layer on one surface of a substrate layer, with the substrate protective layer being a cured product of a raw material containing a polyester resin, and a curing agent, the polyester resin having reactive groups reactive with the curing agent at a terminal position and/or in a side chain, the curing agent containing a first isocyanate, which is not an alicyclic isocyanate, and a second isocyanate, which an alicyclic isocyanate, and the ratio ([a]/[b]) of the weight of the first isocyanate [a] to the weight of the second isocyanate [b] is 99/1 to 80/20;
• bonding one surface of a metal foil layer via an adhesive layer to a surface of the substrate layer on a side opposite of the substrate protective layer;
• and
• forming a sealant layer via a sealant adhesive layer on a surface of the metal foil layer on a side opposite of the adhesive layer.