Power storage device

A power storage device comprising:

• a first packaging material in which a first heat resistant resin layer is adhered to one surface of a first metal foil and a first heat fusible resin layer is adhered to the other surface of the first metal foil, wherein the first packaging material is provided with a first inner conducting portion allowing conduction to the first metal foil on a surface of the first heat fusible resin layer side;
• a second packaging material in which a second heat resistant resin layer is adhered to one surface of a second metal foil and a second heat fusible resin layer is adhered to the other surface of the second metal foil, wherein the second packaging material is provided with a second inner conducting portion allowing conduction to the second metal foil on a surface of the second heat fusible resin layer side, and
• an electrode body including a positive electrode in which a positive electrode active material is coated on a positive electrode current collector, a negative electrode in which a negative electrode active material is coated on a negative electrode current collector, and a separator disposed between the positive electrode and the negative electrode, wherein
• a packaging member having an electrode body chamber in which the first inner conducting portion and the second inner conducting portion face in the chamber is formed such that the first heat fusible resin layer of the first packaging material and the second heat fusible resin layer of the second packaging material face each other and the chamber is surrounded by a heat-sealed portion in which the first heat fusible resin layer and the second heat fusible resin layer are fusion-bonded,
• the positive electrode of the electrode body sealed in the electrode body chamber together with an electrolyte is conducted to the first inner conducting portion, and the negative electrode thereof is conducted to the second inner conducting portion,
• at least one of a pair of the first metal foil and the positive electrode current collector and a pair of the second metal foil and the negative electrode current collector is made of the same kind of metal, and
• a first outer conducting portion allowing conduction to the first metal foil and a second outer conducting portion allowing conduction to the second metal foil are provided on outer surfaces of the packaging member.