Patent ID: 7901807

Claim:
An energy device comprising a winding body in which a band-shaped laminate having a flexible elongated substrate, a negative collector, a negative active material, a solid electrolyte, a positive active material, and a positive collector in this order is wound in a plate shape with the flexible elongated substrate placed inside, wherein a cross-sectional shape of the winding body perpendicular to a winding axis includes portions at opposing ends of the cross-sectional shape with small radiuses of curvature and portions between the opposing ends of the cross-sectional shape with large radiuses of curvature, wherein the flexible elongated substrate is made of an insulating material, wherein in the band-shaped laminate, adjacent layers of the flexible elongated substrate, the negative collector, the negative active material, the solid electrolyte, the positive active material, and the positive collector respectively are in direct contact with each other, and wherein the negative collector, the negative active material, the solid electrolyte, the positive active material, and the positive collector are formed on the flexible elongated substrate by a vacuum film-forming apparatus.