Battery
To suppress formation of wrinkles at any corner of a joint portion of an exterior body to suppress the breakage of the exterior body, a battery includes: an electrode body that is a quadrilateral in a plan view; and an exterior body housing the electrode body therein, wherein the exterior body has a joint portion along at least three sides thereof in a circumferential end thereof, a spacer is arranged between each corner of the electrode body and an inner surface of the exterior body, and the spacer has a projection extending toward the joint portion of the exterior body.
1 . A battery comprising:
an electrode body that is a quadrilateral in a plan view; and
an exterior body housing the electrode body therein, wherein
the exterior body has a joint portion along at least three sides thereof in a circumferential end thereof, and a depression housing the electrode body and a plurality of spacers,
the spacers are arranged separately between each corner of the electrode body and an inner surface of the exterior body,
each spacer has two side faces fitting each corner on an inner surface of the depression of the exterior body in a plan view, and edge formed by the side faces, and a projection projecting from the edge toward the joint portion of the exterior body, and
the projection is formed so that a width thereof is tapered to a tip thereof in the plan view, and has a largest projecting amount toward the joint portion in a direction along a line by which an area of the spacer is divided in half, the line including an apex of the projection in the plan view.
2 . The battery according to claim 1 , wherein the projection is formed so as to be tapered to a tip thereof.
3 . The battery according to claim 1 , wherein the projection has a face inclining toward the joint portion in a thickness direction of the electrode body.
4 . The battery according to claim 1 , wherein the projection has a concave surface.