Exterior body and manufacturing method thereof

Abstract

To ensure the welding strength (T-peel strength) of a welded portion.SOLUTION: An exterior body 3 according to the present invention accommodates a content (for example, a power generation element 2). The exterior body 3 includes a welded portion 55 extending in a first direction X. In the welded portion 55, sheet-like bodies (for example, laminate films 3f) that are materials of the exterior body 3 are welded while overlapping each other in a second direction Y orthogonal to the first direction X. The welded portion 55 has, in a cross-sectional view in a third direction Z orthogonal to the first direction X and the second direction Y, a curved portion 58 that is recessed in a curved shape on the side opposite to the content side at the end portion on the content side.SELECTED DRAWING: Figure 2