Secondary battery

Abstract

Secondary battery includes: battery electrode assembly that has a quadrangular planar shape, and includes a positive electrode and a negative electrode laminated with a separator interposed therebetween; and an exterior container that is formed of flexible films, and contains battery electrode assembly. The exterior container has recessed emboss portion that contains battery electrode assembly therein. Four corners of an outer peripheral portion of battery electrode assembly are either folded to be contained inside emboss portion, or inserted between flexible films outside emboss portion. A length of at least one side among four sides forming the quadrangular planar shape of battery electrode assembly is shorter than an inner dimension of emboss portion in the direction in which the one side extends.

Dependencies are inferred from the claim text.