RECHARGEABLE BATTERY

A rechargeable battery according to an exemplary embodiment of the present invention includes: an electrode assembly formed by spirally winding a first electrode, a separator, and a second electrode; and a pouch that forms a sealing portion by thermally bonding an outer edge of a first external material and an outer edge of a second external material that receive the electrode assembly to withdraw tabs respectively connected to the first electrode and the second electrode to the outside, wherein the electrode assembly includes first curved portions that are convex at opposite sides of a first planar portion in a spiral-wound cross-section, the pouch includes a second planar portion corresponding to the first planar portion, and second curved portions that are connected to the second planar portion corresponding to the first curved portions, and the sealing portion is disposed in spaces, each set by an extension plane set in an extension direction of the first planar portion, external surfaces of the second curved portions, protruding in the extension direction, and a cross plane that is set in a direction crossing the extension direction at the end of the extension direction of the second curved portion.