Patent ID: 8574750

Claim:
A sealed rectangular battery which comprises: an electrode group having a positive electrode and a negative electrode; and a cell casing for accommodating the electrode group and an electrolyte solution, made up of a rectangular frame member having a pair of openings and first and second lid members electrically connected with said electrode group; wherein the first lid member is made of an electroconductive metallic plate and includes a substantially flat body portion for covering one of the openings of the frame member, and side portions protruding from the body portion substantially along at least one pair of sides of the frame member opposite to each other, each one of the side portions being formed by a single bend of the body portion in a direction towards the second lid member such that each side portion extends substantially parallel over a co-parallel side of the frame member from the bend to the opposite end of the side portion; and wherein the second lid member is made of an electroconductive metallic plate and includes a body portion for covering the other of the openings of the frame member, and side portions protruding from the body portion of the second lid member substantially along at least one pair of sides of the frame member opposite to each other.