Patent ID: 7862934

Claim:
A battery that includes an electrode assembly including a positive electrode plate and a negative electrode plate layered so as to sandwich a separator, a collector plate being connected to an end part of at least one of the positive electrode plate and the negative electrode plate, wherein the collector plate includes a main body, on one main surface of which one or more convex parts each having a top extending linearly are formed, one or more cutout regions having an elongated shape are formed by partially cutting out each convex part such that a longitudinal direction of each cutout region is in parallel with a longitudinal direction of the top of the corresponding convex part and tips of both ends of each cutout region are in alignment with a longitudinal direction of the top of the corresponding convex part, and each convex part is resistance-welded to the end part of the electrode assembly at a plurality of welding points, with use of an electric current that flows along the one main surface of the main body of the collector plate.