Patent ID: 6908703

Claim:
A sealed battery, comprising: an outer can having an opening end and functioning also as an electrode terminal; a sealing member fitted in the opening end of the outer can and functioning also as an electrode terminal which is different in polarity from the outer can; and a spiral-wound electrode assembly contained in the outer can, the spiral-wound electrode assembly including a first electrode, a second electrode and a separator wound together spirally, the separator separating the first electrode from the second electrode and having an outermost coil which forms an outer circumferential face of the spiral-wound electrode assembly and is adjacent to a part of the first electrode, wherein the first electrode includes a substrate and an active material carried on the substrate, the substrate having an exposed portion which projects in an axial direction of the spiral-wound electrode assembly beyond the outermost coil of the separator and a protrusion, the protrusion protruding from the exposed portion outward in a radial direction of the spiral-wound electrode assembly and directly contacting an inner circumferential face of the outer can.