Patent ID: 8551649

Claim:
A sealed battery, comprising: a case having a case opening portion and a peripheral wall portion surrounding the case opening portion; a lid which closes the case opening portion; an inside protruding portion formed in a face of the lid opposing the case, wherein the inside protruding portion enters into the case and mates with the case opening portion; a welding region between the peripheral wall portion and the lid, wherein the peripheral wall portion and the lid are directly joined to each other by the welding region; and a barrier layer provided in an opposing region between the peripheral wall portion and the lid in which the peripheral wall portion and the lid are in close proximity, and which is at least a region including an inside edge of the peripheral wall portion forming a case opening portion periphery, wherein an edge portion of the barrier layer on the outer side of the case is formed midway in the opening end face of the case peripheral wall portion, between the outside edge and the inside edge, without reaching the outside edge of the peripheral wall portion.