| 摘要 |
A sealed battery provided by this invention has a case (10) having an opening portion, and a lid (60) which closes the case opening portion. An inside protruding portion which enters into the case and mates with the case opening portion is formed in the face of the lid opposing the case, and a case peripheral wall portion (14) surrounding the opening portion and the lid are joined by welding. And, in a region in which the case peripheral wall portion and the lid are in close proximity, and which is at least a region including the inside edge (16) of the peripheral wall portion forming the case opening portion periphery, a barrier layer (70) is provided which impedes direct contact between the peripheral wall portion and the lid, and moreover, the edge portion of the barrier layer on the outer side of the case is formed midway in the opening end face (15) of the case peripheral wall portion, between the outside edge and the inside edge, without reaching the outside edge (18) of the peripheral wall portion.
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