| 摘要 |
An electrochemical device which can keep a conductive lid properly joined to a rigid case is provided. A conductive lid 12 has a reinforcement part RP inside of a ring-shaped welded part PP. The welded part PP of the conductive lid 12 and the welded frame member 11d of a rigid case 11 are joined to each other by welding. Even if stress of risen internal pressure due to reflow soldering or the like concentrates at the interface between the rigid case 11 and the conductive lid 12, the reinforcement part RP relieves the stress.
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