ELECTRICITY ACCUMULATION DEVICE FABRICATION METHOD AND ELECTRICITY ACCUMULATION DEVICE

摘要

A metal foil which extends from an electrode plate which is overlapped in a layered state is sandwiched by a first metal member and a second metal member. The metal foil, the first metal member, and the second metal member are bonded together by working ultrasound wave oscillation upon a plurality of work locations from the first metal member side. The Vickers hardness of the first metal member is set to 40Hv-75Hv.