Patent ID: 8760840

Claim:
An electrochemical device including a charger/discharger housed in an outer package, and a lead extending from the charger/discharger, wherein the lead has: a lead body containing Al; and a metallic thin film which is provided to a tip part of the lead body, and which is bent at a side face position of the lead body as a boundary, and covers upper and lower faces and a side face of the lead body, the metallic thin film having at least one first portion and a second portion, the second portion including the side face of the lead body, the at least one first portion being welded to the lead body and the second portion not being welded to the lead body, the metallic thin film includes: a thin film body containing Ni; and a plating layer containing Sn and covering at least an outer surface of the bent thin film body, and wherein the plating layer not being disposed between the metallic thin film and the lead body.