Patent ID: 7384705

Claim:
A battery contained in a laminate sheet having an electrode comprising: a plurality of electrode sheets, each electrode sheet having a collector, an active material layer formed on said collector, and a lead connecting portion which is configured as an exposed extension of said collector, on both surfaces of which said active material layer is not formed; a lead; and a plurality of metal pieces, wherein, the lead connecting portions, the lead and the metal pieces are positioned in a stacked and overlapped relationship, and at least one of the lead connecting portions is sandwiched between a couple of adjacent metal pieces, the collectors and the lead are formed of metal foil, and each of the metal pieces is ultrasonically welded to at least one of the lead connecting portions and the lead, an area of one principal plane of each of the metal pieces is less than a contact area between the lead and the lead connecting portion, and each of the metal pieces is positioned in a stack to overlap the contact area.