Patent ID: 7474520

Claim:
A storage device comprising: long sheets of collector foils; a first electrode and a second electrode, each comprising a long electrode layer formed on at least one surface of a long sheet of collector foil, leaving a strip part along a long side of the long sheet of collector foil; long separators placed between the first electrode and the second electrode; a first external terminal and a second external terminal electrically connected to the first electrode and the second electrode, respectively, for collecting a current; an electrolyte; a metal case for accommodating the first electrode, the second electrode, the separators, and the electrolyte and for functioning as the second external terminal; and a sealing plate including the first external terminal, for sealing the metal case; wherein the first electrode and the second electrode are wound, with the separators placed therebetween, to form a pillar-shaped element; the strip part of the first electrode and the strip part of the second electrode are disposed to protrude from opposite sides of the separators; the first external terminal is held on the sealing plate; the sealing plate or the metal case has a plate-shaped busbar welded thereto, a part of the busbar having a projecting part protruding from the sealing plate; and the projecting part has a terminal hole formed therein so as to have substantially the same shape as a bottom surface of the first external terminal.