Patent ID: 7335442

Claim:
A battery comprising an electrode unit comprising a negative electrode and positive electrode spirally wound around an axis of the electrode unit as an electricity generating element housed in a battery can, and a pair of negative and positive electrode terminal assemblies for taking the electricity out of the battery, wherein one of said negative and positive electrode terminal assemblies is secured to a lid of the battery, a current collector plate is connected to an edge of an electrode at one end of the electrode unit to electrically connect the electrode unit to said one of said negative and positive electrode terminal assemblies, said current collector plate having one or more than one connecting piece, which is protrusively formed on a surface of the current collector plate and extends in the direction of the axis of the electrode unit on a side of said current collector plate not connected to said edge of an electrode, which one or more than one connecting piece is welded to a flange portion of a base portion of said one of said negative and positive electrode terminal assemblies, said flange portion extending from said base portion in the direction of the axis of the electrode unit on a side of the base portion facing the current collector, to form a welded surface between said one or more than one connecting piece and said flange portion of the base portion extending in the direction of the axis of the electrode unit.