Patent ID: 8137835

Claim:
A battery, comprising: an electricity generating element; and a cell can that accommodates the electricity generating element and is closed and sealed, the cell can also serving as a battery terminal of one electrode, the cell can including a steel plate serving as a substrate for plating, one of surfaces of the steel plate to be on an outer side of the cell can being dull finished, another surface of the steel plate to be on an inner side of the cell can being bright finished, the plated steel plating being plated with a plating mainly of nickel, the plated steel plate being pressed into a bottomed cylindrical shape in such a manner that the cell can has a dull finished surface on an outer side thereof and a bright finished surface on an inner side thereof, wherein a center line average roughness of a surface of the plating formed on the dull finished surface is set to 0.6 μm or more, wherein a center line average roughness of a surface of the plating formed on the bright finished surface is set to 0.4 μm or less, and wherein the thickness of the plating on the bright surface is set to 1.5 μm or more.