Patent ID: 8039146

Claim:
An electrochemical device comprising: a positive electrode comprising a positive electrode active material selected from the group consisting of nickel oxyhydroxide, manganese dioxide, and a mixture of nickel oxyhydroxide and manganese dioxide; a negative electrode comprising a zinc component as a negative electrode active material; a separator interposed between said positive electrode and said negative electrode; an alkaline electrolyte; and a battery case, formed into a battery can shape, for housing said positive electrode, said negative electrode, said separator, and said alkaline electrolyte, wherein: said battery case includes a nickel plated steel plate having a nickel plating layer at least on an inner side surface of the battery case, and at least the inner side surface of the battery case has a surface structure satisfying that an intensity ratio of Fe to Ni (I Fe/Ni ) as determined by electron probe microanalysis is from approximately 0.002 to approximately 0.005.