Patent ID: 7314492

Claim:
A method for manufacturing an alkaline battery in which silver oxide or manganese dioxide is a positive active material, zinc or zinc alloy powder without containing mercury is a negative active material, a separator and a gasket are provided between positive electrode mixture and negative electrode mixture, the inside surface of a negative electrode cup having alkaline electrolyte injected is coated with metal or metal alloy having a higher hydrogen overpotential than copper, and said coating process is performed by means of a PVD method such as deposition, sputtering, ion plating or the like, wherein said coating is provided using a mask having the shape that satisfies: 2(2t+d)−B≧A≧0.7d, where d is the inside diameter of the negative electrode cup, t is the plate thickness of the negative electrode cup, A is the diameter of the mask opening on the negative electrode cup mounting side, B is the diameter of the mask opening on the negative electrode cup supplying side and, the position of the negative electrode cup is shifted on a cup mounting surface toward a side wall of the mask opening on the mounting side of the negative electrode cup, a cuff bottom portion of the negative electrode cup is not exposed to the inside of the mask opening on the negative electrode cup mounting side, so that only the inside surface area of the negative electrode cup other than the cuff portion and cuff bottom portion is coated.