Patent ID: 7829217

Claim:
A zinc can for battery anode having a covered bottom and cylindrical shape, and made from a metallic composition comprising: 98.7 percent by mass to 99.8 percent by mass of zinc, 0.01 percent by mass or more and 0.7 percent by mass or less of bismuth, 1 ppm or less of antimony, 70 ppm or less of lead, and 20 ppm or less of cadmium; wherein said zinc can has a metal structure in a cross section of said can wall being cut in the direction of height and thickness which consists of crystals having an average grain diameter of 8 μm or more and 25 μm or less as measured on a projected image of said crystals on a horizontal line in a thick direction of the can which average grain diameter is computed out; wherein said zinc can is formed by pressing at a temperature in the range of 120-180° C.; and wherein the crystals have an O/I ratio ranging from 1.0 to 1.4, where O represents an average grain diameter of the crystals existing vertically epitaxial to the height direction on a cross section being cut in the height and the thickness direction in a range of 200 μm from the outer surface of the can wall and I represents the average grain diameter of the crystals existing in a cross section within 200 μm from the inner surface, being said diameters measured on a projected image of the crystals on a horizontal line in the thickness direction, which average value for O and I being computed out.