Patent ID: 7972723
Filing Date: 2011-07-05
Classification: H01M

Abstract:
1. A flat alkaline primary battery, comprising: a positive electrode can having an annular end portion; and a negative electrode can having an annular end portion, wherein the annular end portion of the negative electrode can is engaged with the annular end portion of the positive electrode can so that the positive electrode can and the negative electrode can are connected via a gasket to create an enclosed space inside the cans, wherein the enclosed space accommodates a separator, a positive electrode mixture having a positive electrode active material as a main component on the positive electrode can side, and a negative electrode mixture having a negative electrode active material as a main component on the negative electrode can side, the enclosed space being filled with an alkaline electrolyte; wherein the positive electrode active material is oxy nickel hydroxide powder, the negative electrode active material is a zinc or zinc alloy powder, and the mass of the oxy nickel hydroxide powder is between 3.9 and 4.4 times, inclusive, the mass of the zinc or the zinc alloy; wherein the battery has flat discharge voltage of 1.55 V to 1.80 V.