| 摘要 |
PURPOSE:To prevent any voltage deterioration and capacity reduction of a cylindrical alkaline battery during preservation by preventing any self consumption of an active material which might be caused by the formation of a local battery, even when a separator direcly touches the annular groove of a positive case, by forming a clad plate into said positive case in such a manner that a nickel layer forms the inner wall of said case so as to prevent any exposure of an elemental metal. CONSTITUTION:A cylindrical positive case 4 is formed by the use of a clad plate at least one surface of which consists of a nickel layer with 10-100mum thickness. The clad plate is formed in such a manner that the nickel layer necessarily forms the inner surface of the positive case 4, so that the surface of an annular groove 4' touching a separator 6 consists of the nickel layer. As an element metal (mother material) for the clad plate, iron or a stainless steel is used. In a battery thus constituted, the mother material is not exposed entirely even when the annular groove 4' is formed, and there is no possibility that zinc migrating from a negative electrode reaches the annular groove 4' after penetrating the separator 6 even after long-period preservation. |
