BATERAI DAN METODE PEMBUATANNYA

摘要

A battery has elements for electromotive-force accommodated in a metal outer can (1), the metal outer can (1) being a metal can (4) with a bottom having a cylindrical shape and a bottom thickness (TA)/side thickness (TB) value of 2.5 &tilde& 5.0. The metal outer can (1) consists chiefly of iron and a nickel layer (8) is provided on at least the inner face of the battery. A multiplicity of shallow grooves (7) perpendicular to the bottom face are formed on the surface of the nickel layer (8). In the method, an iron-based metallic sheet formed with a nickel layer (8) on at least one face is subjected to drawing forming into a tubular shape having a bottom. Continuous ironing processing is performed such that the side of the can formed in the tubular shape has an ironing ratio in the range 20 &tilde& 90% and a metal outer can (1) is thereby manufactured having a bottom thickness (TA)/side thickness (TB) value of 2.5 &tilde& 5.0, having a cylindrical shape. A multiplicity of shallow longitudinal grooves are formed in the nickel layer (8) provided on the battery inside face.