STEEL PLATE FOR FORMING BATTERY CAN, BATTERY CAN, MANUFACTURING METHOD OF BATTERY CAN AND BATTERY

摘要

PROBLEM TO BE SOLVED: To improve the battery performance by increasing the surface roughness of an inner surface of a battery can in the axial direction of the can. SOLUTION: A steel plate for forming the bottomed cylindrical battery can by pressing contains coarse grains of the grain size of >=30μm, the volumetric ratio of the coarse grains is >=5%, and the mean grain size is <=150μm. A layer consisting mainly of coarse grains with mean grain size of 30μm to 150μm is provided on at least one surface layer part of the steel plate, and portions other than the layer consists of grains of the grain size of <30μm.