| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery can that is easy in laser-sealing, can prevent the reduction of pressure-resistant strength of the plug port and can achieve thinning and weight reduction of the can, and to provide a battery that can improve mass-energy density and weight-energy density. SOLUTION: This battery can is formed in a cylindrical shape with a bottom, and its has a two-layer structure in which the materials excluding that used for the circumference of the plug port of the battery can are different metals or alloys. The material of the plug-port circumference is either one of the materials for the two-layer structure excluding the plug-port circumference. The battery can is formed so that the ratio of bottom thickness/flank- circumference thickness may be 1.2 to 5.0. In this way, laser plugging becomes easier, reduction of pressure-resistant strength of the plug port can be prevented, thinning and weight reduction of the battery can may be achieved, and mass- energy density and weight-energy density of the battery can be improved. |
