Patent ID: 6333124
Filing Date: 2001-12-25
Classification: B21D,H01M,Y02E,Y10T

Abstract:
A battery wherein elements for electromotive-force are accommodated in a metal outer can containing, primarily iron, said metal outer can comprising:a metal can having a bottom wall and a side wall defining a sealing aperture opposite said bottom wall, said metal can having a cylindrical or prismatic shape, a ratio of a thickness of said bottom wall of said metal can to a thickness of said side wall of said metal can being from 1.5 to 7.0, said side wall including a first portion extending around a circumference of said metal can adjacent said sealing aperture and a second portion extending around the circumference of said metal can between said first portion and said bottom wall, said first portion of said side wall of said metal can having a uniform thickness at least 10% greater than the thickness of said second portion of said side wall of said metal can; anda layer of nickel arranged on at least an inner face of said side wall, said nickel layer including shallow grooves arranged in a direction perpendicular to said bottom wall of said metal can, wherein said ratio of thickness of said bottom wall to said thickness of said side wall applies to both said first portion of said side wall and said second portion of said side wall, respectively.