Patent ID: 6258480
Filing Date: 2001-07-10
Classification: H01M,Y02E,Y10T

Abstract:
A battery comprising:elements for electromotive-force;a metal case which has a bottom and a side wall extending to a top edge defining a sealing aperture, said elements for electromotive-force being disposed in said metal case;said bottom having a bottom thickness and said side wall having a side thickness wherein a ratio of said bottom thickness to said side thickness is in the range of 1.2-4.0; andsaid metal case being formed of one of a metal material which is comprised substantially of aluminum and an alloy material which is comprised substantially of aluminum, wherein a Vickers hardness value of said side wall formation of said metal case has a value at least 1.2 times a Vickers hardness value of the metal material or the alloy material prior to formation into said case.