Patent ID: 6203937
Filing Date: 2001-03-20
Classification: H01M,Y02E,Y10T

Abstract:
A battery having a fill port with a hermetic seal, the hermetic seal comprising in combination a container having a cylindrical passageway defined by a wall made from a material selected from the group consisting of 1/4 hard stainless steel and annealed stainless steel, a smooth, rigid ball of slightly larger diameter than that of the passageway, the smooth ball having a surface finish of less than about 5 micro inches, the ball having a hardness of greater than about 55R.sub.c provided by a material selected from the group consisting of a transition metal carbide and an iron base alloy hardened by martensitic phase transformation, the ball being press fit into the passageway causing the passageway metal to flow about the ball forming a seal therewith.