Patent ID: 7550225
Filing Date: 2009-06-23
Classification: H01M,Y02E,Y02P

Abstract:
1. A battery comprising: a battery element including a cathode and an anode; a safety valve electrically connected to said battery element said safety valve having a support plate; an insulating plate arranged between said battery element and said safety valve; an inversion plate on said support plate; an insulating member between said inversion plate and said support plate; an opening in a central portion of said support plate; a contact plate on said central portion at a side opposite of said inversion plate and welded to a lead to form an electrical connection to said battery element; a plurality of vent holes to transmit a change in the internal pressure of a battery container to said inversion plate around said central portion of said support plate; and a protrusion which protrudes from said central portion to said battery element side inserted in said opening of the support plate and in contact with said contact plate, wherein,