Patent ID: 6649301
Filing Date: 2003-11-18
Classification: H01M,Y02E

Abstract:
A sealed battery comprising:a can for receiving an electrical generator; a shape-variable plate being deformed in a direction where an internal pressure is applied and crimped on an opening of the can; a gasket disposed between the can and the shape-variable plate; a fixing plate having at least one air flow hole, and disposed under the shape-variable plate wherein an inner diameter of the gasket is less than an outer diameter of the fixing plate; an insulating member disposed between the shape-variable plate and the fixing plate; and a projection comprising a connection portion and a weld contact portion, the connection portion extending from the fixing plate to the weld contact portion, the weld contact portion having a uniform thickness being welded to the shape-variable plate, the projection being provided with a mechanically weak portion which is designed to be broken at an internal pressure lower than that for separating a welding portion of the projection and the shape-variable plate, wherein the mechanically weak portion consists of the weld contact portion.