Patent ID: 7060386
Filing Date: 2006-06-13
Classification: H01M,Y02E,Y02P

Abstract:
1. A safety valve for a battery, wherein at least a disk and the safety valve are arranged on one end side of a cylindrical outer packaging can holding an electrode element therein, wherein the disk has a central hole, and wherein a plurality of peripheral holes are located along a circle centering on a symmetrical point of the central hole, and the safety valve comprises: a projecting portion projecting toward the electrode element at the central portion of the safety valve, wherein the projecting portion is connected to a lead of the electrode element through the central hole of the disk, wherein the disk has a linear thin portion, and wherein the safety valve has a plurality of linear thin portions formed almost along at least two circumferences centering on the projection portion; and a small circle having a small diameter and a circle having a large diameter, wherein a plurality of linear thin portions formed along the large diameter circle and a plurality of linear thin portions formed along the small diameter circle are formed almost equal to each other and centering on the projection portion.