Patent ID: 6326100
Filing Date: 2001-12-04
Classification: H01M,Y02E,Y02P

Abstract:
A cylindrical secondary battery comprising:a case;a cathode plate and an anode plate installed in the case and a separator interposed between the cathode and anode plates;a cap disposed on the case and a cap cover coupled to the cap and having a vent hole; anda one-way valve installed in the vent hole, wherein the one-way valve comprises:a hollow body inserted in the vent hole of the cap cover;a plurality of gas passing grooves at an outer circumferential surface of the hollow body;a first flange at the outer circumferential surface of the hollow body disposed on a side of the cap cover opposite the cathode and anode plates;a second flange at the outer circumferential surface of the hollow body disposed between the cap cover and the cathode and anode plates;a spring elastically supported between the first flange and the cap cover; anda fragile portion closing a portion of the hollow body approximate the first flange.