Patent ID: 7501197
Filing Date: 2009-03-10
Classification: H01M,Y02E

Abstract:
1. A cap assembly for a secondary battery, comprising: a cap plate having a terminal; a vent plate having a vent, the vent plate having a shape being able to alter when an internal pressure of the secondary battery is higher than a prescribed level; and a current breaker electrically connected to the cap plate and the vent plate, wherein the current breaker has an arc-shaped member having a concave portion with a predetermined curvature, wherein both ends of the current breaker have a bend portion to contact the cap plate, the current breaker altering its shape when the shape of the vent plate alters, the alteration of the shape of the current breaker electrically disconnecting the current breaker bent portion contacted with the cap plate from the cap plate to cut off a current path of the cap assembly.