Patent ID: 8409736
Filing Date: 2013-04-02
Classification: H01M,Y02E

Abstract:
1. A cap assembly for a lithium ion battery, comprising: an insulating gasket defining a through hole therein; a rupture plate positioned in the through hole; a vent plate defining an air hole electrically connected to the rupture plate; a current interrupt device disposed on the rupture plate; and an end cap including an air exhaust hole disposed on the current interrupt device; wherein the current interrupt device includes an insulating plate, an upper conductive plate disposed against an upper surface of the insulating plate and electrically connected to the end cap, and a lower conductive plate disposed against a lower surface of the insulating plate and electrically connected to the rupture plate; the insulating plate includes a plurality of through holes, the upper conductive plate and the lower conductive plate each includes a plurality of punching holes corresponding to the through holes; a sidewall around each punching hole of the upper conductive plate inserted into the through hole and a sidewall around each punching hole of the lower conductive plate inserted into the through hole are configured to be electrically connected to each other via a fuse in the through hole; the fuse is configured to melt when a current intensity between the upper conductive plate and the lower conductive plate exceeds a predetermined value.