a cap assembly for a battery and a battery incorporating the cap assembly . the cap assembly includes a plate that connects the electrodes of the bare cell of the battery . the cap assembly includes a vent member that includes a protrusion that is physically connected to the plate . excess pressure within the bare cell results in the protrusion disconnecting from the plate thereby interrupting current . the vent further includes two circular notches , an inner notch and an outer notch . the vent further includes a cross notch that extends radially outward so as to intersect and extend beyond both the first and second notches . the notches are configured to release when the pressure within the bare cell exceeds a burst pressure .