Secondary Battery and Method for Manufacturing The Same

A secondary battery includes an electrode assembly, a can, and a cap assembly covering an opening of the can. The cap assembly has a top cap, a safety vent, and a current interrupt device (CID). The top cap provides an outermost terminal for an electrical connection. The safety vent is disposed below the top cap. The safety vent is disposed inside the top cap and is configured to change when an internal pressure of the can increases to a critical value or more. The current interrupt device (CID) is disposed below the safety vent. A recess is provided in one of the safety vent or the current interrupt device (CID), and a protrusion in a shape conforming to the recess is provided on the other. The recess and the protrusion are configured to be press-fitted to each other. A method of manufacturing the same is also provided.