Patent ID: 7754372

Claim:
A lithium secondary battery comprising: an electrode assembly comprising a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate; a can housing the electrode assembly and an electrolyte; and a cap assembly coupled to an upper opening of the can to seal the can, the cap assembly including a cap plate, an insulation plate coupled to a can interior-facing surface of the cap plate, a terminal plate coupled to a can interior-facing surface of the insulation plate, and an electrode terminal inserted through the cap plate, the insulation plate and the terminal plate and electrically coupled to the electrode assembly, wherein the cap plate includes a fracturable safety vent, wherein the insulation plate electrically insulates the terminal plate from the cap plate; and wherein the insulation plate has an insulation plate vent-hole passing through the insulation plate at a portion corresponding to the safety vent.