Patent ID: 8557433

Claim:
A secondary battery comprising: an electrode assembly including a first electrode plate, a second electrode plate, and a separator disposed between the first and the second electrode plates; a can accommodating the electrode assembly, the can having a top opening on a top surface of the can; and a cap assembly covering the top opening of the can, the cap assembly including: a cap plate electrically connected to a first electrode tab protruding from the first electrode plate; an insulation plate located under the cap plate; a terminal plate located under the insulation plate; an electrode terminal penetrating the cap plate, the insulation plate, and the terminal plate and electrically connected to a second electrode tab protruding from the second electrode plate; and a short-circuit plate located under the cap plate within the can and surrounded by the electrode assembly, the can and the cap plate, the short-circuit plate being disposed in a manner that the short-circuit plate contacts the terminal plate or the second electrode tab whenever a distorting pressure is applied to the secondary battery.