Patent ID: 8580425

Claim:
A secondary battery, comprising: an electrode assembly; a can housing the electrode assembly; and a cap assembly on the can, wherein: the cap assembly includes: a cap plate having a terminal hole and a terminal groove having at least one side that extends from the bottom of the terminal groove; a gasket on the cap plate having a center hole; and an electrode terminal having a terminal post in the center hole and a plate portion disposed on the gasket and having at least one side; the gasket including: a gasket post in the terminal hole, and a gasket plate seated in the terminal groove, the gasket plate having a flat upper part and at least one side; and at least one side of the plate portion of the electrode terminal and at least one side of the gasket plate being spaced apart from the at least one side of the terminal groove; wherein: the plate portion, the gasket plate and the terminal groove each have a first side, and the first side of the plate portion and the first side of the gasket plate are spaced apart from the first side of the terminal groove; and a distance between the first side of the plate portion and the first side of the terminal groove is about the same as a distance between the first side of the gasket plate and the first side of the terminal groove.