Patent ID: 8663835
Filing Date: 2014-03-04
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A secondary battery, comprising: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator disposed between the both electrode plates; a can accommodating the electrode assembly; and a cap assembly including an electrode terminal, a cap plate having a terminal through-hole and a planar upper surface, and a gasket disposed on the planar upper surface of the cap plate between the electrode terminal and the cap plate, and sealing the can, wherein a distance between an outermost edge of the gasket and an outermost edge of the cap plate is 0.7 times or greater than a diameter of a laser beam used in a sealing process of the can and the planar upper surface of the cap plate extends between the outermost edge of the gasket and the can.