Patent ID: 8609269
Filing Date: 2013-12-17
Classification: H01M,Y02E,Y02P

Abstract:
1. A cylindrical secondary cell, comprising: an electrode assembly including a positive electrode, a negative electrode, and a separator wound together; a cylindrical case accommodating the electrode assembly; a cap assembly including a cap-up to be connected to an external device, the cap assembly being coupled with the cylindrical case to be electrically connected to the electrode assembly, said cap-up is bent at two different and separate points of the cap-up forming an edge unit at one of the points of bending ; and an insulating agent covering a surface of the cap-up at one of the points where the cap-up is bent and on said edge unit of the cap-up, the insulating agent at the surface of the cap-up at one of the points being separated from the insulating agent on said edge unit of the cap-up, wherein the edge unit of the cap-up is tightly supported by the cylindrical case with a gasket disposed therebetween, and a protrusion unit protruding outwards in a center region of the cap-up surrounded by the edge unit, and an edge region of the protrusion unit is coated with the insulating agent.