Patent ID: 7754376
Filing Date: 2010-07-13
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A cylindrical lithium secondary battery comprising: a winding-type electrode assembly including a first electrode plate to which a first electrode tab is attached, a second electrode plate to which a second electrode tab is attached, and a separator interposed between the first electrode plate and the second electrode plate, wherein a space is formed through a central longitudinal axis of the electrode assembly; a cylindrical case adapted to receive and house the electrode assembly, the cylindrical case having a bottom surface; a first insulation plate insulating the electrode assembly from the cylindrical case, the first insulation plate being located adjacent the bottom surface and including a recess adapted to accommodate the first electrode tab so that the first electrode tab is coupled to the cylindrical case; a cap assembly located at an opposite end of the cylindrical case from the bottom surface, the cap assembly being coupled to the second electrode tab and sealing the case; and wherein the bottom surface of the case and a surface of the recess facing the bottom surface maintain substantially a same distance throughout a longitudinal direction of the recess.