Patent ID: 8785037
Filing Date: 2014-07-22
Classification: H01M,Y02E

Abstract:
1. A secondary battery comprising: an electrode assembly comprising a first electrode plate, a second electrode plate, and a separator located between the first electrode plate and the second electrode plate; a first collecting plate and a second collecting plate that are electrically connected to the first electrode plate and the second electrode plate, respectively; a case configured to accommodate the electrode assembly, the first collecting plate, and the second collecting plate; a plurality of electrode terminals; a cap plate sealing the case such that the electrode terminals protrude through the cap plate, and the cap plate being a single integral plate having a first surface facing away from the electrode assembly and a second surface opposite the first surface and facing towards the electrode assembly, wherein the cap plate has lateral regions encompassing each of the electrode terminals and extending to an edge of the cap plate and a center region between the lateral regions, the cap plate having reinforcement stepped parts on the lateral regions such that a thickness between the first surface and the second surface of an entirety of the lateral regions is greater than a thickness between the first surface and the second surface of an entirety of the center region; and a sealing gasket directly contacting the case, the cap plate, and one of the electrode terminals.