Abstract: A battery including a case defining a cavity for housing an electrode assembly, the case having an opening for receiving the electrode assembly, and a cap plate attached to the case to cover the opening, the cap plate including a welded portion that is thicker than a major area of the cap plate.

Abstract: A battery including a battery case, an electrode assembly disposed in the battery case, the electrode assembly including a winding of a first electrode plate, a second electrode plate and a separator, wherein the separator is interposed between the first and second electrode plates, a cap assembly covering the battery case, and a member configured to prevent a short circuit of the electrode assembly.

Abstract: A lithium secondary battery having a cap assembly including a cap plate, an insulation plate and a terminal plate. The insulation plate and the terminal plate each have a predetermined vent hole corresponding to a safety vent formed on the cap plate so that if the secondary battery is dropped, an electrolyte passes through the vent-holes and undergoes a pressure reduction, thereby preventing fracture of a safety vent by the electrolyte while allowing gas to be exhausted upon battery overcharge, full discharge or by overheating.

Abstract: A can includes a body receiving an electrode assembly of a battery and a bottom wall protruding downward from the body and having a convex bottom surface such that the bottom wall does not bend toward an inner portion of the can when the body is compressed.

Abstract: A can type secondary battery. The can type secondary battery has a fixing unit for fixing an end portion of a terminal plate to an end portion of an insulation plate of a cap assembly in order to prevent a short circuit between the terminal plate and an electrode assembly by preventing the terminal plate from being deformed due to external force or external pressure applied to the can type secondary battery, thereby improving safety of the secondary battery.