US Patent 7960055 Secondary battery

A secondary battery including an electrode assembly having a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode and a can housing the electrode assembly, the can having an opening on one end. The secondary battery further includes a cap assembly having a cap plate having a terminal hole, the cap plate coupled to the opening of the can, an electrode terminal inserted through the terminal hole, and a terminal plate coupled with an interior end of the electrode terminal. The terminal plate has a placement recess located on an interior-facing surface, the placement recess preventing the interior end of the electrode terminal from protruding past the interior-facing surface of the terminal plate.