A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case having an opened upper end; a cap plate to seal the upper end of the case; a first electrode terminal on the cap plate,...

The present invention provides a battery pack comprising at least one battery unit; and a controller for controlling the operation of the at least one battery unit (1S, 2S, 3S). The at least one battery unit comprises: a cell unit comprising a plurality of...