A secondary battery includes an electrode assembly including a first uncoated portion extending in a first direction, and a second uncoated portion extending in a second direction opposite to the first direction; a case accommodating the electrode assembly; a first terminal extending to an outside of the case and being connected to the first uncoated portion; a first cover plate coupled to the first terminal and closing the case in the first direction, the first terminal being insulated from the case; a connection plate connected between the second uncoated portion and the case; and a second cover plate covering the connection plate and closing the case in the second direction.