Secondary battery

An embodiment of the present invention relates to a secondary battery and addresses the technical problem of providing a secondary battery capable of improving structural stability. To this end, the present invention provides a secondary battery comprising: an electrode assembly which comprises a first electrode plate having a first electrode-uncoated portion along an upper end thereof, a second electrode plate having a second electrode-uncoated portion along a lower end thereof, and a separator interposed between the first electrode plate and the second electrode plate, wherein at least one among the first electrode-uncoated portion and the second electrode-uncoated portion includes a reinforcing portion for reinforcing verticality; a can for accommodating the electrode assembly; a cap assembly for sealing the can; a first current collector plate coupled to an upper end of the first electrode-uncoated portion and electrically connected to the cap assembly; and a second current collector plate coupled to a lower end of the second electrode-uncoated portion and electrically connected to the can.