A secondary battery includes an electrode assembly having a first electrode plate with a first electrode non-coated portion, the first electrode non-coated portion including a first protrusion part at an upper part of the electrode assembly, a second electrode plate with a second electrode non-coated portion, the second electrode non-coated portion including a second protrusion part at an upper part of the electrode assembly, and a separator disposed between the first and second electrode plates, first and second current collecting plates electrically connected to respective first and second electrode plates, and a case accommodating the electrode assembly and the first and second current collecting plates, the case having a shape corresponding to the first and second protrusion parts of the electrode assembly.