SECONDARY BATTERY

An embodiment of the present invention relates to a secondary battery, and the problem to be solved by the present invention is to provide a secondary battery in which output is improved by minimizing component resistance or internal resistance, and in which material costs may be reduced. To this end, disclosed is a secondary battery comprising: a cylindrical can having an opening; an electrode assembly accommodated in the opening of the cylindrical can and wound in a cylindrical form; a current collector plate electrically connected to the electrode assembly; and a safety vent electrically connected to the current collector plate and sealing the opening of the cylindrical can.