SECONDARY BATTERY

The present invention relates to a secondary battery. The secondary battery according to the present invention comprises an electrode assembly, in which electrodes and separators are alternately stacked, a battery case, in which an accommodation part accommodating the electrode assembly is formed, and a sealing part is formed along an outer circumferential surface thereof, a connection pipe having one side connected to the accommodation part of the battery case and the other side connected to the outside of the battery case and passing through the battery case, and an aroma valve connected to the other side of the connection pipe 140 and disposed outside the battery case so as to be opened to discharge an internal gas when an internal pressure of the battery case is greater than or equal to a predetermined pressure.