A secondary battery comprising: a body part provided in a pillar shape on an outer wall that surrounds an accommodation space in which an electrode assembly and an electrolyte are accommodated and comprising a passage, through which the electrolyte flows, therein; a pin switch extending in a longitudinal direction of the body part within the body part, wherein, when a pressure is applied to an end of the pin switch, the pin switch linearly moves toward the inside in which the accommodation space is defined, and when the pressure is removed, the pin switch linearly moves toward the outside; a manipulation part coupled to an outer circumferential surface of the body part to move in a direction that is parallel to the linear movement of the pin switch; a pressure apply part protruding from a central portion of the manipulation part to apply a pressure an end of the pin switch according to the movement of the manipulation part; and a switching part disposed on the other end of the pin switch to open the passage when the pin switch linearly moves toward the inside and close the passage when the pin switch linearly moves toward the outside; an elastic part having elasticity and providing a restoring force to the pin switch when the pressure is removed, and being lengthily disposed in a spiral shape according to a pillar of the pin switch; a support coupled to an inner circumferential surface of the body part and comprising the passage therein; and first and second inflow and outflow holes (231, 232) through which the electrolyte is introduced into and discharged from the passage, the first and second inflow and outflow holes (231, 232) being respectively provided in an inner end and an outer end of the support, wherein the manipulation part comprises a third inflow and outflow hole through which the electrolyte is introduced into and discharged from the passage. a body part provided in a pillar shape on an outer wall that surrounds an accommodation space in which an electrode assembly and an electrolyte are accommodated and comprising a passage, through which the electrolyte flows, therein; a pin switch extending in a longitudinal direction of the body part within the body part, wherein, when a pressure is applied to an end of the pin switch, the pin switch linearly moves toward the inside in which the accommodation space is defined, and when the pressure is removed, the pin switch linearly moves toward the outside; a manipulation part coupled to an outer circumferential surface of the body part to move in a direction that is parallel to the linear movement of the pin switch; a pressure apply part protruding from a central portion of the manipulation part to apply a pressure an end of the pin switch according to the movement of the manipulation part; and a switching part disposed on the other end of the pin switch to open the passage when the pin switch linearly moves toward the inside and close the passage when the pin switch linearly moves toward the outside; an elastic part having elasticity and providing a restoring force to the pin switch when the pressure is removed, and being lengthily disposed in a spiral shape according to a pillar of the pin switch; a support coupled to an inner circumferential surface of the body part and comprising the passage therein; and first and second inflow and outflow holes (231, 232) through which the electrolyte is introduced into and discharged from the passage, the first and second inflow and outflow holes (231, 232) being respectively provided in an inner end and an outer end of the support, wherein the manipulation part comprises a third inflow and outflow hole through which the electrolyte is introduced into and discharged from the passage.