Device and method for recovering dichloromethane in production process of lithium battery diaphragm

The invention discloses a dichloromethane recovery device and method in a lithium battery diaphragm production process, and belongs to the technical field of lithium battery diaphragm production. The device comprises a box body and a fan arranged at an inlet of the box body, a condenser and a heater are arranged in the box body, and a liquid collecting tank is arranged at the bottom of the box body; wherein a plurality of groups of condensers are arranged along the circulation direction of dichloromethane, and baffles are arranged between the adjacent condensers and are sequentially arranged in an up-and-down staggered manner; and a wire mesh demister is arranged above the liquid collecting tank. According to the dichloromethane recovery device, dichloromethane discharged from the drying box flows into the liquid collecting tank after being condensed by the condenser, and uncondensed dichloromethane returns to the drying box after being heated by the heater, so that the concentration of the dichloromethane is