BATTERY MODULE

Disclosed is a battery module. The battery module according to an embodiment of the present disclosure includes a case which has an opening on a front side and provides an internal space; a battery cell disposed in the internal space; and a gas valve including a seating portion which is installed in the opening and has an outlet and a cover which is movable in a front-rear direction and opens and closes the outlet, wherein the cover includes a first part of which diameter increases in a direction facing away from the outlet.