BATTERY CELL AND BATTERY MODULE INCLUDING THE SAME

A battery cell includes an electrode assembly comprising a positive electrode and a negative electrode, a case accommodating the electrode assembly, the case having an open portion in one surface thereof, a cap plate part covering the open portion, the cap plate part being coupled to the case, a vent part on the cap plate part, the vent part having a gas flow path depending on an internal pressure of the case, and an opening/closing part on one surface of the case and facing the vent part, the opening/closing part configured to open and close the gas flow path.