BATTERY CELL

The present disclosure relates to a battery cell including: a case for receiving an electrode assembly; a terminal portion electrically connected to the electrode assembly and protruding in a predetermined protrusion direction toward one surface of the case; a through-hole penetrating the one surface of the case; a protrusion portion extending in the protrusion direction from a periphery of the through-hole, including an opening hole at one end, and connecting an inside and an outside of the case through the opening hole and the through-hole; and a cover portion detachably coupled to the protrusion portion to cover the through-hole.