Emergency degassing unit for degassing battery housing and battery housing

An emergency degassing unit for degassing a battery housing, the emergency degassing unit comprising:

• a base body comprising a front side and an opposing rear side along an axial direction, the base body further comprising a circumferentially extending rim surrounding a passageway for degassing, and the rear side of the base body being configured to be mounted to a degassing opening of the battery housing;
• and
• a valve unit comprising a flexible valve keeper and a closure element, the valve keeper surrounding the closure element in a closed position of the closure element, the valve keeper being mounted with a mechanical preload force in the axial direction to the base body, the closure element being configured to be in the closed position if a force acting on the closure element that is generated by a pressure in the battery housing is lower than the preload force of the valve keeper, and the closure element being configured to be in an open position if the force acting on the closure element generated by the pressure in the battery housing exceeds the preload force of the valve keeper;
• and
• a protective cover arranged in the axial direction beyond the closure element and configured to limit a movement of the valve keeper in the axial direction when the closure element is in the open position.