Pass-through connector for a battery pack, battery pack, and method for introducing at least one gas in a hermetically sealable casing for a battery pack

A method for introducing at least one gas in a hermetically sealable casing for a battery pack, comprising:

• loosening a pass-through connector fastened to the casing and extending through the casing, the pass-through connector having a gasket disposed between a flange of the pass-through connector and an inner surface of the casing, the gasket surrounding an aperture of the casing through which the pass-through connector is inserted, loosening the pass-through connector permitting a passage of gas between the gasket and the inner surface of the casing;
• after loosening the pass-through connector, removing gas contained in the casing via a recess defined by the pass-through connector and disposed externally of the casing, the gas being removed flowing sequentially from the casing, past the gasket and through the recess;
• after removing gas contained in the casing, introducing the at least one gas in the casing via the recess, the at least one gas being introduced flowing sequentially through the recess, past the gasket and into the casing;
• and
• after introducing the at least one gas, tightening the pass-through connector to resiliently compress the gasket between the flange and the inner surface of the casing to form a hermetic seal preventing the passage of gas through the aperture in the casing and through the recess in the pass-through connector.