Battery, and Battery Pack and Vehicle Including the Same

A battery according to an embodiment of the present disclosure may include an electrode assembly; a battery housing configured to accommodate the electrode assembly through an opening formed on one side; a cap configured to cover the opening of the battery housing; and a gasket interposed between the cap and the inner surface of the battery housing and at least partially compressed, and having a protrusion on a surface facing the cap that protrudes in a direction toward the cap based on a state before being compressed.