The present application relates to a battery pack case and a battery pack, the battery pack case includes: a case body including an accommodating chamber and a side wall provided with a maintenance port communicating with the accommodating chamber; a cover plate assembly, detachably connected to an outer surface of the side wall, being capable of opening or closing the maintenance port and including a cover plate and an outer gasket stacked with each other. The cover plate includes a first concave portion recessed in a thickness direction of the cover plate and a first limiting portion surrounding an outer periphery of the first concave portion, and abuts against the outer surface by the first limiting portion to form a first receiving chamber, the outer gasket is disposed in the first receiving chamber and is closely contact with the first concave portion and the outer surface.