Closure device for battery container that accommodates lithium ion battery for e.g. electrical motor car, has lid closing aperture, and edge areas releasing aperture in convex state and engaging behind aperture edges in concave state

摘要

The device has a lid (7) closing an aperture (6) and releasing the aperture during defined inner pressure fluctuation. The lid comprises edge areas projected into the aperture and is formed as a spring indentation in a middle area. The lid is converted from a convex state into a concave state. The edge areas release the aperture in the convex state and engage behind aperture edges of the container in the concave state. An annular seal is arranged at the edge areas and seals the aperture edges in a tight manner. The lid is made of steel, light metal or plastic.