Safety valve for lithium ion cell

This invention discloses a safety valve mounted on the orifice of the Li ionic battery shell including a battery top cover with a seat at the middle sealed-in with the cover. A central hole is set on the seat, and the diameter of the upper section is greater than that of the lower to form circle stage at the middle, a valve plug, a spring and a wafer are set in the central hole from the bottom to the top on the circle stage. A central hole is on the wafer, its edge is sealed-in with the central orifice of the valve seat, a rubber film is on the wafer, its surrounding is sealed-in with the wafer, a cover with an air gate at the center is set on the rubber film and downward center is set at the air gate, the peak of the center is in a gap with the film.