Explosion-proof equipment of lithium ion battery combined nut cap

The utility model discloses explosion-proof equipment of a lithium ion battery combined nut cap. The marginal parts of an explosion-proof sheet, an inner connecting sheet and an upper connecting sheet of the explosion-proof equipment are tightly jointed together; the tightly jointed section is coated in a U shape by a U-shaped air cushion spacing ring; a cup-shaped pressure plate coats the U-shaped air cushion spacing ring, the explosion-proof sheet, the inner connecting sheet and the upper connecting sheet in the U shape; isolated insulation is mostly carried out between the cup-shaped pressure plate and the explosion-proof sheet arranged on the cup-shaped pressure plate through the U-shaped air cushion spacing ring; and an explosion-proof film and the cup-shaped pressure plate contact through welding spots. The explosion-proof film, the inner connecting sheet, and a sealing ring and the spacing ring between the upper connecting sheet and the cup-shaped pressure plate are installed into a whole, and the expl