The utility model discloses an explosion -proof combined cover cap of battery, including explosion -proof piece, locate raising to the higher plane of principle rather than matched with on the explosion -proof piece is covered, explosion -proof piece is equipped with the district of breaking of circular undercut, raise to the higher plane of principle the lid including annular basal portion, the inboard edge of annular basal portion upwards is equipped with the arch, the inboard edge of annular basal portion is to having a plurality of claw, claw with the marginal facies cooperation butt that breaks and distinguish. The utility model discloses it is rational in infrastructure, ensure that electric core is safe in utilization.