NOVELTY - Halogen-free flame retardant battery shell material comprises 73-82 wt.% acrylonitrile-butadiene-styrene (ABS) terpolymer, 6.5-12 wt.% resorcinol-bis polycondensate, 3-6.5wt.% melamine cyanurate, 6.5-9 wt.% toughening agent, 0.5-1 wt.% lubricant and 0.2-1 wt.% antioxidant.    USE - Used as a halogen-free flame retardant battery shell material.    ADVANTAGE - The battery shell material has good flame resistance, and mechanical property; produces less amount of smoke while burning; does not generate toxic and corrosive gases; prevents the problem of poor dispersion and poor compatibility of phosphorus-nitrogen compound expansion-type flame retardant in ABS terpolymer, and is utilized as a new material in domestic batteries.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the battery shell material, comprising (i) adding resorcinol-bis polycondensate, melamine cyanurate, toughening agent, lubricant and antioxidant into a high-speed mixer, and mixing at a low rotational speed of 350-450 rotations/minute for 1.5-2.2 minutes, mixing at a rotational speed of 950-1050 rotations/minute for 0.8-1.5 minutes, and obtaining phosphorus-nitrogen compound flame retardant; (ii) adding phosphorus-nitrogen compound flame retardant and acrylonitrile-butadiene-styrene terpolymer into the high-speed mixer, mixing at a rotational speed of 350-450 rotations/minute for 1.5-2.2 minutes, and mixing at a rotational speed of 950-1050 rotations/minute for 0.8-1.5 minutes to obtain a premix, then extruding, and granulating the premix in a double-screw extruder, where the double-screw extruder temperature is controlled at 180-220 degrees C, the rotating speed of a main machine of the double-screw extruder is 1000-1100 rotations/minute, the double-screw extruder main motor frequency is 25 Hz, the feeding speed is 350-450 rotations/minute, and extruding and granulating to obtain halogen-free flame-retardant ABS plastic particles; and (iii) molding the halogen-free flame retardant ABS plastic particles in an injection molding machine to obtain the product.