NOVELTY - A polyphenylene ether resin alloy material comprises 40-60 pts. wt. polyphenylene ether resin, 20-60 pts. wt. polystyrene resin, 1-3 pts. wt. polyolefin, 1-8 pts. wt. elastomer, 1-15 pts. wt. flame retardant, 10-20 pts. wt. glass fiber, 1-15 pts. wt. grafted component, 3-8 pts. wt. functional masterbatch, and 0.2-0.5 pt. wt. antioxidant. The elastomer is (hydrogenated) styrene-butadiene rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, polyacrylate rubber, ethylene copolymer elastomer, polyisoprene elastomer, and/or 1,2-polybutadiene elastomer.    USE - Polyphenylene ether resin alloy material is used for electric-vehicle lithium ion battery housing (claimed).    ADVANTAGE - The polyphenylene ether resin alloy material provides battery housing having excellent durability and deformation resistance. Cracking of electrode connection is prevented.    DETAILED DESCRIPTION - A polyphenylene ether resin alloy material comprises 40-60 pts. wt. polyphenylene ether resin, 20-60 pts. wt. polystyrene resin, 1-3 pts. wt. polyolefin, 1-8 pts. wt. elastomer, 1-15 pts. wt. flame retardant, 10-20 pts. wt. glass fiber, 1-15 pts. wt. grafted component, 3-8 pts. wt. functional masterbatch, and 0.2-0.5 pt. wt. antioxidant. The elastomer is styrene-butadiene rubber, hydrogenated styrene-butadiene rubber, propylene rubber, polyacrylate rubber, ethylene copolymer elastomer, polyisoprene elastomer, and/or 1,2-polybutadiene elastomer. The grafted component is polyphenylene ether resin, polyethylene resin, polyolefin, and/or elastomer, and the graft component is acetic anhydride, propionic anhydride, succinic anhydride, maleic anhydride, benzoic anhydride, and/or phthalic anhydride. An INDEPENDENT CLAIM is included for preparation of polyphenylene ether resin alloy material, which involves preparing functional masterbatch, extruding and pelletizing using a twin-screw extruder at 260-300 degrees C, 250-350 rpm and 0.5-0.8 MPa, mixing polyolefin, elastomer, flame retardant, grafted component, functional masterbatch, and antioxidant, adding polyphenylene ether resin, glass fiber, and polystyrene resin, and melt-extruding using a twin-screw extruder.