▎ 摘　　要

NOVELTY - A composite battery housing comprises a composite material and a bent portion in which one side of the composite material is bent by heat. All or portion of the composite material is formed of glass fiber-continuous fiber thermoplastic (G-CFT). The composite material has a thickness of 3 mm, and comprises a unidirectional (UD)-prepreg (A) having an arrangement of continuous fibers (A) in one direction and a UD-prepreg (B) having an arrangement of continuous fibers (B) in one direction. The fiber (A) is a glass fiber strength reinforcing layer. The fiber (B) is a carbon fiber shielding reinforcing layer. The strength reinforcing layer is arranged on the upper and lower portions of the shielding reinforcing layer, and provided on the inner surface and the outer surface of the battery housing to protect the housing from physical impact. The strength reinforcing layer and the shielding reinforcing layer contain a base resin. USE - Composite battery housing for battery used in electric vehicle. ADVANTAGE - The fuel efficiency of a vehicle is improved by using a lighter composite material than a conventional metal material. The composite material is safe to use due to rigidity, shielding effect and flame retardancy. The weight of the battery housing is reduced and the cost is reduced due to the reduction of the manufacturing process. DETAILED DESCRIPTION - A composite battery housing comprises a composite material and a bent portion in which one side of the composite material is bent by heat. All or portion of the composite material is formed of glass fiber-continuous fiber thermoplastic (G-CFT). The composite material has a thickness of 3 mm, and comprises a unidirectional (UD)-prepreg (A) having an arrangement of continuous fibers (A) in one direction and a UD-prepreg (B) having an arrangement of continuous fibers (B) in one direction. The fiber (A) is a glass fiber strength reinforcing layer. The fiber (B) is a carbon fiber shielding reinforcing layer. The strength reinforcing layer is arranged on the upper and lower portions of the shielding reinforcing layer, and provided on the inner surface and the outer surface of the battery housing to protect the housing from physical impact. The strength reinforcing layer and the shielding reinforcing layer contain a base resin. All or portion of the base resin is impregnated with polyamide (PA6) and/or polycarbonate (PC). The base resin is a carbon nanocomposite containing 3% carbon nanotube (CNT), fullerene, graphene and/or conductive nano carbon black. The bent portion contains an bending tray provided with an infrared (IR) heater for heating the composite material at 600-1000 degrees C, and has a beautiful surface. The composite material is cooled after bending in a molten state to a preset degree after heating. The IR heater is heated to a uniform temperature as a whole. The temperature deviation of the IR heater is formed within 5 degrees C. The bending tray is formed to be detachable and rotatable based on the IR heater. After seating the composite material on the upper end, the IR heater is heated and the bent portion is rotated by the bending tray.