Performance requirements encompass mechanical strength, impact resistance, rigidity, and weight. For instance, iPhone materials evolved from plastic to metal to enhance impact resistance. Battery pack housings, serving as structural components, demand high rigidity. Lightweighting is a key requirement, and composite materials can achieve significant weight reduction. Safety and protection requirements include insulation properties, flame retardancy, ingress protection ratings, and corrosion resistance.
Insulation is a crucial protective measure for electrical equipment housings. Flame retardancy must meet UL94 standards; electric vehicle battery housings are required to be flame-retardant. Protection levels correspond to IP ratings for dust and water resistance. Housings must also possess exceptional corrosion resistance.
Environmental adaptability covers operating temperature ranges, weatherability (UV resistance), and chemical resistance. Both polycarbonate and FRP offer broad operating temperature ranges and excellent chemical resistance. Manufacturing processes and costs involve the specific fabrication methods required for different materials and their associated cost implications; common processes include CNC machining, injection molding, and stamping. Aesthetics and functional integration involve visual design, tactile feel, coloring techniques, and synergy with other functions.
For example, the iPhone utilizes coloring techniques such as anodizing and color-infused glass. Housings can integrate smart modules, such as NFC payment modules or health monitoring sensors. Metal housings offer superior heat dissipation, whereas plastic housings may overheat under high-load conditions.