Why was an integrated hot-formed door ring designed for the Xiaomi Pengcheng N90 Max?
Safety comes first. The armor cage body of the Xiaomi Pengcheng N90 Max utilizes extensive high-strength materials and structural designs to improve occupant protection. A key component is the integrated hot-formed door ring. While mainstream industry designs typically cover only up to the C-pillar, the door ring on the Xiaomi Pengcheng N90 Max is 3289mm long and 1556mm high, covering the A, B, C, and D pillars and spanning all three rows. This effectively enhances protection for the top and sides of the passenger compartment, providing more comprehensive protection for passengers in every row.
In addition, each side of the door ring incorporates four reinforcements using 2200MPa Xiaomi Ultra-High Strength Steel, further improving protection in scenarios such as small overlap collisions and side impacts.
The integrated hot-formed door ring of the Xiaomi Pengcheng N90 Max is formed by laser welding multiple sheets into one piece, followed by single-step hot-forming stamping. Compared to the traditional method where multiple stamped parts are formed separately and then joined by resistance spot welding, the integrated molding creates a continuous and complete door ring structure. This significantly increases overall strength while reducing the risk of weld point failure. For example, in side pole impact scenarios, the integrated hot-formed door ring improves the vehicle's lateral load-bearing capacity by 19%.
Beyond the door ring, the armor cage body of the Xiaomi Pengcheng comprehensively strengthens the vehicle's safety architecture. Taking the Xiaomi Pengcheng N90 Max as an example, high-strength steel and aluminum alloys account for 90.4% of the body. The vehicle uses sixteen instances of 2200MPa Xiaomi Ultra-High Strength Steel, combined with high-strength designs such as the integrated hot-formed door ring, integrated hot-formed front floor frame, and a 2200MPa "embedded roll cage," establishing all-around passive safety protection.