Modern car body mainly adopts the design of load-bearing body. The body is almost loaded with bears in the use of the car, including torsion, bending, vibration and collision, etc. The main idea of automobile help electric is that the body must have enough stiffness and strength to ensure the use and dynamic performance requirements of the vehicle.

　　扭轉剛度是汽車最重要的性能指標之一。合理的扭轉剛度設計可以避免車身在多種工況下的可靠性、耐久性、振動、噪聲等相關問題，使整車綜合性能指標得到提高。

　　Torsional stiffness is one of the most important performance indicators of automobiles. Reasonable torsional stiffness design can avoid the reliability, durability, vibration, noise and other related problems of the body under various working conditions, and improve the comprehensive performance index of the vehicle.

　　實際上，機體的失效主要是由扭轉疲勞引起的。當扭轉剛度不足時，機體在外力作用下會產生較大的扭轉變形。反復疲勞負荷局部弱項，就像折斷筷子一樣。

　　In fact, the failure of the body is mainly caused by torsional fatigue. When the torsional stiffness is insufficient, the body will produce large torsional deformation under the action of external forces. The local weakness of repeated fatigue load is like breaking chopsticks.

　　什么原因導致車身變形

　　What Causes the Body Deformation

　　什么樣的車身能達到更高的扭轉剛度?路尊汽車電動助力大師說，其實，除了使用高強度材料外，結構設計尤為關鍵。例如，當電動汽車的離體電池處于沒有縱梁的區域時(即在電池區域的中央通道被切斷)，它的縱梁會比傳統燃料汽車的弱，電池區域會整體變軟。

　　What kind of body can achieve higher torsional stiffness? Lu Zun automobile electric power assistant master said, in fact, in addition to the use of high-strength materials, structural design is particularly critical. For example, when the isolated battery of an electric vehicle is in the area without longitudinal beam (that is, the central channel of the battery area is cut off), its longitudinal beam will be weaker than that of a conventional fuel vehicle, and the battery area will become weaker as a whole.

　　關于扭轉剛度的重要性，我們知道純電動汽車非常重視輕量化系數，這是通過綜合車身尺寸、質量和性能的性能數據得到的。輕量化系數越小，單位能量吸收指數的重量成本越低。在這個公式中，除了車輛的重量和車身尺寸外，唯一的“強度”指標是扭轉剛度。

　　Regarding the importance of torsional stiffness, we know that pure electric vehicles attach great importance to lightweight coefficient, which is obtained by synthesizing the performance data of body size, quality and performance. The smaller the lightweight coefficient is, the lower the weight cost per unit energy absorption index is. In this formula, except for the weight of the vehicle and the size of the body, the only "strength" index is the torsional stiffness.