锂离子电池动态特性对倾转式eVTOL飞行性能的影响

Effects of dynamic characteristics of lithium-ion battery on flight performance of tilting eVTOL aircraft

关键词:  倾转式  eVTOL飞行器  飞行性能评估  电池动态特性  电能需求规律

Key words:  Tilting  eVTOL aircraft  Flight performance evaluation  Battery dynamic characteristics  Power demand law

摘要:

为准确分析倾转式电动垂直起降飞行器（eVTOL）飞行剖面的变化和锂离子电池的动态特性对飞行性能的影响，结合锂离子电池等主要部件特性建立电动系统模型，提出考虑电池动态特性的eVTOL飞行器性能计算方法，并应用所提出的性能方法对锂离子电池动态特性的影响进行分析，提炼eVTOL飞行器对电能的需求规律。示例飞行器性能仿真表明，锂离子电池动态特性对动力系统功率产生影响，使悬停垂降时电池输出功率密度仅为垂起悬停阶段的78%；同时影响巡航性能，使巡航末段单位能耗航时和航程相比于起始段减少16%和17%。

Abstract:

To accurately analyze the changes in the flight profile and the impact of the dynamic characteristics of lithium-ion batteries on flight performance of the tilt electric vertical takeoff and landing vehicle （eVTOL）， an electric system model based on the characteristics of main components such as lithium-ion batteries was established， and a performance calculation method for eVTOL aircraft considering the dynamic characteristics of the battery was proposed. The influence of the dynamic characteristics of lithium-ion batteries was analyzed， and the electricity demand law of eVTOL aircraft was summarized. The performance simulation of an example aircraft shows that the dynamic characteristics of lithium-ion batteries have an impact on the power of the power system， resulting in that a battery output power density during hover descent is only 78% of that during the hover phase， simultaneously affecting cruise performance， resulting in a reduction of 16% and 17% in unit energy consumption and range in the final stage of cruise compared to the initial stage.