基于负泊松比微结构的飞行汽车液冷电池包热学性能分析

A novel battery pack for flying cars embedded with triangle umbrella-shaped cellular structure （TUCS） is proposed is proposed in this paper. Firstly， heat generation model of lithium battery is derived and corre⁃ sponding finite element model of lithium battery cell is established. Then， discharge tests are conducted on lithium battery cells and the accuracy of heat generation model and finite element model is verified. Moreover， theoretical thermodynamic model of TUCS is derived and the optimization design is conducted. The optimal TUCS is achieved and then embedded into liquid-cooling battery pack of flying car. Meanwhile， the effects of coolant flow velocity， coolant flow direction， internal density gradient within TUCS， and interlayer density gradient on heat dissipation performances of novel battery pack is investigated to obtain the novel flying car battery pack with optimal heat dissi⁃ pation performance. The maximum temperature and maximum temperature difference of the novel flying car battery pack is 32.0 and 4.01 respectively under typical operating conditions of flying cars， which are within the normal operating range， a decrease by 24.24% and 71.72% in comparation with those of conventional battery pack， respec⁃ tively， thus verifying the excellent heat dissipation performance of the new flying car battery pack. Finally， the nov⁃ el flying car battery pack sample is fabricated and discharge tests on TUCS battery pack sample are conducted. The accuracy of theoretical models and numerical simulation presented are verified.