Development and fabrication of high-energy and long-endurance Li-ion batteries for UAVs
In this study,three systems of cathode electrodes were prepared using high-nickel,ternary-single-crystal and polycrystalline particles.The negative electrode employed high-first-efficiency and low-expansion silicon-oxide particles.Individual cells were fabricated through the stacking and injection of pouch-cell components.Three distinct formation processes were used to activate individual cells:high-temperature exposure,pressurization,and stepwise current formation.The fabricated cells demonstrated an impressive capacity retention rate of 95.3%after 500 cycles.The individual cells demonstrated excellent electrochemical performance with a discharge capacity of 23 Ah and an energy density of 269 Wh/kg at 2 C.Following 1000 cycles at 1 C and 2 C,the capacity retention rate reached 88.3%.After storage in a high-temperature chamber for 7 days,the cells exhibited a capacity retention rate of 95.7%with a capacity recovery rate of 97.4%.The fabricated batteries also exhibited outstanding rate capabilities,with a discharge capacity ratio of 83.3%at 10 C using a 1 C discharge capacity as the reference.According to national standards,the cell also successfully passed rigorous heating and external short-circuit safety requirement evaluations.Furthermore,by selecting six individual cells with high consistency and assembling them in series,a unmanned aerial vehicle(UAV)battery pack was successfully developed.The dimensions of the battery pack were 81 mm×183 mm×71 mm,weighing 1902 g with an energy density of 240 Wh/kg at 2 C.This design ensures reliable power supply for UAVs under various working conditions.
unmanned aerial vehicleLi-ion batteryhigh energy densitybattery pack
万方数据
维普
