Development and fabrication of high-energy and long-endurance Li-ion battery for UAV

doi:10.19799/j.cnki.2095-4239.2024.0147

Abstract

Abstract:

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 process of pouch cell components. Employing three distinct formation processes to activate individual cells, particularly the cells subjected to high-temperature and pressurization and stepwise current formation, demonstrated an impressive capacity retention rate of 95.3% after 500 cycles. The individual cell demonstrated excellent electrochemical performance with a discharge capacity of 23 Ah and an energy density of 269 Wh/kg at a 2 C rate. Following 1000 cycles at 1 C/2 C rate, the capacity retention rate reached 88.3%. After being stored in a high-temperature chamber for 7 days, the cell exhibited a capacity retention rate of 95.7%, with a capacity recovery rate of 97.4%. The battery also exhibited outstanding rate capability, with a discharge capacity ratio of 83.3% at 10 C rate, using 1 C discharge capacity as the reference. According to national standards, the cell also successfully passed rigorous heating and external short-circuit safety requirement tests. Furthermore, by selecting six individual cells with higher consistency and assembling them in series, a Unmanned Aerial Vehicle (UAV)battery pack was successfully developed. The dimensions of the battery pack were 81*183*71 mm, weighing 1902 g, with an energy density of 240 Wh/Kg at a 2 C rate. This design ensures reliable power support for UAV under various working conditions.

Key words: unmanned aerial vehicle, Li-ion battery, high energy density, battery pack

CLC Number:

TM911

wenhao GONG, meng LI, tao ZHANG, ruotao ZHANG, yanxia LIU. Development and fabrication of high-energy and long-endurance Li-ion battery for UAV[J]. Energy Storage Science and Technology, doi: 10.19799/j.cnki.2095-4239.2024.0147.

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材料	D50（μm）	比表面积（m²/g）	首效(%)	0.1 C放电容量 (mAh/g)
多晶NCM	12.9	0.52	90.3.	220.4
单晶NCM	3.8	0.58	89.5	222.3
混合NCM	10.1	0.56	89.5	219.4.

材料	D50（μm）	比表面积（m²/g）	首效(%)	0.2C放电容量(mAh/g)	膨胀率/%
硅氧400	14.7	1.49	89.8.	401.2	9%
硅氧450	13.4	1.6	86.9	450.6	16%
硅氧500	12.2	1.96	84.6	503.6	20%

电池组性能	测试数据
尺寸	8118371 mm
重量	1902 g
2 C放电容量	21.6 Ah
2 C能量密度	240 Wh/Kg

配重/Kg	飞行段	峰值电流/A	功率/W	倍率
10	起飞	73	1600	3.3 C
10	悬停	58	1200	2.6 C
1	极限飞行	74	1620	3.4 C

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