电源技术2026，Vol.50Issue(1)：100-109,10.DOI:10.3969/j.issn.1002-087X.2026.01.013
巡航气压下倍率对三元锂电池性能及安全的影响
Influence of cruise pressure rate on performance and safety of ternary lithium battery
摘要
Abstract
With the rapid development of electric aircraft,lithium batteries will face the test of cyclic performance and safety in cruising low-pressure flight conditions.The effects of different discharge rates(3 C,5 C,7 C)at normal pressure(95 kPa)and cruise low pressure(30 kPa)on the cycle perfor-mance and thermal safety characteristics of ternary lithium batteries were investigated experimen-tally.The results show that the combination of low air pressure and high rate significantly increases the risk of battery aging and thermal safety.After 200 cycles,the capacity retention rate of the high power rate(7 C)battery at 30 kPa decreased to 85.94％,and the DC internal resistance increased to 59.68％,which was much higher than the normal pressure environment.Battery cell disassembly and dQ/dV analysis showed that the low pressure and high power rate synergistic accelerated the elec-trode structural damage and active lithium loss.High rate discharge at low pressure leads to a signifi-cant increase in surface temperature(up to 107.1℃ at 7 C),the heat transfer coefficient and heat transfer capacity have decreased,exacerbating the risk of heat accumulation.The thermal runaway experiment shows that the thermal runaway triggering temperature and time of the battery are lower at normal pressure,while the initial thermal runaway temperature is increased at low pressure,the maximum temperature rise is decreased,and the potential thermal hazard concealment is enhanced.关键词
锂电池/巡航低气压/放电倍率/循环性能/热安全Key words
lithium battery/cruising low pressure/discharge rate/cycle performance/thermal safety分类
信息技术与安全科学引用本文复制引用
崔庆康..巡航气压下倍率对三元锂电池性能及安全的影响[J].电源技术,2026,50(1):100-109,10.基金项目
辽宁省教育厅基本项目(JYTM20230240) （JYTM20230240）
