Thermal Simulation of UAV Li-Po Batteries under Abnormal Ageing Conditions

The temperature changes under thermal, electrical and mechanical abuse conditions were simulated via COMSOL Multiphysics software on the basis of heat generation mechanisms and heat transfer processes to simulate the thermal behaviour of lithium-polymer (Li-Po) batteries for unmanned aerial vehicles (UAVs).The temperature changes of batteries under different abnormal ageing conditions were analysed, the temporal-spatial evolution patterns of temperature fields were revealed, and the dynamic evolution characteristics of thermal behaviour were obtained.Results show that the maximum temperature rise of batteries after charge-discharge cycles progressively intensifies as ambient temperature increases.Overcharging and nail puncture generate substantial heat, thereby inducing abrupt temperature surges in batteries, with peak temperatures of overcharged and punctured batteries reaching 105 C and 300 C, respectively.The obtained conclusions provide some theoretical references and decision-making foundations for controlling thermal runaway in lithium batteries under abnormal ageing conditions.