A Temperature and Voltage Coupling Equivalent Electrical Behavior Model of Lithium‐Ion Battery Pack for Electric Unmanned Aerial Vehicle under Variable Load Conditions

Abstract

It is a valuable and challenge problem to reveal the coupling mechanism between heat and electricity in lithium‐ion battery under variable load conditions. A temperature–voltage coupling equivalent electrical behavior model for lithium‐ion battery under variable load conditions is established to describe the electrical behavior of the battery by analyzing the effect of temperature on particle motion, the effect of particle motion on charge distribution, and the effect of charge distribution on the electrical behavior of the battery and to accurately portray the temperature and voltage coupling mechanism. In the model, heat is taken as the state variable of lithium‐ion battery, and the relationship between the external temperature and voltage is described. The model is verified by simulation and measured data of lithium‐ion battery used in electric unmanned aerial vehicles. The results indicate that the established temperature–voltage coupling model can accurately describe the electrical behavior of the battery and can accurately reveal the coupling relationship between temperature and voltage, and the effect of temperature on the electrical behavior of the battery reflected by the model is basically consistent (voltage and temperature mean absolute percentage error is 5.50% and 2.02%, respectively) with the measured data.