Chapter 7 - Equivalent modeling study of aviation lithium-ion batteries

Abstract

To be able to accurately describe the dynamic characteristics of the aviation lithium-ion batteries and to accurately estimate its state of charge and state of health, this chapter takes into account the differences between charge and discharge open-circuit voltages. A correction module for open-circuit voltages was introduced into the Thevenin equivalent model to create an M-Thevenin equivalent model. By comparing different parameter identification methods, the recursive least squares (RLS) method was chosen for accurate parameter identification of the equivalent model. The experiments show that the M-Thevenin equivalent model and the RLS method have a high degree of accuracy, with a maximum error within 0.0600V and the average error of 0.0079V, as well as provide a basis for the subsequent state of health estimation.