Finding a better fit for lithium ion batteries: A simple, novel, load dependent, modified equivalent circuit model and parameterization method

Equivalent circuit models (ECM) of lithium ion batteries are used in many applications because their ease implementation and low complexity. The accuracy an ECM is critical to the functionality usefulness battery management system (BMS). depends on parametrization method, therefore different experimental techniques model parameter identification methods (PIM) have been widely studied. Yet, how account for significant changes time constants between operation under load during relaxation has not resolved. In this work a novel PIM modified presented that increases by 77.4% drive cycle validation 87.6% constant current large format iron phosphate prismatic cell. uses switching RC network values each phase, which cell particularly at state-of-charge all batteries. Different characterisation tests corresponding data trained together across complete State-of-Charge (SoC) temperature range, enables smooth transition identified parameters. Ultimately, created using parameters captured proposed shows improved comparison with conventional techniques.