Estudo comparativo entre os métodos de estimação de estado de carga para veículos elétricos

Abstract

This project aims to study the State of Charge Estimation Methods and perform an analysis of the factors that affect the expansion of automotive-type battery electric vehicles (BEVs) in Brazil, contributing to the production of research sources on the subject. The historical context and evolution of BEVs is analyzed, presenting the reasons that led them to lose space to vehicles powered by internal combustion engines at the beginning of the 20th century. Subsequently, the circumstances related to conventional vehicles that interact with BEVs are analyzed, as well as the specific characteristics and circumstances of this study of modeling lithium-ion batteries and a comparative study of estimating the state of charge of electric vehicles. The modeling approach was carried out using equivalent circuits with details of the variables and parameters that influence the process, giving a critical focus on the analysis of existing methods. In the methodology, the conceptual part of the theoretical foundation was used, then moving on to the modeling, analysis, conclusion of the analysis and measurement stages. The Coulomb count estimation method estimates the state of charge of the battery based on the integral of electrical current over time. Despite being simple, as it is open-loop, it has accumulative error. The methodologies were compared with each other in terms of precision and accuracy using some tools, the models proved to be satisfactory and the results provide insights into the effectiveness and efficiency of the proposed approaches.