Análise térmica de baterias de segunda vida: uma abordagem utilizando modelo de circuito equivalente e simulação CFD

Abstract

With the development of the automotive sector and the popularization of electric vehicles, questions and debates arise concerning batteries, specifically regarding their disposal. Consequently, a need emerged to propose ideas for a new purpose for these batteries, such as their utilization for energy storage through the development of a BESS (Battery Energy Storage System). Following this direction, a project was initiated by CNPq in conjunction with the UTFPR Ponta Grossa campus and in partnership with Renault Group, entitled 'Development of a second-life battery energy storage system well adapted to the requirements of the low-voltage electricity distribution network,' utilizing the batteries from three Renault Kangoo Z.E. vehicles. The central objective is the thermal analysis of the battery modules, seeking to visualize the temperature distribution and validate the computationally obtained results against practical data. Initially, a simplified 3D model of the module was created, followed by the Hybrid Pulse Power Characterization (HPPC) test to obtain the necessary parameters for the simulations. With these data, it was possible to perform the thermal simulation using the ANSYS software, while simultaneously conducting practical bench tests using LM35 sensors for temperature measurement. The comparison between the experimental results and the numerical simulation results obtained through the ANSYS software revealed a good correlation between the data, with an error of less than 3% for the final temperature in the validation scenario.