Ph'D defense M Pedro Von Hohendorff Seger
M Pedro Von Hohendorff Seger will present his thesis "Modélisation sous Incertitudes et Management Énergétique de Batteries Li-ion de Seconde Vie".
Abstract :
Currently, the electric vehicle market is developing very rapidly in France and Europe and the notion of resource circularity must be addressed urgently. The Li-ion batteries used in these vehicles are high-tech and high-value, with high production costs and emissions. As these batteries are often replaced when they reach about 80% of their initial capacity, extending their life is a way to get a better return on this initial cost and emissions.
This thesis is dedicated to the study of so-called second life applications for Li-ion batteries. The main scientific issues identified and addressed in this work are related to the limitations of existing models - especially in terms of uncertainties, which become more important with aging - and a sizing and management strategy to better integrate these second life batteries in real applications.
Two models are proposed in this work to properly characterize these batteries. First, we parameterize a cell voltage response model, allowing to evaluate the evolution of parameters such as internal resistance with aging. We also study the transition from a "cell" model to a "pack" model and the ensuing propagation of uncertainties. Then, we propose a cycling aging model for these batteries, again with uncertainties and a study of their propagation. To this model we associate a cycle counting algorithm, constituting a tool capable of estimating the aging in second life according to the real conditions of use. We use this tool to optimize the sizing and management of a microgrid integrating a stationary second-life battery, while evaluating the impact on its lifetime. This work provides the methodological framework to integrate second life batteries in new applications.
Date infos
Defense 25 November 2022 at 14HAddress of the defense : Amphi Bergès (Greener).