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Modello Termico Batteria a Parametri Concentrati = Thermal Model of Li-Ion Battery Based on a Single Lumped Parameter Model

Pietro Ronzio

Modello Termico Batteria a Parametri Concentrati = Thermal Model of Li-Ion Battery Based on a Single Lumped Parameter Model.

Rel. Daniela Anna Misul. Politecnico di Torino, Corso di laurea magistrale in Automotive Engineering (Ingegneria Dell'Autoveicolo), 2022

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In recent years, electrification of transportation sector has become more relevant due to the growing necessity to reduce pollutants emitted by conventional engines, fed with carbon fossil fuels. One of the most important components of an electric powertrain is the energy storage system, usually a Lithium Ion battery, responsible of energy storage and generation of electric current to make the motor work. Among different factors affecting battery characteristics, such as performances, life time and safety, temperature is the one of biggest impact; thus its influence during normal working conditions must be monitored and studied. This thesis introduces a thermal lumped parameter model of a battery, implemented in MathWorks Matlab R2021a environment, able to estimate its temperature while undergoing some reference test cycles. Firstly, an equivalent circuit model with two RC branches of a single cell has been developed in order to simulate its behaviour. To assess the dependency of circuit parameters on temperature, a procedure of parameters identification has been carried out, where at each iteration, every parameter has been updated in order to match the simulated battery tension with the experimental data coming from the literature. Then, a thermal model has been developed following the classical energy balance equation and Bernardi’s equation of heat generation whose fundamental parameters, as convective heat transfer coefficient and specific heat, have been calibrated. Obtained results suggest that parameter identification procedure has correctly reported temperature influence on battery parameters, as well as considering the entropic term in the heat generation has helped in lowering the two thermal coefficients, assuming more realistic values. Finally a battery model made out of 25 cells has been constructed in the Simscape environment, whose results have been shown compatible with expectations, although the lack of a validation procedure with experimental data.

Relators: Daniela Anna Misul
Academic year: 2021/22
Publication type: Electronic
Number of Pages: 78
Corso di laurea: Corso di laurea magistrale in Automotive Engineering (Ingegneria Dell'Autoveicolo)
Classe di laurea: New organization > Master science > LM-33 - MECHANICAL ENGINEERING
Aziende collaboratrici: UNSPECIFIED
URI: http://webthesis.biblio.polito.it/id/eprint/23687
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