Fizikalno-kemijsko konsistento nadomestno vezje za modeliranje Li-ionskih baterij

Cimermančič, Matevž (author), Katrašnik, Tomaž (mentor)

V magistrskem delu smo raziskali delovanje litij-ionskih baterij s ciljem analize napovedovalnosti in sposobnosti enolične parametrizacije inovativnega fizikalno-kemijsko konsistentnega nadomestnega vezja, ki smo ga implementirali v programskem okolju Python. Na podlagi simulacijskih rezultatov smo izvedli analizo napačnosti napovedovanja napetostnega odziva baterijske celice implementiranega numeričnega modela napram laboratorijskim meritvam zastavljenih protokolov polnjenja in praznjenja. Nato smo model numerično validirali z ozirom na enolično določljivost modelskih parametrov. Rezultati kažejo, da ima model odlične sposobnosti prileganja simulacijskih in merjenih vrednosti napetosti, ravno tako pa ima tudi dobre ekstrapolacijske lastnosti. Ena ključnih prednosti analiziranega modela pred obstoječimi modeli je sledenje potencialu vsaki izmed elektrod posebej.

• Language: Slovenian
• Keywords: elektromobilnost, litij-ionske baterije, modeliranje, nadomestno vezje, napovedovanje stanja napolnjenosti, simulacije.
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Cimermančič]
• Year: 2023
• Number of pages: XX, 78 str.
• PID: 20.500.12556/RUL-148752
• UDC: 621.352:621.3.049:004.925.8(043.2)
• COBISS.SI-ID: 167923459
• Publication date in RUL: 31.08.2023

Secondary language

• Language: English
• Title: A physico-chemical consistent equivalent circuit for modeling Li-ion batteries

Abstract

In master thesis we investigated the performance of lithium-ion batteries with the aim of analysing the predictability and the ability to uniquely parameterise an innovative physico-chemical equivalent circuit, which we implemented in the Python. Based on the simulation results, we performed an analysis of the accuracy of the battery cell voltage response prediction of the implemented numerical model against laboratory measurements of the set charging and discharging protocols. The model was then numerically validated with respect to the uniqueness of the model parameters. The results show that the model has excellent fitting abilities to the simulated and measured voltage values, as well as good extrapolation properties. One of the key advantages of the model analysed here over existing models is that the potential of each electrode is tracked separately.

• Keywords: electromobility, lithium-ion bateries, modeling, equivalent circuit, state-of-charge prediction, simulations.