Razvoj i implementacija termalnog modela litijeve baterijske ćelije

master's thesis

• Title (english): Development and implementation of a lithium battery cell thermal model
• Author: Domagoj Šimunec
• Mentor: Danijel Pavković (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Power Engineering

Abstract

Ovaj diplomski rad daje pregled tehnologija sekundarnih litijevih baterija, uspoređujući karakteristike pojedinih elektrokemijskih sastava, s naglaskom na litij-titanat bateriju kao najsigurniju i temperaturno najneovisniju vrstu litij-ionske baterije. Nadalje, predstavljeni su strujno-naponski modeli za opisivanje dinamike baterije, zajedno s detaljnijim prikazom Theveninovog modela baterije kao ekvivalentnog modela strujnog kruga baterije korištenog u ovom radu. Razvijen je i odgovarajući matematički model kao osnova za simulacijski model koji opisuje mehanizme zagrijavanja temeljene na reakcijskoj i polarizacijskoj toplini te toplini unutarnjeg otpora. Simulacijski model koristi tehničke specifikacije koje je dao proizvođač i eksperimentalno dobivene parametre za Theveninov model litij-titanat baterije. Nakon što su osigurani svi potrebni podaci na razini modela baterije, cijeli model je implementiran u programskom paketu Matlab/Simulink. Rezultati simulacije prate različite toplinske tokove tijekom punjenja i pražnjenja litij-titanat baterije uz simultano izračunavanje rezultirajućeg zagrijavanja, odnosno povećanja temperature baterije.

Abstract (english)

This master’s thesis provides an overview of lithium secondary battery technologies, comparing the characteristics of individual electrochemical compositions, with an emphasis on the lithium-titanate battery as the safest and most temperature-independent type of lithium-ion battery. Furthermore, current-voltage models are presented to describe battery dynamics, along with a more detailed presentation of the Thevenin battery model as the equivalent battery circuit model used in this work. A corresponding mathematical model has also been developed as a basis for the simulation model which describes the heating mechanisms based on reaction and polarization heat, and internal resistance heat. Simulation model uses the technical specifications provided by the manufacturer and experimentally obtained parameters for the lithium titanate battery Thevenin model. After all the necessary data at the battery model level were provided, the entire model was implemented in the Matlab/Simulink software package. The simulation results track different heat fluxes during charging and discharging of the lithium titanate battery, while calculating the resulting heating, i.e. battery temperature increase.

• Keywords: litij-titanat (LTO) baterija; Theveninov model baterije; termalni model LTO baterije; Matlab/Simulink
• Keywords (english): lithium titanate (LTO) battery; Thevenin battery model; LTO battery thermal model; Matlab/Simulink
• Language: croatian
• URN:NBN: urn:nbn:hr:235:622684
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechanics and Robotics, Autonomous Systems, Mechatronics and Robotics; Course: Mechatronics and Robotics; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva (sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2027-02-01
• Created on: 2025-01-31 17:47:54