Razvoj modela za oceno notranjih parametrov baterije v dirkalniku Formula Student Team Ljubljana

ALIČ, KRIŠTOF (author), Logar, Vito (mentor)

V magistrski nalogi je predstavljena izdelava modela ocene notranjih stanj baterijskega paketa (v nadaljevanju BP) v dirkalniku Formula Student. Vsak energijski presežek v BP ob koncu vztrajnostne preizkušnje se odraža kot čista izguba energije, hkrati pa se lahko zgodi, da zaradi prevelike porabe predčasno zaključimo preizkušnjo. Z oceno stanja naboja ocenjujemo, koliko energije nam je še ostalo v BP. S tem podatkom lahko voznik prilagodi način vožnje, da dosežemo čim boljši čas in končamo preizkušnjo. BP je sestavljen iz baterijskih celic (v nadaljevanju BC). S simulacijo vsake BC posebej ter principa superpozicije lahko ustvarimo simulacijski model BP v poljubni vezavi. S simulacijskim modelom lahko preverimo kvaliteto BP na osnovi različnih BC in se nato s podatki simulacije in proračuna odločimo, kakšen BP bomo izdelali in uporabili v dirkalniku. Parametriziral sem 4 BC, 2 cilindrični (Sony VTC5 in VTC6A) in 2 ploščati (Meslasta SLPB9544124 in Melasta SLPB9070175). Validacijo in oceno kvalitete modela sem opravil na BC VTC5 in SLPB9544124. BC VTC5 so bile uporabljene na dirkalniku Svarog (sezona 2019) in Eldrax (2018), BC SLPB9544124 pa so osnova BP za dirkalnik Tabaluga (2021). Modeliranje je bilo uspešno za obe izbrani BC, zaradi česar je bila ocena stanja naboja implementirana tudi na dirkalniku Tabaluga.

• Language: Slovenian
• Keywords: baterijski paket, baterijske celice, stanje naboja, formula student, simulacija, modeliranje
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2021
• PID: 20.500.12556/RUL-131485
• COBISS.SI-ID: 78285315
• Publication date in RUL: 28.09.2021

Secondary language

• Language: English
• Title: Development of a model for estimation of internal battery parameters for Formula Student Team Ljubljana

Abstract

This master's thesis describes the modelling procedure of the battery pack (BP) for the Formula Student race car. Any energy surplus in the BP at the end of the endurance time trial is reflected as an energy loss. On the other hand, due to excessive consumption, the trial can end with disqualification. By estimating the battery's state of charge, we can assess how much energy is still in the BP. With this information, the driver can adjust the consumption while driving, to achieve the best possible time and to finish the trial. Each battery pack is made from battery cells (BC). By simulating each one and using the principle of superposition, we can develop a simulation model of an arbitrary BP. Thus, we can check its responsiveness with minimal investment. After the simulations, we can choose a BP based on BC, which provides the best ratio between its quality and cost. In the scope of modelling, we parameterized 4 cells, i.e. 2 cylindrical (Sony VTC5 and VTC6A) and 2 flat (Melasta SLPB9544124 and SLPB9070175). We validated and evaluated the quality of the model on BC VTC5 and SLPB9544124. BC VTC5 was used as a base for the BP for the Svarog (2019 season) and the Eldrax (season 2018), while the BC SLPB9544124 are the basis of the BP in the Tabaluga race car (season 2021). The modelling was successful for both selected cells; thus, the state-of-charge estimation was also implemented and tested on the Tabaluga race car.

• Keywords: battery pack, battery cell, state of charge, formula student, simulation, modelling