Charging and balancing system for Li-ion batteries

U diplomskom radu je prvotno ispitana litij ionska baterija sastavljena od četiri serijski spojene ćelije bez sustava za balansiranje. Programska podrška za izradu aplikacije je LabVIEW. Nakon toga je izveden modificirani sustav za balansiranje ćelija tijekom punjenja. Uspoređene su vrijednosti kapaciteta i energije koje je moguće pohraniti u bateriju tijekom punjenja sa i bez sustava za balansiranje. Navedeni sustav za balansiranje nije pogodan za velike struje, što je i razumljivo, jer su gubici na otpornicima proporcionalni kvadratu struje.In this graduation thesis, firstly, lithium ion battery composed of four cells connected in series was tested without cell balancing system. Monitoring application was programmed in software environment LabVIEW. After that, modified system for cell balancing during the process of charge was built. The amounts of capacity and energy that were stored in the battery during the process of charge with and without cell balancing system were compared. Mentioned cell balancing system is not advisable for big currents, what is understandable, because resistor losses are proportional with the square of current