Abstract:

Although traditional fast charging methods can increase charging time of lithium ion battery, they are usually detrimental to battery life and causes safety problem. A control-oriented electrochemical model of lithium ion battery was used to develop a novel model-based fast charging algorithm to solve the problem of accelerated degradation or safety issues during the fast charging. The algorithm was validated by charging a commercial Li(NiMnCo)O2 (NMC) cathode battery of 42 Ah. The effect of the key parameters of the strategy on the algorithm performance, such as threshlod potential and initial charging rate, were also discussed. The results show that safe fast charging was achieved and charging rate was enhanced by 20.5%. As the critical parameters in the algorithm, threshold potential and initial charging rate influenced the charging time and anode overpotential during charging

Key words: electric vehicle, lithium ion battery, electrochemical model, fast charging