A Variable Frequency Pulse Fast Charging Technique for Li-Ion Batteries based on Fuzzy Control

摘要

To further shorten the charging time, enhancing charging efficiency and extending battery charge cycle life, this paper presents a variable frequency pulse fast charging methods based on fuzzy control depolarization. This method uses perturbation and observation method tracking resonant frequency real- timely and then finds the maximum current corresponding to the resonant frequency to charge the battery while using fuzzy control technology to detect and eliminate polarization effects arising from the charge process to accelerate the charging speed and realize frequency-varied fast charging. Experiments showed that using the fuzzy control frequency-varied pulse charging technique improves the charging time, charging efficiency, and rising temperature of the Li-ion battery by about 6.9%, 2.4%, 17.3%, respectively, as compared with the currently used fast charging method of intermittent alternating current.