Design of sinusoidal current charger with optimal frequency tracker for Li-ion battery

Abstract

In this paper, a sinusoidal current charger Sin-CC with optimal frequency tracker is proposed for Li-ion battery. The proposed optimal frequency tracker is mainly constructed by the phase-lock-loop so that the features of detecting, tracking and locking in the optimal charging frequency can be achieved. The experimental results show that the charging speed charging efficiency and increasing surface temperature of the proposed Sin-CC are improved about 5%, 5.5% and 51.5%compared with that of the conventional constant current charge system.

Fast Estimation of State of Charge for Lithium-Ion Batteries

“…Expressing Equation (12) in complex form, the battery impedance can be expressed as: (13) where Z' represents the real part of the complex; Z" represents the imaginary part of the complex; |Z| represents the magnitude of AC impedance; and θ represents the angle of AC impedance [22][23][24].…”

Improved Performance of Li-ion Polymer Batteries Through Improved Pulse Charging Algorithm

“…Several authors [19,24,25] have proposed charging techniques based on the polarization of the battery, taking into account the temporarily evolving internal impedance of the battery. Other battery charging algorithms [18,[26][27][28][29][30][31][32][33] use pulse and sinusoidal waveforms to charge the battery. Of these proposed charging algorithms, the most promising and simple is the pulse charging algorithm.…”