The Search for Optimal Pulse Charging Parameters and the Impact of These Parameters on Lithium Ion Batteries
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In this day and age, consumers of electronic devices seek faster battery charging and longer battery runtime. Different methods have been proposed to reduce battery charge time and also increase the battery charge and energy efficiencies, which will in turn improve battery runtime. Of these methods, pulse charging is the most promising and less complex. However, the pulse charge currents used in pulse charging have different factors and factor levels. The different combination of these factors and their levels can result in either poor battery charge and energy efficiencies or longer charge times. These factors also impact the life cycle and impedance characteristics of the battery. Many researchers have investigated the impact of pulse charging on lithium-ion batteries. However, the combined impact of duty cycle and frequency of the pulse charge current on lithium-ion polymer batteries is seldom investigated. This work presents a pulse charger design based on battery polarization characteristics for the Internet-of-Things (IoT) applications. It further proposes an optimization approach, the Taguchi orthogonal arrays (OA), to search for optimal pulse charging parameters that will maximize battery charge and energy efficiencies while decreasing charge time. The same approach is used to determine the impact of the pulse charge current factors on the life cycle of lithium-ion polymer batteries and their impedance parameters. Experimental results verify that the proposed pulse charger designed for IoT applications reduces the charging time of 100 mAh and 45 mAh li-ion batteries respectively by 37.35% and 15.56% and improves the charge efficiency by 3.15% and 3.27% when compared to the benchmark constant current-constant voltage (CC-CV) charging technique. The pulse charger using optimal parameters obtained from the Taguchi OA approach was compared with the benchmark CC-CV charging technique. This resulted in a charge time reduction of 47.6% and battery charge and energy efficiencies improvement of 1.5% and 11.3% respectively, at a charge rate of 0.5C. Life cycle also increased by more than 100 cycles.
electrochemical impedance spectroscopy
Amano-Boadu, Judy Marian (2018). The Search for Optimal Pulse Charging Parameters and the Impact of These Parameters on Lithium Ion Batteries. Doctoral dissertation, Texas A & M University. Available electronically from
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