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Spurred evolution in hybrid electric vehicles (HEVs) and electric vehicles (EVs) development, over the last decades, imposed the Li-ion battery (LIB) as the preferred energy storage element. Ever since, the accurate assessment of the LIB state-of-charge (SOC) during the demanding EV operation regimes posed serious challenges. Hence, several methods were developed in order to estimate the available...
Efficacious work of the Li-ion battery (LIB) is strongly influenced by several factors as temperature, nominal voltage, capacity and charge/discharge current rate, determining its health and state-of-charge (SOC). SOC is an indicator mirroring the available charge stored in the battery relative to its maximum capacity when new, resembling the fuel gauge in the conventional, internal combustion engine...
This paper sets forth the design of a soft-switched bi-directional DC-DC converter for charge balancing control of Electric Vehicle (EV) application-specific Li-ion battery strings. A high efficiency phase shifted full bridge converter steps down the pack voltage in order to charge one cell at a time, while a push-pull converter boosts the voltage of one individual cell to meet the charging voltage...
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