Abstract
This paper proposes a discharging scenario for a battery power bank configured by battery power modules (BPMs) connected in series. Each BPM in the power bank is formed by a lithium-ion battery pack with an associated buck-boost converter. Charge equalization among batteries can be executed by controlling the battery currents in accordance with the real-time estimated state-of-charges (SOCs) by the coulomb counting method. By accounting for battery capacity degradation, the SOCs can be estimated more precisely by identifying the maximum releasable charges of the batteries. Experimental tests are carried out on a laboratory battery power bank with four BPMs to demonstrate that effectiveness of the discharging scenario on charge equalization and output voltage regulation.
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