Abstract

The operation of a battery power bank with series-connected buck–boost-type battery power modules (BPMs) was investigated in this study. Each BPM consisted of a battery pack with an associated buck–boost converter for individually controlling battery currents. With a proposed discharging scenario, load voltage regulation with charge equalization among batteries was performed by controlling the battery currents in accordance with their state-of-charges (SOCs) estimated by real-time battery-loaded voltages detected under the same operating condition. In addition, the fault tolerance was executed to isolate exhausted or faulty batteries from the battery power bank without interrupting the system operation. Experiments were conducted to verify the effectiveness of the discharging scenario for a laboratory battery power bank with four series buck–boost BPMs.

Highlights

  • This paper focuses on the discharging operation a battery power bank with bidirectional performing charge

  • A laboratory power bank is exhausted or abnormal battery from the battery power modules (BPMs) by removing the gate signal to the with a proposed discharging scenario to demonstrate the performances of charge equalization, load corresponding active power switch without the need for additional devices [12]

  • The currents flowing through the equivalent configuration, the inductor current of a BPM is branched into the capacitor current and the output configuration, the inductor current of a is branched into the capacitor current and the output series resistances (ESRs) of the output capacitors result in additional losses, leading to slight current when its auxiliary power switch is turned on

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Summary

Introduction

In the last two decades, the operating performances and the lifespan of the rechargeable battery have been significantly improved due to the growing advancements in battery materials and technologies. The battery charging continuous conduction mode (CCM) and the discontinuous conduction mode (DCM) was analyzed currents are regulated in accordance with their ongoing SOCs accumulated by the coulomb counting in [13], in which a much higher output voltage was batteries. A laboratory power bank is exhausted or abnormal battery from the BPM by removing the gate signal to the with a proposed discharging scenario to demonstrate the performances of charge equalization, load corresponding active power switch without the need for additional devices [12]. Battery power bank is set up with a proposed discharging scenario to demonstrate the performances of charge equalization, load voltage regulation, and fault tolerance with experimental results

The Battery
Circuit Operation
Balanced Discharging Scenario
Fault Tolerance
Experimental Verifications
Battery
13. Isolating transients
Findings
Conclusions and Discussions
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