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Battery Cell Balancer with Active Power Decoupling Function
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DOI：10.23919/icpe2019-ecceasia42246.2019.8797201.png)
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摘要
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Nickel metal hybrid (NiMH) batteries are the most widely used batteries in hybrid electric vehicles (HEVs). Due to an imbalance among the individual cells caused by long-term use in HEV, a large number of NiMH batteries end up as toxic waste. Although the retired batteries cannot be employed as energy storage devices (ESDs) in electric vehicles (EVs) or HEVs anymore, they still have the potential to be reused as an energy source in small-scale distributed generation systems for households. However, the cell balancing operation is mandatory, even for those applications with lower power ratings. Hence, this paper proposes an active cell balancer that equalizes the state of charges (SOCs) of the imbalanced NiMH batteries using a generation control circuit (GCC). Along with the cell balancing circuit, an active power decoupling circuit (APDC) is applied. The purpose of the APDC is to not only achieve minimization of power pulsation caused by single-phase inverter, but also reliability enhancement of the entire system.
Keyword:
State of charge
Active cell balancing
Active power decoupling
Generation control circuit
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