Active balancing system based on multiple flyback converters for serially connected lithium battery
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Abstract
This paper proposes the multiple switches-multiple flyback converters (MSMF) with an optimal algorithm of simultaneous equalization of two selected battery cells for equalizing unbalanced voltage of individual cell connected in series. Experimental results show that the proposed system achieves to equalize 24V/25Ah of a battery pack consisted of eight battery cells until the individual cell voltage has the final different value with each other less than 10mV. The MSMF achieves 40% of balancing time reduction compared to a single cell equalization algorithm. Each flyback converter can extract the maximum current from an individual cell approximately 8 A.
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