Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 33, Issue 11, Pages 9631-9646Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2017.2787909
Keywords
Battery equalizers; battery management systems (BMSs); electric vehicles (EVs); modularization; switched capacitors (SCs)
Categories
Funding
- Key Project of National Natural Science Foundation of China [61633015]
- Major Scientific Instrument Development Program of the National Natural Science Foundation of China [61527809]
- Joint Funds of the National Natural Science Foundation of China [U1764258]
- Development Program of Shandong Province [2016ZDJS03A02]
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Due to the adjacent cell-to-cell equalization, the classical switched-capacitor equalizer (SCE) has seriously low balancing speed and efficiency for a long battery string. Therefore, a series of star-structured switched-capacitor equalizers are proposed to achieve high balancing speed and efficiency independent of the cell number and the cell voltage distribution without significant influences on the size, cost, control, and reliability compared with the classical SCE. The proposed topologies use the least MOSFETs and capacitors to achieve the most direct balancing paths between any two cells, being the optimal switched-capacitor structures. An analysis method for the slow switching limit and the fast switching limit impedances of the proposed equalizers is proposed to provide a theoretical guidance for the selection of the switching frequency. The inherent advantages of the proposed systems are the small size, low cost, simple control, high efficiency, fast speed, easy modularization, and high reliability. A prototype for four lithium-ion battery cells is set up. Experimental results show improved balancing performances with strong robustness. Moreover, the measured peak balancing efficiency is about 93.1% despite faster balancing speed.
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