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A Modular Cell Balancer Based on Multi-Winding Transformer and Switched-Capacitor Circuits for a Series-Connected Battery String in Electric Vehicles

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Applied Sciences

MDPI AG

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      Abstract

      In this paper, a cell balancing topology for a series-connected Lithium-Ion battery string (SCBS) in electric vehicles is proposed and experimentally verified. In particular, this balancing topology based on the modular balancer consists of an intra-module balancer based on a multi-winding transformer circuit and an outer-module balancer based on a switched capacitor converter, both offering the potential advantages and over conventional balancing methods, including short equalization time, simple control scheme, elimination of voltage sensors. In addition, a number of cells in the SCBS can be easily extended in this circuit. Furthermore, a system structure and an operating principle of the proposed topology are analyzed and experimentally verified for three different cases. The voltages of all cells in the SCBS reached the balanced state regardless of the various arrangement of the initial voltage, where the energy efficiency of the circuit reached 83.31%. Our experimental realization of the proposed balancing topology shows that such a technique could be employed in electric vehicles.

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      Most cited references 28

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      Quasi-Resonant Zero-Current-Switching Bidirectional Converter for Battery Equalization Applications

       Y-S Lee,  G.-T. Cheng (2006)
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        A Modularized Charge Equalizer for an HEV Lithium-Ion Battery String

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          “Time Shared Flyback Converter” Based Regenerative Cell Balancing Technique for Series Connected Li-Ion Battery Strings

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            Author and article information

            Journal
            ASPCC7
            Applied Sciences
            Applied Sciences
            MDPI AG
            2076-3417
            August 2018
            August 01 2018
            : 8
            : 8
            : 1278
            10.3390/app8081278
            © 2018

            https://creativecommons.org/licenses/by/4.0/

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            Self URI (article page): http://www.mdpi.com/2076-3417/8/8/1278

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