The balancing efficiency analysis of the switched-capacity method

doi:10.3969/j.issn.2095-4239.2016.02.015

Abstract

Abstract: For the large-scale energy storage applications, the cells need to be in series/parallel to get the required voltage and capacity. The inconsistency of the cells due to the manufacturing process and using is one of the main factors affecting the service life of energy storage unit. In the charging and discharging process of battery for long-term energy storage applications, the difference of the voltage of cells will gradually become larger, leading to the fading of battery or even failure. Various kinds of equalization circuits are applied to reduce the influence of battery inconsistency. In this paper, a comparison of several kinds of commonly used battery equalization circuit, including the energy dissipation balance circuit and non-dissipative equalization circuit was made, emphasizing on the working principle of the switched-capacity method and analyses its efficiency. It is noted that the balance efficiency of the switching capacitor method is related to the initial state of the battery and not to the capacitance values of the capacitor.

Key words: battery energy storage, equalization circuit, switched-capacitor, balancing efficiency

CLC Number:

TM911

ZHANG Minji, SUN Yangzhou, LIANG Jia, ZHAO Yujie, LING Zhibin. The balancing efficiency analysis of the switched-capacity method[J]. Energy Storage Science and Technology, 2016, 5(2): 222-227.

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