Active balancing method for series battery pack based on flyback converter. Issue 8 (25th November 2020)

• Record Type: Journal Article
• Authors: Xiangwei, Guo; Jiahao, Geng; Zhen, Liu; Kang, Longyun; Xiaozhuo, Xu
• Is Part Of: IET circuits, devices & systems. Volume 14:Issue 8(2020)
• Page Start: 1129
• Page End: 1134
• Publication Date: 2020-11-25
• Subjects: primary cells -- power convertors; active balancing method -- series battery pack -- flyback converter -- lithium battery -- energy vehicles -- high energy density -- low self‐discharge rate -- energy utilisation rate -- battery systems -- internal resistance -- self‐discharge rate -- balancing topology -- converter primary side -- Li; Electronic circuits -- Periodicals; Electronic systems -- Periodicals; 621.381505
• DOI: 10.1049/iet-cds.2020.0008
• Languages: English
• ISSNs: 1751-858X

Abstract

Abstract : Lithium battery has become the main power source of new energy vehicles due to its high energy density and low self‐discharge rate. In the actual use of the series battery pack, due to the internal resistance and self‐discharge rate of batteries and other factors, inconsistencies between the individual cells are unavoidable. Such inconsistencies will reduce the energy utilisation rate and service life of the battery pack, and even endanger the safety of the battery systems. To improve the consistency of the series battery pack, a novel balancing method based on the flyback converter is proposed in this study. The flyback converter with a simple and reliable structure is used to realise the energy transfer between the whole battery pack and any single cell. Compared with the traditional balancing topology, the topology proposed in this study reduces the number of components and the volume of the balancing system, and only needs one set of control signals on the converter primary side, thus reducing the control difficulty. The experimental results show the effectiveness of the novel balancing method.