Modularized Equalization Architecture With Transformer-Based Integrating Voltage Equalizer for the Series-Connected Battery Pack in Electric Bicycles

• Published in: IEEE transactions on industrial electronics (1982) Vol. 70; no. 7; pp. 6984 - 6992
• Main Authors: Xu, Bin, Liu, Lizhou, Yan, Zhaotian, Yuan, Zhuqing, Zhang, Lu, Zhou, Wei, Mai, Ruikun, He, Zhengyou, Liu, Yongpan, Yang, Huazhong
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Batteries; Channels; Computer architecture; DC-DC power converters; Electric bicycles; Electric potential; Energy transmission; Equalizers; Modularized architecture; Modules; multiwinding transformer; Strings; Switches; Topology; Transformers; Voltage; voltage equalizer
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2022.3204947

Due to the electrical isolation, fewer switches, and easy control, the transformer-based integrated equalizer is promising in commercial applications. However, few balance energy transmission channels limit the transformer-based integrated equalizer applied to the long battery string. Therefore, a integrated voltage equalizer with a modularized architecture (MEA-TE) is proposed. The proposed equalizer increases the energy transmission channels, which realizes the balance for the long battery string. The modularized equalizer consists of three parts: the dc-dc converter, the converter-to-module transformer (CMT), and the module-to-cell transformers (MCT). The mosfet in the dc-dc converter drives the CMT, and the CMT drives all the MCTs to balance each cell. The proposed MEA-TE equalizer only uses one mosfet to balance the large battery pack. The MEA-TE platform for eight battery cells is established. The results demonstrate that the MEA-TE equalizer can realize the balance of the large battery pack.