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| Voltage Equalizing Circuit of Series Lithium Battery Based on Multi-Port Transformer |
| Nie Jianglin1, Yang Jiangpeng1, Cai Chunjian1, Sun Xinyu1, Shu Zeliang1,2 |
1. School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China;
2. The Ministry of Education Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle Southwest Jiaotong University Chengdu 610031 China |
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Abstract A series lithium battery pack needs voltage equalization to ensure its life and safety. In this paper, a series voltage equalizing circuit of lithium battery based on multi-port transformer is proposed, which can realize the controllable voltage equalization through active and passive paths. And it can directly control the charging or discharging of specific batteries. Compared with the conventional congeneric methods, it requires no additional circuits. Also, the number of transformer windings and MOSFET is reduced by half. By modeling and analyzing the circuit, the constraint conditions of key parameters such as transformer turn ratio are determined. In addition, predicted voltage and lowest voltage control strategies are proposed based on the traditional average voltage control strategy. Finally, a voltage equalization prototype based on GaN MOSFET and planar multi-port transformer is designed for 24 series battery packs. It is shown that the proposed circuit and control strategies have good voltage equalizing speed and efficiency.
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Received: 25 December 2020
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2021, Vol. 36 
