Study on SOC equalization control of series-connected liquid metal battery packs

Qiguang Li; Xiaozhong Zuo; Baozhi Chen; Benwen Li

doi:10.1117/12.3032342

19 June 2024 Study on SOC equalization control of series-connected liquid metal battery packs

Qiguang Li, Xiaozhong Zuo, Baozhi Chen, Benwen Li

Proceedings Volume 13172, Ninth International Symposium on Energy Science and Chemical Engineering (ISESCE 2024) ; 131720S (2024) https://doi.org/10.1117/12.3032342
Event: 9th International Symposium on Energy Science and Chemical Engineering, 2024, Nanjing, China

Abstract

To address the problem of inconsistency in the state-of-charge (SOC) of series-connected battery packs that leads to the reduction of the efficiency and lifetime of the battery packs, this paper proposes an active equalization topology based on a buck-boost converter, which controls the state of the inductors through the on/off of switches. The proposed circuit has flexible equalization paths that allow different equalization processes to be performed simultaneously, improving the equalization time efficiency. In this paper, a two-stage equalization control strategy with "variable step" equalization current is proposed, and the range of SOC is used as the equalization object of the battery pack. MATLAB/Simulink software was used to build the model and equalization system for liquid metal batteries (LMBs), and the LMBs were simulated and analyzed in the static state, constant current discharge condition and DST dynamic discharge condition, respectively. The analysis of the simulation results shows that the equalization control system has high equalization efficiency and equalization accuracy, and can effectively improve the consistency of the SOC of LMB packs.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Qiguang Li, Xiaozhong Zuo, Baozhi Chen, and Benwen Li "Study on SOC equalization control of series-connected liquid metal battery packs", Proc. SPIE 13172, Ninth International Symposium on Energy Science and Chemical Engineering (ISESCE 2024) , 131720S (19 June 2024); https://doi.org/10.1117/12.3032342

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KEYWORDS

Batteries

Circuit switching

Control systems

Liquids

Metals

Solids

Lithium

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