Open Access

ARTICLE

Design of Voltage Equalization Circuit and Control Method for Lithium-ion Battery Packs

by Qi Wang^1,2,3, Lantian Ge^1,*, Tianru Xie¹, Yibo Huang¹, Yandong Gu¹, Tao Zhu¹, Xuehua Gao¹

1 School of Electrical and Information Engineering, Jiangsu University of Technology, Changzhou, 213001, China
2 Research and Development Department, Shuangdeng Group Co., Ltd., Taizhou, 225500, China
3 School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China

* Corresponding Author: Lantian Ge. Email:

(This article belongs to the Special Issue: Advanced Modelling, Operation, Management and Diagnosis of Lithium Batteries)

Energy Engineering 2025, 122(2), 733-746. https://doi.org/10.32604/ee.2024.059453

Received 08 October 2024; Accepted 15 November 2024; Issue published 31 January 2025

Abstract

The active equalization of lithium-ion batteries involves transferring energy from high-voltage cells to low-voltage cells, ensuring consistent voltage levels across the battery pack and maintaining safety. This paper presents a voltage balancing circuit and control method. First, a single capacitor method is used to design the circuit topology for energy transfer. Next, real-time voltage detection and control are employed to balance energy between cells. Finally, simulation and experimental results demonstrate the effectiveness of the proposed method, achieving balanced voltages of 3.97 V from initial voltages of 4.10, 3.97, and 3.90 V. The proposed circuit is simple, reliable, and effectively prevents overcharge and overdischarge.

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Keywords

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