A Modularized Two-Stage Active Cell Balancing Circuit for Series Connected Li-Ion Battery Packs

Kenguru Manjunath, R. Kalpana
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Abstract

This paper addresses a modularized two-stage active cell balancing topology based on an improved buck-boost converter for a series connected Lithium-ion battery string. The proposed topology has a modular structure, each module consisting of three cells, two inductors, and four MOSFET switches. This technique provides module-to-module balancing in the first stage. Moreover, it can simultaneously target and balance two cells in a module in the second stage. Thus, significantly reduces the cell balancing time and increases the system performance with minimal components. The proposed topology has been theoretically analyzed and experimentally verified with a laboratory prototype. The proposed modularization technique is verified experimentally with two modules tested together in a battery string.
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一种用于串联锂离子电池组的模块化两级有源平衡电路
本文提出了一种基于改进的升压变换器的模块化两级有源电池平衡拓扑,用于串联锂离子电池组。所提出的拓扑结构具有模块化结构,每个模块由三个单元,两个电感器和四个MOSFET开关组成。该技术在第一阶段提供模块到模块的平衡。在第二阶段,它可以同时瞄准和平衡一个模块中的两个细胞。因此,显著减少了单元平衡时间,提高了系统性能与最小的组件。对所提出的拓扑结构进行了理论分析,并通过实验室样机进行了实验验证。通过在电池组中对两个模块进行测试,验证了所提出的模块化技术。
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