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Research on reconfigurable topology layered equalization method based on maximum capacity utilization
1School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan, China.
Plos One
|December 14, 2023
Summary
Battery imbalance limits electric vehicle range. A novel reconfigurable topology and hierarchical balancing strategy enhance battery pack capacity utilization by 15.93%, improving electric vehicle driving range.
Area of Science:
- Electrical Engineering
- Energy Storage Systems
- Power Electronics
Background:
- Battery imbalance is a critical issue limiting the usable capacity and driving range of electric vehicles (EVs).
- Existing battery balancing methods often require complex DC-DC converters or are inefficient.
Purpose of the Study:
- To propose a novel hierarchical balancing strategy combined with a reconfigurable topology for electric vehicle battery packs.
- To maximize battery pack capacity utilization and enhance EV driving range without a DC-DC converter.
Main Methods:
- Utilizing a four-switch reconfigurable topology allowing flexible cell connection, bypassing, and paralleling.
- Implementing a hierarchical balancing strategy with inter-module K-means clustering and intra-module splitting and recombination.
- Validating the approach on an 8-battery module.
Main Results:
- Achieved full cell balance and maximum battery pack capacity utilization.
- Increased battery pack capacity utilization by 15.93%.
- Maintained a low maximum fluctuation rate of battery pack terminal voltage at 0.9%.
Conclusions:
- The proposed hierarchical balancing strategy with a reconfigurable topology effectively addresses battery imbalance in EV packs.
- This method enhances EV driving range by maximizing battery capacity utilization and ensuring stable voltage performance.
- The system operates efficiently without the need for a DC-DC converter.
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