A Fast Multi-Switched Inductor Balancing System Based on a Fuzzy Logic Controller for Lithium-Ion Battery Packs in Electric Vehicles

Xiudong Cui,Cungang Hu,Yunlei Zhang,Weixiang Shen

doi:10.3390/en10071034

Xiudong Cui, Cungang Hu + Show 2 more

Open Access

PDF Available

https://doi.org/10.3390/en10071034

Copy DOI

Export

Save

Cite

Journal: Energies	Publication Date: Jul 19, 2017
Citations: 25	License type: CC BY 4.0

Affiliation: Swinburne University of Technology, Anhui University

Abstract
Highlights/Summary
Full-Text PDF
Similar Papers

Abstract

Listen

Based on a low cost multi-switched inductor balancing circuit (MSIBC), a fuzzy logic (FL) controller is proposed to improve the balancing performances of lithium-ion battery packs instead of an existing proportional-integral (PI) controller. In the proposed FL controller, a cell’s open circuit voltages (OCVs) and their differences in the pack are used as the inputs, and the output of the FL controller is the balancing current. The FL controller for the MSIBC has the advantage of maintaining high balancing currents over the existing PI controller in almost the entire balancing process for different lithium battery types. As a result, the proposed FL controller takes a much shorter time to achieve battery pack balancing, and thus more pack capacity can be recovered. This will help to improve the pack performance in electric vehicles and extend the serving time of the battery pack.

Highlights

The wide usage of gasoline vehicles leads to the massive emission of greenhouse gases such as carbon dioxide
It mainly consists of a multi-switched inductor balancing circuit (MSIBC) and a fuzzy logic (FL) controller
The FL controller is implemented in the National Instruments (NI) data acquisition platform and the FPGA module

Summary

Introduction

The wide usage of gasoline vehicles leads to the massive emission of greenhouse gases such as carbon dioxide. The voltage of a single cell is typically less than 4.2 V They are usually connected in series to achieve high voltage output (around 300 V) and meet the power requirements of EVs. They are usually connected in series to achieve high voltage output (around 300 V) and meet the power requirements of EVs Such series connection may lead to a voltage or state of charge (SOC) imbalance over long periods of charging and discharging operation since the cells in the pack have different self-discharge rates and charging and discharging efficiencies. In such an imbalanced battery pack, the weakest cell determines the pack capacity. A balancing system is required to improve the pack capacity

Methods

Results

Conclusion