Design of a Bi-directional Flyback Converter for Electric Vehicle Battery Active Balancing Systems

Year 2022, , 1487 - 1494, 16.12.2022

Fatih Şahin , Elif Kılınç

https://doi.org/10.2339/politeknik.912393

Cited By: 1

Abstract

The battery balancing systems are essential for balanced charging and discharging the battery cells. Lifecyle, efficiency and safety of battery packs can be increased by balancing systems. Battery balancing systems are divided into two group as passive and active. In passive balancing systems the amount of charge causing imbalance between cells is discharged by a resistor while in active balancing sytems imbalance between the cells is eliminated by transferring energy from high state of charge cell to low one. Increasing number of cells is led to complexity of balancing systems. Converter based balancing systems present a feasible solution to battery packs with a large number of cells. In this study, a bidirectional flyback converter in order to use in battery active balancing systems has been developed. Simulation and test results revealed that the developed bidirectional flyback converter is suitable for battery active balancing systems. The highest efficiencies were obtained as 67.84% at 32.5% duty cycle at charge test and 66.02% at 50% duty cycle at discharge test.

Keywords

Battery balancing system, active balancing, bi-directional flyback converter

Elektrikli Araç Batarya Aktif Dengeleme Sistemleri için Çift Yönlü Flyback Dönüştürücü Tasarımı

Abstract

Batarya dengeleme sistemleri batarya hücrelerinin dengeli şarj ve deşarjı için gereklidir. Batarya paketlerinin ömrü, verimliliği ve güvenliği dengeleme sistemleri ile artırılabilir. Batarya dengeleme sistemleri pasif ve aktif olarak ikiye ayrılır. Pasif dengeleme sistemlerinde, hücreler arasında dengesizliğe neden olan yük miktarı bir dirençle boşaltılırken, aktif dengeleme sistemlerinde hücreler arası dengesizlik, enerjinin yüksek şarjlı hücreden düşük olana aktarılmasıyla ortadan kaldırılır. Artan hücre sayısı, dengeleme sistemlerinin karmaşıklığına yol açmaktadır. Dönüştürücü tabanlı dengeleme sistemleri, çok sayıda hücreye sahip batarya paketleri için uygun bir çözüm sunar. Bu çalışmada, batarya aktif dengeleme sistemlerinde kullanılmak üzere çift yönlü bir flyback dönüştürücü geliştirilmiştir. Simülasyon ve test sonuçları, geliştirilen çift yönlü flyback dönüştürücünün batarya aktif dengeleme sistemleri için uygun olduğunu ortaya koymuştur. Hücre şarj yönü testinde en yüksek verim %32,5 görev döngüsünde %67,84 olarak ve hücre deşarj yönü testinde %50 görev döngüsünde %66,02 olarak elde edilmiştir.

Keywords

Batarya dengeleme sistemi, aktif dengeleme, çift yönlü flyback dönüştürücü

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