INVESTIGATION AND DESIGN OF AN ACTIVE CELL BALANCING SYSTEM FOR LI-ION BATTERIES

Abstract

A type of active battery cell balancing system based on buck-boost converters is proposed in this study. By using equivalent circuit model of the battery cells, proposed active balancing circuit is examined in detail. An algorithm is developed to actively control the balancing operation. The algorithm is also utilized to prevent any failures in the balancing operation. The proposed system is simulated under low and heavy load. The simulation results indicates that 25 mV imbalance between potentials of two battery cells can be balanced out in approximately 147 seconds under low load and in 127 seconds under high load.

Keywords

• Lithium-ion Battery,Cell Balancing,Battery Management System,Active Cell Balancing,Buck Boost Converter

Lİ-İYON BATARYALAR İÇİN AKTİF HÜCRE DENGELEME SİSTEMİ İNCELEMESİ VE TASARIMI

Abstract

Bu çalışmada lityum iyon bataryalar için gerilim azaltan-arttıran dönüştürücü tabanlı bir aktif hücre dengeleme sistemi önerilmektedir. Aktif hücre dengeleme devresi batarya hücreleri için eş değer devre modeli kullanılarak detaylı olarak incelenmiştir. Dengeleme işlemini aktif olarak kontrol eden bir algoritma geliştirilmiştir. Algoritma dengeleme sürecinde oluşacak hataları önleyecek şekilde tasarlanmıştır. Önerilen sistemin düşük ve yüksek yük altında çalışma durumları için benzetimi yapılmıştır. Benzetim sonuçlarına göre farklı şarj durumlarındaki iki hücre arasındaki 25 mV’luk fark düşük yük altında yaklaşık olarak 147 saniyede, yüksek yük altında 127 saniyede dengelenmektedir.

Keywords

• Li-iyon Batarya,Hücre Dengeleme,Batarya Yönetim Sistemi,Aktif Dengeleme,Azaltan Arttıran Dönüştürücü

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