Performance Optimization of Battery Balancing System using Multi-Stage Method Based on Multi-winding Transformer and Single Inductor Yusiran (a), Trendy Prima Wijaya (b), Andini Jinggan Ayumurti (c), Widya Ayu Salsabila (d), Irsyad Nashirul Haq (e*), Edi Leksono (f), Eko Mursito Budi (g)
(a,b,c,d,e,f,g) Department of Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung, Indonesia
(e) National Center for Sustainable Transportation Technology, Indonesia
*irsyad.n[at]itb.ac.id
Abstract
In this paper, a multi-stage battery voltage balancing method based on multi-winding transformer and single inductor is proposed. A multi-winding transformer is used as a cell-level equalizer and a single inductor act as a module-level equalizer. Multi-winding transformers have advantages in speed and efficiency of the balancing system, however, the number of cells that can be balanced is limited. Hence, the proposed balancing method can overcome the limited number of cells that can be balanced from multi-winding transformers without adding any significant number of components. Other than that, the speed of balancing between modules can be achieved by the presence of a single inductor as a module-level equalizer. A prototype was built to verify that the proposed balancing method can be implemented using 4 battery cells in series connected configuration. The experimental results show that the voltage of the four battery cells reached zero-voltage gap (ZVB) up to 0.05 Volt within 700 seconds with an average balancing current between modules of 200 mA.
Keywords: battery balancing, performance optimization, multi-stage, multi winding transformer, single inductor,
