Cell Level Power Electronics for Better Battery Management System

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/245421
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Type: Examensarbete för masterexamen
Master Thesis
Title: Cell Level Power Electronics for Better Battery Management System
Authors: Gorantla Narayana Murthy, Sri Vishnu
Abstract: In this master thesis, a comparison between two types of battery packs for Electric Vehicles (EVs) is made. Pack 1 is a conventional cells battery pack where all the cells are connected in series. Pack 2 is an autonomous cells battery pack whose cells are equipped with individual micro DC-DC converters. Pack 1 is compared against Pack 2 for energy output (kWh), charging characteristics and ageing. The comparison is performed for two different driving profiles the New European Drive Cycle (NEDC) and a tested and modelled use case. The DC-DC converter makes Pack 2 the autonomous cells battery pack even though the cells are the same. The DC-DC converter ensures load management on individual cell level. Load balancing leads to several advantages in the energy output, charging characteristics, slower ageing rate and susceptibility to capacity spread of the cells forming the battery pack. The battery pack performances are analysed and compared to show that the performance of Pack 2 is better for both NEDC and use case driving profiles. A final sensitivity analysis comparing the battery pack ageing is performed for various use cases thus, giving the holistic view of the advantages in the technology used.
Keywords: Elkraftteknik;Electric power engineering
Issue Date: 2016
Publisher: Chalmers tekniska högskola / Institutionen för energi och miljö
Chalmers University of Technology / Department of Energy and Environment
URI: https://hdl.handle.net/20.500.12380/245421
Collection:Examensarbeten för masterexamen // Master Theses



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