Battery Management System for the Wireless Powerlizer

Bachelor thesis (2021)

Authors

J.C. van Ammers Electrical Engineering, Mathematics and Computer Science
H. Chen Electrical Engineering, Mathematics and Computer Science

Contributors

J. Dong DC systems, Energy conversion & Storage - EEMCS (mentor)
C. Riekerk DC systems, Energy conversion & Storage - EEMCS (mentor)
I.E. Lager Electrical Engineering Education - EEMCS (graduation committee member)
Thiago B. Soeiro DC systems, Energy conversion & Storage - EEMCS (graduation committee member)
Faculty
Electrical Engineering, Mathematics and Computer Science, Electrical Engineering, Mathematics and Computer Science
Copyright: © 2021 Jeroen van Ammers, Hsukang Chen
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Published Date

29-06-2021

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

To enable the portable use of electronic devices, (rechargeable) batteries need to be used. These batteries require a battery management system in order for them to operate safely and efficiently. This thesis describes such a system for the Wireless Powerlizer: a power bank with wireless charging capabilities and an integrated sterilizer using UV-C light.

The battery management system comprises of a charging circuit, a protection module, and cell balancing features. These features are designed to function with Li-ion batteries, which are chosen for their high volumetric energy density, in a 5S1P configuration. These batteries will be charged via a constant-current, constant-voltage (CC-CV) scheme in order to improve charging speed. This charging scheme will be facilitated by a DC-DC boost converter with current and voltage control.

The mechanism behind the protection module (overcharge, overdischarge, overcurrent, and temperature) and passive cell balancing features are elucidated via flowcharts and also verified by simulation in Simulink. A prototype encompassing the charging circuit is implemented on a PCB and tested. The realized boost converter successfully allows for CC-CV charging: it operates at 263kHz, has a charging current of 1A, a constant voltage boundary of 19.6V, and shows an efficiency of 92—93.6%.