Design of a multi-cell battery charging system

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Supervisor:
Dr. Stumpf Péter Pál
Department of Automation and Applied Informatics

In the last decades, the energy sector is undergoing a transformation that favors green technologies to minimize the pollution and maintain the idea of sustainable development. For that, the role of renewables and the influence of alternative drives are started to grow, however these technologies are inoperable without an effective and clear energy storage. That is why, the development of electrical energy storage systems is one of a top emerging technology, which influences most of our applications nowadays. Unfortunately, in some cases the ways of harvesting the storage systems are immature and needs improvement that can imply a worldwide increase in efficiency and performance. Because of this, the topic of this paper is the current state of battery technology, its benefits, disadvantages, fields of applications and the main development opportunities.

In the first chapter, the most popular electrical energy storage methods are presented with their optimal utilization area. Moreover, the reasons for their indispensability are detailed briefly.

After that, the focus is on the battery technology. Its utilization is highly influenced by the supplement electric circuits, therefore the overall performance can be highly increased by power electronic developments. In order to represent the behavior of the chemical processes in an electric system, an equivalent circuit of a battery cell must be used which is demonstrated in this chapter. Moreover, the optimal charge characteristic is stated that should be maintained for every cell in any accumulator pack to prolong their lifetime.

In the next two chapters, the design of a system is detailed, which can achieve this goal by manage the cells separately. Firstly, the hardware of the device is specified, whose base is the individually operating bidirectional DC/DC converters that define the conditions of the cells one by one. Then, the implementation of the control algorithm and the associated features is described for the selected TI C2000 Launchpad.

The fifth chapter summarizes the expected behavior of the system by the modelling of its components and their interactions in MATLAB Simulink. After, that, the actual operation of the installed system is examined for charging and discharging battery cells.

In the final part, the project’s further planes are summarized and the development opportunities that can make the separate cell management method a real alternative to the traditional accumulator connections.

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