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Advanced methods for monitoring li-ion batteries
Vašíček, Jakub ; Čech, Ondřej (referee) ; Vyroubal, Petr (advisor)
This master’s thesis focuses on advanced algorithms for monitoring the state of lithium-ion cells. The introductory section describes the construction and main parameters of these cells. It is followed by an analysis of conventional methods for determining the State of Charge (SoC) and an overview of their main drawbacks. Subsequently, the most frequently used surrogate models for these cells and the methods for their determination are presented. The following section briefly outlines the techniques for monitoring the State of Health (SoH) of cells. After the theoretical part, there is a chapter dedicated to the measurement of a selected cell using the described methods. This includes both laboratory measurements and practical experiments conducted in a real photovoltaic system. Based on the findings and obtained data, an algorithm allowing determination of the surrogate model of the cell during operation was developed. Furthermore, new hardware components for the BMS, which was designed in the previous bachelor's thesis, are proposed. The aim is to eliminate previous shortcomings, enable the implementation of new algorithms, and integrate the device into the IoT platform. New parts of the firmware are also described, and the entire device is tested. In the concluding part, the results of the implemented changes are evaluated.
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Intelligent BMS for lithium batteries
Vašíček, Jakub ; Kazda, Tomáš (referee) ; Vyroubal, Petr (advisor)
This thesis is focused on design of electronic system called BMS, which is necessary for lithium batteries safety operation. The first part contains a brief description of lithium battery design. The following is an overview of the main parameters of this type of batteries. The next part describing various methods of state of charge (SoC) estimation and the ways to ensure uniform charge of each cell. Based on the theoretic analysis, the block diagrams for individual parts of BMS were designed. The following describing device assembly and design of control algorithm. The last part is devoted to measurement of achieved attributes. In conclusion, results of the work are discussed and possibilities of future improvements are suggested.
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Intelligent BMS for lithium batteries
Vašíček, Jakub ; Kazda, Tomáš (referee) ; Vyroubal, Petr (advisor)
This thesis is focused on design of electronic system called BMS, which is necessary for lithium batteries safety operation. The first part contains a brief description of lithium battery design. The following is an overview of the main parameters of this type of batteries. The next part describing various methods of state of charge (SoC) estimation and the ways to ensure uniform charge of each cell. Based on the theoretic analysis, the block diagrams for individual parts of BMS were designed. The following describing device assembly and design of control algorithm. The last part is devoted to measurement of achieved attributes. In conclusion, results of the work are discussed and possibilities of future improvements are suggested.
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Design and implementation of revisions devices for the treatment of hyperhidrosis
Vejnar, Pavel ; Bradáč, Zdeněk (referee) ; Šedivá, Soňa (advisor)
Thesis deals with the design and realization of revisions devices for the treatment of hyperhidrosis. One of the methods how to treat hyperhidrosis is iontophoresis. This prevents sweating using an electric current. The work is divided on the parts. First part is a theory, which deals with basic principles of treatment. Next part is the analysis of original solutions and hardware design of new solutions. In conclusion I revive device by microcontroller programming and checking its functionality. I was able to create a prototype board, programmable firmware and successfully tested a prototype.
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