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Solid-state batteries in the automotive industry
Sechovec, Michal ; Otipka, Václav (referee) ; Rekem, Jakub (advisor)
The bachelor's thesis deals with the issue of traction batteries for electric vehicles. The work can be divided into two major parts: Li-ion batteries with liquid electrolyte and batteries with solid electrolyte. It describes the construction, from electrode materials through the electrolyte to the shapes of the cells and the overall battery pack. It also focuses on current developments and includes a summary of the most used electrode materials today. In the area of solid electrolyte, three groups of materials can be discussed. Prospective combinations of solid electrolytes and electrode materials are mentioned. Further research is necessary before any of the discussed concepts can be introduced to the market. Batteries with solid electrolyte are very promising due to their properties.
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Design of a measurement circuit for electrochemical cells cycling in SEM chamber
Tran, Quoc Bao ; Trochta, David (referee) ; Klvač, Ondřej (advisor)
This diploma thesis deals with the design of a measurement circuit consisting of two separate modules for measuring electric current in the order of nanoamperes (nA) for the in-situ analysis of lithium-ion cells in microscopic dimensions. The aim of this thesis is to build a prototype measurement circuit to solve the electromagnetic interference (EMI) problems associated with in-situ analysis and to perform subsequent testing of this circuit or modules. The diploma thesis is divided into two parts, namely a theoretical and an experimental part. In the theoretical part, research on electrochemical cells is described, where the focus is directed towards lithium-ion cells. The principle of the function of these cells is described and research on their degradation mechanisms has also been carried out. Furthermore, the testing methods of lithium-ion cells such as GCPL, OCV and CV have been described. In the theoretical part, the in-situ experiments already performed at Thermo Fisher Scientific Brno are described. One experiment consisted of assembling an electrochemical cell on a MEMS chip and the other experiment was performed using a micromanipulator as a current collector. Measured data were affected by electromagnetic interference. The practical part discusses the design of a measurement circuit that would theoretically solve the problems of measuring very small currents from an EMI perspective. It also describes how the measurement circuit was tested.
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Spot Welding Machine for Li-ion Battery Cells
Martinček, Martin
This article describes creation of spot welding machine prototype. Spot welding enables joining bigger number of Li-ion cells in order to create higher energy storage. Main objective of this article is to design diagrams and algorithms for the spot welding machine. Requirements to regulate current and minimize heat stress on battery cells are implemented in the solution.
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Welder for lithium batteries
Martinček, Martin ; Jaššo, Kamil (referee) ; Vyroubal, Petr (advisor)
This Bachelor’s Thesis deals with the composition of lithium batteries, lithium cell joining, and the design of a device customised for contacting an 18650-size cylindrical cell. The first part discusses the construction, basic materials of the lithium batteries and their applications. In the next section, an overview of several methods of cell contacting and their comparison with each other is presented. The last section discusses different parts of the design and construction of the device, working on the principle of spot resistance welding.
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Electric Vehicle Acupack
Huk, Vojtěch ; Šebela, Kamil (referee) ; Janoušek, Michal (advisor)
This bachelor thesis deals with electric vehicle batteries. The battery itself consists of many structural parts that can be made from a variety of materials and assembled in many ways. The first part of this thesis provides an overview of the characteristics a battery should have to achieve the requirements placed on it, and the methods available on the market to meet these requirements. The second part describes in detail the individual components of the battery, including their function and design. Special attention is given to battery cells, describing and comparing the technologies used in them, including graphical representation of this comparison.
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Spot Welding Machine for Li-ion Battery Cells.
Martinček, Martin
This article describes creation of spot welding machine prototype. Spot welding enables joining bigger number of Li-ion cells in order to create higher energy storage. Main objective of this article is to design diagrams and algorithms for the spot welding machine. Requirements to regulate current and minimize heat stress on battery cells are implemented in the solution.
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Welder for lithium batteries
Martinček, Martin ; Jaššo, Kamil (referee) ; Vyroubal, Petr (advisor)
This Bachelor’s Thesis deals with the composition of lithium batteries, lithium cell joining, and the design of a device customised for contacting an 18650-size cylindrical cell. The first part discusses the construction, basic materials of the lithium batteries and their applications. In the next section, an overview of several methods of cell contacting and their comparison with each other is presented. The last section discusses different parts of the design and construction of the device, working on the principle of spot resistance welding.
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