National Repository of Grey Literature 104 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Electric drives in commercial vehicles and buses
Bahenský, Štěpán ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This bachelor thesis focuses on electric and hybrid powertrains, which are used in utility vehicles and buses. According to this bachelor thesis is divided into two main parts. The first part deals with pure electric drives and its basic components. The subchapters describe various types of engines that are commonly used, but also the features and technologies of batteries. The second part deals with hybrid technologies, division according to the arrangement of components in vehicles, advantages and disadvantages of these solutions. Attention is also paid to the possibilities of battery systems. At the end of both parts, there are examples of commercial vehicles and buses with appropriate motorization, their comparison with competing models and a list of chosen technical parameters. The final chapter summarizes the current direction of the market and its further possible development in the future.
Alandering Of Li-Ion Electrodes And Its Im-Pact On The Final Capacity Of Lithium-Ion Cell
Svoboda, Lukáš
There is an effort to produce lithium-ion batteries with maximal density of energy, or higher capacity of cell with the same size. Calendaring of electrodes is important part of manufacturing of batteries. Its parameters, mainly the pressure of calendaring and with it related the final compression ratio of electrode layers, affect parameters of battery significantly. It is the process of pressing electrode material coated on current collector with certain pressure and it reduces its porosity and thickness. The aim of this article is determination of suitable level of calendaring that increases specific capacity, but does not reduce its cyclability.
Electrochemical Properties Of Lithium-Ion Battery Under Elevated Temperature
Kulíková, Barbora
This article presents a topic of the elevated temperature influence on lithium-ion accumulators. The theoretical part of the paper focuses on the basic principles of lithium-ion batteries, their advantages and influence of the temperature on their functionality. The experimental part deals with three different experiments comparing measured and manufacturers’ parameters, and examining the influence of the temperature and current on a capacity along with charging and discharging characteristics.
Kohoutovice - city district of three centers
Formánková, Anna ; Tichý, Jan (referee) ; Pavlovský, Tomáš (advisor)
The work in the introductory part briefly outlines the historical and current development of the Kohoutovice district in terms of historical events and urban development. Subsequently, the work focuses on a detailed analysis of the three potential centers of this city district. Each center is evaluated on the basis of predetermined criteria that describe the relationship of the selected centers to their visitors. The analyzed criteria are then evaluated and compared in order to select the most suitable of the three solved areas for building a full-fledged cultural core of the municipality and a cultural background for the Kohoutovice citizens with regard to the future urban development of the municipality.
Study of life cycle of the accumulators
Babieska, Lukáš ; Binar, Tomáš (referee) ; Kazda, Tomáš (advisor)
This bachelor work deals with monitoring the life cycle of a lithium-ion battery. The theoretical part describes the history and development of electrochemical cells. Lithium-ion batteries are a separate chapter. There are described their principles, the most used materials for the production of negative and positive electrodes, loading characteristics and the influence of temperature. In the practical part, the influence of temperature on changes of internal impedance, cell capacity and efficiency of energy supply during the battery life cycle is monitored.
Evaluation Of Temperature Influence on Lithium-ion Battery Properties
Zachová, Zuzana ; Libich, Jiří (referee) ; Bača, Petr (advisor)
This diploma thesis deals with monitoring of the influence of temperature on the properties of lithium-ion batteries, especially on the safety and capacity of selected batteries. Chapters 1 and 2 contain a literature review on the subject, describing electrochemical energy sources, especially secondary accumulators, mainly lithium-ion cells. Furthermore, the safety and degradation processes of lithium-ion batteries are discussed and the third chapter describes the design of experiments, realization and outputs of these experiments.
Development of a Small Family Business
Baranyiová, Lucie ; Hrdinová, Lenka (referee) ; Koráb, Vojtěch (advisor)
This bachelor's thesis with the topic "Development of a small family business" will deal with the development of the family restaurant Mazany anděl, located in the city of Brno in the South Moravian region. The intention will be innovations in terms of improvements in the distribution of hot food and bottled wines. The company will be subjected to SWOT analysis, SLEPT analysis, Porter analysis, etc. Conclusion of this work should be the application of improvements and changes in this company.
Synthesis and characterization of sulfurized polymers for electrochemical power sources
Svoboda, Lukáš ; Kazda, Tomáš (referee) ; Čech, Ondřej (advisor)
Batteries based on lithium-sulfur technology have the potential to increase the amount of stored energy in comparison with current lithium-ion systems while maintaining the same weight. Achieving this goal is possible due to the high theoretical energy density of sulfur, which exceeds the values of other materials used in batteries. However, these batteries suffer from several failing, which still hinder the practical use. The use of amorphous sulfur instead of its crystalline form might lead to increasing of durability and charge efficiency. Inverse vulcanization of sulfur seems to be the perspective method for the preparation of polymer sulfur because it prevents its recrystallization and stabilizes amorphous sulfur. The aim of this thesis is the preparation and study of properties of materials made of inverse vulcanized sulfur.
Impact of technological parameters on electrochemical properties of negative electrode in lithium-ion battery
Živčic, Samuel ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This bachelor thesis deals with the issue of li-ion batteries and consists of two main parts. The first part of the thesis deals with a theory. It describes the functionality of electrochemical cells, especially li-ion cells. Operational principle of the cell is discussed, with the main focus given on negative electrode (anode) and the material it consists of, the natural graphite, mainly his electrochemical properties. Last chapter of theory describes expected impact of technological parameters on electrochemical properties of negative electrode. The second part of the thesis is the practical part. First, it describes procedure of making electrodes in laboratory and afterwards it provides an explanation of used measuring methods, steps taken during the measurement, and the results of the measurements. At the end of the thesis, the influence of pressure and layer thickness on electrochemical properties of natural graphite and on capacitive and current characteristics of negative electrode is evaluated.
Capacity meter for Li-Ion and NiMH accumulators
Pinďák, Lukáš ; Cipín, Radoslav (referee) ; Huták, Petr (advisor)
The goal of this bachelor thesis is primarily theoretical analysis of battery problems, analysis tester capacity of Li-ion and NiMH accumulators and its subsequent construction. The work consists of three main. The first part deals with the electrochemical current sources and their division, a brief description of their charging and final comparison commonly most used batteries. The second part of the thesis is already focused on the practical design of the capacity meter. In this section is explained the issue of measuring voltage, current and temperature of the battery and determination of their capacity. The last part describes the device software. The proposed devices allow measurement capacity Li-ion and NiMH cells at three different load modes and can be recharged after discharge.

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