|
|
Effect of compaction pressure to the electrochemical properties of the electrodes for Li-S accumulators
Jaššo, Kamil ; Tichý, Jiří (referee) ; Kazda, Tomáš (advisor)
The purpose of this diploma thesis is to describe the impact of compaction pressure on the electrochemical parameters of lithium-sulfur batteries. Theoretical part of this thesis contains briefly described terminology and general issues of batteries and their division. Every kind of battery is provided with a closer description of a specific battery type. A separate chapter is dedicated to lithium cells, mainly lithium-ion batteries. Considering various composition of lithium-ion batteries, this chapter deeply analyzes mostly used active materials of electrodes, used electrolytes and separators. Considering that the electrochemical principle of Li-S and Li-O batteries is different to Li-ion batteries, these accumulators of new generation are included in individual subhead. In the experimental part of this thesis are described methods used to measure electrochemical parameters of Li-S batteries. Next chapter contains description of preparing individual electrodes and their composition. Rest of the experimental part of my thesis is dedicated to the description of individual experiments and achieved results.
|
|
|
Photographic battery flash unit
Dašovský, Jakub ; Kubíček, Michal (referee) ; Kolouch, Jaromír (advisor)
The main subject of this bachelor thesis is the design of a flesh unit with a maximum output performance of 400Ws. Regulation is performed by the length of flash. The source of energy used is generated by Li-Ion cells with a total voltage of 21 V and capacity of 5200 mAh. Part of this design include circuits that provide power control to the flash tube, the resizing of the DC voltage (changing), the charging and monitoring of the minimum battery voltage.
|
|
| |
|
|
USB battery tester
Andrysík, Lukáš ; Langhammer, Lukáš (referee) ; Lattenberg, Ivo (advisor)
This bachelor's thesis contains construction of battery tester along with primary and secondary cells comparsion. It consists of four parts - the first one focuses on general description of the most commonly used electrochemical cells, their characteristics, advantages and disadvantages. Second one relates to design a custom equipment for testing these cells including software, parts values calculations and common problems with the design. Third part is mainly about mechanical design and PCB manufacture. The last section is devoted to comparsion of several models of cells in terms of capacity and performance under different conditions.
|
|
|
Backup power supply with solar panel charging
Křepela, Pavel ; Götthans, Tomáš (referee) ; Kubíček, Michal (advisor)
This project aims to create a backup power source with solar charging for small mobile devices (through USB connector). The charger should store power in a battery that is charged either from external power source or the solar panel. In the introduction, the work deals with the theory of solar cells and batteries. Furthermore, it described the selection of suitable components and design diagram.
|
|
|
Processor controlled backup power supply
Hořák, Jan ; Štraus, Pavel (referee) ; Kubíček, Michal (advisor)
This thesis describes the design of a processor controlled small battery backup power supply. The aim is to design a device which can recharge many kinds of mobile devices with a battery capacity up to 2Ah. The main control element is a microprocessor that records operating data of the power supply and stores in onto an SD card. Portability and durability were taken into account during the design. The result is completely designed and build a backup power supply, including program for its microcontroller.
|
|
| |
|
|
Energy harvesting in wireless sensor networks
Pačinek, David ; Kučera, Pavel (referee) ; Hynčica, Ondřej (advisor)
This Bachelor's thesis is dedicated to the power of wireless sensors for use of alternative sources of supply, which is solar energy. The thesis performed on description of photovoltaic panels, availible batteries and their charging. The bachleor's thesis also shows the design and implementation of the circuitry for solar battery charger and datalogger consisting of a microcontroller and GSM module.
|
|
|
Embedded System with Communication Interface NFC and Wi-Fi
Bugár, Loránt ; Valach, Soběslav (referee) ; Horák, Karel (advisor)
This master’s thesis deals with communication system design via the NFC and Wi-Fi interface. The thesis has two basic goals. The first goal is to create a device that is capable of storing of data and its subsequent transfer via the NFC interface. The second aim is to utilize this device for measuring various physical variables. The IoT technology is employed to fulfill the aforementioned goal. IoT technology is capable of visualizing data in real time and make them accessible via the Internet. The result of this work is an universal device, that contains the most popular communication interfaces, such as I2C, SPI and that is capable of processing measurement data from digital, analogue, and wireless sensors.
|
|
|
Materials and Components for Lithium-Ion Power Sources
Jirák, Tibor ; Kadlec, Jaromír (referee) ; Paidar,, Martin (referee) ; Vondrák, Jiří (advisor)
The dissertation thesis deals with electrode materials and components for lithium-ion power sources. The thesis works with two different kinds of materials, concretely nanostructured Li4Ti5O12 with spinel basis and LiCoO2 with layered structure. The electrochemical properties, structure and element analysis and utilization possibilities in electrochemical industry of new technological electrode material Li4Ti5O12 were investigated. The influences of admixtures and electrolytes on characteristics of electrode materials with aforesaid active masses were also examined. Low cost price, environmental safety and obtained results of electrochemical measurements and structure analysis refer to wide possibilities of usage electrode material Li4Ti5O12 in the field of electrochemistry.
|
guest ::
