|
|
Voltage converter with MPPT algorithm for solar cell
Špina, Martin ; Pazdera, Ivo (referee) ; Huták, Petr (advisor)
This thesis deals with design of solar lithium ion battery charger using microcontroller controlled step down DC/DC converter. Control algorithm is designed to utilize most the of the energy coming from the solar photovoltaic panel, by using maximum power point tracking technology. This makes it as efficient as possible at any irradiation intensity level or temperature.
|
|
|
Resistive Heating System for Work Shoes
Pár, Lukáš ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This bachelor thesis deals with the design of a device for the resistive heating of work-shoes, the circuits of a power converter for a heater and the battery-pack. Two variants of the heater are designed in the first part of thesis. Thesis continues with design of DC/DC converters for both types of the heater. Next part of the thesis deals with a design of the battery-pack with simple BMS circuits. The design of the control circuit for selected DC/DC converter follows. Next part of thesis deals with the construction of the device. Last part is dedicated to measurements and verification.
|
|
|
Dynamic Li-ion battery model
Loucký, Vojtěch ; Cipín, Radoslav (referee) ; Toman, Marek (advisor)
The main aim of this work is to compare mathematical models of Li-Ion batteries and for the chosen mathematical model create dynamic model in MATLAB. Different mathematical models are compared based on their weakness. There is detailed description of Improved Thevenin model, which is then created in Simulink and is tested for various discharging currents. This model is adjusted to work with parameters obtained from measuring data on real Li-ion cell and the results from simulations are compared with results from real measurements.
|
|
|
Determination of the most suitable ratio of cathode materials for the lithium-sulfur battery system
Benešová, Petra ; Kazda, Tomáš (referee) ; Jaššo, Kamil (advisor)
This master's thesis deals with a topic of determination of the most suitable ratio of cathode materials for the lithium-sulfur systems. The first two chapters provide a general introduction to the topic of electrochemical energy sources and present the commonly used primary and secondary battery systems with emphasis on their characteristics and applications. The core of the theoretical part is dedicated to lithium-ion and lithium-sulfur batteries, their working principles along with the benefits or drawbacks related to the particular systems, and widely used materials. The experimental part briefly comments on determining the suitable electrode paste preparation method, the subsequent main part is focused on evaluation of electrochemical performance of cells using different ratios of cathode materials. Five samples of cathode materials were prepared, where the sulfur ratio is in range from 64 to 88 wt. %. Finally, the comparison of all prepared ratios in terms of their electrochemical properties is provided.
|
|
|
Electrolytes containing a phosphorus-based flame retardant
Pelikán, Ondřej ; Libich, Jiří (referee) ; Máca, Josef (advisor)
The diploma thesis is focused on the theoretical knowledge of lithium accumulators. More attention is given to electrolytes and especially to flame retardants, where the types and individual examples of flame retardants are described more detailed. The practical part is focused on the individual laboratory measurement of selected samples of electrolytes with different flame retardants. The measurement results are analyzed in other parts.
|
|
|
Možnosti recyklace Li-Ion akumulátorů
Skala, Kateřina ; Tichý, Jiří (referee) ; Kazda, Tomáš (advisor)
This diploma thesis is concerned with topic of lithium-ion batteries recycling. In this document the particular methods containing commercial used recycling processes or only laboratory used processes are discussed. Because rising amount of spent Li-ion accumulators is necessary find proper methods to recycle this type of accumulators. Also legislation question of this issue is important. In practical part is described procedure and results performed recycling method.
|
|
|
Battery management system for Formula Student
Macko, Maroš ; Bohrn, Marek (referee) ; Šteffan, Pavel (advisor)
This thesis is focused on battery management for Formula Student monopost. Part of the work is the design and implementation of this monitoring system. The system uses a distributed topology, is divided into the main subsystem and subordinate subsystems. The main subsystem and the selection of suitable components are described. Furthermore, subordinate subsystems are designed, and the fundamentals of battery voltage and temperature measurement are explained. Control firmware is implemented and it is able to communicate with the rest of the car. All systems were tested and they comply with the rules of the Formula Student competition.
|
|
|
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.
|
|
|
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.
|
|
|
Modelling of lithium ion batteries using ECM
Langer, Lukáš ; Kazda, Tomáš (referee) ; Vyroubal, Petr (advisor)
The main aim of this paper are models of Li-Ion storage batteries made and simulated in ANSYS Fluent software. Various ways of simulations are discussed with main aim on ECM method and how its numerical model is computed. A process of getting information and required data from real battery to be compared with simulation results by EIS method is also discussed. These results are then compared with results from ANSYS Fluent.
|
guest ::
