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Modern motor vehicle batteries
Komárek, Radim ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
In response to pressure from the European Union to reduce emissions, requirements on car manufacturers are increasing, paving the way for a shift from traditional internal combustion engines to electric drives with energy stored in batteries. The battery itself is made up of modules in which battery cells are stored. To get the correct voltage output, the battery modules and the cells in them need to be wired. Where parallel wiring of the cells with serial wiring of the modules is most appropriate. The most commonly used cells are cylindrical and prismatic cells, which are further divided into prismatic cells and pouch cells. Cylindrical designs are suitable for applications where maximum power output is required, while prismatic designs are better in energy efficiency. Thermal management is very important to keep the batteries within a narrow temperature window. Liquid cooling is preferably used, which has an order of magnitude higher efficiency. This thesis focuses on the analysis of these technologies and their impact on the efficiency and lifetime of battery systems in the automotive industry.
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Electronic Cigarette
Brím, Lukáš ; Šteffan, Pavel (referee) ; Junasová, Veronika (advisor)
This bachelor thesis focuses on the design of an electronic cigarette. The thesis describes the parts that make up an electronic cigarette. The whole device is powered by a battery cell that can be charged in the device via a USB connector. The designed device works on the principle of heating a resistive wire in the form of a spiral. The whole device is controlled by a microcontroller, which makes it possible to control the different modes of operation. The device can operate in three modes namely bypass mode, temperature control mode and watt mode. The setting of the modes is done using tactile switches and then the set power or temperature is displayed on the display.
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Electronic Cigarette
Brím, Lukáš ; Šteffan, Pavel (referee) ; Junasová, Veronika (advisor)
This bachelor thesis focuses on the design of an electronic cigarette. The thesis describes the parts that part of an electronic cigarette. The whole device is powered by a battery cell that can be charged in the device via a USB connector. The designed device works on the principle of heating a resistive wire in the form of a spiral. The whole device is controlled by a microcontroller, which makes it possible to control the different modes of operation. The device can operate in three modes namely bypass mode, temperature control mode and watt mode. The setting of the modes is done using tactile switches and then the set power or temperature is displayed on the display.
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Battery waste recycling
Song, Jiyul ; Brummer, Vladimír (referee) ; Jecha, David (advisor)
The bachelor's thesis focuses on methods for recycling batteries and rechargeable batteries. The thesis aimed to describe the possibilities for recycling battery waste and to conduct an experimental study on the drying of battery waste. The research included a review of the history, principles, and classification of batteries and accumulators, which are described in the theoretical section. Additionally, the thesis examined EU and Czech Republic legislation regarding electronic waste recycling. Finally, a practical experiment was conducted, focus-ing on the drying process of battery waste.
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Photovoltaic laptop charger with wireless connectivity
Komár, Josef ; Kratochvíl, Tomáš (referee) ; Kufa, Jan (advisor)
This thesis deals with the design and construction of a photovoltaic charger designed primarily for a laptop. The solar charge controller works using the MPPT (Maximum Power Point Tracking) principle and is controlled by a ESP32 microcontroller. The control algorithm constantly searches for the maximum power point, thus achieving the maximum possible power and efficiency of the PV panel. The produced energy is then stored in the battery system, which has a BMS including protections and cell balancers. The charger includes an adjustable 18 – 22 V output for powering a laptop computer and 5 V output for powering devices via USB. All important parameters (voltages, currents and powers) are sent wirelessly by the charger via Wi-Fi interface.
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Electrode Materials for Sodium-ion Batteries Based on Carbon
Homolka, Tomáš ; Binar, Tomáš (referee) ; Libich, Jiří (advisor)
This diploma thesis focuses on electrode materials for sodium batteries with a particular emphasis on anodes, especially hard carbon. The history of sodium-ion batteries and their operating principle are discussed as well. The project also describes the history of lithium ion batteries, as they share a significant part of their development and operating principle with sodium-ion batteries. In the practical part, measurements of rate capability, capacity and coulombic efficiency of the selected hard carbon are then performed. The sodation method is also tested and the effect of moisture on its properties is further investigated.
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Modeling of temperature phenomena in Li-Ion cells
Grézl, Vojtěch ; Sedlařík, Marek (referee) ; Vyroubal, Petr (advisor)
This thesis deals with the issue of heat generation in Li-ion batteries, which can have a negative impact on the battery properties and functionality. The thesis can be divided into two main parts. The theoretical part focuses on the theoretical description of Li-ion batteries, heat generation, thermal effects, ideal operating temperatures, modelling of these situations, the occurrence of different types of abuse and the consequences that can arise from incorrect or inadequate thermal management. The practical part focuses on the analysis of the results from the discharge temperature measurements for different load values C and the initiation of the effect known as thermal runaway for 18650 Li-ion cell, and then on how to simulate these behavior in the Ansys Fluent.
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Battery monitoring and protection system
Hladík, Jan ; Červinka, Dalibor (referee) ; Knobloch, Jan (advisor)
This work deals with design of battery management system. Requirements for battery management system and its conception is discussed in the first part of the work. System is able to disconnect load or charger from battery using MOS-FET transistors. It measures battery cell's voltages and is capable of passive balancing. Microcontroller is used for data processing and system control. Schematics, printed circuit board layout and control algorithm was designed. Prototype of the battery management system was then manufactured and tested.
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Li-ion Batery Management System
Kratochvíla, Lukáš ; Macho, Tomáš (referee) ; Kopečný, Lukáš (advisor)
This thesis is about systems for Li-ion batteries. The system consists of measuring and charging. The main part of system is 3 to 5-Series Cell Li-Ion and Li-Phosphate Battery Monitor chip BQ76920. The result of this thesis is printed circuit board (PCB) with BQ76920 and a box contain PCB and battery pack. Box is designed for robot KAMBOT. The system has been tested and measured and evaluated in this thesis.
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Effect of temperature on electrochemical parameters of Li-S battery
Bečan, Jan ; Skala, Kateřina (referee) ; Jaššo, Kamil (advisor)
This bachelor's thesis deals with the production of lithium-sulfur battery and the effect of changing temperatures on its electrochemical parameters. The theoretical part is focused on primary and secondary batteries and their historical evolution, anode and cathode materials for lithium-ion batteries and next-generation batteries. The practical part is focused on preparing the electrode material for lithium-sulfur battery, completion of electrochemical cell and measuring the values of cycling charge/discharge at different temperatures.
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