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Design of Power HIL unit for Li-pol cell simulation
Pribulla, Daniel ; Sova, Václav (referee) ; Chalupa, Jan (advisor)
This thesis deals with design and construction of a Li-po cell Power-HIL simulator intended for testing of a small wireless module's powering. The simulator is based on a battery model which includes the influence of temperature and battery degradation on battery parameters. To estimate model parameters a series of tests on real Li-po cell with capacity 250mAh were performed. Charging and discharging tests were performed by different temperatures of the battery. In purpose of this test a simple thermal chamber was constructed. Design of the power electronics of the device was tested in the Simscape library of the Matlab Simulink. The result is a working prototype of the simulator tested for charging and discharging of batteries with capacity in range 100-1500 mAh. The simulator can be controlled with graphical user interface capable of setting the battery parameters and real time observation of the model variables.
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The effect of temperature on the charging and discharging characteristics of lithium-ion batteries
Doleželová, Eva ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This thesis deals with operation principles of lithium-ion batteries, its degradation principles, capacity fade, materials used, formats, main characteristics, development, uses and mid to high temperature behaviour. The thesis aims to study aging characteristics of commercially available lithium-ion batteries. In the practical part of the thesis, the key parameters of selected types of commercially available lithium-ion batteries were measured under normal temperature conditions. The measurement was repeated at an elevated temperature. Results were analysed and effects of different temperatures on the selected characteristics were concluded both verbally and graphically. A conclusion evaluates short-term and long-term impacts of ambient temperature on rate capability, ageing, capacity fade and longevity.
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Fast charging of EV vehicles - overview of technologies
Boršoš, Adam ; Charvát, Pavel (referee) ; Fišer, Jan (advisor)
Charging speed is one of the key parameters that affects the attractiveness of electric cars for drivers. Therefore, it is important to determine the methods that can charge the electric car as quickly as possible. An overview of electric vehicle charging technologies and the identification of those that are considered fast charging has been made. It has been found that the fastest technology is DC charging. A list of six connectors that allow this charging has also been created. These were then compared. An overview of charging networks, that enable fast charging, was made in the next chapter. The three largest providers of charging stations in the Czech Republic and also the two that specialize in fast charging were listed. The topic of battery cooling is also related to charging. Therefore, the following chapter provides an overview of technologies that are used to cool batteries. The last part focuses on the factors that cause the degradation of batteries. An overview of the four main causes of degradation and their effect on the battery was demonstrated.
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Fast charging of EV vehicles - overview of technologies
Boršoš, Adam ; Charvát, Pavel (referee) ; Fišer, Jan (advisor)
Charging speed is one of the key parameters that affects the attractiveness of electric cars for drivers. Therefore, it is important to determine the methods that can charge the electric car as quickly as possible. An overview of electric vehicle charging technologies and the identification of those that are considered fast charging has been made. It has been found that the fastest technology is DC charging. A list of six connectors that allow this charging has also been created. These were then compared. An overview of charging networks, that enable fast charging, was made in the next chapter. The three largest providers of charging stations in the Czech Republic and also the two that specialize in fast charging were listed. The topic of battery cooling is also related to charging. Therefore, the following chapter provides an overview of technologies that are used to cool batteries. The last part focuses on the factors that cause the degradation of batteries. An overview of the four main causes of degradation and their effect on the battery was demonstrated.
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The effect of temperature on the charging and discharging characteristics of lithium-ion batteries
Doleželová, Eva ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This thesis deals with operation principles of lithium-ion batteries, its degradation principles, capacity fade, materials used, formats, main characteristics, development, uses and mid to high temperature behaviour. The thesis aims to study aging characteristics of commercially available lithium-ion batteries. In the practical part of the thesis, the key parameters of selected types of commercially available lithium-ion batteries were measured under normal temperature conditions. The measurement was repeated at an elevated temperature. Results were analysed and effects of different temperatures on the selected characteristics were concluded both verbally and graphically. A conclusion evaluates short-term and long-term impacts of ambient temperature on rate capability, ageing, capacity fade and longevity.
|
|
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Design of Power HIL unit for Li-pol cell simulation
Pribulla, Daniel ; Sova, Václav (referee) ; Chalupa, Jan (advisor)
This thesis deals with design and construction of a Li-po cell Power-HIL simulator intended for testing of a small wireless module's powering. The simulator is based on a battery model which includes the influence of temperature and battery degradation on battery parameters. To estimate model parameters a series of tests on real Li-po cell with capacity 250mAh were performed. Charging and discharging tests were performed by different temperatures of the battery. In purpose of this test a simple thermal chamber was constructed. Design of the power electronics of the device was tested in the Simscape library of the Matlab Simulink. The result is a working prototype of the simulator tested for charging and discharging of batteries with capacity in range 100-1500 mAh. The simulator can be controlled with graphical user interface capable of setting the battery parameters and real time observation of the model variables.
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