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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.
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The Effect of Temperature on Damping Behavior
Munduch, Zdeněk ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The bachelor thesis deals with the influence of temperature on the function of the suspension damper. The magnitude of damping force generated by the shock absorber varies with the temperature of the shock absorber. The reasons why the temperature effect occurs and how to reduce it, for example by suitable valve design, are described. The heat transfer between the damper and its surroundings is also described. The different ways in which heat transfer and the influence of the damper configuration on the heat flux are discussed. Based on the energy balance, an analytical calculation model has been developed to calculate the heat generated by the damper based on the change in the internal energy of the damper and the heat flux between the damper and the surroundings. The findings presented in the model were experimentally tested by measurements on a damping dynamometer in the ÚADI laboratories and the results were compared with other methods of calculating the generated heat. The measurement results show the critical points on the damper where the greatest temperature rise occurs. They also show the change in heat flux between the damper and the damper surroundings depending on the ambient conditions.
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Battery thermal unit design
Raclavský, Martin ; Ušiak, Michal (referee) ; Šebela, Kamil (advisor)
This bachelor's thesis brings knowledge about the testing of battery cells and provides a particular design of a tempering unit for monitoring the effect of temperature on their parameters. The work can be divided into two parts. The first research part is focused on the theoretical foundations that deal with testing the parameters of battery cells and the effect of temperature on their operation. The research provides a deeper understanding of the relationship between temperature and the performance, capacity, lifetime and safety of battery cells. In the second part, based on the knowledge gained, the design of a thermal conditioning unit is carried out, which serves to provide a temperature-stable simulated environment for monitoring the effect of temperature on the tested cells. The design includes a chamber, a thermal block for temperature regulation, a method of cooling and heating, and suitable wiring. Heat losses were calculated, the required heat output was determined, and possible modifications to the unit were discussed.
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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.
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