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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
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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Lithium and its impact on the environment in lithium battery cell failures
 Linney, Phillip George ; Doležalová Weissmannová, Helena (referee) ; Komendová, Renata (advisor)
This bachelor thesis deals with the study of the release of alkali metals and selected heavy metals from battery cells into firefighting water. The battery samples were prepared by superheating them with subsequent explosion and then leaching in distilled water. The change in pH and conductivity compared to distilled water was monitored after a specified time. Flame emission spectrometry and ICP-MS were used to measure elemental concentrations. The measured values of metal contents in aqueous extracts of the battery samples burned in air were compared with those of the samples exploded under water. Some differences were found. A concentration sequence was found for the extracts of the air-burned battery samplesLi+ >> K+ > Na+, whereas for the samples of extracts of batteries burnt in water the concentration sequence Li+ >> Na+ > K+ was found. The concentrations of Na+ ions were around 12.7 mg/l for the samples exploded under water and 275 mg/l thereafter. The K+ concentration was around 19 mg/l for both sample types. Lithium ions were determined the most of all elements measured, averaging 1500 mg/l for air-burned samples and 8200 mg/l for underwater exploded samples. Higher concentrations of Fe, Ni, Cu, Mn and Co were found in the ICP-MS measurements depending on the composition of the battery sample.
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