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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Design of tester for electric hand tools batteries
 Václavík, Tomáš ; Bednařík, Josef (referee) ; Krejsa, Jiří (advisor)
This thesis describes design and realization of simple testing device used to estimate State of Health of Li-ion accumulator pack. Basic parameters of Li-ion accumulators and methods used to examine their state are explored. Specific type of accumulator and its charger are analyzed. Complete device design, device realization, measurement records and their analysis are carried out. Algorithm for quick estimate of State of Health is created.
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Lead-Acid Battery Evaluation Based On Opencircuit Voltage Fluctuation Measurement
 Kuparowitz, Tomáš ; Kuparowitz, Martin
The state of charge and the state of health are two crucial parameters of batteries. Current state of the art methods of their estimation include some as simple as measuring open circuit voltage, all the way to fuzzy logic estimation and constant online battery overview. Some main problems of such methods are either the length of single parameter evaluation cycle, or their inherent inaccuracy due to limitations in battery manufacture precision. This article proposes novel method of the lead-acid battery state of the health estimation, based on open circuit noise measurement. It reports the nature of changes in low frequency noise spectral density, that occur after catastrophic self-discharge failure or avalanche voltage drop in lead-acid batteries.
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