Impedance measurements on batteries and fuel cells require sophisticated test equipment to allow for measurements under load and at very low frequencies. To achieve high precision a very high thermal stability of the measurement devices is necessary and a proper adjustment of the signal amplitude to allow for high precision on the one hand and to stay in the linear range of the electrochemical reactions on the other hand. Further more it is necessary to measure the impedance while DC currents are flowing to analyse the non-linearity. This requires compensation of the changing equilibrium voltages especially for measurements at low frequencies. The ElSmeter is more than a simple impedance spectroscope, but a complete test bench for different electrochemical power sources at the same time. All special features which are needed for a precise analysis of batteries and fuel cells are included in one unit. A high stability of the measurement devices allows for measurements at very low frequencies in the range of Micro-Hz or even lower frequencies. DC current channels and the possibility for parallel operation with other battery test benches allow for measurements under charging and discharging loads. The high number of measurement channels allows for real parallel measurements on various cells or modules at a time.
EISmeter - The art of impedance spectroscopy on batteries and fuels cells
EISmeter - Anwendung der Impedanzspektroskopie für Batterien und Brennstoffzellen
Technische Mitteilungen, Haus der Technik e.V. ; 99 , 1/2 ; 184-188
2006
5 Seiten, 5 Bilder, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
EISmeter - the art of impedance spectroscopy on batteries and fuel cells
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