State-of-Charge Monitoring and Battery Diagnosis of NiCd Cells Using Impedance Spectroscopy
With respect to aeronautical applications, the state-of-charge (SOC) and state-of-health (SOH) of rechargeable nickel−cadmium batteries was investigated with the help of the frequency-dependent reactance Im <i>Z</i>(<i>ω</i>) and the pseudo-capacitance <...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-01-01
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| Series: | Batteries |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2313-0105/6/1/4 |
| Summary: | With respect to aeronautical applications, the state-of-charge (SOC) and state-of-health (SOH) of rechargeable nickel−cadmium batteries was investigated with the help of the frequency-dependent reactance Im <i>Z</i>(<i>ω</i>) and the pseudo-capacitance <i>C</i>(<i>ω</i>) in the frequency range between 1 kHz and 0.1 Hz. The method of SOC monitoring using impedance spectroscopy is evaluated with the example of 1.5-year long-term measurements of commercial devices. A linear correlation between voltage and capacitance is observed as long as overcharge and deep discharge are avoided. Pseudo-charge <i>Q</i>(<i>ω</i>) = <i>C</i>(<i>ω</i>)⋅<i>U</i> at 1 Hz with respect to the rated capacity is proposed as a reliable SOH indicator for rapid measurements. The benefit of different evaluation methods and diagram types for impedance data is outlined. |
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| ISSN: | 2313-0105 |