Short-Term Impact of AC Harmonics on Aging of NiMH Batteries for Grid Storage Applications

Jenny Börjesson Axén, Rudi Soares, Oskar Wallmark, Peter Thelin, Erika Widenkvist Zetterström, Göran Lindbergh
2021 Materials  
Batteries in energy storage systems are exposed to electrical noise, such as alternating current (AC) harmonics. While there have been many studies investigating whether Lithium-ion batteries are affected by AC harmonics, such studies on Nickel Metal Hydride (NiMH) batteries are scarce. In this study a 10 Ah, 12 V NiMH battery was tested with three different harmonic current frequency overlays during a single charge/discharge cycle: 50 Hz, 100 Hz, and 1000 Hz. No effect on battery internal
more » ... rature or gas pressure was found, indicating that NiMH battery aging is not affected by the tested harmonic AC frequencies. This can reduce the cost of energy storage systems, as no extra filters are needed to safeguard the batteries. Instead, the capacitive properties of the batteries give the possibility to use the battery bank itself as a high pass filter, further reducing system complexity and cost.
doi:10.3390/ma14051248 pmid:33800751 fatcat:4op54ns4p5ab7ndf6drhh3pb6u