Abstract
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 temperature 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.
Highlights
Industrial scale Nickel Metal Hydride (NiMH) batteries have many different uses, both as stationary systems and in traction applications
Stationary applications include, e.g., uninterruptible power supply (UPS), smart grid energy storage, fast charging buffer for electric vehicles, and home storage. In many of these applications, the batteries are continuously exposed to direct current (DC) loads that contains a certain amount of harmonics
Considering the aging behavior of the NiMH battery type as discussed in previous paragraphs, the lack of effect on temperature or gas pressure found in this study indicates that the aging is not aggravated by the superimposed alternating currents (AC)-frequencies tested
Summary
Industrial scale Nickel Metal Hydride (NiMH) batteries have many different uses, both as stationary systems and in traction applications. Stationary applications include, e.g., uninterruptible power supply (UPS), smart grid energy storage, fast charging buffer for electric vehicles, and home storage In many of these applications, the batteries are continuously exposed to direct current (DC) loads that contains a certain amount of harmonics. This can be caused by the converter itself, e.g., by the control method and the switching frequency of the converter, and/or through incomplete filtering of harmonics present in the grid voltage [1,2]. The study presented in this paper aims to investigate the short-term effect of DC current overlaid with AC frequencies on the behavior of a NiMH battery, to assess whether battery life is affected
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