As closed “black box” components, batteries are challenging energy-storage systems to fully assess. It’s obviously easy to measure their terminal voltage and input/output current, and to estimate their internal temperature based on external readings and appropriate thermal models. However, measuring their impedance is difficult, especially when the battery is in use. Yet that last factor is needed to fully judge their health and condition in active use or during a maintenance cycle.
To address this issue, the Idaho National Laboratory (INL) has developed an impedance measurement box (IMB) that directly addresses the in-use characterization of this parameter (Fig. 1). (INL is a leading government laboratory in the U.S. for research, development, demonstration, and deployment related to nuclear and other types of energy.) The project was developed in conjunction with Montana Tech, Motloch Consulting, and Qualtech Systems Inc., with support from the DoE Office of Energy Efficiency and Renewable Energy’s Vehicle Technologies Office.
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