Recently, Picotest has had several questions from customers working to measure battery impedance. There are numerous publications and articles about testing battery impedance, even from vector network analyzer (VNA) manufacturers such as OMICRON Lab, including a useful 2017 application note guide from Florian Hämmerle.
This article will discuss some of the reasons for measuring battery impedance. It will investigate some of the reasons for the challenges in addition to presenting several methods of measuring battery impedance. This article will not include the analysis of results, given that this is its own topic; however, it will briefly touch upon why analysis can also cause confusion.
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