How to measure the ohmic resistance of a battery using EIS (EIS-high-frequency-internal-resistance) Battery – Application Note 62

Abstract

The internal resistance of a battery can be used as a characteristic to estimate its State of Charge (SoC) or State of Health (SoH). In this note, we explain why the best way to measure this resistance is to perform an impedance measurement at several frequencies and use a tool such as Z Fit to fit the data.

Introduction

The aim of this note is to present different methods to measure internal resistance using impedance measurements. It will also
be explained that performing impedance measurements at several frequencies and fitting the impedance graph will reduce the uncertainty in internal resistance measurement.

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