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Tech Note | Battery Resistance vs Impedance Testing

Description

The first point is that resistance testing and impedance testing are carried out by similar but importantly different methods; resistance is measured by using a DC current to perturb (excite) the cell, while impedance uses an oscillating (AC) current.

The resistance method eliminates other parameters present in the cell and measures pure resistance. Impedance tests also measure resistance, but the measurement includes values for other parameters present in the cell, such as capacitance and inductance, without separating these parameters out. Therefore the resulting test values for resistance and impedance for the same cell will be different.

This technical note will explore other differences between the two testing methodologies.

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