ACIR measurement
The ACIR (Alternating Current Internal Resistance) measurement is a test method for determining the alternating current internal resistance of battery cells, battery modules, or energy storage systems.
An AC signal is applied to determine the cell’s internal resistance. The measured value is typically expressed in milliohms (mΩ) and is used to assess cell quality, performance, and aging status.
In test engineering, stable contact, low transition resistance, and reproducible measurement conditions are crucial, as even small contact deviations can influence the measurement result.
FAQ
It is used to evaluate the quality, performance, and condition of battery cells, for example in development, production, and quality assurance.
Since very small resistances are being measured, unstable contacts or increased transition resistances can distort the measurement result.
ACIR describes the internal resistance under AC excitation, while DCIR evaluates the internal resistance under DC load. Both methods provide different insights into a battery’s electrical behavior.
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