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How to measure internal resistance

The usual methods for measuring the internal resistance of batteries include alternating current (AC) testing and direct current (DC) testing (of course, electrochemical impedance spectroscopy (EIS) is often used in electrochemical analysis. You can reply to the keyword EIS in the background to obtain a simple and easy to understand "EIS Introduction Tutorial")

The AC internal resistance method uses a positive selection current of 1KHz to test the voltage drop caused and calculate the internal resistance.

DC testing can be divided into DCR method, MCCF method, and HPPC method.

DCR method: Use different charging and discharging rates of current for 10 seconds, record the voltage and current, form a straight line, and the slope is the internal resistance.

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