There are more than one electrochemical process taking place inside the battery such as ion diffusion, charge transfer e.t.c The impedance test provides a four-wire Kelvin type measurement that gives a reliable and reproducible data set on which sound decisions regarding battery maintenance and replacement care are based.īy performing an impedance test, you can identify weak cells so that the right measures can be taken to avoid total system failure.Ī battery is more complex than what can just be seen by the eyes. The frequency of the AC current does not in any way affect the impedance but resistance and capacitance are the only items that affect impedance. It is only by measuring both that the battery capacity can be understood. Impedance test measures both the resistance and reactance in the battery. It is important to measure battery impedance before testing the battery capacity as it has been shown that there is a strong relationship between battery impedance and battery capacity. This is important to avoid major failures.
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This is useful for planning.īy knowing the weak cells, you will prevent the entire string of cells from going offline and making the load no longer supported. Regular impedance measurement reveals the condition of cells in a string and it is easy to know when to replace a battery cell or the whole battery. This is important because other AC currents are present in the charging system and need to be taken into consideration.Īs the battery ages, the internal impedance increases as the battery cell gets older. Using Ohm’s Law, then calculate the impedance.Īpart from the measurement of the AC voltage, the measurement of AC current is also important. To determine the impedance, you need to apply the AC current signal and take the measurement in the drop in voltage across the cell or in the intercell connector.
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The total voltage in the string is then measured plus the total voltage drop by measuring individual cells and intercell connection sequentially until the whole string is measured. The impedance test is done by applying the AC test signal to the test plates. Using impedance test, you can easily identify weak cells in a battery. The battery impedance test measures the electrical path of the battery from the terminal plate to the next one.