Battery internal resistance is not a fixed value. And it will be affected by many factors. Let’s take a look at the factors that affect the internal resistance of the battery.

Temperature

The temperature has a great effect on internal resistance. The lower the temperature, the slower the ion transport inside the battery, and the greater the internal resistance of the battery.

SOC

The internal resistance varies when the battery is in different SOC. Generally, the internal resistance of the battery increases significantly at a deeper depth of discharge.

Charge Cut-off Voltage

The charge cut-off voltage has an effect on the internal resistance during the battery cycle. Too high or too low a charge cut-off voltage will increase the interface impedance of the electrode.

What’s more, during the battery cycle, the internal resistance of the battery increases with the depth of charge and discharge. The increase of the internal resistance is proportional to the strengthening of the depth of charge and discharge.

Internal resistance is one of the important indicators to evaluate the performance of batteries, so we should have a certain understanding of the internal resistance of batteries.

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