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The internal resistance of batteries is the most basic performance indicator of batteries, and the size of the internal resistance has a very important impact on its performance. In the "lithium-ion battery industry standard conditions", there are also requirements for measuring the internal resistance of batteries: the company should have the ability to detect open circuit voltage and internal resistance online, with detection accuracy of 1mV and 1m, respectively.

What is internal resistance

The resistance experienced by the current flowing through the battery during operation, including ohmic internal resistance and polarization internal resistance, while polarization internal resistance also includes electrochemical polarization internal resistance and concentration polarization internal resistance. Ohmic internal resistance is composed of electrode material, electrolyte, diaphragm, and contact resistance of various parts. Polarization internal resistance is the resistance caused by polarization during electrochemical reactions, including electrochemical polarization and concentration polarization resistance.

On the right side of the figure is the equivalent circuit of a lithium-ion battery. We can consider separating the battery from the internal resistance and dividing it into a power supply without any internal resistance connected in series with a small resistance value. The graph on the left shows a discharge curve with the X-axis representing the discharge capacity and the Y-axis representing the voltage. The ideal state is a black curve, while the red one represents the true state when considering internal resistance. So the smaller the internal resistance of the battery, the better its cycle life and rate discharge performance will be.

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