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What is the normal internal resistance of the battery

For lithium-ion batteries, the internal resistance of the battery is divided into ohmic internal resistance and polarization internal resistance. Ohmic internal resistance is composed of electrode material, electrolyte, diaphragm resistance, and contact resistance of various parts. Polarization resistance refers to the resistance caused by polarization during electrochemical reactions, including resistance caused by electrochemical polarization and concentration polarization.

The internal resistance of the 18650 lithium-ion battery is generally lower due to its high discharge current. For example, the Samsung 18650-2200-5C power has an internal resistance of less than 35 ohms. A regular 18650, such as a Samsung 18650, usually has an internal resistance of less than 80 milliohms, but in reality, it is less than 65 milliohms.

The internal resistance of the currently performing 18650 lithium-ion battery is approximately 12 milliohms, while it is generally around 13-15 milliohms; Due to the impact of impedance on battery performance, generally 50 ohm is normal. 50-100 ohm can be used, but performance begins to decline. When it reaches 100 or above, it needs to be used in parallel, and when it exceeds 200 ohm, it cannot be used.

If the 18650 lithium-ion battery is used for too long, the internal resistance of the lithium-ion battery will increase, and the output voltage will decrease. The internal resistance, static internal resistance, and operational internal resistance of lithium-ion batteries often differ, and the internal resistance also varies under different environments and temperatures.

Is it better to have a high or low internal resistance of the battery

The smaller the internal resistance of the battery, the better. The smaller it is, the less energy it consumes.

E=V1+V1 * r/R1E=V2+V2 * r/R2V1, V2, R1, R2 are known, solve for E and r. R is the internal resistance of the battery.

The premise is that the internal resistance of the voltmeter should be much greater than R1 and R2.

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