What are the differences between power lithium batteries and ordinary 18650 lithium batteries?

"Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses non-aqueous electrolyte solution.

3.7V 2600mAh 18650 Li-ion cell for lighting application

The 18650 battery is a general term for a type of battery. Now it mostly refers to the 18650 lithium battery, of which 18650 refers to the external size of the battery. 18 means the diameter is 18mm, 65 means the length is 65mm, and 0 means cylindrical battery.

The capacity of 18650 power battery is generally about twice smaller than that of ordinary batteries. It is estimated that it will not exceed 2000mAh at most. Generally, it looks like 1000mAh~1800mAh.

The working voltage of general power batteries is lower than that of ordinary lithium batteries. The highest charging voltage of ordinary lithium batteries is 4.2V, and the highest charging voltage of power lithium batteries is about 3.65V. The nominal voltage of ordinary lithium batteries is 3.7V, and the nominal voltage of power lithium batteries is 3.2V.

The 18650 power battery supports high current discharge, which may reach 20 times of the capacity, while the 18650 ordinary lithium battery only supports the discharge of 1 times of the capacity, that is to say, the maximum discharge current for an 2600mAh ordinary battery is 2600mA.

The difference between 18650 power lithium battery and ordinary 18650 lithium battery?

1. The positive and negative material particles of the 18650 power lithium battery are smaller than the ordinary 18650 lithium battery (increase the surface area and speed up the chemical reaction rate), and the diaphragm material and electrolyte used have better conductivity.

The 18650 power lithium battery has more tabs on the positive and negative electrodes than the ordinary 18650 lithium battery (reduces the internal resistance of the tabs and satisfies a larger current).

3. The 18650 power battery supports high current discharge, which may reach 20 times of the capacity, while the 18650 ordinary lithium battery only supports the discharge of 1 times of the capacity.

4. The capacity of 18650 power battery is generally about twice smaller than that of ordinary 18650 lithium battery.

5. The highest charging voltage of ordinary lithium batteries is 4.2V, and the highest charging voltage of power lithium batteries is about 3.65V. The nominal voltage of ordinary lithium batteries is 3.7V, and the nominal voltage of power lithium batteries is 3.2V.

Outdoor Power Supply with LFP Cells