Rated voltage of lithium ion battery
Lithium-ion batteries are rated at 3.6V (some products are 3.7V). The termination charge voltage at full charge is related to the battery anode material: the anode material is 4.2V for graphite; the anode material is 4.1V for coke. The internal resistance of different anode materials is also different. The internal resistance of the coke anode is slightly larger, and the discharge curve is slightly different, as shown in Fig. 1. Generally known as 4.1V lithium ion battery and 4.2V lithium ion battery. Most of the current use is 4.2V, and the termination discharge voltage of the lithium ion battery is 2.5V to 2.75V (the battery factory gives the operating voltage range or gives the termination discharge voltage, and the parameters are slightly different). Continued discharge below the termination discharge voltage is called overdischarge, and overdischarge can damage the battery.