Explain the important charging process of lithium battery

Stage 1: Trickle charge Trickle charge is used to pre-charge (recovery charge) the fully discharged lithium battery cell first. When the battery voltage is lower than about 3V, trickle charging is used. The trickle charging current is one-tenth of the constant current charging current, which is 0.1c (taking a constant charging current of 1A as an example, and the trickle charging current is 100mA) Phase 2: Constant current charging When the voltage of the lithium battery rises above the trickle charging threshold, the charging current is increased to perform constant current charging. The current for constant current charging is between 0.2C and 1.0C. The battery voltage gradually increases with the constant current charging process. Generally, the voltage set for a single cell battery is 3.0-4.2V. Stage 3: Constant voltage charging When the lithium battery voltage rises to 4.2V, the constant current charging ends and constant current charging begins. Voltage charging stage. According to the saturation of the battery cell, the charging current gradually decreases from the maximum value as the charging process continues. When it decreases to 0.01C, the charging is considered to be terminated. Stage 4: Charging termination is different from nickel batteries, and it is not recommended to continuously trickle charge lithium batteries. Continuous trickle charging will cause the plate plating effect of metal lithium. This will make the battery unstable and may cause a sudden automatic quick disassembly. The above-mentioned four-stage charging method takes about 2.5 to 3 hours to complete the charging of a fully discharged battery. Advanced chargers also adopt more safety measures. For example, if the battery temperature exceeds the specified window (usually 0°C to 45°C), then charging will be suspended. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.