Analysis of the four-stage charging principle of lithium battery charging

The four-stage charging principle of lithium battery charging. Stage 1: Trickle charging. Trickle charging is used to precharge the fully discharged battery cells. 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. Phase 2: Constant current charging When the voltage of the lithium battery rises above the trickle charge threshold, increase the charging current for 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 battery is 3.0-4.2V. Phase 3: Constant voltage charging When the voltage of the lithium battery rises to 4.2V, the constant current charging ends and the constant voltage charging phase begins. The current depends on the saturation of the battery cell. As the charging process continues, the charging current gradually decreases from the maximum value. When it decreases to 0.01C, the charging is considered to be terminated. Stage 4: Charge termination There are two typical charging termination methods: use the minimum charging current to judge or use a timer. The minimum current method monitors the charging current in the constant voltage charging stage, and terminates charging when the charging current is less than 0.02C. The second method starts timing at the beginning of the constant voltage charging phase, and terminates the charging process after two hours of continued charging. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the breakdown methods and working principles of lithium iron phosphate battery pack BMS?