Do you know what charging methods are important for lithium iron phosphate batteries?

Generally, the upper limit voltage of lithium iron phosphate battery charge is 3.7~4V, and the lower limit voltage of discharge is 2~2.5V. The five aspects of discharge capacity, median discharge voltage, charging time, constant current capacity percentage, and safety are considered. Constant current and constant voltage are adopted. For lithium iron phosphate battery packs, it is reasonable to set the charging limit voltage at 3.55～3.70V, the recommended value is 3.60～3.65V, and the lower limit voltage of discharge is 2.2V～2.5V. The charger of lithium iron phosphate battery pack is different from ordinary lithium battery. The highest termination charging voltage for lithium batteries is 4.2 volts; the lithium iron phosphate battery pack is 3.65 volts. When charging the lithium iron phosphate battery pack, it is connected to the balance charging board. Generally, it is directly charged in series from both ends. The voltage of the charger is greater than the voltage of the battery pack. The cable detection of the voltage of each single cell is equivalent to connecting a zener tube in parallel. The charging voltage of the single cell will not exceed the voltage stabilization value, while the other single cells continue to be charged through the zener tube bypass charging. (1) Constant voltage charging method: During the charging process, the output voltage of the charging power supply remains constant. As the state of charge of the lithium iron phosphate battery pack changes, the charging current is automatically adjusted. If the specified voltage is constant, it can not only ensure the full charge of the power lithium-ion battery, but also minimize gassing and water loss. (2) Constant current charging method: During the entire charging process, the charging current is kept constant by adjusting the output voltage. Keep the charging current constant, the charging rate is relatively low. The constant current charging control method is simple, but because the acceptable current capacity of the lithium battery pack gradually decreases with the progress of the charging process, in the later stage of the charging, the power receiving capacity of the power lithium-ion battery decreases, and the charging current utilization rate is greatly reduced. (3) Constant current and constant voltage charging method: This charging method is a simple combination of the above two. The constant current charging method is used in the first stage to prevent excessive charging current at the beginning of constant voltage charging. (4) Chopping wave charging method: Use the chopping method to charge. In this method, the current of the constant current source remains unchanged, and the switch tube is controlled to turn on for a period of time and then turn off for a period of time, cyclically. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Introduction to the recycling method of lithium battery packs