What are the charging methods for iron lithium ion batteries
The charger of iron-lithium-ion batteries is different from ordinary lithium-ion batteries. The maximum termination charging voltage of lithium-ion batteries is 4.2 volts; lithium iron phosphate batteries are 3.65 volts. When the iron-lithium-ion battery is charged, it is the cable connected to the balanced charging board. Generally, it is charged in series directly from both ends, and the voltage of the charger is greater than the voltage of the battery pack. The cable detects the voltage of each single cell, which is equivalent to connecting a voltage regulator tube in parallel. The charging voltage of the single cell will not exceed the voltage regulation value, while other cells continue to charge through the voltage regulator tube bypass charging.
(1) Constant voltage charging method: During the charging process, the output voltage of the charging power supply remains constant. With the change of the state of charge of the power iron-lithium-ion battery, the charging current is automatically adjusted. If the specified constant voltage value is appropriate, it can not only ensure the complete charging of the iron-lithium-ion battery, but also minimize gas evolution and water loss.
(2) Constant current charging method: During the whole charging process, the charging current is kept constant by adjusting the output voltage. Keeping the charging current unchanged, the charging rate is relatively low. The constant current charging control method is simple, but because the acceptable current capacity of the lithium iron phosphate battery gradually decreases with the charging process, in the later stage of charging, the power receiving capacity of the power lithium battery decreases, and the charging current utilization rate is greatly reduced.
(3) Constant current and constant voltage charging method: The constant current charging method is adopted in the first stage to prevent the charging current from being too large at the beginning of constant voltage charging. The second stage adopts the constant voltage charging method to prevent the phenomenon of overcharging caused by constant current charging. The lithium iron phosphate battery is the same as any other sealed rechargeable battery. The charging should be controlled and cannot be overcharged, otherwise the battery will be easily damaged. Lithium iron phosphate batteries generally use a charging method of constant current first and then voltage limiting.
