The charging process of lithium-ion batteries can be divided into four stages:
Current charging, constant current charging, constant voltage charging and charging termination.
1. Trickle charging stage: Trickle charging means pre-charging (recovery charging) of fully discharged lithium batteries. When the battery voltage is lower than about 3V (minimum 2.75V), first use 0.1C (battery capacity x0. 1) Charge the lithium battery with constant current.
2. Constant current charging stage: When the voltage of the lithium battery is charged above the trickle charge threshold, the charging current is increased to perform constant current charging, and the current is between 0.2C and 1.0C (the general standard is 0.2C). The current during constant current charging is not required to be very accurate, and quasi-constant current is also acceptable.
3. Constant voltage charging stage: When the voltage of the lithium battery rises to 4.2V, the constant current charging automatically ends and the constant voltage charging stage starts. To maximize performance, the voltage regulation tolerance should be better than +1%.
4. Charge termination stage: Lithium batteries are different from nickel batteries, and it is not recommended to trickle charge lithium-ion batteries for a long time.
The precautions for charging lithium batteries are roughly as follows:
1. When charging the polymer lithium battery, you should choose the original charger, because the original charger’s charging current is designed for the best charging current of the product.
2. It is best to charge the lithium polymer battery with 0.2C standard current. Avoid fast charging as much as possible. Repeated charging and discharging will also affect the life of the polymer lithium battery.
3. The polymer lithium battery has self-discharge (all batteries have self-consumption), and it needs to be recharged every two or three months if it is not used for a long time, and it is stored with half electricity.
4. After the polymer lithium battery is fully charged, stop charging immediately, otherwise the polymer lithium battery will affect the battery performance due to heat or overheating.
Post time: Oct-20-2021
