Constant current charging method, constant voltage charging method, stage charging method.
1, constant current charging method
It is a charging method that keeps the charging current intensity unchanged by adjusting the output voltage of the charging device or changing the series resistance with the battery. The control method is simple.
2, constant voltage charging method
The voltage of the charging power supply maintains a constant value during the whole charging time, and the current gradually decreases with the gradual increase of the battery terminal voltage. Compared with the constant current charging method, the charging process is closer to the better charging curve. However, in the initial charging current is too large, which has a great impact on the life of the battery, and it is easy to bend the battery plate, resulting in battery scrap.

3, stage charging method

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The method includes two-stage charging method and three-stage charging method
① The two-stage method uses a rapid charging method combining constant current and constant voltage. First, the constant current is charged to the predetermined voltage value, and then the remaining charge is completed by changing to constant voltage.
The three-stage charging method uses constant current charging at the beginning and end of charging, and constant voltage charging in the middle. When the current decays to a predetermined value, the second stage is converted to the third stage.