1. constant voltage charging
Constant voltage charging means that the charging voltage is constant during charging. When the battery is charged by the generator in the automobile, it belongs to constant voltage charging, and its charging voltage is controlled by the voltage regulator of the charging system. According to the voltage level of the whole vehicle, the generator output voltage of the voltage regulator is 14 V and 28 V, respectively.
The advantage of constant voltage charging method is that the charging current is large, the charging speed is fast and the time is short. After the battery is fully charged, the charging will be stopped automatically without manual adjustment. Its disadvantages: the battery can not be fully enough electricity, so the battery used by the car is required to remove the battery every month and charge it once in the charging room.
2. constant current charging
In the charging process, the charging current constant constant charging mode is called constant current charging. In order to keep the charge current constant, the charging voltage must be raised as the battery electromotive force rises. Charging the battery with a charger belongs to constant current charging.
The constant current charging can be divided into two stages, the first stage constant current charging with higher current, when the cell voltage charge to 2.4 V, the electrolyte began to produce bubbles, the charging current is reduced by half, to enter the second stage constant current charging, the battery fully charged until now.