Constant voltage charging method

The voltage of the charging power supply maintains a constant value during the whole charging time. With the gradual increase of the battery terminal voltage, the current gradually decreases. Compared with constant current charging method, its charging process is closer to the optimal charging curve. Fast charging with constant voltage. Because the electromotive force of the battery is low and the charging current is large at the initial stage of charging, the current will gradually decrease with the charging process. Therefore, only a simple control system is needed.
This charging method has little electrolytic water to avoid overcharge of the battery. However, the excessive current at the initial stage of charging will have a great impact on the battery life, and it is easy to bend the battery plate, causing the battery to be scrapped. In view of this disadvantage, constant voltage charging is rarely used, only when the charging power supply voltage is low and the current is large. For example, the battery is charged by constant voltage charging method during vehicle operation.