1. What is the three-stage charging of lead-acid batteries?

The charging method of lead-acid batteries should be divided into three stages, namely: constant current charging - constant voltage charging - trickle charging.

Constant current charging stage: charge to 13.4V with 0.2C10 A current.

Constant voltage charging stage: 2.4V/cell, charging time 3h, cut-off current 0.02C10A

Trickle charge phase: 2.25V/cell.

2. Why is the lead-acid battery charged with the three-stage charging method?

At the beginning of charging, the battery has a strong acceptance capacity. This feature can be used to charge the battery with a large current to quickly get enough power to save time and energy. When it is charged to a certain level, it should automatically switch to And limited to a constant voltage value, limit the voltage to continue to rise, prevent the voltage from exceeding the end of charging, and damage the battery plate.

However, after charging in this way, due to the inhomogeneity of the battery plate materials, some materials are still not completely restored. If these materials are in a vulcanized state for a long time, they may become permanent lead sulfate and can no longer be restored. The capacity of the battery It will be damaged and gradually reduced.

Therefore, at the end of charging, trickle charging is required to restore a small part of the sulfide hidden in the deep inner layer as much as possible, so that the charging degree of the plates in one battery can be evenly charged inside and outside, and the plates of several batteries can also be charged. Be as uniform as possible.