Reasons for the decline in capacity of forklift batteries in the middle and later stages of use

In the middle and late use of the forklift battery, many users feel that the forklift battery is insufficient. In fact, this is mainly caused by the gradual decrease in the capacity of the forklift battery.
There are many reasons why the capacity of the forklift battery decreases during use, mainly in the following aspects
1. After the forklift battery leaves the factory, it can be installed and used in time when it arrives at the user, resulting in long-term storage. Long-term storage will inevitably cause self-discharge and cause insufficient capacity.
2. The positive plate of the forklift battery is corroded, and the deformation causes insufficient capacity.
The positive plate of the forklift battery is the main factor affecting the working life of the battery. The capacity of forklift battery charge-discharge cycles, especially the capacity drop under deep cycle, is closely related to the quality deviation of the positive plate.
2.1 The active material on the positive grid softens and falls off
Microscopically, there are macropores and micropores in the active material. The size of the macropore exceeds 0.5cm. It is composed of many small pores. With the progress of the discharge cycle, the surface of the active material shrinks, forming a core to form a coral-like structure. During the second discharge cycle, the aggregation of small pores increases, which leads to the continuous increase of large pores, which destroys the structure of the positive electrode and causes the active material to fall off.
The main reason for these situations is the high current charging and discharging of the forklift battery. Avoid the occurrence of the current that should guarantee the charge and discharge and avoid the phenomenon of overcharge or overdischarge.
2.2 Corrosion and deformation of positive grid
The corrosion rate of the grid depends on the composition of the grid alloy, but the higher the storage temperature, the faster the corrosion rate, the deeper the discharge depth, the more serious the corrosion.
3. Sulfation of negative plate of forklift battery:
In normal operation, the PbSO4 particles on the negative plate are small, and the discharge is easy to restore to velvety lead, but sometimes lead sulfate that is difficult to reduce is generated inside the battery, which is called sulfation.
There are many reasons for the salinization of the negative electrode, such as the failure to charge in time after discharge, the long-term storage of the battery, causing serious self-discharge, the high electrolyte concentration, the long-term insufficient charging, and the long-term discharge at high temperature. This lead sulfate is difficult to restore by conventional methods. , so the reduction of active substances will inevitably affect the capacity of the forklift battery.

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