Labels: There are many reasons for the insufficient capacity of lead-acid batteries
, mainly divided into the following aspects: 1) Lead-acid batteries can be installed and used in time when they reach the user after leaving the factory, resulting in long-term storage. The temperature has a great influence on the self-discharge of the battery. Long-term storage It will inevitably cause self-discharge to cause insufficient capacity. 2) The positive electrode plate is corroded and deformed, causing insufficient capacity. The positive plate of the lead-acid battery is the main factor affecting the working life of the battery. The capacity of the lead-acid battery charge-discharge cycle, especially the capacity drop under deep cycle is closely related to the quality deviation of the positive plate. a. The active material on the positive grid softens and falls off. Microscopically, there are macropores and pores in the active material. The size of the macropore exceeds 0.5cm. It is composed of many small pores. As the discharge cycle progresses, the surface of the active material shrinks. , The core is formed into a coral-like structure, and the small pores are aggregated in multiple cycles of discharge, so that the large pores continue to increase, which destroys the positive electrode structure and causes the active material to fall off. The main reason for these situations is caused by high current charging and discharging. To avoid occurrence, ensure the charging and discharging current and avoid overcharging or overdischarging. B. Positive grid corrosion deformation 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, and the more serious the corrosion. 3) Sulfation of the negative plate In normal operation, the PbSO4 particles on the negative plate are small, and the discharge can easily return to flocked lead, but sometimes lead sulfate is generated inside the battery, which is difficult to reduce, which is called sulfation. There are many reasons for the salting of the negative electrode, such as the inability to charge in time after discharge, long-term storage of the battery, causing serious self-discharge, excessive electrolyte concentration, insufficient long-term charging, and long-term discharge at high temperature. This lead sulfate is difficult to reduce by conventional methods. In this way, the reduction of active materials will inevitably affect the capacity of lead-acid batteries.
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