The actual capacity of the battery will decrease after a long time

by:Power Kingdom     2021-06-14
Label: The actual capacity of the battery will decrease after a long time. From the practice of life, we can find that whether it is a start-up battery or an energy storage battery, as long as it is used for a long time, no matter how long the battery is charged, the battery level It seems to run out very quickly. This is what we call capacity reduction. Then why does the actual capacity of the battery decrease after using it for a long time? We can see from the structure of lead-acid batteries. The positive plate of a 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. 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, and the deeper the depth of discharge, the more severe the corrosion. With such aging, the battery can no longer be charged. From the perspective of the chemical reaction of lead-acid batteries. In the normal operation of the battery, the PbSO4 particles on the negative plate are small, and the discharge can easily return to velvet 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. Therefore, we have repeatedly emphasized that battery storage must have a serious maintenance system to ensure battery quality. Another thing we must pay attention to is that even if the battery is not used, it must be charged regularly for long-term storage, otherwise it will cause a lack of capacity due to self-discharge.
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