1. Poor quality or defects of the partition allow the active material of the electrode plate to pass through, resulting in virtual or direct contact between the positive and negative plates.
2. The displacement of the partition caused the positive and negative plates to be connected.
3. The active substance on the electrode plate expands and falls off, and due to excessive deposition of the fallen active substance, the lower or side edges of the positive and negative electrode plates come into contact with the sediment, causing the positive and negative electrode plates to be connected.
4. Conductive objects fall into the UPS power battery, causing the positive and negative plates to connect.
5. The "lead current" formed during welding of the electrode group is not completely removed, or there are "lead beans" present between the positive and negative plates during assembly, which damage the separator during charging and discharging and cause the positive and negative plates to be connected.