Why does the UPS battery fail?

Causes of UPS power battery failure The UPS power lead-acid battery failure may be caused by many reasons, such as vulcanization, water loss, thermal runaway, active material shedding, and plate softening. The author elaborates one by one below. 1. The charging and discharging process of the vulcanized UPS battery is an electrochemical reaction process. When discharging, lead sulfate is generated, and when charging, lead sulfate is reduced to lead oxide. This electrochemical reaction process is cyclically reversible under normal circumstances, but lead sulfate is a salt that is easy to crystallize. When the concentration of lead sulfate in the electrolytic solution in the battery is too high or the static idle time is too long, it will clump together. Formed into small crystals, these small crystals then attract the surrounding lead sulfate, forming large inert crystals like a snowball, which breaks the original reversible cycle and causes the lead sulfate to be partially irreversible. 2. A set of 36 volt lead-acid batteries has 3 single UPS power batteries, each single battery has 6 cells, each cell has more than 15 positive and negative grids, a set of batteries has at least 270 solder joints, if there is a one-thousandth of the false welding, every 4 groups of batteries will inevitably have a group of failures, and lead-calcium plates are very easy to cause false welding due to calcium evolution, so battery manufacturers generally use low antimony alloy The low-antimony alloy has a lower gas evolution voltage, and the battery gas output is larger, and the water loss is more serious. 3. Thermal runaway charging itself is an exothermic reaction. Generally, the thermal design of lead-acid batteries can control the temperature rise. After a large amount of gas out of the lead-acid battery of the UPS power supply, the oxygen is compounded into water on the negative plate, and the heat generated is much greater than the heat generated during charging. Sealed lead-acid batteries hope that the negative plate has a good oxygen circulation capacity, but heat will occur during oxygen circulation. Therefore, the oxygen cycle is a double-edged sword. The advantage is that it reduces water loss, but the disadvantage is that the battery generates heat. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the correct charging methods for lithium battery packs for electric vehicles?