Study on the choice of UPS battery and charging mode.
The determination of battery capacity is an important part of UPS system design. Both too high and too low battery capacity are detrimental to the operation of the UPS system. If the capacity is too high, it will increase the investment cost, and it will easily lead to the low current deep discharge of the battery, causing permanent damage to the battery; if the capacity is too low, it will not meet the requirement of uninterrupted power supply for the load, and the high current charge and discharge will shorten the battery life. . Therefore, the correct selection of the battery capacity that is compatible with the UPS capacity and load capacity is the key to controlling the investment cost of the UPS system and ensuring the reliability of uninterrupted power supply.
From the chemical reaction formula, it is known that after the lead-acid battery is discharged, the electrolyte consumes sulfuric acid due to the generation of PbSO with the positive and negative plates, as a result, the specific gravity of the electrolyte decreases. On the contrary, when charging, the sulfuric acid in the lead sulfate of the positive and negative plates is gradually released, and the concentration of sulfuric acid in the electrolyte gradually increases and the specific gravity rises. Generally, at the end of charging, the positive and negative plates of lead-acid batteries have been reduced to lead dioxide and spongy lead. The subsequent charging is almost in the electrolyte water to generate oxygen (anode) and hydrogen (cathode) to escape. As a result, the electrolyte is reduced, which is why the general liquid lead-acid battery needs to be refilled frequently.