In UPS power supply systems, most batteries are maintenance free. The main function of maintenance free batteries in UPS power supply systems is to store electrical energy. Once the mains power is interrupted, the batteries are discharged and supplied to the inverter, which converts the DC power released by the batteries into sinusoidal AC power to maintain the power output of the UPS and ensure that the load can use electricity normally for a certain period of time.
When the mains power supply is normal, the battery stores electrical energy in the rectification charging circuit, while also smoothing and filtering the DC circuit, and acting as a buffer when the inverter is overloaded.
Its function should mainly include two aspects: to achieve the continuity of power supply in the event of fluctuations, transients, or even interruptions in the supply of mains electricity and oil engines. During the seamless switching process of the power supply, ensure that there is no interruption of more than 10m in the power supply to the equipment, and ensure that the equipment does not experience power failure.
After the interruption of power supply from the mains and oil engines, it serves as a backup energy source for a limited period of time to ensure that the load can use electricity normally for a certain period of time. It is the final energy guarantee for emergency power supply to the AC UPS system, and its role mainly depends on the discharge current and capacity of the maintenance free battery pack of Reddy.
In daily work, people often unilaterally believe that maintenance free batteries are maintenance free and do not attach importance to them. However, due to the unreasonable use of batteries, problems such as electrolyte drying, thermal runaway, early capacity loss, and internal short circuits have occurred, which seriously affect the reliability of the power supply system. According to data, the proportion of UPS host failures or abnormal operations caused by battery failures is approximately 60%. From this, it can be seen that strengthening the correct use and maintenance of UPS batteries is of increasing significance in extending the service life of maintenance free batteries and reducing the failure rate of UPS power supply systems.