In an uninterruptible power supply (UPS uninterruptible power supply) system, it can be said that the battery is the pillar of the system, and the UPS power supply without a battery can only be called the voltage and frequency stabilization (CVCF) power supply. UPS can achieve uninterrupted power supply, it is because of the battery, when the mains power is abnormal, the inverter directly converts the chemical energy of the battery into AC electrical energy, and the electrical equipment can be continuously operated.

At present, the maintenance-free sealed lead-acid batteries widely used in small and medium-sized UPS power supplies, more than 50% of the total cost of UPS power supplies, data show that the production technology of UPS power supplies has been relatively mature, about 50% of the UPS power failures related to UPS batteries. At present, China’s power supply situation is becoming more and more perfect, especially in cities, rarely occurs long-term power failure phenomenon, and many important departments use dual power supply and diesel generators to ensure the power supply, which makes people relax the daily maintenance of UPS power batteries, most UPS batteries due to the lack of effective maintenance at ordinary times, It is not clear about the health status of the UPS battery in its own system, resulting in the failure to work according to the design delay once the power is cut off for a long time. On the other hand, the user’s load is constantly increasing, the power density is becoming more and more concentrated, so that the load of the UPS power supply also increases correspondingly, and the problem of insufficient battery delay will become more prominent.

The failure of the UPS power supply battery is mainly manifested as insufficient terminal voltage, insufficient capacity or instantaneous discharge current does not meet the requirements of on-load start-up. In the process of using uninterruptible power supply system, people often one-sided think that the battery is maintenance-free and do not pay attention to it. It can be seen that strengthening the correct use and maintenance of UPS batteries is more and more important to extend the service life of batteries and reduce the failure rate of UPS uninterruptible power supply systems.