How to better use and maintain lithium batteries?

On-line UPS power supply, because of its reasonable circuit design and large margin for driving power element capacity, the power circuit failure rate is very low. In contrast, the failure rate caused by battery packs has risen to more than 60%. It can be seen that the correct use and maintenance of the battery is one of the key factors to extend the life of the battery pack and reduce the overall failure rate of the UPS power supply. 1. Regular inspection Regularly check the terminal voltage and internal resistance of each unit battery. For 12V unit batteries, if the terminal voltage difference between each unit battery exceeds 0.4V or the internal resistance of the battery exceeds 80m during the inspection, each unit battery should be charged in equalization to restore the internal resistance of the battery And eliminate the terminal voltage imbalance between each unit battery. When equalizing charging, the charging voltage can be 13.5～13.8V. Most of the batteries that have been well-balanced and charged can restore their internal resistance to less than 30m. During the operation of the UPS power supply, the above-mentioned imbalance due to the changes in the battery characteristics of each unit over time cannot be eliminated by the internal charging circuit of the UPS power supply. Therefore, the obvious imbalance of this characteristic has occurred in the battery. If you don’t take the offline equalization process in time, the imbalance will become more and more serious. 2. Re-float the UPS power supply and shut down for more than 10 days. Before restarting, the UPS power supply should be started without loading to use the charging circuit in the machine to re-float the battery for more than 10-12 hours and then run with load. The UPS power supply has been in a floating charge state for a long time without a discharge process, which is equivalent to being in a storage standby state. If this state lasts for too long, causing the battery to fail due to long storage, it is mainly manifested in the increase of the internal resistance of the battery, which can reach a few in severe cases. We found that the usable capacity of the battery is about 97% of its rated value after storage for 1 month at a room temperature of 20°C. If stored for 6 months, its usable capacity will become 80% of its rated capacity. If the storage temperature increases, its usable capacity will decrease. Therefore, it is recommended that users should deliberately unplug the mains input every 20C months, and let the UPS power supply work in a state where the battery supplies energy to the inverter. But this kind of operation should not take too long. When the load is about 30% of the rated output, discharge for about 10 minutes. 3. Reducing the service life of a deep-discharged battery is closely related to the depth to which it is discharged. The lighter the load carried by the UPS power supply, the greater the ratio of the available capacity of the storage battery to its rated capacity when the mains power supply is interrupted. In this case, when the UPS power supply automatically shuts down due to low battery voltage, the battery is shut down. The depth of discharge is relatively deep. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What factors will shorten the life of lithium batteries?