What are the methods and techniques for repairing UPS lithium battery system

First, test the working status of the battery on the UPS, and specifically record the float voltage of each battery. The important relevant experience is that the battery should be at a voltage of 2.25V per cell, that is, the voltage of a 12V battery should be strictly 13.5V. If it is lower than this voltage, it is necessary to suspect whether the battery is under-charged. If the battery voltage is higher than this voltage, it is necessary to suspect whether the battery is losing water. While installing such a requirement, observe the total voltage of the lithium battery UPS. If a 48V battery is used in series, and the unit battery voltage is 2.25V, it should be 54V. Below this voltage, the battery is undercharged, and above this voltage, the battery will lose water. When testing lithium battery UPS, I saw that many UPS chargers were working abnormally. Then charge and discharge the battery to test the capacity of the UPS lithium battery. Note that charging is best to use 2.4V/single cell, 0.1C～0.25C current limit. When the battery charging reaches 0.01C current after entering the constant voltage, the charging ends. Then discharge the battery at a current of about 0.1C to 0.25C. When the discharge is over, record the discharge time and calculate the battery capacity. 2. Regarding the battery with high voltage, go straight into the pulse to repair the vulcanization. After replenishing the UPS lithium battery, pulse repair and vulcanization should also be carried out. Due to the serious vulcanization of UPS lithium batteries, the general repair time is more than 3 days. Every 3 days, conduct a charge and discharge test of battery capacity. If the battery capacity does not increase or increase, continue to repair it. Until it is found that the battery does not rise any more after it has risen, the battery repair is over at this time. And record the battery capacity. What should be added here is that every time the battery is discharged to detect the capacity, it must be charged in time before saving or continuing to repair the battery. Otherwise, the battery will quickly vulcanize after 12 hours. 3. Match the repaired battery, store it for 1 day, and measure its open circuit voltage. According to the open circuit voltage of the battery and the capacity of the battery, the grouping is carried out. The open circuit voltage error of the battery is required to be no more than 0.03V, and the battery capacity difference is no more than 10%. In this way, a part of the batteries with large deviations in capacity and voltage should be eliminated. Also remove batteries with large voltage deviations. There are also batteries with a capacity lower than 70% of the nominal capacity. According to my relevant experience, the utilization rate of the battery is about 60%-85%. It is necessary to supplement other lithium battery UPS. Therefore, when repairing lithium battery UPS, it is often to repair 10 almost the same UPS at the same time, with 6 to 7 sets of batteries, and then help users to buy 3 to 4 sets of batteries. There must be a battery with a capacity that meets the requirements but the capacity of the battery cannot be matched with the battery, and it is reserved for other uses. 4. Maintenance Regarding the repaired lithium battery, it is usually to put a battery pulse protector on the battery so that the battery will not be vulcanized. The way to equip the battery with a protector is to hang a protector for every 12V battery. And conduct a test every 3 months, promptly remove those batteries with low voltage, and perform individual charging, discharging and impulse repairs on the batteries. In this way, the battery life can generally be increased by 1 to 4 years. 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 post: What is the charging time and discharging time of the lithium battery?