Analysis of Safety Protection of Lithium Battery in UPS Application

Safety protection analysis of lithium battery in UPS application Safety maintenance analysis of lithium battery in UPS. In the operation of UPS power supply, the time required for backup by the user is also getting longer and longer. The lithium battery is small, light in weight, longer cycle life, etc., which have become the key energy storage component of the reform, and also represent the operation of UPS power supply. The pace of reform is closely related to the UPS host. However, the safety of lithium batteries has been criticized by UPS, and today the author will discuss this issue in detail. Safety maintenance analysis of lithium battery in UPS ●Safety factor of lithium battery When the lithium battery is affected by factors such as high ambient temperature, mechanical damage, serious lithium battery manufacturing defects, etc., heat loss may occur, but the degree of damage after heat loss There are big differences due to different data. In addition, the larger the capacity of a single battery, the greater the heat loss. The requirements of the lithium battery UPS system for the BMS battery processing system Although the BMS lithium battery cannot solve the fundamental problem of lithium battery safety, when the suitable single battery of the UPS power supply is a lithium iron phosphate battery pack, the stability and adaptability of the system depends on BMS. Therefore, most of the research and development of BMS is done by industrial users, not by battery manufacturers. The requirements of the lithium battery system for the BMS battery are as follows: 1. Cell equalization voltage: When the cell voltage is greater than this value, the equalization is turned on; 2. The charge voltage is restored: After the charging maintenance, when the cell maximum voltage is greater than this value, it will be restored Charge; 3. Recycle the discharge voltage: After discharge maintenance, when the minimum value of the cell voltage is greater than this value, recycle the discharge; 4. Continuous shutdown cell value: When the minimum cell value is less than this value, the system will actively shut down and shut down; 5. The highest level 1 alarm value of the monomer: the highest level 1 alarm value of the monomer; 6. The highest level 2 alarm value of the monomer: when the highest level 2 alarm value of the monomer is greater than this value, a secondary alarm occurs and the charging contactor is off. On; 7. The minimum single level 1 alarm value: the minimum single level 1 alarm value; 8. The lowest single level two alarm value: when the lowest single level is less than this value, a secondary alarm occurs, and then the discharge contactor is disconnected . The safety of lithium battery UPS power supply is considered from four aspects: 1. High-quality battery processing and quality control At present, the world's leading lithium battery manufacturers have selected advanced active processing lines, which ensure high quality and high consistency The battery is only controlled in high-quality processing. Due to the strict quality control of lithium battery UPS, its cycle life has been greatly improved compared with lead-acid batteries. Many major brands of lithium batteries can achieve a 10-year warranty in the field of data centers. 2. Perfect BMS planning The BMS lithium battery processing system is the core technology address for the safety of the entire lithium battery system. When UPS batteries have shortcomings such as over-voltage charging, over-discharging, and battery short-circuiting, BMS can be used to block the defective current to prevent the danger of battery heat loss. 3. Lithium battery chemistry data As for the lithium battery UPS of the data center, due to its short discharge time of large current, high discharge power, long-term standby electric floating charge, etc., it is more suitable to use lithium iron phosphate, lithium manganate, and NCM ternary lithium. And other technologies. According to csne analysis, the safety of lithium battery UPS power system requires many factors, such as negative data, electrolyte, diaphragm data, battery cell packaging, battery module group, BMS, fuse maintenance, DC circuit breaker, manufacturing process level and quality control, etc. . 4. Compatibility test between lithium battery and UPS is different from lead-acid battery. Lithium battery is equipped with BMS. BMS is a kind of smart battery that can self-regulate and communicate with UPS host. When the lithium battery is fully charged, it will automatically detonate from the UPS charger, and traditional UPS software programs may think that the battery is defective and issue a warning. Therefore, it is necessary to perform strict matching tests on the lithium battery UPS and update the firmware of the lithium battery UPS before use. 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.