Four safety considerations for UPS lithium batteries

As the last barrieres to data center power systems, new battery technology is sparking a huge new energy revolution. In recent years, Uptime global data center survey data shows that 10% of data centers choose lithium-ion batteries (hereinafter referred to as lithium-ion batteries) as the energy storage equipment for UPS. Compared with lead-acid batteries, lithium-ion batteries have unparalleled technical advantages: the energy density of lead-acid batteries is several times that of lead-acid batteries, which reduces the space occupied by lithium-ion batteries by more than 60%; components are reduced by 70% Above; strong high-temperature adaptability; fast charging after discharge, the cycle times is 4 times that of lead-acid batteries. The 10-15-year long-life planning and high cycle times make the UPS no need to replace lithium-ion batteries during the 10-year life cycle, reducing maintenance and replacement costs, ultimately helping users reduce TCO and achieve maximum business value. Schneider Electric: Considering the safety of lithium-ion batteries from four perspectives Four safety considerations for UPS lithium-ion batteries BEIJING, Jan. 2, 2019 (PRNewswire) -- As the last barrier to data center power systems, new battery technology is sparking a huge new energy revolution. In recent years, Uptime global data center survey data shows that 10% of data centers choose lithium-ion batteries (hereinafter referred to as lithium-ion batteries) as the energy storage equipment for UPS. Compared with lead-acid batteries, lithium-ion batteries have unparalleled technical advantages: the energy density of lead-acid batteries is several times that of lead-acid batteries, which reduces the space occupied by lithium-ion batteries by more than 60%; components are reduced by 70% Above; strong high-temperature adaptability; fast charging after discharge, the cycle times is 4 times that of lead-acid batteries. The 10-15-year long-life planning and high cycle times make the UPS no need to replace lithium-ion batteries during the 10-year life cycle, reducing maintenance and replacement costs, ultimately helping users reduce TCO and achieve maximum business value. Schneider Electric: Considering the safety of lithium-ion batteries from four perspectives Low-temperature lithium iron phosphate battery 3.2V 20A Low-temperature lithium iron phosphate battery 3.2V 20A -20℃ charge, -40℃ 3C discharge capacity≥70% Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate≥70% Click for details In my country, the trend of UPS turning to lithium-ion batteries will be more rapid. Schneider Electric, as a leader in global data center infrastructure solutions and services, through precise positioning and research on shopping malls, found that in addition to the purchase price factor, the key point for Chinese customers to choose UPS lithium-ion batteries is safety. As the largest energy storage element in data centers, the safety of lithium-ion batteries depends largely on the following four points. Schneider Electric recommends that users should pay attention to the following points when choosing: 1. High-quality battery production and quality control At present, the world's outstanding lithium-ion battery manufacturers have chosen advanced active production lines, and only through high-quality production process control can the high quality and consistency of batteries be guaranteed. After the production of lithium-ion batteries, the demand will exceed one battery module (commonly known as a module) through series and parallel, in this process, to connect the positive and negative terminals of the battery, large manufacturers usually choose laser welding machine welding for the terminal to reduce contact resistor to ensure the stability of the terminal connection. However, small manufacturers choose the compression method of manual bolts and nuts in the whole process, which is difficult to ensure the firm connection of the terminals, which may bring trouble to the long-term operation in the future. Due to the strict quality control of lithium-ion batteries, compared with lead-acid batteries, the cycle life of lithium-ion batteries has been improved, and many big-brand lithium-ion batteries can be guaranteed for 10 years in the data center field. 2. Perfect BMS planning BMS (Battery Management System) is the core skill positioning for the safety of the entire lithium-ion battery system. When the battery has faults such as over-voltage charging, over-current discharging, battery short-circuit, etc., the fault current can be quickly cut off through the BMS to prevent the risk of battery heat loss. Schneider Electric believes that a lithium-ion battery BMS should not only monitor the voltage and current temperature of each cell in real-time supply analysis of battery health trends, but more importantly, it can actively balance the charging and discharging of cells, ultimately improving the consistency of each cell, Prevents the entire battery from failing due to the barrel short board effect. At present, the lithium-ion battery manufacturers of international first-line brands are planning to produce BMS by themselves to ensure the function matching of the battery and the BMS and the safety of charging and discharging. 3. Lithium-ion battery chemistry data For data center UPS, due to its application characteristics such as high current discharge time, high discharge power, long-term standby electric floating charging, etc., more suitable skills are lithium iron phosphate, lithium manganate, NCM ternary lithium, and other skills. In my country, ternary lithium and lithium iron phosphate are the first two products on the market. Although there are controversies over energy density and safety, it is undeniable that these controversies are limited to the theoretical function of the positive data for Li-ion batteries. Schneider Electric believes that the safety of lithium-ion battery systems should comprehensively consider many factors such as negative electrode data, electrolyte, and diaphragm d. 4. Compatibility test of lithium-ion battery and UPS Unlike lead-acid batteries, lithium-ion batteries are equipped with a BMS, which is a smart battery capable of self-regulating and communicating with the UPS host. When the Li-Ion battery is overcharged, it automatically detonates from the UPS charger, which traditional UPS software programs may interpret as a battery failure. More importantly, the charge-discharge voltage, current, and cut-off voltage of different lithium-ion batteries are different. For example, the extra voltage of a lithium iron phosphate battery is 3.2v, while the extra voltage of a ternary lithium-ion battery is 3.8v. Therefore, the UPS should carry out a strict matching test before using the lithium-ion battery, and the UPS firmware of the lithium-ion battery should be updated. It is worth mentioning that the UPS launched by Schneiderelectric in recent years now has lithium-ion battery compatibility. The high-speed lithium-ion battery used by the UPS can be charged and discharged with a large current in a short time, which is in line with the change in UPS charger planning and demand habits. Schneiderelectric's new GalaxyV-series UPS can supply up to 40% more power to the UPS (compared to 10 to 15% for a traditional UPS), so, in theory, a powerful charger can charge a lithium-ion battery from 30 minutes to 1 hour. As lithium-ion battery technology becomes more mature and cost-effective, UPS will rapidly transition from lead-acid batteries to lithium-ion batteries. Since 2012, the world's first lithium-ion battery data center has been put into use, Schneider Electric has been a leader in advancing lithium-ion battery technology in the data center application category, with a strong brand and technological innovation, walking in New data center energy technologies are at the forefront of change and leadership throughout their careers.