Application and four advantages of iron-lithium-ion battery communication power supply in mobile base stations

Application of Lithium-Ion Battery for Communication Power in Mobile Base Stations. Lithium-ion phosphate battery is a new type of battery made of environmentally friendly materials. It has the advantages of small size, light weight, high energy density, long life, high and low temperature resistance, and good safety performance. , Environmental protection, pollution-free and other advantages, compared with lead-acid batteries used in base station applications, it has incomparable superiority. The lithium iron phosphate battery belonging to new energy materials has been listed as a national key scientific and technological strategic project, and financial and technical support has been increased. It has begun to be promoted and applied in the fields of wind photovoltaic power generation, communication base stations, and new energy vehicles. At present, the application of lithium iron phosphate batteries in my country is gradually shifting from civilian use to industrial applications, that is, from batteries such as PCs and power tools to power lithium batteries and energy storage batteries. In terms of energy storage, mobile base stations, smart grids, solar distributed power generation, wind power, etc., use lithium-ion battery packs for energy storage. Communication base stations are now an important part of people’s lives. As far as communication base stations are concerned, they serve people’s communications all the time. The system is an intelligent unattended power supply system, which is embedded in the cabinet of the electrical equipment as a component of the electrical equipment, and is suitable for small-capacity access network equipment, remote switching equipment, and mobile communication equipment. , Transmission equipment, satellite ground station and microwave communication equipment, etc. It has the functions of centralized monitoring, battery maintenance and management to meet the requirements of unattended or few people on duty. Currently, most base stations use new lithium-ion battery packs, because lithium-ion batteries have huge advantages over traditional lead-acid batteries. Four major advantages of lithium iron phosphate battery packs used in mobile base stations Compared with lead-acid batteries, lithium iron phosphate battery packs have the advantages of light weight, high and low temperature resistance, long life, safety, environmental protection, and pollution-free. 1. Ambient temperature Excessive ambient temperature has a great impact on the service life of VRLA batteries. When the temperature rises, the plate corrosion of the battery will increase, and more water will be consumed at the same time, which will shorten the battery life. The battery can obtain a long life under the environment of 25℃. If the long-term operating temperature increases by 10℃, the service life will be reduced by about half. In addition, when the ambient temperature is 25°C to 0°C, the discharge capacity will lose about 1% for every 1 degree decrease, so the battery should work in an environment of 15°C to 20°C. The operating environment temperature of the lithium iron phosphate battery pack is -20℃ to 70℃. In the colder winter season, the indoor temperature of the base station can be as low as -15℃, and the indoor temperature of the base station can reach 50℃ in the hot season. In this temperature range, phosphoric acid Lithium iron batteries have very good performance. The impact of ambient temperature on the energy storage electric lithium iron phosphate battery pack is much smaller than the impact on lead-acid batteries. 2. Overcharged and over-discharged lead-acid batteries are overcharged, the positive electrode is consumed due to oxygen evolution reaction, water is consumed, and H + is added, which causes the acidity near the positive electrode to increase, the grid corrosion accelerates, and the grid thins and accelerates the battery Corrosion reduces the battery capacity; at the same time, due to the increased water loss, the battery will be in danger of drying out, thereby affecting the life of the battery. The energy storage electric iron phosphate lithium ion battery pack is equipped with a battery management system. The battery management system can monitor the voltage of each single cell in the battery pack and the total voltage of the lithium ion battery pack. During the charging and discharging process, the total voltage reaches the set value Or the cell voltage reaches the set value, and the management system can stop charging and discharging in time, so that the iron-lithium-ion battery pack will not be overcharged or overdischarged. 3. The floating charge current supplied by the switching power supply of the long-term floating charge DC system has three purposes for the valve-regulated battery: supplying daily load current, supplementing the loss of battery self-discharge, and maintaining the oxygen circulation in the battery. If the battery is only charged but not discharged under a long-term floating charge state, it will inevitably cause the anode plate of the battery to be passivated, increase the internal resistance of the battery, and greatly decrease the capacity, which will cause the service life of the battery to decrease. In addition, the selection of the float voltage of a lead-acid battery should be adjusted according to the state of the battery. Improper float voltage may cause overcharge, affect the battery's service life, or make the battery under-charged for a long time. u003dThe self-discharge rate of lithium iron phosphate batteries is very low, and the capacity retention rate can be 98% after 30 days of storage. Therefore, the Li battery pack is in a floating charge state for a long time, and the floating charge current supplied by the switching power supply is almost used for daily load current. The current used to supplement the self-discharge loss of the battery pack is very small. In addition, the lithium iron phosphate battery is not sensitive to the choice of floating charge voltage, and is inherently resistant to floating charge, making it more suitable for base station backup power supplies. 4. Cost of use The cost of using lithium-ion battery packs for communication mobile base stations requires comprehensive consideration of battery cost, battery life, maintenance costs during use, and so on. The price of lead-acid batteries is relatively low, but due to the short service life, in theory, most batteries that have worked for 7 to 10 years are damaged within 2 to 3 years, and some even fail to reach 1 year of life. In addition, during use, It requires manual inspection and maintenance, and the use cost is very high. 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: Introduction to the structure and characteristics of Ni-MH batteries