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Application of integrated lithium iron phosphate battery in outdoor communication station

by:dcfpower     2021-03-16
u003cpu003e After several years of development, the application of lithium iron phosphate batteries in the communications industry has moved from the pilot stage to the small-scale application stage. Compared with lead-acid batteries, the performance advantages of lithium iron phosphate batteries in terms of cycle life, operating temperature, weight ratio energy, volume ratio energy, etc. are well known, and there are many articles comparing related parameters, so I will not repeat them here. This article analyzes and explores the current network application scenarios, installation and construction, and parameter settings of iron-lithium batteries in the region. 1. Classification of lithium iron phosphate batteries According to the number of single-cell batteries, there are 15-series and 16-series battery packs. Due to the relatively good low-temperature characteristics, China Mobile Communications Group Zhejiang Co., Ltd. Hangzhou Branch currently uses 16-series batteries. This article is based on 16-string lithium iron batteries to discuss. Lithium iron phosphate batteries are classified by application into integrated and discrete battery packs; according to the different combinations of battery packs and battery management systems, China Mobile Communication Base Station Lithium Iron Phosphate Battery Enterprise Standard (QB-H-005-2012) There are mainly three modes in the game. (1) IBS mode: an integrated battery pack consisting of 16 small-capacity lithium iron phosphate batteries in series and a battery management system in the same device. (2) LBMS mode: It is composed of 16 large-capacity lithium iron phosphate batteries in series and a battery management system. The battery management system can be installed independently or in a discrete battery pack in a switching power supply system. (3) LBAM mode: a discrete battery pack composed of 16 large-capacity lithium iron phosphate batteries connected in series and a battery acquisition module. The protection and alarm functions of the battery are completed by the switching power supply system. At present, the IBS model has been applied in batches in Zhejiang Province, and the latter two models are only in the sporadic pilot phase. The author believes that the latter two models have not been promoted, mainly due to the high price and the industry standards for discrete lithium iron phosphate battery packs for communications have not yet been introduced. 2. The application of outdoor communication station The current IBS mode lithium iron phosphate battery technology is relatively mature, and the conventionally used single battery capacity has 10 Ah, 20Ah, 30Ah, 50Ah, as a replacement and supplement for lead-acid batteries. According to the characteristics of high temperature resistance and high rate discharge of iron-lithium batteries, they are mainly used in harsh environments such as indoor distribution, WLAN, and outdoor cabinet stations. Among them, due to the large environmental temperature difference of the outdoor cabinet site throughout the year, especially the high temperature in summer, frequent theft and other reasons, the current network backup power supply of this type of site is severely guaranteed and the cost is high. Outdoor cabinets in this area use ventilation or heat exchange. The temperature in high-temperature battery cabinets in summer can be as high as 55°C, and a few cabinets are even higher. Lead-acid batteries are generally replaced in two years. At the end of 2012, the outdoor base station of Qiantang Tourism Company replaced the original 200 Ah lead-acid battery with a 150Ah integrated lithium iron phosphate battery as a pilot. After two years of testing, the performance of the iron-lithium battery pack is still good. Calculated according to the province's centralized procurement price this year, the price of 150Ah iron-lithium battery pack is 11,400 yuan, and the original brand 200Ah lead-acid battery is 5,040 yuan per group. The iron-lithium battery has a 6-year warranty, and 3 sets of lead-acid batteries need to be replaced within 6 years. The total cost is 15,120 yuan, including replacement and logistics costs. In addition, the stolen rate of lead-acid batteries in outdoor stations is very high. Because iron-lithium batteries are emerging products, the recognition rate is low, and there is no channel for stolen goods temporarily, so the stolen rate is very low. In the medium and long term, the promotion of the use of integrated lithium iron phosphate batteries in outdoor stations has the effect of reducing costs and increasing efficiency. Through exchanges and understanding, similar situations also exist in other areas of the province. It can be seen that the demand for replacing lead-acid batteries with lithium iron phosphate batteries in outdoor stations is particularly urgent. u003c/pu003eu003cpu003eFigure 1 Schematic diagram of intermittent charging methodu003c/pu003eu003c/pu003e
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