Remote monitoring of lithium-ion battery application case analysis

Source: 2020 - 04 - 06 12:00 hits: first lithium battery remote monitoring application case study application background: in cooperation with mainland China some gas enterprise remote monitoring terminal as the application background, carry out research and exploration of intelligent battery. Launched in 2012, west to east gas pipeline project, is China's longest distance, the diameter of the largest gas transmission pipeline. It west lunnan area of tarim basin, east to shenzhen. The pipeline across nine provinces and regions, the total length of 4200 km. Due to the flammable and explosive properties of natural gas, natural gas pipe network monitoring has become a safe production line and the firewall. However, gas transmission pipeline through a lot of high altitude, desert, weather, terrain, it is subject to the monitoring equipment and power supply system is put forward very high requirements. For example, as a starting point in natural gas pipe network of xinjiang tarim basin, is a high altitude cold regions. Here weather very cold in winter, snow covered all year round. The average temperature in - 20 ℃ to - Between 25 ℃, the lowest temperature can reach - 50℃。 Gas transmission network is controlled by automation equipment. In many cases, the grid cannot cover, so need batteries to power supply. These devices are often very strict with power consumption. For example, the average working current of gas remote monitoring terminal is a few milliamps. This would require the smart battery system itself is extremely low power consumption to extend battery life, reduce the frequency of equipment maintenance. In addition, equipment distribution on longer gas transmission line, the distance from the station to work more than a few hundred kilometers, usually takes four to five hours' drive. In this case, replace the battery is not very convenient. Gas monitoring terminal and equipment work continuously, however, if forced to shut down, because of low battery may result in serious malignant accidents, causing massive losses of personnel and property requirements so BMS reliable capacity detection function, according to the arrangement of the battery remaining power science battery replacement and maintenance work, improve the maintainability of the equipment. Specific solutions: according to the application background and demand, and puts forward some gas remote monitoring terminal intelligent battery system design scheme of power supply battery one day. System requirements are as follows: ( 1) Intelligent battery output nominal voltage of 14. 2 v, output voltage of 16 when full. 8 v, battery capacity of 20 ah. ( 2) Suitable for extremely cold temperature environment. Lower limit for - application temperature 40 ℃, the maximum of 55 ℃. ( 3) Extreme cold ( - 40℃) Under the condition of multiplier (according to the standard 0. 2c) Discharge, the battery to discharge power accounts for more than 75% of capacity at room temperature. ( 4) Request system has the characteristics of ultra-low power consumption, - 20 ℃, the average working current is less than 400 ua. ( 5) Has overcurrent, overcharge, discharge, over temperature, short circuit protection function complete protection functions. ( 6) System has a relatively accurate power estimation function, the rest of the working time of the instrument based on the actual power consumption estimates. And can resist the influence of temperature and aging. ( 7) System can record abnormal, communicate with PC, and an exception and power shortage of early warning signals.