Research On Battery Management System In Mobile Refuge Chamber

Mobile refuge chamber is one of the important emergency safety device in mine,and it plays an important role in the construction of emergency actions system. Rescuechamber back-up power system is one of the "six systems", and it’s also the key towhether the rescue chamber can complete the rescue mission successfully. But theRescue chamber’s space is narrow, so the battery size is not too large. And the capacityis limited, it’s impossible for unlimited use. Therefore, the rescue chamber’s backupbattery rational and effective management is essential.In this thesis, the battery management system of mobile refuge chamber wasstudied. Firstly, in order to determine the battery’s capacity, this thesis calculated thecapsule’s power consumption. Then analyzed the main features of the BMS in details,including data collection, system fault diagnosis and protection, battery cell balancing,battery SOC estimation and battery operation mode. This thesis provides basis for faultdiagnosis, adopts dissipative equalization scheme to solve the inconsistency of thebattery. And combines open circuit voltage, Ah and extended Kalman filter to meet thesystem SOC requirement. According to the SOC estimation, this thesis designs severalbattery operations: intelligent power-saving, extreme power-saving, manual mode.The battery SOC estimation is not only the core of the BMS, but provides basisfor decision-making for the master control system of the rescue chamber. This thesisstarted from the influence of the Lithium battery SOC, established the correspondingcompensation models of SOC. It used open circuit voltage method to estimate the initialcapacity of the battery, the other factors as the system noise, then adopted the extendedKalman filter method to filter SOC in systematic observation noise environment, itimproved Ah method estimation accuracy.Then, this designed the hardware and software of the BMS, and analyzed eachunits in detail. The system bit machine using low-power microcontroller as the masterchip, PC designed the visual interface to display the battery’s information. Finally, theexperiments show that the system can manage the rescue chamber’s battery effectively.