Research Of Efficient Management For Lithium Battery String In Mine-used Lifesaving Cabin

Mine-used lifesaving cabin is a key technology to study and resolve major disasters in mining enterprises. In order to ensure that mine-used lifesaving cabin can be used normally when a mine disaster occurs, it needs to be equipped with uninterrupted power supply. Because the lithium battery has the characteristics of higher mass ratio, higher volume ratio, no memory effect and longer service life, it became a capsule power supply uninterrupted power supply of the preferred material.Firstly, this article introduces the present situation of the application of lithium batteries and the domestic and foreign research status quo of battery management system. It adopts the lithium iron phosphate battery as the research object, and explains briefly its working principle. Then this paper introduces the key performance and characteristics of the lithium battery. It illustrates mainly the lithium battery charge characteristics, discharge characteristics, temperature, and ratio. A complete battery management system includes five parts. Our main study is the battery state detection, SOC assessment and equalized control management. For battery SOC estimation, we proposed a new algorithm of combining Ah metrology, open circuit voltage method and extended kalman filtering algorithm. At the same time, to suit the kalman filtering algorithm, we use the composite model to model the battery. Due to each of the cell in the battery pack in the inevitable inconsistencies, we need to join equilibrium control management structure into system. Based on the non dissipative bilateral equalized control circuit, the superfluous energy between adjacent two cell battery can be flow bilaterally to reduce the energy loss. In addition, in order to control switching of switch tube, we also join in the design of driving circuit. In system hardware design, we adopt TMS320LF2407as the main controller. Peripheral circuit mainly includes design of signal acquisition and serial communication circuit. Signals need to be collected includs cell battery voltage, battery pack voltage, battery pack current and battery pack temperature. Serial communication circuit adopts design of RS-485interface, to meet the long-distance communication in industry control requirements. In the software design, we use the timer interrupt to collect data, and to call other subroutines. Finally, we use MATLAB to simulate and verify the feasibility and estimation accuracy of the SOC algorithm. Simulation results show that the algorithm can be carried out on the error correction, and achieve a good estimation effect. For equalized control circuit experiment, it compares with the other two equalized control circuit. It shows that the equilibrium structures are improved greatly in the equilibrium properties and time. At the end, there is a summary and scope for this paper.