Research And Design Of Mine Rescue Capsule With Lithium Battery Management System

Domestic battery management system(BMS) is mostly applied in electric vehiclescurrently and the application of battery management system in the coal mineequipments and power supply system of large capacity in mining lifesaving equipmentsis on starting stage，therefore, it’s necessary to develop a battery power of large capacityapplied in mine capsule and other emergency equipment.The research and implementation of this project includes three parts:the algorithmresearch of state of charge of batteries, hardware design and software design. Thissystem adopts embedded technology and develops a lithium battery managementsystem applied in mine rescue capsule. The system consists of master controlboard,slave control board,battery information display module and battery chargingcontrol module which can real-time monitor the parameters and the running state ofbatteries,in this way, it can automatically diagnose the reason of the problem and makecorresponding protect action when fault occurs, at the same time, the LCD will displaythe dynamic parameters and fault information of batteries which make it convenient forstaffs to maintain the battery on time and effectively.When the external power supplydisappears, the master control board can detect this signal in0.1second and switch tothe battery power supply to ensure the continuous and uninterrupted work of minerescue capsule，then guarantee the miners’ living conditions.This BMS can also make anestimation of the state of battery charge,when the battery power is insufficient，themain control board notifies peripherals charger to charge for the batteries throughCAN.The main control board uses ARM chip LPC1758to design MCU hardware torealize the functions of the collection of the total voltage,total current,battery SOCestimation, battery charging control and communications between slave control boardand the LCD screen.The slave control board selects Silion C8051F500as its MCU torealize the functions of collecting the monomer battery voltage andtemperature,equilibrium control of series battery pack and communicates with the maincontrol board through CAN. This project uses extended kalman filter(EKF) algorithm toestimate the SOC of battery, sets up the module in Matlab Simulink and verifies the effectiveness of the EKF method in battery SOC estimation through the simulationoutput curve.This thesis detailedly introduces the working principle of lithium-ion battery andestablishes the battery model, makes a study on the battery SOC estimation algorithmand introduces the hardware and software design process of battery management systemin detail according to the module function. Finally the battery management systemapplied in the mine rescue capsule is successfully developed and achieves the expectedeffect after debugging.