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Real-time Monitoring Of Electric Vehicle Battery Systems Design And Implementation

Posted on:2014-09-27Degree:MasterType:Thesis
Country:ChinaCandidate:G Y YeFull Text:PDF
GTID:2252330425967824Subject:Software engineering
Abstract/Summary:PDF Full Text Request
Based on pure electric vehicle power source-the management of lithium-ionbatteries to carry out the research work, this paper introduces the lithium batterymanagement system design process, analyzes the emphases and difficulties of thedesign process emphatically.Summarizes the battery management system (BMS) both at home and abroad, theresearch summed up the difficulty in current research of battery management system.The work characteristics of lithium battery are analyzed, and the overall design methodis introduced, the involved functions of battery management system are analyzed.Voltage and current sampling circuit was designed, the collected signal was inputto the MCU and also the input signals was analyzed, output signals control the externalcircuit according to the certain judgment conditions, so that each single battery voltageto achieve consistently, that means the voltage equilibrium, thus the life of the battery isprolonged, to improve the performance of the battery.The battery temperature detection and control circuit is designed. Batterytemperature data is collected through the temperature sensor, single-chip microcomputercontrol the temperature control unit to control temperature according to the collectedtemperature data, so that the battery environment temperature to achieve the ideal value,improve the performance of the battery.In order to make the driver to get the battery remaining power immediately, it isnecessary to estimate SOC(the charged state estimation), so you need to design thebattery SOC estimation circuit and estimation algorithms. This paper simulated the SOCalgorithm by using MATLAB/SIMULINK, and implementing the algorithm on themicrocontroller according to the simulation results.The CAN module is also need to be analyzed, the battery management system isdesigned to include two of CAN-inside CAN and body CAN. Inside CAN is mainly tohelp the local control unit to detect the voltage, current and temperature data to BMSmaster control module through the CAN. Vehicle body CAN exchange the body nodedata for BMS main controller, and because the body CAN is shared with the wholevehicle controller, the CAN module performance is very important to vehicleperformance, bad CAN nodes will affect the normal work of the vehicle nodes, so it is necessary for CAN communication module for a more detailed analysis and designverification.Finally, lithium battery and a good BMS system is connected for system debuggingtest certification. Experimental results show that the design of the BMS system CANcorrectly detected the voltage, current and temperature, and balance the battery voltageof each monomer according to the testing data, control battery environment temperatureto get the ideal data according to the collected temperature data, SOC test results meetexpectations, CAN network function and performance test show that the CAN modulemeet the design requirements.
Keywords/Search Tags:electric vehicles, Battery management system, The voltage equilibrium, Charged state, The CAN communication, Temperature monitoring
PDF Full Text Request
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