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Research on Key Technology of Battery Management System in Pure Electric Vehicle

Author: YangChunLei
Tutor: LiuZhiYuan
School: Harbin Institute of Technology
Course: Control Science and Engineering
Keywords: Battery Management Voltage detection Balance control Insulation testing
CLC: U469.72
Type: Master's thesis
Year: 2011
Downloads: 379
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Abstract

With the increasing number of the world car ownership, the environment and energy issues become increasingly prominent, electric vehicles will undoubtedly become a way to resolve energy and environmental issues. The battery management system as one of the three key technologies of electric vehicles, the real-time detection and management of the entire battery pack, is one of the core content of the electric car research. In this paper, a pure electric vehicle battery management research background, the key technology of the battery management system. First, the detailed description of the function of the battery management system, the management functions for the battery to be achieved, given the structural design of the entire battery management system, and gives the design and software structure design of the hardware structure of each functional unit, and then key technology to the detection of insulation in the local control unit cell voltage detector technology, cell balancing technology and battery pack snap-depth research, and finally build an experimental environment for local control unit and battery pack snap achieve the key technologies involved in the testing and validation. Existing detection method for the local control unit of the monomer battery voltage detector and the battery pack balancing control technology, first, and then out of the design on the basis of the existing methods for the detection of the object of this study the cell voltage circuit. For battery equalization techniques, the paper through the use of the flyback converter circuit, the current control circuit and a switch circuit design can be achieved on the arbitrary battery cell balancing circuit, the circuit is effective to reduce the voltage spike generated by the transformer and a circuit volume , and then analyze the characteristics of the battery, a current closed loop control of the equalizer controller is designed based on the design of the equalization circuit, and to improve the draw in the practical application in an engineering equalization method. Insulating state of the battery pack and the charging and discharging of the battery pack snap-current detection techniques, the paper analyzes the advantages and disadvantages of several typical insulation testing method, according to the results of the analysis given insulation detection circuit design. Finally, the overall battery voltage detection circuit and a detection circuit of the charge-discharge current to be designed to achieve the monitoring and control of the overall battery state and the charge-discharge process. In order to verify the design of the equalization algorithm, the effectiveness of the cell voltage detection circuit, the equalizer circuit, and the insulating detecting circuit, respectively, for the local control unit and the battery management unit structures experimental environment for functional and performance testing; the test results of the battery cell voltage show that the detecting circuit precision detection static or each cell voltage of the battery pack during charging and discharging The battery equalization results of the experiment show that the design of the equalization circuit effectively reduces the voltage spike generated by the transformer in the equalization process, the design of equalization algorithm effectively achieve the equalization of the battery cell; insulation resistance testing experiments show that the insulation resistance of the insulation testing circuit can be realized precision detection.

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