Optimum Design Of Battery Management System For Auxiliary Power Supply Of Standard EMU

With the acceleration of urbanization,rail transit develops rapidly.Under the "the Belt and Road" strategy,China’s high-speed rail has been recognized by the international community from the "Introduction" to "going out".The standard EMU is a self-developed high-speed EMU that is suitable for China’s railway operation conditions.Aiming at the problems existing in the existing auxiliary power battery management system,this thesis,relying on the related subjects of Chinese standard EMUs,has carried out in-depth research on the topology,hardware design and software design of the auxiliary power battery management system,proposed an optimized design scheme,and built an experimental platform.The related work is summarized as follows:Firstly,the characteristics of different battery management systems are analyzed,and the distributed structure of dasiy chain communication is proposed.The existing centralized and master-slave topologies will cause the inconsistency of the length of the acquisition wiring harness between modules,which will lead to the difference of the measurement accuracy of the individual voltage.In distributed topology,there are only communication lines between battery management systems,and the acquisition line can be closer to the battery side.In this thesis,the distributed topology of dasiy chain is used.In order to avoid the interference between the high and low voltage system,this thesis studies and designs the acquisition function of the high voltage system independent from the battery management system.In addition,in order to effectively realize the long-distance transmission of battery information,this thesis uses wireless communication mode.Secondly,the optimization scheme is proposed for the problems to be solved.According to the optimization scheme,the acquisition board for collecting individual voltage and temperature information,the high voltage board for collecting total voltage and current,and the control board for BMS information processing are designed.Complete each part of the chip selection,schematic drawing and PCB drawing,software programming and so on.Finally,a test platform is built.The functions of voltage and temperature acquisition accuracy and wireless communication of the acquisition board are tested,and the experimental scheme is verified.This article has a total of 49 figures,14 tables,51 references.