Research On Battery Management System For Hybrid Electric Bus

Electric vehicles, as a product of social development and the developmentdirection of modern automobile industry, can reduce energy consumption andenvironmental pollution effectively. Hybrid electric vehicles, don’t need specialestablishment of appropriate facilities and have less requirements in the powerbattery performance, have become the mainstream electric vehicles. The powerbattery packs as a key component in electric vehicles, it is necessary to monitor theirstatus and make a prediction or alarm to their possible failure by installing the BMS.Therefore, this paper introduces a design of BMS for hybrid electric bus.The thesis takes lithium-ion battery pack as the research object. On the base ofdetailed-understanding the secondary battery performance and analyzing the existingarchitecture and solutions of BMS, this paper presents the overall design of thedistributed BMS and introduces the proposed BMS in two aspects of hardware andsoftware. In hardware design, the principles of each unit circuit are analyzed in detailand the anti-jamming work on hardware is expounded. In software design, the mainprogram based on μC/OS-Ⅱ and the CAN communication protocol based on theSAE J1939are involved. In addition, the design adopts modular structure andpresents the program flow chart of the various modules.Finally, on the basis of the designed hardware and software, the samples ofBMS for hybrid electric bus are debugged and implementation is made on precisedetection of lithium-ion battery pack performance parameters, including the voltage,temperature, current and so on. Furthermore, it is tested about the stability andreliability of the designed BMS.