Design And Implementation Of Battery Management System For Electric Bus

Vehicle emission is an important source of urban pollution. The development of zero-emission Electric Bus could reduce urban pollution. As an important manifestation of Beijing "Green Olympics", "Scientific Olympics", the item of Electric Bus has been supported by Beijing Municipal government and CST.Battery Management System of Electric Vehicle battery technology is a hot research at home and abroad. This paper describes the design and implementation of BMS in pure lithium battery Electric Bus.The distribution topology is used on this system.Every battery box is equipped with detection module which will send the necessary battery data to the main control module through internal RS485 bus.The main control module analyses and stores battery data such as voltage and temperature, then send these data to vehicle devices by CAN buses. The design of the major features in the main control module is imposed on the insulation detection module which can be online monitoring and remind drivers of current insulation status of Electric Bus through LCD display.Firstly the system hardwares are described in detail on the preceding chapters of this paper, including the detection module, the main control module, insulation detection module and communication module. Secondly the parts of software focus on a few important functions, such as insulation detection, voltage detection, master-slave communication, and so on. Then the debugging result and analysis of relevant data of the battery management system are introduced, also including some auxiliary equipments of this system. The writer's hope and advice on the further development of BMS are given at the end of this paper.Currently, the system has been installed on the earlier seven testing buses whose accumulated mileage reached nearly 100,000 km, and has achieved good effects.All base a good foundation for the next phase of mass production.