CAN-bus Technology Applies In The Battery Management System

With the increasing of cars around the world, human's demands for energy is growing. Electric cars are the future direction of vehicles. More and more attention has been paid. In order to let a variety of electric vehicles compete with conventional internal combustion engine cars, the performance of power battery must be improve. Recently, the problem of power battery is, how to establish an suitable battery charge and discharge model, real-time monitoring of battery state of charge to prevent overcharge and over-discharge of the battery to extend battery life, and how to carry out real-time or regular battery automatic fault diagnostics and maintenance, the greatest degree of assurance that the battery level reliability. All these problems can be resolved through the development of effective and reasonable battery management system (BMS).Battery management system, due to the unusual circumstances surrounding, the poor work place in strong external power, noise and other interference, improvement in reliability of communication system has become the key to success of battery management system. The improvement in the reliability of communications systems can be divided into aspects. It includes hardware and software technology. Just using the hardware technologies, such as magnetic separation, coupling filtering, noise compensation, there are still some band interference invading systems and can not fully meet the application system requirements. Software anti-jamming technology is also needed. Hardware and software ingenious combination is the way to improve the reliability of embedded systems.This paper provides CAN bus communication reliability analysis and battery management system design based on hybrid power driving Bus EQ6110 test platform and CAN bus design for the BMS. Author also studies of various factors which impact system reliability. A CAN bus information scheduling model and Synchronous and asynchronous conception has been presented in the text. Different types of messages can be transmitted separately. Finally author presents the priority promoting scheduling algorithm. Living test confirm that the improved battery management system can be safely and reliably operated as we intended. The algorithm not only can improve the system performance of real-time communication and bandwidth utilization, also to a certain extent to avoid the appearance of the message deadlock.Finally, the author of this topic summarized the research work in the project and pointed out that further research on the subject of the future direction.