Design And Realization Of Battery Management System Based On CANopen Protocol

Along with the rapid development of automobile manufacturing and microelectronics technology, automotive electronics are gradually moving towards digital, network and intelligent direction. So far, CAN bus has the advantages of low cost, high stability, strong real-time and so on, which gradually become one of the main bus protocols of the battery management system and get more and more application of automobile manufacturers. Battery management system is the core technology of pure electric vehicle that directly affect the chemical performance and working time of the battery pack. It is also related to the performance and manufacturing cost of pure electric vehicle. The safety and stability of the battery management system based on CANopen protocol are good on the pure electric vehicle, which is the main direction of the development of battery management system in the future.This paper firstly introduces the background and significance of the research, and focuses on the description of the CAN bus and the increased application layer of the high level protocol. In this paper, the development of battery management system is studied and analyzed, and the CANopen protocol is defined as the communication protocol of the design system. Then the communication protocol is improved based on the existing battery management system. The issues select PSoC3 series CY8C3866 chip as the main control chip of the system, and choose LTC6803 chip as voltage acquisition circuit voltage detection chip. After describing the hardware design of the system, from the angle of modular programming, the system use C language for software programming, which can be divided into the main program design and subroutine design. In addition to the various elements of the software design, based on Labview, the monitoring platform of CANopen protocol is also prepared to realize the configuration of the protocol content itself. The software and hardware design of the battery information acquisition circuit and the CAN communication module are introduced in this paper. Based on the study of the existing battery residual capacity estimation algorithm, the improved algorithm based on double support vector regression is used to improve the speed and accuracy of the estimation of SOC value. Finally, the thesis describes the related tests of whole system, which include battery pack charge discharge test, current and voltage value acquisition test, CANopen protocol data transmission test and system automation test and so on. The test results show that the system has certain reliability and applicability.Design of battery management system provides a development model in the field of pure electric vehicles.