Research And Design Of Battery Management System For Rail Transit Vehicles

The rapid economic growth and the acceleration of urbanization have promoted the rapid development of China's high-speed rail,trains,subways and other rail transit vehicles.With the ever-changing new energy technologies and the continuous advancement of on-board energy storage technologies,new energy-saving and environmentally friendly rail transit vehicles are a major trend in the construction of a green and energy-saving integrated transportation system.As a new energy storage element,lithium batteries stand out from many batteries due to their advantages of safety,environmental protection,high specific energy,high specific power,and long life,and are increasingly used as energy storage devices in rail transportation.In the process of using lithium batteries,various state parameters need to be monitored and managed in real time.Therefore,it is particularly important to design a battery management system that matchs the rail vehicle.This article relies on the "12th Five-Year Plan" National Science and Technology Support Program "Next-Generation Metro Vehicle Technology Research and Demonstration Application" to study the next-generation metro vehicle on-vehicle energy storage system and analyzes the the specific functional requirements of the vehicle battery management system for rail transit vehicles combining the application of the characteristics of lithium batteries in rail transit.Meanwhile this article select the appropriate battery management system topology and determines the overall design of the rail transit vehicle battery management system,that is,the master-slave battery management system consists of a master control unit and a slave control unit.Defining the specific functions that the master control unit and slave control unit should have,and then according to the detailed information of the next-generation metro vehicles,analyzing the communication architecture of the system and formulating relevant SOC estimation,balanced control,and thermal management strategies.When designing the hardware circuits of the master control unit and the slave control unit,this article focuses on high-voltage isolation and electromagnetic compatibility technologies for rail transit high-power,complex operating environments,and diverse communication interfaces.In the design of the system's software,modular and layered ideas are used to accurately implement various control strategies of the battery management system in software.Finally,a battery management system test platform is built to test the functions of each module on the circuit board,and the system software and hardware are adjusted to verify the reliability of the rail vehicle battery management system designed in this paper.