Freescale MCU-based Electric Vehicle Battery Management System

There are two major problems today, one is environmental pollution, the other is the energy depletion. With development and maturation of technology, electric cars will become famous for the advantages of energy saving and environmental. However, the main factors that hindering the electric vehicle is EV vehicle battery. As we all know, vehicle power battery is restricting the scale development of electric vehicle and largely increasing the price of electric cars, the cost of vehicle power battery accounting for more than 30% of the whole vehicle cost. Therefore, to solve the safety of battery, extending the life and reduce the cost to develop the appropriate electric vehicle battery management system is imminent.This thesis analysis the problems faced by electric car batteries above in detail, proposed objectives and tasks for the problems of electric vehicle battery management system and conduct a detailed needs analysis. Based on this, a systematically design are proposed, key points and key technologies analysis and description detailed after module design, the unit test for corresponding module and integration testing of each module will be described. Development processes using V model agile development model of software engineering, V model can be divided into several different stages, such as: needs analysis, outline design, detailed design, coding, unit testing, integration testing, system testing, acceptance testing. Battery management system can be quickly developed by V model for electric vehicle, shorten the development cycle and test cycle, savings cost, further minimize the cost of battery management system.System mainly consists of three modules: acquisition unit module, balanced unit module and display module. Communication between modules via CAN bus control unit to achieve control. Modules design uses the SOC estimation algorithm to make the system more reliable. Each module is designed in accordance with the SCM hierarchical to make testing more convenient, let the software more scalable, portable. Unit testing and integration testing are proposed in various modules of the system, and results are acceptable. A system summary and outlook are proposed.