The Design Of Lithium Ion Battery Management System

With the increase of automobile amount, the environmental impact of vehicle emissions is also more and more serious. In order to alleviate environmental pressure, pure electric automobile has become the future direction. Pure electric vehicle take battery as an energy storing device. Lithium-ion battery for its superior performance is gradually becoming the market mainstream. At the same time, the safety of lithium-ion batteries have become an important factor constraining the development of pure electric vehicle. Because of safety and high cost, the usage of power battery is limited. It’s need to be managed and controlled so as to get low cost and prolong its cycle working life and make sure its safety. Therefore the management system of battery plays a key role in the pure electric automobile.The distributed management is used in this paper due to there are many vehicle-mounted power battery which are lithium ion battery and needed to controlled separately. MC9S12XEG128is chosen as the main board MCU and9S08DZ60as the slave plate MCU. The schematic diagram and PCB are designed according to the battery management system. The entire work consists hardware and software.The hardware is mainly to achieve every module function of the battery management system. The entire project of management system is finished and the circuit modules include control、data collection、power and communication module. Among them the communication module uses CAN network which consists of interior CAN and exterior CAN.The software part: Using C language, I program and debug in Code Warrior IDE development environment of Freescale. Its main function: initialize the program for MCU, PIT, AD module; AD sampling and adjustment program; SOC estimation program, CAN communication program.The system needs to debug in the end and the experiment results show that the utility and strong antijamming capability of hardware can meet the accuracy requirement. The software system is simple and efficient which satisfies reasonability and stability requirements. The debug result is good and can meet the operating requirement of battery management system.