| At present, the power battery technology has become one of the key factors influencing the scale of the development of the electric vehicles, and how to effectively monitor and manage the battery has been a key research content in power battery technology.This paper is based on achieving effective monitoring and management of power battery, Mainly studies the battery current data of high accuracy synchronous monitoring and battery packs equalization control.In the aspect of power battery current data of high accuracy synchronous monitoring, This paper completed the implementation of monitoring system of power battery current which based on Freescale intelligent battery sensor MM912J637 and MC9S12XS128 microcontroller, using the LIN communication. A host-slave architecture was adopted by the monitoring system,designing the hardware and software of the current detection unit and the main control unit according to modularization thinking, and completing the system precision, linearity, repeatability and speed performance test in the experimental platform. Through the analysis of the test data shows that the system can meet the accuracy and real-time requirements of the acquisition of electric vehicle power battery current data, at the same time the system provides the hardware platform and software interface for further battery state of charge(SOC) estimation,and with good functional expandability.In the aspect of battery equalization control, based on the analysis of cell imbalance and the research of existing balanced control method, considering the cost, size, efficiency and other factors, this paper selected the circuit with the energy-storage inductance as the basic balancing circuit. Designing reasonable balancing variable and strategy according to the power battery operating characteristics and circuit topology structure, then determining the basic parameters of equalization system components through the analysis of the circuit principle. In case of the battery pack in different voltage distribution and work stage, the equalization system were verified by MATLAB simulation, simulation results show a lower cell imbalance and a higher capacity utilization rate. |
PDF Full Text Request