Battery Management System Of Hybrid Electric Vehicle Based On DSP

In 21 century with increasing of the problem of environment and energy sources, Because of the advantage of low emission and low noise, Hybrid electric vehicles(HEV) gets extensive attention in recent years in many countries.The battery management system play an important role in the develement of electricvehicles technology. It is the key technology which strengthen the commercial andpractical of electric vehicles .This paper applay itself to the research of the Battery management system (BMS) of Hybrid electric vehicles and deeply introduce the thoughts about the system desige and it's relized-method, at the same time, this paper put forward the different kinds of state-of-charge(SOC) measuring methods.Having analyzed the electronic mechanism of the MH/NI batteries during charge and discharge, compared the advantages of MH/NI batteries with other kinds of batteries, the result is MH/NI batteries is the promising power battery for HEV due to its advantages such as high power lever and long life.Principle of the reaction of the MH/NI battery, the characteristics and existed problems of different kinds of SOC(state of charge) measuring methods are compared. Since the actual SOC(state of charge) of MH/NI battery is influenced by many factors, such as temperature, cycle of discharge and aging of battery, it is difficult to obtain ideal results by traditional methods,then put forward the way to estimate SOC(state of charge) of the batteries in this research. We used TMS320LF2407A as the microcontroller, using the sensor to collect data of voltages, temperature and current of batteries, transcend them on 2-ports RAM,designd signal management and insulation circuit ,and give the design of the relevant hardware and software.The Battery management system (BMS) which this paper has introduced is reliable and economical. The estimation method of the SOC(state of charge) is authentic.