Research On Management System Of Power Li-ion Batteries

With the rapid development of the Li-ion battery technology and the Li-ion batteries are widely used as the power batteries, the cycle life and safety capability of Li-ion batteries have become the primary problems to hinder development. Currently the battery management system (BMS) was focused in the study for its mitigating the adverse effect of these problems.The BMS, including the electric quantity management subsystem, the status management subsystem and the balance management subsystem, was studied in this paper, and the safety capability of the Li-ion batteries was improved and the cycle life of the Li-ion batteries was prolonged.The investigation on the accuracy of current sample and the gauge arithmetic indicated that the gauge arithmetic was kept within5%by the modification of the battery voltage and the compensation with other factors.The research of lOw power dissipation of the BMS showed that the power dissipation was halved. The protection value was set with the adaptive modification of the temperature, and the fault state was showed by outputting the fault code.In the balance management, the hardware was more practical and effective, and the software design fully reflected the characteristics of the hardware. The decay of the worst performance of the battery pack was greatly alleviated, and the life of the battery pack was improved.The results showed that the indicators of the management system had met the result as we expected.