RESEARCH ON EQUILIBRIUM STRATEGY FOR LITHIUM-ION BATTERY PACK

In order to meet the performance of PEV demand, the car's energy was provided by series of power batteries. This paper points out the significance of the balance management. As the lack of traditional evaluation system of consistency which based on the battery voltage difference, this paper expounds on consistency problem of battery from DC internal resistance, polarization voltage, SOC and capacity. According to the target of increasing battery capacity utilization, balance strategy is proposed based on the capacity and SOC. Finally, According to the on-board and online balance requirements, algorithm has been embedded into the circuit which based on the SOC strategy. An experiment platform has been put up to test the strategy. And the effectiveness of strategies has been verified.