基于改进安时积分法的锂电池SOC估算与仿真

SOC Estimation and Simulation of Lithium Battery Based on Improved Ampere-hour Integral Method

汽车产业的飞速发展,使得全球的能源与环境问题更加突出。为了使得汽车行业能够持续发展,各个国家都进行了交通能源的转型。新能源电动汽车成为了未来汽车行业发展的重要方向,而作为电动汽车动力源的锂电池是制约新能源电动汽车发展的关键技术之一。对锂电池的管理与控制,进行电池荷电状态(SOC)的估算是十分必要的。本文首先选择确立了电池的二阶RC等效电路,采用改进安时积分法,即将开路电压法和安时积分法结合,还考虑温度以及充放电效率对二阶RC等效电路模型的影响,对电池的SOC进行了估算。通过Matlab/Simulink工具箱进行SOC算法的仿真,仿真结果验证了算法的可行性。

The rapid development of the automobile industry makes the global energy and environmental problems more prominent.In order to make the automotive industry could develop continually;various countries have carried out energy transformation.New energy electric vehicles have become an important direction for the future development of the automotive industry,and as a power source of electric vehicles,lithium battery is one of the key technologies which restrict the development of the new energy electric vehicles.Fo「management and control of the lithium battery,the state of charge(SOC)of the battery estimation is very necessary.This paper first chooses to establish the second-order RC equivalent circuit of the battery,and use improved ampere-hour integral method to combine the open-circuit voltage method and the ampere-hour integral method.We also consider the influence of temperature and charge-discharge efficiency on the second-order RC equivalent circuit model,then estimated the SOC of the battery.The simulation of SOC algorithm is carried out by Matlab/Simulink toolbox.The simulation results verify the feasibility of the algorithm.