In this paper, a typical BMS block diagram has been proposed using various functional blocks. The state of charge(SOC) estimation has been implemented using Coulomb counting and open circuit voltage methods thereby eliminating the limitation of the

锂电池荷电状态(SOC)的精确估计一直是电池管理系统的核心任务之一。电流传感器中存在非零均值的电流漂移噪声,这些噪声会造成不可避免的估计误差。为减少电流漂移噪声对估算造成的不利影响,提出了联合扩展卡尔曼滤波法,以Thevenin模型为锂电池等效电路模型,将电流漂移值作为状态变量与电池SOC进行同步预测。实验和仿真结果表明,该方法能有效抑制电流漂移噪声,提高估算精度。(The accurate estimation of the charge state (SOC) of lithium batt