中文摘要：

在铅酸蓄电池充放电过程中，准确估计其剩余容量，对充放电控制器采取下一步动作具有非常重要的指导作用。提出采用牛顿插值法，构造出逼近函数，表述了端电压、电流和电池放电容量间的定量关系。该方法具有递推性，其函数组成有规律，方便实际计算，并能通过选择不同的节点个数达到不同的工程精度要求；具有较大的灵活性和较小的运算量，而且易于计算机编程实现，为电池管理系统提供了一种新的预测方法。

英文摘要：

In the process of charging and discharging for lead acid battery, how to accurately estimate residual capacity is vital for controller to take the next action.The author creatively applying Newton interpolation method in constructing the approximation function,successfully expressed the quantitative relationship between terminal voltage, current and battery discharge capacity.This method has merits in recurrence properties, and corresponding function composition has rule which is convenient in practical calculation,what＇s more ,applying Newton interpolation method in constructing the approximation function, you could achieve distinct requirements of engineering accuracy by selecting different node number.It has greater flexibility with smaller amount of computation, and is easy for computer programming.This new prediction method is meaningful for battery management system.