Based on the experiment of NiMH battery, investigations on characteristics of discharging and charging of NiMH battery, and analysis of influencing factor of NiMH battery, an approach of Ah-OCU has been built to estimate an accurate surplus energy and State of Charge of NiMH batteries. 在蓄电池试验的基础上,分析和研究了Ni-MH蓄电池充放电特性及其影响因素,建立了用安时开路电压算法(AhOCU法)预测蓄电池的剩余能量和荷电状态计算模型。