考虑综合影响的氢镍电池改进模型研究

Study on equivalent model and its influencing factors of Ni-MH battery

针对传统阻容等效电路模型不能直观反映电池内部的极化现象,提出一种带衰减因子的分段数学模型。在此基础上,进一步对温度、充放电速率、自放电、循环使用次数等影响因素进行研究,得到温度和充放电速率是影响氢镍电池性能的主要因素。通过对模型参数的修正,建立了考虑综合影响因素的氢镍电池等效电路模型。给出了电池参数的辨识方法,在Simulink中分别建立充电和放电模块。对比仿真与实测结果,该模型具有较高的精确度,并且适应性更广。

The classical battery equivalent circuit model cannot reflect the effects to battery terminal caused by electrochemical and concentration polarization,a piecewise mathematical model with decay factor was proposed. On this basis, the temperature, rate of charge and discharge, self-discharge, cycle times and other factors were analyzed, demonstrating that the first two factors are the main factors. A Ni-MH battery equivalent circuit model considering the comprehensive factors was proposed. The identification method of battery parameters was given,the charge and discharge modules were established in Simulink. By comparing simulation with experimental results,the model has higher accuracy and wider adaptability.