锂离子电池容量动态测量研究

Dynamic Capability Measurement of Li-ion Battery

为提高锂离子电池容量动态测量的准确性,利用单片机系统处理采集到的电路开端电压和回路电流,根据最小二乘法得到电动势与内阻.实验数据表明,电动势并不是与荷电状态(SOC)成线性关系,但是在较小的区间内可用线性方法处理.由于锂电池的化学特性,在温度较高或较低时,电量测量误差较大,并且随着电池的老化,内阻对电量测量影响也会变得明显.在考虑温度补偿和老化修正的基础上,对测量结果进行校正.

In order to improve the accuracy of dynamic capability measurement of Li-ion battery, a single chip microcomputer system was used to process the collected loop current and terminal voltage, and the electromotive force and internal resistance were obtained based on the least square method. Experimental data show that the electromotive force is not linearly related to the state of charge （SOC）, but the linear processing method is still available in a small interval. Because of the chemical characteristics of Li-ion battery, there will be a large measure error at different temperatures. Along with the aging of Li-ion battery, the internal resistance also affects the result obviously. Considering the temperature compensation and aging correction, the measurement result was corrected.