Polarization Characteristics of the Lithium-Ion Battery

In order to optimize the control strategy of the lithium-ion battery, some experiments were carried out to get the laws of the variation of polarization voltage in the different SOC, the rate of charge and discharge, the method of charge and discharge and ambient temperatures. The results show that the polarization voltage varies smoothly and the battery can accept the high rate of charge and discharge as 10%<B_SOC<80%; the higher the rate of charge is, the more obvious polarization phenomenon is in the low and high SOC and the stability region is smaller; the cumulative phenomenon of polarization voltages are not the same in different temperature, the lower the temperature is, the more obvious polarization voltage changes; the cumulative phenomenon of polarization voltage is obvious, especially for LiMn₂O₄.