Overvoltage relaxation of lithium ion secondary batteries after current interruption

It is well known that the lithium secondary battery (LiSB) is the most promising power source for electric vehicle (EV), the further development is still needed to assure the life and performance prediction of LiSB. Mathematical modelling of overvoltage relaxation for batteries has been carried out by applying piggyback stacked dual transmission line as an equivalent circuit of electrode for commercially available batteries. Derived functions were quite complicated. However, we succeeded to express the overvoltage relaxation after current interruption. For the overvoltage relaxation, we succeeded to obtain the accurate response within 1 mV residuals for 10 minutes relaxation by simply connecting two dual transmission line in series.