Generalized Peukert's Equation for Nickel-Cadmium Batteries at High Discharge Currents

Nataliya N. Yazvinskaya, Don State Technical University, Laboratory of electrochemical and hydrogen energy, 147 Shevchenko Street, Town of Shakhty, Rostov Region, Russia, 346500
2019 International Journal of Electrochemical Science  
In this paper both experimentally and theoretically, the dependence was analyzed of released capacity of nickel-cadmium batteries at diverse discharge currents. It was shown that the classical Peukert's equation is inapplicable at both small and high discharge currents. Meanwhile, the well-known generalized Peukert's equation C=Cm/(1+(i/i0) n ) corresponds well to the experimental data at small and medium discharge currents. However at high discharge currents, the capacity released by
more » ... leased by nickelcadmium batteries is diminished much faster than this generalized Peukert's equation predicts. By experiments and theoretically, it was proved that the reason of the sharper descent of the batteries' released capacity at high discharge currents is the voltage loss escalation on battery internal resistance at a growth of discharge current. There was proposed the equation C=Cm/(1+i n /(i0 n (1-i/i1))) taking into account this effect; and this one corresponds well to the experimental data at any discharge currents.
doi:10.20964/2019.08.50 fatcat:nsmdyrwmlbal7dr2wpgidpfali