The Research of Methods to Determine the State of Charge of Nimh Batteries

In this article, the dependence of various diagnostic parameters on the degree of charge of Nickel-metal hydride batteries is studied. The first parameter was the characteristic frequency – the frequency of the measuring signal, at which the value of the reactance becomes zero. The other two parameters were the angular coefficient of inclination k and the coefficient of displacement b of the linear equation, which can be approximated by the frequency dependence of the reactance. The study showed that only the characteristic frequency and displacement coefficient are dependent on the degree of charge and can potentially be used in battery monitoring and diagnostics systems.