Patent ID: 6653818
Filing Date: 2003-11-25
Classification: G01R

Abstract:
A method for predicting an equilibrated open-circuit voltage of an electrochemical storage battery comprising measuring a voltage settling response Uo(t) in a load-free period using a relationship (1) between an equilibrated open-circuit voltage Uoo and a decaying voltage Uo(t)Uoo=Uo(t)âˆ’w*ln(t)âˆ’w*F(T)â€ƒâ€ƒ(1), wherein w is an experimentally determined slope of dependency of Uo on ln(t) at time t, w=âˆ’(Uo(t2)âˆ’Uo(t1))/ln(t2/t1), Uo(t1) is an unloaded voltage Uo at time t1, Uo(t2) is an unloaded voltage Uo at later time t2>t1, and F(T) is a function which depends only on absolute temperature T of the battery.