Patent ID: 8907675

Claim:
A method for determining a state of health of an electrochemical device from at least one physicochemical parameter at least partially modeling the physicochemical behavior of said electrochemical device, said method being characterized in that it includes the following steps: applying ( 10 ) to said electrochemical device an input signal comprising a plurality of electrical excitations, each excitation belonging to a particular excitation category chosen from amongst a set formed by a sequence of sinusoidal current or voltage perturbations, around a polarization point of said electrochemical device, each perturbation having a different frequency, so as to travel through a particular series of frequencies; a current or voltage step; and a current or voltage variation going from zero to a nominal value, said input signal comprising at least two excitations of different categories, and measuring an output signal ( 20 ) of said electrochemical device in response to said input signal; then extracting ( 30 ), from said output signal, the response signals associated with each of said electrical excitation signals; then estimating ( 41 ) at least one first parameter from an electrical excitation belonging to a first category and the corresponding response signal; estimating ( 43 ) said at least one physicochemical parameter from an electrical excitation belonging to a category different from the first, of the corresponding response signal and at least the first estimated parameter; estimating ( 50 ) said state of health of the electrochemical device as deviation between the previously estimated value of said at least one physicochemical parameter and a predetermined reference value.