METHOD FOR DETERMINING A STATE OF HEALTH FOR AN ELECTROCHEMICAL DEVICE
First Claim
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1. 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;
thenextracting (30), from said output signal, the response signals associated with each of said electrical excitation signals;
thenestimating (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.
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Abstract
The invention relates to a method for determining a state of health of an electrochemical device in particular having improved reliability. Said method in particular consists of:
- applying (10) to said electrochemical device an input signal comprising electrical excitations of different categories, and measuring an output signal (20) including the response signals to each electrical excitation;
- 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 representative of the physicochemical behavior of the device from an electrical excitation of a different category, of the corresponding response signal and said first estimated parameter;
- estimating (50) said state of health of the electrochemical device as deviation between the previously estimated value of the physicochemical parameter and a reference value.
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Citations
20 Claims
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1. 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:
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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;
thenextracting (30), from said output signal, the response signals associated with each of said electrical excitation signals;
thenestimating (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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for controlling an electrochemical device, characterized in that it includes:
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determining a state of health according to any one of the preceding characteristics;
thenapplying a command to said electrochemical device when said measured deviation exceeds a predetermined threshold deviation.
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Specification