Method for determining a probe signal, method for checking for and detecting a fault in an electrochemical system employing such a signal

Patent metadata

Field	Value
Publication number	US-12416680-B2
Application number	US-202017783234-A
Country	US
Kind code	B2
Filing date	Dec 7, 2020
Priority date	Dec 9, 2019
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A method for determining a probe signal for acoustically interrogating an electrochemical system, the method including transmitting a first signal, called the calibration signal, including a wave train of multiple frequencies, the spectral density associated with each frequency being identical; receiving the response of the electrochemical system to the calibration signal; determining, on the basis of the received response and for each frequency of the calibration signal, a signal attenuation factor; determining, for each attenuation factor, a correction factor according to the attenuation factor so as to associate a correction factor with each frequency of the calibration signal; and determining the probe signal, the probe signal being obtained by multiplying the spectral density associated with each frequency of the calibration signal by the correction factor corresponding to the frequency in question.

First claim

The invention claimed is:

1. A method for detecting a fault of an electrochemical system, said method comprising:
at a first instant:
transmitting a first signal, which is a calibration signal, comprising a wave train of multiple frequencies, a spectral density associated with each frequency being identical, in such a way as to induce a response of the electrochemical system;
receiving the response of the electrochemical system to the calibration signal;
determining, on the basis of the received response and for each frequency of the calibration signal, a signal attenuation factor;
determining, for each attenuation factor, a correction factor according to said attenuation factor so as to associate a correction factor with each frequency of the calibration signal;
determining a probe signal, said probe signal being obtained by multiplying the spectral density associated with each frequency of the calibration signal by the correction factor corresponding to the frequency;
transmitting the probe signal determined hereinabove to the electrochemical system;
receiving a response of the electrochemical system to said probe signal; and
analysing the response to the probe signal in such a way as to detect a fault of the electrochemical system; and

at a second instant:
determining a new probe signal by implementing again transmitting the calibration signal, receiving of a response of the electrochemical system to the calibration signal, determining for each frequency of the calibration signal a signal attenuation factor, determining for each attenuation factor a correction factor, and determining the probe signal, the correction factors being memorised; and
analysing a change in the correction factors in such a way as to detect a fault or an indicator of ageing of the electrochemical system, based on a difference between the correction factors determined at the first instant and the correction factors determined at the second instant.

2. The method according to claim 1 , wherein, during the determining a probe signal, the probe signal is determined while the electrochemical system is in a reference state.

3. The method according to claim 2 , wherein the transmitting the probe signal, the receiving the response of the electrochemical system and the analysing the response are implemented each time that the electrochemical system is in the reference state used for determining the probe signal.

4. The method according to claim 1 , wherein analysing the response comprises:
a sub-step of determining the spectral density of the response to the probe signal;
a sub-step of memorising the spectral density of the response to the probe signal;
a sub-step of comparing the determined spectral density with a statistic of responses, said statistic of responses being determined from spectral densities memorised during preceding implementations of the sub-step of memorising the spectral density of the response to the probe signal; and
a sub-step of detecting a fault of the electrochemical system when a difference between the spectral density determined during the sub-step of determining and the statistic of the responses is greater than a predetermined value.

5. The method according to claim 1 , wherein the spectral density associated with each frequency in the calibration signal is chosen in such a way as to induce a linear response of the electrochemical system.

6. The method according to claim 1 , wherein a duration of the probe signal is sufficiently long to establish a stationary regime in the response of the electrochemical system to the probe signal.

7. The method according to claim 1 , wherein frequencies associated with an attenuation factor, which is greater than a predetermined threshold, are not taken into account in the determining of the probe signal.

8. The method according to claim 1 , wherein the calibration signal is transmitted while the electrochemical system is in a reference state.

9. A method for checking a conformity of an electrochemical system to be checked with respect to a reference electrochemical system comprising:
determining a probe signal using a method according to claim 1 implemented on the reference electrochemical system;

for each calibration electrochemical system of a plurality of calibration electrochemical systems:
transmitting the probe signal determined hereinabove to the calibration electrochemical system;
receiving a response of the calibration electrochemical system to said probe signal; and
calculating statistics regarding responses of the calibration electrochemical systems being thus obtained;

the method also comprising:
transmitting the probe signal to an electrochemical system to be checked;
receiving a response of the electrochemical system to be checked after the probe signal is transmitted; and
comparing the response of the electrochemical system to be checked with the statistic of responses of the calibration electrochemical systems in such a way as to detect a fault of the electrochemical system to be checked.

10. The method according to claim 9 , wherein the probe signal is redetermined at a regular interval or on demand from a user.

11. A device for determining a probe signal, for checking a conformity of an electrochemical system or for detecting a fault of an electrochemical system, comprising a computer configured to implement a method according to claim 1 .

12. A non-transitory computer-readable storage medium on which is recorded a computer program comprising machine executable instructions to implement the method according to claim 1 .

Assignees

• Commissariat Energie Atomique

Inventors

• Guillet Nicolas
• Gau Vincent

Classifications

• G01R31/382 Primary

  Arrangements for monitoring battery or accumulator variables, e.g. SoC · CPC title

• G01R31/392 Primary

  Determining battery ageing or deterioration, e.g. state of health · CPC title