US 12,461,157 B2
Anomaly identification in an electrochemical system
Emeric Brun, Avon (FR)
Assigned to ELECTRICITE DE FRANCE, Paris (FR)
Filed by ELECTRICITE DE FRANCE, Paris (FR)
Filed on Nov. 29, 2022, as Appl. No. 18/071,107.
Claims priority of application No. 2112656 (FR), filed on Nov. 29, 2021.
Prior Publication US 2023/0168305 A1, Jun. 1, 2023
Int. Cl. G01R 31/367 (2019.01); G01R 31/392 (2019.01); G01R 31/396 (2019.01)
CPC G01R 31/367 (2019.01) [G01R 31/392 (2019.01); G01R 31/396 (2019.01)] 11 Claims
OG exemplary drawing
 
1. A method for diagnosing an actual electrochemical system, implemented by computer means, said system being composed of a plurality of electrochemical elements electrically connected in series, the method comprising:
a. collecting measurement data from the system at a plurality of instants, said data being timestamped and including, for each instant, at least:
a voltage and a current across the terminals of the system,
a first voltage, across the terminals of a first electrochemical element, corresponding to the highest voltage among the voltages across the terminals of each of the electrochemical elements of the system considered at said instant, said first voltage being associated with an identifier of said first electrochemical element,
a second voltage, across the terminals of a second electrochemical element, corresponding to the lowest voltage among the voltages across the terminals of each of the electrochemical elements of the system considered at said instant, said second voltage being associated with an identifier of said second electrochemical element,
b. deducing, from said measurement data, for each instant:
a reference state of charge of the system,
a first state of charge deviation of the first element relative to the reference state of charge of the system,
a second state of charge deviation of the second element relative to the reference state of charge of the system, so as to obtain, for each instant, a data set associated with a pair of elements of interest formed of the first and second elements,
c. grouping the data sets by ranges of values of the reference state of charge of each data set, so as to retain a representative data set by ranges of values of the reference state of charge,
d. assigning to each data pair composed of the identifier of the electrochemical element and the corresponding state of charge deviation:
no diagnostic function,
or
at least one of the following diagnostic functions:
an identification function for identifying at least one electrochemical element having a difference in residual capacity compared to a rated residual capacity of the electrochemical elements of the system, that is within the range of values of the reference state of charge;
a quantification function for quantifying said difference(s) in residual capacity;
a quantification function for quantifying an imbalance between the chemical elements of the system.