Method for monitoring a li-ion battery and monitoring device for the implementation of this method

Patent metadata

Field	Value
Publication number	US-2016245875-A1
Application number	US-201415026087-A
Country	US
Kind code	A1
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

Method for determining the state of health of a battery, using a sensor of the acoustic activity of the battery, comprising the following steps:
detection of at least one acoustic event by the sensor; determination of the value of at least one parameter for each acoustic signal detected in the course of the elementary cycle of use; calculation, for the elementary cycle of use, of a value of acoustic density according to a density calculation function taking into account said at least one parameter determined for each of the acoustic signals detected in the course of the cycle; calculation of a state of health value corresponding to said previously calculated acoustic density value, on the basis of a functional relation or a predetermined database, making it possible to know the state of health for a given acoustic density value.

First claim

1 . Method for determining a state of health of a battery, using a sensor of an acoustic activity of the battery, comprising:
detecting at least one acoustic event by the sensor in a course of an elementary cycle of use of the battery, corresponding to a period of use of the battery with at least one of (i) charging operation and (ii) discharging operation; determining the value of at least one parameter for each acoustic signal detected in the course of the elementary cycle of use; calculating, for the elementary cycle of use, a value of acoustic density according to a density calculation function taking into account said at least one parameter determined for each acoustic signal detected in the course of the elementary cycle, the density calculation function being a monotonic function based on a number of acoustic events detected during the elementary cycle; calculating a state of health value corresponding to said previously calculated acoustic density value, on a basis of a functional relation or a predetermined database, making it possible to know the state of health for a given acoustic density value.

2 . Method for characterizing a test battery, using a sensor of an acoustic activity of the test battery, comprising performing a plurality of successive test operations during successive elementary cycles of use of the test battery, each test operation comprising:
detecting at least one acoustic event by the sensor in a course of an elementary cycle of use of the test battery, corresponding to a period of use of the test battery with at least one of (i) charging operation and (ii) discharging operation; determining a value of at least one parameter for each acoustic signal detected in the course of the elementary cycle of use; determining, for the elementary cycle of use, a value of acoustic density according to a density calculation function taking into account said at least one parameter determined for each acoustic signal detected in the course of the elementary cycle, the density calculation function being a monotonic function based on a number of acoustic events detected during the elementary cycle; determining, in the course of the elementary cycle or at an end thereof, a state of health of the test battery; storing in a database the state of health and the acoustic density value determined previously for the elementary cycle concerned.

3 . Method for characterizing a test battery according to claim 2 , further comprising determining a functional relation which makes it possible to know the state of health of the test battery for a given acoustic density value, based on said database.

4 . Method for determining the state of health of a battery according to claim 1 , wherein the state of health value corresponding to the acoustic density value is calculated on the basis of a predefined database.

5 . Method for determining the state of health of a battery according to claim 1 , the state of health value corresponding to an acoustic density value is calculated on the basis of a predefined functional relation.

6 . Method according to claim 1 , wherein said at least one parameter corresponds to the detection of the at least one acoustic event and the acoustic density value defined for the elementary cycle corresponds to the number of events detected during the elementary cycle.

7 . Method according to claim 1 , comprising, following the determining of the acoustic density value for the current elementary cycle, calculating a smoothed acoustic density value corresponding to a mean of a plurality of most recent acoustic density values, wherein the smoothed acoustic density value is at least one of (i) stored in the database and (ii) used for the state of health calculation.

8 . Method according to claim 1 , wherein said at least one parameter of the acoustic signal is chosen from the following list:
amplitude of the acoustic signal; energy of the acoustic signal; rise time of the acoustic signal; frequency of oscillations of the acoustic signal; duration of the acoustic signal; number of hits in the acoustic signal, a hit corresponding to a passage beyond a threshold; frequency of acoustic hits, the frequency being a number of acoustic hits per unit of time in the acoustic signal; presence of an acoustic event.

9 . Method according to claim 8 , wherein the acoustic density value corresponds to a sum of the values of said at least one parameter of the acoustic signal.

10 . Method for determining the state of health of a battery according to claim 4 , wherein the predefined database is determined by performing a plurality of successive test operations during successive elementary cycles of use of the test battery, each test operation comprising:
detecting at least one acoustic event by the sensor in a course of an elementary cycle of use of the test battery, corresponding to a period of use of the test battery with at least one of (i) charging operation and (ii) discharging operation; determining a value of at least one parameter for each acoustic signal detected in the course of the elementary cycle of use; determining, for the elementary cycle of use, a value of acoustic density according to a density calculation function taking into account said at least one parameter determined for each acoustic signal detected in the course of the elementary cycle, the density calculation function being a monotonic function based on a number of events detected during the elementary cycle; determining, in the course of the elementary cycle or at an end thereof, a state of health of the test battery; storing in a database the state of health and the acoustic density value determined previously for the elementary cycle concerned.

11 . Method for determining the state of health of a battery according to claim 5 , wherein the predefined functional relation is determined by performing a plurality of successive test operations during successive elementary cycles of use of the test battery, each test operation comprising:
detecting at least one acoustic event by the sensor in a course of an elementary cycle of use of the test battery, corresponding to a period of use of the test battery with at least one of (i) charging operation and (ii) discharging operation; determining a value of at least one parameter for each acoustic signal detected in the course of the elementary cycle of use; determining, for the elementary cycle of use, a value of acoustic density according to a density calculation function taking into account said at least one parameter determined for each acoustic signal detected in the course of the elementary cycle, the density calculation function being a monotonic function based on a number of events detected during the elementary cycle; determining, in the course of the elementary cycle or at an end thereof, a state of health of the test battery; storing in a database the state of health and the acoustic density value determined previously for the elementary cycle concerned; and determining the functional relation which makes it possible to know the state of health of the test battery for a given acoustic density value, based on said database.

12 . Method according to claim 2 , wherein said at least one parameter corresponds to the detection of the at least one acoustic event and the acoustic density value defined for the elementary cycle corresponds to the number of events detected during the elementary cycle.

13 . Method according to claim 2 , comprising, following the determining of the acoustic density value for the current elementary cycle, calculating a smoothed acoustic density value corresponding to a mean of a p

Assignees

• Commissariat Energie Atomique
• Univ Grenoble Alpes
• Inst Polytechnique Grenoble

Inventors

• Kircheva Nina
• Thivel Pierre-Xavier
• Genies Sylvie
• Alias Mélanie
• Hing Sothun Eric

Classifications

• G01R31/367 Primary

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G01R31/392 Primary

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

• G01R31/3651 Primary

  Physics · mapped topic

• G01R31/3679

  Physics · mapped topic