Method for detecting an operating anomaly of a battery and system implementing said method

Patent metadata

Field	Value
Publication number	US-2021057783-A1
Application number	US-201917050247-A
Country	US
Kind code	A1
Filing date	Apr 23, 2019
Priority date	Apr 24, 2018
Publication date	Feb 25, 2021
Grant date	—

Abstract

A method for detecting an anomaly in operating a battery using a battery management system, including an acoustic receiver attached to a battery wall, and a calculating system connected to the acoustic emitter and the acoustic receiver, a mapping defining a first operating region termed the normal operating region, a second operating region termed the at-risk operating region and a third operating region termed the dangerous operating region, the method including at least one first measurement cycle, each being separated from the preceding measurement cycle by a measurement period, each measurement cycle including receiving an acoustic signal by the acoustic receiver, the received signal being transmitted to the calculating system to obtain a measurement point in the mapping; determining the operating region in which the measurement point is located; and when the measurement point is located in the at-risk operating region or in the dangerous operating region, detecting an anomaly.

First claim

1 . A method for detecting an anomaly in the operation of a battery using a battery management system, said system comprising an acoustic emitter configured to be attached to a wall of the battery, an acoustic receiver configured to be attached to a wall of the battery, said acoustic receiver being attached to a wall of the battery during the implementation of the method, and a calculating system connected to the acoustic emitter and to the acoustic receiver, a mapping defining a first operating region corresponding to a normal operating region, a second operating region corresponding to an at risk operating region and a third operating region corresponding to a dangerous operating region, said method comprising at least a first measurement cycle, each measurement cycle being separated from the preceding measurement cycle by a period termed the measurement period, each measurement cycle comprising:
a step of emitting an acoustic signal by the acoustic emitter on instruction from the calculating system; a step of receiving an acoustic signal by the acoustic receiver, the received signal being transmitted to the calculating system so as to obtain a measurement point in the mapping; a step of determining the operating region in which the measurement point is located; when the measurement point is located in the at-risk operating region or in the dangerous operating region, a step of detecting an anomaly.

2 . The method according to claim 1 , wherein the mapping comprises a reference point located in the normal operating region, each region is associated with a speed limit, a speed being positive when the speed is moving away from the reference point and negative when the speed is approaching the reference point, each measurement cycle comprising:
a step of calculating the speed of the measurement point in the mapping, said speed being equal to the distance between the measurement point obtained during the preceding measurement cycle and the current measurement point divided by the measurement period; a step of comparing the speed of the measurement point with the speed limit associated with the operating region in which the measurement point is located; when the speed of the measurement point is greater than the speed limit associated with the operating region in which the second measurement point is located, the triggering of the step of detecting an anomaly.

3 . The method according to claim 1 wherein, each measurement cycle comprises, when an anomaly is detected, a step of triggering an alert.

4 . The method according to claim 1 , wherein each cycle comprises, when an anomaly is detected or an alert is triggered, a step of correcting the operating regime of the battery.

5 . The method according to the preceding claim 1 , comprising, when the step of correcting does not make it possible to re-establish a normal operating regime of the battery after a predetermined period of time, a step of switching to degraded mode or a step of stopping the system.

6 . The method according to claim 3 , wherein a step of reducing the measurement period is triggered by the step of triggering an alert.

7 . The method according to claim 3 , wherein each measurement point obtained during each cycle is stored until a number of measurement points is obtained equal to a threshold value, termed adaptation threshold, the position of the reference point being recalculated then the measurement points erased when said threshold is reached.

8 . A battery management system comprising means for implementing a method according to claim 1 .

9 . A computer program comprising instructions that lead the management system according to the preceding claim to execute the steps of the method according to claim 1 .

10 . A non-transitory computer readable medium readable by a computer including a computer program comprising instructions for performing the method of claim 1 .

Assignees

• Commissariat A Ienergie Atomique Et Aux Energies Alternatives

Inventors

• Guillet Nicolas

Classifications

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• G01N2291/011

  Velocity or travel time · CPC title

• G01N29/07

  by measuring propagation velocity or propagation time of acoustic waves · CPC title

• G01N2291/015

  Attenuation, scattering · CPC title