Arrangement and method for detection and localization of short circuits in membrane electrode arrangements
An arrangement for non-destructive detection and localization of short circuits in a membrane electrode arrangements (MEA), that includes the following components: a) a sample holder for holding and positioning an MEA; b) means for making electrical contact with an MEA so that an electrical voltage can be applied to the MEA; c) means for detection of position-resolved data via the thermal radiation from a body, which means can be arranged at a distance, which can be predetermined, from the sample holder and can make electronic contact with means for evaluation of the detected data. In addition a method for non-destructive detection and localization of short circuits in an MEA.
1 . An arrangement for detection and localization of short circuits in a membrane electrode arrangement (MEA), comprising:
a sample holder configured to hold the MEA in position;
an electrical contact device configured to make electrical contact with the MEA so as to apply electrical voltage to the MEA;
a detector disposed at a predetermined distance from the sample holder and configured to detect a position-resolved data from a thermal radiation of a body; and
a evaluation device disposed in electronic contact with the detector and configured to evaluate the data.
2 . The arrangement as recited in claim 1 , wherein the sample holder includes a scale, and wherein the MEA is positionable in a defined manner with respect to the scale.
3 . The arrangement as recited in claim 2 , wherein the scale is legible in the infrared band of the electromagnetic spectrum.
4 . The arrangement as recited in claim 1 , wherein the electrical contact device includes at least one terminal clampable to the MEA in an electrically conductive manner.
5 . The arrangement as recited in claim 1 , wherein electrical contact device includes at least one magnet fitted to the MEA in an electrically conductive manner.
6 . The arrangement as recited in claim 4 , wherein the electrical contact device includes a contact surface coated with an electrically highly conductive material.
7 . The arrangement as recited in claim 1 , wherein the detector includes a thermal imaging apparatus.
8 . The arrangement as recited in claim 1 , wherein the detector is configured to allow photographically imaging data detection.
9 . The arrangement as recited in claim 1 , wherein the detector is configured to detect time-resolved data.
10 . The arrangement as recited in claim 9 , wherein the detector is configured to provide a frame repetition rate of at least 10 Hz.
11 . The arrangement as recited in claim 1 , wherein the detector is configured to detect the position-resolved data in real time.
12 . A method for detection and localization of short circuits in a membrane electrode arrangement (MEA), the method comprising:
positioning the MEA on a sample holder;
aligning a detector at a predetermined distance from the sample holder, the detector configured to detect position-resolved data from a thermal radiation of a body;
applying an electrical voltage to the MEA;
detecting position-resolved and time-resolved data from the MEA; and
evaluating the detected data.
13 . The method as recited in claim 12 , wherein the detecting is performed separately from at least two areas of an MEA.
14 . The method as recited in claim 13 , further comprising combining the separately detected, position-resolved data before the evaluating.
15 . The method as recited in claim 12 , wherein the evaluating includes determining an area of the MEA having a higher thermal radiation than an average thermal radiation of the MEA to be a hot spot so as to detect the presence of short circuits.
16 . The method as recited in claim 15 , further comprising localizing the hot spot using a scale.
17 . The method as recited in claim 12 , wherein the detecting is performed using photographic imaging.
18 . The method as recited in claim 12 , wherein the detecting of the position-resolved and time-resolved data is performed at a frame repetition rate of at least 10 Hz.
19 . The method as recited in claim 12 , wherein the position-resolved data is detected in real time.
20 . The arrangement as recited in claim 1 , wherein the MEA is part of an electrochemical cell.
21 . The method as recited in claim 12 wherein the MEA is part of an electrochemical cells.
22 . The method as recited in claim 21 , wherein the MEA includes an electrically non-conductive membrane coated on opposite faces with an electrically conductive material.
23 . The method as recited in claim 21 the MEA includes a catalyst-coated membrane (CCM).