The high quality and the relevance of Kamil’s thesis contributed to get significant results as a part of Fuchya project.
“Diagnosis of mechanical tightening of a single polymer electrolyte membrane fuel cell (LT-PEM and HT-PEM) in aeronautical applications”
About this thesis
Results reported in the literature indicate that the quality of the mechanical tightening of a FC assembly might be assessed through its ohmic resistance (Rohm), more precisely through its electronic part (Re-, formed by the bulk resistances of FC layers and the interfacial contact resistances). In nominal operating conditions, the second and more dominant part of Rohm – the protonic resistance (RH+, formed by the membrane and ionomer resistances) – does not depend on clamping pressure. This amalgamation of resistances of different natures prevents an easy extraction of Re- without the use of invasive sensors and thus an estimation of the quality of the mechanical tightening of a FC assembly.
This thesis proposes an in situ preventive diagnosis method that is capable of detecting the degradation of clamping conditions of a FC through the modelling of its ohmic resistance. A theoretical study is performed and demonstrates that the RH+ and Re- resistances can be separated from the total Rohm, based on their temperature dependence. The proposed method is verified with experimental data generated during the characterization of low and high temperature Polymer Electrolyte Membrane (PEM) single cells. Although some differences between the values identified by the algorithm and those reported in the literature are observed, they correctly depict the behavior of the mechanical tightening of the tested FCs. Overall, the results are encouraging in the aim of monitoring the quality of mechanical tightening of a FC through the evolution of RH+ and Re-.
|Melika HINAJE||Rapporter||Professor at GREEN, Université de Lorraine|
|Denis CANDUSSO||Rapporter||Researcher at IFSTTAR/SATIE/FCLab|
|Yann BULTEL||Examiner||Professor at LEPMI, Grenoble INP|
|Catherine CADET||Examiner||Lecturer (HDR) at GIPSA-lab, UGA|
|Julien D’ARBIGNY||Invited||Engineer at Safran Aerotechnics|
|Théophile HORDÉ||Invited||Technical Manager at Safran Power Units|
|Fabio COCCETTI||Invited||Head of Components Modelling and Reliability Competence Centre, IRT Saint Exupéry|
|Christophe TURPIN||Thesis Director||Researcher at LAPLACE, Toulouse INP|
|Antoine PICOT||Thesis Co-Director||Lecturer at LAPLACE, Toulouse INP|
“High-level diagnostic methods of FC operational availability: Assessing the quality of mechanical tightening of single LT-PEM and HT-PEM cells via electrical measurements” K. MROZEWSKI, A. PICOT, O. RALLIERES, C. TURPIN, G. GAGER, J. D’ARBIGNY, T. HORDE, L. PRISSE – Plenary meeting of the Groupement de Recherche “Hydrogène, systèmes et Piles à Combustible” (GdR HySPàC 2017) – Limoges, France
“Determination of Mechanical Tightening of Single LT-PEM and HT-PEM Cells via Electrical Measurements” K. MROZEWSKI, A. PICOT, O. RALLIERES, C. TURPIN, G. GAGER, J. D’ARBIGNY, T. HORDE, L. PRISSE – 12th International Conference on Modelling and Simulation of Electric Machine, Converters and Systems (ELECTRIMACS 2017) – Toulouse, France
The request of the patent was lodged on 14/01/2019 under number FR1900318, with these inventors:
- IRT Saint Exupéry, MROZEWSKI Kamil
- Toulouse INP / LAPLACE, PICOT Antoine
- CNRS / Toulouse INP / LAPLACE, TURPIN Christophe
- Zodiac Aerotechnics, D’ARBIGNY Julien