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Etude expérimentale et modélisation d'une micropile à combustible à respiration

Abstract : The micro breathing fuel cell is developed by STMicroelectronics Tours and the CEA Liten of Grenoble. It is very low power (1W stack) and will eventually be used in a portable charging system for small Li-Ion batteries (cell phones). The structure of these micro fuel cells is such that they are very sensitive, among other things, to weather conditions characterizing their environment. This sensitivity results in a very complex electrical behavior. But the portable aspect of the application implies that it will have to cope with various atmospheres. It is therefore necessary to understand the interactions linking the electrical behavior of the micro fuel cell and the atmosphere. A model may then provide some concrete leads in terms of auxiliary control (micro fans ...) and packaging design, to control the immediate environment of the microcell in the best possible way. To this end, a lot of measure were carried out under controlled atmosphere, and in several electrical operating modes, and were crossed with each other. They let us build the assumptions for a macroscopic steady state model of micro fuel cell, linking atmospheric and operating conditions to the electrical response of the micro fuel cell. This model was inspired by the theory of diffusion in porous media. This steady state model, involving a description of a cathodic protonic diffusion, is used to represent the behavior of the micro fuel cell on a wide range of atmospheric conditions, and physically illustrates both drying out situations than drowning. The approach was then extended to develop a small signal model, configured with a multi spectral and multi-operating conditions approach. It allows among other things to quantify the dynamics associated with the phenomenon of proton diffusion, while consolidating its steady state description, this involving parameters consistent with those of the steady state model. Finally, at the intersection of the steady state and small signal approaches, the bases for a large signal dynamic model are proposed. They involve the large signal model which is specific to the LAPLACE, by injecting in it the dynamic response to environmental stress and to water balance. This model, with parameters set from the steady state and small signal models, turns out to be able to represent the nonlinear behavior of the micro fuel cell over a wide range of frequencies of the galvanostatic strong signal solicitation.
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https://tel.archives-ouvertes.fr/tel-00733474
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Submitted on : Tuesday, September 18, 2012 - 4:57:26 PM
Last modification on : Monday, October 19, 2020 - 11:11:48 AM

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  • HAL Id : tel-00733474, version 1

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Marwan Zeidan. Etude expérimentale et modélisation d'une micropile à combustible à respiration. Energie électrique. Institut National Polytechnique de Toulouse - INPT, 2011. Français. ⟨tel-00733474⟩

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