Tomographic diagnostics of current distributions in a fuel cell stack

Hirschfeld, Julian A.; Lustfeld, H.; Reißel, M.; Steffen, Bernhard

doi:10.1002/er.1634

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…To find out if our scheme can detect these kinds of defects, a more detailed investigation, including the theory of tomography, needs to be done. Certainly, this is beyond the scope of this paper, but is discussed in a different paper [28]. Experiments corroborating the applicability of our scheme are done right now and results will be published as soon as they are available.…”

Section: Resultsmentioning

confidence: 90%

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A novel scheme for precise diagnostics and effective stabilization of currents in a fuel cell stack

Hirschfeld¹,

Lustfeld²,

Reißel³

et al. 2009

Int. J. Energy Res.

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SUMMARYA novel scheme for detecting inhomogeneous internal currents in a fuel cell stack is presented. In this paper the scheme is investigated for the case that the flow field plates consist of graphite. Then plates of high conductivity, e.g. aluminium between the flow field plates together with small slits in these plates have three effects: (a) Whenever a local inhomogeneity of the electric current occurs at a particular cell in the stack, this will induce a surface current close to that cell perpendicular to the averaged current. This current can be detected. (b) The plates of high conductivity completely prevent the inhomogeneities from spreading to neighbouring cells. (c) Even at the particular cell the inhomogeneity is suppressed as far as possible. Thus this scheme leads to much better diagnostic possibilities and at the same time reduces electric instabilities to an extent, where they probably become harmless. This scheme will first be explained for a simple model to clarify the idea. However, very precise three dimensional computations using realistic parameters are presented, corroborating the results of the simple model.

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Section: Resultsmentioning

confidence: 90%

“…It should be mentioned that the situation becomes more complex if the damage is not local but extended or if several local damages occur at the same time. All these cases will be discussed in a another paper [28].…”

Section: A Simple Modelmentioning

confidence: 94%

A novel scheme for precise diagnostics and effective stabilization of currents in a fuel cell stack

Hirschfeld¹,

Lustfeld²,

Reißel³

et al. 2009

Int. J. Energy Res.

Self Cite

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“…These approaches make impossible the study of many of the electrical interaction that can occur between the cells of a same stack. For diagnostic application and stack stabilization purpose, Hirschfeld et al [8] developed a 3D electrical model of PEMFC stack using the Finite Volume Method and whose equations in the MEA are more detailed in Ref. [9].…”

Section: Introductionmentioning

confidence: 99%

A Three Dimensional Electrical Model of PEMFC Stack

Chadebec

Cauffet

et al. 2012

Fuel Cells

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…11 The current density coupling between cells in a stack has been addressed earlier in experimental 12 as well as in computational studies. 7,11,[13][14][15][16][17][18][19] It has been found that high electrical conductivities of bipolar plates 13,18 and small cell sizes 13 reduce the coupling between cells; however, an aggregate measure that can quantify the degree the coupling has not been determined. The aim of this paper is therefore to find such a measure, if it exists, with a view to determining a criterion for when two adjacent cells do not effect each other's local electrical behavior.…”

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confidence: 99%

An Aggregate Measure for the Local Current Density Coupling in Fuel Cell Stacks

Sharma

Birgersson

Vynnycky

2013

J. Electrochem. Soc.

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A poorly operating or perturbed cell in a fuel cell stack can influence the local current density distributions in neighboring cells, which in turn can lead to lower overall performance and lifetime of the stack. In order to quantify the degree of coupling between adjacent cells in a fuel cell stack, steady-state conservation of charge in a bipolar plate between two cells is analyzed, and a dimensionless number is identified. The latter, which provides an aggregate measure comprising the design, operating conditions and material properties of the bipolar plate, is correlated with the current redistribution between cells, and an upper bound is determined. The fidelity of the dimensionless number and its bound are verified with a one-phase non-isothermal proton exchange membrane fuel cell stack model. The number can easily be employed prior to the design of a fuel cell stack in order to minimize coupling of the current density between cells.

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Tomographic diagnostics of current distributions in a fuel cell stack

Cited by 6 publications

References 25 publications

A novel scheme for precise diagnostics and effective stabilization of currents in a fuel cell stack

A novel scheme for precise diagnostics and effective stabilization of currents in a fuel cell stack

A Three Dimensional Electrical Model of PEMFC Stack

An Aggregate Measure for the Local Current Density Coupling in Fuel Cell Stacks

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