Evaluation of Effective Parameters on Stamping of Metallic Bipolar Plates

Khatir, Farzad Ahmadi; Elyasi, Majid; Talebi-Ghadikolaee, Hossein; Hosseinzadeh, Morteza

doi:10.1016/j.proeng.2017.04.047

Cited by 24 publications

(10 citation statements)

References 8 publications

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“…Typical manufacturing methods in the current state of the art are mechanical deep drawing [4][5][6][7][8][9][10][11], hydroforming [4,12] or rubber pad forming [4,[13][14][15]. The basic objective of all manufacturing processes is a precise and accurate forming result of the desired channel cross section profile.…”

Section: Forming and Formability Of Metallic Channel Platesmentioning

confidence: 99%

“…Khatir et al [9] realized experimental forming tests by means of mechanical deep drawing. The main object of the study was the comparison of the forming capacity with and without additional lubricant.…”

Section: Forming and Formability Of Metallic Channel Platesmentioning

confidence: 99%

“…Channel cross section descriptions based on manufacturing and thus tool parameters can be found in the publications [6,7,9]. For example, Khatir et al [9] defined Parameters on the upper and lower dies or the forming punch of the forming tool, resulting in a reshaped channel cross section. Among others, a punch height, a punch flank angle, a punch land width, a punch ground width and an inner and outer radius are set.…”

Section: Investigations Of Channel Cross Sectionsmentioning

confidence: 99%

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Method for Analytical Calculation of the Formability from Metallic Bipolar Plates

Keller

Bauer

Unwerth

et al. 2019

JMMP

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The constructive design of a flow field layout and the channel cross section parameters from a metallic half- or bipolar plate can have a significant influence on the performance characteristics of a fuel cell. One important aspect in the dimensioning of the channel geometry of half plates is the technical forming feasibility. In this article, first an equation is presented, which enables an analytical calculation of the channel parameters. Hereby, continuing calculations with parameter variations will be possible. Furthermore, the formability of the channel geometry of metallic half plates is evaluated through numerical and experimental investigations. Based on the results, an analytical model approach will be derived that enables an appraisal of the formability from channel cross section contours in an early development state. As a final step, the results of the numerical investigations and the analytical calculation method are compared and evaluated with the results of experimental investigations and other publications. It will be shown, that the derived analytical model approach has a good approximation compared to the effects and results from the numerical and experimental analysis. In particular, the assessment of whether a channel cross section can be manufactured safely is a result with high probability of the analytical model approach. Imprecisions happen, especially in variants with extreme geometries, for example, with very small radii or a huge channel depth. For this kind of variations, the analytical model behaves too sensitively, which makes it more difficult to estimate the damage effects. However, at an early development state, the analytical model offers a good method to get a pre-evaluation of the formability of channel cross sections with a simultaneous parameter variation possibility.

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Section: Forming and Formability Of Metallic Channel Platesmentioning

confidence: 99%

Section: Forming and Formability Of Metallic Channel Platesmentioning

confidence: 99%

Section: Investigations Of Channel Cross Sectionsmentioning

confidence: 99%

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Method for Analytical Calculation of the Formability from Metallic Bipolar Plates

Keller

Bauer

Unwerth

et al. 2019

JMMP

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“…These types of bipolar plates have made it possible to manufacture mass production cost-effective plates which make it attractive to the government and private organizations. Metals like stainless steel and aluminum are able to perform properly as normal bipolar plates when machined to 0.1 inches thick and 0.05 inches thick sheets, respectively, if they utilize bipolar plates as a coolant [38]. However, metallic bipolar plate suffers from corrosion and the forming of a thin oxide layer on a plate surface, due to poor chemical stability when exposed to a corrosive environment [36][37][38].…”

Section: Metallic Bipolar Platesmentioning

confidence: 99%

Evaluating the Effect of Metal Bipolar Plate Coating on the Performance of Proton Exchange Membrane Fuel Cells

et al. 2018

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Environmental concerns of greenhouse gases (GHG) effect from fossil commodities and the fast increase in global energy demand have created awareness on the need to replace fossil fuels with other sources of clean energy. PEM fuel cell (PEMFC) is a promising source of energy to replace fossil fuels. The commercialization of the cell depends on its price, weight and mechanical strength. Bipolar plates are among the main components of PEMFC which perform some significant functions in the fuel cell stack. Metal bipolar plate is considered by the research community as the future material for fuel cells. However, surface coating is required for metals to enhance its corrosion resistance, hydrophilicity and interfacial contact resistance (ICR) in PEM fuel cells. Open pore cellular metal foam (OPCMF) materials have been used to replace the conventional flow field channel in recent times due to its low electrical resistance, high specific area and high porosity; however, it endures the same corrosion problem as the metallic bipolar plate. This investigation offers an overview on different types of bipolar plates and techniques in coating metallic bipolar platse and open pore metal foam as flow field channel materials to improve the corrosion resistance which will eventually increase the efficiency of the fuel cell appreciably.

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“…To a certain extent, the material fails and fissures occur [13]. The formability depends on the material and the thickness of the plate [20][21][22][23][24], with the resulting channel shape being characterized by a shape factor that may be incorporated into a flow network model, as reported by Xu et al [25]. It is also possible to combine the geometric shape of the channel cross section with an analytical performance model, as shown by Peng et al [13].…”

Section: Introductionmentioning

confidence: 99%

An Engineering Toolbox for the Evaluation of Metallic Flow Field Plates

et al. 2019

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Metallic flow field plates, also called bipolar plates, are an important component of fuel cell stacks, electrolyzers, hydrogen purification and compression stacks. The manufacturing of these plates by means of stamping or hydroforming is highly suitable for mass production. In this work, a toolbox is created that is suitable for a screening process of different flow field design variants. For this purpose, the geometry and computational mesh are generated in an automated manner. Basic building blocks are combined using the open source software SALOME, and these allow for the construction of a large variant of serpentine-like flow field structures. These geometric variants are evaluated through computational fluid dynamics (CFD) simulations with the open source software OpenFOAM. The overall procedure allows for the screening of more than 100 variants within one week using a standard desktop computer. The performance of the flow fields is evaluated on the basis of two parameters: the overall pressure difference across the plate and the relative difference of the hydrogen concentration at the outlet of the channels. The results of such a screening first provide information about optimum channel geometry and the best choice of the general flow field layout. Such results are important at the beginning of the design process, as the channel geometry has an influence on the selection of the metal for deep drawing or hydroforming processes.

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Evaluation of Effective Parameters on Stamping of Metallic Bipolar Plates

Cited by 24 publications

References 8 publications

Method for Analytical Calculation of the Formability from Metallic Bipolar Plates

Method for Analytical Calculation of the Formability from Metallic Bipolar Plates

Evaluating the Effect of Metal Bipolar Plate Coating on the Performance of Proton Exchange Membrane Fuel Cells

An Engineering Toolbox for the Evaluation of Metallic Flow Field Plates

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