Study of thickness distribution and dimensional accuracy of stamped metallic bipolar plates

Barzegari, Mohammad Mahdi; Khatir, Farzad Ahmadi

doi:10.1016/j.ijhydene.2019.09.225

Cited by 51 publications

(10 citation statements)

References 34 publications

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“…8a) indicate a gradual decrease in channel forming depth from border region to central area. For a single channel, the forming depth in the middle is greater than at the two ends, consistent with trends observed in previous research [10,11]. Across the entire measurement region of the specimen (distance in the channel width direction from channel 1 to 10 is 12mm, channel length is 105mm, with a total of 8 periods), the maximum observed difference in channel forming depth reaches 60μm.…”

Section: Channel Depth Consistency Improvement Of Partitioned Multi-s...supporting

confidence: 90%

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Forming of large scale bipolar plates for high power fuel cell stacks

Ma,

Zhang,

Guo

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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Developing high-power (e.g. megawatt-scale) single fuel cell stacks is of significance to extending the application of hydrogen fuel cells in high-energy-consumption fields such as aerospace, maritime, and rail transportation. Bipolar plate is one of the core components of hydrogen fuel cell stacks. Currently, the mainstream hydrogen fuel cell stacks achieve a maximum power of about 200 kW with a bipolar plate area of approximately 600 cm2. While the megawatt-scale hydrogen fuel cell stacks requires large scale bipolar plates with an area of e.g. >2000 cm2 and higher geometric complexity of flow channel. However, the structural design and manufacturing process for such large scale bipolar plates remain unexplored. Based on the concept of “partitioned modular manufacturing”, the large scale bipolar plate is divided into multiple smaller scale bipolar plate modules in this work, and then integrated into a single component, which is then formed by applying multi-step stamping process to each module. Therefore, a so-called “partitioned multi-step stamping process” is proposed to form large scale bipolar plates with fine flow channels. Experimental validation was conducted using 0.1 mm thick titanium sheets and austenitic stainless steel sheets, demonstrating a prospective solution to manufacture large scale bipolar plates for high power hydrogen fuel cell stacks.

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Section: Channel Depth Consistency Improvement Of Partitioned Multi-s...supporting

confidence: 90%

“…Consequently, this variation can adversely impact the efficiency of power generation in the fuel cell. [10][11][12][13]. (3) Tools suitable for manufacturing large-scale bipolar plates are expensive, and their processing is more challenging.…”

Section: Introductionmentioning

confidence: 99%

Forming of large scale bipolar plates for high power fuel cell stacks

Ma,

Zhang,

Guo

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The prevalence of low-angle grain boundaries in the range of 0° to 5° before stamping for both states of AISI 441 steel is typical of a dislocation substructure exhibiting a low density of dislocation lines compared to the predominance of high-angle grain boundaries in the range of 15° to 62.5°, as detected after stamping [14,19].…”

Section: Texturementioning

confidence: 86%

Study of the stampability of AISI 441 steel under different initial conditions

Neto,

Silva,

Matějka

et al. 2024

Preprint

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The deep drawing process in metallic materials has several limitations, such as a stamped depth, the occurrence of wrinkles, the fracture of the sheet before total deformation and the generations of solids with variations in wall thickness. Considering these variables, this work studies the formability of AISI 441 stainless steel under different initial conditions, namely, as-received and rolled to investigate the effect of these variables on the formability of this ferritic stainless steel. The mechanical characterization of AISI 441 steel involved tensile, shearing and Vickers microhardness tests followed by cold stamping, using a deep stamping die. The structural investigation was accomplished by optical microscopy and electron backscatter diffraction techniques. The mechanical behaviour after the stamping process was analyzed by shearing tests on the bottom and wall of the cup and correlated to the deformation limit of the material, and the respective texture characteristics. The shearing test results indicated the effect of the initial condition on the mechanical behaviour after the stamping of AISI 441 steel, which exhibited hardening of the wall and softening at the bottom of the cups. Change in misorientation grain and strengthening of γ-fiber texture component for the rolled condition of AISI 441 steel.

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“…Barzegari et al [36] studied the thickness distribution and dimensional accuracy of stamped metal bipolar plates. They found that the forming pressure could be optimized to improve the forming accuracy of SS316L bipolar plates.Chen et al [37] while studying the preparation of proton exchange membrane fuel cell microchannel arrays on thin stainless steel plates by microstamping technique, found that the depth of the flow channels on the prepared metal pole plates was usually shallow and it is difficult to process metal bipolar plates with high aspect ratio and fine-grained microfabrication structure.…”

Section: Single Press Formingmentioning

confidence: 99%

A Study on the Current status of Metal Bipolar Plate Materials and Stamping and Forming for Fuel Cells

Guo

Cunwu²,

Jiahao³

et al. 2022

JERR

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Bipolar plates are one of the most important components in fuel cell stacks and have multiple functions. Compared with composite materials, bipolar plates of metallic materials have superior electrical and thermal conductivity, good mechanical strength, high chemical stability, very wide choice of alloys, and coating techniques are employed to improve their corrosion resistance and reduce their bottom contact resistance. This paper investigates the selection of materials and stamping and forming of metal bipolar plates in the hope that this research can promote the development of metal bipolar plates for fuel cells. On this basis, we expect to innovate the material and fabrication process of metal bipolar plates, reduce their cost, and promote their commercialization.

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Study of thickness distribution and dimensional accuracy of stamped metallic bipolar plates

Cited by 51 publications

References 34 publications

Forming of large scale bipolar plates for high power fuel cell stacks

Forming of large scale bipolar plates for high power fuel cell stacks

Study of the stampability of AISI 441 steel under different initial conditions

A Study on the Current status of Metal Bipolar Plate Materials and Stamping and Forming for Fuel Cells

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