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Bipolar plate for fuel cells, and production method

A fuel cell and bipolar plate technology, which is applied to fuel cell components, fuel cells, electrochemical generators, etc.

Pending Publication Date: 2019-10-08
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the sensitivity of the membrane, increasing the applied pressure is limited by the requirement not to compress the GDL too much to ensure adequate gas diffusion, as well as the mechanical stability of the BiP

Method used

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  • Bipolar plate for fuel cells, and production method
  • Bipolar plate for fuel cells, and production method
  • Bipolar plate for fuel cells, and production method

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Embodiment Construction

[0014] In a further alternative of the invention (which may be present alone or in addition), the metal substrate has, on the surface in contact contact with the gas-permeable element in the electrochemical cell, a raised portion in the corresponding surface and / or Or a structural pattern composed of depressions.

[0015] The substrate may advantageously have a specific surface area and / or roughness increased by at least 10% relative to the flat rolled surface.

[0016] Advantageously, there is an adhesion-promoting and corrosion-reducing chromium or titanium layer or a chromium- and / or titanium-rich edge zone (2 nm to 200 nm in thickness) formed on the surface of the substrate as a carbon-based layer, layer system or The interlayer below the boundary layer.

[0017] The carbon-based or carbon-rich layer may be formed on a chromium- and / or nickel-rich edge layer on the surface of a substrate, which preferably consists of stainless steel.

[0018] Another option is a transiti...

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Abstract

The bipolar plate according to the invention for electrochemical cells, in particular for proton-exchange membrane (PEM) fuel cells, is made with a metal substrate, and the surface is made of a carbon-based layer, which reduces the electric contact resistance, and a layer system or a boundary layer which is made of a mainly sp2-bound carbon-based layer with a carbon content ranging from 50% to 100% near the surface, said layer being applied onto a metal substrate surface which is modified compared to the starting material. A surface region of the substrate can also be provided as an edge layerwhich is made with nitride and / or carbon by a nitriding and / or carbonizing process. The surface of the metal substrate, said surface being in contact with a gas-permeable element within the electrochemical cell, can have a structuring which is made with elevations and / or depressions in the respective surface.

Description

technical field [0001] The present invention relates to bipolar plates for electrochemical cells, especially for polymer electrolyte fuel cells or proton exchange membrane (PEM) fuel cells, and methods of manufacture. Fuel cells are used to obtain electrical energy from fuel and oxidant through electrochemical reactions. Proton exchange membrane (PEM) fuel cells (PEMFCs) are especially suitable in the context of mobile applications (eg in vehicles). However, another possibility exists to operate electrochemical cells by using electrical energy to initiate electrochemical reactions in which hydrogen is available as a reaction product. Background technique [0002] In the following the term "fuel cell" is used generically, however, of course this term should also be understood to include other electrochemical cells. [0003] Bipolar plates (BiP) are used in fuel cells for the supply of hydrogen and oxygen and for the removal of water / cooling water and also to extract (Abgrei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0206H01M8/021H01M8/0247H01M8/1018H01M8/0228
CPCH01M8/0206H01M8/021H01M8/0228H01M8/0247H01M2008/1095Y02P70/50Y02E60/50
Inventor 斯拉夫乔·托巴尔斯基特加·罗氏托马斯·斯图基阿克塞尔·兹威克乔治·毛里齐奥
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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