Stack Press to Support Stack Testing of Fuel Cells and Electrolyzers

by Gräbener Maschinentechnik GmbH & Co. KG

  • Support of the technical stack testing of fuel cells and electrolyzers stacks at the end of their production processes
  • Tailor-made solutions specifically designed for the application
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Stack Press to Support Stack Testing of Fuel Cells and Electrolyzers

  • Tasks of the machine
    • The pre-assembled stack, which consists of a large number of plates, is first moved into the machine and then compressed to a defined height until a certain pressure is reached within the stack.
    • This pressure must then be maintained unchanged for several hours.
    • At this time, the stack is subjected to all the necessary technical tests carried out by the customer and with the help of further procedures.
    • These are necessary to confirm its full operability.
    • As soon as the tests are completed, the stack is finally assembled with tie rods or tension straps and the finished stack is removed.

Key features

  • In order to be able to guarantee assembly work during operation with maximum safety, we avoid hydraulic drives deliberately.
  • Instead, the stack is compressed inside the press by means of servomotor-driven spindle units. These are operated synchronously and thus enable particularly homogeneous compression of the stack.
  • A special feature is the compensation of production-related stacking tolerances. Stacking tolerances are unavoidable, but when the stack is compressed, they cause transverse forces which can damage the stack.
  • In order to eliminate these and to build up an even pressure distribution within the stack, these transverse forces must be continuously compensated for during compression of the stack.
  • This is done with short-stroke cylinders that are located under the spindle lifting elements.

Application areas

  • Production of metal bipolar plates for fuel cell application
  • Production of metal separator plates for electrolysis application
  • Production of metal bipolar plates for heat exchanger application

Contact us

  • Let us help you out in getting the most efficient stack press to support stack testing of fuel cells and electrolyzers.


Stack Press to Support Stack Testing of Fuel Cells and Electrolyzers


Stack Press to Support Stack Testing of Fuel Cells and Electrolyzers

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    Gräbener Maschinentechnik GmbH & Co. KG

    Graebener® Bipolar Plate Technologies is part of Graebener® Maschinentechnik, a medium-sized, family owned machine building company with locations in Netphen (Germany) and Houston (USA) as well as various international representatives. For 20 years, Graebener® has been one of the first companies to focus on the research and development of manufacturing processes and machines for fuel cell and electrolyzer components.

    The company has dedicated itself to setting the quality standard for manufacturing technologies by developing innovative processes and machines that help to manufacture fuel cell and electrolyzer components, such as the metallic bipolar plate, that are tailor-made, integrable, scalable and thus economically efficient.

    For this purpose, Graebener® accompanies all strategically important steps towards the optimally designed production line: Starting from engineering with a view to plate design and line concept via prototyping and small series production in the in-house production laboratory up to the customized production machine or line. Experience from more than 100 years of metal processing and worldwide customer-specific special solutions are incorporated into the holistic development partnership with the customer.

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