Method for Detection and Localization of Defects in a Fuel Cell within a Fuel Cell Stack

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This patent describes a method for detecting and locating defects in a fuel cell contained within a fuel cell stack by measuring voltage changes along the edges of the bipolar plates. By analyzing the patterns and peaks in the voltage curves, it is possible to not only identify the presence of a non-conductive (de-energized) region in a cell, but also to accurately locate its position. This technique is especially suitable for direct methanol, hydrogen, and potentially high-temperature fuel cells, provided the bipolar plate conductivity is appropriate.

Use CasesContent extracted from patent full text and abstract with AI.

• Early detection and localization of defective regions in commercial fuel cell stacks for automotive applications.
• Monitoring and preventive maintenance of stationary power generation units using fuel cells.
• Quality control during the manufacturing of fuel cell stacks to ensure integrity before shipment.
• Research and development for new types of fuel cells where system degradation monitoring is critical.
• Remote diagnostics in distributed energy systems powered by hydrogen or methanol fuel cells.

BenefitsContent extracted from patent full text and abstract with AI.

• Allows non-invasive monitoring and detection of local defects in fuel cells without disassembling the stack.
• Permits early detection of failures, improving reliability and uptime of fuel cell systems.
• Facilitates targeted maintenance or replacement, reducing operational costs and downtime.
• Improves overall lifetime of the fuel cell stack by mitigating local overloads and secondary damages.
• Can be applied with conventional detection equipment, making integration into existing setups straightforward for certain fuel cell types.

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Patent Abstract

The invention relates to a method for recognizing and locating defects in a fuel cell, wherein the voltage along the edges of a bipolar plate is detected. Advantageously, the presence of a de-energized region can be concluded directly from the course of the voltage curves. In addition, the position of the de-energized region can be concluded and thereby located from the position of the peak maxima that are determined in the voltage curves. The method is particularly suited for fuel cells, or fuel cell stacks comprising direct methanol fuel cells, or fuel cells operated with hydrogen. Provided that the conductivity of the bipolar plates is not too high, the method may also be employed for high-temperature fuel cells.