Application of pressure paper to fuel cells

Abstract

The invention discloses application of pressure paper to fuel cells, and belongs to the technical field of fuel cells. The application of the pressure paper to the fuel cells includes assembling the pressure paper and components of a fuel cell into a fuel cell stack, pressurizing the fuel cell stack under the actual assembly pressure, keeping the pressure for a certain period of time, removing thefuel cell stack, and finally detecting the flatness of the components and / or the uniformity of the stack assembly force distribution by observing the color change depth and the color change coverageon the pressure paper. The invention can truly reflect the flatness of the components and the uniformity of the stack assembly force distribution under the actual assembly force, and the result is more accurate; at the same time, the detection precision of the pressure paper is better than that of the white bar paper, and the depth and range of the color change are clearer; the flatness of the components and the uniformity of the stack assembly force distribution are accurately reflected; and the detection process of the invention is simple and efficient, and the test is flexible.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to the application of pressure paper to fuel cells. Background technique [0002] A fuel cell is a device that converts chemical energy directly into electrical energy. Due to its high efficiency, zero emissions, and low start-up temperature, it is very suitable for transportation, stationary power generation, and portable applications. In recent years, countries all over the world are actively researching the application of fuel cells as a power source in various fields. [0003] Due to the small voltage of a single chip, it cannot meet the needs of the power load. Usually, several single cells need to be assembled in series to form a stack. Among them, the flatness of key components has an important impact on the assembly of the stack. These key components include polar plates, tail plates, membrane electrodes, copper electrodes, etc. In addition, the uniformity of the stack ...

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Problems solved by technology

[0007] The patent with the publication number CN101046369A proposes to use the principle of contact resistance to detect the flatness of the polar plate, that is, to evaluate the flatness by detecting the difference in contact resistance on the surface of the polar plate, but due to the limited detection parts, it cannot accurately reflect the entire polar plate flatness, and because the assembly pressure is small, it cannot truly reflect the flatness under the actual assembly force of the stack

[0008] The patent with the notification number CN202361941U proposes to use a carbon paper dummy electrode (composed of two carbon paper and a white stick paper) method to detect the flatness of the plate, that is, to apply actual assembly pressure to the stack with the carbon paper dummy electrode added to ensure After pressing for a period of time, disassemble the stack, and check the flatness of the plate by observing the clarity and range of the imprint on the white stick paper. However, due to the need for self-made carbon paper dummy electrodes, it takes longer time and it is difficult to ensure the consistency and flatness of the preparation process. Requirements, which will affect the accuracy of measuring the flatness of the plate afterwards

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