Detecting device and detecting method for evenness of fuel cell bipolar plate

Abstract

A detecting device and a detecting method for evenness of a fuel cell bipolar plate are provided. The detecting device comprises a control platform, a press and a tested assembly comprising an upper end plate, a lower end plate, a tested bipolar plate and a membrane electrode polar assembly (MEA). The detecting device is characterized by further comprising a carbon paper false electrode formed by clamping white stick paper through carbon paper. The white stick paper and the positions of the four corners of the MEA are all provided with carbon paper false electrode location holes corresponding to location holes arranged on the tested bipolar plate. The detecting method is that the upper end plate and the lower end plate clamp the tested bipolar plate, the MEA and the carbon paper false electrode and are arranged between an upper mold and a lower mold of the press, and pressurizing and pressure maintaining are performed on the tested assembly according to practical assembly force of galvanic pile. The white stick paper is taken out after pressure is removed, a user can observe prints on the white stick paper and determine the evenness of the bipolar plate according to the length and definition of the prints. The detecting device and detecting method for the evenness of the fuel cell bipolar plate can truly reflect the evenness of the bipolar plate under the practical assembly force of the galvanic pile so that the test result is true and effective.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a detection device and a detection method for the flatness of a bipolar plate of a fuel cell. Background technique [0002] Bipolar plate flatness refers to the distance from the highest point to the lowest point on its surface. Bipolar plates, especially all-metal bipolar plates, are often deformed due to uneven structure of raw materials and uneven stress distribution during deformation when forming bipolar plates. If the warpage of the bipolar plate exceeds a certain range, it will greatly affect the distribution of the assembly force of the stack, resulting in a large force on the convex part and a small or no force on the concave part. In severe cases, it may even cause the membrane electrode to "three". In one "assembly (membrane-electrode-assembly, hereinafter referred to as MEA) breakdown so that the entire electric stack burned. Therefore, the flatness of bipolar pl...

AI Technical Summary

Problems solved by technology

But its disadvantages are: it can only detect the flatness of the ridge plane in a limited number of parts, and cannot reflect the flatness of the entire bipolar plate; Flatness under actual assembly force

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