Surface treatment method for fuel cell bipolar plate, bipolar plate, and fuel cell

By performing diffusion gas heat treatment on the bipolar plates of fuel cells to form a multi-layer diffusion reaction layer, the problem of sulfate ion corrosion is solved, corrosion resistance and conductivity are improved, coating uniformity is improved, and the service life of the bipolar plates is extended.

CN117385313BActive Publication Date: 2026-07-10CHINA AUTOMOTIVE INNOVATION CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA AUTOMOTIVE INNOVATION CORP
Filing Date
2023-10-12
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing fuel cell bipolar plates suffer from decreased conductivity due to sulfate ion corrosion during use, which affects output efficiency. Furthermore, traditional coating preparation is complex and suffers from severe inhomogeneity issues.

Method used

A diffusion gas is used to thermally diffuse the bipolar plate under vacuum conditions to form a multi-layer diffusion reaction layer extending from the surface inward, including carbon layers, metal oxides and metal nitrides, etc. By controlling the gas composition and ratio, diffusion reaction layers with different compositions and structures are formed inside the bipolar plate.

Benefits of technology

This improved the corrosion resistance and electrical conductivity of the bipolar plates while maintaining their mechanical properties, solved the problem of coating inhomogeneity, and enhanced the service life and efficiency of the fuel cell.

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Abstract

The application provides a surface treatment method of a fuel cell bipolar plate, comprising the following steps: providing a bipolar plate to be treated, and placing the bipolar plate in a closed chamber; vacuumizing the chamber; filling the chamber with a diffusion gas, wherein the diffusion gas comprises nitrogen, and at least one of unsaturated organic gas and oxygen; heating the bipolar plate to a preset temperature of a gas diffusion reaction, and keeping the preset temperature for a preset time, so as to form a diffusion reaction layer extending inward from the surface of the bipolar plate in the bipolar plate. The application can effectively improve the corrosion resistance of the bipolar plate. The application also provides a bipolar plate treated by the above surface treatment method and a fuel cell comprising the bipolar plate.
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