Flow field assembly for fuel cell and fuel cell

By designing sealing components and bypass channel structures on the flow field plate, the problem of uneven distribution of reaction fluid in the fuel cell unit was solved, the current density and proton conduction capacity were improved, the fuel cell was ensured to operate efficiently and reliably, and the manufacturing difficulty and cost were reduced.

CN223842889UActive Publication Date: 2026-01-27ROBERT BOSCH GMBH
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Patent Information

Application Number
CN202520328836.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-26
Publication Date
2026-01-27
Estimated Expiration
2035-02-26

AI Technical Summary

Technical Problem

The flow field plate of a traditional fuel cell unit causes uneven distribution of the reaction fluid, resulting in uneven current density, which reduces fuel cell efficiency. Furthermore, the proton exchange membrane is excessively dried near the inlet port, reducing proton conductivity and increasing high-frequency impedance.

Method used

Design a flow field assembly including a flow field plate and a sealing member. The flow field plate is provided with an inlet port, an outlet port and a flow field. The sealing member defines a bypass channel for partially diverting the reaction fluid to a selected area of ​​the reaction zone, thereby improving the uniformity of fluid distribution. The bypass channel structure provided by the sealing member also prevents the proton exchange membrane from being over-dried.

Benefits of technology

This improves the uniformity of the reaction fluid distribution in the reaction zone, enhances the uniformity of current density and proton conduction capability of the fuel cell unit, ensures reliable and efficient operation of the fuel cell, and reduces manufacturing difficulty and cost.

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Abstract

A flow field assembly for a fuel cell includes a flow field plate and a sealing member. A sealing member is disposed on the first side of the flow field plate and defines at least one bypass channel. The at least one bypass channel is configured to partially divert the reaction fluid from the inlet port of the flow field plate into a selected region of the reaction zone to cause the diverted portion of the reaction fluid to mix with the undiverted portion of the reaction fluid in the selected region such that the diverted portion of the reaction fluid is less than the undiverted portion of the reaction fluid in the selected region than in the absence of the at least one bypass channel. And the distribution uniformity of the reaction fluid on the reaction area is improved. The utility model also provides a fuel cell unit comprising the flow field assembly. According to the flow field assembly provided by the invention, the distribution uniformity of the current density can be improved by improving the distribution uniformity of the reaction fluid on the reaction region, so that reliable and efficient operation of the fuel cell unit is ensured.
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