Fuel Cell Separator Rib Protrusions to Prevent GDL Sinking

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Solution Overview

Problem

The sections of the gas diffusion layer (GDL) adjacent to the separator in a fuel cell tend to deform and sink into the groove passages, increasing resistance to reactant gas flow and pressure loss.

Innovation Solution

The separator design includes ribs with protrusions that protrude towards the power generating unit, compressing the GDL and frame member to maintain a taut state, preventing sinking into the groove passages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the separator includes groove passages for reactant gas flow, then gas supply function is improved, but the GDL sinks into the groove passages causing increased pressure loss

Engineering Contradiction:

Improvereactant gas supply functionVSAvoidpressure loss of reactant gas

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The protrusions on the rib are designed to compress the GDL and frame member in advance before the cell operates. This preliminary compression action prevents the GDL from sinking into the groove passages during operation, thereby maintaining stable gas flow and reducing pressure loss

Inventive Principle:

Principle #10Preliminary action

2Ease of manufacture

If the separator uses a flat surface design, then manufacturing is simplified, but the GDL cannot be effectively restricted from sinking

Engineering Contradiction:

Improveseparator manufacturing simplicityVSAvoidGDL stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Instead of making the entire separator surface complex, only localized protrusions are added to the rib structure. This maintains the overall simplicity of the separator design and manufacturing process while providing the necessary local compression function to prevent GDL sinking and ensure reliable operation

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The protrusions are designed to perform the compression function in advance during assembly, ensuring the GDL is properly restricted before operation begins. This preliminary action maintains reliability without requiring complex continuous control mechanisms

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration effectively restricts the GDL and frame member from sinking into the groove passages, reducing resistance and maintaining stable gas flow, thereby enhancing the stability and efficiency of the fuel cell.

Implementation Method 1

The power generating unit is compressed by the protrusion in a facing direction in which the power generating unit and the separator face each other

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS12586797B2Separator for fuel cell and single cell for fuel cell

Publication Date: 2026.03.24 TOYOTA BOSHOKU KK

AI summary

A separator for a fuel cell includes a facing surface configured to face a power generating unit of the fuel cell. Groove passages are arranged side by side in the facing surface. Reactant gas flows through the groove passages. Ribs, which are located between the groove passages and protrude toward the power generating unit, are provided on the facing surface. At least one of the ribs includes at least one protrusion that protrudes toward the power generating unit.