Fuel Cell Metal Separator Bead Seal Bypass Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing fuel cell metal separators suffer from reduced coolant flow rate and cooling efficiency due to coolant bypassing through channels on the back of bead seals, which hampers effective heat management in fuel cell systems.
Innovation Solution
A fuel cell metal separator design featuring a reactant gas flow field with a ridge-shaped bead seal on one surface and a coolant flow field on the other, with an in-bead channel connecting coolant supply and discharge passages, and a narrowed segment within the channel to reduce bypass flow, utilizing filler material to further restrict the channel area, thereby enhancing coolant flow through the coolant flow field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a ridge shaped bead seal is formed in a metal separator by press forming, then production cost is reduced, but a channel is formed on the back of the bead seal causing coolant to bypass from the coolant supply passage to the coolant discharge passage
Solution Approach 1:
The harmful channel formed on the back of the bead seal is extracted and eliminated by optimizing the bead seal formation process. The invention forms the bead seal such that no channel is created on its back surface, preventing coolant bypass while maintaining the press forming manufacturing method's cost advantages.
Solution Approach 2:
The bead seal structure is modified locally to prevent channel formation. By controlling the bead seal's geometric properties and formation parameters in the press forming process, the local quality of the seal structure is improved to eliminate the harmful channel effect.
2Device complexity
If coolant flows through the channel on the back of the bead seal, then the channel connects coolant supply and discharge passages, but the flow rate of coolant through the coolant flow field is reduced and cooling efficiency is lowered
Solution Approach 1:
The invention converts the potential harm of the bead seal back channel into a benefit by optimizing its structure. The bead seal is designed to provide sealing function while its back surface is configured to prevent channel formation, thus eliminating coolant bypass and improving cooling efficiency.
Data Source
AI summary
An oxygen-containing gas flow field and an inner bead (or a bead seal) are formed on one surface of a first metal separator, and a coolant flow field as a passage of a coolant is formed on the other surface of the first metal separator. Further, a coolant supply passage and a coolant discharge passage extend through the first metal separator in a separator thickness direction. An in-bead channel as a passage of the coolant is formed by a recess on the back side of the inner bead. A narrowed segment is provided in a part of the in-bead channel. The channel cross sectional area of the narrowed segment is smaller than those of other segments.