Fuel Cell Stack End Sealing With Annular Lip Compression
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Solution Overview
Problem
Existing fuel cell technologies face challenges in maintaining optimal sealing and pressure distribution, leading to issues such as increased electrical contact resistance, mechanical degradation, and leakage risks, particularly at the interfaces involving fluid piping.
Innovation Solution
A fuel cell design that incorporates a distribution plate with a first face for electric current collection and a distribution face for cooling, featuring a first flat joint interposed between the distribution plate and the tightening plate, with an annular lip around the distribution collector to ensure sealing and fluid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple O-rings are arranged on either side of the electric current collector plate for sealing, then sealing capability is improved, but device complexity increases and leakage risk remains high
Solution Approach 1:
The patent combines multiple sealing functions into a single flat seal element positioned between the distribution plate and clamping plate. This single flat seal replaces the traditional multiple O-rings arrangement, simplifying the sealing structure while maintaining effective sealing against fuel cell fluids at the stack ends.
Solution Approach 2:
The flat seal acts as an intermediary element between the distribution plate and clamping plate, creating a reliable sealing interface. The annular lip on the distribution plate pinches the flat seal against the clamping plate, ensuring effective sealing without requiring multiple separate sealing components.
2Stability of the object's composition
If clamping pressure is applied to the stack, then mechanical stability is improved, but electrical contact resistance increases in insufficiently compressed areas
Solution Approach 1:
The patent applies clamping pressure locally at the stack ends through the flat seal and annular lip configuration. This localized pressure application ensures adequate compression of the MEA and electrical contacts at critical interfaces, reducing electrical contact resistance where it matters most while maintaining overall mechanical stability.
Solution Approach 2:
The clamping plates and flat seals are positioned and pre-compressed during assembly to ensure proper contact pressure is applied to the MEA and electrical components before operation begins. This preliminary compression prevents excessive electrical contact resistance during fuel cell operation.
3Stability of the object's composition
If clamping pressure is applied to the stack, then mechanical stability is improved, but mechanical degradation accelerates in overcompressed areas
Solution Approach 1:
The flat seal and annular lip configuration distributes clamping pressure locally at the stack ends rather than applying uniform pressure throughout the entire stack. This localized pressure application provides mechanical stability at critical interfaces while avoiding excessive compression that would accelerate mechanical degradation of the MEA and other components.
Solution Approach 2:
The patent optimizes the clamping pressure parameter by using the flat seal and annular lip to apply pressure only where needed at the stack ends. This controlled pressure application maintains mechanical stability while preventing the excessive compression that leads to accelerated mechanical degradation and reduced lifespan.
4Reliability
If sealing is performed at the interface between clamping plate and electric current collector plate, then leakage risk is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent integrates the sealing function into a single flat seal element that combines multiple sealing surfaces and functions. This unified sealing approach simplifies manufacturing and assembly compared to traditional multi-component sealing systems, while maintaining effective sealing at the critical interface between the clamping plate and distribution plate.
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 ensures effective sealing against fluids, reduces leakage risks, and enhances the mechanical integrity of the fuel cell by maintaining consistent pressure distribution across the stack, thereby improving performance and lifespan.
Implementation Method 1
an annular lip arranged around the distribution collector, so as to pinch the first flat seal to ensure a seal against the fluid
Data Source
Figure 1~2
AI summary
The invention relates to a fuel cell (1) having a stack of a plurality of cells, the stack being sandwiched between a first clamping plate (17, 23) and a second clamping plate (22), the fuel cell (1) having a first flat seal (19) and a distribution plate (11), the distribution plate (11) comprising a first collection face, the first collection face and/or the first clamping plate (17, 23) having an annular lip arranged so as to clamp the first flat seal (19).