Electrochemical Seal Support Structure for Flow Field Edge Stress
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Solution Overview
Problem
Existing electrochemical systems experience performance and functional losses due to inadequate interaction between elastomer seals and adjacent components, leading to excessive local stress, deformation, and damage, particularly at the edge of the flow field, which can result in leakage and loss of structural support for components like MEAs and PTLs.
Innovation Solution
A sealing arrangement with a frame-shaped layer and an elastomeric sealing element that includes a support region for components like PTLs, where the support region is lowered relative to the layer plane to provide structural support and reduce local stress, ensuring reliable sealing and positioning of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomer seals are used to seal the flow field, then sealing effect is improved, but excessive local stress and deformation occur at the edge of the flow field
Solution Approach 1:
The sealing element is designed with differentiated local properties: a support region with increased thickness or reinforcement at the edge of the flow field to distribute stress, while the central sealing region maintains its sealing function. This local quality variation allows the sealing element to simultaneously provide sealing and structural support without causing excessive stress concentration.
Solution Approach 2:
The sealing element is pre-formed with an integrated support structure (such as a reinforced edge or protruding support region) before assembly. This preliminary structural preparation ensures that when the sealing element is installed, it immediately provides both sealing and mechanical support, preventing deformation of adjacent components like the membrane electrode assembly from the outset.
2Reliability
If sealing elements are pressed to achieve sealing, then sealing performance is improved, but components like PTL and MEA become deformed or damaged
Solution Approach 1:
The sealing element incorporates a support region with enhanced mechanical properties (increased thickness, reinforcement, or different material composition) located at the edge of the flow field. This local quality variation allows the sealing element to distribute pressing forces evenly, preventing stress concentration that would otherwise deform or damage the PTL and MEA components.
Solution Approach 2:
The sealing element is pre-designed with an integrated support structure that acts as a cushioning element before assembly. This support region absorbs and distributes the pressing forces during assembly and operation, preventing excessive local stress from being transmitted to the PTL and MEA, thereby protecting these components from deformation or damage.
3Temperature
If additional cooling layers are added to separator plates, then cooling capability is improved, but device complexity increases
Solution Approach 1:
The sealing element is designed to perform multiple functions simultaneously: it provides sealing of the flow field, structural support to prevent component deformation, and thermal management through its thermally conductive support region. This multi-functionality eliminates the need for separate cooling layers, maintaining device simplicity while achieving effective cooling.
Solution Approach 2:
The sealing element combines sealing and cooling functions into a single integrated component. The support region of the sealing element is designed with thermal conductivity to facilitate heat dissipation, merging the previously separate functions of sealing and cooling into one element, thereby reducing device complexity.
Data Source
AI summary
The present disclosure relates to a sealing arrangement for an electrochemical system, wherein the sealing arrangement is loadable transverse to a layer plane when installed in the electrochemical system, the sealing arrangement comprising a frame-shaped layer with a recess, wherein the recess is arranged to surround an electrochemically active region of the electrochemical system in the form of a frame, and wherein the recess has an inner edge, and an elastomeric sealing element, an inner edge region of which rests against the inner edge of the recess and an outer edge region of which projects into the recess, wherein the outer edge region comprises, at least on a first outer side, at least in sections, a support region for a component of the electrochemical system, which is lowered relative to an adjacent first region of the sealing element.