Pressure Equalization Plate for Uniform Stack Compression
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Solution Overview
Problem
Existing electrochemical systems face issues with inconsistent and non-uniform compressive forces due to uneven support between the stack and end plate assemblies, leading to unreliable sealing and impaired functionality.
Innovation Solution
Incorporation of a pressure equalization plate between the stack and end plate assembly, which features recesses and solid regions to ensure uniform surface contact and support, compensating for local deviations in compressive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If end plate assemblies directly clamp the stack, then mechanical bracing is achieved, but uniform pressure distribution is not achieved due to recesses in the end plate assembly
Solution Approach 1:
A pressure equalization plate is introduced as an intermediary component between the end plate assembly and the stack. This plate fills the recesses in the end plate assembly and provides a flat, uniform contact surface that distributes compressive forces evenly across the stack, eliminating the pressure concentration issues caused by the recesses while maintaining the mechanical bracing function.
Solution Approach 2:
The pressure equalization plate is designed with a segmented structure featuring multiple solid regions separated by recesses. These solid regions correspond to areas requiring higher support, allowing differential pressure distribution tailored to specific zones of the stack, thereby optimizing both mechanical bracing and pressure uniformity.
2Adaptability or versatility
If end plate assemblies have recesses for structural features, then structural functionality is achieved, but contact surface continuity is interrupted
Solution Approach 1:
The pressure equalization plate serves as a mediator that bridges the gap created by recesses in the end plate assembly. It provides a continuous contact surface for the stack while allowing the end plate assembly to maintain its structurally necessary recesses, thus preserving both structural functionality and contact surface continuity.
3Reliability
If clamping force is applied to pretension sealing elements, then sealing effect is achieved, but local compression uniformity is compromised
Solution Approach 1:
The pressure equalization plate acts as a mediator between the clamping force and the sealing elements, distributing the compressive force uniformly across all sealing locations. This ensures that each sealing element receives the appropriate pretension force without local over-compression or under-compression, thereby maintaining both sealing reliability and compression uniformity.
Data Source
AI summary
The present disclosure relates to an electrochemical system, in particular an electrochemical system having a stack comprising at least a plurality of electrochemical cells and separator plates, at least one end plate assembly, and at least one pressure equalization plate arranged between the stack and the end plate assembly, wherein a side of the end plate assembly that faces the stack has at least a first recess and a first solid region of the pressure equalization plate lies opposite this first recess.