Resilient Flow Structures for Electrochemical Cells
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Solution Overview
Problem
The existing design of flow structures in electrochemical cells, particularly under high pressure differentials, leads to reduced contact pressure and increased contact resistance, resulting in inefficiency due to the separation of the membrane electrode assembly (MEA) from the flow structure on the high-pressure side.
Innovation Solution
The design of resilient flow structures that can expand elastically to maintain contact with the MEA, incorporating materials with lower stiffness and elastic modulus than traditional flow structures, such as steel wool or metallic foams, and incorporating spring mechanisms like spiral disk springs or dimple plates to counteract pressure-induced separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional rigid flow structures are used, then structural strength is maintained, but contact pressure is lost and cell resistance increases under high pressure differentials
Solution Approach 1:
The patent changes the mechanical parameter of the flow structure from rigid to resilient by selecting materials with appropriate elastic moduli. The resilient flow structure on the high-pressure side is designed to expand elastically under differential pressure, maintaining contact with the MEA while the rigid flow structure on the low-pressure side provides structural support.
Solution Approach 2:
The patent employs a composite structure combining resilient and rigid materials in different locations. The resilient flow structure uses materials like springy metals or carbon fiber composites that can deform elastically, while the rigid flow structure uses traditional strong materials, creating a composite system that achieves both contact pressure maintenance and structural strength.
2Reliability
If resilient materials with lower stiffness are used, then contact pressure is maintained under pressure differentials, but structural strength is reduced
Solution Approach 1:
The patent applies different material properties to different locations within the flow structure system. The high-pressure side flow structure uses resilient materials with lower stiffness to maintain contact pressure, while the low-pressure side flow structure uses rigid materials with higher stiffness to provide structural strength, optimizing each location for its specific functional requirements.
Solution Approach 2:
The patent changes the elastic modulus parameter of the flow structure material to achieve resilience. By selecting materials with lower elastic moduli (such as springy metals or carbon fiber composites) for the high-pressure side flow structure, the system enables elastic expansion under differential pressure while maintaining adequate contact pressure with the MEA.
3Power
If high pressure differentials are applied, then power output is increased, but separation between MEA and flow structure occurs
Solution Approach 1:
The patent introduces dynamic adaptability to the flow structure system by making the high-pressure side flow structure resilient rather than rigid. This allows the flow structure to dynamically adjust its position and contact pressure in response to varying differential pressures, maintaining reliable contact across a range of operating conditions including high power output scenarios.
Solution Approach 2:
The patent changes the mechanical compliance parameter of the flow structure to enable adaptive response to pressure differentials. The resilient flow structure's ability to expand elastically allows it to compensate for MEA displacement caused by high pressure differentials, preventing separation and maintaining contact even when operating at high power levels with elevated differential pressures.
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 maintains adequate contact pressure and reduces cell resistance across a range of pressure differentials, with cell resistance measurements remaining less than six times the baseline at up to 14,000 psi, enhancing the efficiency and performance of electrochemical cells under high-pressure conditions.
Implementation Method 1
the first flow structure can be configured to expand elastically relative to a displacement of the membrane electrode assembly caused by a pressure differential between the first flow structure and the second flow structure
Data Source
Figure 1
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Figure 3A
AI summary
An electrochemical cell is disclosed comprising, a first flow structure, a second flow structure, and a membrane electrode assembly disposed between the first and second flow structures. The electrochemical cell further comprises a pair of bipolar plates, wherein the first flow structure, the second flow structure, and the membrane electrode assembly are positioned between the pair of bipolar plates. The electrochemical cell also includes a spring mechanism, wherein the spring mechanism is disposed between the first flow structure and the bipolar plate adjacent to the first flow structure, and applies a pressure on the first flow structure in a direction substantially toward the membrane electrode assembly.