Electrochemical Stack Clamping Structure for Gas Leak Prevention
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Solution Overview
Problem
Existing electrochemical modules face issues with gas leakage due to gaps between members in contact, particularly in regions with different clamping pressures, leading to inefficiencies in gas flow and sealing within the stack.
Innovation Solution
The electrochemical module incorporates a stack configuration with a first clamping portion and a second clamping portion, featuring an elastic plate-like member to apply uniform pressure, and a flowing pipe connected to an annular sealing portion, ensuring consistent clamping pressure and preventing gas leakage through gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sufficient clamping pressure is applied to the region on which electrode structures are stacked, then sealing performance of the electrode structure is improved, but insufficient clamping pressure is applied to the region on which the supply/discharge unit is provided, causing gas leakage
Solution Approach 1:
The clamp is divided into a first clamping portion and a second clamping portion, where the first clamping portion applies clamping force to the electrode structure region and the second clamping portion applies clamping force to the supply/discharge unit region. This local differentiation ensures that each region receives appropriate clamping pressure tailored to its specific sealing requirements, preventing gas leakage at both locations simultaneously.
2Stability of the object's composition
If uniform clamping pressure is applied to the whole stack, then overall structural stability is improved, but gaps are generated between the annular article and contact members in the supply/discharge unit region, leading to gas leakage
Solution Approach 1:
The clamp transitions from uniform clamping to localized differential clamping. The first clamping portion and second clamping portion are positioned at different locations along the stack, with the second clamping portion specifically targeting the supply/discharge unit region. This allows the stack to maintain overall structural stability while applying enhanced localized pressure where gaps and leakage risks exist.
Solution Approach 2:
The clamp is segmented into multiple functional portions (first clamping portion and second clamping portion) that can independently apply pressure to different regions of the stack. This segmentation enables differentiated pressure distribution, allowing the supply/discharge unit region to receive sufficient clamping force to prevent gap formation and gas leakage, while other regions maintain adequate but not excessive pressure.
3Stability of the object's composition
If connection bars are fixed to four positions in the peripheral portion of end plates, then overall clamping stability is improved, but clamping pressure distribution becomes insufficient in specific regions, causing gas leakage
Solution Approach 1:
The clamp acts as an intermediary component between the connection bars/end plates and the stack. While the connection bars provide overall structural support and stability through four-position fixing, the clamp is positioned between them and the stack to deliver focused, distributed clamping pressure. This intermediary role allows the clamp to compensate for pressure distribution deficiencies, ensuring adequate pressure reaches the supply/discharge unit region to prevent gas leakage.
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 effectively suppresses gas leakage by maintaining uniform clamping pressure across the stack, enhancing the sealing efficiency and durability of the electrochemical module, even with thermal expansion variations.
Implementation Method 1
an elastic first plate-like member arranged between the first flat face and the first clamping portion
Data Source
AI summary
An electrochemical module including, a stack obtained by stacking, in a predetermined stacking direction, a plurality of electrochemical elements having a configuration in which an electrode layer, an electrolyte layer, and a counter electrode layer are formed along a substrate, via an annular sealing portion through which first gas, that is one of reducing component gas and oxidative component gas, flows; a container including an upper cover for pressing a first flat face in the stacking direction of the stack and a lower cover for pressing a second flat face on a side opposite to the first flat face, the stack clamped between the upper cover and the lower cover; an elastic lower plate-like member arranged between the first flat face and the upper cover; and a first gas supply portion and a first gas discharge portion connected to the second flat face in communication with the annular sealing portion.