Electrochemical Stack Clamping for Annular Seal Leak Prevention
Find Innovative SolutionsGenerate Solutions
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
An electrochemical module design featuring a stack with a pressing mechanism that applies specific clamping pressure to annular sealing portions independently of the electrochemical reaction areas, using screw members and insulating sealing portions to prevent gas leakage, and incorporating elastic plate-like members to maintain uniform clamping pressure despite thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If uniform clamping pressure is applied to the entire stack surface, then the overall structural stability is improved, but gas leakage occurs at the annular sealing portion due to insufficient localized pressure
Solution Approach 1:
The patent applies different clamping pressures to different regions of the stack. Specifically, the annular sealing portion receives concentrated localized clamping pressure through the annular clamping member, while other regions receive uniform pressure through the plate-like clamping members. This local quality differentiation ensures sufficient sealing pressure at critical interfaces without compromising overall structural stability.
Solution Approach 2:
The clamping mechanism is segmented into multiple independent components: plate-like clamping members for general clamping and an annular clamping member for localized sealing. This segmentation allows each component to perform its specific function optimally - the plate members maintain overall stack compression while the annular member ensures gas-tight sealing at the critical interface between the electrolyte support plate and current collector.
2Reliability
If high clamping pressure is applied to the annular sealing portion, then gas leakage is suppressed, but thermal expansion causes loss of clamping pressure uniformity
Solution Approach 1:
The patent utilizes thermal expansion parameters of materials to its advantage. The annular clamping member and plate-like clamping members are designed with specific thermal expansion coefficients that allow them to expand differentially with temperature changes. This parameter differentiation enables the system to automatically redistribute clamping pressure during thermal cycles, maintaining both localized sealing pressure and overall pressure uniformity despite temperature variations.
Solution Approach 2:
The clamping mechanism incorporates self-adjusting features that automatically compensate for thermal expansion effects. As temperature increases, the differential expansion of the annular and plate-like members naturally redistributes the clamping forces, maintaining adequate pressure at the sealing interface while preventing excessive pressure elsewhere. This self-service mechanism eliminates the need for external control systems.
3Device complexity
If the stack structure is simplified without additional pressing mechanisms, then device complexity is reduced, but gas leakage occurs due to insufficient localized clamping pressure
Solution Approach 1:
The patent achieves multi-functionality by designing the annular clamping member to simultaneously provide localized sealing pressure and contribute to overall stack clamping. The plate-like clamping members serve dual purposes of general structural support and heat dissipation. This universal design approach ensures reliable sealing without requiring complex additional pressing mechanisms, maintaining structural simplicity while achieving the necessary localized pressure.
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
The solution effectively suppresses gas leakage by ensuring appropriate clamping pressure is applied to all contact regions, enhancing the module's sealing efficiency and durability while accommodating thermal expansion, resulting in a reliable and efficient energy conversion system.
Implementation Method 1
a pressing mechanism that presses a portion to which the annular sealing portion is attached against the clamp in the stacking direction
Implementation Method 2
incorporating elastic plate-like members to maintain uniform clamping pressure despite thermal expansion
Implementation Method 3
annular sealing portions through which first gas that is one of reducing component gas and oxidative component gas flows
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 that includes 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 being sandwiched between the upper cover and the lower cover; and a pressing mechanism that presses a portion to which the annular sealing portion is attached against the container in the stacking direction.