Corrugated Bipolar Plate Layout for Sealing and Cooling Stability
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Solution Overview
Problem
Conventional electrochemical systems face challenges in compensating for geometric inaccuracies during series production while maintaining tightness and ensuring efficient cooling and deformation absorption in stacked bipolar plates.
Innovation Solution
The electrochemical system employs bipolar plates composed of two structured half-plates with corrugation peaks and valleys, forming mirror-symmetrical coolant channels and flow channels that diverge in a transition region, allowing for flexible membrane assembly support and deformation absorption, and providing large, streamlined coolant channels for efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional flat bipolar plates are used in electrochemical systems, then manufacturing is simple, but geometric inaccuracies during series production cannot be compensated while maintaining tightness
Solution Approach 1:
The bipolar plate incorporates a corrugated structure with alternating peaks and valleys instead of a flat surface. This curvature allows the plate to absorb geometric variations and maintain tight sealing between stacked plates, compensating for manufacturing inaccuracies while preserving structural integrity
Solution Approach 2:
The invention changes the geometric parameters of the bipolar plate by introducing a corrugated profile with specific peak and valley dimensions. This parameter modification enables the plate to accommodate dimensional variations during assembly while maintaining functional performance and sealing effectiveness
2Volume of moving object
If bipolar plates are densely stacked to increase system compactness, then space utilization improves, but cooling efficiency deteriorates due to restricted coolant flow
Solution Approach 1:
The corrugated structure introduces a third dimension to the bipolar plate design, creating vertical peaks and valleys that form coolant channels. This dimensional addition allows coolant to flow through the stack density without compromising cooling efficiency, as the channels provide dedicated thermal management pathways independent of the horizontal stacking arrangement
Solution Approach 2:
The bipolar plate is segmented into multiple corrugation peaks and valleys that create separate coolant flow paths. This segmentation allows coolant to access multiple channels simultaneously, maintaining effective cooling even when plates are densely stacked, as each corrugation element provides independent thermal management capability
3Stability of the object's composition
If membrane assembly is rigidly fixed between bipolar plates, then structural stability improves, but deformation absorption and flexibility are reduced
Solution Approach 1:
The membrane assembly is positioned within the corrugated structure where it can flex between the peaks and valleys. This configuration allows the membrane to adapt to dimensional variations and thermal expansion while the corrugated bipolar plates provide overall structural stability, creating a system that accommodates both rigidity and flexibility requirements
Solution Approach 2:
The corrugated bipolar plate structure dynamically adapts to thermal and mechanical loads by allowing controlled deformation of the membrane assembly between the rigid peaks and valleys. This dynamic configuration enables the system to maintain stability under normal operation while absorbing deformations during thermal cycling or pressure changes
4Productivity
If coolant channels are made small to fit more plates in a stack, then stack density improves, but cooling performance deteriorates
Solution Approach 1:
The coolant channels are formed in the vertical dimension through the corrugation peaks and valleys rather than being constrained to horizontal planes. This dimensional approach allows each plate to contribute multiple cooling channels without increasing the horizontal footprint, maintaining both high stack density and effective cooling performance through three-dimensional coolant flow paths
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 design effectively compensates for geometric inaccuracies, maintains tightness, and ensures efficient cooling and deformation absorption, even in densely stacked configurations, while allowing for flexible membrane deflection and thermal/external force absorption.
Implementation Method 1
each of which is composed of two structured half-plates describing corrugation peaks and corrugation valleys. Coolant channels are formed between the half-plates of each bipolar plate through the corrugation peaks and corrugation valleys
Implementation Method 2
the deflectability of the membrane assembly through the said bipolar plates, viewed in the transverse direction of the flow channels, is alternately blocked in only one direction... a certain flexibility of the membrane assembly is exploited, which allows a wave-like deflection of the membrane assembly
Data Source
AI summary
An electrochemical system comprises a plurality of stacked bipolar plates, each of which is composed of two structured half-plates that describe corrugation peaks and corrugation valleys. Coolant channels are formed between the half-plates of each bipolar plate by means of the corrugation peaks and corrugation valleys, and at the same time the outer faces of the bipolar plates delimit flow channels for operating media. A membrane assembly is located between each pair of bipolar plates. An assembly of flow channels, said assembly being mirror-symmetrical with respect to a plane on which the membrane assembly lies, transitions into an assembly which is offset in the transverse direction in a transition region between an active field and a distributing field of each bipolar plate.