Bipolar Plate Opening Geometry for Unblocked Electrochemical Cell Flow
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Solution Overview
Problem
Existing bipolar plates in electrochemical cell stacks face challenges in securely guiding media, such as hydrogen and oxygen, while maintaining mechanical support and preventing blockage under high tensioning forces, as conventional port grommets can be crushed or occluded, affecting the even reaction and electrical energy generation.
Innovation Solution
A bipolar plate design featuring a first and second monopolar plate with strategically placed opening elements between ports and the active surface, where the opening elements have a deflection angle of 30° to 120°, allowing media to flow while providing mechanical support and preventing blockage, and incorporating materials like carbon, metal, or alloys for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional port grommets are used to guide media in bipolar plates, then the structure is simple and easy to manufacture, but the grommets can be crushed or occluded under high tensioning forces, leading to blockage and affecting media flow reliability
Solution Approach 1:
The patent removes the vulnerable port grommet component entirely and replaces it with opening elements directly integrated into the bipolar plate structure. This extraction eliminates the crushing and occlusion problems associated with separate grommets while maintaining the media guidance function through the opening elements that extend from the port through the active surface.
Solution Approach 2:
The opening elements are merged directly into the bipolar plate structure, combining the media guidance function with the plate itself. This integration eliminates the need for separate grommets and ensures that the media passage structure maintains the mechanical strength and tension resistance of the bipolar plate material.
2Reliability
If opening elements with deflection angle of 30° to 120° are used, then mechanical support and blockage prevention are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a deflection angle range of 30° to 120° for the opening elements, which provides mechanical support to prevent blockage while allowing for reasonable manufacturing tolerances. This parameter optimization balances the need for blockage prevention with the practical constraints of manufacturing precision.
3Productivity
If bipolar plates use traditional flat structure, then manufacturing is simple, but media distribution evenness and reaction uniformity are insufficient
Solution Approach 1:
The opening elements are configured with a deflection angle rather than being perfectly straight, creating a curved or angled passage that provides mechanical support while maintaining media flow. This angular geometry improves media distribution and reaction uniformity without requiring complex three-dimensional curved structures.
Data Source
AI summary
The invention relates to a bipolar plate (7) for an electrochemical cell (1), said bipolar plate comprising a first monopolar plate (13) and a second monopolar plate (17), at least one port (55), a seal (47), and an active surface (53), wherein the first monopolar plate (13) and/or the second monopolar plate (17) have at least one opening element (111) for the passage of at least one medium (29), the at least one opening element (111) is located between the at least one port (55) and the active surface (53) and has a first opening surface (113) and a second opening surface (115), wherein the first opening surface (113) and the second opening surface (115) have a common lateral line (117), and the first opening surface (113) and the second opening surface (115) are arranged at a deflection angle (119) to one another in a range of 30° to 120°. The invention also relates to an arrangement (69) of electrochemical cells (1) and to a method for operating the arrangement (69) of electrochemical cells (1).