Bipolar Plate Seal Geometry for Electrochemical Stack Insulation
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Solution Overview
Problem
Existing electrochemical devices face a high risk of electrical short circuits between bipolar plates due to dirt or contaminated water, which is exacerbated by the accessibility of the outer and inner rim regions of the bipolar plates, and the application of additional electrically insulating layers complicates the manufacturing process.
Innovation Solution
The use of seals that protrude laterally beyond the bipolar plate contours to shield the plates from environmental contaminants and medium channels, forming a closed sealing face to prevent conductive elements from reaching the plate interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional electrically insulating layers are applied in the outer and inner rim regions of the bipolar plates, then the risk of electrical short circuits is reduced, but the production expenditure and process complexity increase significantly
Solution Approach 1:
The seal element is designed to perform multiple functions: it provides medium sealing between channels and simultaneously provides electrical insulation for the bipolar plate rim regions. This multi-functionality eliminates the need for separate insulating layers, reducing production complexity while maintaining insulation reliability.
Solution Approach 2:
The sealing function and insulating function are merged into a single seal element structure. The seal element combines the medium-sealing capability with electrically insulating properties, consolidating what would traditionally require separate components into one integrated element.
2Reliability
If additional electrically insulating layers are applied in the outer and inner rim regions of the bipolar plates, then the risk of electrical short circuits is reduced, but the production time and manufacturing cost increase
Solution Approach 1:
The seal element performs both sealing and insulating functions simultaneously, eliminating the need for separate insulating layer application steps. This reduces the number of manufacturing operations required, thereby improving production efficiency and reducing costs.
Solution Approach 2:
The seal element is pre-formed with both sealing and insulating properties integrated into its structure. This preliminary preparation of the multi-functional component allows for simpler assembly processes and reduces on-site manufacturing steps, improving overall production efficiency.
3Reliability
If the outer and inner rim regions of the bipolar plates are made of more than one layer with electrically insulating properties, then the risk of electrical short circuits is reduced, but the manufacturing complexity and process restrictions increase
Solution Approach 1:
The seal element is designed as a single multi-functional component that provides both medium sealing and electrical insulation. This eliminates the need for complex multi-layer bipolar plate construction, simplifying the manufacturing process while maintaining insulation reliability.
Solution Approach 2:
The seal element acts as an intermediary component between the bipolar plates, providing the insulating function without requiring modification of the bipolar plate structure itself. This mediator approach simplifies manufacturing by keeping the bipolar plates and seal elements as separate, independently manufacturable components.
Data Source
AI summary
In order to create an electrochemical device, comprising a plurality of electrochemical units, which succeed one another along a stack direction, wherein each electrochemical unit comprises a bipolar plate and an electrically insulating seal, and a clamping device for clamping the electrochemical units along the stack direction, in which electrochemical device the risk of a short circuit between adjacent bipolar plates is reduced without the expenditure for the production of the electrochemical device being excessively increased, it is proposed that at least one seal of at least one electrochemical unit in the pressed state protrudes laterally beyond a contour of the bipolar plate of the electrochemical unit in a direction of protrusion directed perpendicularly to the stack direction.