Fuel Cell Bipolar Plate Diaphragm for Adjustable Media Flow
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Solution Overview
Problem
The existing bipolar plates for fuel cell stacks face challenges in efficiently adapting performance due to high material consumption and increased manufacturing costs, as they require adapting the cross-sectional shape of insert elements to match media ports, leading to inefficient media distribution and dynamic performance adjustments.
Innovation Solution
A bipolar plate design featuring media guides with tapered sub-chambers and adjustable diaphragms, allowing for dynamic adjustment of flow cross-sections without additional guide elements, enabling flexible media distribution and moisture balance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cross-sectional shape of insert elements is adapted to match media ports, then media distribution is improved, but material consumption and manufacturing costs increase
Solution Approach 1:
The tapered sub-chamber serves multiple functions: it guides the diaphragm, provides sealing contact, and defines the flow cross-section. This eliminates the need for separately shaped insert elements, reducing material consumption while maintaining precise media distribution control.
Solution Approach 2:
The flow cross-section is controlled by adjusting the position of the diaphragm within the tapered sub-chamber rather than changing the physical shape of insert elements. This allows dynamic adjustment of media distribution without requiring multiple customized components.
2Ease of manufacture
If fixed diameter passages are used in bipolar plates, then manufacturing is simplified, but dynamic adjustment of power profile becomes difficult
Solution Approach 1:
The diaphragm can be adjusted dynamically within the tapered sub-chamber to change the flow cross-section of the passage. This enables real-time adjustment of the fuel cell stack's power profile without requiring complex manufacturing processes or multiple fixed-diameter components.
Solution Approach 2:
The media channel is divided into a tapered sub-chamber section and a passage section. The tapered sub-chamber acts as an adjustable flow control zone that can modify the effective cross-section of the passage, combining manufacturing simplicity with dynamic adaptability.
3Manufacturing precision
If additional guide elements are added for insert elements, then positioning precision is improved, but device complexity and material consumption increase
Solution Approach 1:
The guiding function is merged into the bipolar plate structure itself through the tapered sub-chamber walls. The diaphragm is guided directly by the tapered geometry of the sub-chamber, eliminating the need for separate guide elements and reducing overall device complexity.
Solution Approach 2:
The tapered sub-chamber acts as an intermediary structure that provides both guidance and sealing for the diaphragm. This intermediate geometric feature enables precise positioning without requiring additional mechanical guide components.
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 reduces material consumption, simplifies production, and allows for dynamic performance adjustments, optimizing media supply and electrical power delivery in fuel cell stacks, particularly in response to varying operational demands.
Implementation Method 1
the flow cross-section of the media channel is tapered between the first and second sub-chambers, and an orifice plate can be inserted or is already inserted into the second sub-chamber
Data Source
Figure 1
AI summary
The invention relates to a bipolar plate (1) for a fuel cell stack, having an active region (3) and a peripheral region (4) surrounding the active region (3), to which there are assigned a first media supply (10) fluidically connected to a first passage (5) and a second media supply (7) fluidically connected to a second passage (6), and having a media channel (8) that runs through the active region (3) and fluidically connects the first passage (5) to the second passage (6). At least one of the media supplies (10, 7) comprises a first part chamber (2) and a second part chamber (11) having the passage (5, 6). A flow cross section of the media supply (10, 7) is tapered between the first part chamber (2) and the second part chamber (11), and a diaphragm (9) is or can be inserted into the second part chamber (11). The invention also relates to a fuel cell stack.