Fuel Cell Stack Bypass Channel for Condensation Water Drainage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell stacks face challenges in effectively suppressing the intrusion of liquid water, such as dew condensation water, into power generation cells, which can lead to clogging and reduced performance.
Innovation Solution
A fuel cell stack design featuring a bypass channel and an annular protrusion in the insulating plates, with an inclined section in the first plate passage, which directs dew condensation water towards a lower discharge passage, preventing its intrusion into power generation cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a bypass channel is provided to drain liquid water, then liquid water can be discharged from the system, but liquid water may still intrude into power generation cells causing clogging and performance reduction
Solution Approach 1:
The annular protrusion is positioned upstream in the reactant gas supply passage to intercept and redirect liquid water before it can enter the power generation cells. This preliminary action prevents water intrusion at the source rather than merely draining it after entry.
Solution Approach 2:
The reactant gas supply passage is segmented into multiple passages (first plate passage and second plate passage) at different heights. The bypass channel connects specifically to the lower second plate passage, creating separate drainage paths that prevent water from reaching the upper power generation cells while maintaining gas supply to both.
2Object-generated harmful factors
If the reactant gas supply passage is positioned at a low location to facilitate drainage, then liquid water can flow out more easily, but liquid water may accumulate and intrude into power generation cells
Solution Approach 1:
The solution transitions from a single-level passage to a multi-level vertical arrangement. The first plate passage is positioned at a higher vertical dimension than the second plate passage, allowing the bypass channel to drain water from the lower passage without compromising the upper passage's ability to supply gas to power generation cells.
Solution Approach 2:
The annular protrusion acts as an intermediary structure that redirects liquid water from the reactant gas supply passage into the bypass channel. It intercepts water at the inlet and channels it away before water can accumulate or intrude into critical areas.
3Reliability
If multiple discharge passages are provided at different heights, then liquid water can be effectively drained without intruding into power generation cells, but the device structure becomes more complex
Solution Approach 1:
The bypass channel serves multiple functions: it drains liquid water from the second plate passage, prevents water intrusion into power generation cells, and maintains proper gas flow distribution. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The annular protrusion is integrated directly into the insulating plate structure, combining the drainage function with the structural support function. This integration reduces the number of separate parts while achieving both structural integrity and water drainage capabilities.
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 suppresses the intrusion of liquid water, preventing clogging and maintaining oxygen-containing gas flow, thereby enhancing power generation performance and extending the life of the fuel cell stack.
Implementation Method 1
a lower portion of an inner surface of the first plate passage includes an inclined section that is inclined upward toward a downstream of the reactant gas
Data Source
AI summary
In the fuel-cell stack, a bypass channel is formed between the first insulating plate and the second insulating plate. The bypass channel connects the second plate passage to the lower oxygen-containing gas discharge passage. An annular protrusion protruding toward the second plate passage is provided around the first plate passage. A lower part of an inner surface forming the first plate passage has an inclined section that is inclined upward toward the downstream of the reaction gas.