Fuel Cell End Plate Rib Positioning for Uniform Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing end plates in fuel cell systems experience uneven cooling due to the coolant flow path design, where the outlet is positioned higher than the inlet, leading to less smooth coolant flow in the lowest portion of the flow path, resulting in inefficient cooling of the cell stack.
Innovation Solution
The end plate design features a recess with a pair of upper and lower inner wall surfaces that spread vertically toward the outlet, and the lowermost rib is positioned closer to the inlet than the other ribs, ensuring a more uniform coolant flow through the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outlet is located at a position higher than the inlet to prevent air accumulation, then air removal is improved, but coolant flow uniformity deteriorates
Solution Approach 1:
The lowermost rib is positioned closer to the inlet than other ribs, creating local variation in the flow path structure. This asymmetric arrangement ensures that coolant flows uniformly through all partitioned portions despite the outlet being higher than the inlet, resolving the contradiction between air removal effectiveness and flow uniformity.
2Reliability
If the outlet is located at a position higher than the inlet, then air accumulation is prevented, but coolant flow smoothness in the lowest portion deteriorates
Solution Approach 1:
By positioning the lowermost rib closer to the inlet, the flow path structure is locally optimized to maintain smooth coolant flow through the lowest portion, preventing both air accumulation and flow irregularities.
3Manufacturing precision
If the lowermost rib is positioned closer to the inlet, then coolant flow uniformity is improved, but the flow path geometry becomes more complex
Solution Approach 1:
The design introduces minimal geometric variation by only adjusting the position of the lowermost rib relative to others, achieving flow uniformity without substantially increasing overall structural complexity.
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 configuration prevents uneven cooling by ensuring smooth coolant flow in all portions of the flow path, effectively maintaining consistent cooling across the cell stack.
Implementation Method 1
The coolant flows in the horizontal direction through the portions in the flow path that are partitioned by the ribs. The coolant cools the end in the cell stacking direction of the cell stack.
Data Source
AI summary
An end plate has a recess extending in the horizontal direction and configured to form a flow path in which cooling water flows. Ribs are formed on the bottom surface of the recess and arranged at intervals in the vertical direction so as to extend in the horizontal direction. The cooling water flows in from the passage of a cell stack at one end in the horizontal direction of the recess. A hole that allows the cooling water to flow out is provided at the other end and at a position higher than the portion into which the cooling water flows. The inner wall surfaces of the recess spread vertically toward the hole in the portion connected to the passage. The end close to the passage of the lowermost one of the ribs is closer to the hole than the ends close to the passage of the other ribs.