Fuel Cell Unit Intermediate Plate Clearance Design
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Solution Overview
Problem
Fuel cell units face space constraints due to the need for separate clearances between components, which increases the overall space required within the unit.
Innovation Solution
A fuel cell unit design that incorporates an intermediate plate to house the fuel cell stack and electrical components, where the electrical component is fixed above the fuel cell stack with a through-hole in the intermediate plate allowing the lower portion to pass through, overlapping the clearance needed for both, and additional ribs for structural support and coolant management to prevent coolant leakage onto the fuel cell stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate clearances are provided between the fuel cell stack and case, and between electrical component and case, then each component has sufficient space for operation and maintenance, but the total space required in the fuel cell unit increases
Solution Approach 1:
The patent merges the clearance functions by allowing the electrical component to extend through the intermediate plate into the lower space, where its lower portion serves as the clearance space between the fuel cell stack and intermediate plate. This combining of clearance functions reduces the total volume required while maintaining necessary operational clearances for both components.
Solution Approach 2:
The electrical component is positioned to extend in the vertical dimension through the intermediate plate, utilizing the third dimension (height) to overlap clearance spaces. By arranging components in multiple vertical levels rather than separate horizontal planes, the design reduces the overall footprint while maintaining required clearances.
2Strength
If the intermediate plate is made solid to maintain structural strength, then the case rigidity is sufficient to support the fuel cell stack, but space for electrical component clearance is reduced
Solution Approach 1:
The intermediate plate is segmented by introducing a through-hole that allows the electrical component to pass through. This segmentation creates a localized opening for clearance purposes while maintaining the overall structural integrity of the plate, as the surrounding plate material continues to provide rigidity support for the fuel cell stack.
Solution Approach 2:
The intermediate plate has different properties in different locations: it is solid in most areas to maintain structural strength, but has a through-hole in the specific location where electrical component clearance is needed. This local modification provides clearance space exactly where required without compromising the overall rigidity of the case structure.
Data Source
AI summary
A fuel cell unit includes a fuel cell stack, a reactor, and a case housing the fuel cell stack and the reactor. The case is provided with an intermediate plate that partitions a space inside the case into an upper space and a lower space. The fuel cell stack is housed in the lower space, with a predetermined clearance provided between the intermediate plate and the fuel cell stack. The reactor is housed in the upper space above the fuel cell stack, with an upper portion of the reactor fixed to the case. A through-hole that is provided in the intermediate plate at a position below the reactor. The lower portion of the reactor faces the through-hole.