Fuel Cell Module Cleavage Part Crack Containment
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Solution Overview
Problem
Conventional fuel cell modules risk excessive crack extension and exposure of high-voltage components due to pressure reduction mechanisms, compromising safety and operability.
Innovation Solution
A fuel cell module design featuring a housing with a partition wall, a cleavage part of lower strength, a high-rigidity part of higher strength, and elongated protrusions, which directs cracks away from high-voltage areas, using cast aluminum for reduced manufacturing costs and weight, and an insulating member to prevent electrical exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a rupture disc is used as pressure-reduction means, then the internal pressure can be reduced when it exceeds a predetermined value, but a crack may extend to the fuel cell case beyond the pressure-reduction means, exposing high-voltage parts
Solution Approach 1:
The partition wall is segmented into three distinct functional zones: a cleavage part with lowest strength for pressure release, a high-rigidity part with highest strength to contain cracks, and elongated protrusions with intermediate strength. This segmentation ensures that when pressure reduction occurs, cracks are confined to the cleavage part and cannot extend to expose high-voltage components.
Solution Approach 2:
Different regions of the partition wall are given different mechanical properties (strength and rigidity) to perform different functions. The cleavage part has lowest strength for easy cleavage, the high-rigidity part has highest strength for crack containment, and elongated protrusions have intermediate strength. This local differentiation of material properties resolves the contradiction between pressure reduction and safety.
2Volume of moving object
If the distance between the fuel cell case and the insulating member is reduced for compactness, then the fuel cell becomes more compact, but the insulating member may be damaged or separated when internal pressure decreases
Solution Approach 1:
The insulating member is extracted from direct contact with the fuel cell case and positioned only against the elongated protrusions. This allows the insulating member to be isolated from pressure-induced deformation zones, protecting it from damage while enabling compact overall design.
Solution Approach 2:
The elongated protrusions serve as intermediary structures between the fuel cell case and the insulating member. They provide a stable support surface for the insulating member that is decoupled from the pressure-release mechanism, allowing compact design without compromising insulating member integrity.
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
The design effectively prevents crack extension beyond the cleavage part, ensuring safety by releasing pressure and isolating high-voltage components, while reducing manufacturing costs and weight through a simplified component structure.
Implementation Method 1
a cleavage part on the partition wall that cleaves when an internal pressure of the housing increases to a predetermined pressure
Data Source
AI summary
A fuel cell module can prevent excessive extending of crack in a cleavage part when the cleavage part cleaves to reduce internal pressure of the housing that stores the fuel cell stack and can prevent the exposure of a high-voltage part inside of the housing. The fuel cell module includes a fuel cell stack and a housing that stores the fuel cell stack. The housing includes a partition wall, a cleavage part on the partition wall that cleaves when the internal pressure of the housing increases to a predetermined pressure, a high-rigidity part on the partition wall to surround the cleavage part, and a plurality of elongated protrusions on the partition wall outside of the high-rigidity part. The strength of the cleavage part is lower than the elongated protrusions and the strength of the high-rigidity part is higher than the elongated protrusions and can prevent extension of a crack in the cleavage part.