Fuel Cell Stack Case Recess for Electrical Equipment
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Solution Overview
Problem
In fuel cell systems, the interruption control unit protrudes significantly from the stack case, making it difficult to accommodate both the stack case and electrical equipment in a compact space, especially when mounted in a fuel cell vehicle where collision protection is a concern.
Innovation Solution
The electrical equipment unit is placed in a recess within the stack case, with strategically positioned screw holes and bolts that allow for a more compact design without increasing the length of the stack case, and a screw hole that penetrates through the case body to the recess side surface, enabling a compact placement of the stack case and electrical equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrical equipment unit is placed on the flat outer surface of the stack case, then the equipment is easily accessible, but the protrusion length becomes large making compact placement difficult
Solution Approach 1:
The patent applies nesting by placing the electrical equipment unit inside a recess formed in the outer surface of the stack case. The recess is positioned between screw holes and allows the electrical equipment to be nested within the stack case structure rather than protruding outward, thereby reducing the overall protrusion length while maintaining accessibility through the recess opening.
Solution Approach 2:
The patent utilizes the spatial dimension by creating a recess that extends into the stack case body rather than allowing protrusion outward. This dimensional reconfiguration moves the electrical equipment from an external protruding position to an internal embedded position, effectively reducing the protrusion length while preserving functional accessibility.
2Volume of moving object
If a recess is formed in the stack case to accommodate electrical equipment, then compact placement is achieved, but the case structure becomes more complex
Solution Approach 1:
The patent segments the stack case structure by forming a recess as a distinct feature within the case body. This recess is positioned between existing screw holes and is integrated into the case structure without requiring separate mounting brackets or external housings, thereby reducing overall structural complexity while achieving compact placement.
Solution Approach 2:
The patent merges the electrical equipment housing function directly into the stack case structure by forming the recess as an integral part of the case. This eliminates the need for separate external housings or mounting structures, combining multiple functions into a single integrated component and reducing overall structural complexity.
3Volume of moving object
If the first screw hole penetrates through the case body to the recess side surface, then compact design is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by positioning the first screw hole to penetrate specifically through the case body at a location that aligns with the recess. This localized penetration point is chosen to optimize compactness while maintaining manufacturability, allowing the screw to access the recess area without requiring excessive precision across the entire case structure.
Solution Approach 2:
The penetrating screw hole acts as an intermediary element that connects the external fastening system with the internal recess structure. This intermediary feature enables compact design by allowing bolts to secure the electrical equipment within the recess while maintaining alignment and positioning accuracy through the case body, thereby managing precision requirements through a mediating structural element.
Data Source
AI summary
A stack case of a fuel cell system includes a case body, a first end cover, and a second end cover. A recess is formed in an upper surface of the case body. An interruption control unit as an electrical equipment unit is placed in the recess. A plurality of first screw holes are formed in one end surface of the case body, and a plurality of second screw holes are formed in the other end surface of the case body. A first screw hole aligned with a recess in a direction in which a plurality of power generation cells are stacked together penetrates through the case body from one end surface of the case body to a side surface of the recess.