Fuel Cell Stack Case Rear Opening Multilayer Filter Design
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Solution Overview
Problem
The existing fuel cell systems lack effective protection for the cell voltage detection terminal when exposed, and there is a risk of the multilayer filter being broken due to foreign matter or improper handling during maintenance.
Innovation Solution
A multilayer filter is integrated into the rear opening of the stack case, comprising an inner mesh member, a filter member, and an outer mesh member, with the filter member protected by being sandwiched between these mesh members, preventing damage and ensuring proper ventilation while maintaining terminal accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cell voltage detection terminal is exposed in the rear opening for maintenance access, then ease of operation is improved, but the terminal becomes vulnerable to foreign matter and damage
Solution Approach 1:
The opening is segmented into multiple functional layers: an inner mesh member for terminal access, a filter member for foreign matter filtration, and an outer mesh member for structural protection. Each layer serves a specific function while collectively solving the contradiction between accessibility and protection.
Solution Approach 2:
The inner mesh member acts as an intermediary structure that allows maintenance personnel to access the terminal while simultaneously serving as a protective barrier against foreign matter. The mesh structure provides both access functionality and protection.
2Device complexity
If a simple opening is used for rear access, then device complexity is reduced, but the filter member is susceptible to breakage from foreign matter
Solution Approach 1:
The protective structure is segmented into three distinct members: inner mesh member, filter member, and outer mesh member. This segmentation allows each component to be optimized for its specific function while collectively providing comprehensive protection without excessive complexity.
Solution Approach 2:
The outer mesh member serves as a preliminary protective barrier that absorbs and distributes impacts from foreign matter before they reach the filter member. This prior cushioning prevents direct damage to the filter member while maintaining overall structural simplicity.
3Productivity
If the filter member is placed directly in the opening for ventilation, then ventilation efficiency is improved, but the filter member is exposed to breakage from foreign matter
Solution Approach 1:
The ventilation opening is segmented into three functional layers that work together: the inner mesh member allows air passage while protecting the terminal, the filter member filters foreign matter, and the outer mesh member provides structural protection. This segmentation maintains ventilation efficiency while adding protective functionality.
Solution Approach 2:
Different portions of the opening structure have different local qualities optimized for specific functions: the inner mesh member has open structure for access, the filter member has filtering properties, and the outer mesh member has high structural strength. Each layer's local quality addresses specific requirements.
Data Source
AI summary
A fuel cell system mounted in a vehicle includes a stack case for housing a fuel cell stack. In the stack case, a rear opening is formed in a rear portion facing backward. A cell voltage detection terminal electrically connected to an electrode of the fuel cell stack is exposed in the rear opening. A multilayer filter is provided in the rear opening. The multilayer filter has an inner mesh member, a filter member, and an outer mesh member. An electrical equipment housing case for housing electrical equipment faces the rear opening.