Fuel Cell Separator Airtightness Testing Jig
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Solution Overview
Problem
Conventional methods for testing the airtightness of fuel cell separators are inefficient in identifying leakage points, especially for internal airtightness lines not exposed externally, and can degrade the quality of unit cells during disassembly and re-fastening.
Innovation Solution
An apparatus with a jig unit and test solution supply means that allows for pre-lamination testing of airtightness lines by using a test flow field and a color test solution to visually identify leaks, preventing contamination and quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional airtightness testing methods using inert gas are used after stack lamination, then it is possible to determine whether airtightness is leaked, but it is very difficult to track the leakage location
Solution Approach 1:
The airtightness line is divided into multiple test regions (first test region, second test region, third test region) corresponding to different functional areas (inflow manifold, reaction surface, discharge manifold). By segmenting the testing area and using multiple jigs with specific flow fields, the patent enables precise identification of which specific region has the leakage, transforming a general airtightness test into a localized diagnostic tool.
Solution Approach 2:
A test solution (colored liquid) is introduced as an intermediary medium to visualize the leakage location. When the test solution contacts the leakage point, it creates a visible trace that precisely indicates where the airtightness failure occurs. This intermediary substance bridges the gap between detecting airtightness failure and locating the exact leakage point.
2Manufacturing precision
If the fuel cell stack is disassembled and re-fastened for quality checking, then component quality can be inspected, but the quality of the component of each unit cell is degraded
Solution Approach 1:
The airtightness test is performed on the separator before the unit cells are assembled into the fuel cell stack. By conducting the test in advance on individual separators using the jig unit, the patent eliminates the need to disassemble and re-fasten the completed stack for quality inspection, thereby preventing quality degradation from repeated mechanical operations.
3Reliability
If internal airtightness lines are tested after stack assembly, then airtightness can be verified, but it is difficult to confirm the leakage point since internal airtightness lines are not exposed to the outside
Solution Approach 1:
The test solution serves as an intermediary that can access internal airtightness lines through the flow field of the jig unit. The colored liquid travels through the internal channels and emerges at the leakage point, making invisible internal leaks visible without requiring direct visual access to the internal airtightness lines.
Solution Approach 2:
The patent replaces visual inspection methods with a fluid-based detection system. Instead of trying to visually locate leakage points in internal channels, the system uses the flow and movement of test solution to reveal leakage locations, substituting mechanical/visual detection with fluid dynamics-based detection.
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
Enables precise identification of airtightness line failures before stack lamination, preventing component quality degradation and contamination, and facilitating early corrective actions.
Implementation Method 1
a test solution supply means for supplying a test solution to a contact location at which the airtightness line of the separator and the jig unit contact to each other through the test flow field of the jig unit
Data Source
AI summary
An apparatus for testing the airtightness of a separator for a fuel cell includes: a jig unit being in close contact with a surface of the separator on which an airtightness line is formed, and having a test flow field formed thereon, the test flow field being opened to a location contacting the airtightness line of the separator; and a test solution supply means for supplying a test solution to a contact location at which the airtightness line of the separator and the jig unit contact to each other through the test flow field of the jig unit, such that a leakage of the test solution at the contact location is tested.