Fuel Cell Stack Airtightness Detection via Movable Intake
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Solution Overview
Problem
Current methods for testing the airtightness of fuel cell stacks are time-consuming, complex, and often damage normal cells during the disassembly process, making it difficult to accurately identify airtightness-defective cells within the stack.
Innovation Solution
A device and method that utilize a detection gas supplier, intake system, and detection gas concentration detector to identify airtightness-defective cells within a fuel cell stack without disassembly, using a dual-pipe intake system and servo motor to move the intake in the sequential stacking direction, allowing for accurate detection of gas leaks and localization of defective cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fuel cell stack is disassembled to test airtightness of individual cells, then the airtightness of each cell can be tested, but the testing time increases significantly and normal cells may be damaged
Solution Approach 1:
The patent applies segmentation by moving the detection intake to different positions corresponding to individual fuel cells sequentially. The controller controls the intake to be located at each fuel cell position in turn, allowing individual cell detection without physical disassembly. This resolves the contradiction by enabling precise individual cell measurement while maintaining the stack's intact state, thus avoiding time loss from disassembly.
Solution Approach 2:
The patent employs dynamics by making the detection intake movable rather than fixed. The intake can be dynamically repositioned to different fuel cell locations under controller management. This dynamic capability allows the system to test each cell sequentially without disassembling the stack, thereby achieving both measurement precision and time efficiency.
2Measurement precision
If a fuel cell stack is disassembled to locate airtightness-defective cells, then defective cells can be identified, but the overall process becomes complicated and normal cells may be damaged
Solution Approach 1:
The patent segments the detection process by having the intake visit each fuel cell position sequentially under controller management. This allows defective cells to be identified individually while the stack remains assembled, simplifying the overall process and eliminating the complexity of physical disassembly and reassembly operations.
Solution Approach 2:
The system performs self-service by automatically controlling the intake movement and detection process without requiring manual disassembly operations. The controller manages the entire testing sequence, reducing process complexity and eliminating human error associated with manual disassembly and reassembly of the fuel cell stack.
3Productivity
If detection gas is supplied to all fuel cells simultaneously, then testing can be performed on the entire stack, but it is impossible to locate which specific cell is defective
Solution Approach 1:
The patent segments the detection process spatially and temporally by having the intake visit each fuel cell position sequentially. The controller manages the intake to be located at each cell in turn, allowing the system to maintain high productivity through continuous operation while preventing information loss about defective cell locations through systematic positional tracking and recording.
Solution Approach 2:
The system implements feedback by continuously monitoring detection gas concentration at each fuel cell position and recording the results with corresponding positional information. The controller uses this feedback to identify which specific cell shows abnormal detection values, thereby maintaining both testing efficiency and complete location information for defective cells.
4Strength
If the fuel cell stack remains assembled during testing, then disassembly damage is avoided, but the ability to test individual cells is reduced
Solution Approach 1:
The patent applies dynamics by making the detection intake movable while keeping the fuel cell stack statically assembled. The intake can be dynamically repositioned to each cell location without disassembling the stack, thereby maintaining fuel cell integrity while achieving precise individual cell testing capability through the movable detection system.
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
This approach significantly reduces the time required for airtightness testing, enhances detection accuracy, and prevents damage to fuel cells by allowing for precise identification of airtightness-defective cells within the stack without disassembly, thereby improving the convenience and efficiency of the testing process.
Implementation Method 1
a detection gas concentration detector intaking the detection gas through the intake and detecting a concentration of the detection gas
Data Source
AI summary
Disclosed is a device for testing airtightness of a fuel cell stack. The device for testing airtightness of a fuel cell stack including a first reaction gas inflow portion and a first reaction gas outflow portion which a first reaction gas flows in or out, respectively, and a second reaction gas inflow portion and a second reaction gas outflow portion which a second reaction gas flows in and out, respectively, includes i) a detection gas supplier supplying a detection gas to the first reaction gas inflow portion, ii) an intake installed to be movable in a sequential stacking direction of fuel cells in the second reaction gas outflow portion, iii) a detection gas concentration detector intaking a detection gas through the intake and detecting a concentration of the detection gas, and iv) a controller determining an airtightness-defective cell based on a position of the intake by analyzing the detected concentration value of the detection gas detected by the detection gas concentration detector.