Fuel Cell Array Inspection via Parallel Switching
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Solution Overview
Problem
The challenge is to reduce the failure rate and manufacturing costs of fuel cell modules by detecting short-circuit failures in fuel cells manufactured using a thin-film deposition process, where the thinning of the solid electrolyte layer increases the probability of short-circuit failures between electrodes, leading to reduced yield and increased costs.
Innovation Solution
A fuel cell array configuration where a selection switch, such as a threshold switch, diode, or field effect transistor, is used to isolate each fuel cell, allowing for simultaneous inspection and identification of short-circuit failures, thereby reducing the number of defective cells in the module and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual fuel cells are wired separately to inspect each cell for short-circuit failures, then detection accuracy improves, but the number of inspections required increases and manufacturing cost increases
Solution Approach 1:
The patent merges multiple individual cell inspections into a single array-level inspection process. By connecting all fuel cells in parallel within the array and applying a unified voltage measurement method across the entire array, the system can detect short-circuit failures in multiple cells simultaneously through a single inspection operation, thereby maintaining high detection accuracy while significantly improving manufacturing efficiency
Solution Approach 2:
The inspection method described in the patent is universal and can be applied to fuel cell arrays of various sizes and configurations. The same voltage measurement technique works whether inspecting a small array of a few cells or a large array with many cells, making the inspection process adaptable and efficient across different production scales without requiring separate specialized procedures for each cell
Data Source
AI summary
The present invention aims to reduce a failure in a fuel cell module and reduce manufacturing costs by specifying and taking countermeasures against cells in short-circuit failure from among fuel cells manufactured on a substrate by using a thin-film deposition process. In a fuel cell array according to the present invention, each fuel cell includes a solid electrolyte layer between a first electrode layer and a second electrode layer. A first wiring is connected to the second electrode layer, and a second wiring is connected to the first electrode layer through a connection element. The connection element is formed by sandwiching a conductive layer between two electrodes (refer to FIG. 8).