Fuel Cell Adhesive Application Timing to Limit Spread
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Solution Overview
Problem
In fuel cell manufacturing, adhesive application to gas diffusion layers results in unwanted spread to inapplicable regions, affecting internal resistance and sealability due to inaccurate control of adhesive application.
Innovation Solution
An adhesive application system using a controller to control a valve and robot arm, applying adhesive in a controlled manner, either as a solid line or intermittently, to minimize spread by reducing liquid accumulation and width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied in the form of a line to bond gas diffusion layer to intermediate layer, then bonding is achieved, but adhesive spreads to inapplicable regions (electrode region and seal region vicinity) causing harmful effects
Solution Approach 1:
The valve is opened before the applier reaches the position immediately above the application start point. This preliminary action allows the adhesive to be dispensed in advance of the applier's position, creating a controlled liquid accumulation that prevents unwanted spread to inapplicable regions while ensuring proper bonding in the target area.
2Object-affected harmful factors
If adhesive application region is controlled with high accuracy to prevent spread, then harmful effects are reduced, but application precision requirements increase
Solution Approach 1:
By opening the valve before reaching the application start point, the system proactively controls adhesive flow to prevent spread issues before they occur. This preliminary control mechanism reduces the need for extremely tight application precision during the main bonding process.
Solution Approach 2:
The system changes the timing parameter of valve operation relative to applier position. Instead of opening the valve only when directly above the application point, it opens the valve at a predetermined earlier position, fundamentally changing the adhesive flow dynamics to prevent spread.
3Manufacturing precision
If valve is opened before applier reaches position above application start point, then liquid accumulation at application start point is reduced, but control complexity increases
Solution Approach 1:
The controller monitors the applier's position and valve state, and adjusts valve timing based on the applier's actual position and speed. This feedback mechanism allows the system to dynamically optimize the valve opening timing to achieve precise adhesive application while compensating for variations in motion.
Solution Approach 2:
The controller is configured with predetermined timing information to open the valve at the correct position before the application start point. This preliminary control action simplifies the overall control strategy by establishing a fixed timing relationship between valve operation and applier position.
Data Source
AI summary
An adhesive application system applies an adhesive to an intermediate layer at a stage of manufacturing a fuel cell including the intermediate layer and gas diffusion layers on both sides thereof. The adhesive application system includes an applier, a robot arm, and a controller. The applier applies the adhesive when a valve is opened. The robot arm is capable of moving the applier. The controller controls the valve and the robot arm. The controller opens the valve before the applier reaches a position immediately above an application start point while moving the applier by the robot arm, thereby applying the adhesive in the form of a line to the intermediate layer from the application start point.