Fuel Cell Stack Assembly With Suction-Guided Separator Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cell stack assembly methods face difficulties in accurately stacking separators due to warping or undulation, which can lead to misalignment and catching by assembly shafts, making the process challenging and inefficient.
Innovation Solution
A method and apparatus for assembling a fuel cell stack using a suction-based system with a guide member and electronic control unit to precisely position and stack unitized electrode assemblies and separators, correcting warpage and undulation through controlled suction and descent, ensuring accurate alignment without free fall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the separator is stacked by free fall after releasing suction, then the stacking process is simple and fast, but the separator may warp or undulate causing misalignment and catching by assembly shafts
Solution Approach 1:
The separator is pre-positioned on the abutment member before stacking. The robot hand moves the separator to the abutment member, positions it correctly, and then releases it onto the target separator. This preliminary positioning action ensures alignment accuracy while maintaining efficient stacking.
Solution Approach 2:
The abutment member serves as an intermediary between the robot hand and the target separator. It provides a stable positioning surface that guides the separator into correct alignment during the stacking process, preventing warpage-induced misalignment while enabling controlled release.
2Manufacturing precision
If the separator is held by suction during stacking, then positioning accuracy is improved, but the suction force may cause deformation of the thin separator
Solution Approach 1:
The separator is positioned on the abutment member while under suction, allowing precise positioning. Once positioned correctly, the suction is released before the separator is fully stacked, preventing deformation from prolonged suction while maintaining positioning accuracy during the critical alignment phase.
Solution Approach 2:
The abutment member provides a cushioning support surface that distributes the suction force evenly across the separator. This prevents localized deformation while maintaining positioning accuracy, and the separator is transferred to the target before full stacking pressure is applied.
3Productivity
If the separator is released to drop by free fall, then the stacking process is fast, but misalignment occurs when the separator warps or undulates
Solution Approach 1:
The separator is pre-positioned on the abutment member with correct alignment before release. This preliminary positioning ensures that even when dropped by free fall, the separator maintains proper alignment and does not catch on assembly shafts, thereby maintaining both speed and reliability.
Solution Approach 2:
The abutment member acts as an intermediary that ensures correct positioning before free fall. It guides the separator into proper alignment and provides a controlled release point, making the free fall process reliable even for warped separators.
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 enables precise and accurate stacking of fuel cell components, preventing misalignment and catching issues, even with warped or undulated separators, thereby improving the assembly process and maintaining stack integrity.
Implementation Method 1
transporting the stack element above the predetermined region while sucking the stack element by a suction portion
Data Source
AI summary
An assembling method for a fuel cell stack including stacking alternately a unitized electrode assembly having an electrolyte membrane and an electrode, and a separator in a predetermined region to form a cell stacked body. Each of the unitized electrode assembly and the separator is a stack element, and the stacking includes transporting the stack element above the predetermined region while sucking the stack element by a suction portion, descending the stack element while positioning the stack element along a guide member extending upward around the predetermined region, and releasing a suction by the suction portion when a lower surface of the stack element abuts on an upper surface of another stack element having been stacked in the predetermined region.