Fuel Cell Stack Insulation Plate Sealing for Easier Assembly
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Solution Overview
Problem
The manufacture and assembly of fuel cell stacks are costly and labor-intensive due to the need for precise positioning and numerous components to ensure hermetic sealing, which complicates the process and increases costs.
Innovation Solution
A fuel cell stack design featuring insulation plates with integrated ducts and sealing elements that allow for easy assembly by compressing the sealing elements in the stacking direction, eliminating the need for precise component positioning and reducing the number of components, while ensuring effective sealing against external contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow tolerances and precise positioning are used to ensure hermetic sealing, then sealing reliability is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent employs flexible sealing elements (gaskets) made of elastomeric materials that can deform to accommodate manufacturing tolerances and ensure hermetic sealing between rigid components like the fuel cell stack body, terminal plates, and end plates. This flexibility compensates for dimensional variations without requiring tight tolerances on the mating surfaces.
Solution Approach 2:
The patent introduces insulation plates as intermediary components between the terminal plates and end plates. These insulation plates serve multiple functions: electrical insulation to prevent current leakage, structural support, and sealing surfaces for the gaskets. By adding this intermediary layer, the design decouples the sealing requirement from the electrical connection requirement, allowing independent optimization of both functions.
2Reliability
If multiple components and precise positioning are used to ensure hermetic sealing, then sealing reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions into integrated components. The insulation plates are designed with built-in sealing surfaces and structural features that eliminate the need for separate sealing components in certain locations. The terminal plates integrate both electrical conduction paths and sealing surfaces, reducing the total component count while maintaining hermetic sealing through the use of gaskets at critical interfaces.
Solution Approach 2:
The end plates are designed as multi-functional components that serve as structural closures, electrical insulation barriers, and mounting surfaces for sealing elements. The same components provide both mechanical support and sealing functions, reducing the need for additional specialized parts and simplifying the overall assembly.
3Ease of operation
If insulation plates with integrated ducts are used, then assembly ease is improved, but component complexity increases
Solution Approach 1:
The insulation plates are designed with coolant ducts and flow fields directly integrated into their structure. This merging of insulation and fluid distribution functions into a single component eliminates the need for separate manifolds or channels, simplifying the assembly process while the internal complexity of the duct network is managed through intelligent design rather than additional external components.
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
The design facilitates efficient and cost-effective assembly with improved sealing, reducing the risk of fluid ingress and maintaining a hermetic environment without precise component alignment, thus simplifying the manufacturing process and lowering costs.
Implementation Method 1
allow for easy assembly by compressing the sealing elements in the stacking direction
Implementation Method 2
compressing the at least one sealing element in the stacking direction
Implementation Method 3
the insulation plates are adapted to electrically insulate the terminal plates from the end plates
Implementation Method 4
The manifolds may form respective tubelike channels extending through the fuel cell stack body for providing the respective streams to and from the fuel cell stack
Data Source
AI summary
A fuel cell stack includes at least a fuel cell stack body with a plurality of unit fuel cells, wherein each unit fuel cell includes a bipolar plate and a membrane electrode assembly, which are alternatingly stacked in a stacking direction, a first and second terminal plate sandwiching the fuel cell stack body, wherein the first and second terminal plate are adapted to collect the electric energy generated by the fuel cell stack body, a first insulation plate and a second insulation plate sandwiching the terminal plates, wherein the insulation plates are adapted to electrically insulate the terminal plates, and a first and second end plate sandwiching the insulation plates, wherein at least one first sealing element is arranged between at least one insulation plate and the adjacent end plate.