External Manifold Fuel Cell Stack with Adhesive Sealing
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Solution Overview
Problem
Conventional fuel cell stack designs face challenges such as high manufacturing costs, complex assembly processes, and reduced active area for electrochemical reactions due to the need for internal manifolds and sealing mechanisms, which also lead to issues like coolant permeation and external leaks.
Innovation Solution
The design incorporates a unitary plenum housing around the fuel cell stack periphery, with reductant and oxidant manifolds integrated into the stack, and a vapor barrier insert to reduce fluid egress, along with a method that eliminates the need for separate runner tubes and uses adhesive-based sealing to simplify manufacturing and increase active reaction area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If internal manifolds are used in fuel cell stacks, then sealing area is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the manifold function from internal stack components and relocates it to external manifolds positioned at the periphery of the stack. This eliminates the need for internal manifold structures and their associated sealing requirements, thereby maximizing the active area available for electrochemical reactions while reducing sealing complexity.
Solution Approach 2:
The patent transitions from a two-dimensional internal manifold arrangement to a three-dimensional external manifold configuration. The external manifolds are positioned outside the stack plane and connect to the stack through peripheral openings, utilizing spatial dimensions beyond the stack interior to achieve fluid distribution without compromising active area.
2Reliability
If gasket and compression-based sealing is used, then sealing is achieved, but sensitivity to thermal cycling and assembly complexity increase
Solution Approach 1:
The patent replaces the mechanical gasket and compression-based sealing system with an adhesive bonding system. The adhesive is applied to seal the peripheral openings and connect external manifolds to the stack, eliminating the need for gaskets, compression hardware, and associated tolerance requirements, while improving resistance to thermal cycling.
3Area of stationary object
If external manifolds are used, then active area is increased, but sealing between manifold and stack becomes more difficult
Solution Approach 1:
The patent replaces complex mechanical sealing interfaces with a simplified adhesive bonding process. The adhesive is applied directly to the peripheral openings and external manifold connection surfaces, creating a seal that is both reliable and easy to manufacture, eliminating the need for precision mechanical fitting and compression.
4Reliability
If traditional stack assembly with multiple components is used, then functional requirements are met, but manufacturing cost and time increase
Solution Approach 1:
The patent merges multiple separate components (manifolds, seals, and stack assembly) into an integrated configuration where external manifolds are directly bonded to the stack periphery using adhesive. This consolidation reduces the number of discrete parts, simplifies assembly steps, and improves manufacturing efficiency while maintaining all necessary functional requirements.
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 reduces manufacturing complexity, increases the active area for electrochemical reactions, minimizes coolant and fluid leaks, and lowers production costs by integrating manifolds and using adhesive sealing, resulting in a more reliable and efficient fuel cell stack.
Implementation Method 1
introducing a vapor barrier material around a periphery of the assembled fuel cell stack and components; and introducing an adhesive material that binds the external manifolds to the fuel cell stack and seals the peripheral openings
Implementation Method 2
introducing a vapor barrier material around a periphery of the assembled fuel cell stack and components
Data Source
AI summary
The present invention provides, among other things, membrane cassettes and stacks thereof which are suitable for a use in a variety of electrochemical applications. The invention further provides membrane cassettes which comprise one or more external manifolds which deliver reagents and/or coolant to one or more reactant or coolant flow fields of the membrane cassettes. In particular, the present invention describes the insert molding method, whereby the plenums of the external manifolds are created during the stack encapsulation step. The invention describes several methods for creating the manifold runner geometry via insert-molding, machining, or with separate components.