Carbon Fiber Separator Plate With Low Resistance and Thin Walls
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Solution Overview
Problem
Existing separator plates in PEM fuel cells and redox flow batteries face challenges with corrosion in metal plates and mechanical instability in carbon-based plates, leading to high costs and inefficiencies due to thick wall thicknesses, which affect construction volume, weight, and material usage.
Innovation Solution
A monolayer carbon fibre-reinforced carbon separator plate with a duromer resin and a continuous electrically conductive network, achieving a thickness of less than 0.5 mm and tensile strength greater than 30 MPa, while maintaining low volume resistance and density, is developed. This is achieved through a production method involving carbon fibre textiles, duromer resins, and strategically dispersed fillers, ensuring mechanical stability and efficient conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wall thickness of separator plates is increased to improve mechanical stability, then the mechanical strength increases, but the volume resistance increases significantly and construction volume increases
Solution Approach 1:
The separator plate uses a composite structure combining carbon fiber-reinforced carbon with duromer resin impregnation. The carbon fibers (0.5-2 mm length) are embedded in a carbon matrix and impregnated with duromer resin, creating a composite material that achieves high mechanical strength (tensile strength >30 MPa) at reduced thickness (0.3-0.5 mm) while maintaining low volume resistance (<8 mΩcm²).
Solution Approach 2:
The invention changes the material parameters by using short carbon fibers (0.5-2 mm) instead of continuous fibers, and impregnating with duromer resin to achieve optimal balance between mechanical strength and electrical conductivity. The fiber length, resin type, and curing conditions are optimized to achieve tensile strength >30 MPa at thickness 0.3-0.5 mm with volume resistance <8 mΩcm².
2Strength
If the wall thickness of separator plates is increased to improve mechanical stability, then the mechanical strength increases, but the construction volume and weight increase
Solution Approach 1:
The composite structure of carbon fiber-reinforced carbon impregnated with duromer resin enables high mechanical strength at reduced thickness. The carbon fibers provide tensile strength (>30 MPa), the carbon matrix provides structural integrity, and the duromer resin provides binding and additional mechanical stability, allowing separator plates of 0.3-0.5 mm thickness to achieve adequate mechanical stability without excessive volume.
Solution Approach 2:
The invention successfully implements a thin film separator plate (0.3-0.5 mm thickness) that maintains adequate mechanical stability through the composite structure. The thin design reduces construction volume while the carbon fiber reinforcement and duromer resin impregnation ensure the plate can withstand operational mechanical loads.
3Quantity of substance
If carbon fibre paper is used with high porosity to maintain permeability, then the permeability increases, but the mechanical stability decreases
Solution Approach 1:
The invention creates a composite material combining carbon fiber-reinforced carbon with duromer resin. The carbon fiber network maintains porosity and permeability for gas transport, while the duromer resin impregnation binds the fibers together, significantly improving mechanical stability (tensile strength >30 MPa) without blocking the pores that enable permeability.
Solution Approach 2:
The duromer resin is selectively impregnated into the carbon fiber structure, providing localized reinforcement at fiber intersections and contact points while leaving the pore channels open for gas transport. This local quality enhancement maintains permeability while improving mechanical stability where needed.
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 solution results in a mechanically stable, lightweight separator plate with reduced volume resistance and improved conductivity, enhancing the efficiency and reducing costs by minimizing material usage and construction volume, thus addressing the inefficiencies of previous technologies.
Implementation Method 1
a monolayer of carbon fibre-reinforced carbon impregnated with a duromer resin
Implementation Method 2
carbon binder bridges between the carbon fibres. This allows for a particularly thin and high-tensile separator plate due to the fibre reinforcement with a conductivity which is still good due to the carbon binder bridges between the carbon fibres, which creates a continuous electrical conductivity network.
Data Source
AI summary
A separator plate, a method for producing the separator plate and its use.