Graphite Bipolar Plate Mesh Cooling for Thin Fuel Cell Stacks
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Solution Overview
Problem
Current bipolar plates in fuel cells suffer from issues such as high thickness, weight, susceptibility to damage, high cost, and uneven coolant distribution leading to unstable performance and channel blockage due to non-uniform heat exchange and coolant accumulation.
Innovation Solution
A fuel cell bipolar plate design featuring cathode and anode plates with oppositely arranged coolant flow channels, each with channel peaks and valleys, and the use of stiffeners to enhance structural integrity and uniform coolant distribution, combined with a three-dimensional mesh coolant chamber for efficient heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bipolar plate is made with sufficient thickness to meet coolant circulation requirements, then coolant flow is improved, but the overall length and weight of the stack cannot be reduced
Solution Approach 1:
The patent transitions from a traditional single-layer coolant channel design to a three-dimensional mesh coolant chamber structure. This spatial transformation allows coolant to flow through multiple pathways and dimensions, improving circulation efficiency without requiring increased plate thickness, thereby reducing overall stack weight.
Solution Approach 2:
The bipolar plate incorporates a porous structure with distributed coolant channels forming a mesh-like pattern. This porous architecture increases the surface area for heat exchange and provides multiple flow paths for coolant circulation, achieving effective cooling with thinner plates and reduced weight.
2Length of stationary object
If narrow cooling channels are used in the bipolar plate, then the plate thickness can be reduced, but pressure drop at inlets and outlets increases and coolant distribution becomes uneven
Solution Approach 1:
The patent employs a three-dimensional mesh coolant chamber that extends coolant flow paths in multiple spatial dimensions. This allows the use of narrower channels while maintaining adequate flow capacity by distributing coolant through numerous interconnected pathways, reducing pressure drop at inlets and outlets while keeping plate thickness reduced.
Solution Approach 2:
The coolant flow field is segmented into multiple narrow channels arranged in a mesh pattern throughout the bipolar plate. This segmentation distributes coolant flow across many small pathways, preventing excessive pressure drop at inlet/outlet while achieving effective cooling with thinner plate design.
3Device complexity
If coolant channels are arranged with different distances from inlets, then the plate structure can be simplified, but coolant distribution becomes uneven and heat exchange is non-uniform
Solution Approach 1:
The patent implements a mesh coolant chamber structure where local channel densities and orientations are optimized to achieve uniform coolant distribution throughout the plate. Different regions of the mesh structure have tailored characteristics that compensate for positional variations, ensuring consistent heat exchange performance across the entire bipolar plate surface.
Solution Approach 2:
The three-dimensional mesh structure provides additional spatial dimensions for coolant distribution, allowing uniform coverage to be achieved through vertical and lateral pathways rather than relying solely on horizontal channel spacing, thereby simplifying the overall arrangement while maintaining precision.
4Weight of moving object
If the bipolar plate is made thinner to reduce weight, then stack weight decreases, but structural strength and resistance to damage are reduced
Solution Approach 1:
The patent utilizes a porous structure with strategically designed mesh patterns that maintain structural integrity while reducing material usage. The interconnected porous network provides both mechanical strength and functional coolant flow paths, enabling thinner plates with adequate strength-to-weight ratio.
Solution Approach 2:
The bipolar plate employs composite construction combining conductive materials with reinforced mesh structures. This composite approach enhances structural strength and damage resistance in thinner plates while maintaining electrical conductivity and cooling functionality, thereby reducing stack weight without compromising durability.
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 achieves a thinner, lighter bipolar plate with improved structural strength, uniform coolant distribution, and enhanced heat exchange efficiency, preventing channel blockage and ensuring stable cell performance.
Implementation Method 1
the heat generated by a reaction cannot exchange with that of the coolant uniformly
Implementation Method 2
the coolant flows through the cooling channels
Data Source
AI summary
The present disclosure provides a fuel cell bipolar plate and a preparation method. The method includes: synchronously performing cathode flow field pre-rolling and anode flow field pre-rolling on both surfaces of a pair of flexible graphite coils; synchronously performing cathode flow field secondary rolling and anode flow field secondary rolling on both surfaces of the pre-rolled flexible graphite coils; cutting oxidant inlets/outlets, fuel inlets/outlets, and coolant inlets/outlets in the flexible graphite coils after secondary rolling, and cutting the flexible graphite coils into a bipolar plate shape to obtain a cathode plate and an anode plate; performing resin impregnating, cleaning, and curing on the cathode plate and the anode plate; oppositely arranging and bonding the cathode plate and the anode plate to form a fuel cell bipolar plate; synchronously fitting a cathode stiffener and an anode stiffener to obtain a finished fuel cell bipolar plate.