3D-Printed Polar Plates with Sintered Conductive Flow Structures
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Solution Overview
Problem
Existing methods for producing polar plates for fuel cells and redox flow batteries face challenges such as mechanical and thermal stresses, burrs, and low electrical and thermal conductance, particularly with traditional machining and 3D printing processes like FFF and FGF, which limit their efficiency and effectiveness.
Innovation Solution
A 3D printing process using a digital model to layer-by-layer apply a composite material, which includes metallic constituents and a binder, followed by debinding and sintering in a hydrogen or argon atmosphere, allowing for the creation of polar plates with optimized conductance and complex internal structures, enabling efficient energy conversion and fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional machining processes are used to produce polar plates, then manufacturing precision can be achieved, but mechanical stresses and burrs are generated that adversely affect stack connection
Solution Approach 1:
The patent replaces traditional mechanical machining processes with electrochemical etching. This substitution eliminates mechanical contact between cutting tools and the polar plate material, thereby preventing the generation of mechanical stresses and burrs while maintaining high dimensional accuracy through controlled electrochemical removal of material.
Solution Approach 2:
The patent changes the fundamental parameter of the manufacturing process from mechanical force-based removal to electrochemical reaction-based removal. By controlling electrical parameters (current density, voltage, electrolyte composition) instead of mechanical parameters (cutting force, tool geometry), the process achieves precision without mechanical damage.
2Object-affected harmful factors
If photochemical etching is used to produce polar plates, then mechanical stresses are avoided, but the process is limited to specific metal materials
Solution Approach 1:
The patent extends the material applicability by changing the fundamental mechanism from photochemical etching (which relies on light-sensitive coatings and specific metal reactivity) to electrochemical etching. This allows the process to work with diverse materials including stainless steels, titanium, and other metals that can serve as anodes in electrochemical reactions, significantly broadening material selection flexibility.
3Shape
If CNC machining is used to produce polar plates, then complex shapes can be achieved, but flatness is impaired and stresses are caused
Solution Approach 1:
The patent replaces mechanical CNC machining with electrochemical etching. The electrochemical process removes material uniformly through controlled anodic dissolution, maintaining the inherent flatness of the substrate while being capable of creating complex three-dimensional flow channel geometries through mask patterning and controlled etching rates.
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 process produces polar plates with high specific conductance and design flexibility, reducing material costs and mechanical stresses, enabling efficient energy conversion and fluid management, and allowing for complex internal structures that enhance the performance of fuel cells and redox flow batteries.
Implementation Method 1
The material used for printing is heated by the extruder until it liquefies or melts
Implementation Method 2
In debindering, a large part of the binder in the first stage is removed by catalytic decomposition, by thermal vaporization, decomposition or by solvent extraction
Implementation Method 3
sintering in a hydrogen or argon atmosphere
Data Source
AI summary
A process for producing a polar plate for fuel cells and/or redox flow batteries, comprising applying layers to produce a blank, wherein a composite formed of print material is printed layer-by-layer through a nozzle (extruder) using a fused filament fabrication (FFF) process or a fused granular fabrication (FGF) process and applied to a work plane to produce the blank of the polar, and sintering, wherein the blank of the polar plate is heated, with the temperatures during sintering remain below the melting temperature of the print material, so that the form (shape) of the workpiece is retained and to produce a finished polar plate.