Fuel Cell Separator Surface Roughening via Plastic Deformation
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Solution Overview
Problem
Existing methods for producing fuel cell separators, such as etching and abrasive blasting, generate waste and require complex operations, and do not effectively reduce contact resistance between the separator and its counterpart members.
Innovation Solution
A method involving the plastic deformation of sheet-like metal substrates by pulling them in one direction to increase the arithmetic average roughness of their surfaces, thereby enhancing the contact area rate and reducing contact resistance, without generating waste or requiring complex operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If etching process is performed on metal substrate to roughen the surface, then contact area between separator and counterpart member is increased, but large quantity of waste liquid is generated requiring waste liquid treatment
Solution Approach 1:
The patent replaces the chemical etching process with a mechanical rolling process. The metal substrate is passed through rollers that mechanically deform the surface to create roughness, eliminating the need for chemical etchants and waste liquid treatment while achieving the same surface roughness effect.
Solution Approach 2:
The patent changes the method of surface treatment from chemical parameter changes (etching solutions) to mechanical parameter changes (roller pressure, speed, and surface texture). By controlling the mechanical rolling parameters, the desired surface roughness is achieved without generating harmful waste liquid.
2Manufacturing precision
If abrasive blasting is performed on metal substrate to roughen the surface, then contact area between separator and counterpart member is increased, but complex operations are required as polishing agent should be uniformly blasted onto the surface
Solution Approach 1:
The patent replaces the complex abrasive blasting operation with a simpler mechanical rolling process. The continuous rolling through textured rollers provides uniform surface roughness without the need for complex blasting equipment, polishing agent preparation, or uniform application control.
Solution Approach 2:
The rolling process is a self-contained operation where the rollers themselves provide the roughening surface through their own texture. The metal substrate passes through and receives the treatment automatically without requiring separate polishing agent application, making the process simpler and more self-service oriented.
3Reliability
If metal substrate is pulled to plastically deform and increase surface roughness, then contact resistance is reduced, but the metal substrate undergoes permanent deformation
Solution Approach 1:
The patent applies plastic deformation locally only to the surface layer of the metal substrate through rolling. The bulk material retains its original shape and properties, while only the surface acquires the desired roughness for reduced contact resistance. This localized quality change resolves the contradiction between improving contact resistance and maintaining overall substrate shape.
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 method effectively reduces contact resistance between the fuel cell separator and its counterpart members by increasing the surface roughness and contact area, while eliminating waste generation and operational complexities.
Implementation Method 1
pulling the metal substrate at least in one direction to plastically deform the metal substrate
Data Source
AI summary
Provided is a method for producing a fuel cell separator, capable of easily roughening the surface of a sheet-like metal substrate to become a fuel cell separator and thus reducing the contact resistance of the resulting fuel cell separator. Specifically, the method is a method for producing a fuel cell separator from a sheet-like metal substrate, including pulling the metal substrate at least in one direction to plastically deform the metal substrate, thereby increasing the arithmetic average roughness Ra of the surface of the metal substrate after being pulled compared to that before being pulled.