Fuel cell separator manufacturing method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional manufacturing of stainless-steel fuel cell separators faces challenges of high additional cost and the need for improved conductivity at the initial stage of fuel cell operation.
Innovation Solution
A manufacturing method involving immersion of a stainless-steel base material in an acidic solution with a fluorine ion concentration of 0.1 ppm or higher and a pH of 1±0.2 at 80° C.±5° C. for 60 minutes or longer to enhance conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface treatment such as plating with carbon or gold is performed to improve conductivity, then conductivity is improved, but additional cost is incurred
Solution Approach 1:
The invention changes the chemical composition parameters of the stainless steel base material itself by adding specific alloying elements (Ni: 5-20 wt%, Cr: 15-30 wt%, Mn: 2-10 wt%, Mo: 1-5 wt%) to achieve high conductivity without surface treatment. This modifies the fundamental properties of the material to reduce contact resistance from the bulk material rather than adding a conductive coating layer.
2Ease of manufacture
If a surface treatment is performed on only one surface to reduce cost, then additional cost is reduced, but contact resistance on the other surface becomes high
Solution Approach 1:
The invention achieves uniform high conductivity throughout the entire separator by modifying the base material composition. The alloying elements are distributed uniformly in the stainless steel structure, ensuring that both surfaces and the bulk material have inherently low contact resistance, eliminating the need for selective surface treatment.
3Reliability
If complicated processing is performed to impart sufficient conductivity, then conductivity is improved, but process complexity increases
Solution Approach 1:
The invention simplifies the manufacturing process by achieving high conductivity through material composition control rather than complex surface treatment processes. The specified alloying element ranges ensure adequate conductivity is built into the base material during steelmaking, eliminating or reducing the need for subsequent plating, coating, or other complex conductivity-enhancement processes.
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 method effectively imparts high conductivity to the stainless-steel fuel cell separators at a low cost, reducing contact resistance and enhancing power generation performance.
Implementation Method 1
immersing a stainless-steel base material formed into a shape of a separator in an acidic solution having a fluorine ion concentration of 0.1 ppm or higher and a pH of 1±0.2 at 80° C.±5° C. for 60 minutes or longer to perform a modification treatment on a surface of the stainless-steel base material
Data Source
AI summary
The present disclosure relates to a fuel cell separator manufacturing method involving immersing a stainless-steel base material formed into a shape of a separator in an acidic solution having a fluorine ion concentration of 0.1 ppm or higher and a pH of 1±0.2 at 80° C.±5° C. for 60 minutes or longer to perform a modification treatment on a surface of the stainless-steel base material.