Fuel Cell Stack Separator Material Differentiation
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Solution Overview
Problem
Existing fuel cell stacks face corrosion issues at the positive-side end cells due to high potentials, leading to increased production costs and reduced productivity when using high-corrosion-resistant materials across all cells.
Innovation Solution
The fuel cell stack design differs in materials for end cells and other cells, using higher corrosion-resistant materials like Ti or noble metals for end cells, with a passivation film and optional surface protective layers to enhance corrosion resistance, reducing costs and maintaining productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high corrosion-resistant materials (noble metals, thick plating) are used for separators in all cells, then corrosion resistance is improved, but production cost increases and productivity decreases
Solution Approach 1:
The patent applies different material qualities to different locations: end cells (subject to high potential and corrosion) use high corrosion-resistant materials (noble metals or thick plating), while intermediate cells use standard materials. This localized quality differentiation resolves the contradiction by providing enhanced corrosion resistance only where needed, avoiding unnecessary cost and productivity loss across the entire stack.
2Reliability
If high corrosion-resistant materials are used for separators in end cells, then corrosion resistance is improved, but production cost increases
Solution Approach 1:
The patent implements local quality by restricting high corrosion-resistant materials to end cells only, rather than applying them uniformly across all cells. This reduces material costs while maintaining reliability where it matters most (at the corrosion-prone ends of the stack).
Solution Approach 2:
The patent segments the fuel cell stack into end cells and intermediate cells, applying different material specifications to each segment. This segmentation allows cost-effective material selection by matching material performance to actual operational requirements of each segment.
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 approach effectively prevents corrosion at the positive-side end cells without increasing production costs, allowing for a cost-effective and efficient fuel cell stack with enhanced corrosion resistance.
Implementation Method 1
the base material of each of separators used for an end cell located at a positive-side end of the fuel cell stack is a material with higher corrosion resistance than the base material of each of separators used for cells other than the end cell
Data Source
AI summary
Provided is a fuel cell stack including a plurality of stacked cells each having separators, in which the corrosion (dissolution) of the base material of each separator used for the end cell, which includes one or more cells located at the positive-side end of the fuel cell stack, can be prevented at low cost and without the productivity decreased. In the fuel cell stack including a plurality of stacked cells each having separators, the base material of each of the separators used for the end cell located at the positive-side end of the fuel cell stack and the base material of each of the separators used for the other cells are different metallic materials, and the base material (e.g., Ti) of each of the separators used for the end cell has higher corrosion resistance than the base material (e.g., SUS) of each of the separators used for the other cells.