Fuel Cell Manifold Segmentation via Bipolar Plate Wall
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Solution Overview
Problem
Existing fuel cell systems face complexity and increased component count when attempting to alternate or simultaneously supply reactants to groups of cells, often requiring cumbersome structures or varying seal thicknesses.
Innovation Solution
A fuel cell design featuring a stack of elementary cells separated by bipolar plates, where at least one bipolar plate remains uncut to divide the supply manifold into portions, allowing for alternate or simultaneous supply of reactants without modifying the stack's joints or increasing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate stacks are physically produced with two groups of cells mounted on either side of a central support plate, then alternate supply of two groups of cells is achieved, but the structure becomes cumbersome and device complexity increases
Solution Approach 1:
The patent merges two separate stack structures into a single unified stack by using a common bipolar plate that is divided into two portions. This allows two groups of cells to be mounted on the same support plate structure, eliminating the need for separate central support plates and reducing overall structural complexity while maintaining alternate supply capability
2Adaptability or versatility
If seals of different thicknesses are used to accommodate varying cell configurations, then alternate supply is enabled, but the number of components increases and manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by creating two portions of the bipolar plate with different characteristics - one portion remains intact while the other is cut away. This localized modification allows the seal to maintain uniform thickness throughout, as each section is designed with its specific function in mind, eliminating the need for variable thickness seals and simplifying manufacturing
3Ease of operation
If the supply manifold is divided into separate components to supply two groups of cells alternately, then control flexibility is improved, but device complexity and component count increase
Solution Approach 1:
The patent segments the bipolar plate into two portions - an intact portion and a cut-away portion - which naturally divides the supply manifold into two separate pathways. This segmentation is achieved through the plate geometry itself rather than adding separate manifold components, maintaining control flexibility while reducing overall device complexity
Data Source
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AI summary
Fuel cell comprising a stack of elementary cells (C) and bipolar plates (2), each elementary cell (C) defining, with the bipolar plates (2) on either side of it, an anodic compartment and a cathodic compartment, a first manifold supplying hydrogen to the anodic compartments, a second manifold supplying air to the cathodic compartments, and a manifold for removing reaction by-products. The first manifold has two ends (10.1, 10.2) configured to be connected to a hydrogen source and is delimited by windows cut into the bipolar plates and the elementary cells, wherein said first power collector (10) is divided into two portions (P1, P2) by a wall formed by a bipolar plate not having said window, and wherein said stack has control means configured to separately control the power supply to the first and second ends of the first collector.