Fuel Cell End-Plate Elastic Member for Freezing Condensate
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Solution Overview
Problem
Fuel cells experience irreversible plastic deformation and performance deterioration due to the expansion of condensate water freezing in low temperatures, which increases contact pressure and damages the gas diffusion layers and separation plates.
Innovation Solution
Incorporating an elastic member within the end-plates of the fuel cell, specifically designed to absorb and offset the expansion force of condensate water, maintaining constant contact pressure and preventing damage to the cell components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If condensate water remains in the unit cells during low temperature operation, then the fuel cell can continue to operate in cold environments, but the expansion of frozen water increases contact pressure causing irreversible plastic deformation of the gas diffusion layer and separation plate
Solution Approach 1:
The elastic member is installed in advance within the end-plate to provide cushioning protection. When condensate water freezes and expands, the elastic member absorbs the expansion force through elastic deformation, preventing the formation of excessive contact pressure that would cause plastic deformation of the gas diffusion layer and separation plate. This beforehand cushioning mechanism ensures the fuel cell can operate in cold environments without structural damage.
Solution Approach 2:
The elastic member changes its physical parameters (elastic modulus, stiffness) to match the expansion characteristics of frozen water. By selecting appropriate material parameters for the elastic member, it can effectively absorb the expansion force of frozen condensate water while maintaining sufficient contact pressure for normal operation, thus resolving the contradiction between cold environment adaptability and structural reliability.
2Reliability
If the contact pressure increases due to frozen water expansion, then the sealing may be improved, but the gas diffusion layer and separation plate suffer irreversible plastic deformation
Solution Approach 1:
The elastic member acts as a flexible element that can deform under load. It maintains adequate contact pressure for sealing by flexing, while simultaneously limiting the maximum pressure to prevent plastic deformation of the rigid components (gas diffusion layer and separation plate). This flexible buffering mechanism resolves the contradiction between maintaining sealing and protecting structural strength.
3Reliability
If an elastic member is added to offset expansion force, then damage to components is prevented, but the device complexity increases
Solution Approach 1:
The elastic member is integrated into the existing end-plate structure, serving multiple functions: it cushions expansion force from frozen water, maintains contact pressure for sealing, and protects the gas diffusion layer and separation plate from deformation. By making this single component multi-functional, the solution improves reliability without proportionally increasing device complexity.
Solution Approach 2:
The elastic member is nested within the end-plate structure, utilizing the existing space and structural framework. This nesting approach allows the addition of the protective function without requiring separate external components or significantly increasing the overall device complexity, as the elastic member is incorporated into the existing end-plate design.
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 elastic member effectively prevents damage to the gas diffusion layers and separation plates, enhancing the performance and durability of the fuel cell by maintaining consistent contact pressure and minimizing structural deterioration.
Implementation Method 1
an elastic member overlapped with a lower area of the cell stack in which condensate water remains in the first direction, at least a portion of the elastic member being disposed within the end-plate
Data Source
AI summary
A fuel cell having an elastic member is provided. The fuel cell includes a cell stack in which a plurality of unit cells are stacked in a first direction and an end-plate disposed on each of opposite side ends of the cell stack. The elastic member is disposed in a portion of the end-plate to overlap a lower area of the cell stack in which condensate water remains in the first direction.