Fuel Cell Separator Reinforcing Portion Manifold Deformation
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Solution Overview
Problem
The existing fuel cell separators suffer from deformation in the manifold portions during cell stacking, leading to deterioration in sealing performance due to low strength, which existing reinforcement techniques fail to adequately address.
Innovation Solution
Incorporating a reinforcing portion that extends from the manifold beam portions to the gap region between the power generation section and manifolds, which also functions as a cooling water guiding unit, helps suppress deformation and enhance sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manifold portions are designed with thinner walls to reduce weight and improve gas flow, then gas circulation efficiency is improved, but structural strength decreases causing deformation during stacking
Solution Approach 1:
The reinforcing portion extends in the thickness direction (third dimension) of the separator plate, adding structural support without increasing the planar footprint. This vertical reinforcement prevents deformation during stacking while maintaining the thin-wall design for efficient gas flow in the plane of the separator.
Solution Approach 2:
The separator employs a composite structure combining the base separator material with a reinforcing portion made of the same or similar material, creating a composite component that exhibits both the gas flow properties of the thin wall and the structural strength of the reinforced section.
2Reliability
If reinforcing portions are added to manifold beam portions to prevent deformation, then sealing performance is improved, but device complexity increases
Solution Approach 1:
The reinforcing portion is merged with the manifold beam portion, forming an integrated structure rather than a separate component. This consolidation provides the necessary reinforcement to prevent deformation and maintain sealing performance while avoiding the complexity of additional discrete parts and their associated assembly steps.
Solution Approach 2:
The reinforcing portion serves multiple functions: it strengthens the manifold beam portion to prevent deformation, maintains sealing performance between cells, and potentially guides cooling water flow. This multi-functionality reduces the need for separate components, thereby simplifying the overall device structure.
3Weight of moving object
If the separator plate is made thinner to reduce overall battery weight, then weight reduction is achieved, but the manifold portions become more prone to deformation under stacking loads
Solution Approach 1:
By adding the reinforcing portion that extends in the thickness direction, structural strength is enhanced without increasing the planar dimensions of the separator. This allows the separator to remain thin for weight reduction while the vertical reinforcement prevents deformation under stacking loads.
Solution Approach 2:
The composite structure of the thin-walled separator with integrated reinforcing portions creates a component that has both low weight and high strength-to-weight ratio, resolving the contradiction between weight reduction and deformation resistance.
Data Source
AI summary
A fuel cell separator 10 includes a power generation section 10B provided in a central region on a surface of the separator formed into a plate, a plurality of manifolds 11A, 11B, 12A, and 12B provided in a region closer to the outer periphery than the power generation section 10B, and a reinforcing portion 14A provided so as to extend from a manifold beam portion 15 formed between the plurality of manifolds 11A, 11B, 12A, and 12B to a gap region 13 formed between the power generation section 10B and the manifolds 11A, 11B, 12A, and 12B.