Fuel Cell Stack Asymmetric Insulation for End-Cell Overheating
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Solution Overview
Problem
In fuel cell stacks, the end power generation cells tend to experience temperature decreases due to heat dissipation, leading to potential overheating issues, particularly at the second end power generation cell, which can affect the overall power generation performance.
Innovation Solution
The fuel cell stack design includes insulators with recesses for heat-insulating members and terminal plates, with a larger number of stacked layers in the heat-insulating members adjacent to the first end power generation cell and fewer layers adjacent to the second end power generation cell, along with a resin spacer and external coolant manifold to manage heat dissipation effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform heat-insulating members are used at both ends of the fuel cell stack, then the structure is simple and manufacturing is easy, but the second end power generation cell experiences overheating due to insufficient heat dissipation
Solution Approach 1:
The patent applies local quality by differentiating the heat-insulating member configuration between the first and second ends of the fuel cell stack. Specifically, the first end uses a heat-insulating member with a first number of stacked layers, while the second end uses a heat-insulating member with a second number of stacked layers that is different from the first number. This local differentiation allows optimized heat dissipation at the second end power generation cell, preventing overheating while maintaining manufacturing feasibility through a systematic variation rather than complete redesign.
Solution Approach 2:
The patent segments the heat-insulating members into distinct units with different stacked layer configurations at each end of the fuel cell stack. By dividing the heat management system into separable, configurable segments rather than a uniform continuous structure, the design enables independent optimization of heat dissipation at the second end while preserving the overall structural integrity and manufacturing simplicity of the stack assembly.
2Temperature
If heat dissipation is enhanced at the second end power generation cell, then overheating is prevented, but the structural symmetry and manufacturing uniformity are compromised
Solution Approach 1:
The patent implements local quality by introducing asymmetry only where thermally required - specifically at the second end power generation cell - while maintaining symmetry and uniformity in the majority of the stack structure. The heat-insulating members at the first end and intermediate cells remain uniform, creating a localized thermal management solution that minimizes overall structural complexity while effectively addressing the overheating issue at the critical second end cell.
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 design effectively suppresses overheating at the second end power generation cell by optimizing heat dissipation, maintaining high power generation performance with a simple and economical structure.
Implementation Method 1
insulators which are disposed on both sides of the stacked body in the stacking direction and have recesses in which heat-insulating members and terminal plates are accommodated
Data Source
AI summary
A fuel cell stack includes a stacked body, a first insulator and a second insulator. The stacked body includes power generation cells. The power generation cells are stacked in a stacking direction. The power generation cells include a first end power generation cell a second end power generation cell. Each of the power generation cells includes a membrane electrode assembly, a cathode separator and an anode separator. The first end power generation cell has an outermost cathode separator. The second end power generation cell has an outermost anode separator. The first insulator has a first recess in which a first heat-insulating body and a first terminal plate are accommodated. The second insulator has a second recess in which a second heat-insulating body and a second terminal plate are accommodated. A first number of first stacked heat-insulating layers is larger than a second number of second stacked heat-insulating layers.