Fuel Cell Module Oxidant Gas Distributor Heat Exchange Restraint
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Solution Overview
Problem
Fuel cell stacks experience temperature differences between central and end portions, leading to reduced electricity generation efficiency due to varying heat dissipation rates.
Innovation Solution
A fuel cell module design incorporating an oxidant gas distributing member with a heat exchange restraint portion and thermal insulation to regulate temperature distribution within the stack, using materials like ceramics for thermal insulation sheets to manage heat transfer and maintain uniform temperature across the fuel cell stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a plurality of unit cells are stacked to generate large electric power, then power output is improved, but temperature difference between central and end portions increases
Solution Approach 1:
The patent introduces a heat exchange restraint portion with different flow resistance characteristics at different locations of the oxidant gas distributing member. The first portion (facing central unit cells) has higher flow resistance to reduce heat exchange, while the second portion (facing end unit cells) has lower flow resistance to enhance heat exchange, creating local quality differences to balance temperature distribution across the stack.
2Ease of operation
If oxidant gas flows through the reactant gas distributing member to supply lower ends of unit cells, then fuel cell operation is enabled, but temperature distribution becomes non-uniform
Solution Approach 1:
The oxidant gas distributing member is designed with spatially varying flow resistance characteristics. The heat exchange restraint portion has higher flow resistance at the central region and lower flow resistance at the end regions, creating localized differences in heat exchange behavior that compensate for the non-uniform temperature distribution caused by standard gas flow.
3Temperature
If thermal insulation is added to reduce temperature difference, then temperature uniformity is improved, but device complexity increases
Solution Approach 1:
The oxidant gas distributing member performs multiple functions: it distributes oxidant gas to the unit cells and simultaneously acts as a heat exchange restraint portion with spatially varying flow resistance to balance temperature distribution. This multi-functionality avoids the need for separate insulation components, reducing device complexity while achieving temperature uniformity.
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 design effectively reduces temperature differences within the fuel cell stack, enhancing electricity generation efficiency by ensuring consistent heat dissipation and uniform temperature distribution.
Implementation Method 1
an insulating sheet, which restrains heat exchange between the oxidant gas and both the evaporation portion and an end of the unit cells
Implementation Method 2
heat exchange restraint portion that has a first portion facing a central portion of the fuel cell stack in the stack direction and having a first flow resistance, and a second portion facing an end portion of the fuel cell stack in the stack direction and having a second flow resistance
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A fuel cell module (200) includes: in a casing, a fuel cell stack (20) that is formed by stacking a plurality of unit cells (10); and an oxidant gas distributing member that is disposed at a side surface, that extends in a stack direction, of the fuel cell stack, that extends in a direction from one end to another end of each of the unit cells, and that supplies the oxidant gas along the oxidant gas distributing member from the one end to the another end to supply the oxidant gas to the another end of each unit cell. The oxidant gas distributing member includes a heat exchange restraint portion that restrains heat exchange between the unit cells and the oxidant gas in at least one of end portions of the fuel cell stack in the stack direction, in comparison with the heat exchange thereof in other portion in the fuel cell stack.