Fuel Cell Stack Heat Insulating Section Design
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Solution Overview
Problem
Existing fuel cell systems face challenges with large size, high air pressure requirements, non-uniform temperature distribution, and increased heat stress due to the placement of reformers and heat exchangers, which affect power generation efficiency and overall system compactness.
Innovation Solution
A fuel cell stack design featuring a compact structure with a heat insulating section and a reactant gas supply system that includes a bridge and sandwiching sections to manage heat radiation and stress, allowing for efficient power generation and current collection while reducing the overall size and improving assembling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If reformers and heat exchangers are placed inside the heat insulating housing to enable fuel reforming and heat exchange, then the fuel cell system can achieve fuel utilization and temperature control, but the overall size of the fuel cell system becomes considerably large
Solution Approach 1:
The patent extracts the reformer and heat exchanger from the heat insulating housing, placing them outside the housing instead of inside. This separation allows the fuel cell stack to be compact while the reforming and heat exchange functions are performed in external components, thus reducing the overall size of the fuel cell system while maintaining fuel utilization capabilities.
Solution Approach 2:
The system is divided into distinct functional modules: the fuel cell stack housed in a heat insulating housing, and the reformer/heat exchanger as separate external components. This segmentation allows each component to be optimized independently and reduces the total volume required for the complete system.
2Volume of stationary object
If the space between the heat insulating member and the fuel cell stack is minimized to reduce the overall size, then the system becomes more compact, but the temperature of the fuel cell stack decreases locally due to heat absorbing reforming reactions, resulting in non-uniform temperature distribution
Solution Approach 1:
The heat exchanger is extracted and placed outside the heat insulating housing, positioned to receive exhaust gas from the fuel cell stack. This external placement allows it to function as a thermal management component without occupying space within the housing, maintaining compact dimensions while providing heat recovery to support uniform temperature distribution.
Solution Approach 2:
The heat exchanger acts as an intermediary thermal management component that receives exhaust gas from the fuel cell stack and facilitates heat exchange. This mediator helps maintain uniform temperature distribution by recovering and redistributing thermal energy without requiring internal space for its operation.
3Reliability
If fuel cell stacks are placed considerably away from each other in the stack case, then each stack has sufficient space for operation, but the overall size of the fuel cell system becomes considerably large
Solution Approach 1:
Multiple fuel cell stacks are merged into a single integrated fuel cell system with common external components (reformer, heat exchanger, control unit). This combining approach allows the stacks to be arranged compactly within the housing while sharing external infrastructure, reducing the overall system size while maintaining operational stability through proper thermal and fluid management.
Solution Approach 2:
The external components (reformer, heat exchanger, oxygen-containing gas supply device) are designed as universal multi-functional units that serve all fuel cell stacks simultaneously. This multi-functionality reduces the total number of components needed and allows compact arrangement of multiple stacks without requiring duplicate systems for each stack.
4Device complexity
If the fuel gas supply pipe and oxygen-containing gas supply pipe are placed inside the heat insulating member, then the system integrates all components, but the overall size of the fuel cell system becomes considerably large
Solution Approach 1:
The gas supply pipes and related components are extracted from the heat insulating housing and positioned externally. The housing contains only the fuel cell stack and essential internal components, while gas supply infrastructure is placed outside, reducing the volume of the heat insulating housing and overall system size while maintaining necessary component integration through external connections.
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 achieves reduced heat radiation and stress, improved sealing performance, and enhanced power generation efficiency by applying a large load to high-sealing areas and a small load to the electrolyte electrode assembly, while maintaining compactness and efficient fuel utilization.
Implementation Method 1
a heat insulating section (114a, 114b) provided in parallel with an extension line extending from the bridge (50) along at least one of outer portions of the sandwiching section (52) for reducing heat radiation from the fuel cells
Implementation Method 2
heat insulating section (114a, 114b) provided in parallel with an extension line extending from the bridge (50) along at least one of outer portions of the sandwiching section (52) for reducing heat radiation from the fuel cells
Implementation Method 3
an electrolyte electrode assembly (38) including an anode (36), a cathode (34), and an electrolyte (32) interposed between the anode and the cathode
Data Source
AI summary
A fuel cell of a fuel cell stack includes separators. Each of the separators includes a fuel gas supply section, a bridge, and a sandwiching section. A fuel gas supply passage extends through the center of the fuel gas supply section, and a fuel gas supply channel is formed in the bridge. A plurality of the fuel cells are stacked together to form a stack body. Side insulating members are provided in parallel with an extension line extending from the bridge, and along both of outer portions of the sandwiching section. The side insulating members suppress heat radiation from the fuel cells, and are used as a reference level for positioning the fuel cells at the time of stacking the fuel cells.