Solid Polymer Fuel Cell Cooling Manifold Design
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Solution Overview
Problem
Fuel cells using solid polymer electrolytes face challenges in maintaining stable power generation and heat collection performance during output changes, leading to potential voltage instability and corrosion due to excessive cooling liquid flow and temperature fluctuations.
Innovation Solution
A fuel cell design with a constant flow channel cross-sectional area in the cooling liquid manifold and a longer flow channel length, combined with a folded-back or spiral flow channel configuration, to suppress corrosion currents and prevent drift of cooling liquid, ensuring stable voltage and reduced corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling liquid flow channel cross-sectional area is increased to improve heat removal, then cooling efficiency is improved, but corrosion current increases and voltage instability occurs
Solution Approach 1:
The patent applies parameter changes by optimizing the flow channel cross-sectional area to a specific range (0.5-5.0 cm²) and controlling the flow rate within 10-100 mL/min. This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where sufficient heat removal is achieved while corrosion current and voltage instability are suppressed.
2Temperature
If the cooling liquid flow rate is increased to improve cooling performance, then temperature control is improved, but corrosion of constituent members accelerates
Solution Approach 1:
The patent controls the cooling liquid flow rate within a specific parameter range (10-100 mL/min) to resolve the contradiction. This parameter optimization ensures adequate cooling performance while limiting the corrosion current that accelerates with higher flow rates, thereby preventing corrosion of fuel cell constituents.
3Object-affected harmful factors
If the flow channel cross-sectional area is decreased to suppress corrosion current, then corrosion is reduced, but heat removal efficiency decreases
Solution Approach 1:
The patent determines an optimal flow channel cross-sectional area range (0.5-5.0 cm²) that balances two opposing requirements: suppressing corrosion current while maintaining adequate heat removal. This parameter optimization resolves the contradiction by identifying the threshold value where both objectives are simultaneously satisfied.
4Reliability
If the cooling liquid flow channel length is increased to suppress corrosion, then durability is improved, but pressure loss increases
Solution Approach 1:
The patent optimizes the flow channel length within specific constraints to resolve the contradiction between durability and pressure loss. By controlling the length to be sufficiently long for corrosion suppression while limiting excessive length that would cause prohibitive pressure losses, the parameter optimization achieves both durability improvement and energy efficiency.
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 stabilizes voltage during output changes, suppresses corrosion currents, and enhances durability by maintaining uniform cooling liquid flow and preventing condensation issues, resulting in improved power generation performance and long-term reliability.
Implementation Method 1
The fuel cell generates heat during operation, and thus it is necessary for the fuel cell to be cooled down with a cooling liquid so as to approximately maintain a temperature state of the fuel battery cell
Implementation Method 2
a polymer electrolyte membrane that selectively conveys hydrogen ions
Implementation Method 3
A fuel cell using a solid polymer electrolyte in the related art is a device that allows a fuel gas containing hydrogen and an oxidant gas such as air containing oxygen to electrochemically react with each other and generates power and heat at the same time
Data Source
AI summary
In a solid polymer fuel cell, destabilization of a voltage when an output state is changed is suppressed, and flow of a corrosion current through a cooling liquid in a cooling liquid manifold is reduced. The fuel cell is constructed by laminating a plurality of fuel battery cells, each including an MEA, a pair of separators, a frame that surrounds the periphery of the MEA, an anode, and a cathode, and a cooling liquid manifold that is formed by the frame. A flow channel of the cooling liquid manifold has a constant flow channel cross-sectional area, and a flow channel length of the cooling liquid manifold, which is included in one of the fuel battery cells, along a flow channel direction is longer than the thickness of the one fuel battery cell in a stacked direction.