Fuel Cell Stack Cooling Water Diffusion Portion Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fuel cell stacks, the existing configuration with stepped portions for cooling water channels is difficult to precisely shape and control, leading to deviations in cooling water distribution, which deteriorates fuel cell efficiency.
Innovation Solution
A fuel cell stack design that eliminates the stepped portion by using parallel cooling water flow paths between the anode and cathode separators, with lands and channels on each separator facing each other to distribute cooling water efficiently without the need for a stepped configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a stepped portion is used to distribute cooling water in the channel, then cooling water distribution is attempted, but the stepped portion is difficult to precisely shape and control, leading to deviations in cooling water distribution
Solution Approach 1:
The invention removes the stepped portion from the channel structure entirely. Instead of using a stepped configuration to distribute cooling water, the patent employs a flat channel bottom with cooling water diffusion portions that extend from the channel walls toward the center, eliminating the manufacturing difficulties associated with shaping and controlling stepped portions while achieving uniform cooling water distribution.
Solution Approach 2:
Instead of using a stepped portion that protrudes into the channel to distribute cooling water, the invention inverts the approach by using cooling water diffusion portions that extend from the channel walls toward the center on a flat channel bottom. This inverted configuration achieves the same distribution function with superior manufacturability and control.
2Productivity
If a stepped portion is used for cooling water distribution, then water flow distribution is attempted, but deviations occur that deteriorate fuel cell efficiency
Solution Approach 1:
The invention removes the unreliable stepped portion and replaces it with cooling water diffusion portions that extend from the channel walls on a flat bottom. This configuration provides consistent and reliable cooling water distribution across the reaction surface, eliminating the deviations that occur with stepped portions and thereby maintaining high fuel cell efficiency.
Solution Approach 2:
The invention applies local quality by creating cooling water diffusion portions at specific locations along the channel walls, which extend toward the channel center to locally enhance cooling water distribution. This localized approach ensures uniform water delivery to different regions of the reaction surface, improving overall system reliability and efficiency.
3Temperature
If a stepped portion is used to introduce cooling water, then cooling function is enhanced, but the configuration becomes complex and difficult to control
Solution Approach 1:
The invention removes the complex stepped portion configuration and replaces it with a simpler flat channel bottom featuring cooling water diffusion portions. This simplified structure maintains effective cooling function by allowing cooling water to flow along the channel and diffuse toward the reaction surface through the diffusion portions, reducing structural complexity while preserving thermal management performance.
Solution Approach 2:
Instead of using a stepped configuration that adds structural complexity, the invention inverts the approach by using a flat channel bottom with diffusion portions extending from the walls. This inverted design achieves the same cooling enhancement with a simpler, more controllable structure that is easier to manufacture and maintain.
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 improves the flow of both cooling water and reactant gas, preventing defects in channel formation and enhancing overall fuel cell efficiency by ensuring uniform cooling water distribution across the reaction surface.
Implementation Method 1
a cooling water diffusion portion disposed on each of an anode separator and a cathode separator to introduce the cooling water from a cooling water manifold by distributing the cooling water on a reaction surface
Implementation Method 2
a first cooling water flow path area disposed between a land formed on the cooling water diffusion portion of the anode separator and a channel formed on the cooling water diffusion portion of the cathode separator
Data Source
AI summary
A fuel cell stack is provided to improve the flow of cooling water and reactant gas. The fuel cell stack includes a cooling water diffusion portion provided on each of the anode separator and the cathode separator. A first cooling water flow path area is provided between a land formed on the cooling water diffusion portion of the anode separator and a channel formed on the cooling water diffusion portion of the cathode separator. A second cooling water flow path area is provided between a channel formed on the cooling water diffusion portion of the anode separator and a land formed on the cooling water diffusion portion of the cathode separator. In addition, the first cooling water flow path area and the second cooling water flow path area are parallel with each other within at least a part of the cooling water diffusion portions.