Fuel Cell Separator Bead Design for Gas Leakage Prevention
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Solution Overview
Problem
Existing fuel cell separators and stacks face complexity in coolant flow field design, which affects the reliability of coolant discharge and air release, leading to potential leakage and inefficiencies in gas flow management.
Innovation Solution
A fuel cell separator design featuring two metal plates joined with beads that form a seal to prevent gas leakage, where air release and coolant drain passages are connected to the coolant flow field through recessed channels on the beads, simplifying the coolant flow field structure and enhancing discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air release passage and coolant drain passage are connected to coolant flow field through conventional structures, then coolant discharge and air release functions are achieved, but the coolant flow field structure becomes complex
Solution Approach 1:
The patent merges the air release passage and coolant drain passage connections into a single integrated structure. The bead structure simultaneously forms both passages and their connections to the coolant flow field, eliminating the need for separate connection structures and reducing overall complexity while maintaining functional reliability
Solution Approach 2:
The bead structure serves multiple functions: it seals the reactant gas flow field, forms the air release passage, forms the coolant drain passage, and provides connection channels to the coolant flow field. This multi-functionality reduces the number of separate components needed and simplifies the overall coolant flow field structure
2Reliability
If bead seal structure is used to prevent reactant gas leakage, then sealing reliability is improved, but the structure becomes more complex
Solution Approach 1:
The patent combines the seal bead with the connection beads for air release and coolant drain passages into a single integrated bead structure. This merging eliminates the need for separate seal beads and connection structures, reducing complexity while maintaining sealing reliability through the continuous bead configuration
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 utilizes the recesses on the beads to connect air release and coolant drain passages to the coolant flow field, achieving a simpler and more reliable coolant flow management system, reducing leakage and improving gas flow efficiency within the fuel cell stack.
Implementation Method 1
a bead protruding from one surface of each of the metal separator plates where a reactant gas flows, the bead including a seal bead configured to prevent leakage of the reactant gas
Implementation Method 2
a coolant flow field being formed between the two metal separator plates
Implementation Method 3
a coolant flow field being formed between the two metal separator plates
Data Source
AI summary
A coolant flow field is formed between first and second metal separator plates of a joint separator (fuel cell separator). First and second beads protrude from the first and second metal separator plates. The beads include inner beads for preventing leakage of a reactant gas. An air release passage and a coolant drain passage extend through the fuel cell separator in a separator thickness direction, and the air release passage and the coolant drain passage are connected to a coolant flow field through a first connection channel and a second connection channel formed by recesses on the back of protrusions of the first and second beads.