HT-PEM Fuel Cell Stack Layout for Uniform Temperature Control
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Solution Overview
Problem
High-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) stacks face performance degradation and reduced durability due to non-uniform temperature distribution and harsh operational conditions, including exposure to phosphoric acid and high temperatures, which also lead to gas leakage and coolant-related damage.
Innovation Solution
The HT-PEMFC stack design includes a coolant inlet with varying numbers of cell units in each cell assembly, decreasing with distance from the coolant inlet, and incorporates dummy cells with thermocouples and insulating members to maintain uniform temperature and prevent gas leakage through optimized cooling and pressure measurement systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HT-PEMFC operates at high temperature (150°C to 180°C), then CO resistance increases and electrochemical reaction rate improves, but temperature non-uniformity occurs in stacking direction leading to performance degradation
Solution Approach 1:
The patent applies local quality by varying the number of cell units in different cell assemblies along the stacking direction. Cell assemblies closer to the coolant inlet have fewer cell units while those farther away have more cell units, creating a non-uniform structural distribution that compensates for temperature gradients and maintains uniform temperature across the stack.
2Temperature
If oil is used as coolant, then cooling capability is provided, but high viscosity causes high differential pressure leading to damage to the HT-PEMFC
Solution Approach 1:
The patent changes the parameter of cell unit distribution along the stacking direction to compensate for the harmful effects of oil coolant. By having fewer cell units near the coolant inlet and more cell units farther away, the system balances the pressure distribution and temperature control, mitigating the damage caused by high differential pressure from oil coolant circulation.
3Ease of manufacture
If the number of cell units is uniform across all cell assemblies, then manufacturing is simplified, but temperature non-uniformity occurs reducing efficiency
Solution Approach 1:
The patent deliberately introduces asymmetry in the number of cell units across different cell assemblies. Instead of uniform distribution, cell assemblies are designed with varying numbers of cell units based on their position relative to the coolant inlet, creating an asymmetric structure that optimizes thermal management and maintains 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
This design enhances temperature uniformity, increases fuel cell efficiency, and prevents performance and durability degradation by minimizing temperature non-uniformity and ensuring proper coupling, thereby extending the lifespan of the HT-PEMFC stack.
Implementation Method 1
a coolant inlet configured to allow a coolant to flow in; a plurality of cooling plates configured to move the coolant that flows in through the coolant inlet
Implementation Method 2
incorporates dummy cells with thermocouples and insulating members to maintain uniform temperature
Data Source
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AI summary
Provided is a high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) stack for optimizing a stack operation, the HT-PEMFC stack including a coolant inlet configured to allow a coolant to flow in, a plurality of cooling plates (13) configured to move the coolant that flows in through the coolant inlet, and a plurality of cell assemblies (12) each provided between two cooling plates adjacent to each other among the plurality of cooling plates, and each cell assembly including a plurality of cell units (121). At least a portion of the plurality of cell assemblies each may include a different number of cell units.