End Cell Heater for Fuel Cell Cold-Start Anti-Freeze
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Solution Overview
Problem
Fuel cell stacks experience deteriorated initial start ability and driving performance due to water freezing in end cells during cold temperatures, as existing technologies fail to prevent water from freezing in reaction cells.
Innovation Solution
An end cell heater is designed with a configuration that includes a body, upper and lower covers, air and fuel channels, a heating element, and an electricity collecting plate, where fusing protrusions and grooves are used for bonding and sealing, ensuring air-tightness and pressure resistance, and the heater is integrated with the end cells to prevent water freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heaters are disposed on end cells to prevent water freezing, then initial start ability and driving performance are improved, but device complexity increases
Solution Approach 1:
The heating element is integrated with the end cell structure by stacking the upper cover on the heating element, merging two separate components (heater and end cell) into a unified assembly. This reduces overall system complexity while maintaining the anti-freezing function.
Solution Approach 2:
The end cell structure serves multiple functions: it provides structural support for the fuel cell stack, contains air channels for reactant flow, and integrates the heating element for temperature maintenance. This multi-functionality eliminates the need for separate heater housings or mounting structures.
2Reliability
If fusing protrusions and grooves are used for bonding covers to body, then air-tightness and pressure resistance are secured, but manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring uniform precision across the entire bonding surface, the design concentrates sealing functionality at specific locations where fusing protrusions and grooves interact. The protrusions act as localized sealing points, allowing the rest of the surface to have more tolerance.
Solution Approach 2:
The fusing protrusions and grooves create an asymmetric interlocking geometry that provides both mechanical bonding and sealing. The asymmetric shape ensures proper alignment during assembly while maintaining air-tightness, reducing the need for extremely tight tolerances.
3Temperature
If heating element is stacked on end cell with electricity collecting plate, then water freezing is prevented, but device complexity increases
Solution Approach 1:
The heating element is pre-positioned within the end cell structure during assembly, with the electricity collecting plate already integrated. This preliminary arrangement eliminates the need for separate installation steps and reduces operational complexity, even though the structure appears more complex initially.
Solution Approach 2:
The heating element is nested within the end cell structure, with the electricity collecting plate forming part of the same stacked assembly. This nested configuration allows multiple functional components to occupy the same spatial envelope, avoiding the need for additional external heater components.
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 end cell heater effectively prevents water from freezing in reaction cells, thereby improving the initial start ability and driving performance of fuel cells by maintaining air-tightness and pressure resistance, ensuring efficient operation during cold conditions.
Implementation Method 1
a heating element 200 stacked on and coupled to the end cell 100
Implementation Method 2
the fusing protrusions may be melted, such that the body 110 and the upper cover 120 are bonded to each other
Data Source
AI summary
Provided is an end cell heater for a fuel cell capable of preventing water existing in reaction cells of a fuel cell stack from being frozen to improve initial start ability and initial driving performance of the fuel cell at the time of cold-starting the fuel cell during winter by disposing heaters on end cells disposed at both ends of the fuel cell stack and capable of securing air-tightness and pressure resistance properties of air passages and fuel passages formed in the end cell.