Conductive Fiber Bipolar Plate for Uniform Fuel Cell Cold Start Heating
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Solution Overview
Problem
Fuel cell devices experience prolonged time to reach operating temperature during cold start, hindering their performance compared to electric engines, as they rely on external heat exchangers for warming cryogenic liquefied fuels.
Innovation Solution
Integration of electrically conductive carbon nanotube fibers within bipolar plates, enabled by additive manufacturing, which can be heated upon power supply, providing uniform and rapid heating to the fuel cell components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heat exchangers are used to warm cryogenic liquefied fuel, then the fuel can be converted from liquid to gas form, but the device complexity increases and the cold start time is prolonged
Solution Approach 1:
The heating function is merged into the bipolar plate structure itself by integrating conductive fibers directly into the plate. This eliminates the need for separate external heat exchangers and enables direct heating of the fuel at its storage location, thereby reducing cold start time while maintaining the temperature conversion function.
Solution Approach 2:
The conductive fibers are pre-integrated into the bipolar plate during manufacturing, creating a ready-to-use heating system before the fuel cell device is activated. This preliminary integration allows immediate heating capability upon power supply, avoiding the time delay associated with external heat exchanger systems during cold start.
2Temperature
If external heat exchangers are used for warming fuel, then the fuel can be vaporized, but the device complexity and number of components increase
Solution Approach 1:
The heating function is merged into the bipolar plate structure itself by integrating conductive fibers directly into the plate. This eliminates the need for separate external heat exchangers and enables direct heating of the fuel at its storage location, thereby reducing cold start time while maintaining the temperature conversion function.
Solution Approach 2:
The bipolar plate serves multiple functions: it acts as both a structural component of the fuel cell device and an integrated heating element. By incorporating conductive fibers, the plate can directly heat the cryogenic fuel, eliminating the need for dedicated external heating devices and reducing overall system complexity.
3Ease of manufacture
If conventional bipolar plates without integrated heating are used, then the manufacturing is simpler, but the cold start behavior is slower
Solution Approach 1:
The bipolar plate is manufactured as a composite structure combining traditional plate materials with integrated conductive fibers. This composite approach enables the plate to possess both its original structural properties and new heating capabilities, achieving improved cold start performance while maintaining manufacturing feasibility through additive manufacturing or fiber integration techniques.
4Speed
If conductive fibers are integrated into the bipolar plate, then the heating speed and uniformity improve, but the manufacturing complexity increases
Solution Approach 1:
The bipolar plate is manufactured as a composite structure combining traditional plate materials with integrated conductive fibers. This composite approach enables the plate to possess both its original structural properties and new heating capabilities, achieving improved cold start performance while maintaining manufacturing feasibility through additive manufacturing or fiber integration techniques.
Solution Approach 2:
The complex mechanical integration of separate heating components is replaced by directly embedding conductive fibers into the bipolar plate structure. This substitution simplifies the overall system architecture by eliminating the need for mechanical assembly of heating elements, reducing structural complexity while maintaining rapid and uniform heating performance.
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 solution enables faster and more uniform temperature distribution within the fuel cell, reducing the need for external heat exchangers and enhancing the cold start behavior of fuel cell devices by utilizing the heating effect of carbon nanotube fibers and graphene-enriched resins.
Implementation Method 1
the one or more fibers are heated when power is supplied to the ply
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A bipolar plate (40) for use in a fuel cell device (12), the bipolar plate (36) including an integrated ply (74), the ply (74) including one or more electrically conductive fibers (84) and being configured and electrically connectable to a power supply (38) such that the one or more fibers (84) are heated when power is supplied to the ply (74).