Fuel Cell Restart Control for Mixed Potential and Reverse Current
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Solution Overview
Problem
Existing fuel cell systems struggle to prevent deterioration due to the generation of mixed potential and reverse current under various operating conditions, particularly during restarts and non-cold start scenarios, leading to local degradation and reduced performance.
Innovation Solution
A method and device for controlling fuel cell deterioration by diagnosing the risk of mixed potential and reverse current through real-time monitoring, and implementing strategies such as controlling hydrogen and air recirculation, cooling water management, and hydrogen pressure to prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the fuel cell is operated under dry condition or flooding condition, then the fuel cell can operate continuously, but deterioration of the fuel cell is accelerated
Solution Approach 1:
The system performs preliminary diagnosis of mixed potential and reverse current risks before they cause actual damage. By detecting early signs of these conditions through voltage measurements and operational parameter analysis, the control system can take preventive actions (such as adjusting air/hydrogen flow rates) before deterioration accelerates, thus maintaining both continuous operation capability and fuel cell durability
2Reliability
If the COD heater method is used to remove residual oxygen from the cathode, then deterioration during cold start is prevented, but deterioration due to mixed potential and reverse current under other operating conditions cannot be prevented
Solution Approach 1:
The control system is designed to perform multiple functions: it not only executes the traditional COD heater operation for cold start protection but also continuously monitors for mixed potential and reverse current conditions during all operating phases (normal operation, shutdown, restart). By integrating universal diagnostic capabilities that work across all operating conditions, the system provides comprehensive protection beyond just cold start scenarios
3Reliability
If real-time diagnosis and selective strategy application is implemented, then fuel cell deterioration is effectively prevented, but system complexity increases
Solution Approach 1:
The system continuously measures operational parameters (voltage, current, flow rates) and uses this feedback to diagnose the presence of mixed potential or reverse current conditions. Based on the diagnosis results, the control system selectively applies appropriate prevention strategies (such as adjusting air supply, hydrogen supply, or activating heaters). This feedback-based approach enables effective deterioration prevention while maintaining reasonable system complexity by only activating additional controls when actually needed
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
Effectively prevents fuel cell degradation by optimizing operations based on real-time diagnosis, enhancing stability and durability under diverse conditions, including restarts and temporary stops.
Implementation Method 1
a polymer electrolyte membrane transfers hydrogen ions
Implementation Method 2
acts as a barrier that prevents hydrogen and oxygen from meeting each other
Implementation Method 3
acts as an electrical insulator between two electrodes, which are the anode and the cathode
Implementation Method 4
gas permeates the polymer electrolyte membrane
Implementation Method 5
gas permeates the polymer electrolyte membrane
Implementation Method 6
by the action of platinum catalysis
Implementation Method 7
The hydrogen peroxide or radicals attack the polymer of the electrolyte membrane
Data Source
AI summary
Disclosed is a method and a device configured to control deterioration avoidance operation of a fuel cell system. In one aspect, the method may include starting the deterioration avoidance operation when an operation of a fuel cell is restarted in a state where an energy storage device is operating, and the fuel cell is stopped; controlling anode hydrogen pressure based on a predetermined condition, the condition indicating that the anode hydrogen pressure needs to be increased; determining hydrogen recirculation and supplying hydrogen including a process to determine whether to recirculate hydrogen based on a predetermined condition, the condition indicating that hydrogen needs to be recirculated, before supplying hydrogen; determining air recirculation and supplying air including a process to determine whether to recirculate air based on a predetermined condition, the condition indicating that air needs to be recirculated, before supplying air; and terminating the deterioration avoidance operation and starting operation of the fuel cell.