Fuel Cell Shutdown Control for Moisture Freezing Prevention
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Solution Overview
Problem
Fuel cells face performance deterioration due to water freezing during shutdown in cold temperatures, leading to noise, hydrogen consumption, and prolonged shutdown times, necessitating a method to determine and limit water discharge.
Innovation Solution
A shutdown control method and system that applies power to a controller to determine the possibility of moisture freezing based on estimated and measured temperatures, executing moisture removal only when necessary, using an air compressor to discharge water from the fuel cell stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture removal control is performed during shutdown to prevent water freezing, then reliability is improved, but loss of energy increases due to hydrogen consumption
Solution Approach 1:
The controller performs preliminary assessment of freezing risk by checking temperature conditions before shutdown. If the outdoor temperature is above the freezing point, the controller determines that moisture removal is unnecessary, thereby preventing energy consumption while ensuring reliability when needed.
Solution Approach 2:
The controller continuously monitors outdoor temperature and uses this feedback to dynamically decide whether to perform moisture removal control. This feedback mechanism ensures that energy is consumed only when necessary to prevent freezing, optimizing both reliability and energy efficiency.
2Reliability
If moisture removal control is performed during shutdown to prevent water freezing, then reliability is improved, but loss of time increases due to prolonged shutdown
Solution Approach 1:
The controller assesses freezing risk before initiating shutdown procedures. By determining in advance whether moisture removal is necessary based on temperature conditions, the controller avoids unnecessary shutdown extensions, thereby maintaining reliability while minimizing time loss.
Solution Approach 2:
The controller uses real-time temperature feedback to dynamically adjust shutdown duration. When temperature conditions indicate no freezing risk, the controller shortens or eliminates moisture removal operations, reducing shutdown time while preserving reliability when conditions require it.
3Reliability
If moisture removal control is performed during shutdown to prevent water freezing, then reliability is improved, but object-generated harmful factors increase due to noise
Solution Approach 1:
The controller evaluates freezing risk before shutdown based on outdoor temperature. By determining in advance whether moisture removal is necessary, the controller prevents unnecessary noise-generating operations, thereby improving reliability only when needed while minimizing harmful noise emissions.
Solution Approach 2:
The controller continuously monitors temperature and uses this feedback to suppress moisture removal operations when freezing risk is low. This feedback-based suppression eliminates unnecessary noise generation while maintaining reliability when temperature conditions indicate potential freezing hazards.
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 approach limits hydrogen consumption and power waste, reduces shutdown time, and minimizes noise, thereby enhancing fuel efficiency and merchantable quality by selectively performing moisture removal control.
Implementation Method 1
discharging moisture out of the fuel cell stack by operating an air compressor configured to supply air to the fuel cell stack
Implementation Method 2
determining, by the controller to which the power is applied, a possibility of moisture freezing based on an estimated outdoor temperature, a temperature of a fuel cell stack, or a measured outdoor temperature
Data Source
AI summary
A shutdown control method of a fuel cell is provided. The method includes applying power to a controller in a shutdown state and determining, by the controller to which the power is applied, a possibility of moisture freezing based on an estimated outdoor temperature or the temperature of a fuel cell stack. A shutdown of the fuel cell is executed by performing moisture removal from the fuel cell stack in response to determining the possibility of moisture freezing after restart.