Electrode Water Detection Using Electrolysis Threshold Current Response
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Solution Overview
Problem
Existing water detecting devices in power generation cells face challenges in accurately differentiating between liquid water presence and short-circuiting in reactant gas flow fields, leading to potential misinterpretation of detection results.
Innovation Solution
A water detecting device and method that apply a voltage range including a first voltage below and a second voltage above the electrolysis voltage of water to a pair of electrodes, analyzing the change in electric current to distinguish between liquid water presence and short-circuiting, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage applying unit applies a voltage to a pair of electrodes to detect liquid water, then water detection capability is provided, but it becomes difficult to differentiate between liquid water presence and short-circuiting
Solution Approach 1:
The voltage applying unit dynamically changes the voltage within an application range that includes both below and above the electrolysis voltage of water. By applying multiple voltage levels and observing the corresponding current changes, the system can differentiate between liquid water presence (which shows characteristic current changes at electrolysis voltage) and short-circuiting (which shows different current characteristics).
Solution Approach 2:
The invention changes the voltage parameter applied to the electrodes from a fixed value to a variable range including both sub-electrolysis and super-electrolysis voltages. This parameter change enables the detection system to observe how current responds to different voltage levels, providing a signature that distinguishes liquid water from short-circuit conditions.
2Reliability
If liquid water accumulates in the reactant gas flow field, then power generation stability decreases, but water detection and discharge timing control is needed
Solution Approach 1:
The water detecting device provides real-time feedback about liquid water presence in the reactant gas flow field to the control system. This feedback enables the control system to adjust discharge timing and water management operations dynamically, maintaining power generation stability without requiring overly complex manual intervention systems.
3Device complexity
If a simple current detection method is used, then device complexity is reduced, but detection accuracy between water and short-circuit cannot be improved
Solution Approach 1:
The voltage applying unit periodically applies different voltage levels within the application range to the electrodes. By observing the periodic current responses at different voltage levels, the system can identify patterns characteristic of liquid water versus short-circuit conditions without requiring complex additional hardware.
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 enhances the accuracy of liquid water detection in reactant gas flow fields by differentiating between liquid water and short-circuiting conditions, reducing false positives and improving operational reliability of power generation cells.
Implementation Method 1
a voltage applying unit configured to apply a voltage to the pair of electrodes, the voltage applying unit being configured to change the voltage applied to the pair of electrodes within an application range that includes a first voltage which is smaller than an electrolysis voltage of the water and a second voltage which is larger than the electrolysis voltage of the water
Data Source
AI summary
A voltage applying unit of a water detecting device applies, to a pair of electrodes, a voltage changing within an application range that includes a first voltage which is smaller than an electrolysis voltage of water and a second voltage which is larger than the electrolysis voltage of the water. A judging unit judges presence or absence of the water based on change in electric current measured by a current measuring unit when the voltage changing within the application range is applied to the pair of electrodes.