Electrochemical Cell Water Balance Control via Oxidant Flow Feedback
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Solution Overview
Problem
Existing water management technologies in electrochemical cells struggle to maintain a balance between flooded and dried-out states, leading to instability and potential failure due to inefficient removal of water, which is essential for the cell's operation.
Innovation Solution
A method and system that determine and track the cumulative water imbalance by calculating the difference between water introduced, created, and discharged within the cell, using sensors to adjust the oxidant feed gas flow rate to maintain equilibrium, thereby preventing flooding or drying out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water removal is increased to prevent flooding, then flooding is reduced, but cell drying out risk increases
Solution Approach 1:
The system continuously monitors water balance by measuring humidity of inlet and outlet gases, calculating water production from current, and adjusting oxidant flow rate based on cumulative water imbalance feedback to maintain equilibrium between water removal and cell hydration needs
Solution Approach 2:
The oxidant flow rate is dynamically adjusted in real-time based on changing operating conditions and cumulative water imbalance, allowing the system to adapt to varying loads and environmental conditions while maintaining water balance stability
2Productivity
If water removal is increased to improve performance, then efficiency is improved, but cell stability deteriorates
Solution Approach 1:
The controller uses feedback from humidity sensors and current measurements to calculate water imbalance and adjust oxidant flow rate, enabling the system to maintain water content equilibrium while operating at high electrical power output levels
Solution Approach 2:
The system proactively adjusts oxidant flow rate based on cumulative water imbalance before severe flooding or drying occurs, preventing performance degradation and maintaining stable composition while maximizing productivity
3Quantity of substance
If traditional water removal methods are used, then water is removed from cell, but water balance control is insufficient
Solution Approach 1:
The system implements precise water balance monitoring by measuring inlet/outlet gas humidity, calculating water production from electrochemical current, and using this feedback to adjust oxidant flow rate for accurate water balance control
Solution Approach 2:
The patent replaces traditional mechanical water removal methods with an electrochemical-based water management system that uses current measurement and humidity sensing to precisely control water balance through oxidant flow adjustment
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 effectively maintains water balance, ensuring stable operation of electrochemical cells by proactively adjusting the oxidant feed gas flow rate based on real-time and cumulative water imbalances, preventing performance degradation or failure.
Implementation Method 1
a fuel cell converts the chemical energy of fuel (e.g., hydrogen, natural gas, methanol, gasoline, etc.) and an oxidant (air or oxygen) into electricity and waste products of heat and water
Implementation Method 2
The protons diffuse through the electrolyte membrane to the cathode
Implementation Method 3
a fuel cell converts the chemical energy of fuel (e.g., hydrogen, natural gas, methanol, gasoline, etc.) and an oxidant (air or oxygen) into electricity and waste products of heat and water
Data Source
AI summary
An electrochemical cell system and a method of controlling water imbalance is provided. The electrochemical cell system and the method both include determining a present water imbalance in the electrochemical cell by summing a waterin and a watercreated less a waterout; tracking a cumulative water imbalance during operation of the electrochemical cell by repeatedly determining the present water imbalance and continuing to sum the results during operation; and adjusting a flow rate of the oxidant feed gas entering the electrochemical cell based on the cumulative water imbalance.