Electrochemical Cell Shunt Current Interruption via Droplet Dispersion
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Solution Overview
Problem
In electrochemical cell systems utilizing a liquid electrolyte, shunt current poses a significant challenge as it reduces the overall potential difference across the cell module, particularly between the first and last cells in a series, necessitating effective interruption to prevent counter-productive current flow.
Innovation Solution
The implementation of a dispersing system that breaks the ionically conductive medium into discrete droplets and recombines them, incorporating an air inlet and pump to inhibit foam growth, thereby disrupting electrical shunt current and maintaining effective current isolation between cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ionically conductive medium flows continuously through multiple electrochemical cells, then electrochemical reactions are supported at the electrodes, but shunt current flows between cells causing potential difference loss
Solution Approach 1:
The dispersing system segments the continuous ionically conductive medium into discrete droplets, creating physical isolation between cells. This segmentation prevents shunt current pathways while maintaining ionic conductivity within each cell, resolving the contradiction between continuous flow for electrochemical reactions and current isolation to prevent energy loss.
Solution Approach 2:
The dispersing system acts as an intermediary component in the electrolyte circulation path, temporarily breaking the medium into droplets to interrupt shunt current, then recombining it to restore continuous flow. This intermediary action allows the system to alternately achieve current isolation and continuous ionic conduction, preventing energy loss while maintaining electrochemical reaction support.
2Reliability
If the ionically conductive medium is dispersed into discrete droplets to interrupt shunt current, then electrical isolation between cells is achieved, but foam growth may occur in the dispersing system
Solution Approach 1:
The air pump, which could potentially cause foam growth by introducing air into the dispersed medium, is instead used strategically to suppress foam. The air injection disrupts foam formation mechanisms and maintains droplet dispersion stability, converting a potential harmful effect into a beneficial foam-control mechanism that supports reliable shunt current interruption.
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 reduces shunt current, maintaining a stable potential difference across the cell module by physically separating the ionically conductive medium and preventing electrical connections, thus enhancing the performance and efficiency of the electrochemical cell system.
Implementation Method 1
a disperser configured to separate the ionically conductive medium into a plurality of discrete droplets
Implementation Method 2
an air pump configured to pump an amount of air into a post-dispersal chamber through the air inlet to inhibit growth of ionically conductive foam on the recombined ionically conductive medium
Implementation Method 3
an ionically conductive medium for conducting ions between the fuel and oxidant electrodes to support electrochemical reactions at the fuel and oxidant electrodes
Data Source
Figure 1A
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AI summary
An electrochemical cell system is configured to utilize an ionically conductive medium flowing through a plurality of electrochemical cells. One or more disperser chambers are provided to disrupt or minimize electrical current flowing between the electrochemical cells, such as between the cathode of one cell and the anode of a subsequent cell by dispersing the ionically conductive medium. Air is introduced into the disperser chamber to prevent the formation of foamed ionically conductive medium, which may reconnect the dispersed ionically conductive medium, allowing the current to again flow therethrough.