Hydrophilic Filter for Electrochemical Cell Gas Venting
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Solution Overview
Problem
Existing electrochemical cells face challenges in effectively managing the discharge of gases without adversely affecting the flow of liquid electrolytes or the performance of the cell, as harmful gases can increase pressure and damage the cell or its surroundings.
Innovation Solution
An electrochemical cell system with a filter that separates gases from the ionically conductive liquid, featuring a wick to absorb the liquid and a hydrophilic body with pores to allow gas permeation, is introduced to control gas discharge while maintaining electrolyte flow and cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If vents or pressure relief valves are used to disperse gases, then gas discharge is improved, but liquid electrolyte flow and cell performance are adversely affected
Solution Approach 1:
The patent employs a porous hydrophilic body that allows gas molecules to permeate through while maintaining liquid electrolyte flow. The porous structure provides selective permeability where gas can pass through the pores but liquid is retained by capillary forces, thus achieving gas discharge without blocking electrolyte circulation and maintaining cell performance
Solution Approach 2:
The filter assembly acts as an intermediary component between the gas generation source and the cell environment. The wick and hydrophilic body serve as intermediate structures that absorb and transport liquid while allowing gas to pass, mediating between the harmful gas evolution and the cell operation without adversely affecting performance
2Stress or pressure
If vents are used to disperse gases, then gas pressure is reduced, but liquid electrolyte may escape or performance is degraded
Solution Approach 1:
The porous hydrophilic body provides selective permeability based on physical and chemical properties rather than simple mechanical blocking. Gas molecules can permeate through the pores while the hydrophilic nature and capillary forces retain the liquid electrolyte, thus reducing gas pressure while maintaining reliable liquid containment without escape
Solution Approach 2:
The patent changes the physical parameters of the filter material to achieve selective permeability. By selecting specific pore sizes, hydrophilic properties, and capillary pressure characteristics, the system allows gas to pass while retaining liquid, thus managing gas pressure while ensuring reliable electrolyte containment
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 solution effectively manages gas discharge within the cell, preventing damage and ensuring the continued flow of ionically conductive liquid, thereby enhancing the operational stability and efficiency of the electrochemical cell system.
Implementation Method 1
The filter includes a wick configured to absorb a portion of the ionically conductive liquid therein
Implementation Method 2
The hydrophilic body portion contains pores therein so as to permit permeation of the gas therethrough
Data Source
AI summary
An electrochemical cell system is configured to utilize an ionically conductive liquid flowing through a plurality of electrochemical cells. One or more hydrophilic filters for venting of gas from the cells are provided along a flow path for the ionically conductive liquid, so as to permit gasses that evolve in the ionically conductive liquid during charging or discharging to vent outside the cell system, while constraining the ionically conductive liquid within the flow path of the electrochemical cell system.