Electrochemical Cell Mist Filtration for Moisture and Leak Control
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Solution Overview
Problem
Electrochemical cells, particularly metal-air cells, face issues with moisture loss and mist formation due to gas evolution, which can harm the cell and its surroundings, especially in arid environments, and existing venting systems do not effectively manage electrolyte loss or mist dispersal.
Innovation Solution
A mist elimination system comprising a spill prevention device, filter, hydrogen recombination catalyst, neutralizer, and hydrophobic filter to capture and recycle electrolyte mist, neutralize it, and prevent liquid leakage, while managing moisture and carbon dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If gas vents are used to disperse evolved gases, then gas pressure relief is achieved, but electrolyte mist is emitted into the environment causing harm
Solution Approach 1:
A hydrophobic filter membrane is introduced as an intermediary component between the cell interior and外部环境. This membrane allows gas molecules to pass through while blocking liquid electrolyte droplets, thus mediating the conflict between gas venting and mist prevention. The hydrophobic nature of the membrane creates a barrier that selectively permits gas transmission while repelling liquid, solving the contradiction by adding a filtering intermediary layer.
Solution Approach 2:
The patent employs a porous hydrophobic filter membrane with specific pore size and hydrophobic coating to achieve selective permeability. The porous structure allows gas molecules to diffuse through, while the hydrophobic surface tension prevents liquid electrolyte from passing. This material-based solution resolves the contradiction by using the inherent properties of porous hydrophobic materials to differentiate between gas and liquid transmission.
2Stress or pressure
If pressure relief valves are used to release gas when pressure exceeds threshold, then pressure control is achieved, but liquid electrolyte may leak during upset conditions
Solution Approach 1:
The hydrophobic filter membrane utilizes porous material properties with controlled pore sizes and hydrophobic surface treatment. Under normal pressure conditions, gas molecules can pass through the pores. When liquid electrolyte attempts to pass during upset conditions, the hydrophobic surface tension creates a barrier that prevents liquid penetration, thus maintaining pressure control while preventing electrolyte leakage.
Solution Approach 2:
The patent changes the physical parameters of the filter membrane by applying hydrophobic coating with specific surface tension properties. This parameter modification allows the membrane to respond differently to gas versus liquid phases, enabling pressure relief for gases while blocking liquid electrolyte even under pressure upset conditions, thus resolving the contradiction between pressure control and leakage prevention.
3Object-generated harmful factors
If conventional vents are used for gas dispersal, then gas evolution is managed, but moisture loss occurs especially in arid environments
Solution Approach 1:
The hydrophobic filter membrane serves as an intermediary that selectively interacts with gas and moisture phases. It allows evolved gases to pass through while blocking liquid moisture and electrolyte from escaping. This intermediary component resolves the contradiction by providing a selective barrier that manages gas evolution while conserving moisture, particularly important in arid environmental conditions.
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
The system effectively conserves electrolyte and moisture within the cell, reducing mist emission and preventing liquid leakage, enhancing cell performance and longevity, especially in arid conditions.
Implementation Method 1
capturing mists or aerosols created by the generation of gas bubbles within a volume of liquid electrolyte
Implementation Method 2
hydrogen recombination catalyst
Implementation Method 3
hydrophobic filter to capture and recycle electrolyte mist, neutralize it, and prevent liquid leakage
Data Source
AI summary
An electrochemical cell includes a mist elimination system that prevents mist from escaping from the cell chamber and conserves moisture within the cell. An exemplary mist elimination system includes a spill prevention device that reduces or prevents an electrolyte from escaping from the cell chamber in the event of an upset, wherein the electrochemical cell is tipped over. A mist elimination system includes a recombination portion that reacts with hydrogen to produce water, that may be reintroduced into the cell chamber. A mist elimination system includes a neutralizer portion that reacts with an electrolyte to bring the pH closer to neutral, as acid/base reaction. A mist elimination system includes a filter that captures mist that may be reintroduced into the cell chamber. A mist elimination system includes a hydrophobic filter on the outer surface to prevent water and other liquids from entering into the mist elimination system.