Electrochemical Cell Venting to Reduce Salt Build-Up
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Solution Overview
Problem
Existing electrochemical cells with venting devices suffer from the formation of salt, such as potassium carbonate, on the venting device due to electrolyte aerosol passing through the flame arrestor element, which affects aesthetics and consumer perception of quality.
Innovation Solution
Incorporating a surface tension reducing agent and a foam suppressant agent into the electrochemical cell, where the surface tension reducing agent is integrated into the flame arrestor element and the foam suppressant agent is added to the liquid electrolyte, effectively reducing the amount of electrolyte aerosol that reaches the venting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flame arrestor element with pores is used to allow gas to escape, then gas venting function is improved, but electrolyte aerosol passes through and causes salting on the venting device
Solution Approach 1:
A hydrophobic porous layer is introduced as an intermediary between the flame arrestor element and the external environment. This layer acts as a mediator that allows gas molecules to pass through while blocking electrolyte aerosol droplets, thus preventing salt formation on the venting device exterior while maintaining the gas venting function
Solution Approach 2:
The surface tension properties of the porous layer are specifically engineered to be hydrophobic, creating a parameter change that selectively permits gas passage while repelling electrolyte aerosol. This parameter modification (hydrophobicity) enables the layer to differentiate between gas molecules and liquid aerosol droplets
2Object-generated harmful factors
If mechanical barriers are added to reduce aerosol passage, then salt formation is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of complex mechanical barriers, a porous material with specific hydrophobic properties is used to achieve aerosol reduction. The porous structure naturally filters aerosol while allowing gas passage, simplifying the overall device design compared to mechanical barrier solutions
Solution Approach 2:
The hydrophobic porous layer can be applied as a coating or integrated layer that is relatively simple and cost-effective to manufacture, replacing complex mechanical barrier systems with a more economical and simpler structural solution
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 combination of surface tension reducing agent and foam suppressant agent significantly reduces the formation of salt on the venting device by minimizing the passage of electrolyte aerosol through the flame arrestor element, thereby enhancing the aesthetic appeal and perceived quality of the electrochemical cell.
Implementation Method 1
the at least one flame arrestor element comprises a surface tension reducing agent
Implementation Method 2
the volume of liquid further comprises a foam suppressant agent
Implementation Method 3
the at least one flame arrestor element comprises a surface tension reducing agent
Data Source
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AI summary
The electrochemical cell (20) comprises: - a housing (30) defining a cavity (38); - an electrochemical bundle (39) arranged within the cavity (38) and comprising at least one electrochemical assembly (42) comprising a positive electrode (40), a negative electrode (50) and a separator (54) interposed between the positive and negative electrodes (40, 50); - a volume of liquid (60) arranged within the cavity (38), comprising an electrolyte and in which the electrochemical assembly (42) is at least partially immersed; - a venting device (70) comprising a flame arrestor element, the venting device (70) being designed to allow gas generated within the cavity (38) to escape outside of the cavity (38) through the flame arrestor element. The flame arrestor element comprises a surface tension reducing agent and the volume of liquid (60) further comprises a foam suppressant agent.