Current Tab Member Layout for Safer Supercapacitor Electrolyte Filling
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Solution Overview
Problem
The manufacturing of supercapacitors with microporous carbon electrodes faces challenges due to electrolyte boiling and spilling during the filling process, causing delays and safety hazards due to the low boiling point of typical electrolyte compositions and the small opening of cylindrical cans.
Innovation Solution
A method involving a cell body with a bottom protrusion and exterior welding grooves, where the electrode assembly is inserted and welded, followed by electrolyte filling through a top opening, and then sealed with a lid assembly that includes a wiper to manage electrolyte and prevent boiling, using vacuum and cooling techniques to maintain the electrolyte below its flash point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrolyte is filled through a small opening in the lid, then the cylindrical can structure is maintained, but the electrolyte boils and spills due to adsorption heat
Solution Approach 1:
The invention divides the filling process into multiple stages: first filling through the side wall opening, then closing it, and finally filling through the top opening. This segmentation allows controlled electrolyte introduction while managing heat generation at each stage, preventing boiling and spilling while maintaining the cylindrical can structure.
Solution Approach 2:
The invention performs preliminary cooling of the electrode assembly before electrolyte filling. This preliminary action reduces the temperature of the microporous carbon electrodes, minimizing the adsorption heat that would otherwise cause electrolyte boiling during the filling process.
2Productivity
If electrolyte filling is performed quickly to improve production rate, then productivity increases, but electrolyte boiling and manufacturing delays occur
Solution Approach 1:
The filling process is segmented into multiple controlled stages rather than a single rapid fill. This allows the process to maintain high overall productivity while ensuring reliability at each stage by preventing electrolyte boiling and the associated manufacturing delays.
Solution Approach 2:
Cooling the electrode assembly before filling is a preliminary action that ensures reliable filling without boiling. This preparatory step enables subsequent faster filling operations to proceed without risk of electrolyte spilling, thus maintaining both productivity and process reliability.
3Object-affected harmful factors
If the electrode assembly is cooled before electrolyte filling, then electrolyte boiling is prevented, but additional manufacturing steps are required
Solution Approach 1:
The cooling step is integrated as a preliminary action in the manufacturing process flow, performed immediately before electrolyte filling. This timing optimization ensures boiling prevention while minimizing the overall impact on process complexity, as the cooling is coordinated with other manufacturing operations.
Solution Approach 2:
The invention introduces a cooling medium as an intermediary between the electrode assembly and the electrolyte filling process. This intermediary step manages the thermal interaction, preventing direct heat transfer issues during filling while keeping the overall process relatively simple through standard cooling techniques.
4Volume of moving object
If a lid with small opening is used to close the cell, then the cell structure is compact, but electrolyte may spill causing safety hazards
Solution Approach 1:
The invention segments the filling operation into two phases: initial filling through the side wall opening, then closing that opening, followed by final filling through the top opening. This segmentation allows the compact lid structure to be maintained while eliminating spilling hazards through controlled filling sequences.
Solution Approach 2:
Cooling the electrode assembly before electrolyte filling is performed as a preliminary action that prevents boiling and spilling. This allows the use of a compact lid with small opening without creating safety hazards, as the thermal conditions are controlled to prevent electrolyte ejection.
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 method reduces manufacturing delays, prevents electrolyte spilling, and enhances safety by efficiently filling the electrolyte while maintaining the electrolyte below its boiling point, thus improving the production rate and handling of supercapacitors.
Implementation Method 1
When coming into contact with the electrode assembly, the electrolyte typically adsorbs to the micropores thereby releasing energy in the form of heat
Implementation Method 2
The cell body and/or the electrode assembly is cooled before and/or during filling of the electrolyte and/or for a predetermined amount of time after filling of the electrolyte
Implementation Method 3
fixing the electrode assembly to the bottom portion in an electrically conductive manner
Data Source
AI summary
A method for manufacturing a current tab member for an electrode assembly of an energy storage cell, e.g., a supercapacitor, the electrode assembly including a negative electrode and a positive electrode, each electrode including a carbon material that includes micropores, and the electrodes being separated by a separator. The current tab member includes a terminal portion. At least one contacting portion is configured to conductively contact the electrode assembly. A heat sink portion is interposed between and adjacent to the terminal portion and the contacting portion.