Supercapacitor Guide Pin Polymer Coating Against Alkali Creep
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Solution Overview
Problem
Conventional supercapacitors experience alkali creep at the negative electrode, leading to leakage and corrosion issues due to the formation of highly basic substances on the metal surface.
Innovation Solution
A supercapacitor design that includes a polymer coating on at least part of the surface of the aluminum stem in the guide pin of the negative electrode, which slows down the movement of alkaline substances and prevents alkali creep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional guide pin structure without polymer coating is used, then the manufacturing process is simple, but alkali creep occurs and causes leakage and corrosion
Solution Approach 1:
A polymer coating is introduced as an intermediary substance between the aluminum stem and the alkaline environment. This coating layer acts as a barrier that prevents direct contact between the alkaline substances and the metal surface, thereby suppressing alkali creep while maintaining the原有 guide pin structure.
Solution Approach 2:
The polymer coating forms a thin film on the surface of the aluminum stem in the guide pin. This flexible protective film effectively blocks the migration of alkaline substances along the metal surface without adding significant structural complexity to the guide pin assembly.
2Ease of manufacture
If the aluminum stem surface is exposed, then the guide pin structure is simple, but alkaline substances move easily causing corrosion at solder joints
Solution Approach 1:
The polymer coating serves as a protective intermediary that shields the aluminum stem and surrounding areas from alkaline substances. This prevents the formation of highly basic environments at the solder joints, eliminating the corrosion hazard while requiring only a simple coating step in manufacturing.
3Productivity
If no protective coating is applied, then the manufacturing process is straightforward, but basic substances form conductive alkaline solution causing short circuit
Solution Approach 1:
The polymer coating forms a continuous protective film over the aluminum stem surface, preventing alkaline substances from forming conductive solutions. This thin film barrier effectively blocks the pathway for short circuit formation while adding minimal processing steps to the manufacturing workflow.
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 polymer coating effectively suppresses alkali creep in the supercapacitor, preventing leakage and corrosion, and maintaining the integrity of the capacitor over extended periods, such as 4,000 hours at 65° C. and a constant voltage of 2.7 V.
Implementation Method 1
at least part of the surface of an aluminum stem, located in the through hole, in the guide pin of the negative electrode is covered with a polymer coating... the movement of alkaline substances on the aluminum surface is slowed
Data Source
AI summary
The present application discloses a supercapacitor. The supercapacitor comprises: a capacitor element comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; an electrolyte impregnating the capacitor element; a housing for accommodating the capacitor element and the electrolyte; and a sealing member for sealing an opening portion of the housing, the sealing member being provided with a through hole for respectively allowing a guide pin of the positive electrode and a guide pin of the negative electrode to be inserted in, wherein at least part of the surface of an aluminum stem, located in the through hole, in the guide pin of the negative electrode is covered with a polymer coating. The present application further discloses a method for forming the supercapacitor and a use of the polymer coating coated on the surface of the aluminum stem in the guide pin of the negative electrode in suppressing alkali creep of the negative electrode in the supercapacitor.