Electrochemical Element Insulating Coating Sealing Integrity
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Solution Overview
Problem
The insulating coating material used in electrochemical elements to protect the positive electrode lead from damage and short circuits interferes with the sealing properties of the laminate-film jacket, leading to a deterioration in the sealing ability at the welded portions.
Innovation Solution
Incorporating a sheet-like laminate-film jacket with a welded peripheral portion that pinches the positive and negative terminals, and using a sealing material with insulating properties to coat these terminals, while strategically placing bending portions to prevent the insulating material from interfering with the sealing process, thereby maintaining the integrity of the laminate-film jacket's sealing ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating coating material is applied to the positive electrode lead to prevent damage and short circuits, then the reliability of the electrode lead is improved, but the sealing property of the laminate-film jacket deteriorates at the welded portion
Solution Approach 1:
The patent extracts the insulating coating material from the welded portion area by controlling its application range. The insulating coating is applied only to the positive electrode lead in regions away from the welded portion, deliberately excluding the welding area to prevent interference with the sealing process while maintaining protection in other critical areas.
Solution Approach 2:
The patent applies different treatments to different regions: the positive electrode lead receives insulating coating in non-welded areas for protection, while the welded portion remains free of insulating material to ensure proper sealing. This localized differentiation resolves the contradiction between protection and sealing quality.
2Manufacturing precision
If the laminate-film jacket pinches the positive electrode lead at the welded portion for sealing, then the sealing ability is improved, but the positive electrode lead may break or cause short circuits
Solution Approach 1:
The patent removes the insulating coating material from the specific region where the laminate-film jacket pinches the positive electrode lead at the welded portion. This extraction allows the jacket to directly contact and secure the lead without the coating interfering, preventing lead breakage while maintaining sealing integrity in the critical welding zone.
Solution Approach 2:
Instead of applying insulating coating uniformly to protect the lead, the patent inverts the approach by deliberately creating a coating-free zone at the welded portion where the lead is most vulnerable to pinching, while maintaining coating elsewhere for protection. This inverted strategy prioritizes mechanical integrity at the critical sealing point.
Data Source
AI summary
[Problem] The present invention provides an electrochemical element having an electrode body covered with a laminate-film jacket; the electrochemical element is structured to prevent damage and short-circuiting of a positive electrode lead while making it possible to prevent decreased sealing ability of the laminate-film jacket.[Solution] A laminate-type cell 1 includes: an electrode body 10; a positive terminal 41; a laminate-film jacket 20; a positive electrode sealing material 45 located between the positive terminal 41 and the laminate-film jacket 20; and an insulating material 55. The positive terminal 41 and the positive electrode sealing material 45 include a plurality of bending portions 51a, 51b inside the laminate-film jacket 20. The insulating material 55 coats a part of the positive electrode sealing material 45 near the electrode body 10. The positive electrode sealing material 45 includes a positive-electrode insulated portion 51c coated with the insulating material 55 and a positive-electrode welded portion 51d pinched by the laminate-film jacket 20.