Sealing Element Design for Wound Solid State Capacitor
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Solution Overview
Problem
Conventional wound-type solid state electrolytic capacitors face issues such as thermal deformation leading to stress and potential damage during soldering, which can result in current leakage and soldering defects due to internal pressure buildup and inadequate gas flow, as well as instability in electrical characteristics from capacitor element swaying within the casing.
Innovation Solution
A sealing element with a cover body featuring an exterior convex portion for stress absorption and an interior convex portion to maintain a gap with the capacitor element, allowing for gas flow and preventing compression-induced damage, thereby enhancing soldering quality and electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is maintained between the capacitor element and the sealing element to prevent compression damage, then the risk of current leakage is reduced, but the capacitor element sways within the casing leading to electrical instability
Solution Approach 1:
The sealing element incorporates different structural zones: a first convex portion that contacts the capacitor element to prevent swaying, and a second convex portion that creates a controlled gap to prevent compression. This local differentiation allows simultaneous achievement of stability and leakage prevention.
Solution Approach 2:
The sealing element acts as an intermediary structure between the capacitor element and the casing wall, providing both contact support (via first convex portion) and gap maintenance (via second convex portion). This mediator role resolves the contradiction by simultaneously enabling both stability and protection.
2Stability of the object's composition
If the end surface of the sealing element directly contacts the circuit board to provide support, then structural stability is improved, but internal pressure during soldering presses the sealing element against the circuit board causing deformation or damage
Solution Approach 1:
The first convex portion of the sealing element is designed to contact the capacitor element beforehand, creating a cushioning effect that prevents direct transmission of soldering pressure to the circuit board. This prior cushioning structure absorbs the harmful pressure during the soldering process.
Solution Approach 2:
The sealing element creates a localized contact point with the capacitor element (via first convex portion) rather than uniform contact with the circuit board. This local quality differentiation allows the sealing element to provide support while isolating the circuit board from thermal pressure.
3Stability of the object's composition
If the end surface of the sealing element contacts the circuit board to provide support, then structural stability is improved, but gas flow during soldering is blocked causing soldering defects
Solution Approach 1:
The sealing element's end surface is segmented into different functional zones: the first convex portion that contacts the capacitor element, and the second convex portion that maintains a gap above the circuit board. This segmentation allows gas flow paths to be preserved while maintaining structural support.
Solution Approach 2:
The sealing element serves as an intermediary that lifts off from the circuit board surface, creating a gap that allows gas flow during soldering. This mediator structure provides support through the first convex portion while permitting gas evacuation through the gap created by the second convex portion.
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 proposed sealing element design effectively absorbs thermal deformation stress, maintains electrical stability by preventing capacitor element swaying, and improves soldering quality by allowing gas flow, reducing the likelihood of current leakage and soldering defects.
Implementation Method 1
an exterior convex portion arranged on the first surface of the cover body, and the exterior convex portion having a first abutting surface arranged at an apex thereof and at least one expansion space
Implementation Method 2
heated electrolytes or polymer material may become volatile gases that can build up pressure inside the capacitor casing 1
Data Source
AI summary
A sealing element of the instant disclosure includes a cover body, an exterior convex portion, and an interior convex portion. The cover body has a first surface, a second surface arranged opposite to the first surface, and a pair of terminal holes formed on the cover body and extending through the first and second surfaces. The exterior convex portion has at least one first abutting surface arranged on the first surface of the cover body and an expansion space formed concavely in the exterior convex portion. The interior convex portion has at least one second abutting surface arranged on the second surface of the cover body. Specifically, the sealing element is configured to prevent the capacitor element from swaying, so that the electrical property of the wound-type solid state electrolytic capacitor with the sealing element can be improved.