Solid Electrolytic Capacitor Anode Terminal Trapezoidal Design
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Solution Overview
Problem
Existing chip-type solid electrolytic capacitors face challenges in increasing the mounting area and volume efficiency, leading to degraded self-alignment and welding strength due to restrictive terminal configurations.
Innovation Solution
A solid electrolytic capacitor design featuring an anode terminal with a mounting portion and an upright portion, where the edge length on the anode wire side is longer than on the mounting portion side, and the upright portion has a trapezoidal shape, allowing for improved self-alignment and welding strength by increasing the mounting area and accommodating various anode wire shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the flat plate of the anode terminal is positioned only on the opposite side of the capacitor element relative to the rise portion, then the structure is simple, but the mounting area cannot be increased and volume efficiency is reduced
Solution Approach 1:
The anode terminal structure transitions from a conventional configuration where the flat plate is only on one side to a three-dimensional structure where the flat plate extends on both sides of the capacitor element. This dimensional change allows the mounting area to be increased without proportionally increasing the overall volume, thereby improving volume efficiency while providing sufficient mounting area.
2Area of stationary object
If the terminal portion extends on the capacitor element side, then the mounting area is increased, but the rise portion formed by raising a cut-in portion with rectangular shape degrades self-alignment property
Solution Approach 1:
The rise portion is designed with an asymmetric trapezoidal cross-section where one lateral surface is inclined at a specific angle (e.g., 45 degrees) relative to the longitudinal axis, while the other lateral surface has a different configuration. This asymmetric geometry provides directional guidance during mounting, significantly improving self-alignment properties while maintaining the extended mounting area benefit.
3Strength
If the edge length of the upright portion on the anode wire side is made longer, then welding strength is improved, but the overall terminal size increases
Solution Approach 1:
The upright portion concentrates its functional qualities locally: the edge length on the anode wire side is extended specifically to enhance welding strength and provide adequate welding surface area, while the edge length on the mounting portion side is optimized for mounting requirements. This localized differentiation of dimensions ensures that each part of the terminal performs its specific function optimally without unnecessary overall size increase.
Data Source
AI summary
A solid electrolytic capacitor includes: a capacitor element including a sintered compact of a valve action metal, a dielectric layer, an electrolyte layer, and a cathode layer sequentially formed over a surface of the sintered compact, and an anode wire drawn out of the sintered compact; an anode terminal; a cathode terminal; and an exterior resin. The anode terminal includes a mounting portion and an upright portion. The upright portion has a trapezoidal shape. A length of a welding surface corresponding to an edge of the upright portion on the anode wire side is set to be longer than a length of the upright portion on the mounting portion side and to be longer than a width of the anode wire.