Solid Electrolytic Capacitor Side-Wall Cathode for Lower Impedance
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Solution Overview
Problem
Conventional surface mount capacitors face challenges in manufacturing complexity and noise filter characteristics, particularly in the design of transmission line type noise filters.
Innovation Solution
A solid electrolytic capacitor design with a cathode terminal featuring a side wall and multiple anode terminals, integrated through a manufacturing process involving cutting, bending, and molding, to enhance electrical connections and reduce impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface mount capacitors are designed as transmission line type noise filters, then noise filter characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The cathode terminal is integrated with the cathode part of the capacitor elements, merging the terminal structure with the capacitor body. This integration eliminates the need for separate terminal components and simplifies the manufacturing process while maintaining the transmission line type noise filter characteristics
Solution Approach 2:
The cathode terminal extends in the stacking direction (vertical dimension) rather than only in the horizontal plane, creating a three-dimensional structure that achieves transmission line noise filtering effects without increasing planar complexity or requiring additional manufacturing steps
2Reliability
If multiple capacitor elements are stacked to improve electrical connections, then impedance reduction is achieved, but device complexity increases
Solution Approach 1:
Multiple capacitor elements are stacked and electrically connected through the integrated cathode terminal structure, merging the electrical connection function into the terminal itself rather than requiring separate connection components, thereby reducing impedance without increasing overall device complexity
Solution Approach 2:
The capacitor is divided into multiple stacked capacitor elements, each contributing to the overall electrical connection. This segmentation allows for improved current distribution and reduced impedance while maintaining a compact structure through the integrated terminal design
Data Source
AI summary
A solid electrolytic capacitor includes: a plurality of capacitor elements stacked on each other, each of the plurality of capacitor elements including an anode body and a cathode part; two anode terminals electrically connected to the anode body; a cathode terminal electrically connected to the cathode part; and an outer packaging resin. The anode body has two protrusions respectively protruding from both ends of the cathode part. Each of the two protrusions is electrically connected to a corresponding one of the two anode terminals. The two protrusions in each of the plurality of capacitor elements are electrically connected to each other. The cathode terminal includes a mounting surface exposed from the outer packaging resin, and a side wall rising continuously from the mounting surface and electrically connected to a side surface of the cathode part.