Solid Electrolytic Capacitor Anode Connection for Higher Volumetric Density
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Solution Overview
Problem
There is a demand for improving the volumetric density (capacitance per unit volume) of solid electrolytic capacitors.
Innovation Solution
A production method for a solid electrolytic capacitor involves connecting an anode connecting member made of a metal that is not a valve metal to the anode lead-out portion of the capacitor element, forming an exterior body to cover the element and the connecting member, exposing a surface of the connecting member as a connecting surface by removing part of the exterior body, and connecting an anode lead terminal to this surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the exterior body volume is reduced to improve volumetric density, then the capacitance per unit volume increases, but the connection reliability between lead terminal and capacitor element may deteriorate
Solution Approach 1:
The connection structure is divided into multiple segments: the anode lead-out portion extends from the capacitor element, the connecting member provides an intermediate connection point, and the lead terminal connects to the exposed surface. This segmentation allows the exterior body to be minimized while maintaining reliable electrical connection through the distributed connection points.
Solution Approach 2:
The connecting member acts as an intermediary between the anode lead-out portion and the lead terminal. It provides a stable connection interface that is exposed through the exterior body, ensuring reliable electrical connection while allowing the exterior body volume to be minimized for improved volumetric density.
2Quantity of substance
If the exterior body volume is minimized to increase volumetric density, then the capacitor size decreases, but the ease of manufacturing and assembly may worsen
Solution Approach 1:
The anode lead-out portion is preliminarily formed extending from the capacitor element during the capacitor element manufacturing process. The connecting member is pre-positioned and connected to this lead-out portion before the exterior body is formed. This preliminary arrangement simplifies the subsequent exterior body formation process and facilitates easy assembly of the lead terminal to the exposed connecting member surface.
Data Source
AI summary
A production method is a production method for a solid electrolytic capacitor including at least one solid electrolytic capacitor element including a cathode portion and an anode portion including an anode lead-out portion. The production method includes: a step (i) of connecting one anode connecting member made of a metal that is not a valve metal to the anode lead-out portion of the at least one solid electrolytic capacitor element; a step (ii) of forming an exterior body to cover the at least one solid electrolytic capacitor element and at least a part of the anode connecting member; a step (iii) of exposing the surface of a part of the anode connecting member on the exterior body as a connecting surface by removing a part of the exterior body; and a step (iv) of connecting the anode lead terminal to the connecting surface.