Solid Electrolytic Capacitor Electrode Layout for Low ESL
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Solution Overview
Problem
Existing solid electrolytic capacitors face limitations in increasing capacitance due to space occupation by anode common terminals, which hinder the reduction of equivalent series inductance (ESL).
Innovation Solution
The electrolytic capacitor design includes an anode body with a porous part and a dielectric layer covered by a solid electrolyte layer, with external electrodes separated along the principal surfaces of a rectangular parallelepiped exterior body, allowing for alternate stacking and reduced separation distances between electrodes, thereby minimizing ESL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anode common terminals are used to join anode electrode parts, then the capacitor structure is stabilized, but the equivalent series inductance (ESL) increases and capacitance is reduced
Solution Approach 1:
The patent removes the anode common terminal component from the capacitor structure. Instead of using separate terminals to join anode electrode parts, the anode electrodes are directly connected to external electrodes through the exterior body, eliminating the additional inductive path and reducing ESL while maintaining structural stability
Solution Approach 2:
The patent changes the spatial arrangement by disposing anode and cathode external electrodes along the same principal surface rather than separating them across opposite surfaces. This dimensional reorganization reduces the separation distance and optimizes current paths to minimize inductance
2Object-generated harmful factors
If external electrodes are disposed along the first principal surface to be separated, then the ESL is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent disposes both anode and cathode external electrodes along the first principal surface of the exterior body rather than on opposite surfaces. This planar arrangement reduces separation distance and ESL while simplifying the manufacturing process by enabling more straightforward electrode placement and connection operations
Solution Approach 2:
The patent integrates the external electrode connections to be made along the same surface, merging the connection operations into a more compact and manufacturable configuration that reduces both ESL and manufacturing complexity
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
This design achieves high capacitance while maintaining a low ESL by optimizing electrode placement and alternating current directions within the capacitor elements, effectively reducing magnetic flux and electrode separation distances.
Implementation Method 1
a dielectric layer that is formed on a surface of at least a part of the porous part
Implementation Method 2
a solid electrolyte layer that covers at least a part of the dielectric layer, and is electrically connected to the second external electrode
Data Source
AI summary
An electrolytic capacitor includes a capacitor element, an exterior body, a first external electrode, and a second external electrode. The capacitor element includes an anode body that is electrically connected to the first external electrode and has a porous part on a surface thereof, a dielectric layer that is disposed on a surface of at least a part of the porous part, and a solid electrolyte layer that covers at least a part of the dielectric layer, and is electrically connected to the second external electrode. The exterior body has a first principal surface, a second principal surface intersecting the first principal surface, a third principal surface opposite to the first principal surface, and a fourth principal surface opposite to the second principal surface. The first external electrode and the second external electrode are disposed along the first principal surface of the exterior body to be separated from each other.