Aluminum Electrolytic Capacitor Core Package for Low-ESR Foil Connection
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Solution Overview
Problem
The performance of aluminum electrolytic capacitors is not achieved effectively due to the capacitance extraction structure in square aluminum electrolytic capacitors, where direct connection between conductive foil strips and anode foils is difficult, leading to structural damage and heat issues.
Innovation Solution
A core package design with laminated first and second electrode foils, where conductive foils are used to connect the electrode foils to conductive foil strips, forming an oxide film to prevent heat accumulation, and the foils are arranged with electrolytic paper to ensure effective isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a direct connection structure between conductive foil strip and anode foil is used, then the device complexity is reduced, but the anode foil structure is damaged and heat accumulation occurs
Solution Approach 1:
The patent introduces a conductive foil as an intermediary component between the conductive foil strip and the anode foil. This conductive foil acts as a mediator that enables electrical connection without direct contact between the conductive foil strip and anode foil, thereby preventing structural damage to the anode foil while maintaining electrical conductivity and reducing heat accumulation at connection points.
2Ease of manufacture
If conventional capacitance extraction structure is used, then manufacturing is simplified, but performance requirements cannot be achieved
Solution Approach 1:
The patent segments the capacitance extraction function into multiple components: the anode foil with its oxide film layer, the conductive foil, and the conductive foil strip. This segmentation allows each component to perform its specific function optimally - the anode foil provides capacitance, the conductive foil enables connection without damage, and the strip provides external electrical connection - thereby achieving both manufacturing simplicity and performance requirements.
3Area of stationary object
If direct connection between conductive foil strip and anode foil is implemented, then connection area is reduced, but equivalent series resistance increases due to current accumulation
Solution Approach 1:
The conductive foil serves as an intermediary that increases the effective connection area between the conductive foil strip and anode foil. By introducing this intermediate layer, the current distribution is improved and connection area is expanded, which directly reduces the equivalent series resistance and minimizes energy loss through current accumulation.
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 solution ensures stable and effective capacitance extraction, reduces equivalent series resistance, and prevents heat issues due to current accumulation, thereby enhancing the overall performance of aluminum electrolytic capacitors.
Implementation Method 1
An oxide film is formed on a surface of the first conductive foil
Implementation Method 2
the first electrode foil and the second electrode foil adjacent to each other are spaced by an electrolytic paper
Data Source
AI summary
The present disclosure provides a core package, an aluminum electrolytic capacitor and a packaging method thereof. The core package includes a plurality of first electrode foils and second electrode foils laminated one on another, each of the first electrode foils is an anode foil or a cathode foil, and the second electrode foil is the other. Among the plurality of first electrode foils, a first conductive foil is arranged at the edge of each of the first electrode foils, a first portion of the first conductive foil is electrically coupled to the corresponding first electrode foil, and a second portion of the first conductive foil extends and protrudes relative to the corresponding first electrode foil; and the plurality of first conductive foils are connected to a first conductive foil strip through the second portion; and an oxide film is formed on a surface of the first conductive foil.