Aluminum electrolytic capacitor and preparation method thereof

Abstract

An aluminum electrolytic capacitor comprises a shell and a core package; the core package is sealed in the shell, the core package is formed by winding or folding an anode foil, an electrolytic paperand a cathode foil, and an anode foil guide strip and a cathode foil guide strip are riveted to the anode foil and the cathode foil respectively; the cathode foil guide strip comprises an aluminum foil substrate and a sintered aluminum layer; the sintered aluminum layer sintered by aluminum powder or aluminum alloy powder is sintered on the riveted surface of the aluminum foil substrate and the cathode foil. In the present invention, the sintered aluminum layer is sintered on the foil guide strip; when the foil guide strip is riveted on the pole foil, the sintered aluminum layer is embedded into the pole foil; thus, compared with a traditional foil guide strip, the number of contact points between the foil guide strip and the pole foil is larger after riveting, and the metal plasticity ofsintered aluminum is better than that of the traditional foil guide strip; the foil guide strip and the pole foil are combined more tightly, a conductive channel between the foil guide strip and the pole foil is larger, and therefore the ripple current resistance is higher.

Description

technical field [0001] The invention relates to an aluminum electrolytic capacitor, in particular to an aluminum electrolytic capacitor resistant to ripple current and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors are electronic components that have been widely used and have been used for a long time. In aluminum electrolytic capacitors, the polarity on the pole foil can be drawn out by guide pins or by guide foil strips. When using the chaff strip to lead out the polarity of the polar foil, the chaff strip is riveted on the cathode foil or the anode foil. Since the chaff strip and the pole foil are both flat, the gap between the chaff strip and the pole foil after riveting is The electrical connection channel between them is still not large. In some scenarios that have relatively high requirements for ripple current resistance, this kind of riveting, whether it is pressure riveting or thorn riveting, does not meet the requireme...

AI Technical Summary

Problems solved by technology

When using the chaff strip to lead out the polarity of the pole foil, the chaff strip is riveted on the cathode foil or the anode foil. Since the chaff strip and the pole foil are both planar in this connection, the gap between the chaff strip and the pole foil will The electrical connection channel between them is still not large. In some scenarios that have relatively high requirements for ripple current resistance, this kind of riveting, whether it is pressure riveting or thorn riveting, does not meet the requirements.

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