A kind of 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 paper and a cathode foil, and an anode foil guide strip is riveted on the anode foil and the cathode foil respectively And the cathode foil guide strip; the cathode foil guide strip includes an aluminum foil base body and a sintered aluminum layer, and the riveted surface of the aluminum foil base body and the cathode foil is sintered with a sintered aluminum layer sintered by aluminum powder or aluminum alloy powder. In the present invention, a layer of sintered aluminum layer is sintered on the foil guide strip, and after the foil guide strip is riveted to the pole foil, the sintered aluminum layer is embedded on the pole foil, so compared with the traditional foil guide strip, the sintered aluminum layer is embedded in the pole foil. There are more contact points with the pole foil after riveting, and the metal plasticity of sintered aluminum is better than that of the traditional foil guide strip, so that the foil guide strip of the present invention is more closely combined with the pole foil, and the conductive foil between the foil guide strip and the pole foil is conductive. The channels are larger and therefore more resistant to ripple current.

Description

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

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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