Embedded type wiring terminal sealing cover for large aluminium electrolytic capacitors

Abstract

Disclosed is an embedded type wiring terminal sealing cover for large aluminium electrolytic capacitors, wherein an insulating material which is identical with a terminal cover and integrated with an insulating terminal block is used for coating a naked positive wiring terminal post and a naked negative wiring terminal post respectively or integrally, or the wiring terminal posts are embedded into the insulating material body of the cover, so that the distance between the positive wiring terminal post and the negative wiring terminal post in the insulating material is reduced, the area of a loop is reduced, the equivalent series inductance (ESL) value is reduced, and at the same time, the risk that the positive pole and the negative pole are short-circuited caused by an electrolyte splashed during release of a pressure valve is eliminated.

Description

Technical field: [0001] The invention relates to a sealing terminal cover plate with low inductance and anti-short circuit function for large aluminum electrolytic capacitors. Background technique: [0002] Large-scale aluminum electrolytic capacitors are composed of a core package composed of inner positive and negative aluminum foils and electrolytic paper curls, an outer cylindrical aluminum shell, and a sealing cover plate with positive and negative terminals. The positive and negative aluminum foils that are crimped to form the core package and the corresponding positive and negative terminals on the inside of the sealing cover are connected with aluminum lead-out bars. [0003] In order to prevent the capacitor from being extremely damaged under overload conditions such as overvoltage and overcurrent, there is an internal pressure release guide hole, that is, an explosion-proof valve or a pressure valve, on the sealed terminal cover plate far from the terminal post, us...

AI Technical Summary

Problems solved by technology

When the pressure valve is activated to release the pressure, the electrolytic solution charged with the negative electrode will splash out from the pressure release port, so the capacitor has a very high risk of positive and negative short circuit

Moreover, in order to prevent creepage between the positive and negative terminals, it is usually necessary to set an anti-creepage safety distance of about 10mm between the positive and negative terminal posts according to the operating voltage, which increases the loop space and increases the capacitor's load. Effective Series Inductance (ESL) Value

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