Preparation method of high-voltage aluminum electrolytic capacitor, and capacitor

Abstract

The invention discloses a preparation method of a high-voltage aluminum electrolytic capacitor, and the capacitor. The method comprises the following steps: a material slitting step: cutting a raw material to a specified size of the capacitor; a riveting and rolling step: rolling the cut raw material into a core of the capacitor on a riveting and rolling machine table; a drying step: carrying out drying treatment on the coiled core; an impregnation step: soaking the dried core in a liquid electrolyte; an assembling and sealing step: adding materials such as an aluminum shell, a cover plate and the like to the impregnated core, riveting positive and negative electrode guide foil strips of the core with a cover plate leading-out positive electrode leading-out terminal and a cover plate leading-out negative electrode leading-out terminal respectively, then allowing an assembled product to pass through a curling machine, conducting sealing and forming, and forming a sealed space in the capacitor to realize isolation from the outside; a sleeving step: sleeving the sealed and formed capacitor with a plastic sleeve; an aging step; etc.

Description

technical field [0001] The invention belongs to the technical field of electrical appliances, and in particular relates to a preparation method of a high-voltage aluminum electrolytic capacitor and the capacitor. Background technique [0002] Capacitors are the most critical components in electrical appliances, especially in today's era where technology is becoming more and more developed and highly intelligent, capacitors are already essential components in electrical appliances. Aluminum electrolytic capacitors are the most special type of capacitors in the capacitor family. High intelligence, miniaturization, and high power are all inseparable from aluminum electrolytic capacitors. [0003] Traditional aluminum electrolytic capacitors are divided into low voltage, medium voltage and high voltage, and generally the highest rated voltage is 450VDC. In recent years, with the rapid rise of energy saving, environmental protection, and new energy, the corresponding internal mo...

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Problems solved by technology

[0004] At present, the rated voltage of aluminum electrolytic capacitors has been used in electrical appliances such as 500V, 550V and other ultra-high voltage products, but aluminum electrolytic capacitors with voltages above 600V are still not mature technically.

On the use side, because the voltage is too high, it often takes 2, or 3, or even more products in series to meet the required voltage requirements. The more capacitors connected in series, the greater the impact of unfavorable factors, the most important of which are : 1) If the voltage of the module is not too high, such as within 500V, 550V, 600V, etc., if a single capacitor is used, the rated withstand voltage is insufficient, and if more than 2 capacitors are used in series, the design may be excessive; 2) When there is a higher voltage If used in a module, multiple capacitors may be used in series. Due to the factors of the capacitor itself and the differences in the parameters of the aluminum electrolytic capacitors, the voltage division will be uneven. Higher voltage products may exceed the rated voltage withstand capacity, resulting in short-term failure or shortened life; 3) The stability of the module is reduced, and the capacitors are connected in series. As long as one of the capacitors fails, the entire module will fail; If the voltage is sufficient, all of them are connected in parallel. If one of the capacitors fails, the whole module may still work, but the output power is reduced.

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