Working electrolyte solution of 800 V aluminum electrolytic capacitor and preparation method of working electrolyte solution

Abstract

The invention discloses a working electrolyte solution of an 800 V aluminum electrolytic capacitor. The working electrolyte solution comprises, by weight, 30%-65% of main solvent, 10%-35% of auxiliary solvent, 5%-25% of solute, 5%-15% of spark voltage improver and 1.5%-3.5% of additives. The invention further discloses a preparation method of the working electrolyte solution. The working electrolyte solution makes a 700 V-750 V superhigh voltage technical breakthrough and can directly reach the 800 V superhigh voltage technical field, and the working electrolyte solution has the advantages of being high in working voltage, long in service life, stable in performance under a high temperature environment, good in pressure resistance of products, good in gas production performance and the like.

Description

technical field [0001] The invention relates to the technical field of ultra-high voltage aluminum capacitors for new energy sources, in particular to a working electrolyte for an 800V aluminum electrolytic capacitor and a preparation method thereof. technical background [0002] With the development of science and technology, the improvement of social needs, the improvement of the environment, and the birth of new complete machines, the trend of miniaturization, chip type, medium and high voltage and large capacity of aluminum capacitors has developed. Recently, many well-known brand capacitor manufacturers such as Japan, which are at the forefront of the world, have developed in the aspect of aluminum capacitors that tend to be ultra-high voltage (rated voltage above 600V). Products, and most of their new series of products are in the field of ultra-high voltage, from which we can conclude that ultra-high voltage aluminum capacitors are a development trend in the future. ...

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Problems solved by technology

[0003] At present, high-voltage and large-capacity aluminum capacitors are generally used in the field of industrial frequency conversion. Many frequency conversion equipment circuit voltages are relatively high (some are above 1000V), and the general working voltage of high-voltage products of many domestic aluminum capacitor manufacturers can only meet 400V ~ 450V. There are very few products above 500V, so many manufacturers in the electronics industry have to connect aluminum capacitors in series. This will cause three problems: First, the connection of aluminum capacitors in series makes the overall volume of the whole machine become larger, it is impossible to realize the miniaturization of the whole machine; the second is that the aluminum capacitors are connected in series, and the heat dissipation effect on the circuit board is greatly reduced. The third is that aluminum capacitors are connected in series, and each aluminum capacitor product in series is also different in performance and service life. Aluminum capacitors with poor quality will fail early, which will affect other aluminum capacitors and components. Therefore, it is very necessary to increase the rated working voltage of aluminum capacitors and replace several low-voltage aluminum capacitors with a high-voltage aluminum capacitor, regardless of the space layout of circuit design, heat dissipation, and stability of equipment performance.

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