Vacuum heat treatment method for thin-film capacitor core

Abstract

The invention discloses a vacuum heat treatment method for a thin-film capacitor core. The method comprises the following steps: sleeving the positions, close to two ends, of the thin-film capacitor core, with insulating high-temperature-resistant rubber rings; arranging the thin-film capacitor core in a core tank body and sealing the thin-film capacitor core through a tank cover; vacuumizing the core tank body by adopting a vacuum pump; placing the core tank body in a drying oven, wherein air is contained in the drying oven; setting a heating program of the drying oven, then starting the drying oven, and performing heat treatment according to a preset temperature; after the procedure of heat treatment via the drying oven is completed, taking out the thin-film capacitor core, and removing the rubber rings so as to complete vacuum heat treatment of the thin-film capacitor core. According to the invention, the local heating uniformity of each part of the thin-film capacitor core is obviously improved, the shrinkage of the capacitor is consistent, the air gap and internal stress of the capacitor are improved, the voltage resistance and charge-discharge capacity of the capacitor are obviously improved, the service life of the capacitor is prolonged, and the vacuum pump for vacuumizing is small in power and low in noise, and is beneficial to energy conservation and noise reduction.

Description

technical field [0001] The invention relates to a processing method for a film capacitor core, in particular to a vacuum heat treatment method for a film capacitor core. Background technique [0002] With the development of modern science and technology, the replacement cycle of electronics, home appliances, communications and other industries is getting shorter and shorter. With its good electrical performance and high reliability, metallized film capacitors have become indispensable electronic components to promote the upgrading of the above industries, and are widely used in aviation, aerospace, weaponry and other military fields. In recent years, with the further development of digitization, informatization, and network construction, the country’s increased investment in power grid construction, electrified railway construction, energy-saving lighting, hybrid vehicles, etc., and the upgrading of consumer electronics products, film capacitors, especially The application ...

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Problems solved by technology

[0005] 1. The air in the vacuum oven is thin and there is no air convection. The oven mainly relies on radiation heating to raise the temperature. The temperature difference between different positions in the oven is large, and the capacitor core is directly stacked in the vacuum cavity. Different parts of the capacitor core are heated unevenly. The shrinkage is inconsistent, and there are air gaps and stresses inside the product, which increases the air gap and internal stress of the product, reduces the withstand voltage capability and charge and discharge capacity of the capacitor, and reduces the service life of the capacitor

[0006] 2. The cavity of the oven is too large, the power of the vacuum pump required is large, the production noise is large, the degree of vacuum is relatively difficult to achieve, the efficiency is not high and the energy consumption is large

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