Welding process of film capacitor

Abstract

The invention discloses a welding process of a thin-film capacitor. The welding process comprises the steps of pretreatment of a lead, flattening of the lead, treatment of a welding part, welding of the lead, welding of a core end surface, test detection and the like. Compared with a traditional welding process, the welding process has the following advantages that the welding process has multipleadvantages; flattening the lead welded on the metal spraying surface; welding to the end surface of the core; damage to the end face of the core in the welding process is reduced. Therefore, the ESRvalue change of the product is small; Meanwhile, the contact area of the lead and the metal spraying surface of the product is increased, the welding effect of the lead and the end surface is more obvious and more stable, the consistency of product welding is ensured, the welding depth of the lead is reduced when the lead is welded to the metal spraying surface, the damage to a core end surface film is reduced, and thus the ESR value of the product is stable.

Description

technical field [0001] The invention relates to the technical field of film capacitors, in particular to a welding process for film capacitors. Background technique [0002] The DF value of film capacitors has always been an important parameter of the electrical performance of the capacitor, and the size of the DF value reflects the size of the ESR of the capacitor product. The quality of the welding process is the key position that affects the DF value of the product. If the welding process is not well controlled, it is easy to Cause the defective rate to be too high or appear defective when the customer uses. [0003] The existing welding method is generally to directly weld the lead wire on the gold-sprayed surface, and then weld it on the end face of the core. Since the lead wire is cylindrical, in order to ensure the firmness of the lead wire, the welding depth between the lead wire and the gold-sprayed surface will be increased during welding. , At the same time, it w...

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Problems solved by technology

[0002] The DF value of film capacitors has always been an important parameter for the electrical performance of capacitors, and the DF value reflects the size of the ESR of the capacitor product. The quality of the welding process is the key position that affects the DF value of the product. If the welding process is not well controlled, it is easy to The defect rate is too high or the customer has a defect when using it

[0003] The existing welding method is generally to directly weld the lead wire on the gold-sprayed surface, and then weld it on the end face of the core. Since the lead wire is cylindrical, in order to ensure the firmness of the lead wire, the welding depth between the lead wire and the gold-sprayed surface will be increased during welding. , it will also increase the damage to the core film, which will make the ESR value of the product unstable

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