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CN-224217335-U - Copper-clad aluminum structure for inductor connecting terminal

CN224217335UCN 224217335 UCN224217335 UCN 224217335UCN-224217335-U

Abstract

The utility model relates to the technical field of inductor terminals, in particular to a copper-clad aluminum structure for an inductor connecting terminal. The utility model comprises a connecting terminal and a copper-clad aluminum structure processed at the tail end of the connecting terminal, wherein the copper-clad aluminum structure is sequentially provided with a wrapping layer and a solid layer from outside to inside, and the joint of the wrapping layer and an insulating paint layer bulges outwards to form a raised step. The utility model inserts the part of the end of the solid layer which is not coated with the insulating paint into the copper sleeve, and the wrapping layer extrudes part of the insulating paint layer to form the extrusion layer which is obliquely wrapped outside the solid layer, so that the wrapping is tight, the corrosion of the external environment is effectively isolated, the wrapping layer is tightly contacted with the solid layer, the conductivity is good, the copper surface which can be directly welded is provided, and the weldability of the terminal is improved.

Inventors

  • JIANG ZHIBIN
  • GONG SONGTAO

Assignees

  • 青岛云路新能源科技有限公司

Dates

Publication Date
20260508
Application Date
20250521

Claims (6)

  1. 1. The copper-clad aluminum structure for the inductor connecting terminal is characterized by comprising a connecting terminal and a copper-clad aluminum structure processed at the tail end of the connecting terminal, wherein a wrapping layer (1) and a solid layer (2) are sequentially arranged on the copper-clad aluminum structure from outside to inside, an insulating paint layer (3) is sleeved on the solid layer (2), a joint of the wrapping layer (1) and the insulating paint layer (3) bulges outwards to form a protruding step (5), and the wrapping layer (1) extrudes part of the insulating paint layer (3) to form an extrusion layer (4) obliquely wrapped outside the solid layer (2).
  2. 2. The copper-clad aluminum structure for an inductor connecting terminal according to claim 1, wherein the wrapping layer (1) is a sleeve made of copper, the wrapping layer (1) is wrapped around the whole circumference from the end of the solid layer (2) to be sleeved in and extruded with a part of the insulating paint layer (3) to form an extrusion layer (4), and the covering area of the wrapping layer (1) comprises the end of the solid layer (2) and the extrusion layer (4).
  3. 3. The copper-clad aluminum structure for the inductor connecting terminal according to claim 1, wherein the solid layer (2) is an aluminum wire with a circular or flat cross section, the end of the solid layer (2) is exposed outside for a certain length, and the surface of the rest part is provided with an insulating paint layer (3).
  4. 4. Copper-clad aluminum structure for inductor connecting terminals according to claim 1, characterized in that the periphery of the wrapping layer (1) is processed with at least one circle of reinforcing indentations (6), and the reinforcing indentations (6) are grooves arranged at intervals on the outer side of the extrusion layer (4).
  5. 5. Copper clad aluminum structure for inductor connecting terminal according to claim 4, characterized in that the reinforcing indentation (6) forms a wave-like reinforcing structure on the inner wall of the wrapping layer (1), and forms a pre-tightening force for the extrusion layer (4) and the inner solid layer (2).
  6. 6. The copper-clad aluminum structure for inductor connecting terminals according to claim 1, wherein the joint of the raised steps (5) is coated with a sealant or rust preventive oil.

Description

Copper-clad aluminum structure for inductor connecting terminal Technical Field The utility model relates to the technical field of inductor terminals, in particular to a copper-clad aluminum structure for an inductor connecting terminal. Background If the inductor connecting terminal adopts pure aluminum wires, the pins of the inductor connecting terminal have the difficult problem of welding. Because the surface of the pure aluminum wire can form a compact oxide film (Al 2O3), the melting point of the oxide film is up to 2050 ℃ and is far higher than that of wave soldering solder at 232 ℃, the solder cannot be effectively infiltrated, the falling rate of the solder joint is up to 20%, the welding performance is poor, and the end part of the existing copper-clad aluminum structure is in an open state, and electrochemical corrosion can be caused at the end part. In the prior art, as disclosed in Chinese patent publication No. CN218997102U, a copper layer is wrapped at the tail end of an aluminum wire to prepare a copper-aluminum composite structure. However, such copper-clad aluminum structures still present challenges in practical applications. At present, most binding post surfaces have insulating paint layer, and how to properly handle the connection structure of parcel layer and insulating paint layer to and the protection work of joint department is done, avoids appearing the poor, insulation failure scheduling problem, all is the key that needs to solve to ensure the reliability of product. Disclosure of utility model The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing a copper-clad aluminum structure for an inductor connecting terminal. The technical scheme adopted by the utility model is as follows: The copper-clad aluminum structure for the inductor connecting terminal comprises a connecting terminal and a copper-clad aluminum structure processed at the tail end of the connecting terminal, wherein a wrapping layer and a solid layer are sequentially arranged on the copper-clad aluminum structure from outside to inside, an insulating paint layer is sleeved on the solid layer, the joint of the wrapping layer and the insulating paint layer bulges outwards to form a raised step, and the wrapping layer extrudes part of the insulating paint layer to form an extrusion layer obliquely wrapped outside the solid layer. The technical scheme is that the copper-clad aluminum structure special for the inductor connecting terminal is characterized in that a part of the tail end of a solid layer, which is not coated with insulating paint, is inserted into a copper sleeve, so that the copper sleeve extrudes part of the insulating paint layer to form an extrusion layer obliquely wrapping the solid layer, and the copper sleeve and the solid layer form close contact to form a complete connecting terminal for the inductor. According to the technical scheme, the copper sleeve is wrapped at the end part of the pure aluminum wire and metallurgical bonding is formed, so that the problems of electrochemical corrosion and poor weldability of the pure aluminum wire caused by the exposure of an aluminum core at the section of the pin of the copper-clad aluminum wire and the exposure of a base material of the copper-aluminum composite conductive terminal at present are solved. When necessary, at least one circle of reinforcing indentation is processed by using a special tool at the periphery of the wrapping layer, and when necessary, sealant and rust-proof oil are coated at the joint of the raised steps to prevent the corrosion of the external environment to the copper-aluminum contact interface. In addition, the copper-clad aluminum structure for the inductor connecting terminal has the following additional technical characteristics: According to one embodiment of the utility model, the wrapping layer is a sleeve made of copper, the wrapping layer is wrapped around the whole circumference from the tail end of the solid layer, and part of the insulating paint layer is sleeved and extruded to form an extrusion layer, and the covering area of the wrapping layer comprises the tail end of the solid layer and the extrusion layer. In the technical scheme, the free end of the copper sleeve extends to the surface of the insulating paint layer in an overfull circumferential wrapping mode, and the section edge of the insulating paint layer is completely covered. The sleeve made of copper and the aluminum core form full circumferential metallurgical bonding. According to one embodiment of the utility model, the solid layer is an aluminum wire with a round or flat section, the tail end of the solid layer is exposed outside in a certain length, and the surface of the rest part is provided with an insulating paint layer. In the technical scheme, the cross section is round, the diameter of a round aluminum wire is 4.0mm, the thickness of an insulating paint layer is 50 mu m, the expose