Conductive terminal and magnetic device

Abstract

The invention discloses a conductive terminal and a magnetic device. The conductive terminal comprises a supporting part and a welding part which are connected with each other. The supporting part is used for connecting a seat body of the component; the welding part is used for being welded with a conductive lead of the component, and the welding part comprises a bearing plate connected with the supporting part and a wrapping sheet bent upwards from the edge of the bearing plate; the bearing plate is provided with a first hollow area, and / or the coating sheet is provided with a second hollow area; when the conductive lead is arranged on the bearing plate, the wrapping sheet is bent towards the folding direction of the bearing plate to wrap the conductive lead for welding. When the conductive terminal is welded, heat can be prevented from being quickly conducted to the main body part of the coil through the first hollow area and the second hollow area, so that the problem of short circuit caused by melting of the insulating layer of the coil can be avoided, and the stability of the performance of the coil can be ensured.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic devices, and in particular to a conductive terminal and a magnetic device. Background Art

[0002] The coils of magnetic devices such as transformers and inductors are generally wound with enameled wires, and the two ends of the coils are welded to two metal terminals to achieve electrical connection. Current passing through the coil can generate a magnetic field to achieve the energy storage / filtering function of the product.

[0003] At present, soldering is mainly used for the connection between coils and metal terminals. The solder welding area is large, and the high temperature of welding will cause burnback damage to the insulation layer of the enameled wire. When the burnback reaches the coil, it will cause the coil lead and the coil body to short-circuit, resulting in a reduction in the actual effective number of winding turns, and thus leading to a decline in product performance. Summary of the invention

[0004] In view of the above technical problems, the present application provides a conductive terminal and a magnetic device, which can improve the problem that the insulating layer is easily melted and causes a short circuit when the existing conductive terminal and the conductive lead are welded.

[0005] In order to solve the above technical problems, in a first aspect, an embodiment of the present application provides a conductive terminal, including:

[0006] A conductive terminal, characterized by comprising a supporting portion and a welding portion connected to each other;

[0007] A support part, used for connecting a seat of components;

[0008] A welding portion, used for welding with the conductive lead of the component, the welding portion comprising: a bearing plate connected to the supporting portion, and a covering sheet bent upward from the edge of the bearing plate;

[0009] The carrier plate is provided with a first hollow area, and / or the covering sheet is provided with a second hollow area;

[0010] When the conductive lead is placed on the carrier plate, the covering sheet is bent in a direction to close to the carrier plate to cover the conductive lead for welding.

[0011] Optionally, the second hollow area is a cutout extending to the edge of the covering sheet;

[0012] When the covering sheet is unfolded to be located in the same plane as the carrying plate, the first hollow area and the second hollow area are located in the same straight line.

[0013] Optionally, one second hollow area is provided, and two first hollow areas are provided, and when the covering sheet is unfolded to be located in the same plane as the supporting plate, the two first hollow areas are respectively located on both sides of the straight line where the second hollow area is located.

[0014] Optionally, the first hollow area is elliptical, and the width of the first hollow area and the width of the second hollow area are greater than or equal to 0.03 mm.

[0015] Optionally, the first hollow area and the second hollow area are circular holes, and a plurality of each are provided.

[0016] Optionally, the support portion is used for integral injection molding with the seat body;

[0017] The support portion comprises:

[0018] A first fixing plate connected to the welding portion and located in the same plane as the welding portion;

[0019] The second fixing plate includes a first side wall bent downwardly from one side of the first fixing plate, a bottom wall bent from the lower edge of the first side wall toward a direction away from the first fixing plate, and a second side wall bent upwardly from one side of the bottom wall.

[0020] Optionally, the first fixing plate is U-shaped;

[0021] The first side wall is bent downward from the inner side of the U shape.

[0022] Optionally, a dimension L of the first hollow area and / or the second hollow area along the circumference of the conductive lead satisfies: L≥0.15πD, wherein D is the outer diameter of the conductive lead.

[0023] Optionally, the coverage rate of the coating sheet on the surface of the conductive lead is greater than or equal to 60%.

[0024] In a second aspect, an embodiment of the present application provides a magnetic device, including a seat, a magnetic core, a coil, a sealing body, and two conductive terminals as described in the above embodiments;

[0025] The two conductive terminals and the magnetic core are arranged on the base;

[0026] The coil is sleeved on the outside of the magnetic core;

[0027] The sealing body is arranged on the outer side of the coil to seal the coil, and two conductive leads of the coil pass through the sealing body and are respectively welded to the two conductive terminals.

[0028] As described above, the conductive terminal of the present application includes a supporting portion and a welding portion connected to each other, and the welding portion includes: a carrier plate and a covering sheet bent upward from the edge of the carrier plate. When the conductive lead is welded to the conductive terminal, it is placed on the carrier plate, and then the covering sheet is bent in the direction of closing with the carrier plate to cover the conductive lead, and then the welding operation is performed, which can be solder welding, preferably laser welding with a smaller welding area. The covering sheet deforms at high temperature and is tightly connected to the conductive lead. During welding, the first hollow area and the second hollow area can block the heat from being quickly conducted to the main body of the coil, thereby avoiding the problem of short circuit caused by melting (i.e., burning back) of the insulation layer of the coil, and ensuring the stability of the performance of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0030] Figure 1 This is a welding effect diagram of a coil and a metal terminal of a magnetic device in the related technology;

[0031] Figure 2 is a schematic diagram of the structure of a conductive terminal provided in an embodiment of the present application, wherein (a) and (b) are from different viewing angles;

[0032] Figure 3 This is a diagram of a use state of a conductive terminal provided in an embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of a conductive terminal and a conductive lead after welding provided by an embodiment of the present application;

[0034] Figure 5 is a schematic structural diagram of another conductive terminal provided in an embodiment of the present application;

[0035] Figure 6 is a diagram of another use state of a conductive terminal provided in an embodiment of the present application;

[0036] Figure 7 is a schematic structural diagram of a magnetic device provided in an embodiment of the present application;

[0037] Figure 8 is along Figure 7 Schematic diagram of the cross-sectional structure along the AA line;

[0038] Fig. 9 yes Figure 7 Exploded diagram of

[0039] Fig.10 This is a welding effect diagram of a coil and a conductive terminal of a magnetic device provided in an embodiment of the present application.

[0040] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The above-mentioned drawings have shown clear embodiments of this application, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0042] It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this document, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless otherwise indicated in the context.

[0043] It should be understood that the orientations or positional relationships indicated by terms such as "top", "bottom", "up", "down", "vertical", and "horizontal" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] As mentioned above, the current welding method between the coil and the metal terminal will cause the insulation layer of the enameled wire to burn back and damage, which will lead to a decrease in product performance. Please refer to Figure 1 , Figure 1This is a partial enlarged view of the welding of a coil and a metal terminal of a magnetic device of the related technology. It can be seen that the insulating layer of the coil near the welding end is melted by high temperature, which will cause a short circuit in the coil and affect the effective number of turns of the coil. As an improvement, a laser welding process with a smaller welding area can be used. However, although the laser welding area is small, the temperature is high, and the high temperature can also be transmitted through the lead of the coil to the insulating layer of the enameled wire, causing a certain degree of burnback. Based on this, the present application provides a conductive terminal and a magnetic device.

[0045] See also Figure 2 , Figure 2 1 is a schematic diagram of a conductive terminal provided in an embodiment of the present application, wherein (a) and (b) are different perspectives, and the conductive terminal includes a supporting portion 10 and a welding portion 20 connected to each other. Exemplarily, the conductive terminal may be an integrated molding structure, and the material may be copper.

[0046] The support portion 10 is used to connect the seat of the component. For example, if the component is an inductor, the support portion 10 can be integrally formed with the seat of the inductor. The welding portion 20 is used to weld with the conductive lead 410 of the inductor coil. For example, the conductive lead 410 can be the electrical connection end of the coil 400. Figure 3 , Figure 3 This is a diagram of the use status of a conductive terminal provided in an embodiment of the present application. The welding portion 20 may include: a carrier plate 21 and a covering sheet 22. The carrier plate 21 is connected to the support portion 10. The covering sheet 22 is bent upward from the edge of the carrier plate 21. The covering sheet 22 may be provided at the edge of the carrier plate 21, or one covering sheet 22 may be provided at each of the two opposite sides of the carrier plate 21. A first hollow area 211 is provided on the carrier plate 21, and a second hollow area 221 is provided on the covering sheet 22. It should be noted that only one of the first hollow area 211 and the second hollow area 221 may be provided, or both may be provided at the same time. When the conductive lead 410 is placed on the carrier plate 21, the covering sheet 22 is bent in a direction to close with the carrier plate 21, and covers the conductive lead 410 for welding. Please refer to Figure 4 , Figure 4 This is a schematic diagram of a conductive terminal and a conductive lead after welding provided in an embodiment of the present application.

[0047] As described above, the conductive terminal of this embodiment includes a supporting portion 10 and a welding portion 20 that are connected to each other, and the welding portion 20 includes: a supporting plate 21 and a covering sheet 22 that is bent upward from the edge of the supporting plate 21. When the conductive lead 410 is welded to the conductive terminal, it is placed on the supporting plate 21, and then the covering sheet 22 is bent in a direction to close with the supporting plate 21 to cover the conductive lead 410, and then the welding operation is performed, which can be solder welding, and laser welding with a smaller welding area is preferred. The covering sheet 22 deforms at high temperature and is tightly connected to the conductive lead 410. Since the heat conductivity of air is much weaker than that of the covering sheet 22 and the carrier plate 21 (generally made of copper), the speed of heat conduction to the main body of the coil can be greatly reduced through the first hollow area 211 and the second hollow area 221 during welding. At the same time, the heat can be radiated and convectively dissipated through the first hollow area 211 and the second hollow area 221, which can further reduce the heat conduction to the main body of the coil, thereby avoiding the problem of short circuit caused by melting (i.e., burning back) of the insulation layer of the coil, and ensuring the stability of the performance of the coil.

[0048] It can be understood that the conductive terminal of this embodiment can be applied not only to inductors, but also to other structures that require welding of conductive leads, such as transformers.

[0049] In one embodiment, please refer to Figure 2 The second hollow area 221 is a cutout extending to the edge of the covering sheet 22. The entire welding portion 20 is provided with a second hollow area 221 and a first hollow area 211 at the same time. When the covering sheet 22 is unfolded to be in the same plane as the carrier plate 21, the first hollow area 211 and the second hollow area 221 are located on the same straight line, that is, the first hollow area 211 and the second hollow area 221 are located on the same circumference on the conductive lead. After welding, the heat can be blocked by an almost complete circle, reducing the speed at which the heat is conducted to the main part of the coil.

[0050] It should be noted that the first hollow area 211 may be a circular hole, and a plurality of circular holes may be provided. The embodiment of the present application does not specifically limit the shape and number of the first hollow area 211. Preferably, the size L of the first hollow area 211 and / or the second hollow area 221 along the circumference of the conductive lead 410 satisfies: L ≥ 0.15πD, where D is the outer diameter of the conductive lead 410. That is, along the circumference of the conductive lead 410, the total length of the first hollow area 211 and the second hollow area 221 is greater than or equal to 15% of the circumference of the conductive lead 410 to ensure sufficient heat conduction blocking capability.

[0051] Preferably, in one embodiment, see Figure 5 , Figure 5It is a structural schematic diagram of another conductive terminal provided in an embodiment of the present application, wherein one second hollow area 221 is provided on the covering sheet 22, and two first hollow areas 211 are provided on the supporting plate 21, and when the covering sheet 22 is unfolded to be in the same plane as the supporting plate 21, the two first hollow areas 211 are respectively located on both sides of the straight line where the second hollow area 221 is located, that is, the second hollow area 221 is staggered with the two first hollow areas 211, which can ensure the overall strength of the covering sheet 22 and facilitate processing. At the same time, since there are two first hollow areas 211, sufficient heat conduction blocking capability can be ensured.

[0052] For further details, please refer to Figure 6 , Figure 6 2 is a diagram of another conductive terminal in use provided by an embodiment of the present application. The first hollow area 211 and the second hollow area 221 of the conductive terminal are both circular holes, and a plurality of circular holes are provided respectively. Preferably, the circular holes are evenly distributed on the carrier plate 21 and the covering sheet 22. By providing the first hollow area 211 and the second hollow area 221 as a structural form of a plurality of circular holes, the structural reliability can be improved while ensuring that heat conduction is blocked.

[0053] As an example, see Figure 2 and Figure 5 , the first hollow area 211 on the carrier plate 21 is elliptical, and the width of the first hollow area 211 and the width of the second hollow area 221 are greater than or equal to 0.03 mm. For example, the width can be 0.03 mm, 0.05 mm, 0.1 mm, 0.3 mm, 0.5 mm, etc. Preferably, the sum of the areas of the first hollow area 211 and the second hollow area 221 is less than or equal to 40% of the area of ​​the entire covering sheet 22, that is, the coverage rate of the covering sheet 22 on the surface of the conductive lead 410 is greater than or equal to 60%, so as to ensure the contact area between the two and ensure good electrical connection between the two.

[0054] In one embodiment, please refer to Figure 2 , Figure 7 and Figure 8 , Figure 7 is a schematic diagram of the structure of a magnetic device provided in an embodiment of the present application, Figure 8 is along Figure 7In the schematic cross-sectional structure diagram along the AA line, the support portion 10 of the conductive terminal is used for integrated injection molding with the seat body 200 of the component. The support portion 10 may include: a first fixing plate 11 and a second fixing plate 12. The first fixing plate 11 is connected to the welding portion 20 and is located in the same plane as the welding portion 20. The second fixing plate 12 includes a first side wall 121 bent downwardly and extended from one side of the first fixing plate 11, a bottom wall 122 bent from the lower edge of the first side wall 121 in a direction away from the first fixing plate 11, and a second side wall 123 bent upwardly and extended from one side of the bottom wall 122. Specifically, the first side wall 121 and the second side wall 123 are arranged opposite to each other.

[0055] In this embodiment, the first side wall 121, the bottom wall 122 and the second side wall 123 of the second fixed plate 12 form a groove, which is integrated with the base 200 of the component to form a concave-convex matching structure, thereby forming a more stable structure, improving the reliability of the component structure, and preventing the conductive terminal from falling off the base 200.

[0056] Exemplarily, the first fixing plate 11 is U-shaped, see Figure 2 and Figure 5 The first side wall 121 is bent downward from the inner side of the U shape. That is, the U-shaped first fixing plate 11 surrounds the outer side of the first side wall 121 .

[0057] The present application also provides a magnetic device. Figure 7-Figure 9 , Fig. 9 yes Figure 7 The exploded view shows that the magnetic device includes a base 200, a magnetic core 300, a coil 400, a sealing body 500, and the conductive terminals 100 described in the above embodiments; two conductive terminals 100 and the magnetic core 300 are arranged on the base 200; the coil 400 is sleeved on the outside of the magnetic core 300; the sealing body 500 is arranged on the outside of the coil 400 to seal the coil 400, and the two conductive leads 410 of the coil 400 pass through the sealing body 500 and are respectively welded to the two conductive terminals 100.

[0058] As an example of manufacturing the magnetic device, the conductive terminal 100 and the base 200 can be integrated by injection molding, and the magnetic core 300 and the base 200 can be assembled, and then the coil 400 can be wound on the magnetic core 300, and then the conductive lead 410 of the coil 400 and the conductive terminal 100 can be welded, and finally the coil 400 can be sealed by insulating glue, and the insulating glue can form the above-mentioned sealing body 500. Please refer to Fig.10 , Fig.10 This is a welding effect diagram of a coil and a conductive terminal of a magnetic device provided in an embodiment of the present application. Figure 1In the magnetic device made of the conductive terminal of the present application, the welding between the coil 400 and the conductive terminal 100 is very smooth, which solves the welding backburning problem well.

[0059] The above is a detailed introduction to a conductive terminal and a magnetic device provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. It should be noted that in the present application, the descriptions of various embodiments have different emphases. For parts that are not described or recorded in detail in a particular embodiment, please refer to the relevant descriptions of other embodiments.

[0060] The above are only preferred embodiments of the present application, and the patent scope of the present application is not limited thereto. The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of this application, or directly or indirectly used in other related technical fields, as long as there is no contradiction in the combination of these technical features, are equally included in the patent protection scope of the present application.

Claims

1. A conductive terminal, characterized in that: including a supporting portion and a welding portion connected to each other; A support part, used for connecting a seat of components; A welding portion, used for welding with the conductive lead of the component, the welding portion comprising: a bearing plate connected to the supporting portion, and a covering sheet bent upward from the edge of the bearing plate; The carrier plate is provided with a first hollow area, and / or the covering sheet is provided with a second hollow area; When the conductive lead is placed on the carrier plate, the covering sheet is bent in a direction to close to the carrier plate to cover the conductive lead for welding.

2. The conductive terminal according to claim 1, characterized in that: The second hollow area is a cutout extending to the edge of the covering sheet; When the covering sheet is unfolded to be located in the same plane as the carrying plate, the first hollow area and the second hollow area are located in the same straight line.

3. The conductive terminal according to claim 1, characterized in that: There is one second hollow area, and there are two first hollow areas. When the covering sheet is unfolded to be in the same plane as the supporting plate, the two first hollow areas are respectively located on both sides of the straight line where the second hollow area is located.

4. The conductive terminal according to claim 2 or 3, characterized in that: The first hollow area is elliptical, and the width of the first hollow area and the width of the second hollow area are greater than or equal to 0.03 mm.

5. The conductive terminal according to claim 1, characterized in that: The first hollow area and the second hollow area are circular holes, and a plurality of the first hollow area and the second hollow area are respectively provided.

6. The conductive terminal according to claim 1, characterized in that: The support portion is used for integral injection molding with the seat body; The support portion comprises: A first fixing plate connected to the welding portion and located in the same plane as the welding portion; The second fixing plate includes a first side wall bent downwardly from one side of the first fixing plate, a bottom wall bent from the lower edge of the first side wall toward a direction away from the first fixing plate, and a second side wall bent upwardly from one side of the bottom wall.

7. The conductive terminal according to claim 6, characterized in that: The first fixing plate is U-shaped; The first side wall is bent downward from the inner side of the U shape.

8. The conductive terminal according to claim 1, characterized in that: A size L of the first hollow area and / or the second hollow area along the circumference of the conductive lead satisfies: L≥0.15πD, wherein D is the outer diameter of the conductive lead.

9. The conductive terminal according to claim 8, characterized in that: The coverage rate of the coating sheet on the surface of the conductive lead is greater than or equal to 60%.

10. A magnetic device, characterized in that: It comprises a seat, a magnetic core, a coil, a sealing body, and two conductive terminals according to any one of claims 1 to 9; The two conductive terminals and the magnetic core are arranged on the base; The coil is sleeved on the outside of the magnetic core; The sealing body is arranged on the outer side of the coil to seal the coil, and two conductive leads of the coil pass through the sealing body and are respectively welded to the two conductive terminals.

Images