Conductive terminal and magnetic device
By designing conductive terminals with hollowed-out areas and using laser welding technology, the problem of insulation layer burn-back during coil-metal terminal welding was solved, ensuring coil performance stability and welding reliability.
Patent Information
- Application Number
- CN202423049573.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In the prior art, the soldering between the coil and the metal terminal causes the insulation layer of the enameled wire to burn back and be damaged, resulting in a short circuit in the coil and affecting product performance.
The design employs conductive terminals, including a support section and a welding section. The welding section has a hollow area, which is laser-welded and tightly connected to the conductive leads by the deformation of the cladding sheet at high temperature, reducing heat conduction to the coil body and preventing the insulation layer from melting.
This effectively avoids the problem of coil insulation burning back, ensures coil performance stability, and improves welding reliability and the effective number of winding turns of the product.
Smart Images
Figure CN223729050U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of magnetic devices, in particular to a conductive terminal and a magnetic device. BACKGROUND
[0002] The coils of magnetic devices such as transformers and inductive elements are generally wound with enameled wires, and the two ends of the coil are respectively welded with two metal terminals to realize electrical connection. The current passing through the coil can generate a magnetic field to realize the energy storage / filtering function of the product.
[0003] At present, the connection between the coil and the metal terminal mainly adopts soldering, and the soldering area is large. The high temperature of welding can cause damage to the insulating layer of the enameled wire. When the back-burning reaches the coil, it will cause the lead wire of the coil to short circuit with the coil body, resulting in a decrease in the actual effective winding number, and further causing the performance of the product to decrease. CONTENT OF THE UTILITY MODEL
[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 existing conductive terminal is easy to cause short circuit due to melting of the insulating layer when welded with the conductive lead wire.
[0005] To solve the above technical problems, in a first aspect, the present application provides a conductive terminal, comprising:
[0006] A conductive terminal, characterized by comprising a support part and a welding part connected to each other;
[0007] The support part is used for connecting the seat body of the component;
[0008] The welding part is used for welding with the conductive lead wire of the component, and the welding part comprises a bearing plate connected to the support part and a cladding sheet bent upward from the edge of the bearing plate;
[0009] The bearing plate is provided with a first hollow area, and / or the cladding sheet is provided with a second hollow area;
[0010] When the conductive lead wire is placed on the bearing plate, the cladding sheet is bent in the direction of folding with the bearing plate to cover the conductive lead wire for welding.
[0011] Optionally, the second hollow area is a cutout extending to the edge of the cladding sheet;
[0012] When the cladding sheet is unfolded to be in the same plane as the bearing plate, the first hollow area and the second hollow area are located on the same straight line.
[0013] Optionally, the second hollowed area is provided with one, the first hollowed area is provided with two, and when the cladding sheet is unfolded to be in the same plane as the bearing plate, the two first hollowed areas are respectively located on both sides of the straight line on which the second hollowed area is located.
[0014] Optionally, the first hollowed area is elliptical, and the width of the first hollowed area and the width of the second hollowed area are greater than or equal to 0.03 mm.
[0015] Optionally, the first hollowed area and the second hollowed area are circular holes, and a plurality of each are provided.
[0016] Optionally, the support part is used for integrated injection molding with the seat body.
[0017] The support part comprises:
[0018] The first fixed plate is connected with the welding part and is in the same plane as the welding part.
[0019] The second fixed plate comprises a first side wall extending downward from one side of the first fixed plate, a bottom wall extending downward from the lower edge of the first side wall away from the first fixed plate, and a second side wall extending upward from one side of the bottom wall.
[0020] Optionally, the first fixed plate is U-shaped.
[0021] The first side wall is bent downward from the inside of the U-shaped.
[0022] Optionally, the size L of the first hollowed area and / or the second hollowed area along the circumference of the conductive lead wire satisfies: L≥0.15πD, wherein D is the outer diameter of the conductive lead wire.
[0023] Optionally, the coverage of the cladding sheet on the surface of the conductive lead wire is greater than or equal to 60%.
[0024] In a second aspect, the embodiments of the present application provide a magnetic device, comprising a seat body, 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 seat body.
[0026] The coil is sleeved outside the magnetic core.
[0027] The sealing body is arranged outside the coil to seal the coil, and two conductive lead wires of the coil pass out of the sealing body and are respectively welded with the two conductive terminals.
[0028] As described above, the conductive terminal of the present application comprises a support part and a welding part connected to each other, and the welding part comprises a bearing plate and a cladding sheet bent upward from the edge of the bearing plate. When the conductive lead is welded to the conductive terminal, it is placed on the bearing plate, and then the cladding sheet is bent toward the direction of folding with the bearing plate to clad the conductive lead, and then the welding operation is performed, which can be soldering, and preferably laser welding with a smaller welding area. The cladding sheet deforms at high temperature and is tightly connected with the conductive lead. During welding, heat can be blocked from quickly conducting to the main part of the coil through the first and second hollowed areas, so that the problem of short circuit caused by melting (i.e. back burning) of the insulating layer of the coil can be avoided, and the stability of the performance of the coil can be ensured. BRIEF DESCRIPTION OF DRAWINGS
[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve 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 needed to be used in the description of the embodiments will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.
[0030] Figure 1 is a structural schematic diagram of a conductive terminal provided by an embodiment of the present application, wherein (a) and (b) are different viewing angles, respectively;
[0031] Figure 2 is a use state diagram of a conductive terminal provided by an embodiment of the present application;
[0032] Figure 3 is a schematic diagram of a conductive terminal after being welded to a conductive lead provided by an embodiment of the present application;
[0033] Figure 4 is a structural schematic diagram of another conductive terminal provided by an embodiment of the present application;
[0034] Figure 5 is a use state diagram of another conductive terminal provided by an embodiment of the present application;
[0035] Figure 6 is a structural schematic diagram of a magnetic device provided by an embodiment of the present application;
[0036] Figure 7 is a cross-sectional structural schematic diagram along line A-A of Figure 6 ;
[0037] Figure 8 is an exploded view of Figure 6 ;
[0038] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments in conjunction with the accompanying drawings. The above-described drawings have shown the specific embodiments of the present application, and will be described in more detail hereinafter. These drawings and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0039] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments are not meant to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.
[0040] It should be understood that although the terms first, second, third, etc. can be used herein to describe various information, the information should not be limited to these terms. These terms are only used to distinguish one piece of information from another piece of information. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information, without departing from the scope of the present disclosure. Depending on the context, the singular forms "a", "an" and "the" used herein are intended to include the plural forms as well, unless the context clearly indicates otherwise.
[0041] It should be understood that the terms "top", "bottom", "upper", "lower", "vertical", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0042] As described above, the current welding method between the coil and the metal terminal can cause the insulating layer of the enameled wire to be damaged by back burning, which in turn causes the performance of the product to decrease. The insulating layer near the welded end of the coil is melted by high temperature, which can cause short circuit of 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 has a smaller area, the temperature is relatively high, and the high temperature can also be conducted to the insulating layer of the enameled wire through the lead of the coil, causing a certain degree of back burning. Based on this, the present application provides a conductive terminal and a magnetic device.
[0043] Please refer to Figure 1 , Figure 1is a structural schematic diagram of a conductive terminal provided by an embodiment of the present application, wherein (a) and (b) are different perspectives, respectively. The conductive terminal comprises a support part 10 and a welding part 20 connected to each other. Exemplarily, the conductive terminal can be an integrally formed structure, and the material can be copper.
[0044] The support part 10 is used to connect the seat body of a component, and the component is taken as an inductor as an example. For example, the support part 10 can be integrally formed with the seat body of the inductor. The welding part 20 is used to be welded with a conductive lead 410 of the inductor coil. Exemplarily, the conductive lead 410 can be an electrical connection end of the coil 400. Please refer to Figure 2 Figure 2 is a use state diagram of a conductive terminal provided by an embodiment of the present application. The welding part 20 can comprise a bearing plate 21 and a cladding sheet 22. The bearing plate 21 is connected to the support part 10, and the cladding sheet 22 is bent upward from the edge of the bearing plate 21. One cladding sheet 22 can be arranged at the edge of the bearing plate 21, or one cladding sheet 22 can be arranged at each of two opposite edges of the bearing plate 21. The bearing plate 21 is provided with a first hollow area 211, and the cladding sheet 22 is provided with a second hollow area 221. It should be noted that the first hollow area 211 and the second hollow area 221 can be arranged only one of them, or both of them can be arranged. When the conductive lead 410 is placed on the bearing plate 21, the cladding sheet 22 is bent in the direction of folding with the bearing plate 21 to cover the conductive lead 410 for welding. Please refer to Figure 3 Figure 3 is a schematic diagram of the conductive terminal after being welded with the conductive lead.
[0045] As described above, the conductive terminal of the embodiment comprises the support part 10 and the welding part 20 connected to each other, and the welding part 20 comprises the bearing plate 21 and the cladding sheet 22 bent upward from the edge of the bearing plate 21. When the conductive lead 410 is welded with the conductive terminal, the conductive lead 410 is placed on the bearing plate 21, and then the cladding sheet 22 is bent in the direction of folding with the bearing plate 21 to cover the conductive lead 410, and then welding operation is performed, which can be soldering, and preferably laser welding with a smaller welding area. The cladding sheet 22 is deformed at high temperature to be tightly connected with the conductive lead 410. Since the heat conduction capacity of air is far weaker than that of the cladding sheet 22 and the bearing plate 21 (generally made of copper), the speed of heat conduction to the main body part 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, heat can be radiated and convected through the first hollow area 211 and the second hollow area 221 to dissipate heat, which can further reduce the heat conduction to the main body part of the coil, so that the problem of short circuit caused by melting (i.e. back burning) of the insulating layer of the coil can be avoided, and the stability of the performance of the coil can be ensured.
[0046] It can be understood that the conductive terminal of the embodiment can be applied not only to the inductor, but also to other structures requiring welding of conductive leads, such as transformers and the like.
[0047] In one embodiment, please refer to Figure 1 , the second hollow area 221 is a cutout extending to the edge of the cladding sheet 22, one second hollow area 221 and one first hollow area 211 are provided in the entire welding portion 20, and when the cladding 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 almost completely blocked in a complete circle, reducing the speed of heat conduction to the main part of the coil.
[0048] It should be noted that the first hollow area 211 can be a circular hole, and a plurality of circular holes can be provided, and the shape and number of the first hollow area 211 are not particularly limited in the embodiment of the application. 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, wherein 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, so as to ensure sufficient heat conduction blocking capability.
[0049] Preferably, in one embodiment, please refer to Figure 4 , Figure 4 is a structural schematic diagram of another conductive terminal provided by the embodiment of the application, one second hollow area 221 is provided on the cladding sheet 22, two first hollow areas 211 are provided on the carrier plate 21, and when the cladding sheet 22 is unfolded to be in the same plane as the carrier plate 21, the two first hollow areas 211 are respectively located on the two sides of the straight line on which the second hollow area 221 is located, that is, the second hollow area 221 and the two first hollow areas 211 are staggered, which can ensure the overall strength of the cladding sheet 22 and facilitate processing, and at the same time, since the first hollow area 211 is provided with two, sufficient heat conduction blocking capability can be ensured.
[0050] Further preferably, please refer to Figure 5 , Figure 5 is a use state diagram of another conductive terminal provided by the embodiment of the 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. Preferably, the above-mentioned circular holes are uniformly distributed on the carrier plate 21 and the cladding sheet 22. By providing the first hollow area 211 and the second hollow area 221 in the form of a plurality of circular holes, the structural reliability can be improved while ensuring the blocking of heat conduction.
[0051] As an example, please continue reading Figure 1 and Figure 4 The first cutout area 211 on the carrier plate 21 is elliptical, and the width of the first cutout area 211 and the width of the second cutout 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 cutout area 211 and the second cutout area 221 is less than or equal to 40% of the total area of the 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%, to ensure the contact area between the two and to ensure good electrical connection between them.
[0052] In one embodiment, please refer to... Figure 1 , Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of a magnetic device provided in an embodiment of this application. Figure 7 It is along Figure 6 A cross-sectional view of the AA wire shows that the support portion 10 of the conductive terminal is used for integrated injection molding with the component's base 200. 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 on the same plane as the welding portion 20. The second fixing plate 12 includes a first sidewall 121 that extends downward from one side of the first fixing plate 11, a bottom wall 122 that extends away from the lower edge of the first sidewall 121, and a second sidewall 123 that extends upward from one side of the bottom wall 122. Specifically, the first sidewall 121 and the second sidewall 123 are arranged opposite to each other.
[0053] In this embodiment, the first sidewall 121, bottom wall 122 and second sidewall 123 of the second fixing plate 12 form a groove, which is integrally formed with the component base 200 to form a concave-convex fit structure, thereby forming a more stable structure, improving the reliability of the component structure and preventing the conductive terminals from falling off the base 200.
[0054] For example, the first fixing plate 11 is U-shaped, see [link / reference]. Figure 1 and Figure 4 The first sidewall 121 bends downward from the inside of the U-shape. That is, the first fixing plate 11 of the U-shape surrounds the outside of the first sidewall 121.
[0055] This application also provides a magnetic device; please refer to [link / reference]. Figures 6-8 , Figure 8 yes Figure 6The exploded view of the magnetic device includes a seat body 200, a magnetic core 300, a coil 400, a sealing body 500, and the conductive terminal 100 as described in the above embodiments; the two conductive terminals 100 and the magnetic core 300 are arranged on the seat body 200; the coil 400 is sleeved outside the magnetic core 300; the sealing body 500 is arranged outside the coil 400 to seal the coil 400, and two conductive leads 410 of the coil 400 pass through the sealing body 500 and are welded with the two conductive terminals 100 respectively.
[0056] As an example of manufacturing the magnetic device, the conductive terminal 100 and the seat body 200 can be integrally injection molded, the magnetic core 300 is assembled with the seat body 200, then the coil 400 is wound on the magnetic core 300, the conductive leads 410 of the coil 400 are welded with the conductive terminal 100, finally the coil 400 is sealed by the insulating glue, and the insulating glue forms the sealing body 500. Compared with the prior art, the welding between the coil 400 and the conductive terminal 100 of the magnetic device manufactured by the conductive terminal of the present application is smooth, and the problem of welding back burning is well solved.
[0057] The conductive terminal and the magnetic device provided by the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. It should be noted that the description of each embodiment in the present application has its own emphasis, and the parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.
[0058] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and each technical feature of the technical solution of the present application can be combined arbitrarily. In order to make the description simple, each technical feature in the above embodiments is not described all possible combinations, and any equivalent structure or equivalent flow conversion made by using the content of the present application and the drawings, or directly or indirectly applied in other related technical fields, as long as the combination of these technical features does not exist contradiction, are also included in the patent protection scope of the present application.
Claims
1. An electrically conductive terminal, characterized by, The support part and the welding part are connected to each other; The support part is used for connecting a seat of a component; The welding part is used for welding with a conductive lead of the component, and the welding part comprises a bearing plate connected with the support part and a cladding sheet bent upward from an edge of the bearing plate; The bearing plate is provided with a first hollowed-out area, and / or the cladding sheet is provided with a second hollowed-out area; When the conductive lead is placed on the bearing plate, the cladding sheet is bent towards the bearing plate to cover the conductive lead for welding.
2. The electrically conductive terminal of claim 1, wherein The second hollowed-out area is a cutout extending to the edge of the cladding sheet; When the cladding sheet is unfolded to be in the same plane as the bearing plate, the first hollowed-out area and the second hollowed-out area are located on the same straight line.
3. The electrically conductive terminal of claim 1, wherein The second hollowed-out area is provided with one, and the first hollowed-out area is provided with two, and when the cladding sheet is unfolded to be in the same plane as the bearing plate, the two first hollowed-out areas are respectively located on both sides of the straight line where the second hollowed-out area is located.
4. An electrically conductive terminal according to claim 2 or 3, characterized in that The first hollowed-out area is elliptical, and the width of the first hollowed-out area and the width of the second hollowed-out area are greater than or equal to 0.03mm.
5. The electrically conductive terminal of claim 1, wherein The first hollowed-out area and the second hollowed-out area are circular holes, and a plurality of each are provided.
6. The electrically conductive terminal of claim 1, wherein The support part is used for integrally injection molding with the seat; The support part comprises: The first fixed plate is connected with the welding part and is in the same plane as the welding part; The second fixed plate comprises a first side wall bent downward from one side of the first fixed plate, a bottom wall bent downward from a lower edge of the first side wall away from the first fixed plate, and a second side wall bent upward from one side of the bottom wall.
7. The electrically conductive terminal of claim 6, wherein The first fixed plate is U-shaped; The first side wall is bent downward from the inner side of the U-shaped.
8. The electrically conductive terminal of claim 1, wherein The size L of the first hollowed-out area and / or the second hollowed-out area along the circumference of the conductive lead satisfies: L≥0.15πD, wherein D is the outer diameter of the conductive lead.
9. The electrically conductive terminal of claim 8, wherein, The coverage of the cladding sheet on the surface of the conductive lead is greater than or equal to 60%.
10. A magnetic device, characterized by, The seat, the magnetic core, the coil, the sealing body, and two conductive terminals according to any one of claims 1-9 are comprised; The two conductive terminals and the magnetic core are arranged on the seat; The coil is sleeved outside the magnetic core; The sealing body is arranged outside the coil to seal the coil, and two conductive leads of the coil pass through the sealing body and are respectively welded with the two conductive terminals.