Sheet-type terminal easy to hang wires and magnetic device

Abstract

The utility model provides an easy-to-hang wire sheet type terminal and a magnetic device. The sheet type terminal easy to hang the wire comprises a side electrode and a patch electrode which are vertically connected, the side electrode comprises a main body part and a welding part, the main body part is vertically connected with the patch electrode, the welding part is connected to one end, far away from the patch electrode, of the main body part, and the end part of the welding part is provided with a concave area. Acute angles are formed between the extending direction of the concave area and the length direction of the welding part and between the extending direction of the concave area and the width direction of the welding part. Therefore, when the terminal is applied to the magnetic device, a lead of a winding can extend into the sunken area after passing through the wire passing groove of the magnet and is welded with the welding part, and the lead is restrained by the sunken area and is prevented from sliding out of the terminal area, so that poor wire hanging can be eliminated, and the service life of the terminal is prolonged. Therefore, the risks of lead breakage, poor welding and the like caused by poor wire hanging are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of magnetic devices, in particular to an easy hanging wire sheet terminal and a magnetic device. BACKGROUND

[0002] With the rapid development of technology, especially the emergence of multifunctional devices, the demand for passive devices is increasing, and as one of the passive components, magnetic devices are widely used, and the demand for large current, high frequency, high reliability and other requirements of magnetic devices is constantly upgraded. The magnetic device at least includes a magnet, a winding and an external terminal, the external terminal mainly undertakes two functions, one is as a welding part, welded with the lead of the winding, and the other is as a patch electrode, SMT (Surface Mounted Technology) mounted with circuit board (for example, PCB, Printed Circuit Board) and the like.

[0003] In the existing magnetic device based on side welding, the part of the external terminal on the side of the magnet is the side electrode, the welding part is arranged on the side electrode, and the lead of the winding extends from the magnet to the side of the magnet and is welded with the welding part of the side electrode. The end of the existing side electrode towards the lead is usually flat and smooth, which is easy to make the lead fall out of the terminal area, causing the so-called hanging wire failure, which is easy to cause the lead to slide and shake, thereby increasing the risk of lead breakage and poor welding. CONTENT OF THE UTILITY MODEL

[0004] In view of this, the present application provides an easy hanging wire sheet terminal and a magnetic device, which can improve the hanging wire failure of the external terminal and the high risk problems caused thereby, such as lead breakage, poor welding and the like.

[0005] The easy hanging wire sheet terminal provided by the present application comprises a side electrode and a patch electrode connected vertically, the side electrode comprises a main body part and a welding part, the main body part is connected with the patch electrode vertically, the welding part is connected to one end of the main body part away from the patch electrode, an end of the welding part is provided with a recessed area, and the extension direction of the recessed area forms an acute angle with the length direction of the welding part and the width direction of the welding part.

[0006] Optionally, the extension direction of the recessed area is towards the patch electrode.

[0007] Optionally, an inclined edge is arranged on the end of the welding part away from the main body part and the patch electrode, the inclined direction of the inclined edge intersects with the extension direction of the recessed area, and the inclined edge forms an X shape.

[0008] Optionally, the thickness of the recessed area gradually increases along the extension direction of the recessed area, and the thickness of the two sides of the recessed area is always greater than the thickness of the recessed area.

[0009] Optionally, the thickness of the welding portion gradually increases along the length direction of the welding portion, and is equal to the maximum thickness of the side electrode; the thickness of the two sides of the recessed mouth of the recessed area is equal to the maximum thickness of the side electrode.

[0010] Optionally, the thickness of the side electrode between the welding portion and the main body portion decreases to form a thinning area.

[0011] Optionally, the thickness of the thinning area is m0, the thickness of the main body portion is m1, and 0.3*m1≤m0≤0.6*m1 is satisfied.

[0012] Optionally, the thinning area is located on the side of the side electrode facing the patch electrode.

[0013] Optionally, the width of the side electrode between the welding portion and the main body portion decreases to form a contraction area.

[0014] The application provides a magnetic device, comprising a magnet, a winding, and the easy-to-hang patch terminal as any one of the above, the winding is arranged in the magnetic wall of the magnet, the magnetic wall is provided with a wire passing groove on the side facing the patch electrode, the lead wire of the winding extends into the recessed area of the easy-to-hang patch terminal through the wire passing groove, and is welded with the welding portion.

[0015] Optionally, the end edge of the welding portion is further provided with a straight edge, the straight edge extends along the width direction of the welding portion, one end point of the straight edge is connected with one end point of the beveled edge, and the other end point of the straight edge and the other end point of the beveled edge are respectively connected with two side edges of the welding portion arranged opposite in the width direction; the distance between the straight edge and the wire passing groove is D0, and 0.1mm≤D0≤0.3mm is satisfied.

[0016] As described above, in the easy-to-hang patch terminal and the magnetic device of the application, the external terminal includes a vertically connected side electrode and a patch electrode, the end of the welding portion of the side electrode is provided with a recessed area, the extension direction of the recessed area forms an acute angle with the length direction of the welding portion and the width direction of the welding portion, and when the terminal is applied to the magnetic device, the lead wire of the winding can extend into the recessed area through the wire passing groove of the magnet and be welded with the welding portion, the lead wire is constrained by the recessed area to avoid falling out of the terminal area, so that the poor hanging of the lead wire can be eliminated, and the risk of lead wire breakage, poor welding and the like caused by poor hanging of the lead wire can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structure perspective view of a magnetic device according to an embodiment of the present application from a first view angle;

[0018] Figure 2 is a structure perspective view of a magnetic device according to an embodiment of the present application from a second view angle;

[0019] Figure 3 is a side view of the magnetic device shown in Figure 1

[0020] Figure 4 is a front view of the magnetic device shown in Figure 1

[0021] Figure 5 is a side view of a wire-hanging terminal according to an embodiment of the present application;

[0022] Figure 6 is a structure perspective view of a magnetic device according to another embodiment of the present application from a first view angle;

[0023] Figure 7 is a structure perspective view of a magnetic device according to another embodiment of the present application from a second view angle.

[0024] a first direction x, a second direction y, a third direction;

[0025] a magnetic device 100;

[0026] a magnet 1, a magnetic cover plate 10, a magnetic core 11;

[0027] a wire passing groove 110, a magnetic column 111, a magnetic wall 112;

[0028] a first boss 113, a second boss 114, a convex strip 115;

[0029] a winding 2, a lead wire 20;

[0030] an external terminal 3, a first external terminal 3a, a second external terminal 3b;

[0031] a patch electrode 31, a side electrode 32, a first part 301, a second part 302;

[0032] a welding part 321, a main part 322, a recessed area 323;

[0033] a bevel 324, a straight edge 325, a thinning area 326, a shrinkage area 327. DETAILED DESCRIPTION

[0034] ​​To solve the above technical problems existing in the prior art, in the external terminal (also referred to as "external terminal") and the magnetic device of the present application, the external terminal comprises a side electrode and a patch electrode connected vertically, and the end of the welding part of the side electrode is provided with a recessed area, the extension direction of the recessed area forms an acute angle with the length direction of the welding part and the width direction of the welding part, and in the magnetic device, the lead of the winding can extend into the recessed area after passing through the wire slot of the magnet, and is welded with the welding part. The lead is constrained by the recessed area to avoid falling out of the terminal area, thereby eliminating the risk of poor wire hanging and the resulting lead breakage, poor welding and the like.

[0035] The specific forms of the shape, number, size and the like of any one of the external terminal, the side electrode, the patch electrode, the welding part, the recessed area, the wire slot, the winding and the magnet can be adapted according to the actual scene, and the present application is not limited thereto.

[0036] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in detail below in combination with specific embodiments and corresponding drawings. Obviously, the following described embodiments are only a part of the embodiments of the present application, not all the embodiments. In the case of no conflict, each of the following embodiments and its technical features can be combined with each other, and also belongs to the technical scheme of the present application.

[0037] In the description of the embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the technical scheme of the corresponding embodiment, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as a limitation of the present application.

[0038] Please refer to Figures 1 to 5 The magnetic device 100 of the present example comprises a magnet 1, a winding 2 and a plurality of external terminals 3. The external terminal 3 can also be referred to as a wire hanging sheet type terminal, and the number of external terminals 3 provided by the present application can be adapted according to the type of the magnetic device 100, for example, the magnetic device 100 shown in the figure can be provided with four external terminals 3.

[0039] For the convenience of description and understanding, in combination with Figures 1 to 7In the shown arrangement, the width direction of the magnetic device 100 is referred to as the first direction x, the height direction is referred to as the second direction y, and the thickness direction is referred to as the third direction z. The first direction x, the second direction y, and the third direction z are perpendicular to each other and can be regarded as three coordinate axes of a three-dimensional orthogonal coordinate system. It should be understood that the term "perpendicular" used throughout this application does not require that the included angle between the two directions be 90°, but a deviation of, for example, ±10° is allowed, that is, the so-called perpendicular can be understood as an included angle between any two directions being 80° to 100°. Similarly, the term "parallel" used throughout this application does not require that the included angle between the two directions be 0° or 180°, but a deviation of, for example, ±10° is allowed, that is, the so-called parallel can be understood as an included angle between any two directions being 0° to 10° or 170° to 190°.

[0040] The magnet 1 comprises a magnetic cover plate 10 and a magnetic core 11. The magnetic core 11 comprises a magnetic column 111 and two magnetic walls 112, which are oppositely arranged along the first direction x and are respectively connected to the two ends of the magnetic column 111. The two magnetic walls 112 can be symmetrically arranged along the central axis of the magnetic column 111 (which is parallel to the second direction y), and the structures are completely symmetrical and identical. The magnetic core 11 can be a one-piece structure.

[0041] The magnetic wall 112 can be plate-shaped or block-shaped. The first side (for example Figure 1 the upper side in the shown arrangement) of the magnetic wall 112 is connected to the magnetic cover plate 10, for example, by adhesive bonding.

[0042] The second side of the magnetic wall 112, which is oppositely arranged to the first side along the second direction y and is perpendicular to the third side, can be referred to as Figure 1 the lower side in the shown arrangement, and the third side can be referred to as Figure 1 the left side and the right side of the magnetic device 100 in the shown arrangement. The fourth side of any of the magnetic walls 112 is oppositely arranged to the third side along the first direction x and is connected to the end of the magnetic column 111, so the fourth side can be referred to as the inner side of the magnetic wall 112, and the third side can be referred to as the outer side of the magnetic wall 112. For any of the magnetic walls 112, the second side can be provided with a wire passing groove 110, for example, in the examples of Figure 2 and Figure 3 A single magnetic wall 112 can be assembled with two external terminals 3, and the single magnetic wall 112 can be provided with two wire passing grooves 110, one of which is defined by the first and second protrusions 113 and 114 oppositely arranged along the third direction z on the second side of the magnetic wall 112, and the other of which is defined by only the first protrusion 113. The other wire passing groove 110 is provided with only one groove wall, which is the side wall of the first protrusion 113.

[0043] The external terminals 3 are bonded to the corresponding magnetic walls 112, for example, in the examples of Figures 1 to 5In the example shown in FIG. 1, the magnetic device 100 is provided with four external terminals 3, two of which are attached to one of the magnetic walls 112, and the other two are attached to the other magnetic wall 112. The two external terminals 3 on each magnetic wall 112 are oppositely arranged along the third direction z by the protrusions 115 of the corresponding magnetic wall 112, which extend along the second direction y on the third side of the magnetic wall 112.

[0044] Each external terminal 3 includes a vertically connected patch electrode 31 and a side electrode 32. The patch electrode 31 is arranged on the second side of the magnetic wall 112 and is attached to the mesa of the first protrusion 113, which is the surface of the first protrusion 113 facing away from the magnet 1, i.e., the surface facing the circuit board and used for SMT mounting. The side electrode 32 is attached to the third side of the magnetic wall 112.

[0045] Each external terminal 3 can include a first portion 301 and a second portion 302 oppositely arranged along the third direction z, the top ends of the two portions are connected, the length of the first portion 301 (i.e., the length along the second direction y) is less than the length of the second portion 302, and the bottom end of the second portion 302 is bent toward the second side of the magnetic wall 112 to form the patch electrode 31, which is attached to the mesa of the first protrusion 113. It can be seen that the patch electrode 31 is only arranged on the second portion 302; the first portion 301 is only attached to the third side of the magnetic wall 112. The portions of the first portion 301 and the second portion 302 that are attached to the third side of the magnetic wall 112 serve as the side electrode 32.

[0046] The winding 2 is wound around the magnetic column 111 and located between the two magnetic walls 112. The winding 2 can be wound by turns of lead wires 20 of types such as enameled wires, and the winding manner is adaptive. In this way, the winding 2 is wound around the magnetic column 111 and assembled in the magnet 1. Each end of the lead wire 20 of the winding 2 can extend out of the magnet 1 and be welded to the corresponding external terminal 3. For example, in the example shown in FIG. 1, the winding 2 is provided with four lead wire 20 ends, and the magnetic device 100 is provided with four external terminals 3. The four external terminals 3 are different in shape. For ease of description, the same two can be referred to as first external terminals 3a, and the other two can be referred to as second external terminals 3b. Two of the lead wire 20 ends are respectively welded to two of the second external terminals 3b; one of the remaining two lead wire 20 ends is welded to one of the first external terminals 3a, and the other is welded to the other first external terminal 3a. Figures 1 to 4

[0047] The side electrode 32 includes a welding portion 321 and a main body portion 322. The main body portion 322 is vertically connected to the patch electrode 31, and the welding portion 321 is connected to one end of the main body portion 322 away from the patch electrode 31.​Figures 1 to 5 In the example shown, the welding portion 321 can be provided only on the first portion 301 of the external terminal 3, and other portions of the first portion 301 and portions of the second portion 302 other than the patch electrode 31 can be regarded as the main body portion 322. The lead wire 20 of the winding 2 extends to the third side of the magnetic wall 112 via the corresponding wire passage 110 and is welded to the welding portion 321 of the corresponding external terminal 3.

[0048] The patch electrode 31 and the side electrode 32 are arranged on opposite sides of the magnetic wall 112. When the lead wire 20 is welded to the side electrode 32, the welding point and the winding 2 are separated by the magnetic wall 112, so that the distance between them is far, the welding heat energy is difficult to transmit to the winding 2, the thermal damage to the winding 2 is small or even nonexistent, and the insulating film of the lead wire 20 is less likely to remain on the surface of the patch electrode 31, which reduces the damage to the surface plating of the patch electrode 31 and helps to ensure the close adhesion of the patch electrode 31 during SMT mounting.

[0049] In combination Figure 5 As shown, the end of the welding portion 321 is provided with a recessed area 323, such as the area shown by the dashed line in the figure. The extension direction of the recessed area 323 forms an acute angle with the length direction (i.e., the second direction y) of the welding portion 321 and also forms an acute angle with the width direction (i.e., the third direction z) of the welding portion 321. The extension direction of the recessed area 323 should be consistent with the wire-out direction (or extension direction) of the lead wire 20 as a whole, such as Figures 1 to 5 As shown, the recessed area 323 can be directed toward the patch electrode 31, or in other examples, the extension direction of the recessed area 323 can be away from the patch electrode 31, or there is no certain direction or away relationship between the patch electrode 31. In this case, when the external terminal 3 is applied to the magnetic device 100, the lead wire 20 of the winding 2 can extend into the recessed area 323 after passing through the wire passage 110 of the magnet 1 and be welded to the welding portion 321. The lead wire 20 is constrained by the recessed area 323 to prevent the lead wire 20 from falling out of the terminal area. For example, for the first external terminal 3a, since the corresponding wire passage 110 is provided with only one slot wall, the lead wire 20 is easy to slide outward and fall out of the wire passage 110. The constraint of the lead wire 20 by the recessed area 323 can eliminate the poor hanging caused by the falling, thereby reducing the risk of lead wire breakage, poor welding, and the like caused by poor hanging.

[0050] In an example, along the extension direction of the recessed area 323, the thickness of the recessed area 323 gradually increases, and the thickness on both sides of the recessed area 323 is always greater than the thickness of the recessed area 323. In this case, the recessed area 323 is equivalent to a slot with high sides and low middle, and the depth of the slot becomes shallower and shallower, which can better constrain the lead wire 20.

[0051] In an example, the magnetic device 100 can only set the recessed area 323 for a part of the external terminals 3. For example, the first external terminal 3a can be provided with the recessed area 323, while the second external terminal 3b can not be provided with the recessed area 323, in view of the fact that the first external terminal 3a corresponds to the wire passing groove 110 having only one groove wall, and the corresponding lead 20 has a large degree of bending. In contrast, the second external terminal 3b corresponds to the wire passing groove 110 having two groove walls, and the corresponding lead 20 has a small degree of bending.

[0052] Continuing to refer to Figure 5 As shown, the end edge of the welding portion 321 away from the main body portion 322 and the patch electrode 31 is provided with a beveled edge 324 and a straight edge 325. The straight edge 325 extends along the width direction of the welding portion 321, one end point of the straight edge 325 is connected to one end point of the beveled edge 324, and the other end point of the straight edge 325 and the other end point of the beveled edge 324 are respectively connected to two side edges of the welding portion 321 oppositely arranged along the width direction.

[0053] The inclination direction of the beveled edge 324 intersects with the extension direction of the recessed area 323, and forms an X shape. The provision of the beveled edge 324 is conducive to the extension of the lead 20 to the welding portion 321 according to the extension direction of the lead 20, so that the lead 20 has a small stress at the intersection of the end edge of the welding portion 321 after welding, thereby avoiding damage to the lead 20.

[0054] The distance between the straight edge 325 and the wire passing groove 210 is DO, and satisfies: 0.1mm≤DO≤0.3mm. Here, the welding portion 321 and the wire passing groove 110 are oppositely arranged along the second direction y, which is equivalent to increasing the distance between the wire passing groove 110 and the hanging line, so as to reduce or even eliminate the degree of bending of the lead 20, thereby avoiding damage to the lead 20.

[0055] Along the length direction of the welding portion 321, i.e. in the opposite direction of the second direction y, the thickness of the welding portion 321 can gradually increase and eventually equal to the maximum thickness of the side electrode 32, which is equal to the thickness of the main body portion 322. The main body portion 322 is a one-piece structure with uniform thickness. Here, the force acting on the lead 20 from the welding portion 321 in the direction away from the magnetic strength 112 is small or even non-existent, so as to reduce the stress on the lead 20 and further avoid damage to the lead 20.

[0056] Optionally, the thickness of the recessed area 323 on both sides of the recessed opening is equal to the maximum thickness of the side electrode 32, which is conducive to better guiding and restraining the lead 20.

[0057] Please continue to refer to Figures 1 to 4As shown, the thickness of the side electrode 32 between the welding portion 321 and the main body portion 322 can be reduced to form a thinning region 326. The thinning region 326 can be located on the side of the side electrode 32 facing the patch electrode 31, the magnet 1, and the magnetic wall 112, i.e., on the inner side of the side electrode 32. The thinning region 326 can be provided only on the first portion 301, or can be provided on both the first portion 301 and the second portion 302 as shown. The thinning region 326 narrows the heat transfer channel between the welding portion 321 and the main body portion 322, and can reduce the heat generated by welding of the welding portion 321 from being transferred to the main body portion 322, the second portion 302, and the patch electrode 31, i.e., achieves thermal insulation, improves or even eliminates the effects of high temperature on these portions, and reduces the risk of damage to the plating layer of the patch electrode 31.

[0058] In an example, the thickness of the thinning region 326 is m0, the thickness of the main body portion 322 is m1, and 0.3*m1≤m0≤0.6*m1 is satisfied. In this example, the structural strength and resistance characteristics of the external terminal 3 are ensured, and good thermal insulation effect is achieved at the same time.

[0059] Please continue to refer to Figure 6 and Figure 7 As shown, the width of the side electrode 32 between the welding portion 321 and the main body portion 322 can be reduced to form a narrowing region 327. Specifically, the narrowing region 327 is provided on the first portion 301 of the external terminal 3. The welding portion 321 and the main body portion 322 are connected through the narrowing region 327, and along a third direction z, which is parallel to the width direction of the side electrode 32, the width of the narrowing region 327 is smaller than the width of any one of the welding portion 321 and the main body portion 322.

[0060] Optionally, for any side electrode 32, the maximum width (i.e., the maximum width along the third direction z) of the main body portion 322 and the welding portion 321 can be equal. The side of the narrowing region 327 facing away from the second portion 302 can be recessed from the main body portion 322 and the welding portion 321. The so-called recessed can be understood as follows: on the side facing away from the second portion 302, the side edge of the narrowing region 327 and the side edge of the main body portion 322 and the welding portion 321 are not a straight line parallel to the second direction y, but are recessed toward the second portion 302.

[0061] The recessed design of the narrowing region 327 narrows the heat transfer channel between the welding portion 321 and the main body portion 322, and can reduce the heat generated by welding of the welding portion 321 from being transferred to the main body portion 322, i.e., achieves thermal insulation, improves or even eliminates the effects of high temperature on the inductance performance.

[0062] The recessed design of the narrowing region 327 can be combined with the thinning region 326 based on Figures 1 to 5The structural design of the external terminal 3 of any one of the preceding examples can be combined with, for example, Figure 6 One Figure 7 The external terminal 3 shown can also be provided with the thinning area 326 of any one of the preceding examples, which can be provided at the contraction area 327 or at the welding portion 321, specifically at the end portion of the welding portion 321 adjacent to the contraction area 327.

[0063] The present application also provides an easy-to-hang terminal, which can have the structural design of the external terminal 3 (e.g., the first external terminal 3a) of any one of the preceding examples, and thus has the beneficial effects of the corresponding external terminal 3, which will not be repeated here.

[0064] The above only describes some embodiments of the present application, and does not limit the patent scope of the present application. For those skilled in the art, any equivalent structural transformation made by using the content of the present application and the drawings is also included in the patent protection scope of the present application.

[0065] Although the terms "first", "second", and the like are used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. In addition, the singular forms "one", "a", and "the" are intended to include the plural forms. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

Claims

1. An easy-to-hang wire tab terminal characterized by comprising: The side electrode includes a main body part and a welding part, the main body part is connected with the patch electrode vertically, the welding part is connected to the end of the main body part away from the patch electrode, the end of the welding part is provided with a recessed area, the extension direction of the recessed area is acute with the length direction of the welding part and the width direction of the welding part.

2. The easy-to-hang corded terminal of claim 1, wherein The end edge of the welding part away from the main body part and the patch electrode is provided with a bevel, the extension direction of the recessed area is towards the patch electrode, the inclination direction of the bevel intersects with the extension direction of the recessed area and forms an X shape.

3. The easy-to-hang cord-type terminal according to claim 1 or 2, characterized by Along the extension direction of the recessed area, the thickness of the recessed area gradually increases, and the thickness of the two sides of the recessed area is always greater than the thickness of the recessed area.

4. The easy-to-hang corded terminal of claim 3, wherein Along the length direction of the welding part, the thickness of the welding part gradually increases and is equal to the maximum thickness of the side electrode; the thickness of the two sides of the recessed opening is equal to the maximum thickness of the side electrode.

5. The easy-to-hang corded terminal of claim 1, wherein, The thickness of the side electrode between the welding part and the main body part is reduced to form a thinning area.

6. The easy-to-hang corded terminal of claim 5, wherein, The thickness of the thinning area is m0, the thickness of the main body part is m1, and it satisfies: 0.3*m1≤m0≤0.6*m1.

7. The easy-to-hang corded terminal of claim 5, wherein, The thinning area is located on the side of the side electrode towards the patch electrode.

8. The flag terminal of claim 1, 5, 6 or 7, wherein The width of the side electrode between the welding part and the main body part is reduced to form a contraction area.

9. A magnetic device, characterized by, The magnet, the winding, and the easy-to-hang terminal of any one of claims 1 to 8, the winding is arranged in the magnetic wall of the magnet, the side of the magnetic wall towards the patch electrode is provided with a wire passing groove, the lead wire of the winding extends into the recessed area of the easy-to-hang terminal through the wire passing groove, and is welded with the welding part.

10. The magnetic device of claim 9, wherein, The end edge of the welding part is also provided with a straight edge, the straight edge extends along the width direction of the welding part, one end point of the straight edge is connected with one end point of the bevel, the other end point of the straight edge and the other end point of the bevel are respectively connected with two side edges of the welding part arranged opposite along the width direction; the distance between the straight edge and the wire passing groove is D0, and it satisfies: 0.1mm≤D0≤0.3mm.

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