Semi-magnetic part with stably bonded terminals and electromagnetic device

Abstract

The utility model provides a semi-magnetic part with stable terminal bonding and an electromagnetic device. The external terminal at least comprises a side electrode and a patch electrode, the patch electrode comprises a first part and a second part which are vertically connected, the first part is connected between the side electrode and the second part, the first part is arranged on the second side of the magnetic wall, and the side electrode is arranged on the third side of the magnetic wall; the second side and the first side of the magnetic wall are oppositely arranged in the second direction and are both perpendicular to the third side, the second part is arranged on the fourth side of the magnetic wall, and the fourth side faces the magnetic column. Therefore, the patch electrode is L-shaped and is matched with the side electrode to form a U-shaped piece, and the U-shaped piece is matched with the magnetic wall, so that the external terminal is subjected to the acting force from the magnetic wall in the direction perpendicular to the magnetic wall, the bonding area of the external terminal and the magnetic wall is increased, and the risk that the external terminal falls off from the magnet can be reduced; and the assembling stability between the external terminal and the magnet is improved.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic devices, and in particular to a semi-magnetic component with stable terminal bonding and an electromagnetic device. Background Art

[0002] With the rapid development of technology, especially the emergence of multifunctional devices, the demand for passive components is increasing. Electromagnetic devices such as inductors, as one of the passive components, are also widely used. The current demand for high current, high frequency, and high reliability of electromagnetic devices is constantly increasing. Taking the passive components used in automobiles as an example, with the continuous improvement of automotive electronics, the types and quantity of passive components are constantly increasing. They have higher requirements than ordinary passive components, mainly due to their harsher working environment, and they are required to have a longer design life, higher safety and reliability. This has led to the wider application of inductors. In traditional electromagnetic devices, the external terminals and magnets are generally bonded with glue. However, the bonding strength of glue is limited. In particular, the bonding strength of traditional high-solids glue is relatively weak. In the harsh working environment during use, it is very easy for the external terminals to fall off the magnet, resulting in product failure. Summary of the Invention

[0003] In view of this, the present application provides a semi-magnetic component and an electromagnetic device with stable terminal bonding, which can improve the problem of assembly stability between the external terminal and the magnet.

[0004] The present application provides a semi-magnetic component with stable terminal bonding, comprising:

[0005] A magnet, comprising a magnetic cover and a magnetic core, wherein the magnetic core comprises a magnetic column and two magnetic walls arranged at two ends of the magnetic column opposite to each other along a first direction, wherein a first side of the magnetic wall is connected to the magnetic cover;

[0006] A plurality of external terminals are arranged on the corresponding magnetic wall, each of the external terminals includes at least a side electrode and a patch electrode, the patch electrode includes a first part and a second part connected vertically, the first part is connected between the side electrode and the second part, the first part is arranged on the second side of the magnetic wall, the side electrode is arranged on the third side of the magnetic wall, the second side of the magnetic wall is arranged opposite to the first side along the second direction, and both are perpendicular to the third side, the second part is arranged on the fourth side of the magnetic wall, and the fourth side faces the magnetic column.

[0007] Optionally, a gap is provided on the fourth side of the magnetic wall, and the second part is provided in the gap.

[0008] Optionally, the outer side surface of the second portion is lower than the outer surface of the fourth side of the magnetic wall.

[0009] Optionally, the external terminal further comprises an extension electrode, one end of the extension electrode is connected to the side electrode, the other end of the extension electrode is bent towards the magnetic column and is oppositely arranged with the magnetic column, the extension electrode spans a fifth side of the magnetic wall along the first direction, and the fifth side is connected between the third side and the fourth side.

[0010] Optionally, the extension electrode is bonded with the coincident area of the fifth side of the magnetic wall.

[0011] Optionally, the side of the second part of the patch electrode is in contact with the extension electrode.

[0012] The electromagnetic device provided in the present application comprises a winding and the semi-magnetic element as any one of the above, the winding is wound on the magnetic column and located between the two magnetic walls, and the lead of the winding is electrically connected with the patch electrode.

[0013] Optionally, the second part of the patch electrode is oppositely arranged with the winding along the first direction.

[0014] Optionally, a part of the orthographic projection of the second part of the patch electrode falls into the orthographic projection of the winding along the first direction.

[0015] Optionally, the external terminal further comprises an extension electrode, one end of the extension electrode is connected to the patch electrode, the other end of the extension electrode is bent towards the winding and is oppositely arranged with the winding, and the other end of the extension electrode is electrically connected with the lead of the winding.

[0016] As described above, in the semi-magnetic element and the electromagnetic device of the present application, the external terminal is arranged on the corresponding magnetic wall, each external terminal comprises at least a side electrode and a patch electrode, the patch electrode comprises a first part and a second part which are vertically connected, the first part is connected between the side electrode and the second part, the first part is arranged on the second side of the magnetic wall, the side electrode is arranged on the third side of the magnetic wall, the second side and the first side of the magnetic wall are oppositely arranged along the second direction and are both perpendicular to the third side, and the second part is arranged on the fourth side of the magnetic wall, and the fourth side faces the magnetic column. Here, the patch electrode is in L shape and cooperates with the side electrode to form a U-shaped element, the U-shaped element cooperates with the magnetic wall, so that the external terminal is subjected to the force from the magnetic wall in the first direction (i.e. the direction perpendicular to the magnetic wall), and the bonding area of the external terminal with the magnetic wall is increased, thereby reducing the risk of the external terminal falling off the magnet and improving the assembly stability between the external terminal and the magnet. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a three-dimensional structure schematic diagram of the first perspective of the electromagnetic device of the first embodiment of the present application;

[0018] Figure 2 is Figure 1 a perspective view of the electromagnetic device from a second angle;

[0019] Figure 3 is Figure 1 a bottom view of the electromagnetic device;

[0020] Figure 4 is Figure 2 a perspective view of the electromagnetic device with additional electrodes in a first position;

[0021] Figure 5 is Figure 4 a bottom view of the electromagnetic device;

[0022] Figure 6 is Figure 2 a perspective view of the electromagnetic device without soldering;

[0023] Figure 7 is Figure 1 a perspective view of the electromagnetic device with an external terminal;

[0024] Figure 8 is Figure 7 a perspective view of the external terminal with additional electrodes in a first position;

[0025] Figure 9 is Figure 1 a perspective view of the electromagnetic device without an external terminal;

[0026] Figure 10 is a perspective view of the electromagnetic device from a first angle according to a second embodiment;

[0027] Figure 11 is Figure 10 a perspective view of the electromagnetic device from a second angle;

[0028] Figure 12 is Figure 10 a bottom view of the electromagnetic device;

[0029] Figure 13 is Figure 12 a perspective view of the electromagnetic device with additional electrodes in a first position;

[0030] Figure 14 is Figure 13 a bottom view of the electromagnetic device;

[0031] Figure 15 is Figure 10 a perspective view of the electromagnetic device with an external terminal;

[0032] Figure 16 is Figure 15 An additional electrode of the external terminal shown in the structure schematic view when the first position.

[0033] The first direction x, the second direction y, the third direction z;

[0034] The electromagnetic device 100;

[0035] The magnet 1, the gap 1a, the magnetic cover plate 10, the magnetic column 111, the magnetic wall 112, the protrusion 113;

[0036] The winding 2, the lead wire 20, the solder 21;

[0037] The external terminal 3;

[0038] The welding part 30, the patch electrode 31, the side electrode 32, the extension electrode 33, the necking area 34;

[0039] The first part 311, the second part 312;

[0040] The first part 301, the second part 302, the recess area 303. DETAILED DESCRIPTION

[0041] To solve the above technical problems existing in the prior art, in the semi-magnetic piece and the electromagnetic device of the present application, the external terminal is arranged on the corresponding magnetic wall, each external terminal at least includes a side electrode and a patch electrode, the patch electrode includes a first part and a second part connected vertically, the first part is connected between the side electrode and the second part, the first part is arranged on the second side of the magnetic wall, the side electrode is arranged on the third side of the magnetic wall, the second side and the first side of the magnetic wall are arranged opposite along the second direction and are both perpendicular to the third side, the second part is arranged on the fourth side of the magnetic wall, and the fourth side faces the magnetic column. Here, the patch electrode is L-shaped and cooperates with the side electrode to form a U-shaped piece, which cooperates with the magnetic wall, so that the external terminal is subjected to the force from the magnetic wall in the first direction (i.e. the direction perpendicular to the magnetic wall), and the bonding area of the external terminal and the magnetic wall is increased, thereby reducing the risk of the external terminal falling off the magnet and improving the assembly stability between the external terminal and the magnet.

[0042] The specific forms of the shape, number, size, etc. of any of the magnet, the external terminal and each electrode thereof can be determined according to the actual scene as needed, which is not limited in the present application.

[0043] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly described below with specific embodiments and corresponding drawings. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. In the case of no conflict, various embodiments described below and their technical features can be combined with each other, and also belong to the technical solutions of the present application.

[0044] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the technical solutions of the corresponding embodiments, and do not indicate or imply that the devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as a limitation of the present application.

[0045] First embodiment

[0046] Please refer to Figures 1 to 9 As shown in the figure, the electromagnetic device 100 of the present example includes a magnet 1, a winding 2 and a plurality of external terminals 3. The number of external terminals 3 can be adapted according to the type of electromagnetic device 100, for example, the common mode inductance shown in the figure can be provided with four external terminals 3.

[0047] Among them, the magnet 1 and the plurality of external terminals 3 constitute a semi-finished product of the electromagnetic device 100, so it can be called "semi-magnetic device", "terminal bonding stable semi-magnetic device".

[0048] For the convenience of description and understanding, in combination with the placement orientation shown in the figure, the width direction of the electromagnetic device 100 is called the first direction x, the height direction is called the second direction y, and the thickness direction is called the third direction z. The first direction x, the second direction y and the third direction z are perpendicular to each other, which can be regarded as three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that the perpendicularity in the whole text of the present application does not require that the included angle between the two must be 90°, but allows a deviation of, for example, ±10°, that is, the so-called perpendicularity can be understood as the included angle between any two directions being 80° to 100°. Similarly, the parallelism in the whole text also does not require that the included angle between the two must be 0° or 180°, but allows a deviation of, for example, ±10°, that is, the so-called parallelism can be understood as the included angle between any two directions being 0° to 10° or 170° to 190°.

[0049] The magnet 1 comprises a magnetic cover plate 10 and a magnetic core, and has a closed magnetic circuit. The magnetic core comprises a magnetic column 111 and two magnetic walls 112, which are oppositely arranged along a first direction x and connected to two ends of the magnetic column 111 respectively. The two magnetic walls 112 can be symmetrically arranged along the central axis of the magnetic column 111 (the central axis is parallel to a second direction y), and the structure is completely symmetrical and identical. The magnetic core can be an integrally formed structure.

[0050] The magnetic wall 112 can be in the form of a plate or a block. The first side (for example, 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, so as to form the magnet 1 with a complete closed magnetic circuit. The second side (for example, the lower side in the shown arrangement) of the magnetic wall 112 is oppositely arranged to the first side along the second direction y and is perpendicular to the third side. The third side (for example, the left side and the right side of the electromagnetic device 100 in the shown arrangement) of the magnetic wall 112 is perpendicular to the first side and the second side. Figure 1 Figure 1 The fourth side of the magnetic wall 112 is oppositely arranged to the third side along the first direction x and is connected to the end of the magnetic column 111. Figure 1 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 a lead wire 20 such as an enameled wire, and the winding manner is adaptive. The winding 2 is wound around the magnetic column 111 and assembled in the magnet 1. The ends of the lead wire 20 of the winding 2 can extend out of the magnet 1 and electrically connected to the corresponding external terminals 3, for example, by welding. For example, in the shown example, the electromagnetic device 100 is a common mode inductor, the winding 2 is provided with four ends of the lead wire 20, and the electromagnetic device 100 is provided with four external terminals 3. The four ends of the lead wire 20 are electrically connected to the four external terminals 3 one by one respectively.

[0051] Figures 1 to 5 The external terminals 3 are adhered to the corresponding magnetic walls 112. At least two external terminals 3 are arranged on the same magnetic wall 112. For example, in the shown example, the electromagnetic device 100 is provided with four external terminals 3, two external terminals 3 are adhered to one magnetic wall 112, and the other two external terminals 3 are adhered to the other magnetic wall 112. The two external terminals 3 on each magnetic wall 112 are oppositely arranged along a third direction z. The shapes of the four external terminals 3 can be the same or different. For the convenience of description, the shapes of the four external terminals 3 are the same in all the drawings and examples of the present application.

[0052] The external terminals 3 are adhered to the corresponding magnetic walls 112. At least two external terminals 3 are arranged on the same magnetic wall 112. For example, in the shown example, the electromagnetic device 100 is provided with four external terminals 3, two external terminals 3 are adhered to one magnetic wall 112, and the other two external terminals 3 are adhered to the other magnetic wall 112. The two external terminals 3 on each magnetic wall 112 are oppositely arranged along a third direction z. The shapes of the four external terminals 3 can be the same or different. For the convenience of description, the shapes of the four external terminals 3 are the same in all the drawings and examples of the present application. Figures 1 to 6

[0053] Figure 7 Figure 8 ​​​​​As shown, each of the external terminals 3 comprises at least a patch electrode 31 and a side electrode 32, and the patch electrode 31 and the side electrode 32 are connected perpendicularly, and can both be in a patch shape. The patch electrode 31 is arranged (e.g. adhered) at least on the second side of the corresponding magnetic wall 112, and faces the circuit board and is used for performing SMT mounting, and the side electrode 32 is adhered on the third side of the corresponding magnetic wall 112.

[0054] The patch electrode 31 comprises a first part 311 and a second part 312 connected perpendicularly, the first part 311 is arranged between the side electrode 32 and the second part 312, the first part 311 is arranged on the second side of the magnetic wall 112, and the second part 312 is arranged on the fourth side of the magnetic wall 112.

[0055] Here, the patch electrode 31 is in an L shape, and cooperates with the side electrode 32 to form a U-shaped piece, which cooperates with the magnetic wall 112, so that the external terminal 3 is subjected to a force from the magnetic wall 112 in a direction perpendicular to the magnetic wall 112 (i.e. the first direction x or the horizontal direction), and the bonding area between each external terminal 3 and the corresponding magnetic wall 112 is increased, thereby reducing the risk of the external terminal 3 falling off the magnet 1, and improving the assembly stability between the external terminal 3 and the magnet 1.

[0056] In the example as shown in Figure 1 and Figure 8 The fourth side of the magnetic wall 112 facing the winding 2 can be provided with a notch 1a, and the second part 312 of the patch electrode 31 is arranged in the notch 1a, so as to increase the distance between the second part 312 and the winding 2, and avoid the risk of possible short circuit.

[0057] Optionally, the outer side of the second part 312 is lower than the outer surface of the fourth side of the magnetic wall 112, i.e. the thickness of the second part 312 is less than the depth of the notch 1a in the first direction x. The lead 20 of the final product extending out of the winding 2 can also be accommodated in the notch 1a.

[0058] Please continue to refer to Figures 1 to 8 As shown, the external terminal 3 can further comprise an extension electrode 33. One end of the extension electrode 33 is connected perpendicularly to the patch electrode 31, and the extension electrode 33 is arranged on the fourth side of the corresponding magnetic wall 112. The extension electrode 33 is provided with an electrical connection part 30, and the lead 20 of the winding 2 is electrically connected to the electrical connection part 30, for example, the lead 20 of the winding 2 is wound around the electrical connection part 30 and is welded to the electrical connection part 30, for example, by laser welding, and the soldering 21 during welding and the lead 20 melted due to high temperature during welding form a Figures 1 to 5The illustrated pimple structure. In other examples, the lead 20 of the winding 2 and the electrical connection portion 30 can also achieve the electrical connection through conductive adhesive bonding. The embodiments of the present application and the drawings take the lead 20 winding on the electrical connection portion 30 and welding with the electrical connection portion 30 to achieve the electrical connection as an example for description, and at this time the electrical connection portion 30 can also be referred to as the welding portion 30. Figure 1 In the example, one end of the extension electrode 33 is connected to the patch electrode 31, which can be regarded as the extension electrode 33 being connected to the side of the patch electrode 31, and the electrical connection portion 30 is arranged at the other end of the extension electrode 33. In the example in which the extension electrode 33 includes two parts, the other part can be regarded as the other end of the extension electrode 33.

[0059] In combination with Figure 4 , Figure 5 and Figure 8 illustrated, the extension electrode 33 can be bent to a first position relative to the patch electrode 31 and the side electrode 32, at this time, the extension electrode 33 as a whole is in a flat sheet shape, and for the external terminal 3, the initial state is the state illustrated in Figure 4 , Figure 5 and Figure 8 illustrated, the extension electrode 33 can also be regarded as not being bent, and the other end of the extension electrode 33 is away from the winding 2 when the extension electrode 33 is bonded to the magnet 1. As Figure 4 and Figure 5 illustrated, in the first position, the electrical connection portion 30 and the lead 20 wound thereon are located outside the two magnetic walls 112, i.e., outside the magnet 1.

[0060] In the first position, the electromagnetic device 100 is in a semi-finished product state, at this time, the winding of the lead 20 on the electrical connection portion 30 and the welding with the electrical connection portion 30 have been completed.

[0061] The extension electrode 33 can be bent to a second position relative to the patch electrode 31 and the side electrode 32 via the first position as Figure 4 and Figure 5 illustrated, as Figures 1 to 3 illustrated. In the second position, the electrical connection portion 30 and the lead 20 wound thereon are located between the two magnetic walls 112 and are arranged opposite to the winding 2. When the extension electrode 33 is bent to the second position, it can be regarded as the final product state of the electromagnetic device 100.

[0062] In the finished electromagnetic device 100, the second part 312 of the patch electrode 31 is arranged opposite the winding 2 along the first direction x, and a certain distance is provided between the second part 312 and the winding 2 to avoid possible short circuit risk. In addition, along the first direction x, a part of the orthographic projection of the second part 312 of the patch electrode 31 falls within the orthographic projection of the winding 2, i.e., the second part 312 of the patch electrode 31 partially overlaps the winding 2. In the third direction z, the total length occupied by the second part 312 of the patch electrode 31 and the winding 2 is less than the sum of the lengths of the two, which is conducive to controlling the length of the entire electromagnetic device 100 in the third direction z.

[0063] Based on the above, when the extension electrode 33 is located at the first position, the electrical connection part 30 of the extension electrode 33 is located outside the two magnetic walls 112, and the distance between the electrical connection part 30 and the winding 2 is far. At this time, the lead wire 20 of the winding 2 is wound on the electrical connection part 30 and welded. The high temperature generated by welding will not affect the lead wire 20 in the winding 2, and damage to the lead wire 20 in the winding 2 can be avoided.

[0064] After the extension electrode 33 is bent from the first position to the second position, the electrical connection part 30 and the lead wire 20 wound thereon are located between the two magnetic walls 112 and arranged opposite the winding 2. Even if the lead wire 20 between the winding 2 and the welding point (or the electrical connection part 20) is in a tight state at the first position, when the extension electrode 33 is bent towards the winding 2 to the second position, the distance between the winding 2 and the welding point becomes smaller, and the lead wire 20 at this position will not be in a tight state, but will be in a curved or arc state with a certain curvature. Thus, the internal stress remaining after winding and extension of the lead wire 20 can be eliminated, and the stress generated in the entire electromagnetic device 100 during use can be easily absorbed. In addition, the electrical connection part 20 is located between the two magnetic walls 112, i.e., inside the magnet 1 or the inner side of the magnetic wall 112, which can eliminate the risk of failure of the welding point of the entire electromagnetic device 100 due to impact during use. As can be seen, the present application can reduce the risk of the lead wire 20 of the winding 2 being pulled off, and the risk of product failure caused thereby.

[0065] Optionally, the relative distance between the electrical connection part 30 and the winding 2 is DO, i.e., the distance along the third direction z is DO, and DO≥0.05mm. This can not only ensure good electrical insulation between the electrical connection part 30 and the winding 2, but also enable the electrical connection part 30 to extend more into the interior of the magnet 1, which is further conducive to eliminating the risk of failure of the welding point of the entire electromagnetic device 100 due to impact during use.

[0066] Please refer to Figures 1 to 8As shown, the connection between the two parts of the extension electrode 33 can be provided with a necking region 34, the width of the necking region 34 is D1, the width of the two parts is D2, the width of the three refers to the length along the second direction y, and satisfies: D1 < D2; optionally, the width D1 of the necking region 34 also satisfies: 0.1*D2≤D1≤0.95*D2. The necking region 34 is equivalent to narrowing the heat transfer channel between the two parts of the extension electrode 33, which can reduce the heat generated by the welding of the electrical connection part 30 to the other part of the extension electrode 33, the patch electrode 31 and the electromagnetic device 100, that is, to achieve thermal isolation, and improve or even eliminate the influence of high temperature on the inductance performance.

[0067] In addition, the necking region 34 is equivalent to reducing the structural strength between the electrical connection part 30 and the patch electrode 31, and the extension electrode 33 can be bent relative to the patch electrode 31 at the necking region 34 to switch between the first position and the second position, that is, the necking region 34 can be regarded as a bending line for bending, and the side of the electrical connection part 30 is facilitated to be pushed and folded.

[0068] Please refer to Figure 7 and Figure 8 As shown, the electrical connection part 30 can be provided with a first part 301 and a second part 302, the width of the first part 301 is smaller than the width of the second part 302, that is, the first part 301 and the second part 302 have a height difference along the second direction y, so that the first part 301 and the second part 302 form a stepped structure. In the example shown in the figure, the upper part of the first part 301 and the upper part of the second part 302 form a stepped structure, and the lower part of the first part 301 and the lower part of the second part 302 also form a stepped structure, and the height difference of the stepped structures at the two places can be equal. The lead wire 20 is wound on the first part 301. The stepped structure is beneficial to the winding of the lead wire 20.

[0069] Optionally, the step height of the stepped structure is H1, that is, the height difference between the upper side or the lower side of the first part 301 and the second part 302 along the second direction y is H1, and the diameter of the lead wire 20 is φ, and H1≥0.2*φ; the height difference H1 in this value range is more beneficial to the winding of the lead wire 20.

[0070] In an example, the first part 301 can be provided with a recessed region 303, and the recessed direction (or depth direction) of the recessed region 303 is parallel to the width direction of the first part 301, that is, the first direction x. The recessed region 303 facilitates the lead wire 20 to be wound on the electrical connection part 30 more closely to the first part 301. Optionally, the x-y cross section of the recessed region 303 includes but is not limited to V-shaped, circular arc-shaped.

[0071] Optionally, the recessed area 303 has a depth H2, and H2 ≥ 0.02 mm. The recessed depth H2 within this range can ensure that the lead 20 is more closely attached to the first subsection 301 when wound around the electrical connection portion 30, ensuring the winding stability of the lead 20, and also ensuring the structural strength of the first subsection 301.

[0072] For electromagnetic devices 100 such as common mode inductors, the winding 2 may include at least two coils, see Figure 2 and Figure 3 As shown, taking two coils as an example, the winding 2 includes a first coil and a second coil, and the magnetic column 111 can be provided with a protrusion 113, which protrudes from the main body of the magnetic column 111. The protrusion 113 is located between the first coil and the second coil. The protrusion 113 is provided with at least one wire groove (not shown in the figure), for example, provided on the bottom surface of the protrusion 113, and the wire groove is used to accommodate the lead 20 extending from one of the first coil and the second coil toward the other. The protrusion 113 can constrain each coil and its lead 20, prevent the winding 2 from slipping and scattering between layers, and prevent crossing caused by slipping and scattering, thereby improving the consistency and stability of the product.

[0073] Second embodiment

[0074] For structural elements with the same name, the same reference numerals are used in this application to identify them.

[0075] Based on the description of the electromagnetic device 100 of the first embodiment, the difference lies in that, in the electromagnetic device 100 of the second embodiment, each external terminal 3 also includes a vertically connected patch electrode 31 and a side electrode 32, both in the form of a sheet, and an extension electrode 33. However, one end of the extension electrode 33 is connected to the side electrode 32, and the other end of the extension electrode 33 is bent toward the magnetic column 111 and the winding 2 and disposed opposite the magnetic column 111 and the winding 2. The extension electrode 33 spans the fifth side of the magnetic wall 112 along the first direction x, and the fifth side is connected between the third and fourth sides. Thus, based on the first embodiment, the external terminals 3 of the second embodiment are also subject to forces from the magnetic wall 112 in the front-to-back direction (i.e., the third direction z) of the magnetic wall 112. This further increases the bonding area between each external terminal 3 and the corresponding magnetic wall 112, thereby further reducing the risk of the external terminal 3 falling off the magnet 1 and enhancing the assembly stability between the external terminal 3 and the magnet 1.

[0076] Optionally, the extended electrode 33 is bonded to the overlapping area of ​​the fifth side of the magnetic wall 112 .

[0077] Optionally, a side surface of the second portion 312 of the patch electrode 31 contacts the extended electrode 33 to prevent the extended electrode 33 from being excessively bent toward the winding 2 .

[0078] The other end of the extension electrode 33 is also provided with an electrical connection portion 30 .

[0079] Combine Figures 10 to 16 As shown, the extension electrode 33 can be positioned relative to the side electrode 32 as shown in FIG. Figure 13 and Figure 14 In the first position shown in FIG, after the lead wire 20 is wound and welded to the electrical connection portion 30 at the first position, the extension electrode 33 can be bent relative to the side electrode 32 to the position shown in FIG. Figures 10 to 12 The second position is shown. In the first position, the electrical connection portion 30 and the lead wire 20 wound thereon are located outside the two magnetic walls 112. In the second position, the electrical connection portion 30 and the lead wire 20 wound thereon are located between the two magnetic walls 112 and opposite the winding 2. When the extension electrode 33 is bent to the second position, the electromagnetic device 100 is in its final product state. Thus, the electromagnetic device 100 of this second embodiment also achieves the beneficial effects of the first embodiment.

[0080] The above descriptions are only some embodiments of the present application and do not limit the patent scope of the present application. For ordinary technicians in this field, any equivalent structural changes made using the contents of this specification and drawings are also included in the patent protection scope of the present application.

[0081] Although the terms "first," "second," and the like are used herein to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. In addition, the singular forms "a," "an," and "the" are intended to include the plural forms as well. The terms "or" and "and / or" are to be interpreted as inclusive, meaning any one or any combination. Exceptions to this definition occur only when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some manner.

Claims

1. A semi-magnetic component with stable terminal bonding, characterized in that: include: A magnet, comprising a magnetic cover and a magnetic core, wherein the magnetic core comprises a magnetic column and two magnetic walls arranged at two ends of the magnetic column opposite to each other along a first direction, wherein a first side of the magnetic wall is connected to the magnetic cover; A plurality of external terminals are arranged on the corresponding magnetic wall, each of the external terminals includes at least a side electrode and a patch electrode, the patch electrode includes a first part and a second part connected vertically, the first part is connected between the side electrode and the second part, the first part is arranged on the second side of the magnetic wall, the side electrode is arranged on the third side of the magnetic wall, the second side of the magnetic wall is arranged opposite to the first side along the second direction, and both are perpendicular to the third side, the second part is arranged on the fourth side of the magnetic wall, and the fourth side faces the magnetic column.

2. The half magnetic piece according to claim 1, characterized in that: A gap is provided on the fourth side of the magnetic wall, and the second part is provided in the gap.

3. The half magnetic piece according to claim 2, characterized in that: The outer side surface of the second portion is lower than the outer surface of the fourth side of the magnetic wall.

4. The magnetic half according to any one of claims 1 to 3, characterized in that: The external terminal also includes an extended electrode, one end of which is connected to the side electrode, and the other end of which is bent toward the magnetic column and arranged opposite to the magnetic column. The extended electrode spans the fifth side of the magnetic wall along the first direction, and the fifth side is connected between the third side and the fourth side.

5. The half magnetic piece according to claim 4, characterized in that: The extended electrode is bonded to an overlapping area of ​​the fifth side of the magnetic wall.

6. The half magnetic piece according to claim 4, characterized in that: A side surface of the second portion of the patch electrode contacts the extension electrode.

7. An electromagnetic device, characterized in that: It comprises a winding and a half-magnetic component as claimed in any one of claims 1 to 6, wherein the winding is wound around the magnetic column and located between the two magnetic walls, and the lead of the winding is electrically connected to the patch electrode.

8. The electromagnetic device according to claim 7, characterized in that The second portion of the patch electrode is arranged opposite to the winding along the first direction.

9. The electromagnetic device according to claim 8, characterized in that Along the first direction, a portion of the orthographic projection of the second portion of the patch electrode falls within the orthographic projection of the winding.

10. The electromagnetic device according to claim 7, characterized in that The external terminal further includes an extended electrode, one end of which is connected to the patch electrode, the other end of which is bent toward the winding and disposed opposite to the winding, and the lead of the winding is electrically connected to the other end of the extended electrode.

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