Coil component

Abstract

The invention provides a coil assembly. The coil component includes: a body including a first surface and a second surface opposite to each other in a first direction, and a third surface and a fourth surface connected to the first surface and the second surface and opposite to each other in a second direction; a coil disposed in the main body; an external electrode disposed on the main body and connected to the coil; and a first heat dissipation portion disposed on the first surface, in which the main body includes a groove disposed in a region between the first heat dissipation portion and the external electrode.

Description

[0001] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0116534 filed on September 1, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. Technical Field

[0002] The present disclosure relates to a coil assembly. Background Art

[0003] Inductors, coil components may be typical passive electronic components used in electronic devices along with resistors and capacitors.

[0004] As electronic devices have been designed to have high performance and reduced size, the number of electronic components used in the electronic devices has increased and the sizes of the electronic components used in the electronic devices have decreased.

[0005] A high-capacity inductor may require a heat dissipation structure to effectively remove heat generated due to high voltage and high current. When a heat dissipation pad is directly disposed on a coil component, it may be important to prevent a short circuit or current leakage between the external electrode and the heat dissipation pad. Summary of the invention

[0006] An aspect of the present disclosure is to improve heat dissipation effect by providing a heat dissipation portion on a surface of a body of a coil component, and to ensure insulation between an external electrode and the heat dissipation portion to prevent a short circuit or current leakage.

[0007] Another aspect of the present disclosure is to reduce magnetic flux loss caused by providing a heat sink on the body.

[0008] According to one aspect of the present disclosure, a coil component includes: a main body, including a first surface and a second surface opposite to each other in a first direction, and a third surface and a fourth surface connected to the first surface and the second surface and opposite to each other in a second direction; a coil arranged in the main body; an external electrode arranged on the main body and connected to the coil; and a first heat dissipation portion arranged on the first surface, wherein the main body includes a groove arranged in an area between the first heat dissipation portion and the external electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other aspects, features and advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which: Figure 1 is a perspective view showing a coil component according to a first embodiment of the present disclosure; Figure 2 is along Figure 1A cross-sectional view taken along line II' in FIG. 1 and an enlarged view showing a groove and a recess according to a first embodiment of the present disclosure; Figure 3 It is along Figure 1 A cross-sectional view taken along line II-II'; Figure 4 is shown as viewed from below Figure 1 A diagram of the example shown; Figure 5 is with Figure 2 Correspondingly, a diagram showing a coil component according to a second embodiment of the present disclosure is shown; Figure 6 is with Figure 5 A diagram correspondingly showing a coil component according to a modified example of the second embodiment of the present disclosure; Figure 7 is with Figure 2 A diagram correspondingly showing a coil component according to a third embodiment of the present disclosure; and Figure 8 is with Figure 2 Correspondingly, a diagram of a coil component according to a fourth embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0010] Hereinafter, embodiments of the present disclosure will be described as follows with reference to the accompanying drawings.

[0011] However, the present disclosure can be illustrated in many different forms and should not be construed as being limited to the specific embodiments set forth herein. Unless the context has a significantly different meaning, the expression used in the singular encompasses the expression of the plural. The terms "comprise", "include", "be constructed as", etc. of the specification are used to indicate that there are described features, quantities, steps, operations, elements, parts, or combinations thereof, and do not exclude the possibility of combining or adding one or more other features, quantities, steps, operations, elements, parts, or combinations thereof. In addition, the expression that the element is set "on..." may indicate that the element may be set above or below the target portion, and does not necessarily indicate that the element is set above the target portion in the direction of gravity.

[0012] It should be understood that when an element is “coupled to” or “connected to” another element, the element may be directly coupled to or “directly coupled to” another element, and there may be intervening elements between the element and the other element. Conversely, it should be understood that when an element is “directly coupled to” or “directly coupled to” another element, or an element is “directly connected to” or “directly connected to” another element, there are no intervening elements between the element and the other element.

[0013] The structures, shapes, and sizes described as examples in the embodiments of the present disclosure may be implemented in another exemplary embodiment without departing from the spirit and scope of the present disclosure.

[0014] In the drawings, a T direction may be defined as a first direction or a thickness direction, an L direction may be defined as a second direction or a length direction, and a W direction may be defined as a third direction or a width direction.

[0015] In the accompanying drawings, the same elements will be denoted by the same reference numerals. In addition, redundant descriptions and detailed descriptions of known functions and elements that may unnecessarily obscure the gist of the present disclosure will not be provided.

[0016] Various types of electronic components are used in electronic devices, and various types of coil components may be appropriately used between these electronic components for the purpose of removing noise.

[0017] That is, in electronic devices, coil components can be used as power inductors, high frequency (HF) inductors, ordinary magnetic beads, high frequency magnetic beads (for example, magnetic beads suitable for GHz bands), common mode filters, etc.

[0018] Figure 1 is a perspective view showing a coil component according to a first embodiment. Figure 2 is along Figure 1 A sectional view taken along line II' in FIG. 1 and an enlarged view showing the groove and the recess according to the first embodiment. Figure 3 It is along Figure 1 A cross-sectional view taken along line II-II'. Figure 4 is shown as viewed from below Figure 1 Schematic diagram of the example shown.

[0019] Reference Figures 1 to 4 The coil component 1000 according to the first embodiment may include a body 100 , a coil 300 , external electrodes 410 and 420 , and heat dissipation parts 610 and 620 , and may further include insulating layers 510 and 520 and a support member 200 .

[0020] In the coil component 1000 according to the embodiment, the heat dissipation parts 610 and 620 respectively provided on the first surface 101 and the second surface 102 (described below) of the body 100 may be provided so that heat generated in the coil component 1000 when powered on may be quickly dissipated to the outside.

[0021] In addition, by providing grooves G1 and G2 or recesses R1 and R2 in the area between the external electrodes 410 and 420 and the heat dissipation parts 610 and 620 provided on the body 100, clearance and creepage distance can be ensured, so that the risk of short circuit or current leakage between the external electrodes 410 and 420 and the heat dissipation parts 610 and 620 can be reduced. In the present disclosure, for the convenience of description, the grooves provided at different positions of the body are respectively referred to as grooves and recesses. However, the present disclosure is not limited thereto. That is, the recesses R1 and R2 may also be referred to as grooves R1 and R2.

[0022] Here, the spacing may refer to the shortest distance across air between two adjacent conductors, and the creepage distance may refer to the shortest distance along the surface of an insulating material between two adjacent conductors. The spacing and creepage distance may be indicators of insulation reliability.

[0023] In the coil component 1000 according to the embodiment, the first heat dissipation portion 610 can be set on the first surface 101 of the body 100 corresponding to the mounting surface, and the grooves G1 and G2 can be set between both ends of the first heat dissipation portion 610 and the external electrodes 410 and 420, so that excellent heat dissipation effect and insulation reliability can be ensured.

[0024] Furthermore, by disposing the second heat dissipation portion 620 on the second surface 102 of the body 100 corresponding to the upper surface and disposing the recesses R1 and R2 between both ends of the second heat dissipation portion 620 and the external electrodes 410 and 420 , heat dissipation effect and insulation reliability can be improved.

[0025] In the following description, main components included in the coil component 1000 according to the embodiment will be described in more detail.

[0026] In an embodiment, the body 100 may form the exterior of the coil component 1000 , and the coil 300 and the support member 200 may be embedded in the body 100 .

[0027] The body 100 may have a generally hexahedral shape.

[0028] The body 100 may include a first surface 101 and a second surface 102 opposite to each other in a thickness direction (T direction, first direction), a third surface 103 and a fourth surface 104 connected to the first surface 101 and the second surface 102 and opposite to each other in a length direction (L direction, second direction), and a fifth surface 105 and a sixth surface 106 connected to the first surface 101 to the fourth surface 104 and opposite to each other in a width direction (W direction, third direction). Each of the third surface 103, the fourth surface 104, the fifth surface 105, and the sixth surface 106 of the body 100 may be a wall surface of the body 100 connecting the first surface 101 and the second surface 102. In the present disclosure, the first surface 101 to the sixth surface 106 are defined for the convenience of description. However, the present disclosure is not limited thereto. For example, the first surface of the body 100 may also refer to Figure 1 The upper surface of the main body 100 in the embodiment of the present invention, and the second surface of the main body 100 may also refer to Figure 1 The lower surface of the main body 100 in the embodiment of the present invention.

[0029] The body 100 may be formed such that the coil component in which the external electrodes 410 and 420 are formed may have a length of 2.5 mm, a width of 2.0 mm, and a thickness of 0.8 mm, a length of 2.0 mm, a width of 1.2 mm, and a thickness of 0.6 mm, a length of 2.0 mm, a width of 0.8 mm, and a thickness of 0.6 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.6 mm, a length of 1.6 mm, a width of 0.8 mm, and a thickness of 0.4 mm, a length of 1.4 mm, a width of 1.2 mm, and a thickness of 0.65 mm, a length of 1.0 mm, a width of 0.7 mm, and a thickness of 0.65 mm, a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.65 mm, or a length of 0.8 mm, a width of 0.4 mm, and a thickness of 0.5 mm, but embodiments thereof are not limited thereto. Since the above exemplary dimensions of the length, width, and thickness of the coil component 1000 may refer to dimensions that do not reflect process errors, dimensions within the range identified as process errors may correspond to the above exemplary dimensions.

[0030] The length of the coil component 1000 may be: based on an optical microscope image or a scanning electron microscope (SEM) image of a cross section in the length direction-thickness direction taken from the central portion of the coil component 1000 in the width direction, the maximum value of the sizes of the multiple line segments that connect the two outermost boundary lines of the coil component 1000 that are opposite to each other in the length direction and are parallel to the length direction. Optionally, the length of the coil component 1000 may refer to the minimum value of the sizes of the multiple line segments. Optionally, the length of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the multiple line segments. Here, the multiple line segments parallel to the length direction may be spaced apart from each other by equal distances in the thickness direction, but embodiments thereof are not limited thereto.

[0031] The thickness of the coil component 1000 may be: based on an optical microscope image or a scanning electron microscope (SEM) image of a cross section in the length direction-thickness direction taken from the central portion of the coil component 1000 in the width direction, the maximum value of the sizes of the multiple line segments that connect the two outermost boundary lines of the coil component 1000 that are opposite to each other in the thickness direction and are parallel to the thickness direction. Optionally, the thickness of the coil component 1000 may refer to the minimum value of the sizes of the multiple line segments. Optionally, the thickness of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the multiple line segments. Here, the multiple line segments parallel to the thickness direction may be spaced apart from each other by equal distances in the length direction, but embodiments thereof are not limited thereto.

[0032] The width of the coil component 1000 may be: based on an optical microscope image or a scanning electron microscope (SEM) image of a cross section in the length direction-width direction taken from the central portion of the coil component 1000 in the thickness direction, the maximum value of the sizes of the multiple line segments that connect the two outermost boundary lines of the coil component 1000 that are opposite to each other in the width direction and are parallel to the width direction. Optionally, the width of the coil component 1000 may refer to the minimum value of the sizes of the multiple line segments. Optionally, the width of the coil component 1000 may refer to the arithmetic mean of three or more of the sizes of the multiple line segments. Here, the multiple line segments parallel to the width direction may be spaced apart from each other by equal distances in the length direction, but embodiments thereof are not limited thereto.

[0033] Optionally, each of the length, width, and thickness of the coil component 1000 can be measured by a micrometer measurement method. The micrometer measurement method can be performed by determining the zero point with a metrological repeatability and reproducibility (R&R) micrometer, inserting the coil component 1000 in the embodiment between the tips of the micrometer, and measuring by rotating the measuring rod of the micrometer. When measuring the length of the coil component 1000 by the micrometer measurement method, the length of the coil component 1000 may refer to a value measured once, or may refer to an arithmetic mean of values ​​measured multiple times, which may also apply to the width and thickness of the coil component 1000.

[0034] The main body 100 may include a magnetic material and a resin. Specifically, the main body 100 may be formed by laminating one or more magnetic composite sheets in which a magnetic material is dispersed in an insulating resin. The main body 100 may have a structure other than a structure in which a magnetic material is dispersed in an insulating resin. For example, the main body 100 may be formed using a magnetic material such as ferrite.

[0035] The magnetic material may be ferrite powder or magnetic metal powder.

[0036] The ferrite powder may be, for example, at least one of spinel ferrite (such as Mg-Zn-based ferrite, Mn-Zn-based ferrite, Mn-Mg-based ferrite, Cu-Zn-based ferrite, Mg-Mn-Sr-based ferrite, Ni-Zn-based ferrite), hexagonal ferrite (such as Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite, Ba-Ni-Co-based ferrite), garnet-type ferrite (such as Y-based ferrite) and Li-based ferrite.

[0037] The magnetic metal powder may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the magnetic metal powder may be at least one of pure iron powder, Fe-Si-based alloy powder, Fe-Si-Al-based alloy powder, Fe-Ni-based alloy powder, Fe-Ni-Mo-based alloy powder, Fe-Ni-Mo-Cu-based alloy powder, Fe-Co-based alloy powder, Fe-Ni-Co-based alloy powder, Fe-Cr-based alloy powder, Fe-Cr-Si-based alloy powder, Fe-Si-Cu-Nb-based alloy powder, Fe-Ni-Cr-based alloy powder, and Fe-Cr-Al-based alloy powder.

[0038] The magnetic metal powder may be amorphous or crystalline. For example, the magnetic metal powder may be Fe-Si-B-Cr based amorphous alloy powder, but the embodiment is not limited thereto.

[0039] The magnetic metal powder may have an average diameter of about 0.1 μm to about 30 μm, but embodiments thereof are not limited thereto.

[0040] The body 100 may include two or more types of magnetic materials dispersed in the resin. Here, the different types of magnetic materials may mean that the magnetic materials dispersed in the resin can be distinguished from each other by at least one of average diameter, composition, crystallinity, and shape.

[0041] The resin may include epoxy resin, polyimide, liquid crystal polymer, etc., alone or in combination, but the embodiment is not limited thereto.

[0042] Reference Figure 2 and Figure 3 , the body 100 may include a core 110 passing through the support member 200 and the coil 300. The core 110 may be formed by filling through holes in the support member 200 and the coil 300 with a magnetic composite sheet, but the embodiment is not limited thereto.

[0043] Reference Figure 1 , Figure 2 and Figure 4 , the coil component 1000 according to the embodiment may include grooves G1 and G2 provided on the first surface 101 of the body 100 .

[0044] The grooves G1 and G2 in the embodiment may be configured to improve insulation reliability of the coil component 1000 by ensuring a creepage distance between the first heat dissipation part 610 and the external electrodes 410 and 420 .

[0045] Specifically, the first and second external electrodes 410 and 420 may be spaced apart from each other on the first surface 101 of the body 100 , and the first heat dissipation part 610 may be disposed in a region between the first and second external electrodes 410 and 420 .

[0046] On the first surface 101 of the body 100 , the first groove G1 may be disposed in a region between the first heat dissipation part 610 and the first external electrode 410 , and the second groove G2 may be disposed in a region between the first heat dissipation part 610 and the second external electrode 420 .

[0047] In the embodiment, a structure including both the first groove G1 and the second groove G2 is illustrated, but the structure is not limited thereto and may include only one of the first groove G1 and the second groove G2 .

[0048] Reference Figure 2 Referring to the enlarged view a and the enlarged view b in the embodiment, in the embodiment, the creepage distance CR1 between the first heat dissipation portion 610 and the external electrodes 410 and 420 may be greater than the spacing CL1 between the first heat dissipation portion 610 and the external electrodes 410 and 420 .

[0049] This is due to the structure in which the grooves G1 and G2 are provided on the first surface 101 of the body 100. When the grooves G1 and G2 are not provided, the creepage distance between the first heat dissipation part 610 and the external electrodes 410 and 420 may have the same value as the interval CL1 therebetween.

[0050] Based on the coil component 1000 according to the embodiment, compared with an example without the grooves G1 and G2 , even if the interval CL1 is the same, a larger creepage distance CR1 is formed, so that the length of the current leakage path along the surface can be increased and the insulation reliability can be improved.

[0051] Reference Figure 1 and Figure 2 , the grooves G1 and G2 may be disposed on the first surface 101 of the body 100 , and may be recessed inwardly into the body 100 .

[0052] In addition, each of the grooves G1 and G2 may be disposed parallel to the third direction. That is, the first groove G1 and the second groove G2 may be spaced apart from each other in the second direction and may each extend in a straight line to the fifth surface 105 and the sixth surface 106 of the body 100 .

[0053] In addition, the side surfaces of the grooves G1 and G2 may be inclined. That is, each of the grooves G1 and G2 may have a tapered shape having a cross-sectional area that increases from the inside to the outside of the body 100. For example, Figure 2 In the cross-sectional view shown in , the width of each of the grooves G1 and G2 may increase from the inside to the outside of the body 100 .

[0054] Due to the shapes of the grooves G1 and G2, when the first insulating layer 510 to be described later is disposed in the grooves G1 and G2, the first insulating layer 510 can be conformally disposed, and accordingly, a creepage distance CR1 along the surface of the first insulating layer 510 between the first heat dissipation portion 610 and the external electrodes 410 and 420 can be easily ensured.

[0055] However, the shapes of the grooves G1 and G2 in the embodiment are not limited to the above shapes, and side surfaces of the grooves G1 and G2 may have shapes perpendicular to the first surface 101 of the body 100 , and the grooves G1 and G2 may be formed as surfaces having an arch shape.

[0056] The grooves G1 and G2 may be provided by removing a portion of the first surface 101 of the body 100 using a cutting tip, or the body 100 including the grooves G1 and G2 may be formed using a mold. In this case, the depth and / or width of the grooves G1 and G2 may be adjusted to ensure that the coil component 1000 has a creepage distance required for insulation reliability.

[0057] Reference Figure 1 and Figure 2 The coil component 1000 according to the embodiment may include recesses R1 and R2 disposed in a region between a second heat dissipation portion 620 disposed on the second surface 102 of the body 100 and the external electrodes 410 and 420 .

[0058] The recesses R1 and R2 in the embodiment can be arranged in the corner area between the second surface 102 and the third surface 103 and the fourth surface 104 of the body 100, and the insulation reliability can be improved by setting a spacing area between the second heat dissipation portion 620 and the external electrodes 410 and 420, and the plating layer on the external electrodes 410 and 420 can be prevented from seeping out.

[0059] The recesses R1 and R2 may be provided in at least one of a corner region between the second surface 102 and the third surface 103 of the body 100 and a corner region between the second surface 102 and the fourth surface 104 of the body 100 .

[0060] Specifically, the first recess R1 may be provided in a corner region between the second surface 102 and the third surface 103 of the body 100, and may separate the second heat dissipation portion 620 and the first external electrode 410 from each other. The second recess R2 may be provided in a corner region between the second surface 102 and the fourth surface 104 of the body 100, and may separate the second heat dissipation portion 620 and the second external electrode 420 from each other.

[0061] In the embodiment, the structure including both the first recess R1 and the second recess R2 is illustrated, but the structure is not limited thereto and may include only one of the first recess R1 and the second recess R2 .

[0062] Reference Figure 2 As shown in the enlarged view c and the enlarged view d in the embodiment, the creepage distance CR2 between the second heat dissipation portion 620 and the external electrodes 410 and 420 may be greater than the spacing CL2 between the second heat dissipation portion 620 and the external electrodes 410 and 420.

[0063] If the second heat dissipation part 620 is disposed on the entire second surface 102 of the body 100 without the recesses R1 and R2 , it may be difficult to ensure spacing and creepage distances between the second heat dissipation part 620 and the external electrodes 410 and 420 , thereby possibly causing a risk of short circuit or current leakage along the surface.

[0064] In addition, compared with an example in which the coil component is directly connected to a heat sink included in a circuit board without a second heat dissipation portion, heat generated due to high voltage and high current can be removed more effectively. In addition, compared with an example without recesses R1 and R2, the spacing can be the same, but the creepage distance can be ensured by providing recesses R1 and R2, so that the length of the current leakage path along the surface can be increased, and the insulation reliability can be improved.

[0065] Reference Figure 1 and Figure 2 The recesses R1 and R2 may be disposed in corner regions between the second surface 102 of the body 100 and the third and fourth surfaces 103 and 104 , and may be recessed inwardly into the body 100 .

[0066] In addition, each of the recesses R1 and R2 may be disposed parallel to the third direction. That is, the first recess R1 and the second recess R2 may be spaced apart from each other in the second direction and may each extend to the fifth surface 105 and the sixth surface 106 of the body 100 .

[0067] In addition, the side surfaces of the recesses R1 and R2 may be inclined. That is, each of the recesses R1 and R2 may have a tapered shape having a cross-sectional area that increases from the inside to the outside of the body 100. For example, Figure 2 In the cross-sectional view shown in , the width of each of the recesses R1 and R2 increases from the inside to the outside of the body 100 .

[0068] Due to the shapes of the recesses R1 and R2, when the second insulating layer 520 to be described later is disposed in the recesses R1 and R2, the second insulating layer 520 can be conformally disposed, and accordingly, a creepage distance CR2 along the surface of the second insulating layer 520 between the second heat dissipation portion 620 and the external electrodes 410 and 420 can be easily ensured.

[0069] However, the shapes of the recesses R1 and R2 in the embodiment are not limited to the above shapes, and side surfaces of the recesses R1 and R2 may have shapes perpendicular to the second surface 102 of the body 100 , and the recesses R1 and R2 may be provided to have arc-shaped curved surfaces.

[0070] The recesses R1 and R2 may be provided by performing pre-cutting on one surface of the coil bar along a conceptual boundary line matching the third direction of each coil component among conceptual boundary lines that individualize each coil component at the coil bar level before each coil component is individualized. However, embodiments thereof are not limited thereto, and the body 100 including the recesses R1 and R2 may be formed by a mold.

[0071] In this case, the depth and / or width of the recesses R1 and R2 may be adjusted so that the coil component 1000 may be ensured to have a creepage distance required for insulation reliability.

[0072] The support member 200 may be disposed in the body 100 and may have one surface and another surface opposite to each other. Figure 1 In the direction in FIG. 2 , one surface of the support member 200 may correspond to an upper surface, and the other surface of the support member 200 may correspond to a lower surface.

[0073] The supporting member 200 may be a component that supports the coil 300. Figure 2 , the support member 200 may support the first coil part 311 and the first lead-out part 331 disposed on one surface and the second coil part 312 and the second lead-out part 332 disposed on the other surface.

[0074] The support member 200 may not be included in an embodiment, for example, when the coil 300 corresponds to a wound coil or has a coreless structure, the coil component 1000 may not include the support member 200 .

[0075] The support member 200 may be formed using a thermosetting insulating resin such as epoxy resin, a thermoplastic insulating resin such as polyimide, or an insulating material including a photosensitive insulating resin, or may be formed using an insulating material obtained by impregnating a reinforcing material such as glass fiber or an inorganic filler in the insulating resin. For example, the support member 200 may be formed using an insulating material such as a prepreg, an Ajinomoto build-up film (ABF), FR-4, a bismaleimide triazine (BT) film, and a photosensitive dielectric (PID) film, but embodiments thereof are not limited thereto.

[0076] As the inorganic filler, at least one selected from the group consisting of silicon dioxide (SiO2), aluminum oxide (Al2O3), silicon carbide (SiC), barium sulfate (BaSO4), talc, clay, mica powder, aluminum hydroxide (Al(OH)3), magnesium hydroxide (Mg(OH)2), calcium carbonate (CaCO3), magnesium carbonate (MgCO3), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO3), barium titanate (BaTiO3) and calcium zirconate (CaZrO3) can be used.

[0077] When the support member 200 is formed using an insulating material including a reinforcing material, the support member 200 can provide improved rigidity. When the support member 200 is formed using an insulating material not including glass fiber, the support member 200 can be made thicker by reducing the total thickness (representing the thickness of the support member 200 and the coil 300) of the support member 200. Figure 1The thickness of the coil component can be easily reduced by using the sum of the dimensions of the coil 300 and the support member 200 in the first direction. When the support member 200 is formed using an insulating material including a photosensitive insulating resin, the number of processes for forming the coil 300 can be reduced, which can be beneficial for reducing production costs, and a fine via 320 can be formed. The thickness of the support member 200 can be, for example, greater than or equal to 10 μm and less than or equal to 50 μm, but embodiments thereof are not limited thereto.

[0078] The coil 300 may be embedded in the body 100 and may exhibit characteristics of a coil component. For example, when the coil component 1000 according to the embodiment is used as a power inductor, the coil 300 may play a role in stabilizing power of an electronic device by storing an electric field as a magnetic field and maintaining an output voltage.

[0079] The coil 300 may include first and second coil parts 311 and 312 , a via 320 , and first and second lead-out parts 331 and 332 .

[0080] Reference Figure 2 , relative to Figure 2 In the direction of the support member 200, the first coil portion 311 and the first lead portion 331 may be disposed on one surface (upper surface) of the support member 200 opposite to the second surface 102 of the body 100. The second coil portion 312 and the second lead portion 332 may be disposed on the other surface (lower surface) of the support member 200 opposite to the first surface 101 of the body 100.

[0081] Reference Figure 1 and Figure 2 , the first coil portion 311 may be disposed on one surface of the support member 200, and may form at least one turn centered on the core 110, and the outermost turn may extend to contact and be connected to the first lead-out portion 331. The first coil portion 311 may have a planar spiral shape, but embodiments thereof are not limited thereto, and the first coil portion 311 may also have an angled shape.

[0082] The first lead-out portion 331 may be disposed on one surface of the support member 200 and may extend from the outermost turn of the first coil part 311 to the third surface 103 of the body 100. The first lead-out portion 331 may be exposed to the third surface 103 of the body 100 and may be connected to the first external electrode 410.

[0083] The second coil portion 312 may be disposed on the other surface of the support member 200, and may form at least one turn centered on the core 110, and the outermost turn may extend to contact and be connected to the second lead-out portion 332. The second coil portion 312 may have a planar spiral shape, but embodiments thereof are not limited thereto, and the second coil portion 312 may also have an angled shape.

[0084] The second lead-out portion 332 may be disposed on another surface of the support member 200 and may be disposed to extend from the outermost turn of the second coil part 312 to the fourth surface 104 of the body 100. The second lead-out portion 332 may be exposed to the fourth surface 104 of the body 100 and may be connected to the second external electrode 420.

[0085] Reference Figure 3 The via 320 may be a component that connects the first coil portion 311 and the second coil portion 312 disposed on both surfaces of the support member 200 to each other. Specifically, the via 320 may penetrate the support member 200 and may connect the ends of the innermost turns of the first coil portion 311 and the second coil portion 312 to each other.

[0086] Therefore, the signal input to the first external electrode 410 can be output to the second external electrode 420 through the first lead-out portion 331, the first coil portion 311, the via 320, the second coil portion 312, and the second lead-out portion 332. With this structure, each component of the coil 300 can be used as a single coil connected between the first external electrode 410 and the second external electrode 420.

[0087] At least one of the first coil portion 311 and the second coil portion 312, the via 320, and the first lead-out portion 331 and the second lead-out portion 332 may include one or more conductive layers. For example, when the first coil portion 311, the first lead-out portion 331, and the via 320 are formed on the upper surface of the support member 200 by plating, each of the first coil portion 311, the first lead-out portion 331, and the via 320 may include a first conductive layer provided by electroless plating and a second conductive layer provided on the first conductive layer.

[0088] The first conductive layer may be a seed layer for setting a second conductive layer on the support member 200 by electroplating. The second conductive layer set by electroplating may have a single-layer structure or a multi-layer structure. The second conductive layer having a multi-layer structure may be formed into a conformal film structure, in which one electroplated layer is covered by another electroplated layer set by electroplating. The seed layer of the first coil portion 311 and the seed layer of the first lead-out portion 331 may be integrally arranged and may not form a boundary therebetween, but embodiments thereof are not limited thereto. The electroplated layer of the first coil portion 311 and the electroplated layer of the first lead-out portion 331 may be integrally arranged so that no boundary may be set therebetween, but embodiments thereof are not limited thereto.

[0089] Each of the first and second coil portions 311 and 312, the via 320, the first and second lead portions 331 and 332 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or an alloy thereof, but embodiments thereof are not limited thereto.

[0090] Reference Figure 2 and Figure 3 , the coil component 1000 according to the embodiment may further include an insulating film IF in the body 100 .

[0091] The insulating film IF may insulate the coil parts 311 and 312 and the lead-out parts 331 and 332 from the body 100. The insulating film IF may include, for example, polyparaxylene, but embodiments thereof are not limited thereto. The insulating film IF may be provided using a method such as vapor deposition, but embodiments thereof are not limited thereto, and may be provided by laminating insulating films on both surfaces of the support member 200. In addition, the insulating film IF may have a structure including a portion of a plating resist provided on the coil 300 by electroplating, but embodiments thereof are not limited thereto.

[0092] Reference Figure 1 and Figure 2 , the first external electrode 410 and the second external electrode 420 may be spaced apart from each other on the first surface 101 of the body 100, and the first external electrode 410 may extend to the third surface 103 of the body 100 and may be connected to the first lead-out portion 331. In addition, the second external electrode 420 may extend to the fourth surface 104 of the body 100 and may be connected to the second lead-out portion 332.

[0093] The external electrodes 410 and 420 may be formed using a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Cr), titanium (Ti), or an alloy thereof, but embodiments thereof are not limited thereto.

[0094] The external electrodes 410 and 420 may be formed in a multi-layer structure. For example, the external electrodes 410 and 420 may include a first layer connected to the coil 300 and a second layer disposed on the first layer. The first layer may be a conductive resin layer or a copper (Cu) plated layer, the conductive resin layer including conductive particles and an insulating resin, the conductive particles including at least one of copper (Cu) and silver (Ag). In addition, the second layer may have a double-layer structure of a nickel (Ni) plated layer and a tin (Sn) plated layer.

[0095] In this case, the first layer of the external electrodes 410 and 420 may be provided by electroplating, vapor deposition such as sputtering, or by coating a conductive paste including conductive particles such as copper (Cu) and / or silver (Ag) and curing the conductive paste. The second layer of the external electrodes 410 and 420 may be provided by electroplating.

[0096] Reference Figures 1 to 3 , the coil component 1000 according to the embodiment may include a first insulating layer 510 disposed between the first heat dissipation part 610 and the body 100 .

[0097] The first insulating layer 510 may be a component disposed on the first surface 101 of the body 100 , and may insulate the surface of the body 100 .

[0098] Both ends of the first insulating layer 510 may be disposed to contact ends of the external electrodes 410 and 420 , respectively, and at least a portion of the first insulating layer 510 may be disposed along surfaces of the grooves G1 and G2 .

[0099] By extending at least a portion of the first insulating layer 510 to the surfaces of the grooves G1 and G2 , insulation reliability between the first heat dissipation part 610 and the external electrodes 410 and 420 may be improved.

[0100] In addition, the coil component 1000 according to the embodiment may include a second insulating layer 520 disposed between the second heat radiating part 620 and the body 100 .

[0101] The second insulating layer 520 may be a component disposed on the second surface 102 of the body 100 , and may insulate the surface of the body 100 .

[0102] Both ends of the second insulating layer 520 may be disposed to contact ends of the external electrodes 410 and 420 , respectively, and at least a portion of the second insulating layer 520 may be disposed along surfaces of the recessed portions R1 and R2 .

[0103] By extending at least a portion of the second insulating layer 520 to the surfaces of the recessed portions R1 and R2 , insulation reliability between the second heat dissipation portion 620 and the external electrodes 410 and 420 may be improved.

[0104] Although not shown in the drawings, an insulating layer for surface insulation may also be provided on Figure 1 On the fifth surface 105 and the sixth surface 106 of the main body 100 shown in FIG.

[0105] For example, the insulating layers 510 and 520 may be provided by applying an insulating material including an insulating resin to the surface of the body 100 and curing it. In this case, the insulating layers 510 and 520 may include at least one of a thermoplastic resin (such as polystyrene resin, vinyl acetate resin, polyester resin, polyethylene resin, polypropylene resin, polyamide resin, rubber resin, and acrylic resin), a thermosetting resin (such as phenolic resin, epoxy resin, polyurethane resin, melamine resin, alkyd resin, etc.), and a photosensitive resin.

[0106] Reference Figures 1 to 4 The coil component 1000 according to the embodiment may include a first heat dissipation portion 610 disposed in a region between the first groove G1 and the second groove G2 on the first surface 101 of the body 100 .

[0107] In addition, the coil component 1000 according to the embodiment may further include a second heat dissipation portion 620 disposed in a region between the first recess R1 and the second recess R2 on the second surface 102 of the body 100 .

[0108] When the coil component 1000 according to the embodiment is mounted on a circuit board and powered on, the first heat dissipation portion 610 and the second heat dissipation portion 620 may play a role in dissipating heat generated in the coil component 1000 to the outside. The first heat dissipation portion 610 and the second heat dissipation portion 620 may include at least one of Cu, Ni, SiO2, SiC, SiN, carbon polymer, and resin added with thermal conductive filler.

[0109] Figure 5 is with Figure 2 Correspondingly, the drawings show a coil component according to the second embodiment.

[0110] If Figure 5 and Figure 2 In comparison, the coil component 2000 according to the second embodiment may be different from the coil component 1000 according to the first embodiment in that only the recesses R1 and R2 and the second heat dissipation portion 620 are provided, while the groove and the first heat dissipation portion are not provided.

[0111] Therefore, when describing the second embodiment, only components located at the first surface 101 of the body 100 that are different from the first embodiment will be described, and the description of other components in the first embodiment may be applied to other components in the second embodiment.

[0112] Reference Figure 5 , in the coil component 2000 according to the embodiment, the first heat dissipation portion may not be provided on the first surface 101 of the body 100 , and the groove may not exist.

[0113] The first insulating layer 510 may be disposed on the first surface 101 of the body 100 in a region between the first and second external electrodes 410 and 420 .

[0114] The coil component 2000 according to the embodiment may be advantageous in miniaturizing the component by excluding the first heat dissipation portion and the groove, and may ensure a space for disposing a magnetic material within a limited size, so that an effect of improving inductance due to an increase in effective volume may be obtained.

[0115] In addition, when the coil component 2000 is mounted on a circuit board, the risk of a short circuit between the external electrodes 410 and 420 and the first heat dissipation part 610 by solder may be prevented compared to the coil component 1000 according to the first embodiment.

[0116] Figure 6 is with Figure 5 Correspondingly, a diagram of a coil component 2000 ′ according to a modified example of the second embodiment is shown.

[0117] If Figure 6 and Figure 5 In comparison, in the coil component 2000' according to the modified example of the second embodiment, the second insulating layer 520 may fill (e.g., may completely fill or may partially fill) the recesses R1 and R2, and accordingly, the spacing CL3 and the creepage distance CR3 between the external electrodes 410 and 420 and the second heat dissipation portion 620 may be different from those in the second embodiment.

[0118] Therefore, when describing the variant example of the second embodiment, the arrangement relationship between the second insulating layer 520 and the recesses R1 and R2 and the changes in the spacing CL3 and the creepage distance CR3 between the external electrodes 410 and 420 and the second heat dissipation portion 620 that are different from those in the second embodiment will be described, and the description of other components in the second embodiment can be applied to other components in the variant example of the second embodiment.

[0119] Reference Figure 6 , the second insulating layer 520 in the modified example of the second embodiment may be provided to fill the first recess R1 and the second recess R2.

[0120] A side surface of the second insulating layer 520 filling the recesses R1 and R2 may be substantially coplanar with the third surface 103 or the fourth surface 104 of the body 100 .

[0121] In other words, a side surface of the second insulating layer 520 filling the first recess R1 may be disposed substantially coplanar with the third surface 103 of the body 100 , and a side surface of the second insulating layer 520 filling the second recess R2 may be disposed substantially coplanar with the fourth surface 104 of the body 100 .

[0122] Here, a configuration in which components are substantially coplanar with each other may mean that the components may share substantially the same planar surface, including process errors.

[0123] By filling the corner area of ​​the body 100 that is recessed due to the setting of the recesses R1 and R2, the appearance of the coil component 2000' can be improved, and as the thickness of the second insulating layer 520 set in the recesses R1 and R2 increases, the insulation reliability between the second heat dissipation part 620 and the external electrodes 410 and 420 can also be improved.

[0124] In particular, refer to Figure 6 As shown in the enlarged view e and the enlarged view f, compared with the second embodiment, by providing the second insulating layer 520 filling the recesses R1 and R2, the creepage distance CR3 and the spacing CL3 between the second heat dissipating portion 620 and the external electrodes 410 and 420 can also be increased.

[0125] Accordingly, in the coil component 2000 ′ according to the modified example of the second embodiment, the second insulating layer 520 provided to fill the recesses R1 and R2 can improve the effect of preventing the risk of short circuit or current leakage between the second heat dissipation part 620 and the external electrodes 410 and 420 .

[0126] Figure 7 is with Figure 2 Correspondingly, the drawings show a coil component according to the third embodiment.

[0127] If Figure 7 and Figure 2 In comparison, the coil component 3000 according to the third embodiment may be different from the coil component 1000 according to the first embodiment in that only the grooves G1 and G2 and the first heat dissipation portion 610 are provided, and the recessed portion and the second heat dissipation portion are not provided.

[0128] Therefore, when describing the embodiment, only components located at the second surface 102 of the body 100 that are different from the first embodiment will be described, and the description of other components in the first embodiment can be applied to other components in the third embodiment.

[0129] Reference Figure 7 , in the coil component 3000 according to the embodiment, the second heat dissipation portion may not be provided on the second surface 102 of the body 100 , and the recess may not be provided.

[0130] The second insulating layer 520 may be disposed on the second surface 102 of the body 100 and in a region between the first and second external electrodes 410 and 420 .

[0131] The coil component 3000 according to the embodiment may be advantageous in terms of component miniaturization by not including a second heat dissipation portion and a recessed portion, and may ensure a space for disposing a magnetic material within a limited size, thereby obtaining an effect of improving inductance due to an increase in effective volume.

[0132] In addition, compared with the coil component 1000 according to the first embodiment, the magnetic flux transition that occurs when the second heat dissipation portion as a conductor is provided on the second surface 102 of the body 100 can be prevented.

[0133] Figure 8 is with Figure 2 Correspondingly, a view of a coil component 4000 according to a fourth embodiment is shown.

[0134] If Figure 8 and Figure 2 In comparison, the coil component 4000 according to the fourth embodiment may be different from the coil component 1000 according to the first embodiment in that the coil component 4000 may include a high magnetic permeability portion 120 in an upper region of the body 100 .

[0135] Therefore, when describing the fourth embodiment, only the high magnetic permeability portion 120 in the upper region of the body 100 that is different from the first embodiment will be described, and the description of other components in the first embodiment may be applied to other components in the fourth embodiment.

[0136] Reference Figure 8 , the body 100 in the fourth embodiment may include a high magnetic permeability portion 120 disposed in a region adjacent to the second heat dissipation portion 620 .

[0137] When the second heat dissipation portion 620 is provided as a conductor, the high magnetic permeability portion 120 may be used to prevent a decrease in inductance characteristics caused by the transfer of magnetic flux around the coil 300 .

[0138] The high magnetic permeability portion 120 may include a material different from that of other regions of the body 100 , and may include a material having a higher magnetic permeability than that of other regions of the body 100 .

[0139] In addition, the magnetic permeability of the high magnetic permeability portion 120 may be 5% or more higher than that of other regions of the body 100 , but embodiments thereof are not limited thereto.

[0140] Reference Figure 8 , the high permeability portion 120 may have an interface with other regions of the body 100. However, the coil component 4000 according to the fourth embodiment is not limited thereto, and according to a method of disposing the high permeability portion 120, the component may be integrally disposed without an interface between the high permeability portion 120 and other regions of the body 100.

[0141] In addition, at least a portion of the high magnetic permeability portion 120 may be covered by the second insulating layer 520 .

[0142] According to the aforementioned embodiments, a coil component having an excellent heat dissipation effect and ensuring insulation reliability between an external electrode and a heat dissipation portion when mounted on a circuit board can be provided.

[0143] According to another aspect, by forming the upper portion of the main body as the high magnetic permeability portion, magnetic flux loss due to the heat sink provided on the upper surface of the main body can be reduced.

[0144] While embodiments have been shown and described above, it will be readily apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: A body including a first surface and a second surface opposite to each other in a first direction, and a third surface and a fourth surface connected to the first surface and the second surface and opposite to each other in the second direction; a coil disposed in the body; an external electrode disposed on the body and connected to the coil; as well as A first heat dissipation portion is disposed on the first surface, Wherein, the main body includes a groove arranged in a region between the first heat dissipation portion and the external electrode.

2. The coil assembly according to claim 1, wherein: The groove is disposed on the first surface and is recessed inwardly into the body.

3. The coil assembly according to claim 1, wherein: The groove is disposed parallel to a third direction, and the third direction is perpendicular to each of the first direction and the second direction.

4. The coil assembly according to claim 1, wherein: The side surfaces of the groove are inclined.

5. The coil assembly according to claim 1, wherein: The first insulating layer is disposed between the first heat dissipation portion and the body.

6. The coil assembly according to claim 5, wherein: At least a portion of the first insulating layer is disposed along a surface of the groove.

7. The coil assembly according to claim 1, wherein: The first heat dissipation portion includes at least one of Cu, Ni, SiO2, SiC, SiN, a carbon polymer, and a resin added with a thermally conductive filler.

8. The coil assembly according to claim 1, further comprising: A second heat dissipation portion is disposed on the second surface, Wherein, the main body further includes a recessed portion arranged in a region between the second heat dissipating portion and the external electrode.

9. The coil assembly according to claim 8, wherein: The recess is provided in at least one of a corner region between the second surface and the third surface and a corner region between the second surface and the fourth surface, and is recessed inwardly into the body.

10. The coil assembly according to claim 8, wherein: The recess is disposed parallel to a third direction that is perpendicular to each of the first direction and the second direction.

11. The coil assembly according to claim 8, wherein: The side surface of the recess is inclined.

12. The coil assembly according to claim 8, wherein: The second insulating layer is disposed between the second heat dissipation portion and the body.

13. The coil assembly according to claim 12, wherein: At least a portion of the second insulating layer is disposed along a surface of the recess.

14. The coil assembly according to claim 13, wherein: The second insulating layer is provided to fill the recess.

15. The coil assembly according to claim 8, wherein: The second heat dissipation portion includes at least one of Cu, Ni, SiO2, SiC, SiN, a carbon polymer, and a resin to which a thermal conductive filler is added.

16. The coil assembly according to claim 12, wherein: The body further includes a high magnetic permeability portion provided in a region adjacent to the second heat dissipation portion.

17. The coil assembly according to claim 16, wherein: The high magnetic permeability portion includes a material having a higher magnetic permeability than other regions of the body.

18. The coil assembly according to claim 16, wherein: The high magnetic permeability portion has a magnetic permeability at least 5% higher than that of other regions of the body.

19. The coil assembly according to claim 16, wherein: An interface is provided between the high magnetic permeability portion and other regions of the body.

20. The coil assembly according to claim 16, wherein: At least a portion of the high magnetic permeability portion is covered by the second insulating layer.

21. The coil assembly according to claim 1, wherein: The external electrodes include first and second external electrodes respectively disposed on the third and fourth surfaces of the body, and a second insulating layer is disposed on the second surface of the body in a region between the first and second external electrodes.

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