CN-122000178-A - Coil assembly

Abstract

The present disclosure provides a coil assembly. The coil assembly includes a body having first and second surfaces opposite to each other in a first direction and a plurality of side surfaces connecting the first and second surfaces. The body includes a magnetic material and houses a coil. The first and second external electrodes are spaced apart from each other on the body in the second direction and are connected to respective ends of the coil. The main body further includes a molding portion in which the coil is disposed, and a covering portion contacting the molding portion. A relief pattern protrudes from a surface of the cover facing the molding. At least a portion of the relief pattern overlaps the coil when viewed along the first direction. The structure is designed to improve reliability by inhibiting stress propagation and crack formation during manufacturing or operation.

Inventors

• JIN TAIXIAN
• Pu Zhuheng
• QUAN CHUNGUANG
• JIN DAIZHEN
• LI DONGZHEN

Assignees

• 三星电机株式会社

Dates

Publication Date

20260508

Application Date

20251023

Priority Date

20241104

Claims (16)

1. 1. A coil assembly, comprising: A main body including first and second surfaces opposite to each other in a first direction and a plurality of side surfaces connecting the first and second surfaces, and including a magnetic material; a coil disposed in the main body, and First and second external electrodes provided on the main body to be spaced apart from each other in a second direction and connected to both ends of the coil, respectively, Wherein the main body includes a molded portion in which the coil is provided, and a cover portion including one surface in contact with the molded portion, from which a relief pattern protrudes, and at least a portion of which overlaps the coil when viewed in the first direction.
2. 2. The coil assembly of claim 1, wherein the relief pattern has a radial shape from a center of the one surface of the cover to an outside when viewed along the first direction.
3. 3. The coil assembly of claim 1, wherein the molding includes a core extending through the coil.
4. 4. A coil assembly according to claim 3, wherein the relief pattern overlaps the core when viewed along the first direction.
5. 5. The coil assembly of claim 1, further comprising: an insulating film covering the coil, Wherein the relief pattern is in contact with the insulating film.
6. 6. The coil assembly of claim 1, wherein the relief pattern does not extend through the coil.
7. 7. The coil assembly of claim 1, wherein the cover further comprises another surface opposite to the one surface in the first direction and a plurality of side surfaces connecting the one surface and the another surface, the another surface of the cover forming the second surface of the main body, and the plurality of side surfaces of the cover forming the plurality of side surfaces of the main body.
8. 8. The coil assembly of claim 1 wherein, The cover comprises first magnetic metal particles, The molded part includes second magnetic metal particles, and The first magnetic metal particles included in the covering portion and the second magnetic metal particles included in the molding portion have different particle size distributions.
9. 9. The coil assembly of claim 1, wherein both ends of the coil extend to both sides of the main body facing each other in the second direction.
10. 10. The coil assembly of claim 1 wherein, The molding part includes one surface forming the first surface of the main body, another surface facing the one surface in the first direction and contacting the covering part, and a plurality of side surfaces connecting the one surface and the other surface, and the covering part covers the plurality of side surfaces of the molding part.
11. 11. The coil assembly of claim 1, wherein the relief pattern is spaced apart from the plurality of side surfaces of the body.
12. 12. The coil assembly of claim 1, wherein both ends of the coil extend to the first surface of the body.
13. 13. A coil assembly, comprising: A main body including first and second surfaces opposite to each other in a first direction and a plurality of side surfaces connecting the first and second surfaces, and including a magnetic material; A coil disposed in the body and forming at least one turn, and First and second external electrodes provided on the main body to be spaced apart from each other in a second direction and connected to both ends of the coil, Wherein the main body includes a molded portion in which the coil is disposed, and a cover portion including one surface in contact with the molded portion, from which a relief pattern protrudes, and which is spaced apart from the plurality of side surfaces of the main body when viewed in the first direction.
14. 14. The coil assembly of claim 13, wherein the molding part includes one surface forming the first surface of the main body, another surface facing the one surface in the first direction and contacting the covering part, and a plurality of side surfaces connecting the one surface and the other surface, and the covering part covers the plurality of side surfaces of the molding part.
15. 15. The coil assembly of claim 13, wherein both ends of the coil extend to the first surface of the body.
16. 16. The coil assembly of claim 13, wherein the relief pattern comprises a beam-like relief structure disposed on the one surface of the cover.

Description

Coil assembly The present application claims the benefit of priority of korean patent application No. 10-2024-0154648 filed at the korean intellectual property agency on month 11 and 4 of 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field The present disclosure relates to a coil assembly. Background Inductors (coil assemblies) are representative passive electronic components used in electronic devices with resistors and capacitors. Inductors applied to PC related components such as DDR 5 have been developed toward high efficiency and large size due to characteristics of components using high current. For a large-sized inductor, the main body thereof may be formed using a single mold and may be divided into a cover portion and a remaining portion (molded portion) in which the coil is disposed. Cracks may occur between the cover part and the remainder part due to differences in the applied material and pressing conditions. Disclosure of Invention An aspect of the present disclosure is to provide a coil assembly having improved reliability by controlling crack occurrence in a magnetic body. According to an aspect of the present disclosure, a coil assembly includes a body including first and second surfaces opposite to each other in a first direction and a plurality of side surfaces connecting the first and second surfaces, and the body includes a magnetic material, a coil disposed within the body, and first and second external electrodes disposed on the body to be spaced apart from each other in the second direction and connected to both ends of the coil, respectively, wherein the body includes a molding portion in which the coil is disposed, and a cover portion including one surface in contact with the molding portion, a relief pattern protruding from the one surface of the cover portion, and at least a portion of the relief pattern overlaps the coil when viewed in the first direction. According to another aspect of the present disclosure, a coil assembly includes a body including first and second surfaces opposite to each other in a first direction and a plurality of side surfaces connecting the first and second surfaces, and the body includes a magnetic material, a coil disposed within the body and forming at least one turn, and first and second external electrodes disposed on the body to be spaced apart from each other in the second direction and connected to both ends of the coil, wherein the body includes a molding portion in which the coil is disposed and a cover portion including one surface in contact with the molding portion, a relief pattern protruding from the one surface of the cover portion, and the relief pattern is spaced apart from the plurality of side surfaces of the body when viewed along the first direction. Drawings The above and other aspects, features and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which: Fig. 1 is a perspective view schematically illustrating a coil assembly according to an embodiment of the present disclosure; FIG. 2 is a cross-sectional view taken along line I-I' of FIG. 1; Fig. 3 is a view seen along the X direction of fig. 1; Fig. 4 is an enlarged view of portions a and B of fig. 2; Fig. 5 is an enlarged view corresponding to the a and B portions of fig. 2 as a modified example; fig. 6A to 6E are diagrams of the covering portion as viewed along the X direction of fig. 1; fig. 7A to 7E are diagrams of the covering portion and the coil as viewed along the X direction of fig. 1; fig. 8 is a perspective view schematically illustrating a coil assembly according to another embodiment of the present disclosure; FIG. 9 is a cross-sectional view taken along line II-II' of FIG. 8, and Fig. 10 is a view as seen along the X direction of fig. 8. Detailed Description The terminology used herein to describe embodiments of the present disclosure is not intended to limit the scope of the present disclosure. "A" and "an" are singular in that they have a single referent, however, the use of the singular in this document does not exclude the presence of more than one referent. In other words, the number of elements of the disclosure referred to in the singular may be one or more unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," "including" and/or "having," when used herein, specify the presence of stated features, amounts, steps, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, amounts, steps, operations, elements, components, and/or groups thereof. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless the context clearly differs, the expression