CN220439379U

CN220439379U - Coil assembly

Info

Publication number: CN220439379U
Application number: CN202321869717.0U
Authority: CN
Inventors: 贺环宇; 李彪; 黄美华
Original assignee: Avary Holding Shenzhen Co Ltd; Qing Ding Precision Electronics Huaian Co Ltd
Current assignee: Avary Holding Shenzhen Co Ltd; Qing Ding Precision Electronics Huaian Co Ltd
Priority date: 2023-07-14
Filing date: 2023-07-14
Publication date: 2024-02-02
Anticipated expiration: 2033-07-14

Abstract

The application provides a coil assembly, including substrate layer, circuit layer and insulating layer. The circuit layer includes a first lead, a second lead, and a spiral coil. The helical coil has a first end and a second end, and further includes a loop. The annular part comprises a first part, and a first groove is formed in the surface of the first part, facing the substrate layer. The first lead is electrically connected to the second end. The second lead includes a first lead portion and a second lead portion connected. The first lead part is electrically connected to the first end part and penetrates through the first groove. The first lead part comprises a first surface which is arranged away from the substrate layer and two oppositely arranged second surfaces which are connected between the first surface and the substrate layer. The second lead portion and the first lead are both located outside the spiral coil. The insulating layer is arranged in the gap between the first part and the inner wall of the first groove, connected between the first part and the first surface and also connected between the first part and each second surface. The coil assembly provided by the application facilitates thickness reduction.

Description

Coil assembly

Technical Field

The present application relates to the field of wireless charging, and in particular to a coil assembly.

Background

The preparation of existing coil assemblies generally includes: the method comprises the steps of forming an opening in a double-sided copper-clad substrate (comprising a substrate layer and conductive layers arranged on two opposite surfaces of the substrate layer), forming a plating layer in the opening and on each conductive layer by electroplating, selectively etching one conductive layer and one plating layer to obtain a coil, and selectively etching the other circuit layer and the other plating layer to obtain a first lead and a second lead. Since the leads and the coil are provided on opposite sides of the substrate layer, respectively, plating must be introduced to conduct the leads and the coil, and copper plating on each conductive layer results in an increase in the thickness of the coil assembly.

Disclosure of Invention

In view of this, the present application provides a coil assembly that facilitates reduced thickness.

The application provides a coil assembly, which comprises a substrate layer and a circuit layer which are stacked along a first direction. The coil assembly further includes an insulating layer. The circuit layer includes a first lead, a second lead, and a spiral coil. The helical coil has a first end and a second end. The spiral coil comprises an annular portion, the annular portion comprises a first portion, and a first groove is formed in the surface, facing the substrate layer, of the first portion. The first lead is electrically connected to the second end. The second lead comprises a first lead part and a second lead part which are connected, and the first lead part is electrically connected to the first end part and penetrates through the first groove. The first lead part comprises a first surface which is arranged away from the substrate layer and two oppositely arranged second surfaces which are connected between the first surface and the substrate layer. The second lead portion and the first lead are both located outside the spiral coil. The insulating layer is arranged in a gap between the first part and the inner wall of the first groove. The insulating layer is connected between the first portion and the first face, and the insulating layer is also connected between the first portion and each of the second faces.

In some possible embodiments, the spiral coil includes at least two connected annular portions, the first portion of each annular portion is provided with one first groove, and the first lead portion passes through each first groove.

In some possible embodiments, the first portion includes two first end surfaces parallel to a second direction and two second end surfaces parallel to a third direction, the first direction and the second direction are perpendicular to each other, the first lead portion passes through the two first end surfaces along the second direction, the two second end surfaces are located on opposite sides of the first lead portion in the third direction, an included angle between the second end surfaces and the second direction is an acute angle, and the two first end surfaces and the two second end surfaces are enclosed to form a parallelogram when viewed along the first direction.

In some possible embodiments, the annular portion further includes a second portion electrically connected to one of the first end surfaces and a third portion electrically connected to the other of the first end surfaces, the third portion and the second portion of two adjacent annular portions are electrically connected, the first lead is electrically connected to the second portion of the outermost annular portion, and an area of a cross section of each of the second portion and the third portion along a direction parallel to the first direction is equal to an area of a cross section of the first lead portion along a direction parallel to the third direction.

In some possible implementations, the cross-section of each of the second and third portions along a direction parallel to the first direction is also equal to the area of the cross-section of the first portion along a direction parallel to the second direction.

In some possible embodiments, at least two of the first grooves and the first end portion are aligned in a second direction perpendicular to the first direction, the first lead portion extending from the first end portion in the second direction.

In some possible embodiments, at least two of the annular portions are arranged equidistant between the first portions along the second direction.

In some possible embodiments, the second portions of at least two of the annular portions are arranged equidistant between them, and the third portions of at least two of the annular portions are arranged equidistant between them.

In some possible embodiments, the first end is provided with a second groove, and the first face and one of the second faces are both fixed in the second groove.

In some possible embodiments, the second lead portion and the first lead are parallel to each other.

In this application, first portion is equipped with first recess, and electric connection passes first recess in the second lead wire of helical coil's first tip for the second lead wire can switch on first end portion outside helical coil, and helical coil passes through first lead wire and second lead wire 22 and battery electric connection of being convenient for. That is, the second lead can be accommodated in the first groove, so that the stacked thickness of the spiral coil and the second lead can be reduced. In addition, in the present application, the spiral coil, the first lead, and the second lead are all located on the same side of the base material layer. Thus, the coil assembly of the present application does not require additional plating to conduct the leads and coil. Thus, the coil assembly provided herein may have a smaller thickness.

Drawings

Fig. 1 is a schematic structural diagram of a coil assembly according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of the coil assembly of FIG. 1 taken along line II-II;

FIG. 3 is a cross-sectional view of the coil assembly shown in FIG. 1 taken along line III-III;

fig. 4 is a cross-sectional view of the coil assembly shown in fig. 1 taken along line iv-iv.

Description of the main reference signs

Coil assembly 100 substrate layer 10

First lead 21 of circuit layer 20

Second lead 22 first lead portion 221

First side 2211 and second side 2212

Second lead portion 222 spiral coil 23

First portion 231 of annular portion 230

First end surface 2311 and second end surface 2312

Second portion 232 third portion 233

First end 201 second end 202

Second groove 203 first groove 204

First direction X of insulating layer 30

Second direction Y third direction Z

Areas S1, S2, S3 gap 205

The following detailed description will further illustrate the application in conjunction with the above-described figures.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Referring to fig. 1, the present application provides a coil assembly 100. The coil assembly 100 includes a base layer 10 and a wiring layer 20 stacked in a first direction X. The coil assembly 100 also includes an insulating layer 30. The material of the substrate layer 10 may be one of polyimide, liquid crystal polymer, epoxy resin, or polyethylene terephthalate, for example. Illustratively, the material of the wiring layer 20 may be one of copper or a copper alloy (e.g., a tin-copper alloy). Illustratively, the material of the insulating layer 30 may be one of epoxy glue or polyethylene glue. The wiring layer 20 and the insulating layer 30 may be printed layer by a laser-fused deposited 3D printing technique. The raw material for forming the wiring layer 20 by 3D printing may be a mixture of nanoparticle solder (e.g., soldering powder) and metal powder (e.g., copper powder).

The wiring layer 20 includes a first lead 21, a second lead 22, and a spiral coil 23. The helical coil 23 has a first end 201 and a second end 202. The first end 201 is electrically connected to the second lead 22, and the second end 202 is electrically connected to the first lead 21. The first end 201 may be located within the inner race of the helical coil 23 and the second end 202 may be located outside of the helical coil 23. The spiral coil 23 may include one or at least two annular portions 230. In this embodiment, the spiral coil 23 includes at least two connected annular portions 230 (three annular portions 230 are shown in fig. 1). Each annular portion 230 includes a first portion 231 located between the first end 201 and the second end 202. The first portion 231 is recessed toward the surface of the substrate layer 10 to form a first recess 204. In this embodiment, the first portion 231 of each annular portion 230 is provided with a first recess 204. Thus, each first portion 231 is conformal to form at least two first grooves 204. The second lead 22 includes a first lead portion 221 and a second lead portion 222 connected. The first lead portion 221 is electrically connected to the first end 201 and passes through each first groove 204. The first lead portion 221 includes a first face 2211 disposed away from the substrate layer 10, and two second faces 2212 connected between the first face 2211 and the substrate layer 10. The two second faces 2212 are disposed opposite. Both the second side 2212 and the first side 2211 pass through the first recess 204. The second lead portion 222 and the first lead 21 are both located outside the spiral coil 23. Referring to fig. 1 and 2, a gap 205 is formed between the first lead portion 221 and the inner wall of the first groove 204, and an insulating layer 30 is provided in each gap 205. The insulating layer 30 is connected between the first portion 231 and the first face 2211. The insulating layer 30 is also connected between the first portion 231 and each of the second faces 2212.

The coil assembly 100 provided herein may be disposed within an electronic device (e.g., a cell phone) and electrically connected to a built-in battery of the electronic device. At this time, the coil assembly 100 may be used as a receiving end of the electromagnetic induction type wireless charging technology. The coil assembly 100 may also be disposed within a wireless charger and electrically connected to a power source. At this time, the coil assembly 100 may serve as a transmitting end of the electromagnetic induction type wireless charging technology. The principle of the electromagnetic induction type wireless charging technology is as follows: the current of the power supply passes through the coil structure of the transmitting end, so that the coil structure of the transmitting end generates a magnetic field. When the coil structure of the receiving end which is not electrified is placed in the magnetic field range, a magnetic induction current is generated on the coil structure of the receiving end. The magnetically induced current may be stored in a battery that is electrically connected to the coil structure of the receiving end. In this embodiment, the coil assembly 100 is disposed within an electronic device in use.

In this application, the first portion 231 is provided with a first groove 204, and the second lead 22 electrically connected to the first end 201 of the spiral coil 23 passes through the first groove 204, so that the second lead 22 can conduct the first end 201 to the outside of the spiral coil 23, and the spiral coil 23 is electrically connected with the battery through the first lead 21 and the second lead 22. That is, the second lead 22 can be accommodated in the first groove 204, so that the stacked thickness of the spiral coil 23 and the second lead 22 can be reduced. In addition, in the present application, the spiral coil 23, the first lead 21, and the second lead 22 are all located on the same side of the base material layer 10. Thus, the coil assembly 100 of the present application does not require additional plating to conduct the leads and coil. Thus, the coil assembly 100 provided herein may have a smaller thickness.

In some embodiments, with continued reference to fig. 1, the helical coil 23 is a square-like helical structure, as viewed along the first direction X. The square-like spiral structure has a larger cross section than the triangular spiral structure of equal length or the circular spiral structure of equal diameter, thereby facilitating the improvement of the magnetic flux of the spiral coil 23. Thus, the shape of the spiral coil 23 is set to facilitate the improvement of the magnetic field strength of the spiral coil 23.

In some embodiments, with continued reference to fig. 1, the first end 201 is provided with a second groove 203. The first surface 2211 and a second surface 2212 are fixed in the second groove 203 to electrically connect the first end 201 and the second lead 22. The second groove 203 is provided to enable the second lead 22 to be riveted to the first end 201, thereby improving the connection stability of the second lead 22 and the spiral coil 23.

In some embodiments, with continued reference to fig. 1, the at least two first grooves 204 and the first end 201 are aligned along a second direction Y perpendicular to the first direction X. The first lead portion 221 extends from the first end portion 201 in the second direction Y. The arrangement of the first grooves 204 is beneficial to simplifying the structure of the circuit layer 20.

In some embodiments, with continued reference to fig. 1, the second lead portion 222 is parallel to the first lead 21. The placement of the second lead portion 222 and the first lead 21 facilitates connection of the first lead 21 and the second lead 22 to a battery within the electronic device.

In some embodiments, with continued reference to fig. 1, the first portion 231 includes two first end surfaces 2311 that are parallel in the second direction Y and two second end surfaces 2312 that are parallel in the third direction Z. The third direction Z is perpendicular to the first direction X and the second direction Y. The first lead portion 221 passes through the two first end surfaces 2311 in the second direction Y. The two second end surfaces 2312 are located on opposite sides of the first lead portion 221 in the third direction Z, respectively. The angle between the second end surface 2312 and the second direction Y is an acute angle, for example, may be 45 degrees. It is understood that both the first end surface 2311 and the second end surface 2312 are connected to the substrate layer 10. The two first end surfaces 2311 and the two second end surfaces 2312 are enclosed to form a parallelogram as viewed in the first direction X. The shape of the first portions 231 is arranged to facilitate adjustment of the line spacing between the first portions 231 of the different annular portions 230.

In some embodiments, with continued reference to fig. 1, the first portions 231 of the at least two annular portions 230 are equally spaced along the second direction Y.

In some embodiments, with continued reference to fig. 1, the annular portion 230 further includes a second portion 232 and a third portion 233. The second portion 232 is electrically connected to a first end surface 2311. The third portion 233 is electrically connected to another first end surface 2311. The third portions 233 and the second portions 232 of the adjacent two annular portions 230 are electrically connected. The first lead 21 is electrically connected to the second portion 232 of the outermost ring portion 230. Referring to fig. 2 to 4, an area S3 (refer to fig. 4) of each of the second portion 232 and the third portion 233 along a cross section parallel to the first direction X is equal to an area S1 (refer to fig. 2) of the first lead portion 221 along a cross section parallel to the third direction Z. Optionally, the area S3 is also equal to the area S2 of the cross section of the first portion 231 along the direction parallel to the second direction Y (refer to fig. 3). The arrangement of the cross section of the ring-shaped portion 230 and the cross section of the first lead portion 221 are advantageous for improving the magnetic induction intensity of the coil assembly 100, thereby improving the magnetic field intensity of the coil assembly 100.

In some embodiments, referring back to fig. 1, the second portions 232 of the at least two annular portions 230 are equally spaced apart. The third portions 233 of the at least two ring portions 230 are equally spaced.

The ring portions 230 are disposed at equal intervals, which is beneficial to improving stability of the circuit layer 20.

In some embodiments, the coil assembly 100 further includes a cover layer (not shown). The cover layer may be wrapped around the spiral coil 23.

The above description is only one preferred embodiment of the present application, but is not limited to this embodiment during actual application. Other variations and modifications of the present application, which are apparent to those of ordinary skill in the art, are intended to be within the scope of the present application.

Claims

1. A coil assembly comprising a substrate layer and a wiring layer stacked in a first direction;

the circuit layer comprises a first lead, a second lead and a spiral coil, the spiral coil is provided with a first end and a second end, the spiral coil comprises an annular part, the annular part comprises a first part, a first groove is formed in the surface of the first part, which faces the base material layer, the first lead is electrically connected to the second end, the second lead comprises a first lead part and a second lead part which are connected, the first lead part is electrically connected to the first end and penetrates through the first groove, the first lead part comprises a first surface, which is far away from the base material layer, and two second surfaces, which are oppositely arranged, connected between the first surface and the base material layer, and the second lead part and the first lead are both positioned on the outer side of the spiral coil;

the coil assembly further comprises an insulating layer, wherein the insulating layer is arranged in a gap between the first part and the inner wall of the first groove, the insulating layer is connected between the first part and the first surface, and the insulating layer is further connected between the first part and each second surface.

2. The coil assembly of claim 1 wherein said spiral coil includes at least two connected said annular portions, said first portion of each of said annular portions being provided with one of said first grooves, said first lead portion passing through each of said first grooves.

3. The coil assembly of claim 2 wherein the first portion includes two first end surfaces parallel in a second direction and two second end surfaces parallel in a third direction, the first direction and the second direction being perpendicular to each other, the first lead portion passing through the two first end surfaces in the second direction, the two second end surfaces being located on opposite sides of the first lead portion in the third direction, respectively, the second end surfaces forming an acute angle with the second direction, the two first end surfaces and the two second end surfaces enclosing a parallelogram when viewed in the first direction.

4. The coil assembly of claim 3 wherein said annular portion further comprises a second portion electrically connected to one of said first end surfaces and a third portion electrically connected to the other of said first end surfaces, said third portion and said second portion of adjacent two of said annular portions being electrically connected, said first lead being electrically connected to said second portion of said outermost annular portion, each of said second portion and said third portion having an area of cross section parallel to said first direction that is equal to an area of cross section of said first lead portion parallel to said third direction.

5. The coil assembly of claim 4 wherein each of the second and third portions has a cross-section parallel to the first direction that is also equal to an area of the cross-section of the first portion parallel to the second direction.

6. The coil assembly of claim 2 wherein at least two of said first grooves and said first ends are aligned in a second direction perpendicular to said first direction, said first lead portions extending from said first ends in said second direction.

7. The coil assembly of claim 6 wherein said first portions of at least two of said annular portions are equally spaced along said second direction.

8. The coil assembly of claim 4 or 5 wherein said second portions of at least two of said annular portions are equally spaced apart and said third portions of at least two of said annular portions are equally spaced apart.

9. The coil assembly of claim 1 wherein said first end is provided with a second recess, said first face and one of said second faces being secured within said second recess.

10. The coil assembly of claim 1 wherein said second lead portion and said first lead are parallel to each other.