EP-4742285-A1 - COIL COMPONENT, POWER TRANSMISSION DEVICE, POWER RECEPTION DEVICE, MOBILE BODY, AND POWER TRANSMISSION SYSTEM

EP4742285A1EP 4742285 A1EP4742285 A1EP 4742285A1EP-4742285-A1

Abstract

A coil component (5) includes a coil 10 including first and second planar coil elements 11 and 12. The planar coil elements 11 and 12 have spiral shapes having a plurality of turn portions 111 to 116 and 121 to 123, respectively. The planar coil elements 11 and 12 are disposed to face each other in an axial direction extending along central axes C1 and C2 of the spiral shapes. The planar coil elements 11 and 12 are connected in series to each other. The number of turns T2 of the second planar coil element 12 is smaller than the number of turns T1 of the first planar coil element 11. Furthermore, as viewed in the axial direction, at least one of the plurality of turn portions 121 to 123 of the second planar coil element 12 overlaps two or more of the plurality of turn portions 111 to 116 of the first planar coil element 11. Furthermore, as viewed in the axial direction, each gap between the plurality of turn portions 121 to 123 of the second planar coil element 12 overlaps any one of the gaps between the plurality of turn portions 111 to 116 of the first planar coil element 11.

Inventors

OKABE, MASATO

Assignees

Dai Nippon Printing Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240621

Claims (19)

A coil component comprising: a coil including a first planar coil element and a second planar coil element each having a spiral shape having a plurality of turn portions, the first and second planar coil elements being disposed to face each other in an axial direction extending along central axes of the spiral shapes and being connected in series to each other, wherein the number of turns of the second planar coil element is smaller than the number of turns of the first planar coil element, as viewed in the axial direction, at least one of the plurality of turn portions of the second planar coil element overlaps two or more of the plurality of turn portions of the first planar coil element, and as viewed in the axial direction, each gap between the plurality of turn portions of the second planar coil element overlaps any one of gaps between the plurality of turn portions of the first planar coil element.
The coil component according to claim 1, wherein the number of turns of the first planar coil element is twice the number of turns of the second planar coil element, and as viewed in the axial direction, each turn portion of the second planar coil element overlaps two turn portions of the first planar coil element.
The coil component according to claim 1, wherein, as viewed in the axial direction, a radially inner edge of each turn portion of the second planar coil element overlaps a radially inner edge of any of the turn portions of the first planar coil element, and a radially outer edge of each turn portion of the second planar coil element overlaps a radially outer edge of any of the turn portions of the first planar coil element.
The coil component according to claim 1, wherein the plurality of turn portions of the second planar coil element are provided with a slotted hole extending along the turn portions of the second planar coil element.
The coil component according to claim 4, wherein the slotted hole extends along the spiral shape of the second planar coil element.
The coil component according to claim 4, wherein, as viewed in the axial direction, the slotted hole overlaps any one of the gaps between the plurality of turn portions of the first planar coil element.
The coil component according to claim 1, wherein the thickness of the second planar coil element is 0.15 mm or more and 0.35 mm or less.
The coil component according to claim 1, further comprising a magnetic shield member disposed to face the second planar coil element.
The coil component according to claim 8, further comprising a magnetic wall portion extending in the axial direction and extending along the gaps between the plurality of turn portions of the first planar coil element as viewed in the axial direction, wherein the magnetic wall portion is disposed to face a second surface of the first planar coil element, the second surface being opposite to a first surface of the first planar coil element facing the second planar coil element.
The coil component according to claim 8, further comprising a magnetic wall portion extending in the axial direction and extending along the gaps between the plurality of turn portions of the first planar coil element as viewed in the axial direction, wherein the magnetic wall portion extends in the axial direction from one side to the other side of the first planar coil element through the gaps between the plurality of turn portions of the first planar coil element.
The coil component according to claim 1, further comprising a magnetic shield member disposed to face the first planar coil element.
The coil component according to claim 11, further comprising a magnetic wall portion extending in the axial direction and extending along the gaps between the plurality of turn portions of the second planar coil element as viewed in the axial direction, wherein the magnetic wall portion is disposed to face a fourth surface of the second planar coil element, the fourth surface being opposite to a third surface of the second planar coil element facing the first planar coil element.
The coil component according to claim 11, further comprising a magnetic wall portion extending in the axial direction and extending along the gaps between the plurality of turn portions of the second planar coil element as viewed in the axial direction, wherein the magnetic wall portion extends in the axial direction from one side to the other side of the second planar coil element through the gaps between the plurality of turn portions of the second planar coil element.
The coil component according to claim 11, wherein the plurality of turn portions of the second planar coil element are provided with a slotted hole extending along the turn portions of the second planar coil element, the coil component further comprises an additional magnetic wall portion, the additional magnetic wall portion extends in the axial direction and extends along the slotted hole as viewed in the axial direction, and the additional magnetic wall portion is disposed to face a fourth surface of the second planar coil element, the fourth surface being opposite to a third surface of the second planar coil element facing the first planar coil element.
The coil component according to claim 11, wherein the plurality of turn portions of the second planar coil element are provided with a slotted hole extending along the turn portions of the second planar coil element, the coil component further comprises an additional magnetic wall portion, the additional magnetic wall portion extends in the axial direction and extends along the slotted hole as viewed in the axial direction, and the additional magnetic wall portion extends in the axial direction from one side to the other side of the second planar coil element through the slotted hole provided in the plurality of turn portions of the second planar coil element.
A power transmitter comprising the coil component according to claim 1.
A power receiver comprising the coil component according to claim 1.
A mobile body comprising the power receiver according to claim 17.
A power transmission system comprising a power transmitter and a power receiver, wherein at least one of the power transmitter and the power receiver includes the coil component according to claim 1.

Description

Technical Field The present disclosure relates to a coil component, a power transmitter, a power receiver, a mobile body, and a power transmission system. Background Art Wireless power transmission systems that transmit power in a non-contact manner are becoming widespread. When power is transmitted in a non-contact manner, a high-frequency current is caused to flow through a resonant circuit including a coil. A coil component used in such a resonant circuit is disclosed in PTL 1. The coil component disclosed in PTL 1 uses a coil formed by stacking two plate-shaped planar coil elements having a spiral shape. This reduces the size of the coil in plan view. When the coil is formed as a stacked structure of two planar coil elements, two planar coil elements having the same or corresponding patterns (that is, having the same number of turns and the same pitch of turn portions) are produced, as disclosed in PTL 1. Then, the two planar coil elements are superposed one above the other and electrically connected. Citation List Patent Literature PTL 1: Japanese Unexamined Patent Application Publication No. 2021-27112 Meanwhile, it is required to improve the production efficiency of coil components. The production efficiency of coil components can be improved, for example, by improving the ease of handling of members constituting a coil component. In particular, in the case of a coil component in which the planar coil elements have a small thickness, difficulty in handling the planar coil elements when assembling the coil component is problematic. The purpose of an embodiment of the present disclosure is to improve the production efficiency of coil components. Disclosure of Invention An embodiment of the present disclosure relates to [1] to [19] below. [1] A coil component including: a coil including a first planar coil element and a second planar coil element each having a spiral shape having a plurality of turn portions, the first and second planar coil elements being disposed to face each other in an axial direction extending along central axes of the spiral shapes and being connected in series to each other, wherein the number of turns of the second planar coil element is smaller than the number of turns of the first planar coil element,as viewed in the axial direction, at least one of the plurality of turn portions of the second planar coil element overlaps two or more of the plurality of turn portions of the first planar coil element, andas viewed in the axial direction, each gap between the plurality of turn portions of the second planar coil element overlaps any one of gaps between the plurality of turn portions of the first planar coil element.[2] The coil component according to [1], wherein the number of turns of the first planar coil element is twice the number of turns of the second planar coil element, and as viewed in the axial direction, each turn portion of the second planar coil element overlaps two turn portions of the first planar coil element.[3] The coil component according to [1] or [2], wherein, as viewed in the axial direction, a radially inner edge of each turn portion of the second planar coil element overlaps a radially inner edge of any of the turn portions of the first planar coil element, and a radially outer edge of each turn portion of the second planar coil element overlaps a radially outer edge of any of the turn portions of the first planar coil element.[4] The coil component according to any one of [1] to [3], wherein the plurality of turn portions of the second planar coil element are provided with a slotted hole extending along the turn portions of the second planar coil element.[5] The coil component according to [4], wherein the slotted hole extends along the spiral shape of the second planar coil element.[6] The coil component according to [4] or [5], wherein, as viewed in the axial direction, the slotted hole overlaps any one of the gaps between the plurality of turn portions of the first planar coil element.[7] The coil component according to any one of [1] to [6], wherein the thickness of the second planar coil element is 0.15 mm or more and 0.35 mm or less.[8] The coil component according to any one of [1] to [7], further including a magnetic shield member disposed to face the second planar coil element.[9] The coil component according to [8], further including a magnetic wall portion extending in the axial direction and extending along gaps between the plurality of turn portions of the first planar coil element as viewed in the axial direction, wherein the magnetic wall portion is disposed to face a second surface of the first planar coil element, the second surface being opposite to a first surface of the first planar coil element facing the second planar coil element.[10] The coil component according to [8], further including a magnetic wall portion extending in the axial direction and extending along gaps between the plurality of turn portions of the first planar coil