KR-102962943-B1 - WIRELESS CHARGING MAGNETIC MATERIAL AND MANUFACTURING METHOD THEREOF

Abstract

A magnetic body for wireless charging according to one embodiment comprises a Mn-Zn ferrite sintered body; a thermosetting powder-type paint; and a Mn-Zn ferrite sintered powder; wherein the Mn-Zn ferrite sintered body comprises a Mn-Zn ferrite sintered tile or a Mn-Zn ferrite sintered chip, and the magnetic body for wireless charging can be implemented in a three-dimensional shape.

Inventors

• 김영민

Assignees

• 현대자동차주식회사
• 기아 주식회사

Dates

Publication Date

20260511

Application Date

20220630

Claims (19)

1. In a magnetic material for wireless charging, Mn-Zn ferrite sintered body; Thermosetting powder paint; and Includes Mn-Zn ferrite sintered powder; The above Mn-Zn ferrite sintered body comprises Mn-Zn ferrite sintered tiles or Mn-Zn ferrite sintered chips, and The above thermosetting powder paint comprises any one of acrylic, polyester, and epoxy series, and The above thermosetting powder paint has a diameter of 30 to 40 μm, and The above-described magnetic material for wireless charging is a magnetic material for wireless charging implemented in a three-dimensional shape.
2. In paragraph 1, The above Mn-Zn ferrite sintered tile is, A magnetic body for wireless charging disposed between a powder body in a sandwich form, comprising the Mn-Zn ferrite sintered powder and the thermosetting powder-type paint.
3. In paragraph 2, The above Mn-Zn ferrite sintered tile is, A magnetic material for wireless charging arranged parallel to the ground.
4. In paragraph 1, The above Mn-Zn ferrite sintered chip is, A magnetic material for wireless charging that is mixed with the above Mn-Zn ferrite sintered powder and the above thermosetting powder-type paint and is uniformly distributed throughout the entire magnetic material for wireless charging.
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7. In paragraph 1, The above Mn-Zn ferrite sintered powder is, A magnetic material for wireless charging containing coarse and fine particles.
8. In Paragraph 7, The above Mn-Zn ferrite sintered powder coarse powder is, The diameter is 80 to 100 μm, and The above-mentioned fine Mn-Zn ferrite sintered powder is, A magnetic material for wireless charging having a diameter of 10 to 20 μm.
9. In paragraph 1, A magnetic material for wireless charging with a charging efficiency of 90% or higher.
10. In paragraph 1, A magnetic material for wireless charging having a cross-sectional area of 0.01 m² or more and a thickness of 5 to 10 mm.
11. A raw material preparation step for preparing an Mn-Zn ferrite sintered body, a thermosetting powder-type paint, and Mn-Zn ferrite sintered powder; A mixing step of mixing coarse Mn-Zn ferrite sintered powder and fine Mn-Zn ferrite sintered powder, and then mixing a thermosetting powder-type paint to produce a powder body; A filling and tapping step of filling the powder body and the Mn-Zn ferrite sintered body into a three-dimensional mold and then tapping; A curing step comprising heating and curing the above-mentioned tapped material to manufacture a magnetic material; The above Mn-Zn ferrite sintered body comprises Mn-Zn ferrite sintered tiles or Mn-Zn ferrite sintered chips, and The above thermosetting powder paint comprises any one of acrylic, polyester, and epoxy series, and A method for manufacturing a magnetic material for wireless charging, wherein the above thermosetting powder-type paint has a diameter of 30 to 40 μm.
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14. In Paragraph 11, The above Mn-Zn ferrite sintered powder is, A method for manufacturing a magnetic material for wireless charging, comprising coarse and fine particles.
15. In Paragraph 14, The above Mn-Zn ferrite sintered powder coarse powder is, The diameter is 80 to 100 μm, and The above-mentioned fine Mn-Zn ferrite sintered powder is, Method for manufacturing a magnetic material for wireless charging having a diameter of 10 to 20 μm.
16. In Paragraph 11, In the above filling and tapping steps, The above Mn-Zn ferrite sintered tile is, A method for manufacturing a magnetic material for wireless charging, wherein the above-mentioned Mn-Zn ferrite sintered powder and the above-mentioned thermosetting powder-type paint are mixed, filled in a sandwich form between the powder bodies, and then tapped.
17. In Paragraph 16, The above Mn-Zn ferrite sintered tile is, Method for manufacturing a magnetic material for wireless charging, filled parallel to the ground.
18. In Paragraph 11, In the above filling and tapping steps, The above Mn-Zn ferrite sintered chip is, A method for manufacturing a magnetic material for wireless charging, wherein the above-mentioned Mn-Zn ferrite sintered powder and the above-mentioned thermosetting powder-type paint are mixed, uniformly filled throughout a three-dimensional mold, and then tapped.
19. In Paragraph 11, A method for manufacturing a magnetic material for wireless charging, wherein the curing step is performed by heating to 160 to 200°C at a heating rate of 5 to 50°C/min and then maintaining for 15 to 80 minutes.

Description

Wireless Charging Magnetic Material and Manufacturing Method Thereof The present invention relates to a magnetic material for wireless charging and a method for manufacturing the same, wherein a three-dimensional shape is realized by mixing a Mn-Zn ferrite sintered body with powder. An electric vehicle battery wireless charging device consists of a coil that converts electrical energy into magnetic energy (magnetic field) and a magnetic material responsible for reinforcing and shielding the generated magnetic field to have directionality. Generally, in the transmitter/receiver of a battery wireless charging device, a Mn-Zn ferrite sintered magnetic material with high permeability (about 4,000 μ) is used to consider charging efficiency. However, the above Mn-Zn ferrite sintered material has a high brittleness, so there is a problem that it is at high risk of easily breaking when an impact occurs while driving a vehicle. Meanwhile, magnetic materials used in wireless charging systems for vehicles require large magnetic materials of 300mm x 300mm or larger. To achieve this, a method of realizing large magnetic materials by arranging multiple Mn-Zn ferrite tiles is used. However, there are problems such as poor impact resistance due to high brittleness and reduced productivity due to inefficient assembly. FIG. 1 is a perspective view showing a magnetic body for wireless charging according to one embodiment. FIG. 2 is an image showing an Mn-Zn ferrite sintered tile according to one embodiment. Figure 3 is an image showing an Mn-Zn ferrite sintered chip according to one embodiment. Figure 4 is a schematic diagram showing a magnetic material for wireless charging utilizing Mn-Zn ferrite sintered tiles. Figure 5 is a schematic diagram showing a magnetic material for wireless charging utilizing an Mn-Zn ferrite sintered chip. FIG. 6 is a flowchart relating to a method for manufacturing a magnetic material for wireless charging according to one embodiment. Figure 7 is an image showing a three-dimensional mold used in the filling and tapping steps. The embodiments described in this specification and the configurations illustrated in the drawings are preferred examples of the disclosed invention, and various modifications that may replace the embodiments and drawings of this specification may exist at the time of filing this application. Furthermore, the terms used herein are for describing embodiments and are not intended to limit or/or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising,” “having,” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. The symbols attached to each step are used to identify each step and do not indicate the order of the steps relative to one another; the steps may be performed differently from the specified order unless a specific order is clearly indicated in the context. The expression “at least one of” used when referring to a list of elements in the specification may change the combination of elements. For example, the expression “at least one of a, b, or c” may be understood to indicate a combination of only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c. Hereinafter, embodiments of the invention will be described in detail with reference to the attached drawings. A magnetic body for wireless charging according to one embodiment of the present invention comprises a Mn-Zn ferrite sintered body; a thermosetting powder-type paint; and a Mn-Zn ferrite sintered powder; wherein the Mn-Zn ferrite sintered body comprises a Mn-Zn ferrite sintered tile or a Mn-Zn ferrite sintered chip, and the magnetic body for wireless charging can be implemented in a three-dimensional shape. FIG. 1 is a perspective view showing a magnetic body for wireless charging according to one embodiment. Referring to FIG. 1, the magnetic body (10) for wireless charging according to the present invention may include a center (11) and an edge portion (13), and may include a flat portion (12) on which a coil is placed. The magnetic body (10) for wireless charging may be manufactured by assembling four magnetic bodies manufactured by baking with a three-dimensional mold. FIG. 1 is illustrated as a square as an example, but it may be of various shapes. The above-mentioned magnetic body (10) for wireless charging comprises an Mn-Zn ferrite sintered body; a thermosetting powder-type paint (23); and an Mn-Zn ferrite sintered powder (24); and the Mn-Zn ferrite sintered body may comprise an Mn-Zn ferrite sintered tile (21) or an Mn-Zn ferrite sintered chip (22). FIG. 2 is an image showing an Mn-Zn ferrite sinte