KR102427170B1 - Wireless charging device and vehicle comprising same - Google Patents

Abstract

The wireless charging device according to an embodiment is provided with a hybrid (hybrid) type magnetic part including a first magnetic part and a second magnetic part having different magnetic permeability, so that heat generated during high-power wireless charging can be effectively reduced, Charging efficiency can be improved. In particular, when the compound magnetic permeability (CP) is controlled by appropriately adjusting the thickness and permeability of the first magnetic part and the second magnetic part, charging efficiency can be maximized, and heat reduction characteristics can be further improved. Therefore, the wireless charging device can be usefully used in electric vehicles that require large-capacity power transmission between a transmitter and a receiver.

Description

Wireless charging device and means of transportation including the same

The embodiment relates to a wireless charging device and a mobile means including the same. More specifically, the embodiment relates to a wireless charging device with improved charging efficiency by applying a heat dissipation structure, and a moving means including the same.

Today, the information and communication field is developing at a very fast pace, and various technologies that comprehensively combine electricity, electronics, communication, and semiconductor are continuously being developed. In addition, as the trend toward mobileization of electronic devices increases, research on wireless communication and wireless power transmission technology is being actively conducted in the communication field. In particular, research on a method of wirelessly transmitting power to an electronic device or the like is being actively conducted.

Meanwhile, as interest in electric vehicles has rapidly increased in recent years, interest in building charging infrastructure is increasing. Various charging methods such as electric vehicle charging using home chargers, battery replacement, fast charging devices, and wireless charging devices have already appeared, and new charging business models have also begun to appear (refer to Korean Patent Application Laid-Open No. 2011-0042403). In addition, electric vehicles and charging stations under test operation are starting to stand out in Europe, and in Japan, car manufacturers and electric power companies are piloting electric vehicles and charging stations.

In a conventional wireless charging device used for electric vehicles, etc., a magnetic part is disposed adjacent to a coil part in order to improve wireless charging efficiency, and a shield part (metal plate) for shielding is disposed spaced apart from the magnetic part by a predetermined interval.

The wireless charging device generates heat by the resistance of the coil part and the magnetic loss of the magnetic part during the wireless charging operation. In particular, the magnetic part in the wireless charging device generates heat in a portion close to the coil part with high electromagnetic wave energy density, and the generated heat changes the magnetic properties of the magnetic part to cause an impedance mismatch between the transmitting pad and the receiving pad, and the charging efficiency is lowered. As a result, there was a problem in that the heat was intensified again.

In particular, in the conventional wireless charging device, the magnetic part is mainly disposed between the sintered ferrite sheet and the coil part and the shield part, especially on one surface close to the coil part. The sintered ferrite sheet has low impact resistance and heavy specific gravity, and when it is placed close to the coil part, heat is generated from the coil part and the sintered ferrite sheet during charging. Alternatively, it is difficult to transmit and dissipate heat to the spacer part. Accordingly, the sintered ferrite sheet having an elevated temperature may have a problem in that the magnetic properties are lowered and the inductance value of the coil portion is changed accordingly, thereby lowering charging efficiency and causing more severe heat generation. In particular, when heat is increased during fast charging and high-power wireless charging, it may cause restrictions on usability due to safety issues, so it is necessary to develop a wireless charging device capable of simultaneously improving heat dissipation characteristics and charging efficiency at high power. .

Korean Patent Publication No. 2011-0042403

The present invention has been devised to solve the problems of the prior art, and the technical problem to be solved by the present invention is to use two or more hybrid type magnetic parts having different magnetic permeability from each other, but by arranging them in consideration of their characteristics, To provide a wireless charging device capable of improving charging efficiency and heat reduction characteristics during wireless charging.

Another technical problem to be solved by the present invention is to provide a moving means including the wireless charging device.

According to one embodiment, the coil unit; and a magnetic part disposed on the coil part, wherein the magnetic part comprises: a first magnetic part disposed on the coil part; and a second magnetic part disposed adjacent to the first magnetic part and having a magnetic permeability different from that of the first magnetic part, a wireless charging device is provided.

According to another embodiment, including a wireless charging device, the wireless charging device includes a coil unit; and a magnetic part disposed on the coil part, wherein the magnetic part comprises: a first magnetic part disposed on the coil part; and a second magnetic part disposed adjacent to the first magnetic part and having a magnetic permeability different from that of the first magnetic part.

According to the above embodiment, by providing two or more types of hybrid magnetic units having different magnetic permeability from each other, heat generated during wireless charging can be reduced and charging efficiency can be improved. In particular, in the case of controlling the compound magnetic permeability (CP) by appropriately adjusting the thickness and permeability of the first and second magnetic parts in the hybrid magnetic part, charging efficiency can be maximized, and heat reduction characteristics can be further improved. can

Accordingly, the wireless charging device may be usefully used in a moving means such as an electric vehicle that requires large-capacity power transmission between a transmitter and a receiver.

1a and 1b show an exploded perspective view of a wireless charging device according to an embodiment, respectively.
Figures 2a and 2b shows a perspective view of a wireless charging device according to the embodiment.
3A and 3B are cross-sectional views of a wireless charging device according to an embodiment.
3c to 3e are cross-sectional views of a wireless charging device according to another embodiment.
4 illustrates a process of forming a magnetic part through a mold according to an exemplary embodiment.
5 illustrates a moving means (electric vehicle) having a wireless charging device according to an embodiment.

Hereinafter, specific embodiments for implementing the spirit of the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated, and the size of each component does not fully reflect the actual size.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In this specification, like reference numerals refer to like elements.

In this specification, a component described as being formed above or below another component means that a component is formed directly above or below another component or indirectly through another component. include

In addition, the reference for the upper / lower of each component will be described with reference to the drawings. The size and thickness of each component in the drawings may be exaggerated for explanation, and may be different from the size actually applied.

Also, the meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component and It does not exclude the presence or addition of/or groups.

In addition, it should be understood that all numerical ranges indicating physical property values, dimensions, etc. of the components described in the present specification are modified by the term "about" in all cases unless otherwise specified.

In the present specification, unless otherwise specified, the expression "a" or "a" is interpreted as meaning including the singular or the plural as interpreted in context.

[Wireless charging device]

1a and 1b show an exploded perspective view of a wireless charging device according to an embodiment, FIGS. 2a and 2b show a perspective view of a wireless charging device according to the embodiment, and FIGS. 3a and 3b are wireless charging according to the embodiment A cross-sectional view of each device is shown. In addition, Figures 3c and 3e shows a cross-sectional view of a wireless charging device according to another embodiment.

The drawings shown in FIGS. 1 to 3 are illustratively shown according to embodiments, and may be variously changed as long as the effects of the present invention are not impaired.

1a to 1b, the wireless charging device 10 according to an embodiment, the coil unit 200; a first magnetic part 300 including a magnetic part disposed on the coil part 200 , wherein the magnetic part is disposed on the coil part 200 ; and a second magnetic part 500 disposed adjacent to the first magnetic part 300 and having a magnetic permeability different from that of the first magnetic part 300 . In addition, the wireless charging device 10 further includes a support part 100 for supporting the coil part 200 , a shield part 400 disposed on the magnetic part, and a housing 600 for protecting the components. may include

According to the exemplary embodiment of the present invention, by providing two or more types of hybrid magnetic units having different magnetic permeability from each other, heat generated during wireless charging can be reduced and charging efficiency can be improved.

On the other hand, when using a combination of two or more types as a hybrid type magnetic part and simply stacking these magnetic parts without special consideration, the transfer of heat generated because magnetic flux is not properly distributed during wireless charging is not effective and , and may be easily damaged by an external impact that may be applied while driving the vehicle.

According to the embodiment of the present invention, by using two or more types of hybrid magnetic units having different permeability from each other, the magnetic flux that is focused during wireless charging can be distributed in a desired direction, and in particular, during wireless charging compared to the second magnetic unit among the magnetic units. By disposing a first magnetic part having a smaller magnetic permeability on the coil part, and arranging the second magnetic part adjacent to the first magnetic part to adjust the composite permeability of the first magnetic part and the second magnetic part, heat dissipation characteristics And it is possible to maximize the charging efficiency.

Specifically, FIG. 1A is a configuration diagram of a wireless charging device 10 according to an embodiment of the present invention, in which a first magnetic part 300 and a second magnetic part 500 are sequentially stacked, in this case, The first magnetic part 300 has a low magnetic permeability at a frequency of 79 kHz to 90 kHz, specifically 85 kHz compared to the second magnetic part 500, and is disposed on the coil part 200, and the first magnetic part ( 300 ), the second magnetic part 500 having a higher magnetic permeability may be disposed close to the shield part 400 .

Figure 1b is a block diagram of the wireless charging device 10 according to another embodiment of the present invention, the first magnetic unit 300 has a three-dimensional structure, the second magnetic unit 500 is a region corresponding to the coil unit. is disposed only in, at this time, the first magnetic part 300 has a low magnetic permeability at a frequency of 79 kHz to 90 kHz, specifically 85 kHz compared to the second magnetic part 500, and is disposed on the coil part 200 and , the second magnetic part 500 having a higher magnetic permeability than the first magnetic part 300 may be disposed close to the shield part 400 .

According to another embodiment of the present invention, in the two or more types of hybrid magnetic parts having different magnetic permeability, the thickness of the first magnetic part and the second magnetic part may be adjusted to adjust their composite permeability, and in this case, charging Efficiency may be maximized, and heat reduction characteristics may be further improved.

Hereinafter, each component of the wireless charging device will be described in detail.

magnetic part

According to an embodiment of the present invention, the magnetic part may be two or more types of hybrid magnetic parts including a first magnetic part and a second magnetic part having different magnetic permeability.

In particular, the hybrid magnetic part may include a first magnetic part having high impact resistance and a weight reduction effect and a second magnetic part having a strong magnetic focusing force.

The first magnetic portion may have a greater impact resistance than the second magnetic portion (ferritic magnetic material) and have a weight reduction effect. However, when only the first magnetic part is used without using the hybrid type magnetic part, there may be effects such as impact resistance and weight reduction, but the magnetic focusing force (inductance) may be weak, and thus charging efficiency may be deteriorated.

On the other hand, although the second magnetic part has a strong magnetic focusing force, it is difficult to process a plate enlargement, and there may be restrictions in manufacturing and processing in the form of a thick film for automobiles.

Therefore, by using the second magnetic part having a strong magnetic focusing force together with the first magnetic part having high impact resistance and a weight reduction effect, the performance of the wireless charging device can be efficiently improved.

In addition, by disposing a second magnetic part having a higher magnetic permeability at 85 kHz than the first magnetic part among the hybrid magnetic parts adjacent to the first magnetic part disposed on the coil part, the hybrid magnetic part's composite magnetic permeability (CP) can be adjusted.

In the hybrid magnetic part, the compound magnetic permeability (CP) represented by Equation 1 below may be 101 to 290:

[Equation 1]

Here, P1 is the magnetic permeability of the first magnetic part,

Wherein P2 is the magnetic permeability of the second magnetic part,

T1 is a thickness of a region corresponding to the coil unit in the first magnetic unit,

T2 is a thickness of a region corresponding to the coil unit in the second magnetic unit,

Wherein a is 1 when the P1 is 10 or more and 1,000 or less, or 10 when the P1 is more than 1,000 to 8,000 or less, or 20 when the P1 is more than 8,000 to 30,000 or less,

b is 1 when P2 is 10 or more and 1,000 or less, 10 when P2 is 1,000 or more and 8,000 or less, or 20 when P2 is 8000 or more and 30,000 or less.

In the magnetic part, the compound magnetic permeability (CP) is, for example, 101 to 290, 101.5 to 280, 105 to 260, 105 to 250, 105 to 240, 105 to 235, 106 to 232, 110 to 230, 112 to 200 , 115 to 200, 101 to 150, or 151 to 290.

In the magnetic part, the wireless charging device designed by optimizing the thickness as well as the permeability of the first magnetic part and the second magnetic part to adjust the compound magnetic permeability (CP) can implement the complex magnetic permeability (CP) of the specific range. . In this case, it is possible to maximize charging efficiency and heat reduction characteristics at high power.

When the wireless charging device satisfies Equation 1, the performance of the wireless charging device, such as charging efficiency and heat reduction characteristics, can be efficiently improved because the required inductance of the magnetic part is satisfied and the resistance is lowered. On the other hand, when the wireless charging device is less than the range of Equation 1, due to the lack of inductance required for the magnetic part, the wireless charging charging efficiency may be lowered and the heat reduction characteristics may deteriorate, and when the range of Equation 1 is exceeded, Due to the increase in the resistance of the magnetic part, the wireless charging performance may be deteriorated.

By adjusting the thickness together with the permeability of the first magnetic part and the second magnetic part, the compound magnetic permeability (CP) of Equation 1 may be controlled. Accordingly, the thickness of the first magnetic part and the second magnetic part may be a very important factor in order to maximize the effect according to the embodiment of the present invention together with the magnetic permeability of each magnetic part.

In Equation 1, P1 may be 50 to 200, P2 may be 2,000 to 5,000, T1 may be 1 mm to 10 mm, and T2 may be 0.04 mm to 5 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 2,000 to 5,000, T1 may be 1 mm to 10 mm, and T2 may be 0.05 mm to 5 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 2,000 to 5,000, T1 may be 2 mm to 10 mm, and T2 may be 0.1 mm to 4 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 2,000 to 5,000, T1 may be 2 mm to 9.5 mm, and T2 may be 0.5 mm to 4 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 2,000 to 5,000, T1 may be 2 mm to 9.5 mm, and T2 may be 1 mm to 3 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 12,000 to 18,000, T1 may be 1 mm to 11 mm, and T2 may be 0.02 mm to 3 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 12,000 to 18,000, T1 may be 1 mm to 10.5 mm, and T2 may be 0.05 mm to 2.5 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 12,000 to 18,000, T1 may be 1 mm to 10 mm, and T2 may be 0.1 mm to 2.5 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 12,000 to 18,000, T1 may be 2 mm to 10 mm, and T2 may be 0.1 mm to 2 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 12,000 to 18,000, T1 may be 3 mm to 10 mm, and T2 may be 0.1 mm to 1.5 mm.

In Equation 1, P1 may be 50 to 200, P2 may be 12,000 to 18,000, T1 may be 3 mm to 10 mm, and T2 may be 0.1 mm to 1 mm.

According to an embodiment of the present invention, in Formula 1, P1 is 50 to 200, P2 is 2,000 to 5,000, and the ratio of T1 and T2 (T1:T2) is 1: 0.0009 to 1.5, 1: 0.008 to 1.5, 1: 0.008 to less than 1, 1: 0.008 to 0.7, 1: 0.008 to 0.68, 1: 0.009 to 0.68, 1: 0.09 to 0.68, 1: 0.1 to 0.67.

According to an embodiment of the present invention, in Formula 1, P1 is 50 to 200, P2 is 12,000 to 18,000, and the ratio of T1 and T2 (T1:T2) is 1: 0.009 to 0.9, 1: 0.009 to 0.5, 1: 0.009 to 0.3, 1: 0.009 to 0.25, or 1: 0.009 to 0.2.

When the ratio of T1 and T2 (T1:T2) satisfies the above range, the thickness ratio of the hybrid magnetic part is optimized, thereby effectively improving the performance of the wireless charging device.

The total thickness of T1 and T2 is 1 mm to 15.0 mm, 1.02 mm to 15.0 mm, 1.02 mm to 13.0 mm, 1.05 mm to 13.0 mm, 3.0 mm to 12.0 mm, 4.0 mm to 11.0 mm, 5.0 mm to 10.5 mm, 5.0 mm to 8.0 mm or greater than 8.0 mm to 10.5 mm or less. When the total thickness of T1 and T2 is too large, the weight of the magnetic part may increase, and thus there may be restrictions on the process or use.

In the wireless charging device according to an embodiment of the present invention, the magnetic permeability of the second magnetic part may be greater than the magnetic permeability of the first magnetic part. In addition, the magnetic permeability of the second magnetic part is greater than that of the first magnetic part, and a thickness of a region corresponding to the coil part in the first magnetic part is a thickness of a region corresponding to the coil part in the second magnetic part. can be larger than

The wireless charging device of the present invention can effectively reduce heat generated during wireless charging, and increase charging efficiency when high-power wireless charging of 3 kW to 22 kW, 4 kW to 20 kW, or 5 kW to 18 kW is performed. Because it can be improved, it can be usefully used for high-power wireless charging.

The wireless charging device according to an embodiment of the present invention includes two or more hybrid magnetic parts including a first magnetic part and a second magnetic part, so that the physical properties are different, in particular, the type of the first magnetic part and the second magnetic part , by designing their thickness ratio and transmittance to be optimized, it is possible to improve the characteristics of the wireless charging device, as well as improve charging efficiency and heat reduction characteristics.

Also, a second magnetic part having a higher magnetic permeability than the first magnetic part among the hybrid magnetic parts may be disposed close to the shield part. In this case, by effectively distributing magnetic flux density and heat dissipation to increase wireless charging efficiency, heat generated from the second magnetic unit may be radiated through the shield unit, thereby effectively improving heat dissipation characteristics.

As such, the characteristics of the wireless charging device may vary according to the type, thickness, magnetic permeability, and arrangement design of the first and second magnetic units.

Hereinafter, the first magnetic part and the second magnetic part will be described in detail.

first magnetic part

Type of first magnetic part

The magnetic part according to an embodiment of the present invention may include a first magnetic part, and the first magnetic part may include a polymer-type magnetic block (PMB) including a binder resin and magnetic powder dispersed in the binder resin. The first magnetic part includes a polymer-type magnetic block and magnetic powders are combined with each other by a binder resin, so that overall there are fewer defects in a large area, less damage by impact, excellent impact resistance, weight reduction, etc. can

The magnetic powder may be an oxide-based magnetic powder, a metal-based magnetic powder, or a mixed powder thereof. For example, the oxide-based magnetic powder may be a ferrite-based powder, specifically, a Ni-Zn-based, Mg-Zn-based, or Mn-Zn-based ferrite powder. In addition, the metal-based magnetic powder may be an Fe-Si-Al alloy magnetic powder or a Ni-Fe alloy magnetic powder, and more specifically, a sandust powder or permalloy powder.

As an example, the magnetic powder may have a composition of Formula 1 below.

[Formula 1]

Fe _1-abc Si _a X _b Y _c

wherein X is Al, Cr, Ni, Cu, or a combination thereof; Y is Mn, B, Co, Mo, or a combination thereof; 0.01 ≤ a ≤ 0.2, 0.01 ≤ b ≤ 0.1, and 0 ≤ c ≤ 0.05.

The average particle diameter of the magnetic powder may be in the range of about 3 nm to about 1 mm, about 1 μm to 300 μm, about 1 μm to 50 μm, or about 1 μm to 10 μm.

The first magnetic part may include the magnetic powder in an amount of 10 wt% or more, 50 wt% or more, 70 wt% or more, or 85 wt% or more.

For example, the first magnetic portion contains 10 wt% to 99 wt%, 10 wt% to 95 wt%, 50 wt% to 95 wt%, 50 wt% to 92 wt%, 70 wt% to 95 wt% of the magnetic powder. weight %, 80% to 95% by weight, or 80% to 90% by weight.

As the binder resin, polyimide resin, polyamide resin, polycarbonate resin, acrylonitrile-butadiene-styrene (ABS) resin, polypropylene resin, polyethylene resin, polystyrene resin, polyphenylsulfide (PSS) resin, polyether ether ketone (PEEK) resin, silicone resin, acrylic resin, polyurethane resin, polyester resin, isocyanate resin, epoxy resin and the like may be exemplified, but is not limited thereto.

For example, the binder resin may be a curable resin. Specifically, the binder resin may be a photocurable resin and/or a thermosetting resin, and in particular, may be a resin capable of exhibiting adhesiveness by curing. More specifically, the binder resin includes at least one functional group or site that can be cured by heat, such as a glycidyl group, an isocyanate group, a hydroxyl group, a carboxyl group, or an amide group; or at least one functional group or moiety that can be cured by active energy such as an epoxide group, a cyclic ether group, a sulfide group, an acetal group, or a lactone group resin can be used. Such a functional group or moiety may be, for example, an isocyanate group (-NCO), a hydroxyl group (-OH), or a carboxyl group (-COOH).

The first magnetic part may contain the binder resin in an amount of 5 wt% to 40 wt%, 5 wt% to 20 wt%, 5 wt% to 15 wt%, or 7 wt% to 15 wt%.

In addition, based on the weight of the first magnetic part, as the binder resin, 6 wt% to 12 wt% of a polyurethane-based resin, 0.5 wt% to 2 wt% of an isocyanate-based curing agent, and 0.3 wt% to 1.5 wt% of an epoxy-based resin.

Structural features of the first magnetic part

The first magnetic part is disposed between the coil part and the shield part.

The first magnetic part is disposed on the coil part.

In addition, the first magnetic part may be disposed to be spaced apart from the coil part by a predetermined interval. For example, the separation distance between the first magnetic part and the coil part may be 0.2 mm or more, 0.5 mm or more, 0.2 mm to 3 mm, or 0.5 mm to 2 mm.

In addition, the first magnetic part may be disposed to be spaced apart from the shield part by a predetermined interval. For example, the separation distance between the first magnetic part and the shield part may be 3 mm or more, 5 mm or more, 3 mm to 10 mm, or 4 mm to 7 mm.

According to an embodiment of the present invention, the first magnetic part may have a three-dimensional structure, and in this case, charging efficiency and heat dissipation characteristics may be improved.

Referring to FIGS. 1B and 3B , the first magnetic part 300 includes an outer part 310 corresponding to a part where the coil part 200 is disposed; and a central portion 320 surrounded by the outer portion 310 , wherein a thickness of the outer portion 310 may be greater than a thickness of the central portion 320 . In this case, in the first magnetic part, the outer part and the central part may be integrally formed with each other.

As described above, by increasing the thickness of the magnetic part near the coil where electromagnetic energy is concentrated during wireless charging and lowering the thickness of the central magnetic part having a relatively low electromagnetic energy density because there is no coil, the electromagnetic wave concentrated around the coil is effectively focused and charged. In addition to improving efficiency, it is possible to firmly maintain a distance between the coil unit and the shield unit without a separate spacer, thereby reducing material and processing costs due to the use of spacers.

In the first magnetic part, the outer part may have a thickness that is 1.5 times or more thicker than that of the central part. When the thickness ratio is, the magnetic field concentrated around the coil can be more effectively focused to improve charging efficiency, and it is also advantageous for heat generation and weight reduction. Specifically, in the first magnetic part, the thickness ratio of the outer part/central part may be 2 or more, 3 or more, or 5 or more. In addition, the thickness ratio may be 100 or less, 50 or less, 30 or less, or 10 or less. More specifically, the thickness ratio may be 1.5 to 100, 2 to 50, 3 to 30, or 5 to 10.

The thickness of the outer portion of the first magnetic part may be 1 mm or more, 3 mm or more, or 5 mm or more, and may be 30 mm or less, 20 mm or less, or 11 mm or less. In addition, the thickness of the center of the first magnetic part may be 10 mm or less, 7 mm or less, or 5 mm or less, and may be 0 mm, 0.1 mm or more, or 1 mm or more. Specifically, the outer portion of the first magnetic portion may have a thickness of 5 mm to 11 mm, and the central portion may have a thickness of 0 mm to 5 mm.

When the thickness of the central part 320 of the first magnetic part 300 is 0, the first magnetic part 300 may have an empty shape in the central part 320 (eg, a donut shape). In this case, the charging efficiency can be effectively improved even with a smaller area of the first magnetic part.

Also, according to an exemplary embodiment, the first magnetic part may have a planar structure (see FIGS. 3A and 3D ) rather than a three-dimensional structure. That is, in the first magnetic part, the outer part and the central part may have the same thickness.

Meanwhile, the first magnetic part may have a large area, specifically 200 cm ² or more, 400 cm ² or more, or 600 cm ² or more. Also, the first magnetic part may have an area of 10,000 cm ² or less.

The large-area first magnetic part may be configured by combining a plurality of unit magnetic parts, and in this case, an area of the unit magnetic part may be 60 cm ² or more, 90 cm ² , or 95 cm ² to 900 cm ² .

Alternatively, the first magnetic part may have an empty shape in the center, and in this case, the first magnetic part may have an area of the outer part, that is, an area corresponding to the coil part.

The first magnetic part may be a magnetic block manufactured by a method such as molding through a mold. For example, the first magnetic part may be molded into a three-dimensional structure through a mold. The magnetic sheet may be molded into a three-dimensional structure by mixing magnetic powder and a binder resin and injecting it into a mold by injection molding or the like.

Specifically, the molding may be performed by injecting the raw material of the magnetic part into the mold by injection molding. More specifically, the magnetic part is manufactured by mixing a magnetic powder and a polymer resin composition to obtain a raw material composition, and then injecting the raw material composition 701 into the mold 703 by an injection molding machine 702 as shown in FIG. 4 . can be In this case, by designing the internal shape of the mold 703 as a three-dimensional structure, the three-dimensional structure of the magnetic part can be easily implemented. Such a process may be difficult when an existing sintered ferrite sheet is used as a magnetic part.

Alternatively, the first magnetic part may be a laminate of magnetic sheets, and for example, 20 or more magnetic sheets, or 50 or more magnetic sheets may be laminated.

Specifically, the magnetic sheet stack may be one in which one or more additional magnetic sheets are further stacked only at the center of the first magnetic part. In this case, the individual magnetic sheet may have a thickness of 80 μm or more, or 85 μm to 150 μm. Such a magnetic sheet may be manufactured by a conventional sheet forming process, such as mixing magnetic powder and a binder resin to form a slurry, then forming and curing the magnetic sheet into a sheet shape.

Magnetic properties of the first magnetic part

The first magnetic part may have a magnetic characteristic of a certain level in the vicinity of a wireless charging standard frequency of the electric vehicle.

The wireless charging standard frequency of the electric vehicle may be less than 100 kHz, for example, 79 kHz to 90 kHz, specifically 81 kHz to 90 kHz, more specifically about 85 kHz, which is a mobile electronic device such as a mobile phone. It is a band distinct from the applied frequency.

In the frequency band of 85 kHz of the first magnetic part, the magnetic permeability may vary depending on the material, and may be in the range of 5 to 150,000, and depending on the specific material, 10 to 30,000, 10 or more to 1,000 or less, 1,000 to 8,000 or less, 8,000 greater than and up to 30,000, or from 50 to 200. In addition, the investment loss in the 85 kHz frequency band of the first magnetic part may vary depending on the material, and may be 0 to 50,000 in a wide range, and 0 to 1,000, 1 to 100, 100 to 1,000, or 5,000 to 1,000 depending on the specific material. It can be 50,000.

As a specific example, when the first magnetic part is a polymer-type magnetic block including a magnetic powder and a binder resin, the magnetic permeability in the frequency band of 85 kHz is 5 to 500, or 50 to 200, 50 to 130, 55 to 120, or It may be 10 to 50, and the investment loss may be 0 to 50, 0 to 20, 0 to 15, or 0 to 5.

Physical properties of the first magnetic part

The first magnetic part may be elongated at a certain rate. For example, the elongation of the first magnetic part may be 0.5% or more. The elongation property is difficult to obtain in a ceramic magnetic part to which a polymer is not applied, and damage can be reduced even when a large-area magnetic part is distorted due to an impact. Specifically, the elongation of the first magnetic part may be 0.5% or more, 1% or more, or 2.5% or more. There is no particular limitation on the upper limit of the elongation, but if the content of the polymer resin is increased to improve the elongation, properties such as inductance of the magnetic part may be deteriorated, so that the elongation is preferably 10% or less.

The first magnetic part has a small rate of change in characteristics before and after impact, and is significantly superior to that of a general ferrite magnetic sheet.

In the present specification, the characteristic change rate (%) before and after the impact of a certain characteristic may be calculated by the following formula.

Characteristic change rate (%) = | Property Values Before Impact - Property Values After Impact | / pre-impact property value x 100

For example, the inductance change rate before and after the impact applied by free-falling from a height of 1 m to the first magnetic part may be less than 5%, or less than 3%. More specifically, the inductance change rate may be 0% to 3%, 0.001% to 2%, or 0.01% to 1.5%. When it is within the above range, the inductance change rate before and after the impact is relatively small, so that the stability of the magnetic part may be further improved.

In addition, the first magnetic part may be free-falling from a height of 1 m and a change rate of a quality factor (Q factor) before and after the applied impact may be 0% to 5%, 0.001% to 4%, or 0.01% to 2.5%. When it is within the above range, there is little change in characteristics before and after the impact, so that the stability and impact resistance of the magnetic part may be further improved.

In addition, the resistance change rate before and after the impact applied by free-falling from a height of 1 m to the first magnetic part may be 0% to 2.8%, 0.001% to 1.8%, or 0.1% to 1.0%. When it is within the above range, the resistance value may be well maintained below a certain level even if it is repeatedly applied in an environment to which an actual shock and vibration are applied.

In addition, the charge efficiency change rate before and after the impact applied by free-falling from a height of 1 m to the first magnetic part may be 0% to 6.8%, 0.001% to 5.8%, or 0.01% to 3.4%. When it is within the above range, the characteristics of the large-area magnetic part may be more stably maintained even if impact or distortion occurs repeatedly.

second magnetic part

Type of second magnetic part

The magnetic part according to an embodiment of the present invention includes a second magnetic part having a magnetic permeability different from that of the first magnetic part. The second magnetic part may include a ferritic magnetic material, a nanocrystalline magnetic material, or a combination thereof. The second magnetic part may be a ferritic magnetic material, and specifically, may include an oxide-based magnetic material, a metal-based magnetic material, or a composite material thereof.

According to the embodiment of the present invention, by using a material having a strong magnetic focusing force as the second magnetic portion, the disadvantage of the first magnetic portion, which may cause a decrease in charging efficiency due to a weak magnetic focusing force (inductance), can be compensated. have.

If only the first magnetic part is used without the second magnetic part, there may be effects such as impact resistance and weight reduction, but the magnetic focusing force (inductance) may be weak, and thus charging efficiency may be deteriorated. On the other hand, although the second magnetic part has a strong magnetic focusing force, it is difficult to process a plate enlargement, and there may be restrictions in manufacturing and processing in the form of a thick film for automobiles. Therefore, by using the second magnetic part having a strong magnetic focusing force together with the first magnetic part having high impact resistance and a weight reduction effect, the performance of the wireless charging device can be efficiently improved.

The oxide-based magnetic material may be a ferrite-based material, and a specific chemical formula may be expressed as MOFe ₂ O ₃ (where M is one or more divalent metal elements such as Mn, Zn, Cu, and Ni). The ferritic material is advantageous in terms of magnetic properties such as magnetic permeability that it is a sintered body. The ferritic material may be manufactured in the form of a sheet or block by mixing raw materials, calcining, pulverizing, mixing this with a binder resin, molding, and firing.

More specifically, the oxide-based magnetic material may be a Ni-Zn-based, Mg-Zn-based, or Mn-Zn-based ferrite, and in particular, the Mn-Zn-based ferrite is a Mn-Zn-based ferrite over a temperature range of room temperature to 100° C. or higher at a frequency of 85 kHz. It can exhibit high magnetic permeability, low investment loss, and high saturation magnetic flux density.

The Mn-Zn-based ferrite is iron oxide Fe ₂ O ₃ 66 mol% to 70 mol%, ZnO 10 mol% to 20 mol%, MnO 8 mol% to 24 mol%, NiO 0.4 mol% to 2 mol% as a main component. and SiO ₂ , CaO, Nb ₂ O ₅ , ZrO ₂ , SnO and the like as other subcomponents. The Mn-Zn-based ferrite is mixed with a main component in a predetermined molar ratio, calcined in air at a temperature of 800° C. to 1100° C. for 1 hour to 3 hours, and then pulverized by adding sub-components, and thus a binder such as polyvinyl alcohol (PVA) After mixing the resin in an appropriate amount and press-molding using a press, the temperature is raised to 1200° C. to 1300° C. and calcined for 2 hours or more, thereby producing a sheet or block form. Thereafter, it is cut to a required size through processing using a wire saw or a water jet, if necessary.

In addition, the metal-based magnetic material may be a Fe-Si-Al alloy magnetic material or a Ni-Fe alloy magnetic material, and more specifically, sandust (sendust) or permalloy (permalloy).

In addition, the second magnetic part may include a nanocrystalline magnetic material, for example, a Fe-based nanocrystalline magnetic material, specifically, a Fe-Si-Al-based nanocrystalline magnetic material, Fe-Si-Cr It may include a nanocrystalline magnetic material based on, or a magnetic nanocrystalline material based on Fe-Si-B-Cu-Nb. When the nanocrystalline magnetic material is applied to the second magnetic part, the higher the distance from the coil part, the lower the resistance (Rs) even if the inductance (Ls) of the coil part is lowered, so that the quality factor (Q factor) of the coil part : Ls/Rs) increases, so charging efficiency can be improved and heat generation can be reduced.

The second magnetic part may be made of a magnetic material different from that of the first magnetic part. As a specific example, the first magnetic part includes a Fe-Si-Al-based alloy magnetic material, and the second magnetic part includes Mn-Zn-based ferrite, Fe-Si-Al-based nanocrystalline magnetic powder, and Fe-Si-Cr. It may include at least one selected from the group consisting of a nanocrystalline magnetic powder based on nanocrystalline and Fe-Si-B-Cu-Nb based nanocrystalline magnetic powder. The combination of the first magnetic part and the second magnetic part is advantageous in that the second magnetic part has a higher magnetic permeability at 85 kHz than the first magnetic part.

Structural features of the second magnetic part

The second magnetic part may have a sheet shape or a block shape.

In addition, the thickness of the second magnetic part may be 0.5 mm to 5 mm, specifically, 0.5 mm to 3 mm, 0.5 mm to 2 mm, or 1 mm to 2 mm.

The second magnetic part may have the same area as the first magnetic part, or may have a different area from that of the first magnetic part.

For example, the second magnetic part may have the same large area as the first magnetic part. Specifically, the area of the second magnetic part may be 200 cm ² or more, 400 cm ² or more, or 600 cm ² or more. Also, the area of the second magnetic part may be 10,000 cm ² or less.

Alternatively, the second magnetic part may have a smaller area than the first magnetic part. For example, when the second magnetic portion is disposed only on the outer portion of the first magnetic portion, the second magnetic portion may have an area corresponding to the area of the outer portion. Also, according to this, the second magnetic part may be disposed at a position corresponding to the coil part, and may have an area corresponding to the area of the coil part. In this case, the second magnetic part can effectively improve charging efficiency and heat dissipation characteristics even with a small area.

Magnetic properties of the second magnetic part

The second magnetic unit may have a magnetic characteristic in a specific range near the wireless charging standard frequency of the electric vehicle.

For example, the magnetic permeability P2 in the 85 kHz frequency band of the second magnetic part may vary depending on the material, and may have a magnetic permeability of 10 to 150,000 in a wide range.

The P2 may be 10 or more to 30,000 or less, 10 or more to 1,000 or less, 1,000 or more to 8,000 or less, or 8,000 or more to 30,000 or less.

The magnetic permeability P2 of the second magnetic part may be greater than the magnetic permeability P1 of the first magnetic part.

In addition, the magnetic permeability of the second magnetic part may be 500 to 3,500, 1,000 to 5,000, more than 5,000 to 20,000, more than 10,000 to 100,000, or 8,000 to 150,000 depending on a specific material.

In addition, the investment loss in the 85 kHz frequency band of the second magnetic part may vary depending on the material, and may be 0 to 50,000 in a wide range, and 0 to 1,000, 1 to 100, 100 to 1,000, or 5,000 to 1,000 depending on the specific material. It can be 50,000.

As a specific example, when the second magnetic part is a ferritic material, the magnetic permeability in a frequency band of 85 kHz may be 1,000 to 5,000, more than 1,000 to less than 5,000, 2,000 to 5,000, or 2,000 to 4,000, and the investment loss is 0 to 1,000 , 0 to 500, 0 to 100, or 0 to 50.

As another example, when the second magnetic part is a nanocrystalline magnetic material, the magnetic permeability in the frequency band of 85 kHz is 5,000 or more, 5,000 to 180,000, 5,000 to 180,000, 12,000 to 18,000, 13,000 to 17,000, 14,000 to 16,000 can have a permeability of In addition, the investment loss may be 100 to 50,000, or 1,000 to 10,000.

arrangement of the second magnetic part

3A to 3E , the second magnetic part 500 may be disposed adjacent to the first magnetic part 300 .

Specifically, by disposing a second magnetic part having a higher magnetic permeability at 85 kHz than the first magnetic part among the hybrid magnetic parts adjacent to the first magnetic part disposed on the coil part, the composite magnetic permeability (CP) of the hybrid magnetic part ) can be adjusted, and when the hybrid magnetic part has a specific complex permeability, charging efficiency and heat dissipation characteristics can be maximized.

Also, the second magnetic part 500 may be disposed between the shield part 400 and the first magnetic part 300 .

In addition, the second magnetic part may be disposed between the shield part and the first magnetic part, and the second magnetic part may be thermally connected to the shield part and electrically insulated.

In addition, the second magnetic part may have a higher magnetic permeability at 85 kHz than the first magnetic part, and may be disposed close to the shield part.

As described above, by disposing the second magnetic part having a higher magnetic permeability than the first magnetic part close to the shield part, it is possible to effectively disperse the high magnetic flux density around the coil part, so that when the first magnetic part is used alone As compared to , it is possible to not only increase the charging efficiency but also effectively dissipate heat that is concentrated in the vicinity of the coil part of the first magnetic part.

Also, at least a portion of the second magnetic part may contact the shield part. Accordingly, heat generated from the second magnetic part may be effectively discharged through the shield part. For example, when the second magnetic part is in the form of a sheet, an entire surface of the second magnetic part may contact the shield part. The second magnetic part may be attached to one surface of the shield part with a thermally conductive adhesive, thereby further enhancing the heat dissipation effect. The thermally conductive adhesive may include a thermally conductive material such as a metal-based, carbon-based, or ceramic-based adhesive, for example, an adhesive resin in which thermally conductive particles are dispersed.

In addition, as shown in FIG. 3A , the second magnetic part 500 is located in both the outer part 310 corresponding to the coil part 200 and the central part 320 surrounded by the outer part 310 . can be deployed

Also, as shown in FIGS. 3B to 3D , the second magnetic part 500 may be disposed only in the outer part 310 corresponding to the coil part 200 . Accordingly, a high magnetic flux density around the coil part can be effectively dispersed, and thus charging efficiency can be increased compared to the case where the first magnetic part is used alone.

Alternatively, the second magnetic part may be disposed over at least a portion of the outer part and the central part.

The second magnetic part may be disposed to be coupled to or separated from the first magnetic part.

Meanwhile, the second magnetic part may also contact the first magnetic part. For example, referring to FIGS. 3B to 3D , the second magnetic part 500 may be attached to an outer portion of the first magnetic part 300 .

Alternatively, the second magnetic part may be disposed to be spaced apart from the first magnetic part by a predetermined distance. For example, the separation distance between the first magnetic part and the second magnetic part is 1 mm or more, 2 mm or more, 1 mm to 10 mm, 2 mm to 7 mm, 3 mm to 5 mm, or 5 mm to 10 mm. can

In addition, referring back to FIG. 3C , the first magnetic part 300 may have a groove on the surface facing the shield part 400 , and the second magnetic part 500 may be inserted into the groove to be disposed. have.

In this case, since the first magnetic part may serve as a housing of the second magnetic part, a separate adhesive or structure for fixing the second magnetic part may not be required. In particular, since the first magnetic part can be molded into a three-dimensional structure through a mold using a polymer-type magnetic part using magnetic powder and a binder resin, a groove for inserting the second magnetic part can be easily formed.

In this case, at least a portion of the first magnetic part and the second magnetic part may contact the shield part. Accordingly, heat generated in the first magnetic part and/or the second magnetic part may be effectively discharged through the shield part.

The depth of the groove formed in the first magnetic part may be the same as or different from the thickness (height) of the second magnetic part. When the depth of the groove and the thickness of the second magnetic part are the same, the first magnetic part and the second magnetic part may contact the shield part at the same time. Alternatively, when the depth of the groove is smaller than the thickness of the second magnetic part, only the second magnetic part may contact the shield part. Conversely, when the depth of the groove is greater than the thickness of the second magnetic part, only the first magnetic part may contact the shield part.

Also, referring to FIGS. 3A and 3E , the second magnetic part 500 may be disposed to be spaced apart from the shield part 400 by a predetermined distance. In addition, a spacer part 700 may be further included between the second magnetic part 500 and the shield part 400 . The spacer part 700 may be an empty space.

In addition, referring to FIG. 3E , the second magnetic part 500 is disposed to be spaced apart from the shield part 400 by a predetermined distance, and at least a part of the spacer part is made of a material and structure of a typical housing used in a wireless charging device. A spacer insertion part 750 employing .

coil part

A wireless charging device according to an embodiment of the present invention includes a coil unit through which an alternating current flows to generate a magnetic field.

The coil unit may include a conductive wire.

The conductive wire includes a conductive material. For example, the conductive wire may include a conductive metal. Specifically, the conductive wire may include one or more metals selected from the group consisting of copper, nickel, gold, silver, zinc, and tin.

In addition, the conductive wire may have an insulating sheath. For example, the insulating shell may include an insulating polymer resin. Specifically, the insulating shell may include a polyvinyl chloride (PVC) resin, a polyethylene (PE) resin, a Teflon resin, a silicone resin, a polyurethane resin, and the like.

The diameter of the conductive wire may be, for example, in the range of 1 mm to 10 mm, in the range of 1 mm to 5 mm, or in the range of 1 mm to 3 mm.

The conductive wire may be wound in the form of a flat coil. Specifically, the planar coil may include a planar spiral coil. In addition, the planar shape of the coil may be an elliptical shape, a polygonal shape, or a polygonal shape with rounded corners, but is not particularly limited.

The outer diameter of the planar coil may be 5 cm to 100 cm, 10 cm to 50 cm, 10 cm to 30 cm, 20 cm to 80 cm, or 50 cm to 100 cm. As a specific example, the planar coil may have an outer diameter of 10 cm to 50 cm.

In addition, the inner diameter of the planar coil may be 0.5 cm to 30 cm, 1 cm to 20 cm, or 2 cm to 15 cm.

The number of turns of the flat coil may be 5 to 50 times, 10 to 30 times, 5 to 30 times, 15 to 50 times, or 20 to 50 times. As a specific example, the flat coil may be formed by winding the conductive wire 10 to 30 times.

In addition, the distance between the conductive wires in the planar coil shape may be 0.1 cm to 1 cm, 0.1 cm to 0.5 cm, or 0.5 cm to 1 cm.

When it is within the preferred planar coil dimension and specification range as described above, it may be suitable for a field requiring large-capacity power transmission, such as an electric vehicle.

The coil unit may be disposed to be spaced apart from the magnetic unit by a predetermined interval. For example, the distance between the coil unit and the magnetic unit may be 0.2 mm or more, 0.5 mm or more, 0.2 mm to 3 mm, or 0.5 mm to 1.5 mm.

When within the preferred plane coil unit dimensions and standard ranges as described above, it may be suitable for a field requiring large-capacity power transmission, such as an electric vehicle.

shield part

The wireless charging device 10 according to the embodiment may further include a shield unit 400 that serves to increase the wireless charging efficiency through electromagnetic wave shielding.

The shield part is disposed on one surface of the coil.

The shield part includes a metal plate, and the material thereof may be aluminum, and other metal or alloy materials having electromagnetic wave shielding ability may be used.

The thickness of the shield portion may be 0.2 mm to 10 mm, 0.5 mm to 5 mm, or 1 mm to 3 mm.

In addition, the area of the shield part may be 200 cm ² or more, 400 cm ² or more, or 600 cm ² or more.

housing

The wireless charging device 10 according to the embodiment may further include a housing 600 accommodating the coil unit 200 , the first magnetic unit 300 , and the second magnetic unit 500 .

In addition, the housing 600 is configured such that components such as the coil unit 200, the shield unit 400, the first magnetic unit 300 and the second magnetic unit 500 are properly arranged and assembled. do. The shape (structure) of the housing may be arbitrarily set according to the components included therein or according to the environment. The material and structure of the housing may adopt the material and structure of a typical housing used in a wireless charging device.

support

The wireless charging device 10 according to the embodiment may further include a support part 100 for supporting the coil part 200 . The material and structure of the support part may adopt a material and structure of a conventional support part used in a wireless charging device. The support part may have a flat plate structure or a structure in which a groove is dug along a coil shape to fix the coil part.

On the other hand, the wireless charging device of the present invention can efficiently reduce heat generated when the coil unit receives wireless power from the outside when performing high-power wireless charging of 3 kW to 22 kW, 4 kW to 20 kW, or 5 kW to 18 kW, and charging Since efficiency can be improved, it can be usefully used for high-power wireless charging.

In particular, the wireless charging device can further improve charging efficiency and heat reduction characteristics by applying a three-dimensional structure to the magnetic part.

The charging efficiency of the wireless charging device according to an embodiment of the present invention may be 85% or more, 88% or more, 89% or more, 90% or more, or 91% or more.

Accordingly, the wireless charging device may be usefully used in an electric vehicle requiring large-capacity power transmission between a transmitter and a receiver.

[transportation]

5 shows a moving means to which a wireless charging device is applied, specifically, an electric vehicle, and may be wirelessly charged in a parking area equipped with a wireless charging system for an electric vehicle by providing a wireless charging device at the lower part.

Referring to FIG. 5 , the electric vehicle 1 according to an embodiment includes the wireless charging device according to the embodiment as a receiver 720 .

The wireless charging device may serve as a receiver of wireless charging of the electric vehicle 1 and receive power from the transmitter 730 of wireless charging.

As such, the moving means includes a wireless charging device, and the wireless charging device includes a coil unit; a first magnetic part disposed on the coil part; a second magnetic part disposed on the first magnetic part; and a shield portion disposed on the second magnetic portion, wherein when the coil portion receives wireless power from the outside, more heat is generated in the second magnetic portion than in the first magnetic portion, included in the moving means The configuration and characteristics of each component of the wireless charging device are as described above.

The moving means may further include a battery receiving power from the wireless charging device. The wireless charging device may receive power wirelessly and transmit it to the battery, and the battery may supply power to a driving system of the electric vehicle. The battery may be charged by power transmitted from the wireless charging device or other additional wired charging devices.

In addition, the moving means may further include a signal transmitter for transmitting information about the charging to the transmitter of the wireless charging system. The information about such charging may be charging efficiency such as charging speed, charging state, and the like.

Example

Example 1: Preparation of a hybrid magnetic part

Step 1: Preparation of the first magnetic part (PMB magnetic part)

42.8 parts by weight of magnetic powder, 15.4 parts by weight of polyurethane-based resin dispersion (polyurethane-based resin 25% by weight, 2-butanone 75% by weight), 1.0 parts by weight of isocyanate-based curing agent dispersion (isocyanate-based curing agent 62% by weight, n-butyl acetate 25 wt%, 2-butanone 13% by weight), 0.4 parts by weight of an epoxy resin dispersion (epoxy-based resin 70% by weight, n-butyl acetate 3% by weight, 2-butanone 15% by weight, toluene 12% by weight), and 40.5 parts by weight of toluene was mixed in a planetary mixer at a speed of about 40 to 50 rpm for about 2 hours to prepare a magnetic powder slurry.

The previously prepared magnetic powder slurry was coated on a carrier film by a comma coater, and dried at a temperature of about 110° C. to form a dry magnetic composite. The dried magnetic composite was compression-hardened by a hot press process at a temperature of about 170° C. and a pressure of about 9 Mpa for about 60 minutes to obtain a sheet-type magnetic composite. The magnetic powder content of the magnetic composite thus prepared was about 90%, and the thickness of one sheet was about 100 μm. For the sheet, 40 to 50 sheets were stacked to obtain a first magnetic part having a thickness of about 10.4 mm.

Step 2: Fabrication of a hybrid magnetic part

A hybrid ruler in which a nanocrystalline magnetic material (manufactured by Hitachi, 0.1 mm thick) was disposed on one surface of the first magnetic part (thickness 10.4 mm) prepared in Example 1 and then fixed by thermocompression bonding. A voice part (thickness 10.5 mm) was obtained.

Step 3: Manufacturing of a wireless charging device

As shown in FIG. 2a by using the hybrid magnetic part of step 2, a wireless charging device including a coil part including a conductive wire, the hybrid magnetic part and a shield part was obtained. At this time, the second magnetic part was disposed to face the shield part.

Example 2

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 10 mm and 0.5 mm, respectively, in the same manner as in Example 1, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 3

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 9.5 mm and 1 mm, respectively, in the same manner as in Example 1, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 4

As shown in Table 1 below, the thickness of the first magnetic part is adjusted to 9.5 mm, and a ferritic magnetic material having a thickness of 1 mm (PC-95 ferritic magnetic material manufactured by TDK Corporation) is disposed on one surface of the first magnetic part except that Then, in the same manner as in Example 1, a hybrid magnetic unit and a wireless charging device including the same were obtained.

Example 5

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 7.5 mm and 3 mm, respectively, in the same manner as in Example 4, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 6

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 4.9 mm and 0.1 mm, respectively, in the same manner as in Example 1, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 7

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 4.5 mm and 0.5 mm, respectively, in the same manner as in Example 1, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 8

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 4 mm and 1 mm, respectively, in the same manner as in Example 1, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 9

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 4 mm and 1 mm, respectively, in the same manner as in Example 4, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 10

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 3 mm and 2 mm, respectively, in the same manner as in Example 4, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 11

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 2 mm and 3 mm, respectively, in the same manner as in Example 4, a hybrid magnetic part and a wireless device including the same I got a charging device.

Example 12

As shown in Table 1 below, except that the thickness of the first magnetic part and the thickness of the second magnetic part were adjusted to 4.96 mm and 0.04 mm, respectively, in the same manner as in Example 4, a hybrid magnetic part and a wireless device including the same I got a charging device.

Comparative Example 1: Nanocrystalline magnetic material

As shown in Table 1 below, as a magnetic part, a wireless charging device was obtained using SKC's nanocrystalline magnetic material (thickness 10.5 mm).

Comparative Example 2: First magnetic part (PMB magnetic part)

As shown in Table 1 below, a wireless charging device was obtained using only the first magnetic part (PMB magnetic part, thickness 10.5 mm) obtained in Step 1 of Example 1 as a magnetic part.

Comparative Example 3: Ferritic magnetic material

As shown in Table 1 below, a wireless charging device was obtained using TDK's PC-95 ferritic magnetic material (thickness 10.5 mm) as a magnetic part.

Comparative Example 4: Nanocrystalline magnetic material

As shown in Table 1 below, as a magnetic part, a wireless charging device was obtained using SKC's nanocrystalline magnetic material (thickness 5 mm).

Comparative Example 5: Ferritic magnetic material

As shown in Table 1 below, a wireless charging device was obtained using TDK's PC-95 ferritic magnetic material (thickness 5 mm) as a magnetic part.

test example

(One) Composite Permeability Measurement

The compound magnetic permeability (CP) expressed by Equation 1 below was calculated by using the thickness and permeability of the first magnetic portion and the second magnetic portion used in Examples and Comparative Examples. The results are shown in Table 1 below.

[Equation 1]

Here, P1 is the magnetic permeability of the first magnetic part,

Wherein P2 is the magnetic permeability of the second magnetic part,

T1 is a thickness of a region corresponding to the coil unit in the first magnetic unit,

T2 is a thickness of a region corresponding to the coil unit in the second magnetic unit,

wherein a is 1 when the P1 is 10 or more and 1,000 or less, or 10 when the P1 is more than 1,000 to 8,000 or less, or 20 when the P1 is more than 8,000 to 30,000 or less,

b is 1 when P2 is 10 or more and 1,000 or less, 10 when P2 is 1,000 or more and 8,000 or less, or 20 when P2 is 8000 or more and 30,000 or less.

(2) Charging Efficiency Measurement

Charging efficiency was measured by SAE J2954 WPT2 Z2 Class standard TEST method. Specifically, the receiving pad (35 cm X 35 cm) and the transmitting pad (75 cm X 60 cm ), and the charging efficiency was evaluated for 10 minutes under the same conditions with an output power of 6.6 kW at a frequency of 85 kHz.

(3) fever test

The heat generation of the magnetic part was measured using T/GUARD 405-SYSTEM from Qualitrol.

- Temperature above room temperature and below 100 ℃ : Pass

- Temperature over 100 ℃ to 200 ℃ or less: Fail

The measurement results are summarized in Table 1 below.

As shown in Table 1, the wireless charging device of Examples 1 to 12 using two or more hybrid magnetic parts having different magnetic permeability as the magnetic part is the first magnetic part or the second magnetic part of Comparative Examples 1 to 5 using only the second magnetic part. Compared to the wireless charging device, it is possible to improve the wireless charging efficiency by effectively distributing the magnetic flux density and heat emission, and the heat test result was excellent.

In addition, the wireless charging device of Examples 1 to 12 by adjusting the thickness and permeability of the first magnetic part and the second magnetic part, the composite magnetic permeability (CP) in the magnetic part satisfies 10-290, in this case high-power wireless charging It was possible to further improve the charging efficiency and heat reduction characteristics.

In particular, it was confirmed that the charging efficiency can be further improved by adjusting the thickness ratio of the first magnetic part and the second magnetic part, and when the thickness ratio and permeability thereof have appropriate values, the charging efficiency and the effect of reducing heat generation are maximized. .

Specifically, as in Examples 1 to 3, even if the first magnetic portion and the second magnetic portion each have the same magnetic permeability, the compound magnetic permeability (CP) can be changed in the magnetic portion by adjusting their thickness ratio, and thus It can be seen that the charging efficiency changes accordingly.

On the other hand, in the case of the wireless charging device of Comparative Examples 1 to 5 using only the first magnetic part or the second magnetic part, most of the initial efficiency was lower than that of Examples 1 to 12, and the heat test result was not as good as more than 100 ° C. was confirmed.

Therefore, Examples 1 and 12 can improve charging efficiency and heat reduction characteristics in an efficient way.

1: means of transportation (electric vehicle)
10, 10a, 10b, 10c, 10d, 10e: wireless charging device
100: support part 200: coil part
300: first magnetic part 310: outer part
320: center 400: shield unit
500: second magnetic part 600: housing
700: spacer part 750: spacer insertion part
701: raw material composition 702: injection molding machine
703 : mold
720: receiver 730: transmitter
T1: thickness of a region corresponding to the coil unit in the first magnetic unit
T2: thickness of a region corresponding to the coil unit in the second magnetic unit
A-A': incision line
B-B': incision line

Claims (8)

coil unit; and
and a magnetic part disposed on the coil part;
the magnetic part
a first magnetic part disposed on the coil part; and
and a second magnetic part disposed adjacent to the first magnetic part and having a magnetic permeability different from that of the first magnetic part,
In the magnetic part, the compound magnetic permeability (CP) represented by the following formula 1 is 101 to 290, the wireless charging device:
[Equation 1]

Here, P1 is the magnetic permeability of the first magnetic part,
Wherein P2 is the magnetic permeability of the second magnetic part,
T1 is a thickness of a region corresponding to the coil unit in the first magnetic unit,
T2 is a thickness of a region corresponding to the coil unit in the second magnetic unit,
wherein a is 1 when the P1 is 10 or more and 1,000 or less, or 10 when the P1 is more than 1,000 to 8,000 or less, or 20 when the P1 is more than 8,000 to 30,000 or less,
b is 1 when P2 is 10 or more and 1,000 or less, 10 when P2 is 1,000 or more and 8,000 or less, or 20 when P2 is 8000 or more and 30,000 or less.
The method of claim 1,
The first magnetic part includes a polymer-type magnetic block (PMB) including a binder resin and magnetic powder dispersed in the binder resin,
The second magnetic unit includes a ferritic magnetic material, a nanocrystalline magnetic material, or a combination thereof, wireless charging device.
delete The method of claim 1,
The P1 is 50 to 200, the P2 is 2,000 to 5,000, the T1 is 1mm to 10mm, and the T2 is 0.04mm to 5mm, the wireless charging device.
The method of claim 1,
The P1 is 50 to 200, the P2 is 12,000 to 18,000, the T1 is 1mm to 11mm, the T2 is 0.02mm to 3mm, the wireless charging device.
The method of claim 1,
The magnetic permeability of the second magnetic part is greater than the magnetic permeability of the first magnetic part,
A thickness of a region corresponding to the coil unit in the first magnetic unit is greater than a thickness of an area corresponding to the coil unit in the second magnetic unit, the wireless charging device.
The method of claim 1,
Further comprising a shield portion disposed on the magnetic portion,
The second magnetic part is disposed between the shield part and the first magnetic part,
The second magnetic part is thermally connected to the shield part and electrically insulated, a wireless charging device.
including a wireless charging device;
The wireless charging device,
coil unit; and
and a magnetic part disposed on the coil part;
the magnetic part
a first magnetic part disposed on the coil part; and
and a second magnetic part disposed adjacent to the first magnetic part and having a magnetic permeability different from that of the first magnetic part,
In the magnetic part, the compound magnetic permeability (CP) represented by the following formula 1 is 101 to 290, moving means:
[Equation 1]

Here, P1 is the magnetic permeability of the first magnetic part,
Wherein P2 is the magnetic permeability of the second magnetic part,
T1 is a thickness of a region corresponding to the coil unit in the first magnetic unit,
T2 is a thickness of a region corresponding to the coil unit in the second magnetic unit,
wherein a is 1 when the P1 is 10 or more and 1,000 or less, or 10 when the P1 is more than 1,000 to 8,000 or less, or 20 when the P1 is more than 8,000 to 30,000 or less,
b is 1 when P2 is 10 or more and 1,000 or less, 10 when P2 is 1,000 or more and 8,000 or less, or 20 when P2 is 8000 or more and 30,000 or less.

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