KR102214293B1 - Wireless charging pad, wireless charging device, and electric vehicle comprising same - Google Patents

Abstract

According to an embodiment of the present invention, provided is a wireless charging pad which comprises a thermal conductive unit disposed inside a magnetic material, thereby improving heat dissipation and charging efficiency. Accordingly, the wireless charging pad and a wireless charging device using a structure thereof can be usefully used in electric vehicles which require large-capacity power transmission between a transmitter and a receiver.

Description

Wireless charging pad, wireless charging device, and electric vehicle including the same {WIRELESS CHARGING PAD, WIRELESS CHARGING DEVICE, AND ELECTRIC VEHICLE COMPRISING SAME}

The embodiment relates to a wireless charging pad, a wireless charging device, and an electric vehicle including the same. More specifically, the embodiment relates to a wireless charging pad, a wireless charging device, and an electric vehicle including the same, with improved charging efficiency by including a thermally conductive part in a magnetic material.

Today, the field of information and communication is developing at a very fast pace, and various technologies in which electricity, electronics, communication, semiconductors, etc. are comprehensively combined are continuously being developed. In addition, as electronic devices become more mobile, researches on wireless communication and wireless power transmission technologies are being actively conducted in the communication field. In particular, research on a method of wirelessly transmitting power to electronic devices and the like is actively being conducted.

In the wireless power transmission, power is wirelessly transmitted through space using electromagnetic field resonance structures such as inductive coupling, capacitive coupling, or an antenna without physical contact between a transmitter supplying power and a receiver receiving power. To transfer. The wireless power transmission is suitable for portable communication devices, electric vehicles, etc. that require a large-capacity battery, and since the contact point is not exposed, there is little risk of a short circuit, and a wired charging failure phenomenon can be prevented.

Meanwhile, as interest in electric vehicles has recently increased, interest in building charging infrastructure has been increasing. Various charging methods such as battery replacement, rapid charging device, and wireless charging device have already appeared, including charging electric vehicles using household chargers, and a new charging business business model has also begun to appear (see Korean Patent Laid-Open No. 2011-0042403). In addition, in Europe, electric vehicles and charging stations in test operation have begun to stand out, and in Japan, electric vehicles and charging stations are being piloted, led by automobile manufacturers and power companies.

Korean Patent Application Publication No. 2011-0042403

In the conventional wireless charging pad 500 used in an electric vehicle, with reference to FIG. 5, a magnetic material 520 is disposed adjacent to the coil 510 to improve wireless charging efficiency, and a shield part 530 for shielding. ) Is disposed to be spaced apart from the magnetic material 520 by a predetermined distance.

The wireless charging pad generates heat during the wireless charging operation due to the resistance of the coil and the magnetic loss of the magnetic material. In particular, the magnetic material in the wireless charging pad generates heat near the coil with high electromagnetic energy density, and the generated heat changes the magnetic properties of the magnetic material, causing impedance mismatch between the transmitting pad and the receiving pad, reducing charging efficiency. There was a problem that the fever became worse again due to this. However, since such a wireless charging pad is installed in the lower part of an electric vehicle, it is difficult to implement a heat dissipation structure because it employs a sealed structure for dustproof, waterproof and shock absorption.

Accordingly, as a result of research by the present inventors, it was found that heat dissipation and charging efficiency can be improved by including a thermally conductive part disposed inside a magnetic material used for a wireless charging pad.

Accordingly, an object of the implementation is to provide a wireless charging pad, a wireless charging device, and an electric vehicle including the same, with improved heat dissipation and charging efficiency.

According to one embodiment, a coil including a conductive wire; A shield part disposed on one surface of the coil; A magnetic material disposed between the coil and the shield part; And a thermally conductive part disposed inside the magnetic material.

According to another embodiment, a housing; A coil disposed within the housing and including a conductive wire; A shield part disposed on one surface of the coil in the housing; A magnetic material disposed between the coil and the shield part; And a thermally conductive part disposed inside the magnetic material.

According to another embodiment, an electric vehicle including a wireless charging device, wherein the wireless charging device is disposed in the housing and includes a coil including a conductive wire; A shield part disposed on one surface of the coil in the housing; A magnetic material disposed between the coil and the shield part; And a thermally conductive part disposed inside the magnetic material.

According to the above embodiment, since the wireless charging pad of the present invention includes a thermally conductive part inside the magnetic material, heat generated in the magnetic material can be easily discharged to improve heat dissipation and charging efficiency.

Accordingly, the wireless charging pad and the wireless charging device employing the structure thereof can be usefully used in an electric vehicle that requires a large amount of power transmission between a transmitter and a receiver.

1 shows a configuration diagram of a wireless charging pad according to an embodiment.
2A to 2D are top views of magnetic materials including various types of thermally conductive parts according to an embodiment.
3A to 3C are cross-sectional views of various types of wireless charging devices according to embodiments.
4 shows a process of forming a magnetic material through a mold according to an embodiment.
5 shows a configuration diagram of a conventional wireless charging pad.
6 is a diagram illustrating an application example of a wireless charging device according to an embodiment.
7 illustrates an electric vehicle including a wireless charging device according to an embodiment.

In the description of the following embodiments, it is described that one component is formed above or below another component, in which one component is directly above or below the other component, or indirectly through another component. It includes all that are formed by

In addition, standards for the top/bottom of each component will be described based on the drawings. The size of each component in the drawings may be exaggerated for description and may be different from the size actually applied.

In the present specification, "including" a certain component means that other components are not excluded, but other components may be further included, unless specifically stated to the contrary.

In addition, all numerical ranges representing physical property values, dimensions, and the like of components described in the present specification are to be understood as being modified by the term "about" in all cases unless otherwise specified.

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

[Wireless charging pad]

1 shows a configuration diagram of a wireless charging pad according to an embodiment.

Referring to FIG. 1, a wireless charging pad 100 according to an embodiment includes a coil 110 including a conductive wire; A shield part 130 disposed on one surface of the coil 110; A magnetic material 120 disposed between the coil 110 and the shield unit 130; And a thermally conductive part 190 disposed inside the magnetic material 120. According to one embodiment of the present invention, the wireless charging pad includes a thermally conductive part disposed inside the magnetic material used for the wireless charging pad, thereby easily dissipating heat generated in the magnetic material to improve heat dissipation and charging efficiency. I can make it.

Specifically, the thermally conductive part 190 includes a mesh sheet having a mesh structure, a ribbon sheet 140, or a thermally conductive sheet including a plurality of holes. According to an embodiment of the present invention, a mesh sheet having a mesh structure, a ribbon sheet, or a thermally conductive sheet including a plurality of holes, which is a structure that is open to allow a magnetic field to pass inside a magnetic material used for a wireless charging pad By including the thermally conductive portion including, it is possible to easily discharge heat generated in the magnetic material, it is possible to further improve the charging efficiency.

In particular, when the thermally conductive portion having high thermal conductivity is directly connected to the shield portion or directly or indirectly connected to an external cooler, the temperature inside the magnetic material can be effectively reduced, and further, the thermally conductive portion may have a network structure or a hole. By including a sheet having an open structure, it is possible to maximize the heating effect of the wireless charging pad.

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

Support plate

The wireless charging pad 100 may further include a support plate 170 supporting the coil 110.

The material and structure of the support plate may be a material and structure of a conventional support plate used for a wireless charging pad.

The support plate may have a flat plate structure or a structure in which grooves are formed along a coil shape to fix the coil.

coil

The coil includes 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 at least one metal 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 outer shell may include an insulating polymer resin. Specifically, the insulating outer shell may include polyvinyl chloride (PVC) resin, polyethylene (PE) resin, Teflon resin, silicone resin, polyurethane resin, and the like.

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

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

The outer diameter of the flat 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 flat coil may be 0.5 cm to 30 cm, 1 cm to 20 cm, or 2 cm to 15 cm.

The number of windings 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 planar coil may be formed by winding the conductive wire 10 to 30 times.

In addition, the spacing 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 within the above-described desirable plane coil dimensions and specifications, it may be suitable for fields requiring large-capacity power transmission, such as an electric vehicle.

Shield part

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

The shield unit serves to increase wireless charging efficiency through electromagnetic wave shielding.

The shield part includes a metal plate, and the material thereof may be aluminum, and other metal or alloy material 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, an area of the shield part may be 200 cm ² or more, 400 cm ² or more, or 600 cm ² or more.

Magnetic material

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

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

In addition, the magnetic material may be disposed to be spaced apart from the coil by a predetermined distance. For example, the separation distance between the magnetic material and the coil 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.

The magnetic material may be a polymer-type magnetic material including a binder resin and magnetic powder.

Alternatively, the magnetic material may include a metallic magnetic material, for example, a nanocrystalline magnetic material.

Alternatively, the magnetic material may be a composite material of the polymer magnetic material and the nanocrystalline magnetic material.

High molecular type magnetic material

The magnetic material may include a binder resin and magnetic powder dispersed in the binder resin.

Accordingly, in the polymer-type magnetic material, magnetic powders are bonded to each other by a binder resin, so that defects may be reduced over a large area and damage due to impact may be reduced.

The magnetic powder may be an oxide magnetic powder such as ferrite (Ni-Zn-based, Mg-Zn-based, Mn-Zn-based ferrite, etc.); Metallic magnetic powder such as permalloy, sanddust, and nanocrystalline magnetic material; Or it may be a mixture of these powders. More specifically, the magnetic powder may be sanddust particles having an Fe-Si-Al alloy composition.

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

In the above formula, 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 high molecular weight magnetic material may contain the magnetic powder in an amount of 50% by weight or more, 70% by weight or more, or 85% by weight or more.

For example, the polymeric magnetic material contains 50% to 99% by weight, 70% to 95% by weight, 70% to 90% by weight, 75% to 90% by weight, 75% by weight of the magnetic powder. It may be included in an amount of 95% by weight, 80% by weight to 95% by weight, or 80% by weight to 90% by weight.

The binder resin may be a curable or thermoplastic resin. Specifically, the binder resin may include a photocurable resin, a thermosetting resin, and/or a high heat-resistant thermoplastic resin.

The curable resin includes at least one functional group or moiety capable of curing by heat such as a glycidyl group, an isocyanate group, a hydroxy group, a carboxyl group, or an amide group; Or it contains one or more functional groups or moieties 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. You can use the resin. Such a functional group or moiety may be, for example, an isocyanate group (-NCO), a hydroxy group (-OH), or a carboxyl group (-COOH).

Specifically, the curable resin may be a polyurethane resin, an acrylic resin, a polyester resin, an isocyanate resin, or an epoxy resin having at least one or more functional groups or portions as described above, but is not limited thereto.

As an example, the binder resin may include a polyurethane-based resin, an isocyanate-based curing agent, and an epoxy-based resin.

In addition, the magnetic material is, based on its weight, as the binder resin, 6% to 12% by weight of a polyurethane-based resin, 0.5% to 2% by weight of an isocyanate-based curing agent, and 0.3% to 1.5% by weight of It may contain an epoxy resin.

In addition, the binder resin may be a thermoplastic resin. The thermoplastic resin is, for example, polyimide, polyamide, polycarbonate, acrylonitrile-butadiene-styrene copolymer (ABS, acrylonitrile butadiene styrene copolymer), polypropylene, polyethylene, polystyrene, polyethylene terephthalate, One selected from the group consisting of polybutylene terephthalate, polyphenyl sulfide, polyether ether ketone, or a combination thereof is possible.

The magnetic material 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, the high molecular weight magnetic material, based on its weight, as the binder resin, 6% to 12% by weight of a polyurethane-based resin, 0.5% to 2% by weight of an isocyanate-based curing agent, and 0.3% to 1.5% by weight % Of the epoxy resin.

Nanocrystalline magnetic material

The magnetic material may include a nanocrystalline magnetic material.

When the nanocrystalline magnetic material is applied, even if the inductance (Ls) of the coil decreases as the distance from the coil increases, the resistance (Rs) decreases further, thereby increasing the quality factor (Q factor: Ls/Rs) of the coil and charging. Efficiency can be improved and heat generation can be reduced.

For example, the nanocrystalline magnetic material may be an Fe-based nanocrystalline magnetic material, specifically, a Fe-Si-Al-based nanocrystalline magnetic material, a Fe-Si-Cr-based nanocrystalline magnetic material, or a Fe-Si-B It may be a Cu-Nb-based nanocrystalline magnetic material.

More specifically, the nanocrystalline magnetic material may be a Fe-Si-B-Cu-Nb-based nanocrystalline magnetic material, in which case, Fe is 70% to 85%, and the sum of Si and B is 10% To 29 element%, and the sum of Cu and Nb is preferably 1 element% to 5 element% (here, the element% means the percentage of the number of specific elements relative to the total number of elements constituting the magnetic material). Within the above composition range, the Fe-Si-B-Cu-Nb-based alloy can be easily formed into nano-phase crystalline by heat treatment.

The nanocrystalline magnetic material is prepared by, for example, a rapid cooling and solidification method (RSP) by melt spinning of an Fe-based alloy, and no magnetic field for 30 minutes to 2 hours at a temperature range of 300° C. to 700° C. to obtain a desired magnetic permeability. It can be manufactured by performing heat treatment.

If the heat treatment temperature is less than 300° C., nanocrystals are not sufficiently generated, so that the desired permeability cannot be obtained, and the heat treatment time may take a long time. If the heat treatment temperature exceeds 700° C., the permeability may be significantly lowered by superheat treatment. In addition, if the heat treatment temperature is low, it takes a long treatment time, and if the heat treatment temperature is high, the treatment time is preferably shortened.

Nanocrystalline magnetic material is difficult to make a thick thickness in the manufacturing process, for example, may be formed to a thickness of 15 ㎛ to 35 ㎛.

Method of manufacturing magnetic material

The magnetic material, specifically, a polymer-type magnetic material, may be prepared by mixing a magnetic powder and a thermosetting polymer resin composition into a slurry, forming a sheet, and curing it into a sheet.

In addition, in order to manufacture a large-area magnetic material with a certain thickness using a thermoplastic resin, it can be formed into a three-dimensional structure by a mold. Specifically, a magnetic powder and a thermoplastic resin are kneaded using mechanical shear force and heat, It can be pelletized using an apparatus to manufacture a block by injection molding.

A conventional sheeting or blocking method may be applied to the manufacturing method.

The magnetic material may be elongated at a certain rate. For example, the elongation rate of the magnetic material may be 0.5% or more. The elongation property is difficult to obtain in a ceramic-based magnetic material that does not apply a polymer, and damage can be reduced even if a large-area magnetic material is distorted due to impact. Specifically, the elongation rate of the magnetic material 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. However, when the content of the polymer resin is increased to improve the elongation rate, physical properties such as inductance of the magnetic material may be degraded, so the elongation rate is preferably set to 10% or less.

The molding may be performed by injecting a raw material of a magnetic material into a mold by injection molding. More specifically, the magnetic material is obtained by mixing a magnetic powder and a polymer resin composition to obtain a raw material composition, and then, as shown in FIG. 4, the raw material composition 401 is injected into the mold 403 by an injection molding machine 402 Can be manufactured. At this time, by designing the inner shape of the mold 403 in a three-dimensional structure, it is possible to easily implement a three-dimensional structure of a magnetic material. Such a process is impossible when the conventional sintered ferrite sheet is used as a magnetic material.

Area and thickness of magnetic material

The magnetic material may be a magnetic sheet, a magnetic sheet stack, or a magnetic block.

The magnetic material may have a large area, and specifically, may have an area of 200 cm ² or more, 400 cm ² or more, or 600 cm ² or more. In addition, the magnetic material may have an area of 10,000 cm ² or less.

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

The thickness of the magnetic sheet may be 15 µm or more, 50 µm or more, 80 µm or more, 15 µm to 150 µm, 15 µm to 35 µm, or 85 µm to 150 µm. Such a magnetic sheet may be manufactured by a method of manufacturing a conventional film or sheet.

The stacked body of the magnetic sheet may include 20 or more magnetic sheets, or 50 or more stacked magnetic sheets. In addition, the stacked body of the magnetic sheet may be a stack of 150 or less, or 100 or less magnetic sheets.

The thickness of the magnetic block may be 1 mm or more, 2 mm or more, 3 mm or more, or 4 mm or more. In addition, the thickness of the magnetic block may be 6 mm or less.

Magnetic properties of magnetic materials

The magnetic material may have a certain level of magnetic properties in the vicinity of a standard frequency for wireless charging of an electric vehicle.

The standard frequency of wireless charging of the electric vehicle may be less than 100 kHz, specifically 79 kHz to 90 kHz, specifically 81 kHz to 90 kHz, and more specifically about 85 kHz, which is applied to mobile electronic devices such as mobile phones. It is a band that is distinguished from the frequency.

For example, the magnetic permeability of the magnetic material may be 5 to 150,000, 10 to 150,000, 20 to 150,000, 5 to 300, 30 to 300, 600 to 3,500, or 10,000 to 150,000 in a frequency band of 79 kHz to 90 kHz. . Specifically, the magnetic permeability of the magnetic material may be 30 to 300, 600 to 3,500, or 10,000 to 150,000 in a frequency band of 79 kHz to 90 kHz. More specifically, the magnetic permeability of the magnetic material may be 30 to 250, or 30 to 200 in the frequency band of 79 kHz to 90 kHz.

In addition, the investment loss of the magnetic material may be 1 to 150,000, 1 to 50,000, 5 to 30,000, 10 to 3,000, 10 to 1,000, 100 to 1,000, or 5,000 to 50,000 in a frequency band of 79 kHz to 90 kHz.

Specifically, the magnetic material may have a magnetic permeability of 30 to 200 and an investment loss of 10 to 3,000 in a frequency band of 79 kHz to 90 kHz.

Physical properties of magnetic materials

The polymeric magnetic material may be elongated at a predetermined ratio. For example, the elongation rate of the polymer magnetic material may be 0.5% or more. The elongation property is difficult to obtain in a ceramic-based magnetic material that does not apply a polymer, and damage can be reduced even if a large-area magnetic material is warped due to impact. Specifically, the elongation rate of the polymer magnetic material 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. However, when the content of the polymer resin is increased to improve the elongation rate, physical properties such as inductance of the magnetic material may be degraded, so the elongation rate is preferably set to 10% or less.

The magnetic material has a small rate of change of physical properties before and after impact, and is superior to general ferrite magnetic sheets.

In the present specification, the rate of change (%) of a property before and after impact of a property can be calculated by the following equation.

Characteristic change rate (%) = | Characteristic value before impact-Characteristic value after impact | / Characteristic value before impact x 100

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

In addition, the magnetic material may have a rate of change of a quality factor (Q factor) before and after the impact applied by free fall from a height of 1 m from 0% to 5%, from 0.001% to 4%, or from 0.01% to 2.5%. When within the above range, there is little change in physical properties before and after impact, so that the stability and impact resistance of the magnetic material may be more improved.

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

In addition, the magnetic material may have a rate of change of charging efficiency before and after the impact applied by free fall from a height of 1 m from 0% to 6.8%, from 0.001% to 5.8%, or from 0.01% to 3.4%. When within the above range, physical properties may be more stably maintained even if the large-area magnetic material repeatedly experiences impact or distortion.

Thermal conductive part

The wireless charging pad according to the embodiment includes a thermally conductive portion disposed inside the magnetic material, and the thermally conductive portion includes a mesh sheet having a mesh structure, a ribbon sheet, or a thermally conductive sheet including a plurality of holes.

2A to 2D are top views of magnetic materials 220, 220a, 220b, 220c, 220d including various types of thermally conductive parts according to embodiments.

Specifically, FIG. 2A is a top view of a magnetic material 220, 220a including a ribbon sheet 240, and FIG. 2B is a top surface of a magnetic material 220', 220b including a mesh sheet 250 having a mesh structure. 2C and 2D are top views of magnetic materials 220c and 220d including thermally conductive sheets 270 and 270 ′ including a plurality of holes 260 and 260 ′.

According to an embodiment of the present invention, the thermally conductive portion is not in the form of a substrate such as a metal plate, but is a structure that is open so that a magnetic field can travel, and includes a mesh sheet, a ribbon sheet or a thermally conductive sheet including a plurality of holes The mesh sheet, the ribbon sheet, or the thermally conductive sheet is a material having high thermal conductivity, and thus heat generated inside the magnetic material can be effectively discharged to the outside.

Referring to FIG. 2A, the ribbon sheet may include at least two or more spaced apart at a predetermined interval. Since the two or more ribbon sheets are spaced apart from each other, a magnetic field can be smoothly circulated inside the magnetic material, and by including a ribbon made of a material having high thermal conductivity, heat inside the magnetic material can be effectively discharged.

The width of the ribbon sheet is not particularly limited as long as the effect of the present invention is not impaired, for example, 5 mm to 10 mm, 5 mm to 9 mm, 5 mm to 8 mm, 5 mm to 7.5 mm, Alternatively, it may have a width of 8 mm to 10 mm. If the width of the ribbon sheet exceeds 10 mm, the magnetic field is obstructed to circulate and the charging efficiency may decrease.If the width of the ribbon sheet is less than 5 mm, the heat dissipation effect inside the magnetic material decreases Can be.

Meanwhile, with reference to FIGS. 2B to 2D, the mesh sheet or the thermally conductive sheet may include an opening (hole) having an open structure through which a magnetic field can be smoothly smoothed inside a magnetic material.

According to an embodiment of the present invention, the mesh sheet or the thermally conductive sheet may have an opening (hole) area of 15% to 30% of the total area of the magnetic material. Specifically, the mesh sheet or the thermally conductive sheet may have an opening (hole) area of 18% to 25% of the total area of the magnetic material. When within the above range, the magnetic field flow in the magnetic material may be more advantageous.

The mesh sheet or the thermally conductive sheet may include a hole having an inner diameter of 500 µm to 1500 µm, specifically 700 µm to 1200 µm, and more specifically 800 µm to 1000 µm. When the mesh sheet or the thermally conductive sheet includes a hole having an inner diameter within the above range, the charging efficiency and heat dissipation characteristics desired in the present invention may be further improved.

The type of ribbon sheet, mesh sheet, or thermally conductive sheet included in the thermally conductive part can be used without limitation, as long as the desired effect of the present invention is achieved, and specifically composed of aluminum, copper, silver and gold, which are thermally conductive materials. It may include a metal material including at least one selected from the group.

The thermally conductive part may have sufficient thermal conductivity to transfer heat inside the magnetic material. Specifically, the thermal conductivity of the thermally conductive part is 230 W/mK to 430 W/mK, 237 W/mK to 429 W/mK, 237 W/mK to 401 W/mK, 230 W/mK to 300 W/mK, or 301 W/mK to 430 W/mK.

The thermally conductive part is 24 J/mol·K to 25.5 J/mol·K, 24.2 J/mol·K to 25.3 J/mol·K, 24.5 J/mol·K to 25.5 J/mol·K, or 24 J/ It may have a heat capacity of mol·K to 24.5 J/mol·K.

The thickness ratio of the thermally conductive part and the magnetic material may be 1: 10 to 250, 1: 20 to 200, 1: 25 to 100, 1: 50 to 150, or 1: 10 to 80.

In addition, the area ratio of the thermally conductive part and the magnetic material may be 1: 2.3 to 5.5, 1: 3 to 4.5, 1: 2.3 to 3.5, or 1: 3.5 to 5.5.

Meanwhile, according to an embodiment of the present invention, as shown in FIGS. 3B and 3C, the thermally conductive part 390 includes an extension part 340 ′ further extending in the longitudinal direction from at least one end of the magnetic material 320. can do. 3B and 3C illustrate a case in which a ribbon sheet is included in the magnetic material as an example of the present invention. However, as described above, the thermally conductive part includes a mesh sheet having a mesh structure or a plurality of holes instead of the ribbon sheet. It may be replaced to include a containing thermally conductive sheet.

In addition, as shown in FIGS. 3B and 3C, a thermally conductive portion, specifically a ribbon sheet 340, a mesh sheet, or a thermally conductive sheet, is directly connected to the shield portion 330 or directly or indirectly with an external cooler 380. Can be connected. In this case, the cooler may cool the extension part 340 ′ by air cooling or water cooling.

Specifically, as shown in FIG. 3B, the ribbon sheet 340 includes an extension portion 340' further extending in the longitudinal direction from both ends of the magnetic material 320, and the extension portion 340' is a shield portion ( 330) can be directly connected. Furthermore, by connecting the external cooler 380 to the shield part 330, the temperature of the extension part 340 ′ of the ribbon sheet 340 may be effectively reduced. When the ribbon sheet, mesh sheet or thermally conductive sheet included in the thermally conductive part is connected to the shield part or an external cooler, the temperature of the ribbon sheet, mesh sheet, or thermally conductive sheet is reduced by the shield part or an external cooler In this way, the temperature inside the magnetic material can be reduced as well as the temperature of the wireless charging pad, so that the heating effect can be further improved.

In addition, as shown in Fig. 3c, the ribbon sheet 340 includes extensions 340' further extending in the longitudinal direction from both ends of the magnetic material 320, and the cooler 380 is attached to the shield unit 330. It may be connected to or directly connected to the extension part 340'. In addition, the cooler 380 may be directly connected to both the shield part 330 and the extension part 340 ′.

The cooler 380 may be connected to the shield part 330 and/or the extension part 340 ′ while having a sealed structure for waterproof and dustproof. 3A to 3C, the cooler 380 may be connected to the shield part 330 and/or the extension part 340 ′ through a connection passage 395.

Meanwhile, since the region in which heat is mainly generated from the magnetic material is a region corresponding to the coil 310, the thermally conductive part may be disposed corresponding to the region in which the coil is present. In other words, the thermally conductive part may be hardly disposed in the central part of the coil where the density of the conductive wire is small.

In addition, the thermally conductive part may be disposed in a region in which the coil is present, and in other regions, for example, a central part in which the density of the conductive wire is low.

Meanwhile, a structure in which the thermally conductive part is disposed inside the magnetic material may be variously designed.

As an example, a polymer-type magnetic material may be formed through a mold so as to have a thermally conductive part including a mesh sheet, a ribbon sheet, or a thermally conductive sheet including a plurality of holes therein.

As another example, a polymer-type magnetic material may be molded through a mold so as to have an inner space into which the thermally conductive part is inserted, and then the thermally conductive part may be inserted. In this case, the thermally conductive part may be inserted into the polymer-type magnetic material after preparing a thermally conductive material such as a mesh sheet, a ribbon sheet, or a thermally conductive sheet including a plurality of holes.

As another example, by inserting and laminating the thermally conductive portion between a plurality of magnetic sheets, a magnetic sheet laminate in which the thermally conductive portion is inserted may be manufactured.

The thermally conductive part may have a total internal volume of 0.5% to 1% based on the total volume of the magnetic material. When within this range, the magnetic field flow may be more advantageous.

[Wireless charging device]

3A to 3C are cross-sectional views of various structures of wireless charging devices according to embodiments.

Referring to Figures 3a to 3c, the wireless charging device (300a, 300b, 300c) according to an embodiment, the housing 301; A coil 310 disposed in the housing 301 and including a conductive wire; A shield part 330 disposed on one surface of the coil 310 in the housing 301; A magnetic material 320 disposed between the coil 310 and the shield part 330; And a thermally conductive part 390 disposed inside the magnetic material 320. In addition, the thermally conductive part 390 includes a mesh sheet having a network structure, a ribbon sheet, or a thermally conductive sheet including a plurality of holes.

3A to 3C illustrate a case in which a ribbon sheet is included in the magnetic material as an example of the present invention, but as described above, the thermally conductive part has a mesh sheet having a mesh structure or a plurality of holes instead of the ribbon sheet. It may be replaced to include a containing thermally conductive sheet.

Further, the wireless charging devices 300a, 300b, and 300c may further include a cooler 380 disposed outside the housing 301 and directly or indirectly connected to the thermally conductive part 390.

The thermally conductive part 390 includes an extension part 340 ′ further extending in the longitudinal direction from at least one end of the magnetic material 320, and the extension part 340 ′ is directly connected to the shield part 330 Or it may be directly or indirectly connected to the external cooler 380.

Meanwhile, as shown in FIGS. 3A and 3B, since a region in which heat mainly occurs in the magnetic material is a region corresponding to a coil, the thermally conductive part may be disposed corresponding to a region in which the coil is present. In other words, the thermally conductive part may be hardly disposed in the central part of the coil where the density of the conductive wire is small.

In addition, as shown in FIG. 3C, the thermally conductive part may be disposed in a region in which the coil is present, and in other regions, for example, a central part having a low density of a conductive wire.

The housing allows components such as the coil, shield unit, and magnetic material to be properly disposed and assembled. The material and structure of the housing may be a material and structure of a conventional housing used in a wireless charging device.

The wireless charging device according to the embodiment may further include a support plate supporting the coil. The configuration and characteristics of the support plate, coil, shield part, magnetic material, and thermal conductive part of the wireless charging device are as described above.

In addition, the wireless charging device according to the embodiment may further include a spacer for securing a space between the shield unit and the magnetic material. The material and structure of the spacer may be a material and structure of a conventional housing used in a wireless charging device.

The wireless charging device is generated in the magnetic material by including a thermally conductive part including a mesh sheet, a ribbon sheet, or a thermally conductive sheet including a plurality of holes in the interior of the magnetic material used for the wireless charging pad. Heat can be easily released.

Accordingly, the wireless charging pad and the wireless charging device employing the structure thereof can be usefully used in an electric vehicle that requires a large amount of power transmission between a transmitter and a receiver.

[Electric car]

6 shows a wireless charging device applied to an electric vehicle.

The wireless charging device 655 may be provided under the electric vehicle 600.

An electric vehicle according to an embodiment is an electric vehicle including a wireless charging device, wherein the wireless charging device is disposed in the housing and includes a coil including a conductive wire; A shield part disposed on one surface of the coil in the housing; A magnetic material disposed between the coil and the shield part; And a thermally conductive part disposed inside the magnetic material.

In addition, the thermally conductive portion may include a mesh sheet having a network structure, a ribbon sheet, or a thermally conductive sheet including a plurality of holes.

The electric vehicle may further include a cooler disposed outside the housing and directly or indirectly connected to the thermally conductive part.

The configuration and characteristics of each component of the wireless charging device included in the electric vehicle are as described above.

A cooling facility basically provided in the electric vehicle may be used as a cooler of the wireless charging device.

For example, the cooler may include an automobile air conditioner. Specifically, as shown in FIG. 6, the air conditioner provided inside the electric vehicle 600 is used as the cooler 680, and the connection passage connected to the extension part and/or the shield part of the thermal conductive part of the wireless charging device 655 (695) and the air conditioner may be connected. Accordingly, even if a separate cooler is not manufactured, effective heat dissipation may be possible.

The electric vehicle may further include a battery that receives power from the wireless charging device. The wireless charging device may receive power wirelessly and transmit power to the battery, and the battery may supply power to a drive system of the electric vehicle. The battery may be charged by power transmitted from the wireless charging device or other additional wired charging device.

In addition, the electric vehicle may further include a signal transmitter for transmitting information on charging to a transmitter of a wireless charging system for an electric vehicle. Information on such charging may include charging efficiency such as charging speed, charging degree, and the like.

The wireless charging device may be provided under the vehicle.

7 shows an electric vehicle to which a wireless charging device is applied.

The electric vehicle may be wirelessly charged in a parking area equipped with a wireless charging system for an electric vehicle.

Referring to FIG. 6, an electric vehicle 700 according to an embodiment includes a wireless charging device according to the embodiment as a receiver 720.

The wireless charging device serves as a receiver for wireless charging of the electric vehicle 700 and may receive power from the transmitter 730 for wireless charging.

100, 500: wireless charging pad
110, 310, 510: coil
120, 220, 220', 220a, 220b, 220c, 220d, 320, 520: magnetic material
130, 330, 530: shield part
240, 340: ribbon sheet 250: mesh sheet
190, 390: thermally conductive part 270, 270': thermally conductive sheet
170: support plate
260, 260': hole
301: housing
340': extension
300a, 300b, 300c, 655: wireless charging device 380, 680: cooler
395, 695: connecting euros
401: raw material composition 402: injection molding machine 403: mold
600, 700: electric vehicle 720: receiver 730: transmitter

Claims (22)

A coil including a conductive wire;
A shield part disposed on one surface of the coil;
A magnetic material disposed between the coil and the shield part; And
Including a thermally conductive portion disposed inside the magnetic material,
A wireless charging pad comprising a mesh sheet, a ribbon sheet, or a thermally conductive sheet including a plurality of holes in the thermally conductive portion having a network structure.
delete The method of claim 1,
The wireless charging pad, wherein the mesh sheet or the thermally conductive sheet has an opening (hole) area of 15% to 30% of the total area of the magnetic material.
The method of claim 3,
The mesh sheet or the thermally conductive sheet comprises a hole having an inner diameter of 500 ㎛ to 1500 ㎛, wireless charging pad.
The method of claim 1,
The ribbon sheet includes at least two or more spaced at a predetermined interval, and has a width of 5 mm to 10 mm, wireless charging pad.
A coil including a conductive wire;
A shield part disposed on one surface of the coil;
A magnetic material disposed between the coil and the shield part; And
Including a thermally conductive portion disposed inside the magnetic material,
The wireless charging pad, wherein the thermal conductive part has a thermal conductivity of 230 W/mK to 430 W/mK.
A coil including a conductive wire;
A shield part disposed on one surface of the coil;
A magnetic material disposed between the coil and the shield part; And
Including a thermally conductive portion disposed inside the magnetic material,
The wireless charging pad, wherein the thermally conductive portion has a heat capacity of 24 J/mol·K to 25.5 J/mol·K.
A coil including a conductive wire;
A shield part disposed on one surface of the coil;
A magnetic material disposed between the coil and the shield part; And
Including a thermally conductive portion disposed inside the magnetic material,
The thickness ratio of the thermally conductive part and the magnetic material is 1: 10 to 250, the wireless charging pad.
A coil including a conductive wire;
A shield part disposed on one surface of the coil;
A magnetic material disposed between the coil and the shield part; And
Including a thermally conductive portion disposed inside the magnetic material,
The area ratio of the thermally conductive part and the magnetic material is 1: 2.3 to 5.5, the wireless charging pad.
The method according to any one of claims 1 and 6 to 9,
The wireless charging pad, wherein the thermally conductive portion includes an extension portion further extending in a longitudinal direction from at least one end of the magnetic material.
The method of claim 10,
The wireless charging pad, wherein the extension part is directly connected to the shield part or directly or indirectly connected to an external cooler.
The method of claim 11,
The wireless charging pad cooling the extension by the cooler air-cooled or water-cooled.
The method according to any one of claims 1 and 6 to 9,
A wireless charging pad comprising a metal material including at least one selected from the group consisting of aluminum, copper, silver, and gold in the thermally conductive part.
The method according to any one of claims 1 and 6 to 9,
The wireless charging pad, wherein the thermally conductive part is disposed corresponding to a region in which the coil is present.
The method according to any one of claims 1 and 6 to 9,
The magnetic material is formed in a three-dimensional structure by a mold, wireless charging pad.
A wireless charging device comprising a wireless charging pad and a housing including any one of claims 1 and 6 to 9.
delete The method of claim 16,
The wireless charging device further comprises a cooler disposed outside the housing and directly or indirectly connected to the thermally conductive part.
The method of claim 18,
The thermally conductive portion includes an extension portion further extending in the longitudinal direction from at least one end of the magnetic material,
The wireless charging device, wherein the extension part is directly connected to the shield part or directly or indirectly connected to an external cooler.
An electric vehicle comprising the wireless charging device of claim 16.
delete The method of claim 20,
Further comprising a cooler disposed outside the housing and directly or indirectly connected to the thermally conductive part,
The electric vehicle, wherein the cooler comprises an automotive air conditioner.

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