Wireless charging device and vehicle including same

Abstract

According to one embodiment, a wireless charging device can efficiently dissipate heat by including an insulating heat dissipation unit inside the magnetic unit or between the magnetic unit and the coil unit. Therefore, the wireless charging device can be useful in vehicles such as electric vehicles that require large-capacity power transmission between a transmitter and a receiver.

Description

[Technical field]

[0001] The embodiment relates to a wireless charging device and a vehicle including the same. More specifically, the embodiment relates to a wireless charging device and a vehicle including the same, such as an electric vehicle, in which charging efficiency is improved by applying a heat dissipation structure. [Background technology]

[0002] Recently, the information and communications field has been developing at a very fast pace, and various technologies that comprehensively combine electricity, electronics, communications, semiconductors, etc. are continuously developed. In addition, as the trend for electronic devices to become more mobile increases, research on wireless communication and wireless power transmission technologies is being actively conducted in the communications field. In particular, research on methods for wirelessly transmitting power to electronic devices is actively progressing.

[0003] The wireless power transmission wirelessly transmits power through space using inductive coupling, capacitive coupling, or an electromagnetic resonance structure such as an antenna without physical contact between a transmitter that supplies power and a receiver that receives the power. The wireless power transmission is suitable for portable communication devices and electric vehicles that require large-capacity batteries, and since the contacts are not exposed, there is almost no risk of leakage, and it can prevent the charging failure phenomenon that occurs with wired methods.

[0004] Meanwhile, as interest in electric vehicles has recently surged, so has interest in building charging infrastructure. A variety of charging methods have already emerged, including charging electric vehicles using home chargers, battery swapping, rapid charging devices, and wireless charging devices, and new charging business models are also beginning to emerge (see Patent Document 1). In Europe, electric vehicles and charging stations undergoing trial operation are becoming more noticeable, while in Japan, automakers and power companies are taking the lead in experimentally operating electric vehicles and charging stations. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Korean Patent Publication No. 2011-0042403 Summary of the Invention [Problem to be solved by the invention]

[0006] Referring to FIG. 3, in a conventional wireless charging device used in electric vehicles, etc., a magnetic unit 300' is disposed adjacent to a coil unit 200' to improve wireless charging efficiency, and a shield unit 400' for electromagnetic shielding is disposed at a certain distance from the magnetic unit 300'.

[0007] During wireless charging, the wireless charging device generates heat due to the resistance of the coil and the magnetic loss of the magnetic part. In particular, the magnetic part in the wireless charging device generates heat in the area close to the coil where the electromagnetic energy density is high, and the generated heat changes the magnetic properties of the magnetic part, causing impedance mismatch between the transmitter and the receiver, reducing the charging efficiency, and thus increasing the heat generation phenomenon. However, since such a wireless charging device is installed under the electric vehicle, it adopts a sealed structure for dustproofing, waterproofing, and shock absorption, making it difficult to realize a heat dissipation structure.

[0008] As a result of research conducted by the present inventors, it was discovered that heat can be efficiently discharged by providing an insulating heat dissipation section inside the magnetic section or between the magnetic section and the coil section.

[0009] Therefore, an issue to be addressed in the implementation is to provide a wireless charging device and a vehicle including the same that are effective in dissipating heat. [Means for solving the problem]

[0010] According to one implementation example, a wireless charging device is provided that includes a coil portion including a conductive wire, a shield portion arranged on the coil portion, a magnetic portion arranged between the coil portion and the shield portion, and an insulating heat dissipation portion arranged inside the magnetic portion or between the magnetic portion and the coil portion.

[0011] According to another implementation example, there is provided a mobile means including a wireless charging device, the wireless charging device including a housing, a coil portion disposed within the housing and including a conductive wire, a shield portion disposed on the coil portion, a magnetic portion disposed between the coil portion and the shield portion, and an insulating heat dissipation portion disposed inside the magnetic portion or between the magnetic portion and the coil portion. Effect of the Invention

[0012] The wireless charging device according to the above embodiment can efficiently dissipate heat by including a heat dissipation unit near the coil unit or magnetic unit that generates heat.

[0013] Specifically, in the wireless charging device, the heat dissipation unit is disposed between the magnetic unit and the coil unit to simultaneously dissipate heat generated in the magnetic unit and the coil unit, or is disposed inside the magnetic unit to effectively dissipate heat generated inside the magnetic unit, and is connected to the shield unit to efficiently discharge heat to the outside.

[0014] Therefore, the wireless charging device can be usefully used in vehicles such as electric vehicles that require large-capacity power transmission between a transmitter and a receiver. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 shows an exploded perspective view of a wireless charging device according to one implementation. [Figure 2A] FIG. 2A illustrates an example of a cross-sectional view of a wireless charging device. [Figure 2B] FIG. 2B illustrates an example of a cross-sectional view of a wireless charging device. [Figure 2C] FIG. 2C illustrates an example of a cross-sectional view of a wireless charging device. [Diagram 3] FIG. 3 shows an exploded perspective view of a conventional wireless charging device. [Figure 4] FIG. 4 shows an electric vehicle in which a wireless charging device is applied as a receiver. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In the following description of implementation examples, when one component is described as being formed on or under another component, this includes all cases in which the one component is directly formed on or under the other component, or indirectly formed through yet another component.

[0017] In addition, the reference 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 the purpose of explanation and may differ from the size applied in reality.

[0018] In this specification, unless otherwise specified, the term "comprising" a certain component means that it may further include other components, rather than excluding other components.

[0019] In addition, all numerical ranges indicating property values, dimensions, and the like of components described in this specification should be understood to be modified in all cases by the term "about" unless otherwise specified.

[0020] In this specification, the singular expression should be construed as including the singular or plural as the context requires, unless otherwise specified.

[0021] (wireless charging device) FIG. 1 shows an exploded perspective view of a wireless charging device according to one implementation.

[0022] Referring to FIG. 1, a wireless charging device 10 according to one embodiment includes a coil section 200 including a conductive wire, a shield section 400 arranged on the coil section 200, a magnetic section 300 arranged between the coil section 200 and the shield section 400, and an insulating heat dissipation section 500 arranged inside the magnetic section 300 or between the magnetic section 300 and the coil section 200.

[0023] Hereinafter, each component of the wireless charging device will be described in detail.

[0024] [Coil section] The coil portion includes a conductive wire.

[0025] 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.

[0026] The conductive wire may also include an insulating sheath. For example, the insulating sheath may include an insulating polymer resin. Specifically, the insulating sheath may include polyvinyl chloride (PVC) resin, polyethylene (PE) resin, Teflon resin, silicone resin, polyurethane resin, etc.

[0027] The diameter of the conductive wire can 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.

[0028] The conductive wire may be wound in a planar coil shape. Specifically, the planar coil may include a planar spiral coil. The planar shape of the coil may be, but is not limited to, a circle, an ellipse, a polygon, or a polygon with rounded corners.

[0029] 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.

[0030] 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.

[0031] The number of turns of the planar coil may be 5 to 50, 10 to 30, 5 to 30, 15 to 50, or 20 to 50. As a specific example, the planar coil may be formed by winding the conductive wire 10 to 30 times.

[0032] Additionally, within the planar coil shape, the spacing between the conductive wires may be 0.1 cm to 1 cm, 0.1 cm to 0.5 cm, or 0.5 cm to 1 cm.

[0033] When the planar coil is within the preferred dimensions and specifications as described above, it may be suitable for applications requiring large capacity power transmission, such as electric vehicles.

[0034] [Shield part] The shield portion is disposed on the coil portion.

[0035] The shielding portion serves to prevent electromagnetic interference (EMI) that may occur due to electromagnetic waves leaking to the outside.

[0036] The shield portion may be spaced apart from the coil portion by a certain distance, for example, the distance between the shield portion and the coil portion may be 10 mm or more, or 15 mm or more, specifically, 10 mm to 30 mm, or 10 mm to 20 mm.

[0037] The material of the shielding portion may be, for example, a metal, so that the shielding portion may be a metal plate, but is not particularly limited thereto. As a specific example, the material of the shielding portion is aluminum, and other metal or alloy materials having electromagnetic wave shielding properties may be used.

[0038] The thickness of the shielding portion may be 0.2 mm to 10 mm, 0.5 mm to 5 mm, or 1 mm to 3 mm. The area of ​​the shielding portion may be 200 cm2 or less. 2 More than 400cm 2 or more, or 600cm 2 It could be more than that.

[0039] [Magnetic part] The magnetic portion is disposed between the coil portion and the shield portion.

[0040] The magnetic portion may be spaced apart from the shield portion by a certain distance. For example, the distance between the magnetic portion and the shield portion may be 3 mm or more, 5 mm or more, 3 mm to 10 mm, or 4 mm to 7 mm.

[0041] The magnetic portion may be disposed at a constant distance from the coil portion. For example, the distance between the magnetic portion and the coil portion 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.

[0042] The magnetic part may be a polymeric magnetic material including a binder resin and a magnetic powder, or may include a metal-based magnetic material, such as a nanocrystalline magnetic material, or may be a composite of the polymeric magnetic material and the nanocrystalline magnetic material.

[0043] <Polymer magnetic material> The magnetic portion may include a polymeric magnetic material, and more specifically, may include a binder resin and a magnetic powder dispersed in the binder resin.

[0044] As a result, the polymer-type magnetic material has fewer defects overall over a wide area and is less susceptible to damage caused by impact because the magnetic powder is bound to one another by the binder resin.

[0045] The magnetic powder may be an oxide-based magnetic powder such as ferrite (Ni-Zn, Mg-Zn, Mn-Zn ferrite, etc.), a metal-based magnetic powder such as permalloy, sendust, nanocrystalline magnetic material, or a mixture thereof. More specifically, the magnetic powder may be sendust particles having an Fe-Si-Al alloy composition.

[0046] As an example, the magnetic powder may have the composition of Formula 1 below. [C1] Fe 1-a-b-c S a X b Y c In the above formula, X is Al, Cr, Ni, Cu, or a combination thereof, and Y is Mn, B, Co, Mo, or a combination thereof, where 0.01≦a≦0.2, 0.01≦b≦0.1, and 0≦c≦0.05.

[0047] The average particle size of the magnetic powder can 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.

[0048] The polymer-type magnetic body 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.

[0049] For example, the polymer magnetic body may contain the magnetic powder in an amount of 50% by weight to 99% by weight, 70% by weight to 95% by weight, 70% by weight to 90% by weight, 75% by weight to 90% by weight, 75% by weight to 95% by weight, 80% by weight to 95% by weight, or 80% by weight to 90% by weight.

[0050] The binder resin may be a curable resin. Specifically, the binder resin may include a photocurable resin, a thermosetting resin, and / or a high heat resistant thermoplastic resin, and preferably includes a thermosetting resin.

[0051] Thus, as a resin that can be cured to exhibit adhesive properties, there can be used a resin that contains one or more functional groups or sites that can be cured by heat, such as a glycidyl group, an isocyanate group, a hydroxy group, a carboxyl group, an amide group, etc., or a resin that contains one or more functional groups or sites that can be cured by active energy, such as an epoxide group, a cyclic ether group, a sulfide group, an acetal group, a lactone group, etc. Such a functional group or site can be, for example, an isocyanate group, a hydroxyl group, or a carboxyl group.

[0052] Specifically, the curable resin may be, for example, a polyurethane resin, an acrylic resin, a polyester resin, an isocyanate resin, or an epoxy resin having at least one of the functional groups or sites as described above, but is not limited thereto.

[0053] As an example, the binder resin may include a polyurethane resin, an isocyanate curing agent, and an epoxy resin.

[0054] The polymer-type magnetic material may contain the binder resin in an amount of 5% by weight to 40% by weight, 5% by weight to 20% by weight, 5% by weight to 15% by weight, or 7% by weight to 15% by weight.

[0055] The polymer magnetic material may contain, based on its weight, 6% by weight to 12% by weight of a polyurethane resin, 0.5% by weight to 2% by weight of an isocyanate curing agent, and 0.3% by weight to 1.5% by weight of an epoxy resin as the binder resin.

[0056] The polymer-type magnetic body can be manufactured by a sheeting process in which a magnetic powder and a polymer resin composition are mixed to form a slurry, which is then molded into a sheet and cured. In order to manufacture a large-area polymer-type magnetic body having a certain thickness, a block can be manufactured by a molding method using a mold. The above-mentioned manufacturing method may be a conventional sheet or block forming method.

[0057] <Nanocrystalline magnetic materials> The magnetic portion may include a nanocrystalline magnetic material.

[0058] When the nanocrystalline magnetic material is applied, the inductance (Ls) of the coil part decreases as the distance from the coil part increases, but the resistance (Rs) also decreases, so the quality factor (Q factor: Ls / Rs) of the coil part increases, improving charging efficiency and reducing heat generation.

[0059] For example, the nanocrystalline magnetic material may be an Fe-based nanocrystalline magnetic material, specifically, an Fe-Si-Al-based nanocrystalline magnetic material, an Fe-Si-Cr-based nanocrystalline magnetic material, or an Fe-Si-B-Cu-Nb-based nanocrystalline magnetic material.

[0060] More specifically, the nanocrystalline magnetic material may be a Fe-Si-B-Cu-Nb-based nanocrystalline magnetic material, in which Fe is 70% to 85% by weight, the sum of Si and B is 10% to 29% by weight, and the sum of Cu and Nb is 1% to 5% by weight (wherein "% by weight" refers to the percentage of the number of a specific element relative to the total number of elements). In the above composition range, an Fe-Si-B-Cu-Nb-based alloy can be easily formed into a nanocrystalline magnetic material by heat treatment.

[0061] The nanocrystalline magnetic material can be prepared, for example, by preparing an Fe-based alloy by rapid solidification by melt spinning (RSP) and then performing a magnetic field-free heat treatment at a temperature range of 300°C to 700°C for 30 minutes to 2 hours to obtain the desired magnetic permeability.

[0062] If the heat treatment temperature is less than 300° C., nanocrystals are not sufficiently generated, and the desired magnetic permeability cannot be obtained, requiring a long heat treatment time, while if the heat treatment temperature exceeds 700° C., the magnetic permeability may be significantly reduced by overheating. Therefore, within the above range, the heat treatment time may be lengthened when the heat treatment temperature is low, and shortened when the heat treatment temperature is high, to adjust the desired magnetic permeability.

[0063] Meanwhile, the nanocrystalline magnetic material can be formed into a thin film sheet having a thickness of, for example, 15 μm to 35 μm, because it is difficult to increase the thickness in the manufacturing process. Therefore, a magnetic part can be formed by stacking a plurality of such thin film sheets. In this case, an adhesive layer such as an adhesive tape can be inserted between the thin film sheets. In addition, the nanocrystalline magnetic material can be manufactured to include a plurality of nanocrystalline particles by crushing the thin film sheet with a pressure roll or the like in the latter stage of the manufacturing process to form a plurality of cracks in the thin film sheet.

[0064] <Area and thickness of magnetic part> The magnetic portion may be a magnetic sheet, a magnetic sheet stack, or a magnetic block.

[0065] The magnetic part may have a large area, specifically 200 cm 2 More than 400cm 2 or more, or 600cm 2 The magnetic portion may have an area of ​​10,000 cm or more. 2 It may have the following areas:

[0066] The large-area magnetic part may be constructed by combining a number of magnetic units, and the area of ​​the magnetic unit may be 60 cm 2 Over 90cm 2 , or 95cm 2 ~900cm 2 It could be.

[0067] 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 for manufacturing a normal film or sheet.

[0068] The magnetic sheet laminate may be one in which 20 or more, or 50 or more, of the magnetic sheets are laminated together. The magnetic sheet laminate may be one in which 150 or less, or 100 or less, of the magnetic sheets are laminated together.

[0069] 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, and the thickness of the magnetic block may be 6 mm or less.

[0070] <Magnetic properties of magnetic part> The magnetic portion may have a certain level of magnetic properties in the vicinity of a standard frequency for wireless charging of electric vehicles.

[0071] The standard frequency for wireless charging of electric vehicles is 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 band distinct from the frequency band applied to mobile electronic devices such as mobile phones.

[0072] At a frequency of 85 kHz, the magnetic part has a magnetic permeability that may vary depending on the material but is 5 or more, for example, 5 to 150,000, and depending on the specific material, may be 5 to 300, 500 to 3500, or 10,000 to 150,000. Also, at a frequency of 85 kHz, the magnetic permeability loss that may vary depending on the material but is 0 or more, for example, 0 to 50,000, and depending on the specific material, may be 0 to 1,000, 1 to 100, 100 to 1,000, or 5,000 to 50,000.

[0073] As an example, when the magnetic portion is a polymer-type magnetic block containing magnetic powder and binder resin, the magnetic permeability at a frequency of 85 kHz may be 5-130, 15-80, or 10-50, and the magnetic permeability loss may be 0-20, 0-15, or 0-5.

[0074] As another example, when the magnetic portion is a sintered ferrite magnetic body, the magnetic permeability at a frequency of 85 kHz may be 1000-5000, or 2000-4000, and the magnetic permeability loss may be 0-1000, 0-100, or 0-50.

[0075] As another example, when the magnetic portion is a nanocrystalline magnetic material, the magnetic permeability at a frequency of 85 kHz may be 500 to 3000, or 10000 to 150000, and the magnetic permeability loss may be 100 to 1000, or 8000 to 50000.

[0076] <Characteristics of magnetic part> As an example, the magnetic part may include a polymer-type magnetic material, and the polymer-type magnetic material may be elongated at a certain ratio. For example, the elongation rate of the polymer-type magnetic material may be 0.5% or more. The elongation property is difficult to obtain with a ceramic-based magnetic material that does not use a polymer, and even if a large-area magnetic part is distorted due to an impact, damage can be reduced. Specifically, the elongation rate of the polymer-type magnetic material may be 0.5% or more, 1% or more, or 2.5% or more. There is no particular upper limit to the elongation rate, but since the inductance and other characteristics of the magnetic part may decrease if the content of the polymer resin increases in order to improve the elongation rate, the elongation rate is preferably within 10%.

[0077] The magnetic portion has far superior shock resistance compared to typical sintered ferrite magnetic bodies, so that the characteristics of a wireless charging device using the magnetic portion are less affected by shock.

[0078] In this specification, the rate of change (%) in properties before and after impact can be calculated by the following formula. Characteristic change rate (%) = |characteristic value before impact - characteristic value after impact| / characteristic value before impact x 100

[0079] For example, when the magnetic part is subjected to an impact by being freely dropped from a height of 1 m, the inductance change rate in a wireless charging device using the magnetic part before and after the impact may be less than 5%, or 3% or less. More specifically, the inductance change rate may be 0% to 3%, 0.001% to 2%, or 0.01% to 1.5%.

[0080] In addition, when the magnetic part is subjected to impact by being freely dropped from a height of 1 m, the rate of change in quality factor (Q factor) in a wireless charging device using the magnetic part before and after the impact may be 0 to 5%, 0.001% to 4%, or 0.01% to 2.5%.

[0081] Furthermore, when the magnetic part is subjected to impact by being freely dropped from a height of 1 m, the resistance change rate in a wireless charging device using the magnetic part before and after the impact may be 0 to 2.8%, 0.001% to 1.8%, or 0.1% to 1.0%.

[0082] In addition, when the magnetic part is subjected to impact by being freely dropped from a height of 1 m, the rate of change in charging efficiency in a wireless charging device using the magnetic part before and after the impact may be 0 to 6.8%, 0.001% to 5.8%, or 0.01% to 3.4%.

[0083] Within this range, the performance of the wireless charging device can be well maintained at a certain level even in an environment where it is repeatedly subjected to actual shocks and vibrations.

[0084] [Heat dissipation part] The wireless charging device according to the above embodiment can efficiently dissipate heat by including a heat dissipation unit near the magnetic unit or coil unit that generates heat.

[0085] 2A and 2B, the heat dissipation unit 500 may be disposed between the magnetic unit 300 and the coil unit 200. In this case, there is an advantage that the heat generated in the magnetic unit and the coil unit can be simultaneously processed.

[0086] 2C, the heat dissipation part 500 may be disposed inside the magnetic part 300. In this case, there is an advantage that the heat generated inside the magnetic part can be effectively treated.

[0087] The structure in which the heat dissipation part is disposed inside the magnetic part may be designed in various ways. As one example, a polymeric magnetic material may be molded using a mold to have an internal space for inserting the heat dissipation part, and then the heat dissipation part may be inserted. As another example, a magnetic sheet laminate having a heat dissipation part inserted therein may be manufactured by inserting a heat dissipation part between a plurality of magnetic sheets and stacking them.

[0088] The heat dissipation part may be selectively disposed in a portion where heat is generated. For example, as shown in Fig. 2B, the heat dissipation part 500 may be disposed in a region where the coil part 200 is present. Thus, the heat dissipation part may effectively improve charging efficiency and heat dissipation characteristics even in a small area.

[0089] The heat dissipation part may be in direct contact with a part where heat is generated, and thus may efficiently dissipate heat. Specifically, the heat dissipation part may be in direct contact with at least one of the magnetic part and the conductive wire. As an example, as shown in Figs. 2A to 2C, the heat dissipation part 500 may be in direct contact with the magnetic part 300.

[0090] Alternatively, the heat dissipation part may be attached to a portion where heat is generated by a thermally conductive adhesive. Specifically, the heat dissipation part may be attached to the magnetic part by a thermally conductive adhesive. The thermally conductive adhesive may include a thermally conductive material such as a metal-based, carbon-based, or ceramic-based material, and may be, for example, an adhesive resin having thermally conductive particles dispersed therein.

[0091] The heat dissipation unit may be thermally connected to the shield unit in order to efficiently dissipate heat generated in the magnetic unit or the coil unit to the outside. Specifically, the heat dissipation unit may be connected to the shield unit directly or via a thermally conductive medium.

[0092] 2A to 2C, the heat dissipation unit 500 may be connected to the shield unit 400 via a thermally conductive medium 550. The thermally conductive medium may be made of the same or different material as the heat dissipation unit. For example, the thermally conductive medium may be made of a ceramic material or a carbon-based material. Alternatively, the thermally conductive medium may be made of the same material as the shield unit, for example, aluminum.

[0093] <Components of heat dissipation part> The heat dissipation portion may include a binder resin and insulating inorganic particles dispersed in the binder resin.

[0094] Examples of the binder resin include, but are not limited to, polyimide resin, polyamide resin, polycarbonate resin, acrylonitrile-butadiene-styrene (ABS) resin, polypropylene resin, polyethylene resin, polystyrene resin, polyphenylene sulfide (PPS) resin, polyether ether ketone (PEEK) resin, silicone resin, acrylic resin, polyurethane resin, polyester resin, isocyanate resin, and epoxy resin.

[0095] 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 that can be cured to exhibit adhesiveness. More specifically, the binder resin may be a resin that includes one or more functional groups or sites 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 that includes one or more functional groups or sites 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. Such functional groups or sites may be, for example, an isocyanate group, a hydroxyl group, or a carboxyl group.

[0096] As a specific example, the binder resin may be at least one of a silicone-based resin and an acrylic-based resin.

[0097] The insulating inorganic particles may include a non-carbonous inorganic material, that is, the insulating inorganic particles are preferably not carbon-based fillers such as graphite or carbon nanotubes.

[0098] The insulating inorganic particles may include ceramic particles. For example, the insulating inorganic particles may include a metal oxide or nitride. Specifically, the insulating inorganic particles may include at least one selected from the group consisting of silica, alumina, boron nitride, aluminum nitride, and magnesium oxide.

[0099] The content of the insulating inorganic particles in the heat dissipation part may be 70% by weight to 90% by weight, 70% by weight to 85% by weight, or 75% by weight to 90% by weight. When the content of the insulating inorganic particles is within the above-mentioned preferable range, it may be more advantageous in terms of thermal conductivity.

[0100] <Characteristics of heat dissipation part> The heat dissipation portion may have a sheet or ribbon shape.

[0101] The heat sink may have the same area as the magnetic part or may have a different area. For example, the heat sink may have a large area similar to that of the magnetic part. Specifically, the area of ​​the heat sink may be 200 cm2 or more. 2 More than 400cm 2 or more, or 600cm 2 The area of ​​the heat sink may be 10,000 cm or more. 2 Alternatively, the heat dissipation portion may have an area smaller than that of the magnetic portion. Specifically, the heat dissipation portion may have an area corresponding to an area of ​​the coil portion.

[0102] The thickness of the heat dissipation part may be 0.1 mm to 10 mm, or 1 mm to 5 mm. The thickness of the heat dissipation part may be smaller than the thickness of the magnetic part. For example, the thickness of the heat dissipation part may be 1 / 50 to 1 / 2, 1 / 10 to 1 / 2, or 1 / 5 to 1 / 3 of the thickness of the magnetic part.

[0103] The heat dissipation portion has insulating properties and thermal conductivity. For example, the surface resistance of the heat dissipation portion is 10 4 Ω / sq or more, specifically 10 6 The heat dissipation portion may have a thermal conductivity of 1 W / m·K or more, specifically 3 W / m·K or more, more specifically 3 W / m·K to 30 W / m·K. 4 The surface resistance may be Ω / sq or more and the thermal conductivity may be 1 W / m·K or more. In this case, the thermal conductivity may be horizontal thermal conductivity.

[0104] [housing] A wireless charging device according to the above implementations may further include a housing that houses the aforementioned components.

[0105] The housing allows components such as the coil unit, the shield unit, the magnetic unit, etc. to be appropriately arranged and assembled. The material and structure of the housing may be those of a typical housing used in a wireless charging device, and may be appropriately designed according to the components included therein.

[0106] 2A to 2C, a wireless charging device 10 according to one embodiment includes a housing 600, a coil section 200 disposed within the housing 600 and including a conductive wire, a shield section 400 disposed on the coil section 200, a magnetic section 300 disposed between the coil section 200 and the shield section 400, and an insulating heat dissipation section 500 disposed inside the magnetic section 300 or between the magnetic section and the coil section 200.

[0107] [Support part] The wireless charging device 10 may further include a support 100 for supporting the coil. The material and structure of the support may be the same as those of a typical support used in wireless charging devices. The support may have a flat plate structure or a groove formed along the shape of the coil so that the coil can be fixed.

[0108] [Spacer] In addition, the wireless charging device according to the embodiment may further include a spacer for securing a space between the shielding part and the magnetic part. The material and structure of the spacer may be the same as those of a typical spacer used in wireless charging devices.

[0109] (Electric Vehicles) FIG. 4 shows a means of transportation to which a wireless charging device is applied, specifically an electric vehicle, which is equipped with a wireless charging device at its bottom and can be wirelessly charged in a parking area equipped with a wireless charging system for electric vehicles.

[0110] 4, a mobile unit 1 according to one implementation includes a wireless charging device according to the implementation as a receiver 21. The wireless charging device functions as a receiver 21 for wireless charging of the mobile unit 1 and can receive power from a transmitter 22 of the wireless charging system.

[0111] The moving means includes a wireless charging device, which includes a housing, a coil portion disposed within the housing and including a conductive wire, a shield portion disposed on the coil portion, a magnetic portion disposed between the coil portion and the shield portion, and an insulating heat dissipation portion disposed inside the magnetic portion or between the magnetic portion and the coil portion.

[0112] The configurations and features of the components of the wireless charging device included in the transportation means are as described above.

[0113] The vehicle may further include a battery that receives power from the wireless charging device. The wireless charging device wirelessly receives the power and transmits it to the battery, and the battery may supply power to a drive train of the vehicle. The battery may be charged by power transmitted from the wireless charging device or another additional wired charging device.

[0114] The vehicle may further include a signal transmitter for transmitting information regarding charging to a transmitter of the wireless charging system for vehicles. The information regarding charging may be charging efficiency such as a charging speed, a charging state, and the like.

[0115] Below, manufacturing examples and test examples of the magnetic part used in the wireless charging device according to the above-mentioned embodiment will be described, but the realizable scope is not limited to these.

[0116] (Manufacturing Example 1: Manufacturing of magnetic parts) Step 1) Preparation of magnetic powder slurry 42.8 parts by weight of magnetic powder, 15.4 parts by weight of polyurethane resin dispersion (25% by weight of polyurethane resin, 75% by weight of 2-butanone), 1.0 parts by weight of isocyanate curing agent dispersion (62% by weight of isocyanate curing agent, 25% by weight of n-butyl acetate, 13% by weight of 2-butanone), 0.4 parts by weight of epoxy resin dispersion (70% by weight of epoxy resin, 3% by weight of n-butyl acetate, 15% by weight of 2-butanone, 12% by weight of toluene), and 40.5 parts by weight of toluene were mixed in a planetary mixer at a speed of about 40 rpm to 50 rpm for about 2 hours to prepare a magnetic powder slurry.

[0117] Step 2) Manufacturing the magnetic sheet laminate The prepared magnetic powder slurry was coated on a carrier film using a comma coater and dried at a temperature of about 110°C to form a polymeric magnetic material. The polymeric magnetic material was compressed and cured 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. The magnetic powder content in the sheet thus produced was about 90% by weight, and the thickness of each sheet was about 100 μm. 40 to 50 sheets of the above sheets were stacked to obtain a magnetic part with a thickness of about 4.8 mm.

[0118] (Comparative Example) As a comparative example, a ferrite magnetic sheet (thickness 5 mm) made by TDK Corporation was used.

[0119] (Test Example) The magnetic portions of Production Example 1 and the Comparative Example were tested by the following method.

[0120] (1) Growth rate The elongation was measured by the ASTM D412 C-type method on the magnetic part sample before impact using a universal testing machine (UTM, INSTRON 5982, INSTRON Corporation).

[0121] (2) Changes in characteristics before and after impact When the magnetic part sample was subjected to impact by free-falling from a height of 1 m, the electrical characteristics of the device using the magnetic part sample before and after the impact were calculated using the following formula. Characteristic change rate (%) = |characteristic value before impact - characteristic value after impact| / characteristic value before impact x 100

[0122] The electrical characteristics were measured at a frequency of 85 kHz by applying a coil and frame conforming to the SAE J2954 WPT1 Z2 Class standard TEST standard, laminating the magnetic part, spacer, and aluminum plate to manufacture a receiving unit (35.5 cm x 35.5 cm) and a transmitting unit (67.48 cm x 59.1 cm).

[0123] The inductance and resistance were measured using an LCR meter (IM3533, HIOKI).

[0124] The quality factor (Q factor) was calculated using the formula inductance x frequency x 2π / resistance.

[0125] The charging efficiency was measured under conditions of an output power of 1000 W and a frequency of 85 kHz. The results are shown in Tables 1 and 2 below.

[0126] [Table 1]

[0127] [Table 2]

[0128] As shown in the table, the ferrite sheet of the comparative example had an elongation rate of 0%, whereas the magnetic part of the manufacturing example 1 had an elongation rate of 3%. In addition, the magnetic part of the manufacturing example 1 not only had excellent inductance, quality factor, and resistance of the device using it before impact, but also had a change rate of each of the above characteristics measured in the range of 0 to 1% after impact. On the other hand, the ferrite sheet of the comparative example had a high change rate of inductance, quality factor, and resistance of the device using it after impact, and in particular, the charging efficiency change rate (decrease rate) was measured to be high at 3%. This confirmed that the magnetic part of the manufacturing example 1 is more suitable for wireless charging devices than the conventional ferrite sheet in environments where shocks are likely to be applied during operation, such as electric vehicles. [Explanation of symbols]

[0129] 1: Electric vehicles 10: Wireless charging device according to one implementation example 10': Prior art wireless charging device 21: Receiver 22: Transmitter 100, 100': Support part 200, 200': Coil section 300, 300': Magnetic part 400, 400': Shield section 500: Heat radiation part 550: Thermally conductive media 600: Housing

Claims

[Claim 1] A means of transportation including a wireless charging device, The wireless charging device, a coil portion including a conductive wire; a shield portion disposed on the coil portion; a magnetic portion disposed between the coil portion and the shield portion; an insulating heat dissipation part arranged inside the magnetic part or between the magnetic part and the coil part; a housing that accommodates the coil portion, the shield portion, the magnetic portion, and the heat dissipation portion, the magnetic portion includes a polymeric magnetic material, The heat dissipation portion has a sheet shape or a ribbon shape, the heat sink is spaced apart from the housing by a predetermined distance and is thermally connected to the shield via a thermally conductive medium; The thermally conductive medium includes a thermally conductive material made of a metal-based material, a ceramic-based material, or a carbon-based material; A moving means, wherein when the magnetic part is freely dropped from a height of 1 m to apply an impact, the rate of inductance change in a wireless charging device using the magnetic part before and after the impact is less than 5%.

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