Pavement adaptive to magnetic resonance type dynamic wireless charging system and construction process thereof

Abstract

The invention discloses a pavement adaptive to a magnetic resonance type dynamic wireless charging system and a construction process of the pavement, and belongs to the field of road engineering and road infrastructures. The pavement comprises a lower surface layer, a middle surface layer and an upper surface layer, a charging unit is arranged in the middle of the upper surface layer, and wear-resistant asphalt concrete is arranged on two sides; the charging unit is divided into three layers, the lower layer is nanometer metal heat conduction type asphalt concrete, the middle layer is an adhesive layer embedded with a transmitting coil, and the upper layer is ferrite magnetic enhanced asphalt concrete. Through the optimized material and structural design, the mechanical compatibility of the transmitting coil and the road surface is improved, the heat dissipation performance is also remarkably improved, the problem of system overheating is avoided, the magnetic loss is greatly reduced by optimizing the magnetic field distribution, the energy transmission efficiency of the magnetic resonance type wireless charging system is remarkably improved, and the energy loss is reduced; and meanwhile, the service life of the wireless charging system is prolonged, the maintenance cost is reduced, and an efficient and reliable solution is provided for dynamic wireless charging of the electric vehicle.

Description

Technical Field

[0001] The present invention relates to the field of road engineering and road infrastructure, and particularly relates to a road surface adapted to a magnetic resonance dynamic wireless charging system and its construction technology. Background Art

[0002] With the popularization of electric vehicles, wireless charging technology has attracted much attention due to its convenience and safety. As a cutting-edge technology, the magnetic resonance dynamic wireless charging system realizes non-contact power transmission through the principle of magnetic resonance coupling, and has the advantages of moderate transmission distance, large output power, high charging efficiency, and low sensitivity to coil position. This technology can not only meet the charging needs of electric vehicles, but also realize dynamic charging during vehicle driving, effectively solving the "range anxiety" problem.

[0003] However, integrating the wireless charging system into road infrastructure faces many challenges. Traditional wireless charging systems have deficiencies in aspects such as heat dissipation performance, magnetic loss, construction efficiency, and maintenance cost. For example, the heat dissipation problem may cause the system to overheat, reducing the charging efficiency and service life. In addition, magnetic loss will reduce the energy transmission efficiency, and complex construction technology will increase the cost and construction time. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned existing technologies, the purpose of the present invention is to provide a road surface adapted to a magnetic resonance dynamic wireless charging system and its construction technology, which significantly improves the heat dissipation performance, avoids the problem of system overheating, and greatly reduces the magnetic loss, significantly improves the energy transmission efficiency of the magnetic resonance wireless charging system, reduces the energy loss, and provides a more efficient dynamic charging solution for electric vehicles.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] Provide a road surface adapted to a magnetic resonance dynamic wireless charging system, including a bottom layer, a middle layer, and a top layer. The middle part of the top layer is a charging unit, and both sides are wear-resistant asphalt concrete; the charging unit is divided into three layers, the lower layer is nano-metal heat-conducting asphalt concrete, the middle layer is an adhesive layer embedded with transmitting coils, and the upper layer is ferrite magnetic-enhanced asphalt concrete; where:

[0007] The nano-metal heat-conducting high-efficiency asphalt concrete, the raw materials are counted by mass parts, including: 5 - 6 parts of asphalt, 45 - 70 parts of coarse aggregate, 15 - 35 parts of fine aggregate, 3 - 5 parts of mineral powder, 5.5 - 6.5 parts of nano-metal particles, and 0.1 - 0.3 parts of dispersant;

[0008] The ferrite magnetic enhanced asphalt concrete includes the following raw materials by mass parts: 5.5 - 6.5 parts of asphalt, 50 - 75 parts of coarse aggregate, 10 - 30 parts of fine aggregate, 3 - 5 parts of mineral powder, 8 - 12 parts of ferrite powder, and 0.1 - 0.2 parts of dispersant.

[0009] According to the above solution, the charging unit accounts for 20% - 40% of the width of the upper layer.

[0010] According to the above solution, the nano metal particles are at least one of ZnO2, Al2O3, and TiO2.

[0011] Preferably, the nano metal particles are spherical or quasi-spherical.

[0012] Preferably, the purity of the nano metal particles is above 98.5%.

[0013] Preferably, the average particle size of the nano metal particles is 10 - 50nm.

[0014] Preferably, the specific surface area of the nano metal particles is 100 - 200m 2 / g.

[0015] According to the above solution, in the nano metal heat-conducting asphalt concrete or ferrite magnetic enhanced asphalt concrete, the asphalt is one or more of 70# road petroleum asphalt, SBS modified asphalt, rubber asphalt, and high-viscoelastic asphalt; the aggregate is one or more of basalt, limestone, diabase, and steel slag; the mineral powder is the powder ground from limestone.

[0016] According to the above solution, in the nano metal heat-conducting asphalt concrete or ferrite magnetic enhanced asphalt concrete, the dispersant is a mixture of stearic acid, oleic acid, and monoglyceride stearate, and their mass ratio is 2 - 4:1 - 2:1.

[0017] According to the above solution, in the nano metal heat-conducting asphalt concrete or ferrite magnetic enhanced asphalt concrete, the coarse aggregate has a particle size > 4.75mm, the fine aggregate has a particle size < 4.75mm, and the mineral powder has a particle size < 0.075mm.

[0018] According to the above solution, the ferrite powder is one of manganese-zinc ferrite powder, nickel-zinc ferrite, and manganese-magnesium-zinc ferrite.

[0019] According to the above solution, the preparation process of the nano metal heat-conducting asphalt concrete includes the following steps:

[0020] 1) Heat the asphalt to 160 - 170°C, and heat the aggregate and nano metal micropowder to 160 - 180°C respectively;

[0021] 2) After mixing the coarse aggregate and the fine aggregate evenly, add the asphalt and mix for 50 - 70s;

[0022] 3) Finally, add nano metal powder and dispersant and mix for 50 - 70 s to obtain nano metal heat - conductive asphalt concrete.

[0023] According to the above - mentioned solution, the preparation process of the ferrite magnetic - enhanced asphalt concrete includes the following steps:

[0024] 1) Heat the asphalt to 160 - 170 °C, and heat the aggregate and ferrite powder to 180 - 190 °C respectively;

[0025] 2) Thoroughly mix the coarse aggregate and fine aggregate evenly, then add the pre - heated asphalt and continuously mix for 50 - 70 seconds;

[0026] 3) Add ferrite magnetic core powder and dispersant, and continue to mix for 50 - 70 seconds to obtain ferrite magnetic - enhanced asphalt mixture.

[0027] According to the above - mentioned solution, the input power line of the wireless charging asphalt concrete charging unit is arranged on the surface of the middle layer, and then synchronous chip seal is used to ensure that the input power line is completely embedded; the transmitting coil is connected to the input power line.

[0028] According to the above - mentioned solution, the construction of the middle layer and the bottom layer of the road surface is normally completed in accordance with the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40 - 2004).

[0029] According to the above - mentioned solution, the wear - resistant asphalt concrete is one or more of basalt asphalt concrete, diabase asphalt concrete, steel slag asphalt concrete, and limestone asphalt concrete.

[0030] According to the above - mentioned solution, the raw material of the tack coat is emulsified asphalt, modified emulsified asphalt, hot asphalt or epoxy resin asphalt.

[0031] Provide a road surface construction process adapted to the dynamic wireless charging system as described above, including the following steps:

[0032] 1) After the bottom layer and the middle layer of the road surface are normally constructed, arrange the input power line on the surface of the middle layer, and then spread synchronous chip seal to ensure that the input power line is completely embedded;

[0033] 2) Then lay the charging unit in the middle of the upper layer: first lay the nano metal heat - conductive asphalt concrete, then lay the transmitting coil, sprinkle tack coat oil above and below the coil until the transmitting coil is completely covered, and then lay the ferrite magnetic - enhanced asphalt concrete;

[0034] 3) After the charging unit in the middle of the upper layer is laid, lay the wear - resistant asphalt concrete on both sides of the upper layer to obtain a road surface adapted to the dynamic wireless charging system.

[0035] According to the above solution, in step 2), the charging unit is to first lay the lower layer of nano-metal heat-conducting asphalt concrete, and use conventional compaction. After the temperature of the concrete drops below 60°C, set the transmitting coil, and sprinkle 0.6 - 1.0 L / m 2 tack coat oil to ensure that the coil is completely covered up and down, and after spraying evenly, place it for 1 - 2 h. Then lay the ferrite magnetic enhancement type asphalt concrete, use conventional compaction, and cool it to room temperature, then the laying of the charging unit is completed.

[0036] Preferably, the tack coat oil is one of emulsified asphalt, modified emulsified asphalt, hot asphalt, and epoxy resin asphalt.

[0037] According to the above solution, in step 3), after the middle part of the upper layer is laid, sprinkle SBS modified asphalt on both sides of it, and normally lay wear-resistant asphalt concrete on both sides of the road. After conventional compaction, place it for 2 - 4 h. When the temperature drops below 60°C, the traffic can be opened, and a road surface adapted to the dynamic wireless charging system is obtained.

[0038] The present invention provides a road surface adapted to a dynamic wireless charging system. The middle part of the upper layer is a charging unit, and both sides are wear-resistant asphalt concrete; the charging unit is divided into three layers, the lower layer is nano-metal heat-conducting asphalt concrete, the middle layer is a tack coat embedded with a transmitting coil, and the upper layer is ferrite magnetic enhancement type asphalt concrete; wherein:

[0039] In the nano-metal heat-conducting asphalt concrete, by configuring a suitable ratio of nano-metal powder and dispersant, it is ensured that the nano-metal powder is evenly dispersed in the concrete, closely combined with the asphalt matrix, forms an efficient heat conduction channel, greatly improves its heat dissipation performance, avoids local overheating, and prolongs the service life;

[0040] In the ferrite magnetic enhancement type asphalt concrete, by configuring a suitable ratio of ferrite powder and dispersant, it is ensured that sufficient and evenly dispersed ferrite powder constructs a continuous magnetic network, efficiently guides and disperses the magnetic field, optimizes the magnetic field distribution, reduces magnetic loss, so as to effectively improve the magnetic performance, and at the same time avoids the adverse impact on the mechanical properties of the road surface caused by too much ferrite powder.

[0041] The asphalt concrete of the charging unit of the present invention is provided with a double-layer structure. The upper layer uses ferrite magnetic enhancement type asphalt concrete, which can effectively reduce the loss when the magnetic field penetrates the road surface; the lower layer uses metal heat-conducting high-efficiency asphalt concrete, which can effectively conduct heat to the surrounding and downward, avoiding damage to the road surface structure caused by long-term heat accumulation on the road surface, and is beneficial to protecting the ferrite magnetic enhancement type asphalt concrete of the upper layer and effectively improving the magnetic performance; the road surface designed by the present invention greatly improves the efficiency of wireless charging, significantly prolongs the service life of the wireless charging system, and reduces the maintenance cost.

[0042] In addition, the nano-metal particles and ferrite powder particles are evenly dispersed in the asphalt concrete, reducing stress concentration and improving the anti-fatigue performance and anti-cracking performance of the concrete. The double-layer asphalt concrete structure design and the multi-layer use of the tack coat improve the interlayer shear strength, enabling better cooperation between each layer of the road surface and the charging coil, reducing the risk of interlayer peeling. This design can enhance the mechanical compatibility between the transmitting coil and the road surface, and has a convenient construction process and excellent road performance.

[0043] The beneficial effects of the present invention are as follows:

[0044] 1. The present invention provides a road surface adapted to a magnetic resonance dynamic wireless charging system. The charging unit layer adopts a three-layer structure design. The lower layer is nano-metal heat-conducting asphalt concrete, the middle layer is a tack coat embedded with a transmitting coil, and the upper layer is ferrite magnetic-enhanced asphalt concrete. Through optimized material and structure design, not only the mechanical compatibility between the transmitting coil and the road surface is improved, but also the heat dissipation performance is significantly enhanced, avoiding the problem of system overheating. And by optimizing the magnetic field distribution, the magnetic loss is greatly reduced, the energy transmission efficiency of the magnetic resonance wireless charging system is significantly improved, the energy loss is reduced, providing a more efficient dynamic charging solution for electric vehicles. At the same time, the service life of the wireless charging system is significantly extended, and the maintenance cost is reduced. The present invention provides an efficient and reliable solution for the dynamic wireless charging of electric vehicles, which helps to promote the popularization of electric vehicles, reduce the dependence on traditional fuel vehicles, and promote the development of green transportation, having important social and environmental significance.

[0045] 2. The present invention provides a construction process for a road surface adapted to a magnetic resonance dynamic wireless charging system. The process is simple, the raw materials are cheap and easily available, the compatibility between layers is good, the obtained road surface has good heat dissipation performance and charging efficiency at the same time, and also has excellent road performance, effectively extending the service life of the road surface, having important application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the wireless charging road surface structure in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0047] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0048] In the embodiment of the present invention, a road surface adapted to a magnetic resonance dynamic wireless charging system is provided, as Figure 1As shown, the road surface includes a bottom layer, a middle layer, and a top layer; the middle part of the top layer is a charging unit, and the two sides are wear-resistant asphalt concrete; the charging unit is divided into three layers, the lower layer is nano-metal heat-conducting asphalt concrete, the middle layer is an adhesive layer embedded with transmitting coils, and the upper layer is ferrite magnetic-enhanced asphalt concrete; where:

[0049] For the nano-metal heat-conducting high-efficiency asphalt concrete, the raw materials by mass fraction include: 5-6 parts of asphalt, 45-70 parts of coarse aggregate, 15-35 parts of fine aggregate, 3-5 parts of mineral powder, 5.5-6.5 parts of nano-metal particles, and 0.1-0.3 parts of dispersant;

[0050] For the ferrite magnetic-enhanced asphalt concrete, the raw materials by mass fraction include: 5.5-6.5 parts of asphalt, 50-75 parts of coarse aggregate, 10-30 parts of fine aggregate, 3-5 parts of mineral powder, 8-12 parts of ferrite powder, and 0.1-0.2 parts of dispersant.

[0051] In one embodiment, the charging unit accounts for 20%-40% of the width of the top layer.

[0052] In one embodiment, the nano-metal particles are at least one of ZnO2, Al2O3, and TiO2. Preferably, the nano-metal particles are spherical or quasi-spherical, with a purity of more than 98.5%, an average particle size of 10-50nm, and a specific surface area of 100-200m 2 / g.

[0053] In one embodiment, in the nano-metal heat-conducting asphalt concrete or the ferrite magnetic-enhanced asphalt concrete, the asphalt is one or more of 70# road petroleum asphalt, SBS modified asphalt, rubber asphalt, and high-viscoelastic asphalt; the aggregate is one or more of basalt, limestone, diabase, and steel slag; the mineral powder is a powder ground from limestone.

[0054] In one embodiment, in the nano-metal heat-conducting asphalt concrete or the ferrite magnetic-enhanced asphalt concrete, the dispersant is a mixture of stearic acid, oleic acid, and monoglyceride stearate, and their mass ratio is 2-4:1-2:1.

[0055] In one embodiment, in the nano-metal heat-conducting asphalt concrete or the ferrite magnetic-enhanced asphalt concrete, the coarse aggregate has a particle size > 4.75mm, the fine aggregate has a particle size < 4.75mm, and the mineral powder has a particle size < 0.075mm.

[0056] In one embodiment, the ferrite powder is one of manganese-zinc ferrite powder, nickel-zinc ferrite, and manganese-magnesium-zinc ferrite.

[0057] In one embodiment, an input power line of the wireless charging asphalt concrete charging unit is arranged on the surface of the middle layer, and then a synchronous chip seal is adopted to ensure that the input power line is completely embedded; the transmitting coil is connected to the input power line.

[0058] In one embodiment, the construction of the middle layer and the bottom layer of the road surface is normally completed in accordance with the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0059] In one embodiment, the wear-resistant asphalt concrete is one or more of basalt asphalt concrete, diabase asphalt concrete, steel slag asphalt concrete, and limestone asphalt concrete.

[0060] In one embodiment, the raw material of the tack coat is emulsified asphalt, modified emulsified asphalt, hot asphalt or epoxy resin asphalt.

[0061] The specific indexes of the materials used in the following embodiments are as follows:

[0062] The structure of the transmitting coil is a double rectangle, which is formed by flat spiral winding of 0.1×1500 strands of Litz wire with a diameter of 4.47 mm for 15 turns. The magnetic core is made of material JF95 and has a size of 400×600×2 mm 3 。

[0063] The wear-resistant asphalt concrete is basalt asphalt concrete.

[0064] The asphalt is 70# road petroleum asphalt.

[0065] The dispersant is a mixture of stearic acid, oleic acid and monoglyceride stearate, and the mass ratio is 3:2:1.

[0066] The aggregate is limestone, where the coarse aggregate particle size is >4.75 mm and the fine aggregate is the particle size <4.75 mm.

[0067] The mineral powder is a powder ground from limestone, and the particle size is <0.075 mm.

[0068] The ferrite powder is manganese-zinc ferrite powder;

[0069] The nano metal micropowder is ZnO, spherical, with a purity of 98.5%, an average particle size of 20-25 nm, a specific surface area of 120 m 2 / g, and a density of 2.806 g / cm 3 。

[0070] Example 1

[0071] Provide a road surface adapted to a dynamic wireless charging system, including a bottom layer, a middle layer and a top layer. The middle part of the top layer is a charging unit with a width of 1 m, and both sides are wear-resistant asphalt concrete with widths of 1.25 m each. The charging unit is divided into three layers. The lower layer is nano-metal heat-conducting asphalt concrete, the middle layer is an adhesive layer embedded with transmitting coils, and the upper layer is ferrite magnetic-enhanced asphalt concrete. Among them:

[0072] By mass, the nano-metal heat-conducting high-efficiency asphalt concrete includes the following components: 6 parts of asphalt, 50 parts of coarse aggregate, 25 parts of fine aggregate, 5 parts of mineral powder, 6 parts of nano-metal micropowder, and 0.15 parts of dispersant. Its preparation includes the following steps: Heat the asphalt to 165 °C, and heat the aggregate and nano-metal micropowder to 180 °C respectively; After mixing the coarse aggregate and the fine aggregate evenly, add the asphalt and mix for 60 s, and finally add the nano-metal micropowder and the dispersant and mix for 60 s to obtain the nano-metal heat-conducting high-efficiency asphalt concrete.

[0073] By mass, the ferrite magnetic-enhanced asphalt concrete includes the following components: 5 parts of asphalt, 55 parts of coarse aggregate, 20 parts of fine aggregate, 5 parts of mineral powder, 8 parts of ferrite powder, and 0.15 parts of dispersant. Its preparation includes the following steps: Heat the asphalt to 170 °C, and heat the aggregate and ferrite powder to 185 °C respectively; First, mix the coarse aggregate and the fine aggregate evenly, then add the preheated asphalt and continuously mix for 60 s, and finally add the ferrite powder and the dispersant and continue to mix for 60 s to obtain the ferrite magnetic-enhanced asphalt concrete.

[0074] Provide a construction process for the above road surface, and the specific steps are as follows:

[0075] 1) Normally complete the construction of the middle layer and the bottom layer of the road surface according to the "Technical Specification for Highway Asphalt Pavement Construction". Then, lay the input power line on the surface of the middle layer, and then spread the synchronous gravel seal to ensure that the input power line is completely embedded;

[0076] 2) First lay the nano-metal heat-conducting asphalt concrete in the middle of the road and compact it conventionally, and the placement time is 1.5 h;

[0077] 3) Wait for the nano-metal heat-conducting asphalt concrete to cool to 60 °C, set the transmitting coil, and spread 0.8 L / m 2 of high-viscosity elastic emulsified asphalt to ensure that the transmitting coil is completely covered up and down, and compact it conventionally, and the placement time is 1 h;

[0078] 4) After the high-viscosity elastic emulsified asphalt is solidified, continue to lay the ferrite magnetic-enhanced asphalt concrete on it, compact it conventionally, and cool it to room temperature;

[0079] 5) After the ferrite magnetic enhanced asphalt concrete is cured, SBS modified asphalt is spread on both sides of it, and wear-resistant asphalt concrete is normally laid on both sides of the road. After conventional compaction, it is left for 3 h, and traffic can be opened after the temperature drops below 60 °C, obtaining a road surface adapted to the dynamic wireless charging system.

[0080] After the road surface construction is completed, a new energy vehicle equipped with a receiving end is used to test its charging efficiency. Samples are taken in the middle of the road surface for inspection results (see Tables 1 and 2). The static charging efficiency reaches 92%, and the charging efficiency is 89% when the vehicle travels at 60 km / h, indicating excellent road charging performance. After working for 24 h at 25 °C, the temperature is only 45 °C, indicating excellent road heat dissipation performance. The immersion residual stability is 91%, the dynamic stability is 6515 times / mm, the interlayer shear strength is 1.25 MPa, and the fatigue life at 0.5 stress ratio is 34642 times, indicating excellent road performance.

[0081] Example 2

[0082] Provide a road surface adapted to the dynamic wireless charging system, including a bottom layer, a middle layer and a top layer. The middle part of the top layer is a charging unit with a width of 1 m, and both sides are wear-resistant asphalt concrete with a width of 1.25 m each; the charging unit is divided into three layers, the lower layer is nano-metal heat-conducting asphalt concrete, the middle layer is an adhesive layer embedded with transmitting coils, and the upper layer is ferrite magnetic enhanced asphalt concrete; where:

[0083] By mass, the nano-metal heat-conducting high-efficiency asphalt concrete includes the following components: 6 parts of asphalt, 60 parts of coarse aggregate, 30 parts of fine aggregate, 4 parts of mineral powder, 6.5 parts of nano-metal micropowder, and 0.3 parts of dispersant. Its preparation includes the following steps: heat the asphalt to 165 °C, and heat the aggregate and nano-metal micropowder to 180 °C respectively; after mixing the coarse aggregate and the fine aggregate evenly, add the asphalt and mix for 60 s, and finally add the nano-metal micropowder and the dispersant, and mix at a stirring rate of 5000 r / min for 60 s to obtain nano-metal heat-conducting high-efficiency asphalt concrete.

[0084] By mass, the ferrite magnetic enhanced asphalt concrete includes the following components: 7 parts of asphalt, 60 parts of coarse aggregate, 20 parts of fine aggregate, 3 parts of mineral powder, 10 parts of ferrite powder, and 0.15 parts of dispersant. Its preparation includes the following steps: heat the asphalt to 170 °C, and heat the aggregate and ferrite powder to 185 °C respectively; first mix the coarse aggregate and the fine aggregate evenly, then add the preheated asphalt, continue to mix for 60 seconds, and finally add the ferrite powder and the dispersant, and continue to mix for 60 seconds to obtain ferrite magnetic enhanced asphalt concrete.

[0085] Provide a construction process for the above road surface, and the specific steps are as follows:

[0086] 1) After the middle layer and the bottom layer of the road surface are normally constructed in accordance with the Technical Specifications for Highway Asphalt Pavement Construction, the input power line is laid on the surface of the middle layer, and then synchronous crushed stone seal coat is spread to ensure that the input power line is completely embedded.

[0087] 2) First, nano-metal heat-conducting asphalt concrete is laid in the middle of the road and compacted conventionally, and the placement time is 1.5 h.

[0088] 3) Wait for the nano-metal heat-conducting asphalt concrete to cool to 60 °C, set the transmitting coil, and spread 0.8 L / m 2 of high-viscosity elastic emulsified asphalt, and ensure that the upper and lower parts of the transmitting coil are completely compacted conventionally, and the placement time is 1 h.

[0089] 4) After the high-viscosity elastic emulsified asphalt is cured, continue to lay ferrite magnetic-enhanced asphalt concrete on it, and compact it conventionally and cool it to normal temperature.

[0090] 5) After the ferrite magnetic-enhanced asphalt concrete is cured, SBS modified asphalt is spread on both sides of it, and wear-resistant asphalt concrete is normally laid on both sides of the road. After conventional compaction, it is placed for 3 h. When the temperature drops below 60 °C, the traffic can be opened, and a road surface adapted to the dynamic wireless charging system is obtained.

[0091] After the road surface construction is completed, a new energy vehicle equipped with a receiving end is used to test its charging efficiency, and the test results are sampled in the middle of the road surface (see Tables 1 and 2). The static charging efficiency reaches 93%, and the charging efficiency is 90% when the vehicle travels at 60 km / h, indicating excellent charging performance for road use. After working for 24 h at 25 °C, the temperature is only 43 °C, indicating excellent heat dissipation performance for road use. The immersion residual stability is 92%, the dynamic stability is 6417 times / mm, the interlayer shear strength is 1.28 MPa, and the fatigue life at 0.5 stress ratio is 35124 times, indicating excellent road use performance.

[0092] Example 3

[0093] Provide a road surface adapted to the dynamic wireless charging system, including a bottom layer, a middle layer and a top layer. The middle part of the top layer is a charging unit with a width of 1 m, and both sides are wear-resistant asphalt concrete with a width of 1.25 m each; the charging unit is divided into three layers, the lower layer is nano-metal heat-conducting asphalt concrete, the middle layer is an adhesive layer embedded with a reflection coil, and the upper layer is ferrite magnetic-enhanced asphalt concrete; where:

[0094] By mass fraction, the nano-metal heat-conducting high-efficiency asphalt concrete comprises the following components: 5 parts of asphalt, 45 parts of coarse aggregate, 25 parts of fine aggregate, 3 parts of mineral powder, 6.5 parts of nano-metal micropowder, and 0.1 part of dispersant. Its preparation comprises the following steps: heating the asphalt to 165 °C, and heating the aggregate and nano-metal micropowder to 180 °C respectively; after uniformly mixing the coarse aggregate and the fine aggregate, adding the asphalt and mixing for 60 s, and finally adding the nano-metal micropowder and the dispersant and mixing for 60 s to obtain the nano-metal heat-conducting high-efficiency asphalt concrete.

[0095] By mass fraction, the ferrite magnetic-enhanced asphalt concrete comprises the following components: 5.5 parts of asphalt, 55 parts of coarse aggregate, 30 parts of fine aggregate, 4 parts of mineral powder, 12 parts of ferrite powder, and 0.1 part of dispersant. Its preparation comprises the following steps: heating the asphalt to 170 °C, and heating the aggregate and ferrite powder to 185 °C respectively; first fully mixing the coarse aggregate and the fine aggregate evenly, then adding the preheated asphalt and continuously mixing for 60 s, and finally adding the ferrite powder and the dispersant and continuing to mix for 60 s to prepare the ferrite magnetic-enhanced asphalt concrete.

[0096] A construction process for the above pavement is provided, and the specific steps are as follows:

[0097] 1) After normally completing the construction of the middle surface layer and the bottom surface layer of the pavement in accordance with the "Technical Specifications for Highway Asphalt Pavement Construction"; then laying the input power line on the surface of the middle surface layer, and then spreading the synchronous chip seal to ensure that the input power line is completely embedded;

[0098] 2) First lay the nano-metal heat-conducting asphalt concrete in the middle of the road, and compact it conventionally, and the placement time is 1.5 h;

[0099] 3) Wait until the nano-metal heat-conducting asphalt concrete cools to 60 °C, set the transmitting coil, and spread 0.8 L / m 2 of high-viscosity elastic emulsified asphalt to ensure that the transmitting coil is completely covered up and down, and compact it conventionally, and the placement time is 1 h;

[0100] 4) After the high-viscosity elastic emulsified asphalt is cured, continue to lay the ferrite magnetic-enhanced asphalt concrete on it, and compact it conventionally and cool it to room temperature;

[0101] 5) After the ferrite magnetic-enhanced asphalt concrete is cured, spread SBS modified asphalt on both sides of it, and normally lay wear-resistant asphalt concrete on both sides of the road. After conventional compaction, place it for 3 h, and the traffic can be opened after the temperature drops below 60 °C to obtain a pavement adapted to the dynamic wireless charging system.

[0102] After the road surface construction is completed, a new energy vehicle equipped with a receiver is used to test its charging efficiency. The test results of samples taken from the middle of the road surface are shown in Tables 1 and 2. The static charging efficiency reaches 95%, and the charging efficiency is 92% when the vehicle is traveling at 60 km / h, indicating excellent charging performance for road use. After working for 24 hours at 25°C, the temperature is only 42°C, indicating excellent heat dissipation performance for road use. The immersion residue stability is 93%, the dynamic stability is 6349 times / mm, the interlayer shear strength is 1.31 MPa, and the fatigue life at 0.5 stress ratio is 36189 times, indicating excellent road performance.

[0103] Comparative Example 1

[0104] The difference between this comparative example and Example 1 is that the upper ferrite magnetic enhanced asphalt concrete is not used in the asphalt concrete charging unit, and it is replaced with wear-resistant asphalt concrete. The specific steps are the same as those in Example 1.

[0105] After the wireless charging road surface is completed, a new energy vehicle equipped with a receiver is used to test its charging efficiency. The static charging efficiency is 65%, and the charging efficiency is 60% when the vehicle is traveling at 60 km / h. After working for 24 hours, the temperature reaches 52°C. The specific results are shown in Tables 1 and 2.

[0106] Comparative Example 2

[0107] The difference between this comparative example and Example 1 is that the lower nano-metal heat-conducting high-efficiency asphalt concrete is not used in the asphalt concrete charging unit, and it is replaced with wear-resistant asphalt concrete. The specific steps are the same as those in Example 2.

[0108] After the wireless charging road surface is completed, a new energy vehicle equipped with a receiver is used to test its charging efficiency. The static charging efficiency is 87%, and the charging efficiency is 83% when the vehicle is traveling at 60 km / h. After working for 24 hours, the temperature reaches 63°C. The specific results are shown in Tables 1 and 2.

[0109] Comparative Example 3 (ordinary road surface structure)

[0110] The road surface provided in this comparative example is applied to an ordinary road surface. The specific steps are the same as those in Example 3, except that the upper ferrite magnetic enhanced asphalt concrete and the lower nano-metal heat-conducting high-efficiency asphalt concrete are not used in the asphalt concrete charging unit, and they are replaced with wear-resistant asphalt concrete.

[0111] After the wireless charging road surface is completed, a new energy vehicle equipped with a receiver is used to test its charging efficiency. The static charging efficiency is 62%, and the charging efficiency is 57% when the vehicle is traveling at 60 km / h. After working for 24 hours, the temperature reaches 65°C. The specific results are shown in Tables 1 and 2.

[0112] Table 1. Wireless charging efficiency and road surface temperature results of the charging road surfaces in the examples and comparative examples

[0113]

[0114]

[0115] Table 2. Road performance of asphalt concrete prepared in Examples 1-3 and Comparative Examples 1-3

[0116]

[0117] As can be seen from Examples 1-3, for the dynamic wireless charging road surface of the present invention, the charging efficiency at the designed speed (60 km / h) is greater than 85%, with high charging efficiency and high heat dissipation efficiency, and all have excellent road performance, which can effectively extend the service life of the system.

[0118] As can be seen from the comparison between Example 1 and Comparative Example 1, without the upper-layer ferrite magnetic-enhanced asphalt concrete, the dynamic charging efficiency of Comparative Example 1 is only 60%, which is about 30% lower than that of Example 1.

[0119] As can be seen from the comparison between Example 1 and Comparative Example 2, without the lower-layer nano-metal heat-conducting high-efficiency asphalt concrete, the working temperature of Comparative Example 2 reaches 56°C, which is 11°C higher than that of Example 1. At the same time, the dynamic charging efficiency at this time is 83%, which is 6% lower than that of Example 1, indicating that the presence of the lower-layer nano-metal heat-conducting high-efficiency asphalt concrete can improve the heat dissipation of the road surface while also improving the charging efficiency of the road surface, having a synergistic effect.

[0120] As can be seen from the comparison between Example 1 and Comparative Example 3, using the conventional construction process will result in low charging efficiency of the road surface, and at the same time, the road surface is in a high-temperature state for a long time, resulting in most of the transmitting coils being damaged and poor road performance.

[0121] As can be seen from the comparison of Examples 1, 2, and 3, by adding an appropriate amount of ferrite powder, the obtained ferrite magnetic-enhanced asphalt concrete can stably improve the charging efficiency of the wireless charging system; by adding an appropriate amount of nano-powder, the obtained nano-metal heat-conducting high-efficiency asphalt concrete can effectively improve the heat dissipation capacity of the system.

[0122] Although the embodiments of the present invention have been disclosed as above, they are not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details.

Claims

1. A road surface adapted to a magnetic resonance dynamic wireless charging system, comprising a bottom layer, a middle layer and a top layer, characterized in that, The middle part of the upper layer is the charging unit, and both sides are wear-resistant asphalt concrete; the charging unit is divided into three layers, the lower layer is nano-metal thermal conductive asphalt concrete, the middle layer is the adhesive layer embedded with the transmitting coil, and the upper layer is ferrite magnetic enhanced asphalt concrete; wherein: The raw materials of the nano-metal thermal conductive asphalt concrete include, by weight, 5-6 parts of asphalt, 45-70 parts of coarse aggregate, 15-35 parts of fine aggregate, 3-5 parts of mineral powder, 5.5-6.5 parts of nano-metal particles, and 0.1-0.3 parts of dispersant. The raw materials of the ferrite magnetic enhanced asphalt concrete include, by mass, 5.5-6.5 parts of asphalt, 50-75 parts of coarse aggregate, 10-30 parts of fine aggregate, 3-5 parts of mineral powder, 8-12 parts of ferrite powder, and 0.1-0.2 parts of dispersant.

2. The road surface according to claim 1, characterized in that, The nano metal particles are at least one of ZnO2, Al2O3 and TiO2.

3. The road surface according to claim 1, wherein, The ferrite powder is one of manganese zinc ferrite powder, nickel zinc ferrite, and manganese magnesium zinc ferrite.

4. The road surface according to claim 1, characterized in that In nano-metal thermal conductive asphalt concrete or ferrite magnetic enhanced asphalt concrete, the asphalt is one or more of 70# road petroleum asphalt, SBS modified asphalt, rubber asphalt, and high viscoelastic asphalt; the aggregate is one or more of basalt, limestone, diabase, and steel slag; and the mineral powder is powder ground from limestone.

5. The road surface according to claim 1, characterized in that, In the nano-metal thermal conductive asphalt concrete or the ferrite magnetic enhanced asphalt concrete, the dispersant is a mixture of stearic acid, oleic acid and stearic acid monoglyceride, and the mass ratio thereof is 2-4:1-2:

1.

6. The road surface according to claim 1, characterized in that The nano-metal thermal conductive asphalt concrete is prepared by the following steps: 1) Heat the asphalt to 160-170°C, and heat the coarse aggregate, fine aggregate and nano-metal powder to 160-180°C respectively; 2) After the coarse aggregate and fine aggregate are evenly mixed, add asphalt and mix for 50-70 seconds; 3) Finally, add nano-metal powder and dispersant and mix for 50-70 seconds to obtain nano-metal thermal conductive asphalt concrete; The ferrite magnetic enhanced asphalt concrete is prepared by the following steps: 1) Heat the asphalt to 160-170°C, and heat the coarse aggregate, fine aggregate and ferrite powder to 180-190°C respectively; 2) Mix the coarse aggregate and fine aggregate thoroughly, then add the preheated asphalt and continue mixing for 50-70 seconds; 3) Add ferrite core powder and dispersant and continue mixing for 50-70 seconds to obtain ferrite magnetic enhanced asphalt mixture.

7. The road surface according to claim 1, characterized in that, The wear-resistant asphalt concrete is one or more of basalt asphalt concrete, diabase asphalt concrete, steel slag asphalt concrete, and limestone asphalt concrete; the raw material of the adhesive layer is emulsified asphalt, modified emulsified asphalt, hot asphalt or epoxy resin asphalt.

8. The road surface according to claim 1, characterized in that, The surface of the middle surface layer is provided with an input power line of the wireless charging asphalt concrete charging unit, and then a synchronous gravel seal layer is used to ensure that the input power line is completely embedded; the transmitting coil is connected to the input power line.

9. A road construction process adapted to a magnetic resonance dynamic wireless charging system according to any one of claims 1-8, characterized in that, The following steps are involved: 1) After the lower layer and the middle layer of the road surface are normally constructed, lay the input power cable on the surface of the middle layer, and then spread synchronous chip seal to ensure that the input power cable is completely embedded; 2) Then lay the charging unit in the middle of the upper layer: first lay the nano-metal heat-conducting asphalt concrete, then lay the transmitting coil, sprinkle tack coat oil on the upper and lower sides of the coil until the transmitting coil is completely covered, and then lay the ferrite magnetic-enhanced asphalt concrete; 3) After the charging unit in the middle of the upper layer is laid, lay the wear-resistant asphalt concrete on both sides of the upper layer, and the road surface adapted to the dynamic wireless charging system is obtained.

10. The construction process according to claim 9, wherein in step 2), the charging unit is to first lay the nano-metal heat-conducting asphalt concrete in the lower layer, and use conventional compaction. After the temperature of the concrete drops below 60 °C, then lay the transmitting coil, sprinkle tack coat oil, ensure that the upper and lower sides of the coil are completely covered, and place it for 1-2 h after spraying evenly. Finally, lay the ferrite magnetic-enhanced asphalt concrete and use conventional compaction and cool it to room temperature to complete the laying of the charging unit; in step 3), after the middle part of the upper layer is laid, spread SBS modified asphalt on both sides of it, and normally lay the wear-resistant asphalt concrete on both sides of the road. After conventional compaction, place it for 2-4 h, and open the traffic after the temperature drops below 60 °C to obtain the road surface adapted to the dynamic wireless charging system.

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