CN209738831U

CN209738831U - Wireless charging module and wireless charging device of vehicle

Info

Publication number: CN209738831U
Application number: CN201920260946.XU
Authority: CN
Inventors: 尉晓东
Original assignee: Mag Magnetoelectrics Technology (zhuhai) Co Ltd
Current assignee: Mag Magnetoelectrics Technology (zhuhai) Co Ltd
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2019-12-06
Anticipated expiration: 2029-02-28

Abstract

The embodiment of the application provides a wireless charging module and a processing method thereof, and a wireless charging device of a vehicle, wherein the wireless charging module comprises: a coil; the shielding component is used for limiting the magnetic induction lines of the coil in the wireless charging module; wherein, shielding part includes outer shielding part, and the outside of coil is located to outer shielding part, and outer shielding part is used for reducing the leakage magnetic flux of wireless module of charging. After the wireless module of charging set up outer shielding portion, even park the skew and lead to transmitting coil and receiving coil unable alignment, also can reduce wireless charging device's magnetic leakage flux through outer shielding portion to improve coupling coefficient and transmission efficiency between transmitting module and the receiving module, and reduce the risk that magnetic leakage flux formed the vortex in external metal, improve charging efficiency, and when increasing a plurality of interior shielding portions and/or outer shielding portion, can save the cost. Through setting up this external shield portion, still make wireless charging device to the accuracy requirement that parks reduce, help realizing more free wireless charging.

Description

wireless charging module and wireless charging device of vehicle

[ technical field ] A method for producing a semiconductor device

The application relates to the technical field of wireless charging, in particular to a wireless charging device of a wireless charging module and a vehicle.

[ background of the invention ]

in recent years, new energy automobiles, especially electric automobiles, are rapidly developed under the action of factors such as technical promotion and policy support. The electric automobile has long charging time, and the rapid charging can be realized only by a professional charging device. In order to solve the problem of charging of the electric automobile, a wireless charging technology is introduced into the field of charging of the electric automobile. The automobile adopting the wireless charging function is not physically connected with the power supply and the automobile during charging, but realizes power supply through conversion of electromagnetic field energy, can quickly enter a charging state, and even can realize functions of charging and the like in the driving process of the automobile. Therefore, the wireless charging of the automobile is widely researched and popularized.

The wireless power supply generally adopts an electromagnetic induction mode, and the system basically comprises a transmitting end coil module and a circuit, and a receiving end coil module and a circuit. The transmitting end coil module and the receiving end coil module generally include coils, which can convert electric energy into magnetic energy. When the conversion energy is transmitted between the transmitting end coil and the receiving end coil, the magnetic flux between the two coils has the risk of leakage, the leaked magnetic flux generates an eddy current in an external metal medium to cause a safety risk, and meanwhile, the magnetic energy transmission efficiency between the transmitting end coil and the receiving end coil is low due to the leakage of the magnetic flux.

[ Utility model ] content

In view of this, embodiments of the present disclosure provide a wireless charging module and a wireless charging device for a vehicle, so as to solve the problems of low safety and low magnetic energy transmission efficiency caused by magnetic flux leakage between a transmitting end coil and a receiving end coil in the prior art.

The embodiment of the application provides a wireless charging device's wireless module of charging for the wireless charging of vehicle, wireless module of charging includes:

A coil;

The shielding component is used for limiting the magnetic induction lines of the coil in the wireless charging module so as to reduce the leakage magnetic flux of the wireless charging module;

Wherein, shielding part includes outer shielding part and/or internal shield, outer shielding part is located the outside of coil, internal shield locates the hole of coil.

Preferably, a plurality of the outer shielding parts are arranged on the outer side of the coil, and/or a gap is formed between every two adjacent outer shielding parts;

The hole of coil is provided with a plurality ofly interior shielding part, it is adjacent have the clearance between the interior shielding part.

Preferably, the outer shield portion includes an outer shield frame surrounding the coil.

Preferably, in the height direction H, the outer shield has a first upper end face, and the coil has a second upper end face;

along wireless charging module's direction of height H, first up end surpasss the second up end.

preferably, the shielding member further includes a lower shielding part provided at a lower end of the coil.

preferably, the shielding member includes a magnetic stripe made of amorphous metal and/or nanocrystalline metal.

preferably, the magnetic stripe comprises a plurality of shielding layers, and each shielding layer comprises an amorphous metal layer and/or a nanocrystalline metal layer;

The shielding layer is wound to form the magnetic strip.

Preferably, the shielding layer plane of the shielding layer in the shielding member is perpendicular to the plane of the coil.

Preferably, the thickness of the shielding layer is 10-30 μm.

Meanwhile, an embodiment of the present application further provides a wireless charging device for a vehicle, including:

A transmitting module;

The receiving module is arranged on the vehicle;

Wherein, at least one of the receiving module and the transmitting module is the wireless charging module. In this application, when this wireless module of charging set up outer shield portion and/or interior shield portion (especially the outer shield portion of multiunit and/or the interior shield portion of multiunit), because outer shield portion and/or interior shield portion magnetic conductivity are very high and the area is great, when receiving the module and squinting for the transmission module, the magnetism of transmission module is felt the line and can be got into in the shield member of predetermined receiving module, and finally get into and predetermine the magnetic path, reduce this wireless charging device's magnetic leakage flux, wireless charging device's anti offset ability has effectively been increased, and improve coupling coefficient and transmission efficiency between transmission module and the receiving module, reduce the risk that magnetic leakage flux formed the vortex in external metal, improve charging efficiency. Meanwhile, in the application, the reduction of the leakage magnetic flux in the wireless charging device is realized by arranging the outer shielding part and/or the inner shielding part according to the requirement instead of simply increasing the area of the conventional shielding part of the module, so that the use of shielding materials is reduced, the cost can be saved, and the weight of the wireless charging module is reduced. In addition, by arranging the shielding component, the requirement of the wireless charging device on the parking accuracy is reduced, and the wireless charging device is favorable for realizing more free wireless charging.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a DD coil arrangement shielding member provided in the present application;

FIG. 2 is a schematic diagram of a DDQ coil shielding component according to the present application;

FIG. 3 is a schematic structural diagram of a shield member provided to a BP coil according to the present application;

FIG. 4 is a schematic diagram of a circular coil arrangement of a shield member according to the present application;

FIG. 5 is a sectional view taken along line A-A of FIG. 4;

Fig. 6 is a schematic diagram of the magnetic induction line comparison before and after the external shielding part is arranged in the wireless charging device according to the present application;

FIG. 7 is a schematic structural view of the shielding member of FIGS. 1-3 in a first embodiment;

FIG. 8 is a schematic structural view of a shielding member of FIGS. 1-3 in a second embodiment;

FIG. 9 is a schematic structural view of a shielding member of FIGS. 1-3 in a third embodiment;

FIG. 10 is a schematic view of a fourth embodiment of the shielding member of FIGS. 1-3;

FIG. 11 is a schematic view of the structure of the shield member of FIG. 4;

FIG. 12 is a schematic view of the configuration of a magnetic stripe in a shield member in a first embodiment;

FIG. 13 is a schematic view of a second embodiment of a magnetic stripe in a shield member.

reference numerals:

1-a shielding member;

11-an inner shield;

111-a third upper end face;

12-an outer shield;

121-a first upper end face;

122-first lower end face;

13-a lower shield;

2-magnetic strip;

21-a shielding layer;

211-shield plane;

3-a coil;

31-inner bore;

32-a first portion;

33-a second part;

34-a third portion;

35-a second upper end face;

a-a transmitting module;

B-a receiving module.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

it should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

referring to fig. 1 to 13, fig. 1 is a schematic structural diagram of a shielding member for a DD coil provided in the present application; FIG. 2 is a schematic diagram of a DDQ coil shielding component according to the present application; FIG. 3 is a schematic structural diagram of a shield member provided to a BP coil according to the present application; FIG. 4 is a schematic diagram of a circular coil arrangement of a shield member according to the present application; FIG. 5 is a sectional view taken along line A-A of FIG. 4; fig. 6 is a schematic diagram of the magnetic induction line comparison before and after the external shielding part is arranged in the wireless charging device according to the present application; FIG. 7 is a schematic structural view of the shielding member of FIGS. 1-3 in a first embodiment; FIG. 8 is a schematic structural view of a shielding member of FIGS. 1-3 in a second embodiment; FIG. 9 is a schematic structural view of a shielding member of FIGS. 1-3 in a third embodiment; FIG. 10 is a schematic view of a fourth embodiment of the shielding member of FIGS. 1-3; FIG. 11 is a schematic view of the structure of the shield member of FIG. 4; FIG. 12 is a schematic view of the configuration of a magnetic stripe in a shield member in a first embodiment; FIG. 13 is a schematic view of a second embodiment of a magnetic stripe in a shield member.

the wireless charging device for the vehicle generally comprises two parts, namely a power supply part and a power receiving part, wherein the power supply part comprises an alternating current power supply, a rectification and power factor correction and power amplification circuit, a primary side tuning circuit and a transmitting module A, and the power receiving part comprises a receiving module B, a secondary side tuning circuit, a rectification and vehicle-mounted energy management circuit, a storage battery and the like. When the wireless charging device is charged, the power supply part and the power receiving part are close to each other, alternating current with certain frequency flows through the transmitting module A in the power supply part, an alternating magnetic field is generated around the transmitting module A under the action of electromagnetic induction, and when the receiving module B is positioned in the alternating magnetic field, induction current can be generated in the receiving module B, so that electric energy is transferred to the power receiving part from the power supply part, and wireless charging is realized.

however, all the magnetic induction lines generated by the transmitter module a do not pass through the receiver module B, and therefore, the magnetic flux that does not pass through both the transmitter module a and the receiver module B is called leakage flux. Obviously, the leakage magnetic flux cannot generate an induced current in the receiving module B because of not passing through the receiving module B, so that the magnetic energy transmission efficiency between the transmitting module a and the receiving module B is low. Meanwhile, the leakage flux generates eddy current when passing through an external metal medium, which causes safety risk.

As shown in fig. 6a, in the charging process, when the transmitting module a and the receiving module B are aligned (the coupling coefficient of the transmitting module a and the receiving module B is high), the leakage magnetic flux between the transmitting module a and the receiving module B is small, the transmission efficiency of the magnetic flux between the transmitting module a and the receiving module B is high, and the risk that the leakage magnetic flux generates eddy current in the external metal medium can be reduced. However, in practical situations, there is a problem that the receiving module B is shifted relative to the transmitting module a due to the parking shift, as shown in fig. 6B, at this time, the leakage magnetic flux between the transmitting module a and the receiving module B is large, which is not favorable for magnetic energy transmission, and has a high safety risk.

In the prior art, in order to realize sufficient transmission power, a method of increasing the area of the transmitting module a or increasing the input voltage is generally adopted, but the two methods have high cost, and when the area of the transmitting module a is increased, the weight of the transmitting module a is large, which is not beneficial to light weight.

In this application, reduce emission module A and connect the magnetic leakage flux between the module B through addding outer shield to improve transmission efficiency and security.

Specifically, the present application provides a wireless charging module of a wireless charging device, which is used for wireless charging of a vehicle, and at least one of a transmitting module a and a receiving module B of the wireless charging device employs the wireless charging module described in the present application. Wherein, as shown in fig. 1-3, the wireless charging module comprises: and a coil 3, wherein when the wireless charging module is used as a transmitting module A, alternating current is introduced into the coil 3 to form an alternating magnetic field, and when the wireless charging module is used as a receiving module B, induced current can be generated in the coil 3. Meanwhile, the wireless charging module further comprises a shielding component 1, and the shielding component 1 is used for limiting the magnetic induction line in the wireless charging device.

normally, the material of the shielding member 1 is soft magnetic ferrite, and the material has a different magnetic permeability from air, and when the shielding member 1 and air are both in an induced magnetic field, the magnetic permeability changes abruptly at the interface (surface of the shielding member 1) between the two, and the magnetic induction lines are strongly converged in the material with the higher magnetic permeability, thereby forming magnetic shielding at the shielding member 1.

as shown in fig. 1 to 6, the shielding member 1 includes an outer shielding portion 12 and/or an inner shielding portion 11, the outer shielding portion 12 is disposed on an outer side of the coil 3, the inner shielding portion 11 is disposed in an inner hole of the coil 3, and the outer shielding portion 12 and/or the inner shielding portion 11 are used for reducing leakage flux of the wireless charging module.

in this application, when this wireless charging module set up outer shield 12 and/or interior shield 11 (especially multiunit outer shield 12 and/or multiunit interior shield 11), compare fig. 6B and fig. 6c and know, because outer shield 12 and/or interior shield 11 magnetic permeability is very high and the area is great, when receiving module B squints for transmitting module a, transmitting module a's magnetism induction line can get into in predetermined receiving module B's shielding part 1, and finally get into predetermined magnetic path, reduce this wireless charging device's magnetic leakage flux, wireless charging device's anti-excursion ability has effectively been increased, and improve coupling coefficient and transmission efficiency between transmitting module a and the receiving module B, reduce the risk that magnetic leakage flux formed the vortex in the external metal, improve charging efficiency. Meanwhile, in the application, the reduction of the leakage magnetic flux in the wireless charging device is realized by arranging the outer shielding part 12 and/or the inner shielding part 11 according to needs instead of simply increasing the area of the conventional shielding part of the module, so that the use of shielding materials is reduced, the cost can be saved, and the weight of the wireless charging module is reduced. In addition, by arranging the shielding component 1, the requirement of the wireless charging device on parking accuracy is reduced, and the wireless charging device is beneficial to realizing more free wireless charging. Further, in the present application, a plurality of outer shields 12 are disposed outside the coil 3, and/or a gap is provided between adjacent outer shields 12; the inner bore of the coil 3 is provided with a plurality of inner shields 11 with gaps between adjacent inner shields 11.

Therefore, in the present embodiment, the coverage area of the shielding member 1 can be further increased, so as to further reduce the leakage magnetic flux of the wireless charging module, and the material usage amount of the shielding member 1 can be further reduced by providing the space between the adjacent outer shielding portions 12 and the space between the adjacent inner shielding portions 11, so as to reduce the cost and the weight of the wireless charging module.

in the application, the wireless charging module is an original piece for realizing mutual conversion between electric energy and magnetic energy in a wireless charging system of an electric automobile, and generally comprises a high-conductivity component (coil 3) and a high-permeability component (shielding component 1), wherein the high-conductivity component is a conductor of the electric energy, and is formed by winding a copper wire or a litz wire, and the high-permeability component is a carrier of the magnetic energy and forms a part of a magnetic circuit, so that the coupling coefficient between a transmitting module A and a receiving module B can be improved, the eddy current loss caused by a magnetic field in a metal component in the automobile is reduced, and the power density of the wireless charging device is enhanced.

It should be noted that the high conductivity component (coil 3) may be various types of coils commonly used in the art, including a circular coil, a DD coil, a DDQ coil, and a BP coil, where the circular coil is a circular structure formed by winding a metal wire, and has an advantage of simple winding; as shown in fig. 1, the DD coil is formed by two toroidal coils (a first portion 32 and a second portion 33) connected in series in opposite directions, and is capable of generating magnetic fields in opposite directions, and has a coupling coefficient and a loss larger than those of the toroidal coils; as shown in fig. 2, a Q coil (third portion 34) is added to a DD coil (including a first portion 32 and a second portion 33), the Q coil and the DD coil are orthogonal to each other and generate magnetic fields without mutual influence, the Q coil and the DD coil respectively output voltages, and the voltages output by the Q coil and the DD coil are rectified and then connected in parallel. The BP coil is formed by two loop coils (a first part 32 and a second part 33) which are connected in series in an interlaced and inverted manner, and the mutual inductance between the two loop coils is zero, and the two loop coils do not influence each other.

The above is only a part of the embodiments of the coil 3 in the present application, and the coil 3 may also be other coils 3 in the field as long as the electromagnetic induction can be realized to generate the induction current.

Specifically, as shown in fig. 1 to 5, the outer shield 12 includes one or more outer shield frames capable of surrounding the coil 3 from the outside.

In this embodiment, when the outer shielding part 12 is a closed outer shielding frame structure, the coil 3 can be shielded from all directions, so that the leakage flux of the coil 3 in all directions can be reduced, the transmission efficiency of the wireless charging module is further improved, and the eddy current loss is reduced.

Of course, the outer shield member 12 does not necessarily have to be a closed structure surrounding the coil 3, and may be provided as needed, for example, in fig. 1 to 3, when the leakage magnetic flux is large at both ends of the coil 3 in the longitudinal direction L and when no or small leakage magnetic flux is present at both ends in the width direction W, the outer shield 12 may be added only to both ends of the coil 3 in the longitudinal direction L, and the outer shield 12 is not required to be provided at both ends in the width direction W. At this time, the shielding member 1 can still effectively reduce the leakage magnetic flux of the wireless charging module.

in order to further reduce the leakage flux of the wireless charging module, the external shielding part 12 may further include a plurality of external shielding frames, and as shown in fig. 1 to 3, two layers of external shielding frames are disposed outside the coil 3.

in addition, fig. 1 shows a DD coil, fig. 2 shows a DDQ coil, fig. 3 shows a BP coil, and when the outer shield 12 of the three types of coils 3 is a closed outer shield frame, the outer shield frame has a rectangular shape that fits the outer contour of the coil 3. Fig. 4 and 5 show a circular coil, and when the outer shield 12 of the circular coil is a closed outer shield frame, the shield member of the circular coil is as shown in fig. 11, and the outer shield frame has a circular shape adapted to the outer contour of the coil 3, and the outer shield frame having the shape can reduce the area occupied by the outer shield 12 while reducing the leakage flux.

The outer shielding part 12 can reduce the leakage magnetic flux outside the wireless charging module, and meanwhile, the shielding component 1 can further include an inner shielding part 11, as shown in fig. 1 to 11, the shielding component 1 further includes the inner shielding part 11, and the inner shielding part 11 is disposed in the inner hole 31 of the coil 3.

in the DD coil shown in fig. 1, the first portion 32 and the second portion 33 are connected in series, and the first portion 32 and the second portion 33 are both annular coils, and therefore, both have the inner hole 31, and when the magnetic induction wire is transmitted in the inner hole 31, there is a risk of leakage, and therefore, in the present embodiment, the inner shield 11 is provided in the inner holes 31 of both the annular coils, so that leakage flux of magnetic energy when the magnetic energy is transmitted in the inner hole 31 is reduced.

in the DDQ coil shown in fig. 2, the first portion 32 and the second portion 33 both have inner holes 31, and after the third portion 34 is orthogonal to the first portion 32 and the second portion 33, the inner holes 31 are also formed between the third portion and the first portion 32 and the second portion 33, that is, 4 inner holes 31 can be formed in the coil 3, and when magnetic induction lines are transmitted in each inner hole 31, there is a risk of leakage, therefore, in the present embodiment, the inner shielding part 11 is provided in each inner hole 31 of the coil 3, so that leakage flux of magnetic energy when the magnetic energy is transmitted in the inner holes 31 is reduced.

In the BP coil shown in fig. 3, the first portion 32 and the second portion 33 both have the inner hole 31, and the inner hole 31 is formed between the first portion 32 and the second portion 33 after the first portion 32 and the second portion 33 are interlaced, and the size of the inner hole 31 varies according to the relative position of the first portion 32 and the second portion 33, and when the inner hole 31 formed between the first portion 32 and the second portion 33 is large, the inner shield 11 may be disposed in the inner hole 31.

For a circular ring coil, as shown in fig. 4 and 11, a circular inner hole is formed in the middle of the circular ring coil, in order to reduce the leakage flux when the magnetic induction line is transmitted in the inner hole, the circular inner hole is provided with an inner shielding part 11, and the inner shielding part 11 is circular in shape matching with the shape of the inner hole. Therefore, in the coil 3, the inner shield 11 and the outer shield 12 may have a concentric structure.

Further, as shown in fig. 1 to 3, the shield member 1 further includes a lower shield portion 13, the lower shield portion 13 is located at a lower end of the coil 3 in the height direction H, that is, the lower shield portion 13 is located outside the coil 3, and the lower shield portion 13 has a high magnetic permeability and is used for realizing magnetic shielding of the coil 3.

It should be noted that, as shown in fig. 6, the distribution direction of the transmitting module a and the receiving module B is defined as the height direction H of the wireless charging module, and meanwhile, along the height direction H, one end of the transmitting module a close to the receiving module B is the "upper end", one end of the transmitting module a far away from the receiving module B is the "lower end", and similarly, one end of the receiving module B close to the transmitting module a is the "upper end", and one end of the receiving module B far away from the transmitting module a is the "lower end". Therefore, the opposite ends of the transmitting module a and the receiving module B are both "upper ends", and the ends far away from each other are both "lower ends". For this reason, "upper end surface" and "lower end surface" described below are defined in the same manner.

In the wireless charging module of the prior art, the lower shielding part 13 is usually also included, as shown in fig. 6a and 6B, and the lower shielding part 13 is located outside the coil 3, so that the magnetic induction line can be limited between the lower shielding parts 13 of the transmitting module a and the receiving module B. However, the shield member 1 in the related art does not include the outer shield portion 12 and the inner shield portion 11, and therefore, when the parking is deviated, there is a leakage flux between the transmitter module a and the receiver module B, and in order to reduce the leakage flux, it is generally adopted to increase the area of the lower shield portion 13. In the present application, the outer shield 12 is added to the outside of the coil 3, and the inner shield 11 is added to the inside of the coil 3, so that the leakage magnetic flux between the transmitting module a and the receiving module B can be effectively reduced when the transmitting module a and the receiving module B are offset.

specifically, as shown in fig. 6c, in the height direction H of the wireless charging module, the outer shielding part 12 has a first upper end surface 121 and a first lower end surface 122 which are oppositely arranged, the coil 3 has a second upper end surface 35 and a second lower end surface, the inner shielding part 11 has a third upper end surface 111 and a third lower end surface which are oppositely arranged, and the lower shielding part 13 has a fourth upper end surface and a fourth lower end surface which are oppositely arranged.

Along the height direction H, as shown in fig. 6c, in the wireless charging module, the lower shielding part 13 is mounted on the third lower end surface of the coil 3, the inner shielding part 11 is located in the inner hole of the coil 3, the outer shielding part 12 is located outside the coil 3, and both the third lower end surface of the inner shielding part 11 and the first lower end surface 122 of the outer shielding part 12 can be flush with the lower end surface of the lower shielding part 13, and simultaneously, both the upper end surface 111 of the inner shielding part 11 and the upper end surface 121 of the outer shielding part 12 exceed the second upper end surface 35 of the coil 3.

therefore, in the wireless charging apparatus, along the height direction H, the distance between the two outer shielding portions 12 in the transmitting module a and the receiving module B is smaller than the distance between the two coils 3, the distance between the two inner shielding portions 11 is smaller than the distance between the two coils 3, and the smaller the distance between the two inner shielding portions 11 and the distance between the two outer shielding portions 12 is, the higher the coupling coefficient between the transmitting module a and the receiving module B is, and the higher the transmission efficiency between the transmitting module a and the receiving module B is.

meanwhile, in the shielding member 1 in the present application, the inner shielding portion 11, the outer shielding portion 12, and the lower shielding portion 13 are of a split structure, that is, the three portions are relatively independent, can be separately processed, and are respectively mounted on the coil 3.

Of course, the inner shielding part 11, the outer shielding part 12 and the lower shielding part 13 may also be of an integral structure, and it is satisfied that the inner shielding part 11 and the outer shielding part 12 protrude upward relative to the lower shielding part 13.

In the above embodiments, when the coil 3 is a DD coil, a DDQ coil, or a BP coil, the structure of the shielding member 1 is as shown in fig. 7 to 10, wherein in the shielding member 1, the outer shielding portion 12 is a closed outer shielding frame, the lower shielding portion 13 is a strip-shaped structure, and the inner shielding portion 11 is a closed inner shielding frame or a strip-shaped structure.

As shown in fig. 7 and 8, when the inner shield 11 and the lower shield 13 are in the same plane, the lower shield 13 is cut at a position where the inner shield 11 is provided, so as to avoid the inner shield 11. As shown in fig. 8 and 9, when the inner shield 11 and the lower shield 13 are not in the same plane, that is, when the inner shield 11 is located above or below the lower shield 13, the lower shield 13 has a complete structure, and the two are spatially offset.

On the other hand, as in the embodiment shown in fig. 7 and 9, in which the inner shield 11 has a strip-like structure, the structure in this embodiment can be adopted when the size of the inner hole 31 of the coil 3 is small. In the embodiment shown in fig. 7 and 9, the inner shield 11 is one or more closed inner shield frames, and when the size of the inner hole 31 of the coil 3 is large, the structure of the embodiment may be adopted, and the size and number of the inner shield frames may be set according to the size of the inner hole 31.

as shown in fig. 4 and 11, when the coil 3 is a circular coil, the inner shield 11 and the outer shield 12 are concentric circular structures, the lower shield 13 is a strip-shaped structure, and the lower shields 13 are distributed along the diameter direction of the circular coil 3.

For the wireless charging device of the electric vehicle, the transmitting module a and the receiving module B not only have a high coupling coefficient, but also have a low eddy current loss, and since the soft magnetic ferrite material has a low loss at 100kHz, in the prior art, the lower shielding part is usually made of ferrite material, that is, the inner shielding part 11, the outer shielding part 12 and the lower shielding part 13 in the above embodiments can all be made of ferrite material.

however, the saturation magnetic induction of the ferrite is low, generally only 0.4 to 0.5T, and in order to make the lower shield 13 unsaturated at the time of high power and high magnetic induction, the lower shield 13 needs to have a large volume, which results in a large weight of the wireless charging module, and is not favorable for realizing light weight. The saturation magnetic induction refers to a phenomenon that magnetic flux generated when input alternating current is increased to a certain value is not increased any more, and when the saturation magnetic induction of the coil is reached, the wireless charging module is easy to generate heat.

Consequently, in this application, under the prerequisite that guarantees that wireless charging module has great saturation magnetic induction, the volume of the wireless module that charges of minimizing is mainly realized through adopting the great material of saturation magnetic induction.

Specifically, in each of the above embodiments, the inner shield part 11, the outer shield part 12, and the lower shield part 13 in the shield member 1 may each include one or more magnetic stripes 2, and the magnetic stripes 2 may be amorphous metal and/or nanocrystalline metal, where amorphous and nanocrystalline are two states in which metal is located.

During the preparation process of the metal, the metal is in a process of naturally cooling and slowly solidifying from a liquid state to a solid state, atoms are automatically and regularly rearranged in the process, and the formed structure is a crystal and is actually a polycrystalline structure. If the liquid metal is cooled at an ultra-fast cooling speed in the solidification process, atoms are in a disordered state and are frozen instantly without being rearranged, and the formed structure is amorphous. The nanocrystalline is formed by forming metal crystal nucleus and growing up through special heat treatment on the basis of amorphous state, and controlling the size of crystal grain at nano level.

compared with the ferrite in the prior art, the ferrite has the advantages that the saturation magnetic induction intensity of the amorphous metal and the nanocrystalline metal is 1.2-1.7T and is far higher than 0.4-0.5T of the ferrite when the loss is 100 kHz. Meanwhile, the magnetic permeability, the excitation current and the iron loss of the amorphous metal and the nanocrystalline metal are small. In addition, the nanocrystalline can also realize directional control of magnetic conductivity and an anti-saturation magnetic field, the magnetic conductivity of the nanocrystalline can be adjusted within 1000-30000, and the adjustable anti-saturation magnetic field can reach 30-350A/m, so that the nanocrystalline can also realize special design besides the advantages and has high applicability.

in this application, when shielding part 1 adopted amorphous metal and/or nanocrystalline metal, compare with adopting traditional ferrite material, under the same volume, can improve shielding part 1's saturation induction intensity greatly to help reducing shielding part 1's volume, compare in current ferrite shielding part 1, shielding part 1's volume can reduce more than half when adopting the nanocrystalline, thereby reduces the weight of this shielding part 1 and wireless charging module. Simultaneously, the magnetic permeability of nanocrystalline is 5 ~ 15 times higher than the ferrite to can further reduce the volume and the weight of wireless module of charging.

the amorphous metal can be iron-based amorphous alloy, iron-nickel-based amorphous alloy and the like, and the iron-based amorphous alloy comprises the following components: mainly contains iron element, and small amount of Si, B, etc. is added. The nanocrystalline metal can be an iron-based nanocrystalline alloy or the like, and for the iron-based nanocrystalline alloy, the composition is as follows: mainly iron element, and a small amount of Nb, Cu, Si, B, etc. is added. Of course, other types of amorphous metals, nanocrystalline metals, may also be employed.

specifically, as shown in fig. 12 and 13, the magnetic stripe 2 forming the shielding member 1 includes a plurality of shielding layers 21, each shielding layer 21 is an amorphous layer and/or a nanocrystalline layer, and each shielding layer 21 is wound to form the magnetic stripe 2.

In the embodiment shown in fig. 12, the magnetic stripe 2 has a racetrack configuration, in the embodiment shown in fig. 13, the magnetic stripe 2 has an oval configuration, and the shielding layers 2 in the magnetic stripe 2 may also have an unsealed configuration, for example, the magnetic stripe 2 may be a part of fig. 12. In the present application, the specific structure and shape of the magnetic stripe 2 are not limited as long as the shielding member 1 can be formed.

More specifically, the thickness of the shielding layer 21 is 10 to 30 μm, for example, 20 μm. When the thickness of the shielding layer 21 is small, the eddy current generated in the shielding layer 21 is small, so that the eddy current loss of the shielding member 1 in the wireless charging module can be reduced.

More specifically, as shown in fig. 4 and 5, taking a circular coil as an example, the shielding layer plane 211 where the shielding layer 21 of each shielding member in the shielding member 1 is located is perpendicular to the plane where the coil 3 is located. The "shielding layer plane 211" refers to a plane on which the shielding layer 21 of the inner shield 11, the outer shield 12, and the lower shield 13 is located, as shown in fig. 5, the shielding layer plane 211 is perpendicular to the length direction L, and the "plane on which the coil 3 is located" refers to a plane on which the winding direction of the coil 3 is located, as shown in fig. 5, the plane on which the coil 3 is located is perpendicular to the height direction H, and therefore, the shielding layer plane 211 is perpendicular or substantially perpendicular to the plane on which the coil 3 is located.

With this arrangement, by making the magnetic induction lines of the coil 3 parallel or approximately parallel to the plane in which the shield layer 21 is located so that the magnetic induction line direction in the shield layer 21 is parallel to the winding direction of the coil 3, the eddy current generated in the shield member 1 is confined within the shield layer 21, thereby further reducing the eddy current loss of the shield member 1.

In conclusion, in this application, through add outer shielding part 12 in coil 3 to set up outer shielding part 12 into the structure of amorphous and/or nanocrystalline material, make this wireless charging module leakage magnetic flux less, thereby make to have higher coupling coefficient between wireless charging device's emission module A and the absorption module B, improve charge efficiency. Meanwhile, the shielding component 1 of the wireless charging module also has large saturation magnetic induction intensity, so that the size and the weight of the wireless charging module can be reduced, and the light weight is facilitated to be realized. In addition, the shielding layer 21 in the shielding member 1 is perpendicular to the plane of the coil 3, which can play a role of suppressing eddy current, thereby reducing the eddy current loss of the wireless charging module.

A transmitting module A;

the receiving module B is arranged on the vehicle;

Wherein at least one of the receiving module B and the transmitting module a is the wireless charging module described in any of the above embodiments.

Since the wireless charging module has the above technical effects, the wireless charging device including the wireless charging module also has corresponding technical effects, which are not described herein again.

In addition, in the wireless charging device, the transmitting module a is located outside the vehicle, and therefore, the requirements on the volume and the weight are not strict, and therefore, when the wireless power generating module is used for the transmitting module a, the shielding member 1 can adopt a conventional ferrite material, so as to reduce the cost. When the transmitting module a and the receiving module B are both provided with the outer shielding members 12, as shown in fig. 6c, the outer shielding members 12 of the transmitting module a and the receiving module B are matched with each other, so that the wireless power generation device has higher anti-offset capability.

In addition, an embodiment of the present application further provides a method for processing a wireless charging module, where the wireless charging module is the wireless charging module described above, and the method for processing the wireless charging module includes the following steps:

The processing method includes the following steps S11: an outer shield 12 is mounted on the outside of the coil 3 and/or an inner shield 11 is mounted in the bore 31 of the coil 3.

as described above, by attaching the outer shield 12 to the outside of the coil 3 and/or attaching the inner shield 11 to the inner hole 31 of the coil 3, the offset resistance of the wireless charging module can be improved and the leakage flux thereof can be reduced.

meanwhile, the shielding member 1 further includes a lower shielding portion 13, and therefore, the above steps are specifically S11: an outer shield 12 is mounted on the outside of the coil 3, an inner shield 11 is mounted in an inner bore 31 of the coil 3, and a lower shield 13 is mounted at the lower end of the coil 3.

it is understood that, in step S11, the sequence of installing the outer shield 12, installing the inner shield 11, and installing the lower shield 13 is not strict, and may be arbitrarily selected according to actual circumstances.

Specifically, the inner shield part 11, the outer shield part 12 and the lower shield part 13 of the shield member 1 comprise one or more magnetic strips 2, and the magnetic strips 2 comprise a multi-layer shield layer 21, wherein the shield layer 21 is an amorphous layer and/or a nanocrystalline layer.

Based on this configuration, before step S11, the method further includes the steps of:

S101: and winding the shielding layer 21 on the die, and stopping when the wound thickness reaches the preset thickness.

The mold in this step can be selected according to actual conditions, and the thickness of the shielding layer 21 can also be selected according to actual conditions.

s102: the wound shielding member 1 is cured.

when curing, the epoxy resin can be used for impregnation curing.

Further, the following step S111 may be further included between steps S101 and S102: the heat treatment is performed on the wound shielding member 1, and the heat treatment process is performed in vacuum or nitrogen or argon, so that the heat-treated shielding member 1 can be prevented from being oxidized.

Specifically, when the shielding layer 21 is an amorphous layer, the heat treatment temperature is 350-450 ℃, the preset time is 0.5-5 h, and the stress in the amorphous layer can be eliminated or reduced after the heat treatment; the amorphous state has good processing performance, the nanocrystalline layer is in the amorphous state before forming, the amorphous state material is wound and fixed and then is subjected to heat treatment, the heat treatment temperature is 500-600 ℃, and when the preset time is 0.5-5 hours, the amorphous layer can be in the nanocrystalline state and then is subjected to dipping and fixing.

taking a wireless charging module comprising a circular coil as an example, the processing method comprises the following steps:

(1) A racetrack-shaped strip magnet 2 is wound on a flat die by an amorphous layer (with the width of 10mm) of 1k107B (model) with the thickness of 18-20 mu m, wherein the width of the die is 140mm, the thickness of the die is 1mm, and the single-side winding thickness of the die is 5 mm.

(2) The circular ring-shaped magnet is wound by using a circular die, and the material specification is the same as above. The diameter of the die is 400mm, the single-side winding thickness is 5mm, and an outer shielding part 12 is formed;

(3) the circular ring-shaped magnet is wound by using a circular die, and the material specification is the same as above. The diameter of the die is 80mm, the single-side winding thickness is 5mm, and an inner shielding part 11 is formed;

(4) fixing the magnetic strips 2 by using a clamp, and then carrying out heat treatment at the high temperature of 500-600 ℃, wherein the heat treatment process is carried out in vacuum or nitrogen or argon atmosphere, and the heat treatment time is 0.5-5 h;

(5) after the magnetic stripe 2 after heat treatment is impregnated and cured by epoxy resin, the clamp is removed;

(6) Combining the magnetic strips 2 in the 6 steps (1), the magnetic strips 2 in the 1 step (2) and the magnetic strips 2 in the 1 step (3) to form a shielding component 1 shown in fig. 12;

(7) winding a 0.08mm multiplied by 2500 strand covered wire (the diameter is 5.6mm) to form a circular ring-shaped coil, wherein the inner diameter is 180 mm;

(7) The annular coil is fixed to the shield member 1 with epoxy resin.

the above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. Wireless charging device's wireless module of charging for the wireless charging of vehicle, wireless module of charging includes:

A coil;

2. The wireless charging module according to claim 1, wherein a plurality of the outer shields are disposed outside the coil, and/or a gap is formed between adjacent outer shields;

3. The wireless charging module of claim 1, wherein the outer shield comprises an outer shield frame that surrounds the coil.

4. The wireless charging module of claim 1, wherein the outer shield has a first upper end surface and the coil has a second upper end surface along a height direction H of the wireless charging module;

5. The wireless charging module of claim 1, wherein the shielding member further comprises a lower shielding portion, and the lower shielding portion is disposed at a lower end of the coil.

6. the wireless charging module according to any one of claims 1 to 5, wherein the shielding member comprises a magnetic strip, and the magnetic strip is made of amorphous metal and/or nanocrystalline metal.

7. The wireless charging module of claim 6, wherein the magnetic strip comprises a plurality of shielding layers, each of the shielding layers comprising an amorphous metal layer and/or a nanocrystalline metal layer;

The shielding layer is wound to form the magnetic strip.

8. the wireless charging module of claim 7, wherein a plane of the shielding layer of the shielding member is perpendicular to a plane of the coil.

9. the wireless charging module of claim 7, wherein the thickness of the shielding layer is 10-30 μm.

10. A wireless charging device for a vehicle, comprising:

A transmitting module;

The receiving module is arranged on the vehicle;

wherein, at least one of the receiving module and the transmitting module is the wireless charging module of any one of claims 1-9.