CN111180173A

CN111180173A - Wireless charging coil and wireless charging device

Info

Publication number: CN111180173A
Application number: CN201811331559.7A
Authority: CN
Inventors: 戴飞; 林阳; 林涛; 王劲
Original assignee: Suzhou Lanpei Wireless Communication Technology Co ltd
Current assignee: Suzhou Lanpei Wireless Communication Technology Co ltd
Priority date: 2018-11-09
Filing date: 2018-11-09
Publication date: 2020-05-19

Abstract

The invention discloses a wireless charging coil and a wireless charging device, wherein the coil is formed by winding a winding wire and at least comprises a first coil unit, a second coil unit and a third coil unit, wherein one part of the winding wire is wound from inside to outside along a first direction; the second coil unit is formed by winding the other part of the winding wire from inside to outside along a second direction, and the second coil unit and the first coil unit form a double-layer stacked structure; the first direction is opposite to the second direction, and two end sides of the winding wire are respectively used as two outer outgoing wires of the coil. The coil formed by the winding mode can avoid the occurrence of wire jumping, and reduce the processing difficulty of products and subsequent procedures.

Description

Wireless charging coil and wireless charging device

Technical Field

The invention relates to the field of wireless charging, in particular to a wireless charging coil and a wireless charging device.

Background

Wireless charging technology (Wireless charging technology) is derived from Wireless power transmission technology and can be divided into two modes of low-power Wireless charging and high-power Wireless charging. Wherein, the low-power wireless charging usually adopts an electromagnetic induction type, such as a Qi mode for charging a mobile phone; the high-power wireless charging usually adopts a resonant mode, and the power supply equipment (charger) transmits energy to a device for power utilization, the device charges a battery by using the received energy and simultaneously provides the battery for self operation, and most electric vehicles are charged in the mode. Because the charger and the electric device transmit energy through the magnetic field and are not connected through wires, the charger and the electric device can be exposed without conductive contacts, and the wireless charging technology is widely applied to daily life and becomes a very important technology in modern life.

In wireless charging based on electromagnetic induction, a quality factor (Q factor) of a wireless charging coil is a key factor affecting charging efficiency, and the higher the quality factor is, the lower the proportion of power loss is, that is, the higher the charging efficiency is. Quality factor of wireless charging coil can be related to the impedance and the inductance of wireless charging coil, however in order to reduce the resistance of wireless charging coil to promote the inductance of wireless charging coil, wireless charging coil generally can need to use the great, thicker wire of diameter, and this causes the required area of wireless charging coil to increase, and this not only can increase wireless charging device's size, also lets the process of preparation become more complicated moreover.

In addition, traditional individual layer wireless charging coil is qualified for the next round of competitions because of the winding structure has interior and is qualified for the next round of competitions outward, and the wireless charging coil outside has the wire jumper to produce when being qualified for the next round of competitions in drawing out, has increased product and the next procedure degree of difficulty.

Disclosure of Invention

In view of the above drawbacks of the prior art, an object of the present invention is to provide a wireless charging coil and a wireless charging device, which are used to solve the problems of low charging efficiency, large size and large processing difficulty of a wireless charging device caused by a small quality factor Q of the wireless charging coil in the prior art.

To achieve the above and other related objects, the present invention provides a wireless charging coil, comprising:

a first coil unit formed by winding one end side of a winding wire from the inside to the outside in a first direction; and

the second coil unit is formed by winding the other end side of the winding wire from inside to outside along a second direction, and the second coil unit and the first coil unit form a double-layer stacked structure;

the first direction is opposite to the second direction, and two end sides of the winding wire are respectively used as two outer outgoing wires of the coil unit.

In one implementation manner of the present invention, the first outgoing line and the first coil unit are in the same plane; the second external outgoing line and the second coil unit are positioned on the same plane.

In one implementation of the present invention, the number of winding turns of the first coil unit is not equal to the number of winding turns of the second coil unit.

In one implementation of the invention, the absolute value of the difference between the number of winding turns of the first coil unit and the number of winding turns of the second coil unit comprises one turn.

In one implementation manner of the present invention, the wireless charging coil is a hollow ring structure.

In one implementation of the present invention, the outer edge shape of the wireless charging coil and the shape of the hollow part include one of a semicircle, a circle, an ellipse, a polygon, and a melon seed shape.

In one implementation manner of the present invention, the first coil unit and the second coil unit are both tightly wound structures.

In one embodiment of the invention, the winding wires are fixed to each other by self-bonding.

In one implementation manner of the present invention, the wireless charging coil further includes a shielding layer disposed on at least one end surface of the wireless charging coil.

In one implementation manner of the present invention, the winding wire is composed of at least one N insulated wires and a self-adhesive layer, the self-adhesive layer covers the surfaces of the insulated wires, and the insulated wires are arranged in parallel on the same plane.

In one embodiment of the present invention, in the first coil unit, the at least one N insulated wires of the winding wire are each wound in a first plane, and in the second coil unit, the at least one N insulated wires of the winding wire are each wound in a second plane, wherein the first plane and the second plane are parallel to each other.

In one embodiment of the invention, in the first coil unit, the at least one N insulated wires of the winding wire are each wound in at least one plane parallel to one another, and in the second coil unit, the at least one N insulated wires of the winding wire are each wound in at least one other plane parallel to one another, wherein the at least one plane in the first coil unit and the at least one other plane in the second coil unit are parallel to one another.

In one implementation manner of the present invention, end portions of the first and second external outgoing lines are subjected to a wicking process so that the insulated conductive wires are electrically connected to each other at the end portions of the first and second external outgoing lines.

In one implementation of the invention, the diameter of the insulated wire is between 0.04mm and 0.7 mm.

The invention also provides a wireless charging device which comprises a shell and at least one wireless charging coil arranged in the shell.

The coil formed by the winding mode can ensure that two outgoing lines of the coil are both outgoing lines, thereby avoiding the occurrence of jumper wires and reducing the difficulty of products and subsequent procedures;

in addition, the single-stranded wire with the same total cross section is replaced by the multi-stranded insulated wire, so that the skin effect can be reduced, the quality factor Q of the coil is improved, the proportion of power loss is reduced, and the efficiency of wireless charging can be improved;

moreover, by adopting the double-layer flat winding wire winding structure, the inductance is improved, the number of turns of the coil can be reduced, and the diameter of the coil is reduced, so that the size of the wireless charging device is reduced, the cost is saved, and the carrying is more convenient.

Drawings

Fig. 1 is a top view of a wireless charging coil according to the present invention.

Figure 2 shows a side view of a wireless charging coil of the present invention.

3 fig. 3 3 3 is 3 a 3 cross 3- 3 sectional 3 view 3 of 3 the 3 first 3 winding 3 type 3 of 3 the 3 wireless 3 charging 3 coil 3 of 3 the 3 present 3

invention

3, 3 taken 3 along 3 the 3 direction 3 a 3- 3 a 3 in 3 fig. 3 1 3. 3

Fig. 4 is a schematic structural diagram illustrating a first winding manner of the wireless charging coil according to the present invention.

3 fig. 3 5 3 is 3 a 3 sectional 3 view 3 of 3 the 3 wireless 3 charging 3 coil 3 of 3 the 3 present 3 invention 3 taken 3 along 3 the 3 direction 3 a 3- 3 a 3 in 3 fig. 3 1 3, 3 illustrating 3 the 3 structure 3 of 3 the 3 wireless 3 charging 3 coil 3 of 3 the 3 present 3 invention 3 in 3 the 3 second 3 winding 3 manner 3. 3

Fig. 6 is a schematic structural diagram illustrating a second winding manner in the wireless charging coil according to the present invention.

Fig. 7 is a top view of a wireless charging coil with a shielding layer disposed therein according to the present invention.

Figure 8 shows a side view of a wireless charging coil of the present invention with a shield disposed therein.

Figures 9-1 through 9-12 are diagrams illustrating different shapes of the wireless charging coil of the present invention, respectively.

Description of the element reference numerals

1 first coil unit

2 second coil unit

3 first outgoing line

4 second external outlet line

5 tin layer

6 winding wire

61 insulated wire

62 self-adhesive layer

7 Shielding layer

8 winding mold core

9 winding surface

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Please refer to fig. 1-9. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

As shown in fig. 1-6, the present invention provides a wireless charging coil, wherein fig. 1 is a top view of the wireless charging coil according to the present invention; figure 2 shows a side view of a wireless charging coil in accordance with the present invention; 3 fig. 3 3 3 and 3 5 3 are 3 two 3 different 3 cross 3- 3 sectional 3 views 3 along 3 a 3- 3 a 3 in 3 fig. 3 1 3, 3 corresponding 3 to 3 two 3 different 3 winding 3

patterns

3, 3 the 3 details 3 of 3 which 3 are 3 described 3 below 3. 3

As shown in fig. 1 and 2, the wireless charging coil at least comprises a first coil unit 1 formed by winding one end side of the winding wire 6 from inside to outside along a first direction; and a second coil unit 2 formed by winding the other end side of the winding wire 6 from the inside to the outside in a second direction, the second coil unit 2 and the first coil unit 1 forming a double-layer stacked structure; the first direction is opposite to the second direction, and two end sides of the winding wire 6 are used as two outer outgoing wires of the coil, namely, a first outer outgoing wire 3 and a second outer outgoing wire 4 in fig. 1.

Specifically, as shown in fig. 1 and 2, the first coil unit 1 and the second coil unit 2 are respectively located on two parallel planes, and a winding wire 6 is divided into two sections, a first section forms the first coil unit 1, a second section forms the second coil unit 2, that is, the two sections are of an integral structure, with a dividing point of the two sections as a starting point, two end sides of the winding wire 6 are respectively wound on the two parallel planes from inside to outside in different directions, that is, one end is wound clockwise/counterclockwise to form the first coil unit, the other end is wound counterclockwise/clockwise to form the second coil unit 2, and the two end parts lead out a first outgoing line 3 forming the first coil unit and a second outgoing line 4 forming the second coil unit 2, the first external outgoing line 3 and the first coil unit 1 are located on the same plane, and the second external outgoing line 4 and the second coil unit 2 are located on the same plane. Because the first coil unit 1 and the second coil unit 2 are of an integral structure, namely, no internal outgoing line exists, the internal outgoing line does not need to be led out along one end face of the first coil unit, the occurrence of wire jumping can be avoided, and the difficulty of products and subsequent processes is reduced.

In one embodiment, the winding wire on the end side of the first outgoing wire is wound on the first coil unit 1 from the outside to the inside in the first direction to form a third coil unit (not shown), and then is continuously wound on the third coil unit from the inside to the outside in the first direction to form a fourth coil unit (not shown), so that 2 stacked coil units can be formed on the first coil unit 1, and the outgoing wire can be ensured as the outgoing wire (first outgoing wire 1).

It is understood that, in another embodiment, the steps of forming the third coil unit and the fourth coil unit may be repeated continuously, and an even number of coil units, such as 4, 6, and 8, may be formed on the upper surface of the first coil unit 1, and the specific number may be adjusted as needed, which is not limited herein.

In an embodiment, the winding wire at the end side where the second external outgoing line is located is wound on the lower surface of the second coil unit 2 from the outside to the inside in the second direction to form a fifth coil unit (not shown), and then is continuously wound on the fifth coil unit from the inside to the outside in the second direction to form a sixth coil unit (not shown), so that 2 stacked coil units can be formed on the lower surface of the second coil unit 2, and meanwhile, the outgoing line is ensured to be an external outgoing line (i.e., the second external outgoing line 4).

It is understood that, in another embodiment, the steps of forming the fifth coil unit and the sixth coil unit may be repeated continuously, and an even number of more coil units, for example, 4, 6, and 8, may be formed on the lower surface of the second coil unit 2, and the specific number may be adjusted according to needs, which is not limited herein.

The number of winding turns of the first coil unit 1 and the second coil unit 2 may be equal or unequal. As shown in fig. 1, for example, when the wireless charging coil is horizontally disposed (taking a paper surface as a horizontal plane), taking the first coil unit 1 located on an upper layer and the second coil unit 2 located on a lower layer as an example, in order to prevent a portion of the winding wire 6 in the first coil unit 1 from being suspended, so as to fall off in a subsequent process, and to facilitate management and control of an external dimension of the wireless charging coil, a number of winding turns of the first coil unit 1 located on the upper layer in the wireless charging coil is not equal to a number of winding turns of the second coil unit 2 located on the lower layer, and generally, a number of winding turns of the first coil unit 1 located on the upper layer is smaller than a number of winding turns of the second coil unit 2 located on the lower layer.

As an example, the absolute value of the difference between the number of windings of the first coil unit 1 and the number of windings of the second coil unit 2 may be, for example, one winding, that is, the number of windings of the first coil unit 1 is one winding less than the number of windings of the second coil unit 2. Of course, the second coil unit 2 may be located at an upper layer, and the first coil unit 1 may be located at a lower layer, and the number of winding turns of the first coil unit 1 is one more than that of the second coil unit 2. The difference between the number of windings of the coil unit located at the lower layer and the number of windings of the coil unit located at the upper layer may be, for example, 1.5 turns, 2 turns, or the like, but is not limited thereto and may be adjusted as necessary.

As shown in fig. 1, the wireless charging coil has a hollow ring structure, and a magnetic core may be disposed in the hollow portion when the wireless charging coil is used to manufacture a wireless charging device. In fig. 1, as an example, the outer edge shape and the hollow portion of the wireless charging coil are circular, the outer diameter of the wireless charging coil is D, the inner diameter of the wireless charging coil is D, and the inner diameter D is the diameter of a winding shaft used when the wireless charging coil is wound. Fig. 9-1 to 9-12 are schematic diagrams of several shapes of the wireless charging coil of the present invention, and the shape of the outer edge and the hollow part of the wireless charging coil may be triangular as shown in fig. 9-1, square as shown in fig. 9-2, rectangular as shown in fig. 9-3, oval as shown in fig. 9-4, rounded rectangle as shown in fig. 9-5, pentagonal, hexagonal, heptagonal, octagonal as shown in fig. 9-6 to 9-9, circular as shown in fig. 1 (corresponding to fig. 1), semicircular as shown in fig. 9-11, melon seed as shown in fig. 9-12, and other ring structures, which are not limited to these examples, and may be any suitable ring structure according to the needs.

It should be noted that in the shapes shown in fig. 1, 2, 4 and 6, the number of winding turns is only illustrative and not intended to limit the present invention.

3 as 3 shown 3 in 3 fig. 3 3 3 and 3 fig. 3 5 3, 3 which 3 are 3 cross 3- 3 sectional 3 views 3 of 3 the 3 first 3 outgoing 3 line 3 3 3 along 3 the 3 direction 3 a 3- 3 a 3, 3 that 3 is 3, 3 cross 3- 3 sectional 3 views 3 of 3 the 3 winding 3 wire 3 6 3, 3 it 3 can 3 be 3 seen 3 that 3 the 3 winding 3 wire 3 6 3 is 3 composed 3 of 3 n 3 insulated 3 wires 3 61 3 and 3 a 3 self 3- 3 adhesive 3 layer 3 62 3, 3 the 3 self 3- 3 adhesive 3 layer 3 62 3 covers 3 the 3 surfaces 3 of 3 the 3 insulated 3 wires 3 61 3, 3 the 3 insulated 3 wires 3 61 3 are 3 arranged 3 in 3 parallel 3 on 3 the 3 same 3 plane 3, 3 and 3 the 3 first 3 insulated 3 wire 3 and 3 the 3 nth 3 insulated 3 wire 3 are 3 respectively 3 located 3 at 3 the 3 outermost 3 layers 3, 3 where 3 n 3 is 3 a 3 positive 3 integer 3 greater 3 than 3 or 3 equal 3 to 3 1 3, 3 that 3 is 3, 3 the 3 number 3 of 3 the 3 insulated 3 wires 3 61 3 may 3 be 3 one 3 or 3 more 3 ( 3 greater 3 than 3 or 3 equal 3 to 3 2 3) 3; 3 As an example, the winding wire 6 may be composed of 1 to 13 parallel strands of the insulated conductive wire 61, and of course, the winding wire 6 may be composed of more than 13 parallel strands of the insulated conductive wire 61.

The diameter of the insulated conducting wire 61 can be selected from 0.04 mm-0.7 mm, and a plurality of strands of insulated conducting wires 61 with smaller diameters are used for replacing single-stranded wires with the same total sectional area, so that negative effects caused by the skin effect can be reduced, the alternating current impedance of the wireless charging coil can be reduced, and the quality factor of the wireless charging coil is remarkably improved.

3 the 3 winding 3 wire 3 6 3 is 3 a 3 flat 3

wire

3, 3 and 3 the 3 winding 3 manner 3 of 3 the 3 winding 3 wire 3 6 3 includes 3 at 3 least 3 two 3 winding 3 manners 3 according 3 to 3 the 3 position 3 of 3 the 3 N 3 insulated 3 conductive 3 wires 3 61 3 in 3 the 3 winding 3 wire 3 6 3 in 3 the 3 first 3 coil 3 unit 3 1 3 and 3 / 3 or 3 the 3 second 3 coil 3 unit 3 2 3, 3 and 3 the 3 two 3 winding 3 manners 3 are 3 different 3 corresponding 3 to 3 the 3 sectional 3 view 3 along 3 the 3 a 3- 3 a 3 direction 3 in 3 fig. 3 1 3. 3

3 in 3 the 3 first 3 winding 3

manner

3, 3 as 3 shown 3 in 3 fig. 3 3 3, 3 a 3 cross 3- 3 sectional 3 view 3 along 3 a 3- 3 a 3 direction 3 in 3 fig. 3 1 3, 3 in 3 the 3 first 3 coil 3 unit 3 1 3, 3 the 3 n 3 insulated 3 conductive 3 wires 3 61 3 of 3 the 3 winding 3 wire 3 6 3 are 3 wound 3 in 3 a 3 first 3 plane 3 ( 3 i.e. 3, 3 a 3 plane 3 on 3 which 3 the 3 paper 3 surface 3 in 3 fig. 3 1 3 is 3 located 3) 3; 3 Also, in the second coil unit 2, the N insulated conductive wires 61 of the winding wire 6 are each wound in a second plane, wherein the first plane and the second plane are parallel to each other.

Specifically, as shown in fig. 4, when winding the same layer of coil units, only one insulated conducting wire 61 of the winding wire 6 contacts with the winding surface 81 of the winding core 8, and the rest of the insulated conducting wires 61 are sequentially arranged adjacently along the normal direction perpendicular to the winding surface 9, that is, in the same layer of coil units (except the joint of two layers of coil units), the 1 st insulated conducting wire and the nth insulated conducting wire of the winding wire 6 in two adjacent coils contact with each other, and the rest of the insulated conducting wires in the middle position are not in contact. The thickness of first coil unit 1 with second coil unit 2 is approximately equal to singly insulated wire 61's diameter, wireless charging coil's thickness T is insulated wire diameter x 2 plus the surplus of self-adhesive layer, and the surplus less than or equal to 0.02mm of self-adhesive layer.

The parallelism of the first coil unit 1 and the second coil unit 2 of the wireless charging coil formed by winding in the first winding way is less than 0.02mm, which shows that the wireless charging coil has good parallelism; as an example, the lengths of the first outgoing line 3 and the second outgoing line 4 are, for example, 25mm ± 2mm, but of course, the lengths may be freely adjusted according to needs, and the invention is not limited thereto.

As shown in table 1, specification data of coils (a1 to a9) of different specifications in 9 formed by winding in the first winding method are shown.

TABLE 1 Specifications of 9 different coils formed by the first winding method

The wire diameter refers to the diameter of the insulated conducting wire in the winding wire, and the number of strands refers to the number of the insulated conducting wires in the winding wire.

In the first winding mode, the winding wire 6 formed by arranging a plurality of insulated wires 61 in parallel is adopted, so that the sectional area of each coil can be increased to reduce the direct current impedance of the wireless charging coil, and meanwhile, the thickness T of the wireless charging coil cannot be increased (because of adopting thinner wires), so that the wireless charging coil has good elasticity during installation; the multi-strand insulated conducting wire 61 is adopted to replace a single-strand wire with the same total cross section, so that the skin effect is reduced, the quality factor Q of the wireless charging coil is improved, the proportion of power loss is reduced, and the wireless charging efficiency can be improved; adopt the double-deck flat wireless charging coil that first kind of coiling mode formed, when the inductance promoted, also can reduce wireless charging coil number of turns, also its external diameter D reduces promptly to reduce the size based on the wireless charging device of this wireless charging coil preparation, practice thrift the cost, it is more convenient to carry moreover.

3 in 3 another 3 winding 3

manner

3, 3 as 3 shown 3 in 3 fig. 3 5 3, 3 which 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 a 3- 3 a 3 direction 3 in 3 fig. 3 1 3, 3 in 3 the 3 first 3 coil 3 unit 3 1 3, 3 the 3 n 3 insulated 3 conductive 3 wires 3 61 3 of 3 the 3 winding 3 wire 3 6 3 are 3 wound 3 in 3 n 3 planes 3 parallel 3 to 3 each 3 other 3, 3 respectively 3; 3 Likewise, in the second coil unit 2, the N insulated wires 61 of the winding wire 6 are wound in N other planes parallel to each other, respectively; wherein N planes in the first coil unit 1 and the other N planes in the second coil unit 2 are parallel to each other.

Specifically, as shown in fig. 6, when winding the same layer of coil unit, each insulated wire 61 in the winding wire 6 is in contact with the winding surface 9 of the winding core 8, that is, in the same layer of coil unit (except the joint of two layers of coil units), each insulated wire in the winding wire 6 is in contact with itself and two adjacent insulated wires located in the insulated wire in adjacent coils, and the thickness T of the wireless charging coil is the diameter of the insulated wire x 2N plus the margin of the self-adhesive layer 62.

In the wireless charging coil formed by winding in the second winding manner, the parallelism of the first coil unit 1 and the second coil unit 2 is less than 0.02mm, that is, the wireless charging coil of the present invention has good parallelism, and as an example, the lengths of the first external outgoing line 3 and the second external outgoing line 4 are, for example, 25mm ± 2mm, and of course, the lengths can also be freely adjusted according to needs, which is not limited thereto.

In the second winding mode, the winding wire 6 formed by arranging a plurality of insulated conducting wires 61 in parallel is adopted, so that the sectional area of each coil can be increased to reduce the direct-current impedance of the wireless charging coil; the multi-strand insulated conducting wire 61 is adopted to replace a single-strand wire with the same total cross section, so that the skin effect can be reduced, the quality factor Q of the wireless charging coil can be improved, the proportion of power loss can be reduced, and the wireless charging efficiency can be improved; adopt the double-deck flat wireless charging coil that the winding form of second kind, when the inductance promoted, also can very big reduction wireless charging coil number of turns, also can be very big dwindle of its external diameter D.

In order to stabilize the structure of the wireless charging coil formed by winding, after the winding is finished, the winding wires 6 can be fixed by the self-adhesive property of the self-adhesive layer 62, and of course, other suitable methods can be used for fixing by bonding, which is not limited to this.

As shown in fig. 1, the ends of the first external outgoing line 3 and the second external outgoing line 4 are processed by tin immersion, and a tin layer 5 is coated on the ends of the first external outgoing line 3 and the second external outgoing line 4, so that the insulated wires 61 are electrically connected with each other at the ends of the first external outgoing line 3 and the second external outgoing line 4.

Specifically, the first coil unit 1 and the second coil unit 2 are both tightly wound structures, such as alpha tightly wound structures.

As shown in fig. 7 and 8, in an embodiment, the wireless charging coil may further include a shielding layer 7, where fig. 7 is a top view of the wireless charging coil of the present invention with the shielding layer 7 disposed therein, fig. 8 is a side view of the wireless charging coil of the present invention with the shielding layer 7 disposed therein, and the structures of fig. 7 and 6 are similar to those of fig. 1 and 2, respectively, and are not repeated herein. The shielding layer 7 is disposed on at least one end surface of the wireless charging coil, fig. 6 only shows that the shielding layer 7 is disposed on one end surface of the wireless charging coil (exposed surface of the second coil unit 2), and of course, the shielding layer may also be disposed on the other end surface of the wireless charging coil (exposed surface of the first coil unit 1) or both end surfaces.

It is understood that the shape of the shielding layer 7 shown in fig. 7 is a rounded rectangle, which is only an example, and the shape can be flexibly set according to the specific shape of the wireless charging coil, and is not limited thereto.

The thickness T of the wireless charging coil is about the sum of the thickness of the first coil unit 1, the thickness of the second coil unit 2 and the thickness of the shielding layer 7, wherein the thickness of the shielding layer 7 may be 0.05-0.18 mm, and as an example, the thickness thereof may be 0.11 mm.

The invention also provides a wireless charging device, which at least comprises a shell and a transmitting coil arranged in the shell, wherein the transmitting coil is composed of one or more wireless charging coils, and the plurality of wireless charging coils can be one or any combination of several wireless charging coils. Of course, wireless charging device for example still can include the magnetic core, the number of turns of greatly reduced coil to reduce the direct current resistance of wireless charging coil, be favorable to improving the Q value of wireless charging coil.

The wireless charging coil is also applied to an existing wireless charging device, and is used for replacing a coil in the existing wireless charging device. Of course, the wireless charging coil of the invention is not limited to be applied to the field of wireless charging, and can also be applied to other fields.

In summary, the present invention provides a wireless charging coil and a wireless charging device, including a first coil unit formed by winding a portion of a winding wire from inside to outside in a clockwise/counterclockwise direction; the second coil unit is formed by winding the other part of the winding wire from inside to outside along the anticlockwise/clockwise direction, and the second coil unit and the first coil unit form a double-layer stacked structure; two end sides of the winding wire are respectively used as a first external outgoing line of the first coil unit and a second external outgoing line of the second coil unit. The wireless charging coil formed by the winding mode can avoid the occurrence of wire jumping, and reduce the processing difficulty of products and subsequent procedures; in addition, a single-stranded wire with the same total cross section is replaced by a plurality of strands of insulated wires, so that the skin effect can be reduced, the quality factor Q of the wireless charging coil is improved, the proportion of power loss is reduced, and the efficiency of wireless charging can be improved; according to the double-layer flat wireless charging coil, the number of turns of the wireless charging coil can be reduced while the inductance is improved, and the diameter of the wireless charging coil is reduced, so that the size of a wireless charging device prepared based on the wireless charging coil is reduced, the cost is saved, and the double-layer flat wireless charging coil is more convenient to carry. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A wireless charging coil, comprising at least:

the first direction is opposite to the second direction, and two end sides of the winding wire are respectively used as two outer outgoing wires of the coil.

2. The wireless charging coil of claim 1, wherein the number of windings of the first coil unit is not equal to the number of windings of the second coil unit.

3. The wireless charging coil of claim 1, wherein the first coil unit and the second coil unit are both tightly wound structures.

4. The wireless charging coil of claim 1, further comprising a shielding layer disposed on at least one end face of the wireless charging coil.

5. A wireless charging coil according to any of claims 1-4, wherein the winding wire is composed of at least one insulated wire and a self-adhesive layer, the self-adhesive layer covers the surface of the insulated wire, and the insulated wires are arranged in parallel in the same plane.

6. A wireless charging coil according to claim 5, wherein in the first coil unit the N at least one insulated wires of the winding wire are all wound in a first plane and in the second coil unit the at least one N insulated wires of the winding wire are all wound in a second plane, wherein the first and second planes are parallel to each other.

7. A wireless charging coil according to claim 5, wherein in the first coil unit the at least one N insulated wires of the winding wire are respectively wound in at least one plane parallel to each other, and in the second coil unit the at least one N insulated wires of the winding wire are respectively wound in at least one other plane parallel to each other, wherein at least one plane in the first coil unit and at least one other plane in the second coil unit are parallel to each other.

8. The wireless charging coil according to claim 5, wherein ends of the first and second external outgoing lines are subjected to a wicking process so that the insulated conductive wires are electrically connected to each other at the ends of the first and second external outgoing lines.

9. The wireless charging coil of claim 5, wherein the diameter of the insulated wire is between 0.04mm and 0.7 mm.

10. A wireless charging device, comprising a housing, and at least one wireless charging coil according to any one of claims 1-9 disposed in the housing.