Wireless charging device

Abstract

The present invention relates to the technical field of automobile wireless charging, and specifically discloses a wireless charging device, in which a base is provided with a receiving groove, a spiral convex strip is convexly provided at the bottom of the receiving groove, and the spiral convex strip is spirally wound to form a plurality of spiral mounting grooves; a coil is wound in the spiral mounting groove, and the width of the spiral mounting groove is smaller than the diameter of the cable constituting the coil. The base also has a connecting groove, the extending direction of which is perpendicular to the extending direction of the spiral mounting groove, and passes through a plurality of spiral mounting grooves, and the extending direction of the connecting groove is from the inner circle to the outer circle of the spiral mounting groove. The bottom of the connecting groove is lower than the abutment between the coil and the side wall of the spiral mounting groove. A cover body is provided on the base, and the cover body can close the receiving groove. The above arrangement enables the glue to flow into the entire spiral mounting groove through the connecting groove after the glue is poured, so that the spiral mounting groove between the coil and the bottom of the receiving groove is effectively filled, thereby improving the heat dissipation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile wireless charging, and in particular to a wireless charging device. Background Art

[0002] The transmission power of the wireless charging device for automobiles is the core of its product competition. The current maximum transmission power can reach tens of kilowatts. High transmission power means that the overall loss power consumption of the transmitter and receiver is relatively larger. The higher the power, the more heat and thermal radiation energy it generates. The temperature of the product will directly affect its working stability (the functions of electronic devices are mostly affected by the ambient temperature. When the temperature is too high, the electronic components will fail or even burn out). As the basic component of wireless charging for automobiles, the nature of the Litz coil itself determines that it is one of the heat sources. In order to improve the fixing effect of the Litz coil, a wire groove is generally set on the tray, and the width of the wire groove is slightly smaller than the diameter of the Litz wire to achieve an interference fit.

[0003] The above-mentioned matching method makes it impossible to ensure that the gap between the middle of the Litz coil and the bottom of the wire slot can be filled with glue when the tray and the Litz coil are subsequently filled with glue, resulting in low heat dissipation efficiency.

[0004] Therefore, it is urgent to study a wireless charging device to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a wireless charging device to solve the problem of low heat dissipation efficiency in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a wireless charging device, which includes:

[0008] A base, wherein the base is provided with a receiving groove, a spiral convex strip is convexly provided at the bottom of the receiving groove, and the spiral convex strip is spirally wound to form a plurality of spiral installation grooves;

[0009] A coil, wherein the coil is wound in the spiral mounting groove, and the width of the spiral mounting groove is smaller than the diameter of the cable constituting the coil;

[0010] A connecting groove, the extending direction of which is perpendicular to the extending direction of the spiral mounting groove and passes through a plurality of circles of the spiral mounting groove; the bottom of the connecting groove is lower than the abutment point between the coil and the side wall of the spiral mounting groove;

[0011] The cover body is disposed on the base, and the cover body can close the accommodating groove to form an accommodating cavity.

[0012] As an optional technical solution for the wireless charging device, the bottom of the connecting groove is lower than the bottom of the accommodating groove.

[0013] As an optional technical solution for a wireless charging device, a plurality of the communicating grooves are provided, and the plurality of the communicating grooves are evenly distributed around the center of the spiral mounting groove.

[0014] As an optional technical solution for a wireless charging device, the width of the connecting groove is 2 mm-10 mm.

[0015] As an optional technical solution of a wireless charging device, the distance between two adjacent connecting grooves is greater than or equal to 2 mm.

[0016] As an optional technical solution for the wireless charging device, the cover body is provided with a glue injection hole, and the glue injection hole is connected to the accommodating cavity.

[0017] As an optional technical solution for a wireless charging device, a plurality of the connecting grooves are provided, and the width dimensions of the plurality of connecting grooves increase sequentially along the winding direction of the coil.

[0018] As an optional technical solution for a wireless charging device, the outer contour of the spiral mounting groove projected on the bottom of the accommodating groove is roughly square, and four connecting grooves are provided, and the four connecting grooves are respectively perpendicular to the four sides of the outer contour.

[0019] As an optional technical solution for a wireless charging device, at least one side wall of the spiral mounting groove is provided with a fixing protrusion, and the fixing protrusion extends in a direction perpendicular to the extension direction of the spiral mounting groove, and the extension direction of the fixing protrusion is parallel to the bottom of the accommodating groove.

[0020] As an optional technical solution for a wireless charging device, the outer contour of the projection of the spiral mounting groove on the bottom of the accommodating groove is roughly square, and there are four groups of fixing protrusions in each circle of the spiral mounting groove, and the four groups of fixing protrusions are respectively arranged at the four corners of the spiral mounting groove.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides a wireless charging device, which includes a base, wherein the base is provided with a spiral convex strip, the spiral convex strip is coiled to form a plurality of spiral mounting grooves, and a coil is wound in the spiral mounting groove; a connecting groove is provided on the base, and an extension direction of the connecting groove is perpendicular to an extension direction of the spiral mounting groove, and the connecting groove passes through a plurality of spiral mounting grooves, and a groove body of the connecting groove is lower than abutment between the coil and the groove bottom of the spiral mounting groove, so that after glue is poured, the glue can flow through the connecting groove to a gap between the middle of the coil and the bottom of the spiral mounting groove, so that the spiral mounting groove between the coil and the base is effectively filled, thereby improving heat dissipation efficiency.

[0023] In addition, the provision of the connecting groove enables the glue to flow between the spiral mounting grooves of different circles, thereby improving the efficiency of glue pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a wireless charging device in an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a cross-section of a wireless charging device in an embodiment of the present invention;

[0026] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0027] Figure 4 It is a structural schematic diagram of a base and a coil in an embodiment of the present invention;

[0028] Figure 5 Based Figure 4 The cross-section along the KK direction;

[0029] Figure 6 for Figure 5 The enlarged view of point B in the middle;

[0030] Figure 7 is a structural schematic diagram of a base in a first viewing angle in an embodiment of the present invention;

[0031] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0032] Fig. 9 is a structural schematic diagram of a base at a second viewing angle in an embodiment of the present invention;

[0033] Fig.10 It is a schematic diagram of the partial structure of the base in an embodiment of the present invention, and there are two connecting grooves on the same side of the spiral installation groove.

[0034] In the figure:

[0035] 100, base; 110, receiving groove; 120, spiral convex strip; 130, spiral mounting groove; 131, upper groove; 132, lower groove; 133, fixing protrusion; 140, connecting groove; 140a, first through groove; 140b, second through groove; 140c, third through groove; 140d, fourth through groove;

[0036] 200, coil;

[0037] 300, cover body; 310, glue injection hole. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] like Figures 1 to 10 As shown, this embodiment provides a wireless charging device, which is used to charge the battery of a car. The wireless charging device includes a base 100, a coil 200 and a cover 300, wherein the base 100 is provided with a receiving groove 110, and a spiral convex strip 120 is convexly provided at the bottom of the receiving groove 110, and the spiral convex strip 120 is spirally wound to form a plurality of spiral mounting grooves 130; the coil 200 is wound in the spiral mounting groove 130, and the width of the spiral mounting groove 130 is smaller than the diameter of the cable constituting the coil 200, and the size setting enables the coil 200 to be interference-fitted in the spiral mounting groove 130. The base 100 also has a connecting groove 140, the extending direction of which is perpendicular to the extending direction of the spiral mounting groove 130, and passes through a plurality of spiral mounting grooves 130, and the extending direction of the connecting groove 140 is the direction from the inner circle to the outer circle of the spiral mounting groove 130. The bottom of the connecting groove 140 is lower than the contact point between the coil 200 and the side wall of the spiral installation groove 130. The cover 300 is disposed on the base 100, and the cover 300 can close the accommodating groove 110. The side wall of the cover 300 and the side wall of the accommodating groove 110 form an accommodating cavity.

[0043] With the aid of the above arrangement, after glue filling, the wireless charging device can flow the glue through the connecting groove 140 to the gap between the middle of the coil 200 and the bottom of the spiral mounting groove 130, so that the spiral mounting groove 130 between the coil 200 and the bottom of the accommodating groove 110 is effectively filled, thereby improving the heat dissipation efficiency.

[0044] Specifically, the middle of the coil 200 abuts against the side wall of the spiral installation groove 130, so that the coil 200 is clamped. In other words, the cable wound into the coil 200 is cylindrical, and the plane where the diameter of the cable is located is defined as the installation plane, the installation plane is parallel to the bottom of the accommodating groove 110, and the installation plane divides the spiral installation groove 130 into an upper groove 131 and a lower groove 132. The bottom of the connecting groove 140 is lower than the installation plane, and the glue in the upper groove 131 can flow into the lower groove 132 through the connecting groove 140.

[0045] In the prior art, the glue cannot flow into the lower groove 132. For ease of understanding, the direction away from the bottom of the receiving groove 110 is defined as upward, and the direction close to the bottom of the receiving groove 110 is defined as downward.

[0046] In addition, the connecting groove 140 connects the lower grooves 132 of two adjacent spiral mounting grooves 130 , so that the glue can flow between the spiral mounting grooves 130 of different circles, thereby improving the efficiency of glue pouring.

[0047] In some embodiments, the bottom of the connecting groove 140 is lower than the bottom of the receiving groove 110. Specifically, the distance H1 between the bottom of the connecting groove 140 and the bottom of the receiving groove 110 is between 2 mm and 6 mm. In some embodiments, the distance H1 between the bottom of the connecting groove 140 and the bottom of the receiving groove 110 is 0.5 mm. This configuration allows the glue to flow in the connecting groove 140, thereby overflowing upward and filling the lower groove 132.

[0048] In other words, the depth of the communication groove 140 is greater than the depth of the spiral installation groove 130 .

[0049] In some embodiments, a plurality of communication grooves 140 are provided, and the plurality of communication grooves 140 are evenly distributed around the center of the spiral installation groove 130. This arrangement makes the flow effect of the glue better and more uniform.

[0050] The width of the connecting groove 140 should not be too small or too large. In this embodiment, the width of the connecting groove 140 is 2 mm-10 mm. The above setting allows the width of the connecting groove 140 to meet the glue flow requirements and avoid the phenomenon of wire overlap between adjacent coils 200. In other embodiments, the width of the connecting groove 140 can also be reasonably set according to the diameter of the cable. Under the premise of avoiding overlap, in embodiments with thicker cables, the width of the connecting groove 140 can also be appropriately increased.

[0051] It should be noted that the width dimension of the connecting groove 140 is measured in the extending direction of the spiral installation groove 130. The width dimension of the spiral installation groove 130 is measured in the direction from the inner circle to the outer circle of the spiral installation groove 130.

[0052] To ensure the clamping force for the cable, in some embodiments, the distance H2 between two adjacent communication grooves 140 is greater than or equal to 2 mm. In other words, the length H2 of the spiral ridge 120 between the two communication grooves 140 is greater than or equal to 2 mm, thereby ensuring that the spiral ridge 120 has sufficient strength to clamp the cable and fix the coil 200.

[0053] The cover body 300 is provided with a glue injection hole 310, and the glue injection hole 310 is connected to the accommodating cavity. The above arrangement makes glue injection more convenient. In some embodiments, in order for the glue to fully flow to each position, the glue injection hole 310 is located at the center of the spiral mounting groove 130. This arrangement allows the glue to spread outward from the middle, thereby filling the entire accommodating cavity.

[0054] Since the glue flows along the winding direction of the coil 200, the further back it flows, the slower it flows. In order to improve the smoothness of the glue flow, the width dimensions of the plurality of connecting slots 140 are sequentially increased along the winding direction of the coil 200. The winding direction of the coil 200 is counterclockwise. Specifically, taking the example of four connecting slots 140, the four connecting slots 140 are defined as the first through slot 140a, the second through slot 140b, the third through slot 140c and the fourth through slot 140d, respectively. The first through slot 140a, the second through slot 140b, the third through slot 140c and the fourth through slot 140d are arranged counterclockwise, wherein the width dimension of the first through slot 140a is L1, the width dimension of the second through slot 140b is L2, the width dimension of the third through slot 140c is L3, and the width dimension of the fourth through slot 140d is L4, and L1<L2<L3<L4. With the above arrangement, the glue slows down during the flow process, and its fluidity is reduced. However, during the flow process, the glue gradually encounters wider connecting grooves 140, thereby improving the fluidity of the flow again.

[0055] The width of each connecting groove 140 gradually increases from the inner circle to the outer circle of the spiral installation groove 130. With the arrangement of the above structure, the resistance of the glue gradually decreases during the flow from the inside to the outside, thereby improving the smoothness of the flow.

[0056] In some embodiments, the outer contour of the projection of the spiral installation groove 130 on the groove bottom of the receiving groove 110 is roughly square, and there are four connecting grooves 140, which are respectively perpendicular to the four sides of the outer contour, and the angle between any two adjacent connecting grooves 140 is the same. That is, the angle α between two adjacent connecting grooves 140 is 90 degrees. The above arrangement allows the glue to spread outward in the four connecting grooves 140, thereby flowing to the bottom of each circle of the spiral installation groove 130, and then fill the lower groove 132 in the process of spreading upward.

[0057] At least one side wall of the spiral installation groove 130 is provided with a fixing protrusion 133, which extends in a direction perpendicular to the extension direction of the spiral installation groove 130, and the extension direction of the fixing protrusion 133 is parallel to the bottom of the accommodating groove 110. This arrangement can reduce the contact area with the cable, thereby increasing the extrusion force and improving the firmness of the coil 200; in addition, it can also increase the channel for glue flow, making it easier for the glue to flow to the lower groove 132.

[0058] In this embodiment, the receiving groove 110 is square, and the outer contour of the projection of the spiral installation groove 130 on the bottom of the receiving groove 110 is roughly square. Specifically, each individual coil 200 has four straight edges, but the coil 200 generally avoids right angles at the corners. Therefore, the cables at the corners are all arc-shaped edges, and the distance between two adjacent arc-shaped edges is greater than the distance between two adjacent straight edges. In order to avoid the cables at the corners being fixed loosely, in some embodiments, four groups of fixing protrusions 133 are provided in each circle of the spiral installation groove 130, and the four groups of fixing protrusions 133 are respectively provided at the four corners of the spiral installation groove 130, and each group has three fixing protrusions 133. Roughly square means that the length of the four sides of the contour shape can have an error of 0.1mm-1mm. In other embodiments, the outer contour of the projection of the spiral installation groove 130 on the bottom of the receiving groove 110 can also be circular.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A wireless charging device, characterized in that: include: A base (100), the base (100) being provided with a receiving groove (110), the groove bottom of the receiving groove (110) being provided with a spiral convex strip (120), the spiral convex strip (120) being spirally wound to form a plurality of spiral installation grooves (130); A coil (200), the coil (200) being wound in the spiral installation groove (130), and the width of the spiral installation groove (130) being smaller than the diameter of a cable constituting the coil (200); a connecting groove (140), the extending direction of the connecting groove (140) being perpendicular to the extending direction of the spiral mounting groove (130), and penetrating a plurality of circles of the spiral mounting groove (130); the bottom of the connecting groove (140) being lower than the abutment point between the coil (200) and the side wall of the spiral mounting groove (130); The cable wound into a coil (200) is cylindrical, and the plane where the diameter of the cable is located is defined as a mounting plane. The mounting plane is parallel to the bottom of the accommodating groove (110), and the mounting plane divides the spiral mounting groove (130) into an upper groove (131) and a lower groove (132). The bottom of the connecting groove (140) is lower than the mounting plane, and the glue in the upper groove (131) flows into the lower groove (132) through the connecting groove (140); A cover body (300), the cover body (300) is disposed on the base (100), and the cover body (300) can close the accommodating groove (110) and form an accommodating cavity.

2. The wireless charging device according to claim 1, characterized in that: The bottom of the connecting groove (140) is lower than the bottom of the containing groove (110).

3. The wireless charging device according to claim 1, characterized in that: A plurality of the communication grooves (140) are provided, and the plurality of the communication grooves (140) are evenly distributed around the center of the spiral installation groove (130).

4. The wireless charging device according to claim 1, characterized in that: The width of the connecting groove (140) is 2 mm to 10 mm.

5. The wireless charging device according to claim 1, characterized in that: The distance between two adjacent communicating grooves (140) is greater than or equal to 2 mm.

6. The wireless charging device according to claim 1, characterized in that: The cover body (300) is provided with a glue injection hole (310), and the glue injection hole (310) is connected to the accommodating cavity.

7. The wireless charging device according to claim 6, characterized in that: A plurality of the connecting grooves (140) are provided, and the width dimensions of the plurality of connecting grooves (140) increase sequentially along the winding direction of the coil (200).

8. The wireless charging device according to any one of claims 1 to 7, characterized in that: The outer contour of the projection of the spiral installation groove (130) on the groove bottom of the accommodating groove (110) is roughly square, and four connecting grooves (140) are provided, and the four connecting grooves (140) are respectively perpendicular to the four sides of the outer contour.

9. The wireless charging device according to any one of claims 1 to 7, characterized in that: At least one side wall of the spiral installation groove (130) is provided with a fixing protrusion (133), the fixing protrusion (133) extending in a direction perpendicular to the extension direction of the spiral installation groove (130), and the extension direction of the fixing protrusion (133) is parallel to the groove bottom of the accommodating groove (110).

10. The wireless charging device according to claim 9, characterized in that: The outer contour of the spiral installation groove (130) projected on the groove bottom of the accommodating groove (110) is roughly square, and four groups of fixing protrusions (133) are provided in each circle of the spiral installation groove (130), and the four groups of fixing protrusions (133) are respectively provided at the four corners of the spiral installation groove (130).

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