Wireless charging coil module

Abstract

The present application relates to a coil module for wireless charging, comprising a plurality of coils and a honeycomb structure plate, wherein the coils are arranged in the respective cells of the honeycomb structure plate. The coil module of the present application combines the honeycomb structure with the coils to form a coil module capable of efficiently charging in a certain area, or as a receiving end for charging, arranged in an electric vehicle, for example, to form electromagnetic induction with the existing wireless charging mechanism, thereby charging the battery. The coil module has the advantages of high physical strength, good charging effect, easy construction and installation, and can be laid on the road surface, parking lot and other locations.

Description

TECHNICAL FIELD

[0001] The present application relates to a device for charging, in particular to a coil module for wireless charging. BACKGROUND

[0002] The wireless charging technology of electromagnetic induction type is to pass a certain frequency of alternating current in the transmission end coil, generate a certain current in the receiving end coil through the principle of electromagnetic induction, so as to realize the charging of the battery. In this mode, both the transmission end and the receiving end use coils, but in the prior art, the laying and construction of the coil are very troublesome. Therefore, wireless charging is also limited to specific fixed areas, such as parking lots or specific charging points. SUMMARY

[0003] The main purpose of the present application is to provide a coil module for wireless charging which can be easily expanded to any size.

[0004] In order to achieve the above-mentioned purpose, the present application relates to a coil module for wireless charging, comprising:

[0005] a plurality of coils,

[0006] a honeycomb structure plate,

[0007] The coil is arranged in each honeycomb of the honeycomb structure plate.

[0008] In some embodiments, the frame adopts a honeycomb structure plate, and the honeycomb in the honeycomb structure plate is arranged as the hole to arrange the coil.

[0009] In some embodiments, the honeycomb structure plate is formed by alternately fixing a corrugated core plate and a partition plate, and the honeycomb is formed between each recess on both sides of the corrugated core plate and the partition plate.

[0010] In some embodiments, the corrugated core plate and / or the partition plate contains glass fiber reinforced cloth.

[0011] In some embodiments, the coil has a shape matched with the honeycomb.

[0012] In some embodiments, the honeycomb is a trapezoidal honeycomb.

[0013] In some embodiments, the upper and lower surfaces of the honeycomb structure plate are covered with a non-metallic skin.

[0014] In some embodiments, the plurality of coils are connected in parallel with each other.

[0015] In some embodiments, the coils arranged in each honeycomb are parallel to each other.

[0016] The coil module of the present application combines the honeycomb structure with the coil to form a coil module capable of efficient wireless charging in a certain area, or as a receiving end of charging, is arranged in an electric vehicle, forms electromagnetic induction with the existing wireless charging mechanism, and thus charges the charging battery. The coil module has the advantages of high physical strength, good charging effect, easy construction and installation, and can be laid on the road surface, parking lot and other positions. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of a partial cross-sectional structure of the coil module.

[0018] Figure 2 It is a schematic view of the structure of the magnetic coil module.

[0019] Figure 3 It is a schematic view of the longitudinal cross-sectional structure of the coil module.

[0020] Figure 4 It is a schematic view of the magnetic coil array of S rows and T columns.

[0021] Figure 5 It is a schematic view of the structure of the single-channel magnetic coil.

[0022] Figure 6 It is a schematic view of electromagnetic induction.

[0023] In the figure, 10 is a honeycomb structure plate, 11 is a partition plate, 12 is a corrugated core plate, 13 is a honeycomb, 20 is a magnetic coil, 30 is a skin, 100 is a magnetic coil module, 200 is an induction coil module, and 300 is a single-channel magnetic coil. DETAILED DESCRIPTION

[0024] The present application will be further described below in conjunction with the drawings and examples.

[0025] Reference Figure 1 The coil module of the present embodiment includes a honeycomb structure plate 10 and a plurality of coils 20, and the coils 20 are arranged in each honeycomb 13 in the honeycomb structure plate 10. The coil module can be connected to a power supply to generate a variable magnetic field for wireless charging, or can be connected to a charging battery to induce a change in magnetic flux in the magnetic field to generate a current for charging. The above-mentioned coil module is simply spliced to form a larger charging area.

[0026] The honeycomb structure plate 10 in the coil module is formed by alternately and fixedly connecting the corrugated core plate 12 and the partition plate 11, as shown in Figure 2, the recesses on both sides of the corrugated core board 12 and the partition plates 11 form the honeycombs 13. In the production process, the corrugated core board 12 and the partition plate 11 are alternately fixed, the recesses on both sides of the corrugated core board 12 and the partition plates form the honeycombs 13, and the coils 20 are arranged in the formed honeycombs. The honeycomb structure plate 10 can be a flat plate or have a certain arc.

[0027] In order to increase the toughness and strength of the corrugated core board 12 and the partition plate 11, glass fiber reinforced cloth can be contained in the corrugated core board 12 and the partition plate 11. The glass fiber reinforced cloth can increase the strength and toughness of the corrugated core board and the partition plate, so that the use range of the magnetic coil module is more extensive. One of the implementation methods is that the glass fiber reinforced cloth is coated with resin on both sides, and then the existing curing forming process is used to obtain the corrugated core board 12 with concave-convex structure and the partition plate 11 with flat surface. The shape of the recess in the corrugated core board can be a half-honeycomb trapezoid. In some embodiments, the trapezoids opposite to each other can form a complete hexagonal honeycomb, or a square, a triangle, and other artificial honeycomb shapes. The coil has a shape matched with the honeycomb. For example, when the honeycomb is a trapezoid, the magnetic coil also has a corresponding trapezoidal shape, so that the magnetic coil can be well fixed when it is received in the honeycomb, and the direction of the magnetic force line is controlled.

[0028] Reference Figure 3 The upper and lower surfaces of the honeycomb structure plate 10 described above can be covered with a non-metal skin 30, thereby increasing the strength of the upper and lower surfaces and effectively protecting the magnetic coil 20 in the honeycomb 13 from damage from the outside. The skin can further increase the bending resistance of the honeycomb structure plate.

[0029] The coil module with the above structure can be used in electromagnetic induction to replace the corresponding magnetic coil and induction coil. Reference Figure 4 The magnetic coil and the induction coil are replaced by the above coil template. The lower coil template is connected with the power supply to form a variable magnetic field, and the upper coil template induces the change of the magnetic flux to generate induced current for charging the battery.

[0030] In some embodiments, the coils in the coil module are connected in parallel with each other. The parallel connection can significantly reduce the heat generated on one side of the coil module during wireless charging. The principle can be referred to the following calculation:

[0031] Reference Figure 6 In the existing single-channel electromagnetic induction charging process, assuming that the transient voltage of the single-channel magnetic coil 300 is U, and the current change is △I, the transient work of the single-channel magnetic coil 300 is U△I. If the internal resistance of the magnetic coil is R, the total heat generation power is I 2 R.

[0032] When the magnetic coil is composed of N magnetic coils with internal resistance R in parallel, the current in each coil is reduced to I / N. Assuming that the transient voltage of the power system is U, the current change is △I, and the transient work done on each parallel coil is U△I / N, the total work done by the power is still U△I. However, since the current flowing through each inductive coil is only 1 / N of the original, the total heating power of the inductive coil is N(I / N) 2 R = I 2 R / N, which is 1 / N of the original single coil heating power.

[0033] Now we consider that the coil is composed of S rows and T columns in parallel when N = S*T (reference Figure 5 ), where the side length of the coil is d1 and d2, and the coils are separated from each other by a non-metal grid:

[0034] At the same time, assume that the side length of the single large channel coil is D1 and D2, where D1 = S*d1 and D2 = T*d2, and the cross-sectional area of the single large channel and the parallel multi-channel coil is A and a respectively, and the coil number is n, and the material resistivity is ρ, then the resistance of each small coil is 2nρ(d1+d2) / a, and the resistance of the large coil is 2nρ(S*d1+T*d2) / A = 2nρ(S*d1+T*d2) / A.

[0035] If the transient voltage of the single large channel coil is U, the current is I, the current change is △I, and the transient work is U△I, then the current of each small coil is I / S / T, the current change is △I / S / T, and the total work done by the power is U△I, maintaining the same power. The transient heating power of the single large channel coil is H = I 2 [2nρ(S*d1+T*d2) / A] = I 2 [2nρ(S*d1+T*d2)] / A, but the total heating power of the small coil is h = (I / S / T) 2 [2nρ(d1+d2) / a*S*T] = I 2 [2nρ(d1+d2)] / [aST].

[0036] When S = T, d1 = d2 = d, D1 = D2 = D = S*d, and A = a, W = I 2 [4nρ*S*d] / A, h = I 2 [4nρd] / A / S 2 = H / S 2 , that is, the total heating power of the multi-channel parallel small coil is 1 / S 2 of the single large channel coil.

[0037] Or, when S = T, d1 = d2 = d, D1 = D2 = D = S*d, and a = A / S, W = I2 [4nρ*S*d] / A,h=I 2 [4nρd] / A / S=H / S, also, that is, the total power of the multi-channel parallel small coil is 1 / S of the single large channel coil.

[0038] Therefore, the coil module of the parallel coil can significantly reduce the heating power of the magnetic coil while maintaining the total work of the electric power unchanged, reducing the loss of electric energy.

[0039] It is just because of the beneficial effect of reducing the heating power that the material with lower cost and higher resistivity can be used to make the coil within the acceptable heating power range, such as adjusting the iron coil or aluminum coil from the original copper coil. According to the literature, the resistivity of copper is 1.75*10 -8 Ω·m, the resistivity of iron is 9.78*10 -8 Ω·m, which is 5.58 times of copper, and the number of magnetic coils (S*T) is greater than or equal to 6, which can be lower than the original heating power. The resistivity of aluminum is 2.83*10 -8 Ω·m, which is 1.62 times of copper, and the number of magnetic coils is greater than two, which can be lower than the original heating power, which can effectively reduce the cost of materials.

[0040] The embodiments in the present application are only used to illustrate the present application and do not constitute a limitation on the scope of the claims, and other substantially equivalent alternatives that can be thought of by those skilled in the art are within the protection scope of the present application.

Claims

1. Coil module for wireless charging, characterized in that The utility model relates to a honeycomb structure plate and a coil set, and belongs to the technical field of energy saving and environmental protection. It comprises: a plurality of coils, a honeycomb structure plate, the coil is arranged in each honeycomb of the honeycomb structure plate, the honeycomb structure plate is formed by alternately fixing corrugated core plates and partition plates, and each recess on both sides of the corrugated core plate and the partition plate form a honeycomb, the coil has a shape matched with the honeycomb, 2. The coil module of claim 1, wherein the plurality of coils are connected in parallel with each other.

3. The coil module of claim 1, wherein The corrugated core plate and / or the partition plate contain glass fiber reinforced cloth.

4. The coil module of claim 1, wherein The honeycomb is a trapezoidal honeycomb.

5. The coil module of claim 1, wherein The upper and lower surfaces of the honeycomb structure plate are covered with a non-metal skin. The coils arranged in each honeycomb are parallel to each other.

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