Non-contact power transmission device

Abstract

A non-contact power transmission device according to the present invention has a coil obtained by winding a litz wire, and the coil is sealed with a resin.

Description

Technical Field

[0001] The present invention relates to a non-contact power transmission device.

Background Art

[0002] Conventionally, non-contact power feeding is known as a method for supplying electric power to a battery mounted on an electric vehicle. In non-contact power feeding, electric power is transmitted from a power transmission side coil unit arranged on the ground to a power reception side coil unit mounted on the electric vehicle, thereby supplying electric power to the battery mounted on the electric vehicle.

[0003] Patent Document 1 discloses a power feeding coil unit (non-contact power transmission device) used for non-contact power feeding. The power feeding coil unit described in Patent Document 1 includes a case, a cover that covers an opening of the case, a coil body housed in the case and the cover, and an electric wire cable for supplying electric power to the coil body from an external power supply.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of Invention

Problem to be Solved by the Invention

[0005] The non-contact power transmission device described in Patent Document 1 is disposed underground, and it is conceivable that dew condensation may occur inside the non-contact power transmission device depending on the weather conditions on the ground. In this case, there is a risk that the non-contact power transmission device may not function properly due to occurrence of electric leakage or the like.

[0006] Accordingly, an object of the present invention is to provide a non-contact power transmission device that can operate properly even under dew condensation conditions.

Means for Solving the Problem

[0007] To solve the above problems, according to the present invention, It has a coil wound with Litz wire, A non-contact power transmission device is provided, characterized in that the coil is sealed with resin. [Effects of the Invention]

[0008] The contactless power transmission device of the present invention provides a contactless power transmission device that can operate properly even under condensation conditions. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic diagram showing the configuration of a contactless power supply system according to Embodiment 1 of the present invention. [Figure 2] Figure 2A is a cross-sectional view of the cable (first connection wire), and Figure 2B is a cross-sectional view of the connection between the cable and the contactless power transmission device. [Figure 3] Figure 3A is a cross-sectional view of the first Litz wire after fusing, and Figure 3B is a plan view of the connection point between the cable and the contactless power transmission device. [Figure 4] Figure 4 is a perspective view showing the configuration of a contactless power transmission device. [Figure 5] Figure 5 is an exploded perspective view of a power transmission coil unit. [Figure 6] Figure 6A shows the relationship between temperature and time in a heat cycle test, Figure 6B is a graph showing the relationship between the rate of change in mass of the resin molded body and the number of heat cycles, and Figure 6C is a graph showing the relationship between the rate of change in outer diameter of the resin molded body and the number of heat cycles. [Figure 7] Figure 7 is a perspective view of the base. [Figure 8] Figure 8 is an exploded perspective view of a contactless power transmission device according to Embodiment 2 of the present invention. [Figure 9] Figure 9A is a cross-sectional view of the connection point between the cable and the contactless power transmission device, and Figure 9B is a cross-sectional view of the connection point between the cables. [Modes for carrying out the invention]

[0010] The following describes a contactless power supply system including a contactless power transmission device according to one embodiment of the present invention. The contactless power transmission device of the present invention is not limited to the embodiments shown below. The contactless power transmission device of this embodiment is a device for charging batteries mounted on electric vehicles, plug-in hybrid vehicles, etc., in a contactless manner. In this specification, the "~" indicating a numerical range includes both an upper limit and a lower limit.

[0011] [Embodiment 1] Figure 1 is a schematic diagram showing the configuration of a contactless power supply system 10 according to Embodiment 1 of the present invention. Figure 2A is a cross-sectional view of the first connecting wire 17, and Figure 2B is a cross-sectional view of the first connector 31 and the second connector 32.

[0012] As shown in Figure 1, the contactless power supply system 10 comprises a power supply 11, a contactless power transmission device 12, a cable with a connector 13, and a contactless power receiving device 15. The power supply 11 and the contactless power transmission device 12 are connected by the cable with a connector 13. In this embodiment, the power supply 11, the contactless power transmission device 12, and the cable with a connector 13 are located outside the electric vehicle 14, for example, underground or on the ground, while the contactless power receiving device 15 is located inside or on the bottom of the electric vehicle 14. In the contactless power supply system 10, power from the power supply 11 is transmitted by the contactless power transmission device 12 to the contactless power receiving device 15 inside the electric vehicle 14. The power transmitted to the contactless power receiving device 15 is stored in the battery 16.

[0013] As shown in Figures 2A and 2B, the cable with connector 13 includes a first connection wire 17 and a first connector 31. The first connection wire 17 includes a first litz wire 21, an insulating layer 22 covering the first litz wire 21, and a sheath layer 23 covering the insulating layer 22. The first litz wire 21 includes a plurality of enameled wires 24. The number of the enameled wires 24 is not particularly limited, and is appropriately set according to the electric power to be transmitted. The enameled wire 24 includes a copper wire 25 and an insulating coating 26. Examples of the material for the insulating coating 26 include polyvinyl formal, polyurethane, polyurethane nylon, polyester, polyester nylon, polyester imide, polyamide imide, polyester imide / polyamide imide, and polyimide. In the present embodiment, the twisting direction of the enameled wires 24 may be S (right-hand) twist, or may be Z (left-hand) twist. The outer diameter of the first litz wire 21 is, for example, approximately 2.5 to 8.0 mm.

[0014] The insulating layer 22 insulates the first litz wire 21 from the outside. The material for the insulating layer 22 is not particularly limited as long as it can exhibit the above function. Examples of the material for the insulating layer 22 include crosslinkable polyethylene, flame-retardant polyethylene, polyvinyl chloride, and the like. From the viewpoint of insulating properties, crosslinkable polyethylene is preferable as the material for the insulating layer 22.

[0015] The sheath layer 23 protects the first litz wire 21 covered with the insulating layer 22 from the external environment. The material for the sheath layer 23 is not particularly limited as long as it can exhibit the above function. Examples of the material for the sheath layer 23 include polyvinyl chloride, polyethylene, crosslinkable polyethylene, flame-retardant polyethylene, and the like. From the viewpoint of strength, polyvinyl chloride is preferable as the material for the sheath layer 23.

[0016] The cable 13 with a connector connects the power supply 11 and the non-contact power transmission device 12. In the present embodiment, the first connector 31 for connecting to the non-contact power transmission device 12 is arranged at the end of the first connection line 17 (the first litz wire 21) on the non-contact power transmission device 12 side. The first connector 31 connects the first connection line 17 (the first litz wire 21) and the non-contact power transmission device 12 by being connected to the second connector 32 (described later) fixed to the housing 53. At this time, from the viewpoint of improving waterproofness, it is preferable that the first flat packing 33 is arranged between the opposing surfaces of the first connector 31 and the second connector 32 (see FIG. 2B).

[0017] As shown in FIG. 2B, the first connector 31 has a first conductive member 34 and a first cover 35. The first conductive member 34 has conductivity, and transmits electric power from the first connection line 17 (the first litz wire 21) to the second conductive member 42 (described later) of the second connector 32. The configuration of the first conductive member 34 is not particularly limited as long as the above function can be exhibited. Examples of the first conductive member 34 include a crimp-type plug and the like. The material of the first conductive member 34 is not particularly limited as long as it has conductivity. Examples of the material of the first conductive member 34 include copper, brass and the like, and the surface thereof may be plated with silver or the like. In the present embodiment, the first conductive member 34 has a first tip portion 36 and a first cylindrical portion 37. The first tip portion 36 is arranged on the second connector 32 side, and the first cylindrical portion 37 is arranged on the first connection line 17 (the first litz wire 21) side.

[0018] The first tip portion 36 is a convex portion that is inserted into the second conductive member 42 of the second connector 32, and is electrically connected to the second conductive member 42. The first litz wire 21 of the first connection line 17 is inserted into the first cylindrical portion 37, and is electrically connected to the first litz wire 21. In the present embodiment, the first cylindrical portion 37 is formed with a tapered surface 38 and a through hole 39.

[0019] The tapered surface 38 functions as a guide when inserting the first litz wire 21 into the first cylindrical portion 37. The tapered surface 38 is formed such that its inner diameter decreases from the opening toward the first tip portion 36.

[0020] The through-hole 39 functions as a window for confirming whether the first Litz wire 21 is properly inserted into the first cylindrical portion 37. The through-hole 39 is located in the region of the first cylindrical portion 37 on the side of the first tip portion 36. The through-hole 39 opens to the inner and outer circumferential surfaces of the first cylindrical portion 37. The shape of the through-hole 39 is not particularly limited as long as it performs the above function. In this embodiment, the through-hole 39 is an elongated hole.

[0021] The first cover 35 covers the first conductive member 34 and is connected to the second cover 43 (described later) of the second connector 32. The first cover 35 has a first cover body 40 and a fastening member 41 that engages with the first cover body 40. The first cover body 40 is formed in a cylindrical shape so as to cover the first conductive member 34. A through hole is formed in the end face of the first cover body 40 on the second connector 32 side so that the first tip 36 of the first conductive member 34 can protrude.

[0022] The first Litz wire 21 generates heat when electricity is passed through it. Therefore, it is preferable that the first cover 35 has heat resistance and thermal conductivity. The material of the first cover 35 is preferably heat resistant. Examples of materials for the first cover 35 include polyetheretherketone and glass fiber reinforced nylon 66. From the viewpoint of heat resistance, it is preferable that the material of the first cover 35 contains polyetheretherketone.

[0023] The fastening member 41 engages with the first cover body 40 and screws into the second cover 43 to secure the first connector 31 and the second connector 32. The fastening member 41 is rotatably positioned on the first cover body 40. Furthermore, the fastening member 41 is configured to prevent it from coming off the tip side (second connector 32 side) of the first cover 35. The fastening member 41 is formed in a cylindrical shape, and screw threads are formed on its inner circumferential surface.

[0024] Figure 3A is a cross-sectional view of the first Litz wire 21 after fusing. The copper wire 25 of the first Litz wire 21 and the first cylindrical portion 37 of the first conductive member 34 are electrically connected by fusing. To achieve this, the first Litz wire 21 and the first conductive member 34 are connected, for example, by the following method. First, the insulating layer 22 and the sheath layer 23 are peeled off at the end of the first connecting wire 17 to expose the first Litz wire 21. Next, using the tapered surface 38 as a guide, the exposed first Litz wire 21 is inserted to the back of the first cylindrical portion 37. The first Litz wire 21, positioned inside the first cylindrical portion 37, is visible through the through hole 39 when fusing is performed. Specifically, an appropriate current is applied while applying pressure. As a result, the insulating coating 26 covering the copper wire 25 melts, causing the copper wires 25 to come into contact with each other, and the copper wire 25 also comes into contact with the inner circumferential surface of the first cylindrical portion 37 (see Figure 3A). Thus, the first Litz wire 21 of the first connecting wire 17 can be electrically connected to the first cylindrical portion 37 of the first conductive member 34.

[0025] As shown in Figure 2B, the second connector 32 has a second conductive member 42 and a second cover 43. The second conductive member 42 is conductive and transmits power from the first connector 31 (first conductive member 34) to the capacitor board 68 (described later) of the contactless power transmission device 12 via the busbar 47. In this embodiment, the second connector 32 is screwed to the housing 53 (described later) of the contactless power transmission device 12 via the second flat packing 44. The configuration of the second conductive member 42 is not particularly limited as long as it can perform the above functions. Examples of the second conductive member 42 include crimp-type receptacles. The material of the second conductive member 42 is not particularly limited as long as it is conductive. Examples of materials for the second conductive member 42 include copper and brass, and its surface may be plated with silver or the like. In this embodiment, the second conductive member 42 has a second tip portion 45 and a second cylindrical portion 46. The second tip portion 45 is located at the end on the first connector 31 side, and the second cylindrical portion 46 is located at the end on the contactless power transmission device 12 side.

[0026] The second tip portion 45 is formed in a cylindrical shape, into which the first tip portion 36 of the first conductive member 34 is inserted. By inserting the first tip portion 36 into the second tip portion 45, the first conductive member 34 of the first connector 31 and the second conductive member 42 of the second connector 32 are electrically connected.

[0027] A busbar 47 is inserted into the second cylindrical portion 46, and the second cylindrical portion 46 and the busbar 47 are electrically connected. The second cylindrical portion 46 is connected to the capacitor board 68 of the contactless power transmission device 12 via the busbar 47. In this embodiment, the busbar 47 is configured to be able to connect to and disconnect from the capacitor board 68 with a single touch. The busbar 47 transmits power to the capacitor board 68. In this embodiment, the busbar 47 is positioned between the capacitor board 68 and the first Litz wire 21. Examples of materials for the busbar 47 include copper, aluminum, and brass. Furthermore, from the viewpoint of reducing the contact resistance between the second conductive member 42 and the capacitor substrate 68, it is preferable that the surface roughness of the surface of the busbar 47 and the contact surface of the capacitor substrate 68 with respect to the busbar 47 are small.

[0028] The second cover 43 covers the second conductive member 42 and is connected to the first cover 35 of the first connector 31. The outer circumferential surface of the second cover 43 has screw threads (screw grooves) formed thereon for screwing into the fastening member 41 of the first cover 35.

[0029] Similar to the first cover 35, the second cover 43 is preferably heat-resistant. The material of the second cover 43 is preferably heat-resistant. The material of the second cover 43 can be the same as the material of the first cover 35.

[0030] Figure 3B is a plan view of the connection between the connector-equipped cable 13 and the contactless power transmission device 12. As shown in Figure 3B, the first connector 31 and the second connector 32 are configured to be fastened and unfastened by screwing. The first cover 35 of the first connector 31 and the second cover 43 of the second connector 32 have marks formed on them that indicate a predetermined torque when the first connector 31 and the second connector 32 are fastened together. In this embodiment, the marks include a first mark 48 and a second mark 49. The relative positions of the first mark 48 and the second mark 49 allow us to grasp the approximate torque acting on the first cover 35 and the second cover 43. In this embodiment, the first mark 48 is formed on the first cover 35, and the second mark 49 is formed on the second cover 43. The shapes of the first mark 48 and the second mark 49 are not particularly limited as long as they perform the above function. The first mark 48 and the second mark 49 may be convex, concave, or printed material. In this embodiment, both the first mark 48 and the second mark 49 are rectangular printed material. In this embodiment, the torque can be adjusted to a predetermined range by adjusting the rotation of the fastening member 41 of the first cover 35 so that a portion of the first mark 48 and the second mark 49 overlap in the rotational direction of the fastening member 41.

[0031] It is preferable that the first connector 31 and the second connector 32 are configured to be airtight with a sealing member. The sealing member is not particularly limited as long as it can perform the above function. Examples of sealing members include O-rings and flat packings. In this embodiment, the sealing member is a first flat packing 33. In this embodiment, the first flat packing 33 is placed between the end face of the first cover 35 and the end face of the second cover 43 which is opposite to the end face of the first cover 35. In order to connect the first connector 31 and the second connector 32, with the first flat packing 33 placed between the end face of the first cover 35 and the end face of the second cover 43, the fastening member 41 is engaged with the threads of the second cover, and the fastening member 41 is rotated to connect the first connector 31 and the second connector 32. At this time, since the first flat packing 33 is placed between the first connector 31 and the second connector 32, the first connector 31 and the second connector 32 are connected airtightly. Furthermore, since the first flat packing 33 contacts only the end face of the first cover 35 and the end face of the second cover 43, it does not affect the insertion and removal of the first connector 31 and the second connector 32.

[0032] Figure 4 is a perspective view of the contactless power transmission device 12 from above. Figure 5 is an exploded perspective view of the power transmission coil unit 51.

[0033] As shown in Figures 4 and 5, the non-contact power transmission device 12 includes a power transmission coil unit 51 and a shielding unit 52.

[0034] In this embodiment, the power transmission coil unit 51 includes a housing 53, a coil 54, a ferrite 55, a partition plate 56, a capacitor 57, and an O-ring 58.

[0035] The housing 53 comprises a housing body 61 and a lid 62. A through-hole 69, opening to the front and back surfaces of the housing 53, is located approximately in the center of the housing 53. The material of the housing 53 (housing body 61 and lid 62) is not particularly limited as long as it adequately protects the other components housed within the housing 53, as described later. Examples of materials for the housing 53 include polycarbonate and polypropylene.

[0036] In this embodiment, the housing body 61 houses a coil substrate 67 on which a coil 54 is arranged, a ferrite 55, a partition plate 56, and a capacitor substrate 68 on which a capacitor 57 is arranged. The housing body 61 has a first housing section 63 and a second housing section 64. The first housing section 63 is an annular recess located on one side of the housing body 61 and houses the coil substrate 67, the ferrite 55, and the partition plate 56. The plan view shape of the first housing section 63 is approximately an annular shape. The second housing section 64 is a recess located on the other side of the housing body 61 and houses the capacitor substrate 68 on which the capacitor 57 is arranged and a base 70. The number of second housing sections 64 is the same as the number of capacitor substrates 68. A cable groove 65 is formed between the first housing section 63 and the second housing section 64, on which a connecting cable (not shown) for connecting the capacitor 57 and the coil 54 is arranged.

[0037] The lid 62 covers the housing body 61. In this embodiment, the lid 62 is configured to be screwed to the housing body 61 via an O-ring 58.

[0038] The O-ring 58 hermetically seals the inside and outside of the housing 53. In this embodiment, the O-ring 58 is located on the housing body 61. In this embodiment, the O-ring 58 may also be located on the lid 62. As described above, through holes are provided in the front and back surfaces of the housing 53, approximately in the center of the housing 53. O-rings may also be installed around these through holes in the housing body 61, and the housing body 61 and the lid 62 may be screwed together to create an airtight seal.

[0039] The coil 54 is formed by winding a second Litz wire 66 in a spiral shape in a planar manner. The outer shape of the coil 54 is plate-shaped. In this embodiment, the coil 54 is fixed to the coil substrate 67 in order to maintain its shape. The planar shape of the coil substrate 67 is substantially the same as the planar shape of the first housing portion 63. That is, the planar shape of the coil substrate 67 is an annular shape. The method of fixing the coil 54 to the coil substrate 67 is not particularly limited. The coil 54 may be fixed to the coil substrate 67 with adhesive or with adhesive tape.

[0040] The second Litz wire 66 may have the same configuration as the first Litz wire 21, or a different configuration. The number of enameled wires 24 constituting the second Litz wire 66 may be the same, or different. Also, the twisting direction of the enameled wires 24 may be S (right) twist or Z (left) twist. In this embodiment, terminals for connecting to the capacitor 57 are connected to both ends of the second Litz wire 66 (not shown).

[0041] From the viewpoint of preventing condensation, it is preferable that the coil 54 is potted (sealed with resin) with respect to the coil substrate 67. The type of resin is not particularly limited as long as it can perform the above functions. Examples of resins include silicone resin, epoxy resin, and urethane resin. From the viewpoint of heat resistance, silicone resin is preferred.

[0042] Here, a heat cycle test was conducted to assess the heat resistance of the resin used in the potting process. Figure 6A shows the relationship between temperature and time in the heat cycle test, Figure 6B is a graph showing the relationship between the mass change rate (%) of the resin molded body and the number of heat cycles, and Figure 6C is a graph showing the relationship between the outer diameter change rate (%) of the resin molded body and the number of heat cycles. In Figures 6B and 6C, the black circle symbols indicate the results for silicone resin molded bodies, and the white circle symbols indicate the results for epoxy resin molded bodies. As shown in Figure 6A, the heat cycle involved lowering the temperature from room temperature to -20°C in 20 minutes, maintaining that temperature for 30 minutes, then raising the temperature from -20°C to 120°C in 60 minutes, maintaining that temperature for 30 minutes, and finally lowering the temperature from 120°C back to room temperature in 40 minutes. Thus, one cycle totaled 180 minutes. As shown in Figure 6B, the rate of change in mass of the molded resin was smaller for silicone resin compared to epoxy resin. Furthermore, as shown in Figure 6C, the rate of change in the outer diameter of the molded resin was smaller for silicone resin compared to epoxy resin.

[0043] Based on these results, it was found that silicone resin is preferable to epoxy resin as a material for potting.

[0044] The ferrite 55 directs and concentrates the magnetic field lines generated from the coil 54. As shown in Figure 5, the ferrite 55 is positioned on the back side of the coil 54. The ferrite 55 is formed in a plate shape, and its plan view shape is an annular shape. The ferrite 55 is positioned in the first housing section 63. The plan view shape of the ferrite 55 is the same as the plan view shape of the coil substrate 67 and the shape of the first housing section 63.

[0045] The partition plate 56 prevents discharge and adjusts the magnetic field by maintaining a constant distance between the coil 54 and the ferrite 55. The material of the partition plate 56 is not particularly limited as long as it can perform the above functions. Examples of materials for the partition plate 56 include polypropylene and polycarbonate. From the viewpoint of heat resistance up to 120°C, polypropylene is preferred for the partition plate 56. The thickness of the partition plate 56 is not particularly limited as long as it can perform the above functions. The thickness of the partition plate 56 is preferably in the range of 1 to 5 mm. For example, the thickness of the partition plate 56 is 2 mm. The partition plate 56 is placed in the first housing section 63. The plan view shape of the partition plate 56 is the same as the plan view shape of the coil substrate 67, the plan view shape of the ferrite 55, and the shape of the first housing section 63.

[0046] The partition plate 56 is positioned such that the distance between the coil 54 and the ferrite 55 is a predetermined distance. The partition plate 56 may be configured to allow adjustment of the distance between the coil 54 and the ferrite 55. For example, multiple partition plates 56 of different thicknesses may be prepared, and the distance between the coil 54 and the ferrite 55 may be adjusted by changing the partition plate 56.

[0047] The capacitor 57, together with the coil 54, forms a resonant circuit and generates a resonance phenomenon. In this embodiment, the capacitor 57 is a resonant capacitor. The capacitance and number of capacitors 57 are not particularly limited and are set appropriately according to the desired resonant frequency and the inductance of the coil 54. In this embodiment, multiple capacitors 57 are arranged on two capacitor boards 68. The capacitor boards 68 on which the multiple capacitors 57 are arranged are housed in the second housing section 64 while being supported by a base 70.

[0048] The capacitor board 68 has a capacitor 57 mounted on it and is supported by a base 70. Figure 7 is a perspective view of the base 70. As shown in Figure 7, the base 70 has a base body 72 and a plurality of legs 73.

[0049] The shape of the base body 72 is not particularly limited. In this embodiment, the plan view shape of the base body 72 is rectangular. The base body 72 has through holes 74 formed on the front and back surfaces. The through holes 74 reduce the amount of material used for the base 70 and facilitate the flow of resin, making the potting process (described later) of the capacitor 57 easier. The number of through holes 74 is not particularly limited. There may be one or more through holes 74. In this embodiment, there are nine through holes 74.

[0050] A busbar 47 is connected to the capacitor board 68 on which the capacitor 57 is placed, and it is fixed to the base 70. The capacitor 57, capacitor board 68, and base 70 are then potted while housed in the second housing section 64. The potting process may be performed selectively; for example, both the capacitor 57 and the capacitor board 68 may be potted, or only the capacitor 57 may be potted. Examples of materials used in potting include silicone resin, epoxy resin, and urethane resin. From the viewpoint of heat resistance, silicone resin is preferred as the material for potting. The reason why silicone resin is preferred is that, as mentioned above, the rate of change in mass and outer diameter of the resin molded product is smaller with silicone resin compared to epoxy resin. Although a graph is not shown here, in a heat cycle test, the change in capacitance of a capacitor sealed in silicone resin was smaller than the change in capacitance of a capacitor sealed in epoxy resin.

[0051] The legs 73 position the base 70 on which the capacitor board 68 is placed relative to the second housing 64. More specifically, the legs 73 position the height of the capacitor 57 in the second housing 64 and position its position in the planar direction within the second housing 64. The number of legs 73 is not particularly limited as long as they perform the above functions. In this embodiment, there are three legs 73. In this embodiment, the legs 73 are arranged on any first side surface of the base body 72 and on the second side surface opposite to the first side surface. In this embodiment, the first side is the inner side between the two base bodies 72 when the base 70 is placed in the second housing 64. Conversely, the second side is the outer side of the two base bodies 72 when the base 70 is placed in the second housing 64. In this embodiment, two legs are arranged on the first side, and one leg 73 is arranged on the second side.

[0052] The power transmission coil unit 51 can be assembled, for example, as follows. First, the O-ring 58 is placed in the housing body 61. The ferrite 55, the partition plate 56, and the coil substrate 67 to which the potted coil 54 is fixed are then placed in the first housing section 63 of the housing body 61 in this order. Furthermore, a capacitor board 68, on which a capacitor 57 is placed and a busbar 47 is connected, is housed in the second housing section 64 of the housing body 61. Next, the coil 54 and the capacitor board 68 are connected. Then, the capacitor board 68 on which the capacitor 57 is placed is potted. Finally, close lid 62.

[0053] The shielding unit 52 adjusts the resonant frequency of the coil 54. The shielding unit 52 consists of an aluminum plate 75 and a second housing 76 that houses the aluminum plate 75 (see Figure 4). The shielding unit 52 may consist only of the aluminum plate 75, and the second housing 76 may be omitted. The shielding unit 52 is located on the back side of the power transmission coil unit 51 and outside the housing 53, and is positioned at a predetermined distance from the ferrite 55. The shielding unit 52 may be configured so that the distance from the ferrite 55 is adjustable.

[0054] (effect) As described above, in the contactless power transmission device 12 of this embodiment, since the coil 54, capacitor 57, etc. are sealed with resin, it can operate properly even under condensation conditions. Therefore, the contactless power transmission device 12 of the present invention can operate stably without being affected by weather conditions. Furthermore, because the non-contact power supply device 12 has an insulating partition plate 56, it can properly transmit power to the coil unit on the receiving side. Therefore, the non-contact power supply device 12 of the present invention can operate stably.

[0055] [Embodiment 2] Next, a contactless power supply system according to Embodiment 2 of the present invention will be described. The contactless power supply system in this embodiment differs from the contactless power supply system 10 of Embodiment 1 in the method of connecting the power supply 11 and the contactless power transmission device 90. Therefore, the main points of difference from the contactless power supply system 10 of Embodiment 1 will be described, and similar components will be denoted by the same reference numerals and their descriptions will be omitted.

[0056] Figure 8 is an exploded perspective view of the contactless power transmission device 90. Figure 9A is a cross-sectional view of the connection between the connector-equipped cable 13 and the contactless power transmission device 90, and Figure 9B is a cross-sectional view of the connection between two connector-equipped cables 13.

[0057] The contactless power supply system according to this embodiment comprises a power supply 11 (see Figure 1), a contactless power transmission device 90, and a contactless power receiving device 15 (see Figure 1). The power supply 11 and the contactless power transmission device 90 are connected by a cable 13 with a connector. As shown in Figures 8 and 9A and 9B, in this embodiment, a first connector 31 for connecting to the contactless power transmission device 90 is provided at the end of the connector-equipped cable 13 on the contactless power transmission device 90 side. The first connector 31 connects to the second connector 91 fixed to the housing 53, thereby connecting the power supply 11 and the contactless power transmission device 90. At this time, it is preferable to provide a first flat packing 33 between the opposing surfaces of the first connector 31 and the second connector 91 (see Figure 9A).

[0058] As shown in Figure 9A, the second connector 91 has a second conductive member 92 and a second cover 43. The second conductive member 92 has a second tip portion 45 and a second cylindrical portion 93. The second cylindrical portion 93 has a tapered surface 38 and a through hole 39. The first Litz wire 21 is inserted into the second cylindrical portion 93. The second conductive member 92 and the first Litz wire 21 are connected by fusing. The fusing procedure is the same as the fusing procedure for the first Litz wire 21 and the first conductive member 34 described above, so its explanation is omitted. The end of the first Litz wire 21 opposite to the second connector 91 is connected to the capacitor board 68.

[0059] Furthermore, in this embodiment, a third connector 94 and a fourth connector 95 are positioned in the middle of the first connection line 17. That is, the third connector 94 and the fourth connector 95 are positioned between one first connection line 17 and the other first connection line 17. In this embodiment, a third connector 94 is provided at one end of the first connecting wire 17, and a fourth connector 95 is provided at the other end of the first connecting wire 17. Thus, in this embodiment, the connector-equipped cable 13 comprises a first cable including the first Litz wire 21 and the third connector 94, and a second cable including the first Litz wire 21 and the fourth connector 95.

[0060] As shown in Figure 9B, the third connector 94 is the same as the first connector 31.

[0061] The fourth connector 95, like the second connector 91, has a second conductive member 92 and a second cover 99. The second cover 99 covers the second conductive member 92. The second conductive member 92 has a second tip portion 45 and a second cylindrical portion 93. The second tip portion 45 is formed in a cylindrical shape into which the first tip portion 36 of the first conductive member 34 is inserted. By inserting the first tip portion 36 into the second tip portion 45, the first conductive member 34 of the third connector 94 and the second conductive member 92 of the fourth connector 95 are electrically connected. Furthermore, the first Litz wire 21 is inserted into the second cylindrical portion 93. The second conductive member 92 and the first Litz wire 21 are connected by fusing. The fusing procedure is the same as the fusing procedure for the first Litz wire 21 and the first conductive member 34 described above, so its explanation is omitted. In this embodiment, the second cover 99 of the fourth connector 95 is made of a resin composition containing polyetheretherketone, glass fiber reinforced nylon 66, etc., from the viewpoint of heat resistance.

[0062] (effect) As described above, the connector-equipped cable 13 of this embodiment has the same effects as the connector-equipped cable 13 of Embodiment 1, in addition to the effect of being easier to replace. For example, even if the contactless power transmission device 90 is buried underground, the connector-equipped cable 13 between the power supply 11 and the third connector 94 can be easily replaced as long as the third connector 94 and the fourth connector 95 are located above ground. [Industrial applicability]

[0063] The contactless power transmission device of the present invention is useful, for example, for contactless power supply to automobiles. [Explanation of symbols]

[0064] 10. Contactless power supply system 11 Power supply 12.90 Contactless power transmission device 13 Cables with connectors 14 Electric Vehicles 15. Contactless power receiving device 16 batteries 17. First connection line 21. The First Ritz Line 22 Insulating layer 23 Sheath Layer 24 Enamel wire 25 copper wire 26 Insulating coating 31 First Connector 32, 91 Second connector 33. First flat packing 34, 96 First conductive member 35 First Cover 36, 97 1st tip 37 First cylinder part 38 Tapered surface 39, 74 through holes 40. Main body of the first cover 41 Fastening members 42, 92 Second conductive member 43, 99 Second cover 44. Second flat packing 45 Second tip 46, 93 Second cylinder part 47 Bus Bar 48 First Mark 49 Second Mark 51 Power transmission coil unit 52 Shielding Unit 53 Housing 54 coils 55 Ferrite 56 Partition Plates 57 Capacitors 58 O-rings 61 Housing body 62 Lid 63. First Detention Unit 64 Second Detention Unit 65 Cable groove 66. The Second Ritz Line 67 Coil board 68 Capacitor board 69 Through hole 70 base 72 Base 73 Legs 75 Aluminum plate 76 Second Housing 94 Third connector 95 Fourth connector

Claims

1. A coil wound with Litz wire, It has a capacitor board on which capacitors are arranged, The coil is sealed with a first resin, The first resin is composed solely of silicone resin. A non-contact power transmission device characterized in that the capacitor and the capacitor substrate are sealed with a second resin.

2. In the contactless power transmission device according to claim 1, The capacitor board further has a base for supporting the capacitor board, The contactless power transmission device is characterized in that the base is also sealed with the second resin.

3. In the contactless power transmission device according to claim 2, The contactless power transmission device is characterized in that the base has multiple through holes opening on its front and back sides for flowing the second resin.

4. In a non-contact power transmission device according to any one of claims 1 to 3, A non-contact power transmission device characterized in that the second resin is made of silicone resin.

Images