JP2000133058A - Feeding cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable capable of inhibiting a heat generation at the time of charging and having an excellent low cost and handling property. SOLUTION: The feeding cable 2 is constituted of an outgoing passage 6, a coaxial cable 9 provided with a plurality of conductors 7a, 7b, and a return passage 10. The conductive wires 7a, 7b are fixed in a state coaxially disposed making the outgoing passage 6 as a center and a heat generation caused by an electric resistance of the conductors 7a, 7b at the time of charging is cooled. The return passage 10 is helically wound on an outer periphery of the coaxial cable 9 and distributes a cooling water flowing in the outgoing passage 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply cable for charging a battery.

[0002]

2. Description of the Related Art In general, an electric vehicle is charged by coupling a power transmitting coupler provided at the end of a power supply cable of a power supply device installed on the ground to a power receiving coupler mounted on the electric vehicle. Then, charging is performed. Specifically, the power supply device converts a commercial AC power supply or the like into a voltage and a frequency, and converts the voltage into a high frequency of 430 V (100 kHz to 3 kHz).
(70 kHz) power is supplied to the primary coil of the power transmission side coupler via a power supply cable.

As a charging device for such an electric vehicle, a high-power (for example, 80 kW) type charging device has been developed to shorten the charging time, that is, to perform quick charging.

[0004] However, with the increase in power of the charging device, a high-frequency large current flows through the power supply cable, and heat generation of the cable becomes a problem. For this reason, conventionally, a cooling water channel is provided in the power supply cable to prevent the cable from generating heat.

FIG. 5 is a cross-sectional view of a power supply cable applied to a high-power (for example, 80 kW) type charging device. As shown in FIG.
Numeral 0 is formed so as to be a forward waterway 31, a conductor (shielded wire) 32, an insulating layer 33, a conductor (shielded wire) 34, a return waterway 35, and an insulating layer 36 from the center side thereof.
In other words, in the power supply cable 30 shown in FIG. 5, the cylindrical outward waterway 3 is provided inside and outside the annular conductors 32 and 34.
1 and an annular return water channel 35 are formed coaxially, so that the cooling water flows through the outward water channel 31 and circulates in the power transmitting coupler (not shown), and then flows through the return water channel 35. As described above, the cooling water flows through the outward water passage 31 and the return water passage 35 to cool the conductors (shield wires) 32 and 34.

[0006]

By the way, the charging of the electric vehicle is performed by coupling the power transmitting coupler provided at the end of the power supply cable 30 of the power supply device to the power receiving coupler mounted on the electric vehicle. Since charging is performed, the power supply cable 30 receives an external force such as bending, twisting, or pulling when charging.

However, in the power supply cable 30, the diameter of the cable 30 becomes large because the cylindrical outward water path 31 and the annular return water path 35 are formed coaxially, and the flexibility and bending resistance are increased. And it was difficult to handle. That is, the power supply cable 30 as shown in FIG.
In this case, it is necessary to reinforce each of the water passages 31 and 35 so as not to be crushed. In particular, in order to prevent the annular return water passage 35 from being crushed, a special reinforcing member is required. For this reason, there arises a problem that the manufacture of the power supply cable 30 is technically difficult and the cost is increased.

An object of the present invention is to provide a power supply cable which can suppress heat generation during charging, and which is excellent in cost and handling.

[0009]

According to a first aspect of the present invention, a conductor for supplying electric power and a first cooling passage through which a coolant for cooling heat generated by electric resistance of the conductor flows are coaxially arranged. It is characterized in that a coaxial cable formed and a second cooling passage provided separately from the coaxial cable and through which the cooling liquid flowing through the first cooling passage flows are provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the conductor is a plurality of conductors, and is arranged concentrically around the first cooling passage. .

According to a third aspect of the present invention, in the second aspect of the invention, the plurality of conductors supply AC power to a power supply member, and one end of the power supply member is provided. And a conductor connected to the other end of the power supply member is alternately arranged around the first cooling passage.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the second cooling passage is spirally wound around the outer periphery of the coaxial cable. In the invention according to claim 5, in the invention according to claim 1,
The second cooling passage is fixed in parallel with and in contact with the coaxial cable.

According to the first aspect of the present invention, the first cooling passage is provided coaxially with the conductor, and the heat generated by the electric resistance of the conductor is cooled by the coolant flowing through the first cooling passage. Then, a second cooling passage is provided separately from the coaxial cable, and the coolant flowing through the first cooling passage flows through the second cooling passage. As a result, conventionally, the first cooling passage and the second cooling passage are formed coaxially,
Although the diameter is large and the bending resistance is inferior and the like, it is difficult to handle. However, since the second cooling passage is provided separately from the coaxial cable, the diameter can be reduced and the handling becomes easy. In addition, there is no need to provide a special reinforcing member as in the related art, and the cost is excellent.

According to the invention described in claim 2, according to claim 1,
In addition to the operation of the invention described in (1), a plurality of conducting wires are arranged concentrically around the first cooling passage. as a result,
The flexibility and the bending resistance of the cable can be improved, and the cable can be easily handled. In addition, since the first cooling passage is arranged at the center of the coaxial cable in which heat is easily stored, the cooling efficiency can be improved.

According to the invention described in claim 3, according to claim 2
In addition to the operation of the invention described in the above, when the AC power is supplied to the power supply member, the direction of the current flowing in the adjacent conductor is reversed. That is, the impedance of the cable can be reduced. Therefore, it is possible to handle higher frequency and higher power. further,
Since the bias of the current can be suppressed, the cooling efficiency can be improved.

According to the invention described in claim 4, according to claim 1 of the present invention,
In addition to the effect of the invention described in the above, the second cooling passage is spirally wound around the outer periphery of the coaxial cable provided with the first cooling passage. As a result, heat transmitted from the conductor to the outer peripheral surface of the coaxial cable can be cooled by the second cooling passage.

According to the invention described in claim 5, according to claim 1,
In addition to the effect of the invention described in (1), the second cooling passage is fixed in parallel with and in contact with the coaxial cable.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a power supply cable applied to a non-contact type charging device will be described in detail with reference to FIGS.

As shown in FIG. 1, the contactless charging device according to the present embodiment includes a power transmission side coupler 3 provided at a tip of a power supply cable 2 from a power supply device 1 installed on the ground side, And a power receiving side coupler 5 mounted on the electric vehicle 4. In order to charge the electric vehicle 4 in the present embodiment, as shown in FIG. 1, the vehicle 4 is parked in a garage where the power supply device 1 is installed, and the power transmission coupler 3 is inserted into the vehicle-mounted power reception coupler 5. Charging is performed.

Specifically, the power supply device 1 converts a commercial AC power supply or the like into a voltage and a frequency, and outputs, for example, 430 V, 3
A high-frequency power of 70 kHz is supplied to the power transmission side coupler 3 via the power supply cable 2. Further, the power supply device 1 is provided with a cooling pump (not shown), so that heat generated by the power supply cable 2 and heat generated by the power transmission side coupler 3 can be cooled by using cooling water from the cooling pump.

More specifically, as shown in FIG. 2, the power supply cable 2 includes a coaxial cable 9 composed of an outgoing water channel 6, conducting wires (conductors) 7a and 7b, and a sheath 8, and a returning water channel 10. I have. More specifically, in the coaxial cable 9, eight conductors 7 a and 7 b covered with an insulator are fixed by a resin sheath 8 in a state where the conductors 7 a and 7 b are arranged concentrically around a circular outgoing water channel 6 made of a resin material. ing. Further, in the power supply cable 2 of the present embodiment, the return waterway 10 formed in a tubular shape by a resin material is spirally wound in a state of contacting the outer peripheral surface of the coaxial cable 9.

The power supply cable 2 is separated from the lead wires 7a and 7b, the outgoing water passage 6 and the return water passage 10 at the branch portion 11 shown in FIG.
Are bundled in the conductor cable 12. Lead cable 12,
The outward waterway 6 and the return waterway 10 are connected to the power transmission coupler 3 respectively. In addition, 1 described later
The conductor 7a connected to one end of the secondary coil 16 and the conductor 7b connected to the other end of the primary coil 16 are alternately arranged as shown in FIG. 2, and the impedance (reactance) of the power supply cable 2 Is designed to be smaller. That is, when the AC power is supplied to the power supply cable 2, the direction of the current flowing through the conductor 7a is opposite to the direction of the current flowing through the conductor 7b.

Here, the power transmitting side coupler 3 is shown in FIG.
This will be described in detail with reference to FIG. FIG. 3A is a plan view of the power transmission coupler 3, and FIG. 3B is a cross-sectional view of the power transmission coupler 3 taken along the line AA in FIG.

As shown in FIG. 3A, the power transmission side coupler 3 includes a ring-shaped primary coil substrate 13, a cylindrical power transmission side core (ferrite core) 14, and a power transmission side coil cover 15. The primary coil substrate 13 is a multilayer substrate obtained by laminating a copper foil on an insulating substrate. In the present embodiment, the primary coil 16 is formed of four copper foils. Specifically, four substantially C-shaped copper foils serving as the primary coil 16 are laminated via an insulating substrate, and the ends thereof are electrically connected to each other by through holes, so that the copper foil between the respective layers is formed. It is formed so that the flowing current becomes spiral. In addition, an insulating film that covers the primary coil 16 is formed on the front and back surfaces of the primary coil substrate 13. Furthermore, the primary coil substrate 1
3 is provided with a terminal portion 13a, and a copper foil extending from the primary coil 16 is laminated on the surface of the terminal portion 13a. Then, the conductor cable 1 branched from the power supply cable 2 of the power supply device 1 described above is connected to the terminal portion 13a.
2 are electrically connected. Specifically, the conducting wire 7a is connected to the terminal 13a on the surface of the primary coil substrate 13, which is one end of the primary coil 16, and the conducting wire 7b is the other end of the primary coil 16, It is connected to the terminal portion 13a on the back surface of the coil substrate 13.

The power transmission side coil cover 15 is shown in FIG.
As shown in (b), the cover member is composed of two cover members made of insulating resin, and an insertion port 17 and an inflow port 1 are provided at the rear end side of the cover member.
8 and outlet 19 and opening 20 for forming a gripper
Is provided. Then, as shown in FIG. 3 (a), the lead wire cable 12 is inserted into the insertion port 17,
The outgoing waterway 6 and the returning waterway 10 are connected to the outlet 8 and the outlet 19, respectively. Further, a circular opening 21 is provided at the front end side of the power transmission side coil cover 15, and the power transmission side core 14 is inserted into the opening 21.

Further, on the inner surface of the power transmission side coil cover 15, a groove 23 forming a cooling water channel 22 is provided on the periphery of the opening 21, and the partition 2 in the groove 23 is formed.
4, an inflow passage 25 and an outflow passage 26 extend from both sides to the inflow port 18 and the outflow port 19. FIG.
As shown in (b), storage grooves 27 are formed on both sides of the groove 23 to fix the ends of the primary coil substrate 13 in a fitted state. Then, the primary coil substrate 13 to which the conductor cable 12 is connected is housed between the cover members of the power transmission side coil cover 15, and the power transmission side core 14 is inserted into the opening 21, and the two cover members are pressed against each other. The power transmission side coupler 3 is formed by joining by sonic welding.

When the power transmitting side coupler 3 is formed by joining the two cover members, FIGS. 3 (a) and 3 (b)
As shown in FIG. 3, a cooling water passage 22 is formed therein, and the cooling water flowing from the inlet 18 circulates in the cooling water passage 22 in the direction indicated by the dotted arrow in FIG.
Flow out of 9. That is, as shown in FIG. 3B, heat generated by the primary coil 16 can be cooled by the cooling water flowing on the front and back of the primary coil substrate 13.

The outgoing water passage 6 and the return water passage 10 of the power supply cable 2 are connected to a cooling pump, and by driving the pump, the outgoing water passage 6 → the power transmission side coupler 3
The cooling water circulates from the cooling water passage 22 to the return water passage 10 in the inside.

Next, the operation of the present embodiment configured as described above will be described. First, an operator couples the power transmitting coupler 3 to the power receiving coupler 5 provided on the vehicle 4 as shown in FIG. That is, the power transmission side core 14 and the primary coil 16 of the power transmission side coupler 3 and the power reception side core and the secondary coil of the power reception side coupler 5 are electrically connected in a non-contact state. Thereafter, the power supply device 1 connects the primary coil 16 of the power transmission side coupler 3 via the power supply cable 2 to the primary coil 16 at 430 V, 370 kHz.
The cooling pump is driven at the same time when the high frequency power of z is supplied.

At this time, the conducting wires 7a,
Although the conducting wires 7a and 7b generate heat because a high frequency high current flows through the conducting wire 7b, the cooling water flows through the outward water passage 6 when the cooling pump is driven, so that the conducting wires 7a and 7b are efficiently cooled. Further, the cooling water flowing through the outward water channel 6 circulates through the cooling water channel 22 in the power transmission side coupler 3 and
The heat generated by the next coil 16 is also cooled and flows out to the return waterway 10. The cooling water flowing through the return water channel 10 spirally flows on the outer peripheral surface of the coaxial cable 9, and the conductive wires 7 a and 7
The heat transmitted from b to the sheath 8 is cooled and discharged to the cooling pump side.

As described above, the present embodiment has the following features. (1) AC power is supplied to the primary coil 16 of the power transmission side coupler 3 via the power supply cable 2 to charge the vehicle-mounted battery. At this time, power loss occurs due to the electric resistance of the conductors 7a and 7b, and the cable 2 generates heat. However, the outward water passage 6 as a first cooling passage is provided coaxially with the conductors 7a and 7b. Heat generated in the conductive wires 7a and 7b is cooled by the cooling water flowing as the cooling liquid. Then, the cooling water flowing through the outward water passage 6 circulates through the cooling water passage 22 in the power transmission side coupler 3 and cools the heat generated by the primary coil 16. Further, the cooling water flows through the return passage 10 formed by being spirally wound around the outer peripheral surface of the coaxial cable 9, thereby cooling the heat transmitted from the conductors 7 a and 7 b to the sheath 8 of the coaxial cable 9. I do. As a result, as shown in FIG. 5, in the conventional power supply cable 30, since the cylindrical outward water passage 31 and the annular return water passage 35 are formed coaxially, the diameter becomes large and the bending resistance is inferior. Although it was difficult, the diameter of the power supply cable 2 of the present embodiment can be reduced by providing the return path 10 separately from the coaxial cable 9, thereby facilitating the routing. In addition, return waterway 10
Is wound around the outer peripheral surface of the coaxial cable 9, thereby improving the cooling efficiency and making it easy to handle.

Therefore, heat generation during charging can be suppressed, and handleability can be improved. In addition to this, there is no need to provide a special reinforcing member as in the related art, and furthermore, a member that is widely used can be used, so that the cost is excellent. (2) The coaxial cable 9 is formed in a state where the conducting wires 7a and 7b are arranged concentrically around the outgoing water channel 6. As a result, the flexibility and bending resistance of the power supply cable 2 can be improved, and the maneuverability is excellent. Further, since the outward water channel 6 is arranged at the center of the coaxial cable 9 where heat is easily stored, cooling efficiency can be improved, and heat generation of the power supply cable 2 can be prevented. (3) The conducting wire 7a is a primary coil 16 as a power supply member.
The conductor 7b is connected to the other end of the primary coil 16 and the conductor 7a and the conductor 7b are alternately arranged in the coaxial cable 9 as shown in FIG. . As a result, when AC power is supplied to primary coil 16, the direction of the current flowing through conductor 7b is opposite to the direction of the current flowing through conductor 7a. That is,
Since the impedance (reactance) of the power supply cable 2 is reduced, power loss in the power supply cable 2 can be suppressed. Therefore, it is possible to handle higher frequency and higher power. Furthermore, since the bias of the current flowing through the power supply cable 2 can be suppressed, the cooling efficiency can be improved.

The embodiment of the present invention is not limited to the above embodiment, but may be implemented as follows. In the above embodiment, the return waterway 10 is wound around the outer peripheral surface of the coaxial cable 9, but as shown in FIG. 4, the return waterway 10 is clamped on the outer peripheral surface of the coaxial cable 9 by using a clamp 28. If they are fixed in a state of being parallel and in contact with each other, handleability is improved, which is practically preferable.
The interval at which the clamp 28 is provided is, for example, 30.
About 0 mm, based on the diameter of the coaxial cable 9,
It is sufficient to select an interval that does not hinder the operation.

In the above embodiment, the outgoing water passage 6 is provided as the first cooling passage at the center of the coaxial cable 9.
The return waterway 10 may be provided as the first cooling passage at the center of the coaxial cable 9 for implementation.

In the above embodiment, cooling water is used as the cooling liquid. However, the present invention is not limited to this. For example, cooling water may be used using insulating oil. By doing so, the primary coil substrate 1
3 can be carried out in a case where no insulating film is formed. That is, the primary coil 16 is
Can be housed in the power transmission side coupler 3 in a state where the power transmission side coupler 3 is exposed, and the power transmission side coupler 3 can be made thinner.

In the above embodiment, the power transmission side coil cover 15 is formed by joining two members by ultrasonic welding. However, the power transmission side coil cover 15 is formed by molding using a molding resin. Is also good.

In the above embodiment, as shown in FIG. 2 and FIG.
Although a space is formed between the conductors 7a and 7b and between the conductors 7a and 7b and the sheath 8, the space may be filled with a resin material having good heat conductivity. In this way, the heat generated by the conductors 7a and 7b can be efficiently transmitted to the outward waterway 6 and the sheath 8, and the cooling performance can be improved. Further, the resin material to be filled and the sheath 8 may be integrally formed.

In the above-described embodiment, the inductive contactless charging device in which the power transmitting coupler 3 on the ground side and the power receiving coupler 5 on the vehicle are electrically charged in a non-contact state has been embodied. However, the present invention is not limited to this, and may be embodied in, for example, a conductive type charging device that performs charging by electrically connecting a power source on the ground and a charging device on the vehicle with metal fittings or the like.

○ As in the above embodiment, the electric vehicle 4
However, the present invention is not limited to this, and the present invention may be applied to a power supply cable 2 applied to a device that handles a large current and a high frequency.

The technical idea grasped from the above embodiment and not described in the claims is described below together with its effects. (A) The power supply cable according to any one of claims 1 to 5 is used on the ground side in a non-contact charging device. According to this configuration, the cooling water can be commonly used for cooling a member of the charging device on the ground side, for example, a power transmission side coupler or the like.

[0041]

According to the first aspect of the present invention, heat generation during charging can be suppressed, and cost and handling can be improved.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the heat generation of the cable can be suppressed, and the cable has excellent maneuverability. According to the third aspect, in addition to the effect of the second aspect, it is possible to prevent heat generation of the conductor.

According to the invention described in claim 4, according to claim 1
And the cooling efficiency can be improved. According to the invention described in claim 5, in addition to the effect of the invention described in claim 1, the handleability of the cable can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a charging device according to an embodiment.

FIG. 2 is a perspective view of a power supply cable according to the embodiment.

FIG. 3A is a plan view of a power transmission side coupler, and FIG.

FIG. 4 is a perspective view of a power supply cable according to another embodiment.

FIG. 5 is a cross-sectional view of a power supply cable according to the related art.

[Explanation of symbols]

2 ... power supply cable, 6 ... outgoing waterway as first cooling passage, 7a, 7b ... conductor as conductor, 9 ... coaxial cable, 10 ... return waterway as second cooling passage, 16
... A primary coil as a power supply member.

Claims (5)

[Claims] 1. A coaxial cable in which a conductor for supplying electric power and a first cooling passage for flowing a cooling liquid for cooling heat generated by electric resistance of the conductor are formed coaxially, and separately provided for the coaxial cable. And a power supply cable having a second cooling passage through which a cooling liquid flowing through the first cooling passage flows. 2. The power supply cable according to claim 1, wherein the conductor is a plurality of conductors, and is arranged concentrically with the first cooling passage as a center. 3. The power supply cable according to claim 2, wherein the plurality of conductors supply AC power to a power supply member, and are connected to one end of the power supply member. And a conducting wire connected to the other end of the power supply member, the power supply cable being arranged alternately around the first cooling passage. 4. The power supply cable according to claim 1, wherein the second cooling passage is spirally wound around an outer periphery of the coaxial cable. 5. The power supply cable according to claim 1, wherein the second cooling passage is fixed in parallel with and in contact with the coaxial cable.