JPH07226112A - Electric charge cable for electric vehicle - Google Patents

Abstract

PURPOSE:To obtain a flexible, inexpensive power charge cable. CONSTITUTION:A plurality of collected twisted wires 11a composed by twisting a plurality element wires of 0.10 to 0.32mm in their diameter are further twisted to form composite wire 11b its, a wire core 11 is constituted by forming an insulation coating 11c outside the composite wire 11b, and the three wire cores 11 are twisted at a twisting pitch by 10 to 20 times the size of the layer core diameter. A sheath 12 composed of a polyvinyl chloride resin composition containing a polyester plastic agent on its outside is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging cable for an electric vehicle used for charging a battery which is a drive source for the electric vehicle.

[0002]

2. Description of the Related Art The power scale of a power system of an electric vehicle is usually a voltage value of 600 V or less and a current value of about 30 to 400 A,
The outer diameter of the cable used is 10 mm or more, and when it is large, it is 30 mm or more.

When charging the battery of such an electric vehicle, as shown in FIG. 7, an outdoor charging facility 1 is used.
The household outlet 2 and the battery of the electric vehicle 3 must be connected by the charging cable 4, but since the outer diameter of the charging cable 4 becomes large as described above, the charging cable 4 must be flexible. It is extremely difficult to handle, therefore, it is necessary to use as the charging cable 4 a storage space that can be made as small as possible and that does not lose flexibility even in low temperatures such as cold regions.

[0004]

By the way, it is considered that a cabtyre cable is conventionally used as a charging cable for an electric vehicle because of its excellent flexibility and the relationship with the working voltage value. There are a rubber cabtire cable using rubber and a vinyl cabtire cable using polyvinyl chloride (PVC) depending on the type of coating material, and each has advantages and disadvantages.

That is, although the rubber cabtyre cable has excellent flexibility, it is disadvantageous in terms of manufacturing cost because the material cost is high and an extra vulcanization step is required, while the vinyl cabtyre cable is rubber cabtyre. It is slightly inferior in flexibility to the cable, and although PVC as a covering material is hardened at a low temperature of 0 to -20 ° C, it is advantageous in that it is cheaper than the rubber cabtire cable, but both are electric. Not suitable as a charging cable for automobiles.

The present invention has been made in view of the above points, and an object thereof is to provide a charging cable which is excellent in flexibility and is inexpensive.

[0007]

The invention according to claim 1 is
A charging cable for an electric vehicle having a nominal cross-sectional area of 5.5 mm ² or less, which is used for charging a battery for driving an electric vehicle, and a plurality of cores twisted at a twist pitch of 10 to 20 times the core diameter And a sheath formed on the outer side of each of the cores, and each of the cores has a wire diameter of 0.
A plurality of stranded wires formed by twisting a plurality of 10-0.32 mm strands are further twisted, and an insulating coating is formed on the outer side thereof, and the sheath is made of a polychlorinated material containing a polyester plasticizer. Since it is made of a vinyl resin composition, it is suitable for connection between a household outlet and a battery.

According to the second aspect of the present invention, there is provided a charging cable for an electric vehicle having a nominal cross-sectional area of more than 5.5 mm ² used for charging a battery for driving the electric vehicle, the layer core diameter of which is 10 to 10. It is composed of a plurality of wire cores twisted at a twist pitch of 20 times and a sheath formed outside each of the wire cores, and each of the wire cores has a wire diameter of 0.10 to 0.26 mm. A plurality of assembled stranded wires formed by twisting a plurality of strands are further twisted, and an insulating coating is formed on the outer side thereof, and the sheath is made of a polyvinyl chloride resin composition containing a polyester plasticizer. It is suitable for connecting an outdoor charging facility and a battery.

At this time, as the polyvinyl chloride resin composition, polyvinyl chloride, a copolymer or graft copolymer mainly containing vinyl chloride, or an acrylonitrile-butadiene copolymer rubber mainly containing vinyl chloride resin is used. It is desirable to use a polymer blend obtained by blending the above.

As the polyester plasticizer,
The polyester-based plasticizer may be a polycondensation product of a polyhydric carboxylic acid and a polyhydric alcohol, the end of which is blocked with a monohydric alcohol.

Further, the polyvinyl chloride resin 100
70 to 12 parts by weight of the polyester plasticizer with respect to parts by weight.
Addition of 0 parts by weight is effective for improving flexibility.

[0012]

【Example】

(First Embodiment) FIG. 1 is a sectional view of a first embodiment of the present invention, showing a case where the present invention is applied to a device having a nominal sectional area of 5,5 mm ² or less.

In FIG. 1, reference numeral 11 denotes a wire core, and a plurality of strands 11a formed by twisting a plurality of strands having a diameter of 0.10 to 0.32 mm are further twisted to form a composite twisted wire 11b. The insulating core 11c is formed on the outer side of the composite stranded wire 11b to form the wire core 11.

The three wire cores 11 have a layer core diameter of 10
The sheath 12 is twisted at a twist pitch of up to 20 times, and a sheath 12 is formed on the outer side thereof. The sheath 12 is made of a polyvinyl chloride resin composition containing a polyester plasticizer.

At this time, as for each strand, one having a smaller diameter is easier to bend than one having a larger diameter, and a strand having a small strand diameter and a large number of strands has the same nominal cross-sectional area. As shown in FIG. 2, when bent, it has a bend and is flattened into an elliptical shape, so it is easy to bend. On the other hand, a wire with a large wire diameter and a small number of wires is difficult to flatten as shown in FIG. Hateful. However, FIG. 2 (c) is A of FIG. 2 (b).
FIG. 3C shows a cross section taken along line A-A ′, and FIG.
3 shows a cross section taken along line BB ′ of FIG.

In consideration of these points, in the case of a cable having a nominal cross-sectional area of 5.5 mm ² or less, the strand diameter is preferably 0.1 to 0.32 mm, and the strand diameter is 0, as described above. If it is smaller than 10 mm, the flexibility of the entire cable is the same as when using a 0.10 mm wire, but there are difficulties in terms of manufacturing costs, and conversely, if the wire diameter is 0.32 mm or less. When it is large, the hardness of the wire itself affects the flexibility of the entire cable.

Therefore, the wire diameter of a charging cable for an electric vehicle having a nominal cross-sectional area of 5.5 mm ² or less is 0.10 to
0.32 mm is suitable.

When the conductor structure of a normal cabtire cable in each nominal cross-sectional area as shown in Table 1 is made to correspond, the cable of this embodiment has a value of 0.
As a usage example of the 18 mm strand, the conductor configuration is as shown in Table 2.

[0019]

[Table 1]

[0020]

[Table 2]

Regarding the twist pitch of each wire core 11, if the twist pitch is too large as shown in FIG. 4, the flexibility of the entire cable is lost, and some wire cores 11 may protrude from the cable end surface. Therefore, as shown in FIG. 5, it is necessary to set a twist pitch sufficiently small for necessary bending, and it is preferable to twist each wire core 11 at a twist pitch of 10 to 20 times the core diameter, When the twist pitch is smaller than 10 times, the twist is increased and the productivity is poor. On the contrary, when the twist pitch is larger than 20 times, each strand is linear and the flexibility of the cable is lost.

Therefore, the twist pitch of each core 11 of the charging cable for an electric vehicle having a nominal cross-sectional area of 5.5 mm ² or less is
In order to keep the flexibility of the cable, as described above, 10 to 20 times the core diameter is preferable.

Next, the material of the sheath 12 will be described.

As described above, the sheath 12 is made of a polyvinyl chloride resin composition containing a polyester plasticizer. The polyvinyl chloride resin composition contains not only polyvinyl chloride but also vinyl chloride. Either a copolymer or a graft copolymer mainly composed of a vinyl chloride resin or a polymer blend obtained by blending an acrylonitrile-butadiene copolymer rubber (NBR) mainly composed of a vinyl chloride resin is included.

Further, examples of the above-mentioned copolymerizable comonomer include vinylidene chloride, ethylene, propylene, acrylonitol, vinyl acetate, maleic acid, acrylic acid, methacrylic acid, maleic acid ester, acrylic acid ester and methacrylic acid. Examples thereof include esters.

As the polyester-based plasticizer, polycarboxylic acids such as adipic acid, azelaic acid, sebacic acid, phthalic acid and terephthalic acid, ethylene glycol, 1,2-propylene glycol and 1,2-butylene are used. Glycol, 1,3-butylene glycol, 1,4
It is desirable that the end of a polycondensate with a polyhydric alcohol such as butylene glycol is blocked with a monohydric alcohol such as 2-ethylhexanol, n-octanol or nonanol.

Then, the polyvinyl chloride resin 10 described above is used.
The above polyester-based plasticizer is usually added in an amount of 30 to 200 parts by weight with respect to 0 parts by weight, but it is particularly preferable to add a polyester-based plasticizer in an amount of 70 to 120 parts by weight in order to obtain flexibility.

This polyester plasticizer is for imparting oil resistance, grease resistance and lubricating oil resistance, which are extremely important factors for charging cables for electric vehicles, and the molecular weight is usually 500 to 8000. It is preferable to use a polycondensate of 1500 to 4000.

If necessary, an epoxy compound, a heat resistance stabilizer, an antioxidant, a flame retardant, a lubricant, a filler, a coloring agent, etc. may be added to the above polyvinyl chloride resin composition.

By the way, the respective sheathing agents were blended in the proportions shown in Table 3, and the ingredients were uniformly dispersed by kneading them with a Banbury mixer at a temperature of up to about 180 ° C. The pellets are pelletized by an extruder for granules, and the obtained pellets are extruded by an extruder for coating electric wires to form a cable having a structure as shown in FIG. 1, for example, and the cable is tested in accordance with JIS C 3005 18.1. When pieces were prepared and subjected to an oil resistance test according to JIS C 300520, the results shown in Tables 4 and 5 were obtained. Here, as PVC (polyvinyl chloride) in Table 3, TK2500L manufactured by Shin-Etsu Chemical, and PN-650 adipic acid manufactured by Asahi Denka Co., Ltd. as polyester plasticizers
4-butylene glycol, epoxidized soybean oil Asahi Denka O-130P, heat stabilizer Asahi Denka RUP-
14. Nitto Koka NS-400 is used as the filler, and Goodyear Chemi-Gum P-83 is used as the NBR.

[0031]

[Table 3]

[0032]

[Table 4]

[0033]

[Table 5]

The numerical values shown in Tables 4 and 5 show the values when the initial state is 100%. From the results of Tables 2 and 3, when the sheath material of the present invention is used (Example 1) ，
As can be seen by comparing with Example 2) and Comparative Examples 1 and 2, the tensile strength and the elongation show stable and favorable numerical values.

With respect to the cable having the above-mentioned structure, the force required to bend the cable 180 ° along a cylinder having a diameter of 8 times is obtained at each temperature of 20 ° C, 0 ° C and -20 ° C. When measured and compared with general vinyl cabtyre cables and rubber cabtyre cables having the same nominal cross-sectional area, the results are as shown in Table 6. According to the configuration of the present embodiment, vinyl cabtyre cables and rubber cabtyre cables are obtained. It turns out that it is more flexible than.

[0036]

[Table 6]

Since a polyvinyl chloride resin composition is used as the sheath material, it is cheaper than rubber.

Therefore, according to the first embodiment, it is possible to inexpensively provide a charging cable for an electric vehicle having a nominal cross-sectional area of 5.5 mm ² or less, and particularly a voltage of 100 to 200 V. It is suitable for charging at a current of 30 A or less for about 8 hours, and is suitable for connecting an indoor / outdoor outlet to a battery of an electric vehicle at home.

(Second Embodiment) FIG. 6 is a sectional view of a second embodiment of the present invention, showing a case where the present invention is applied to one having a nominal sectional area of 38 mm ² .

In FIG. 6, 21 is a power line core,
Similar to the core 11 of FIG. 1, the wire diameter is 0.10 to 0.26 mm
The composite stranded wire formed by twisting a plurality of strands of the above is further twisted to form a composite stranded wire, and an insulating coating is formed on the outside of the composite stranded wire.

Further, 22 is a control signal wire, and further four twisted control wires 22a, which are formed by twisting a plurality of wire strands having a diameter of 0.10 to 0.26 mm, are twisted together, and a tape 22b is attached to these. Are wound and bundled, and an insulating coating 22c is formed on the outside thereof.

The two power wire cores 21 and the two control signal wires 22 are twisted together at a twist pitch of 10 to 20 times the core diameter, and the cross section thereof is arranged into a circle by the interposition 23. And a sheath 24 is formed on the outside thereof,
Similar to the first embodiment, the sheath 24 is made of a polyvinyl chloride resin composition containing a polyester plasticizer.

By the way, as described above, in the case of a cable having a nominal cross-sectional area of more than 5.5 mm ² , the wire diameter is 0.
10 to 0.26 mm is preferable, and as described in the first embodiment, if the wire diameter is smaller than 0.10 mm, there is difficulty in manufacturing cost and the like, and the wire diameter is 0.26 m.
This is because, if it is larger than m, the hardness of the strand itself affects the flexibility of the entire cable.

Further, as described above, the twist pitch is preferably 10 to 20 times the core diameter, but this is the same as that described in the first embodiment. If it is small, the number of twists is large and the productivity is poor, and if it is larger than 20 times, each strand is linear and the flexibility of the cable is lost.

Further, a specific example of the polyvinyl chloride resin composition containing a polyester plasticizer as the sheath material is the same as that described in the first embodiment.

[0046] Therefore, according to the second embodiment, a nominal cross-sectional area a 38mm ² greater than 5.5 mm ^2, the first
As in the case of the embodiment, a charging cable for an electric vehicle having excellent flexibility can be provided at a low cost, and in particular, a current of 15
It is suitable for quick charging at about 0 A for 30 minutes to 2 hours, and is suitable for connecting an outdoor charging facility to a battery of an electric vehicle.

Although FIG. 6 shows a configuration in which the power line core 21 having a nominal cross-sectional area of 38 mm ² and the control signal line 22 are combined, the nominal cross-sectional area of other than 38 mm ² is 5.
Even if it is larger than 5 mm ² , the wire diameter is 0.10 to 0.2 so that the conductor structure shown in Table 2 is obtained.
Multiple stranded wires formed by twisting multiple 6 mm strands are further twisted to form a composite stranded wire, and a plurality of cores having a structure in which a sheath is formed on the outside of these composite stranded wires If the twisted pitch is 10 to 20 times, the same effect as the second embodiment can be obtained.

[0048]

As described above, according to the first and second aspects of the present invention, the flexibility of the rubber cabtyre cable is equal to or more than that of the conventional rubber cabtyre cable, and is cheaper than the rubber cabtyre cable. It is possible to provide a charging cable as costly as a cabtire cable, and it is suitable for an electric vehicle.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the first embodiment.

FIG. 3 is an operation explanatory diagram of the first embodiment.

FIG. 4 is an operation explanatory diagram of the first embodiment.

FIG. 5 is an operation explanatory diagram of the first embodiment.

FIG. 6 is a sectional view of a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of a usage state of a general electric vehicle charging cable.

[Explanation of symbols]

 11 wire core 11a collective twisted wire 11b composite twisted wire 11c insulating coating 12,24 sheath 21 power wire core

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Kurihara 3-11-5 Nihonbashihonmachi, Chuo-ku, Tokyo Riken Vinyl Industry Co., Ltd.

Claims (5)

[Claims] 1. A charging cable for an electric vehicle having a nominal cross-sectional area of 5.5 mm ² or less, which is used for charging a battery for driving an electric vehicle, and is twisted at a twist pitch of 10 to 20 times the core diameter. It is composed of a plurality of wire cores and a sheath formed on the outer side of each wire core, and each of the wire cores has a wire diameter of 0.10 to 0.32 mm.
A plurality of twisted strands formed by twisting a plurality of strands are further twisted together, and an insulating coating is formed on the outside thereof, and the sheath is a polyvinyl chloride resin composition containing a polyester plasticizer. A charging cable for electric vehicles. ^2. A charging cable for an electric vehicle, which has a nominal cross-sectional area of more than 5.5 mm ^{2 and} is used for charging a battery for driving an electric vehicle, and is twisted at a twist pitch of 10 to 20 times the core diameter. A plurality of wire cores and a sheath formed outside each wire core, and each wire core has a wire diameter of 0.10 to 0.26 mm.
A plurality of twisted strands formed by twisting a plurality of strands are further twisted together, and an insulating coating is formed on the outside thereof, and the sheath is a polyvinyl chloride resin composition containing a polyester plasticizer. A charging cable for electric vehicles. 3. The polyvinyl chloride resin composition is polyvinyl chloride, or a copolymer or graft copolymer mainly containing vinyl chloride, or an acrylic nitrile-butadiene copolymer rubber mainly containing vinyl chloride resin. The charging cable for an electric vehicle according to claim 1 or 2, comprising a polymer blend obtained by blending 4. The electricity according to claim 1, wherein the polyester-based plasticizer is formed by blocking the end of a polycondensation product of a polyhydric carboxylic acid and a polyhydric alcohol with a monohydric alcohol. Car charging cable. 5. A charging cable for an electric vehicle according to claim 1, wherein 70 to 120 parts by weight of the polyester plasticizer is added to 100 parts by weight of the polyvinyl chloride resin.