JP2021170467A - Flat electric wire, method for manufacturing the same, flat electric wire with terminal, and wire harness - Google Patents

Abstract

To provide a flat electric wire which can be adapted to a complicated wiring route and has excellent heat dissipation, and a method for manufacturing the same.SOLUTION: A flat electric wire 1 includes: a conductor group 1 in which a plurality of linear conductors 21 to 27 are arranged in parallel; and a first insulating resin coating part 3 coating the periphery of a conductor group 2. The electric wire has a conductor bundle part 28 that is a part where the plurality of linear conductors 21 to 27 are configured at arrangement different from parallel arrangement. The plurality of linear conductors 21 to 27 in the conductor bundle part 28 are coated with a second resin having a temperature class classified according to ISO 19642-4:2019(E) higher than that of a first resin constituting the first insulating resin coating part 3, and constitutes a second insulating resin coating part 4. The conductor bundle part 28 preferably has a cross-sectional shape that can be bent and deformed in a plurality of directions. The plurality of linear conductors 21 to 27 constituting the conductor bundle part 28 are preferably laminated and arranged in a direction orthogonal to a bending and deforming direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a flat electric wire and its manufacturing method, a flat electric wire with a terminal, and a wire harness. With flat wire and wire harness.

Vehicles such as automobiles are rapidly becoming more electrified, such as hybrid automobiles and electric vehicles, and more multifunctional or highly functional, such as autonomous driving systems and connected cars. Therefore, the wire harness used for such a vehicle needs to be able to cope with a complicated arrangement route and to have excellent heat dissipation.

For wire harnesses and the like, thin strip-shaped flat electric wires capable of increasing the surface area in order to improve heat dissipation are used. For example, Patent Document 1 discloses a flat electric wire in which a plurality of core wires are placed side by side in contact with each other and the core wires are coated with a coating material made of an insulating resin. Further, in such a flat electric wire, since the core wires are laminated in the side-by-side direction of the core wires, it may be difficult to bend the core wires in the side-by-side direction or the direction in the vicinity thereof. It is not possible to correspond to the strategy route. Therefore, in Patent Document 1, the covering material is peeled off in a required region in the length direction, bundled in a circular cross section at the central portion in the length direction of the core wire, and then an insulating resin tape or a sheet is applied to the entire exposed core wire. It is also disclosed that the flat wire is wound and coated to achieve three-dimensional bending of the flat wire. According to such a flat electric wire of Patent Document 1, from the viewpoint of bending, it is possible to correspond to a complicated arrangement route such as a vehicle.

Japanese Unexamined Patent Publication No. 2011-245988

However, as described above, the flat wire has a large surface area to improve heat dissipation. However, according to the study by the present inventors, when the core wires are bundled in a circular cross section, the surface area becomes small and a large amount of heat is generated from that portion. It was also found that the resin tape deteriorated and ignited.

The present invention has been made in view of the above circumstances, and provides a flat electric wire having excellent heat dissipation, a flat electric wire having a terminal, and a wire harness, which can cope with a complicated arrangement route. The purpose is to do.

The present inventors are flat electric wires including a conductor group in which a plurality of linear conductors are arranged in parallel and a first insulating resin coating portion that covers the periphery of the conductor group, and the flat electric wires are a plurality of linear wires. The conductor has a conductor bundle portion which is a portion composed of an arrangement different from the parallel arrangement, and a plurality of linear conductors in the conductor bundle portion are classified according to ISO 1964-4: 2019 (E). By coating the class with a second resin, which is higher than the first resin constituting the first insulating resin coating portion, to form the second insulating resin coating portion, it is possible to cope with a complicated arrangement route. Moreover, they have found that they can provide a flat electric wire having excellent heat dissipation and a method for manufacturing the flat electric wire, a flat electric wire with a terminal, and a wire harness, and have completed the present invention. Specifically, the present invention provides the following.

(1) A flat electric wire including a conductor group in which a plurality of linear conductors are arranged in parallel and a first insulating resin coating portion that covers the periphery of the conductor group.
The flat electric wire has a conductor bundle portion in which the plurality of linear conductors are formed in a different arrangement from the parallel arrangement.
The plurality of linear conductors in the conductor bundle portion have a Temperature class classified according to ISO 1964-4: 2019 (E) higher than that of the first resin constituting the first insulating resin coating portion. A flat electric wire coated with a second resin to form a second insulating resin coating.
(2) The flat electric wire according to (1) above, wherein the conductor bundle portion has a cross-sectional shape that can be bent and deformed in a plurality of directions.
(3) The flat electric wire according to (1) or (2) above, wherein the plurality of linear conductors constituting the conductor bundle portion are laminated and arranged in a direction orthogonal to a bending deformation direction.
(4) The flat electric wire according to (1), (2) or (3) above, wherein the plurality of linear conductors constituting the conductor bundle portion are laminated and arranged in a substantially circular cross-sectional shape.
(5) The arrangement of the plurality of linear conductors constituting the conductor bundle portion is in the direction in which the plurality of linear conductors constituting the conductor group are arranged in parallel when viewed from the cross section of the conductor bundle portion. The flat electric wire according to (1) or (2) above, which is a laminated arrangement in which two or more layers are stacked in orthogonal directions.
(6) The flat electric wire according to any one of (1) to (5) above, further comprising a shape-maintaining material that maintains the shape after bending and deformation around the second insulating resin coating portion.
(7) A flat electric wire with a terminal, which comprises the flat electric wire according to any one of (1) to (6) above, and a terminal portion attached to an end portion of the flat electric wire.
(8) The flat electric wire with a terminal according to (7) above, wherein the terminal portion is electrically connected to the conductor group of the flat electric wire by welding or compression.
(9) A wire harness characterized in that the flat electric wire with a terminal according to the above (7) or (8) is formed so as to be able to be assembled to a vehicle alone or in combination with another electric wire or the like.
(10) A step of manufacturing a flat electric wire including a conductor group in which a plurality of linear conductors are arranged in parallel and a first insulating resin coating portion that covers the periphery of the conductor group.
A step of peeling off the first insulating resin coating portion to expose the conductor bundle portion at any portion in the length direction of the flat electric wire.
A step of changing the shape of the exposed conductor bundle portion to a different arrangement from the parallel arrangement.
Around the shape-changed conductor bundle portion, a temperature class classified according to ISO 1964-4: 2019 (E) is higher than that of the first resin constituting the first insulating resin coating portion. A method for manufacturing a flat electric wire, comprising a step of coating with the resin of 2 to form a second insulating resin coating portion.
(11) The method for manufacturing a flat electric wire according to (10) above, further comprising a step of bending and deforming the conductor side portion coated with the second insulating resin in a direction other than the thickness direction of the flat electric wire.
(12) The flat electric wire according to claim 11, further comprising a step of coating a shape-maintaining material that maintains the shape after bending and deformation around the second insulating resin coating portion after the step of bending and deforming. Production method.

According to the present invention, it is possible to cope with a complicated arrangement route and exhibit excellent heat dissipation.

It is the schematic schematic diagram of the flat electric wire of 1st Embodiment. It is the schematic sectional drawing on the line AA of the recovering part of the flat electric wire of 1st Embodiment. It is a schematic schematic diagram of a linear conductor formed by a plurality of strands. It is a schematic schematic diagram of a linear conductor formed by a single wire. It is the schematic schematic diagram of the flat electric wire of the 2nd Embodiment. It is the schematic sectional drawing on the AA line of the recovering part of the flat electric wire of 2nd Embodiment. It is the schematic schematic diagram of the flat electric wire of the 3rd Embodiment. It is the schematic for demonstrating the manufacturing method of the flat electric wire of this embodiment. It is a schematic perspective view of the main part of the flat electric wire with a terminal for a vehicle which connected the terminal to the flat electric wire which concerns on one Embodiment of this invention. It is a schematic schematic diagram which shows the example when the flat electric wire with a terminal shown in FIG. 7 is arranged inside the vehicle as a wire harness.

Hereinafter, preferred embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments.

1. 1. Flat electric wire The flat electric wire of the present embodiment is a flat electric wire including a conductor group in which a plurality of linear conductors are arranged in parallel and an insulating resin coating portion that covers the periphery of the conductor group. Then, in this flat electric wire, a plurality of linear conductors have a conductor bundle portion which is a portion composed of an arrangement different from the parallel arrangement, and the plurality of linear conductors in the conductor bundle portion are ISO 19642-4: The conductor class classified according to 2019 (E) is coated with a second resin higher than the first resin constituting the first insulating resin coating portion to form the second insulating resin coating portion. be.

Here, the Temperature class of ISO 1964-4: 2019 (E) is divided into Class A to F, and the Temperature class is higher in the order of Class F, Class E, Class D, Class C, Class B, and Class A. It is a thing. Therefore, for example, when the second resin is Class F and the first resin is Class E, the second resin has a higher class than the first resin. The higher the Temperature class, the better the heat resistance.

The Class classification actually constitutes a flat electric wire, and the first insulating resin coating portion and the second insulating resin coating portion are evaluated for the flat electric wire, respectively.

FIG. 1 is a schematic schematic diagram of a flat electric wire according to the first embodiment. The flat electric wire 1 includes a conductor group 2 in which seven linear conductors 21 to 27 are arranged in parallel, and an insulating resin coating portion 3 that covers the periphery of the conductor group 2. The flat electric wire 1 has a conductor bundle portion 28, which is a portion in which the seven linear conductors 21 to 27 are arranged differently from the parallel arrangement. The plurality of linear conductors 21 to 27 in the conductor bundle portion 28 are classified according to ISO 1964-4: 2019 (E), and the Temperature class is a first resin constituting the first insulating resin coating portion 3. It is coated with a higher second resin to form the second insulating resin coating portion 4. In the following, the portion where the conductor bundle portion and the second insulating coating are combined may be referred to as a “recovering portion”.

FIG. 2 is a schematic cross-sectional view taken along the line AA of the recovered portion 5 of the flat electric wire of the first embodiment. FIG. 2 is a view showing the front side of the paper surface of FIG. 1 on the upper side of the paper surface.

First, consider a case where the recovered portion 5 is bent and deformed in the direction D. The plurality of linear conductors 21 to 27 constituting the conductor bundle portion 28 of the recovering portion 5 are laminated and arranged in a direction orthogonal to the bending deformation direction D (that is, in the vertical direction of the paper surface). Specifically, from the paper surface of FIG. 2, the first layer is the linear conductor 25, the second layer is the linear conductors 21 and 26, the third layer is the linear conductor 24, and the fourth layer is linear. The conductors 22, 27, and the linear conductor 23 are arranged as the fifth layer, respectively. Since the conductor bundle portion 28 is laminated and arranged in a direction orthogonal to the bending deformation direction D, the recovering portion 5 is easily bent. When seven linear conductors are arranged in a straight line in a direction parallel to the direction D in which the conductor bundle portion 28 is bent and deformed, the conductor bundle portion 28 is bent in the direction in which the seven linear conductors are arranged (so-called edge). Wise bending) is difficult.

As described above, the conductor bundle portion 28 of the recovering portion 5 has a cross-sectional shape that can be bent and deformed in a plurality of directions. As a result, when the flat electric wire 1 is applied to a wire harness, it is easy to bend in a desired direction, so that it is possible to cope with a complicated arrangement route of a vehicle.

As in this embodiment and the second embodiment described later (see also FIGS. 5 and 6), the arrangement of the plurality of linear conductors constituting the conductor bundle portion is the cross section of the conductor bundle portion (28, 28A). 2 or more layers are stacked in a direction orthogonal to the direction in which a plurality of linear conductors (21 to 27, 21A to 27A) constituting the conductor group (2, 2A) are arranged in parallel. Is preferable. By arranging the linear conductors in a laminated manner in this way, it becomes easier to bend as compared with a portion other than the recovered portion 5.

On the other hand, in the flat electric wire 1, arranging a plurality of linear conductors 21 to 27 in parallel is for increasing the surface area and improving the heat dissipation as described above. Then, the shape is changed to a cross-sectional shape different from the cross-sectional shape of the conductor portion of the conductor group 2 other than the recovered portion 5 (the circular cross-sections of the linear conductors 21 to 27 are arranged in parallel in a straight line). When the conductor group 2 is formed in the shape shown in 2, the surface area is inevitably smaller than that of the conductor group 2 other than the recovered portion 5, and it is difficult to dissipate heat. The resin may easily deteriorate or ignite.

Therefore, in the flat electric wire 1 of the present embodiment, the temperature class classified according to ISO 1964-4: 2019 (E) is higher than that of the first resin constituting the first insulating resin coating portion 3. The conductor bundle portion 28 is covered with the resin of 2. Here, the fact that the Temperature class classified according to ISO 1964-4: 2019 (E) is high means that the second resin constituting the second insulating resin coating portion 4 is the first insulating resin coating portion. It means that it is superior in heat resistance to the first resin constituting 3. By using a resin having such properties as the second resin constituting the second insulating resin coating portion 4, it is possible to prevent the resin from deteriorating and igniting due to heat generated in the conductor side portion 24. ..

The conductor side portion 28 of the flat electric wire 1 of the first embodiment has a shape closer to flat than that of the conductor side portion 28A of the flat electric wire 1A of the second embodiment described later, and has a larger surface area. Therefore, it is less likely to generate heat.

Each of the linear conductors 21 to 27 constituting the conductor group 2 can be formed of a material such as copper, a copper alloy, aluminum or an aluminum alloy. In the present embodiment, the linear conductors 21 to 27 are made of aluminum (JIS standard A1000 series. Here, JIS A1070 is used) with few impurities in an emphasis on weight reduction and flexibility.

The linear conductors 21 to 27 each have a substantially circular cross section. FIG. 3 is a schematic schematic diagram of a linear conductor 21 formed of a plurality of strands. The linear conductor 21 shown in FIG. 3 is formed of a stranded wire obtained by twisting a plurality of strands 21a. In FIG. 3, as the linear conductor 21, a stranded wire obtained by twisting 19 strands 21a is illustrated, but the number of strands 21 is not particularly limited and can be changed as appropriate. In the present embodiment, as the linear conductor 21, 19 strands 21a are twisted together to have a cross-sectional area of 0.75 sq (outer diameter 1 mm).

The linear conductors 21 to 27 may be formed of a single wire. FIG. 4 is a schematic schematic diagram of a linear conductor 21A formed of a single wire. Here, the linear conductor is advantageous in that it is formed of stranded wires in terms of flexibility and the like.

Further, each of the linear conductors 21 to 27 may be partially formed of stranded wires and the remainder may be formed of a single wire. Even if the stranded wire and the single wire are combined in this way, there is an advantage in terms of flexibility and the like.

The first insulating resin coating portion 3 covers the periphery of the conductor group 2. In the flat electric wire 1 of the present embodiment, the first insulating resin coating portion 3 may be formed of one layer or a plurality of layers. The shape of the first insulating resin coating portion 3 is not particularly limited, but as long as the cross section is a rectangular cylinder shape, the corner portions may be rounded as shown in FIGS. 1 and 2. Further, the short side and the long side may form an arc shape instead of a straight line. The material constituting the first insulating resin coating portion 3 is not particularly limited as long as it is a material having insulating properties, but is not particularly limited, but is polyvinyl chloride, polyethylene, crosslinked polyethylene, polypropylene, ethylene / ethylene tetrafluoride (ETFE). ), Polytetrafluoroethylene (PTFE) and other resin materials, natural rubber, ethylene propylene rubber, silicone rubber, fluororubber and other rubber materials, and rubber elastic resin materials (elastomers) and other flexible resin materials. It can be exemplified. In the flat electric wire 1 of the present embodiment, polyvinyl chloride is used from the viewpoint of insulation performance and the like. By forming the first insulating resin coating portion 3 with polyvinyl chloride in this way, the flexibility of the flat electric wire 1 is improved, and the handleability at the time of arrangement as a wire harness is improved.

When the first insulating resin coating portion 3 is formed of a plurality of layers, for example, a heat-resistant resin material such as polyimide or polyethylene terephthalate is provided on the inside (linear conductors 21 to 27 side), and the above-mentioned polyvinyl chloride or the like is provided on the outside. It is also possible to arrange the resin materials of the above. By arranging the heat-resistant resin material on the side in contact with the inner linear conductors 21 to 27 in this way, damage to the resin material due to heat dissipation from the linear conductors 21 to 27 can be suppressed.

The recovered portion 5 can be bent and deformed in at least one direction other than the thickness direction of the flat electric wire 1, while the portion other than the recovered portion 5, that is, the first insulating resin covering portion 3 is coated. It is preferable that the portion is also flexible. In this way, the portion covered with the first insulating resin coating portion 3 also has flexibility, so that even if it is not necessary to bend it, it may be bent or twisted to some extent together with the recovering portion 5. A predetermined shape can be easily realized, and the handleability at the time of arrangement as a wire harness can be improved.

The second insulating resin coating portion 4 covers the periphery of the conductor bundle portion 28. In the flat electric wire 1 of the present embodiment, the second heat-resistant resin coating portion 4 may be formed of one layer or a plurality of layers. However, the shape of the second heat-resistant resin coating portion 4 is not particularly limited. The second resin constituting the second heat-resistant resin coating portion 4 is classified according to ISO 1964-4: 2019 (E) more than the first resin constituting the first insulating resin coating portion 3. The resin material having a high Temperature class is not particularly limited, but a flexible resin material such as a crosslinkable flame-retardant polyethylene resin, a silicone resin, and a fluororesin-based resin can be exemplified. In the flat electric wire 1 of the present embodiment, a crosslinkable flame-retardant polyethylene resin is used from the viewpoint of insulation performance and heat resistance.

As described above, the first insulating resin coating portion 3 and the second insulating resin coating portion 4 may be formed of one layer or a plurality of layers, respectively, but the first insulating resin When at least one of the coating portion 3 and the second heat-resistant resin coating portion 4 is composed of a plurality of layers, the Temperature class of all the resins constituting the second resin coating portion 4 forms the insulating resin coating portion 3. It shall be higher than the Temperature class of any of the constituent resins.

Next, the flat electric wire of the second embodiment will be described. FIG. 5 is a schematic schematic view of the flat electric wire of the second embodiment. Further, FIG. 6 is a schematic cross-sectional view taken along the line AA of the recovered portion 5A of the flat electric wire of the second embodiment. FIG. 6 is a view showing the front side of the paper surface of FIG. 5 on the upper side of the paper surface.

The flat electric wire 1A of the second embodiment and the flat electric wire 1 of the first embodiment differ only in the arrangement of the plurality of linear conductors constituting the conductor bundle portion. Further, the reference numerals of the respective parts of the flat electric wire of the second embodiment shown in FIGS. 5 and 6 are added by adding "A" to the reference numerals of the respective parts of the flat electric wire of the first embodiment attached to FIGS. 1 and 2. If the numbers are the same, it means the same part.

In such a flat electric wire 1A, a plurality of linear conductors 21A to 27A constituting the conductor bundle portion 28A are laminated and arranged in a substantially circular cross-sectional shape. That is, the conductor bundle portion 28A of the recovering portion 5A is laminated and arranged in the directions orthogonal to all the bending directions. Specifically, from the paper surface of FIG. 5, linear conductors 23A and 25A as the first layer, linear conductors 21A, 24A and 27A as the second layer, and linear conductors 22A and 26A as the third layer, respectively. Have been placed.

Further, the flat electric wire of the third embodiment will be described. FIG. 7 is a schematic schematic diagram of the flat electric wire of the second embodiment. The flat electric wire of the third embodiment shown in FIG. 7 shows a bent shape in the recovering portion 5. More specifically, the recoating portion 5 further has a shape maintaining material 6 that maintains the shape after bending and deformation around the highly heat-resistant resin coating portion 4.

As described above, in the flat electric wire 1B of the third embodiment, by using the shape maintaining material 6, the shape after bending and deformation is maintained, the shape is prevented from returning, and the wire harness for the vehicle is stably used. Can be used as.

The shape-maintaining material 6 may be any material that does not have flexibility, and for example, various metals (aluminum and the like), alloys, ceramics, resins (polypropylene and the like) and the like can be used without particular limitation.

The dimensions such as the length of each part described above can be appropriately designed according to the application to which this is applied.

2. Method for manufacturing a flat electric wire Hereinafter, a method for manufacturing the flat electric wire 1 according to the first embodiment and the method for manufacturing the flat electric wire 1B according to a third embodiment will be described. 8 (a) to 8 (e) are schematic views for explaining the method of manufacturing the flat electric wire of the present embodiment. Specifically, the method for manufacturing these flat electric wires is a flat wire including a conductor group 2 in which a plurality of linear conductors 21 to 27 are arranged in parallel, and a first insulating resin coating portion 3 that covers the periphery of the conductor group 2. A step of manufacturing an electric wire (FIG. 8 (a)) and a step of peeling off the first insulating resin coating portion 3 to expose the conductor bundle portion 28 in any portion in the length direction of the flat electric wire (FIG. 8). 8 (b)) and the step of changing the shape of the exposed conductor bundle portion 28 to a different arrangement from the parallel arrangement (FIG. 8 (c)), and ISO 19642- around the shape-changed conductor bundle portion 28. 4: The conductor class classified according to 2019 (E) is coated with a second resin higher than the first resin constituting the first insulating resin coating portion 3, and the second insulating resin coating portion is covered with the second resin. It includes a step of forming 4.

By the above steps, the flat electric wire 1 of the first embodiment is obtained.

The method for manufacturing a flat electric wire of the present embodiment is a step of bending and deforming the conductor side portion 28 (recovered portion 5) coated with the second insulating resin in a direction other than the thickness direction of the flat electric wire 1 (a step of bending and deforming the flat wire 1 in a direction other than the thickness direction. FIG. 8 (e)) may be further included.

Further, in the method for manufacturing a flat electric wire of the present embodiment, after the step of bending and deforming the flat electric wire, a step of coating a shape-maintaining material 6 for maintaining the shape after bending and deformation around the second resin coating portion 4 (FIG. 8 (f)) may be further included.

3. 3. Flat Electric Wire with Terminal and Wire Harness FIG. 9 is a schematic perspective view schematically showing a flat electric wire 7 with a terminal for an automobile in which a terminal is connected to an end portion of the flat electric wire 1 according to the present embodiment. Further, FIG. 8 is a schematic schematic view showing a configuration example in which the flat electric wire 18 with a terminal shown in FIG. 7 is used as a wire harness in the vehicle 24.

As shown in FIG. 7, the electric wire 7 with a terminal includes a flat electric wire 1 and a terminal portion to which a terminal portion 71 is attached to an end portion of the flat electric wire 1. The terminal portion 71 is a metal terminal electrically connected to the conductor group 2 of the flat electric wire 1. The terminal portion 71 is preferably electrically connected to the conductor group 2 of the flat electric wire 1 by welding or compression. More specifically, examples of the method of connecting the terminal portion 71 and the conductor group 2 of the flat electric wire 1 include welding techniques such as ultrasonic welding, resistance welding and laser welding, and compression techniques such as crimping. Further, the connection portion between the terminal portion 71 and the collective conductor 2 of the flat electric wire 1 may be covered with a protective member 72 (heat shrinkable tube in this embodiment).

As shown in FIG. 10, the electric wire 7 with a terminal is formed as a wire harness so as to be assembleable to a vehicle, either alone or in combination with other electric wires. FIG. 10 shows an example in which the vehicle is independently attached to the vehicle. For example, it is used in various parts of a vehicle 8 such as an automobile, and is arranged in a state where bends and twists (including repeated bends and twists) are appropriately formed according to the complicated shape of the vehicle 8, and each terminal portion 71 is predetermined. It is connected to the terminal block, ECU, battery device, etc. In particular, the recovering portion 5 of the flat electric wire 1 is arranged in the electric wire bending portion 9.

As described above, the flat electric wire 10 according to the present embodiment is flexible, has high handleability and heat dissipation at the time of arrangement, and as shown in FIG. 10, for automobiles using the flat electric wire 1 with terminals. It can be particularly preferably used as a wire harness of the above. In the flat electric wire 1 of the present embodiment, since the conductor group 2 has a one-layer structure, the thickness of the conductor group 2 can be minimized, which is more useful as an in-vehicle wire harness.

The flat electric wire 1 may be used for purposes other than the in-vehicle wire harness.

The present invention is not limited to the above-described embodiment, and can be freely modified without departing from the gist of the present invention.

1,1A, 1B Flat wire or Flat wire 2,2A Conductor group 21,22,23,24,25,26,27,21A,22A,23A,24A,25A,26A,27A Linear conductor 28,28A Conductor bundle Part 3,3A First insulating resin coating part 4,4A Second insulation resin coating part 5,5A Re-covering part 6 Shape maintenance material 7 Flat wire with terminal 71 Terminal part 72 Protective member 8 Vehicle 9 Wire bending part

Claims (12)

A flat electric wire including a conductor group in which a plurality of linear conductors are arranged in parallel and a first insulating resin coating portion that covers the periphery of the conductor group.
The flat electric wire has a conductor bundle portion in which the plurality of linear conductors are formed in a different arrangement from the parallel arrangement.
The plurality of linear conductors in the conductor bundle portion have a Temperature class classified according to ISO 1964-4: 2019 (E) higher than that of the first resin constituting the first insulating resin coating portion. A flat electric wire coated with a second resin to form a second insulating resin coating. The flat electric wire according to claim 1, wherein the conductor bundle portion has a cross-sectional shape that can be bent and deformed in a plurality of directions. The flat electric wire according to claim 1 or 2, wherein the plurality of linear conductors constituting the conductor bundle portion are laminated and arranged in a direction orthogonal to a bending deformation direction. The flat electric wire according to claim 1, 2 or 3, wherein the plurality of linear conductors constituting the conductor bundle portion are laminated and arranged in a substantially circular cross-sectional shape. The arrangement of the plurality of linear conductors constituting the conductor bundle portion is a direction orthogonal to the direction in which the plurality of linear conductors constituting the conductor group are arranged in parallel when viewed in a cross section of the conductor bundle portion. The flat electric wire according to claim 1 or 2, which is a laminated arrangement in which two or more layers are stacked. The flat electric wire according to any one of claims 1 to 5, further comprising a shape-maintaining material that maintains the shape after bending and deformation around the second insulating resin coating portion. A flat electric wire with a terminal, comprising the flat electric wire according to any one of claims 1 to 6 and a terminal portion attached to an end portion of the flat electric wire. The flat electric wire with a terminal according to claim 7, wherein the terminal portion is electrically connected to the conductor group of the flat electric wire by welding or compression. A wire harness in which the flat electric wire with a terminal according to claim 7 or 8 is formed so as to be able to be assembled to a vehicle alone or in combination with other electric wires. A step of manufacturing a flat electric wire including a conductor group in which a plurality of linear conductors are arranged in parallel and a first insulating resin coating portion that covers the periphery of the conductor group.
A step of peeling off the first insulating resin coating portion to expose the conductor bundle portion at any portion in the length direction of the flat electric wire.
A step of changing the shape of the exposed conductor bundle portion to a different arrangement from the parallel arrangement.
Around the shape-changed conductor bundle portion, a temperature class classified according to ISO 1964-4: 2019 (E) is higher than that of the first resin constituting the first insulating resin coating portion. A method for manufacturing a flat electric wire, comprising a step of coating with the resin of 2 to form a second insulating resin coating portion. The method for manufacturing a flat electric wire according to claim 10, further comprising a step of bending and deforming the conductor side portion coated with the second insulating resin in a direction other than the thickness direction of the flat electric wire. The method for manufacturing a flat electric wire according to claim 11, further comprising a step of coating a shape-maintaining material that maintains the shape after bending and deformation around the second insulating resin coating portion after the step of bending and deforming.

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