Electric wire having terminal and method for manufacturing same

Abstract

An electric wire (1) having a terminal includes: an electric wire (10) in which a single wire (16) is arranged at an end of a conductor (11) and the single wire (16) is continuously and integrally connected to a plurality of element wires (15); a coating material (20) that spans a portion of the single wire (16) and a portion of the insulating sheath (12) so as to cover the entire surface of the bundle of the plurality of element wires (15) of the conductor exposed portion (13); and a terminal (30) including a conductor connection portion (31) connected to the single wire (16).

Description

Technical Field

[0001] The present invention relates to an electric wire with a terminal and a method for manufacturing the electric wire with a terminal. Background Art

[0002] There is a conventionally known electric wire with a terminal, which has an electric wire and a terminal, the electric wire having a conductor, the conductor having a plurality of element wires, and the terminal being connected to the conductor. If such an electric wire with a terminal is used in a place where water may enter, such as an engine compartment of an automobile, water may penetrate between the element wires, and the conductor may be corroded. Therefore, there is known an electric wire with a terminal, in which a plurality of element wires are covered with a heat shrink tube to prevent water from penetrating between the element wires of the conductor.

[0003] Patent document 1 discloses a waterproof structure of a ground terminal for automobiles. In this structure, a core wire is compressed and crimped by a core wire crimping barrel, and an insulating sheath of an electric wire is compressed and crimped by an insulating sheath crimping barrel. One end side of a heat shrink tube completely covers the core wire compressed and crimped by the core wire crimping barrel, and the other end side is in close contact with the electric wire. An adhesive is applied to the inner peripheral surface of the heat shrink tube, and the adhesive adheres to the ground terminal and the electric wire to eliminate the gap.

[0004] Reference List

[0005] Patent Literature

[0006] [Patent Document 1] JP 2000-285983 A Summary of the invention

[0007] According to Patent Document 1, the adhesive applied to the inner peripheral surface of the heat shrink tube fills the gaps between the core wires to prevent water from penetrating between the plurality of element wires. However, due to the difference in diameter of each element wire and the diameter of each conductor, the adhesive may not be able to fully penetrate into the center portion of the conductor. In particular, when the electric wire is used in a bent state with gaps left between the conductors, the gaps between the core wires become larger, and there is a risk that water easily penetrates into the end of the electric wire.

[0008] The present invention is designed in view of the problems of the prior art. An object of the present invention is to provide an electric wire with a terminal and a method for manufacturing the electric wire with a terminal that can prevent water from entering between element wires of the conductor.

[0009] According to an aspect of the present invention, an electric wire with a terminal includes: an electric wire including a conductor and an insulating sheath covering the outer periphery of the conductor, the conductor including a plurality of element wires, and the electric wire including a conductor exposed portion and a conductor covered portion, in which the conductor is exposed from the insulating sheath, and in which the conductor is covered by the insulating sheath, the conductor exposed portion includes a single wire, the single wire is arranged at an end of the conductor, and the single wire is continuously and integrally connected to the plurality of element wires; a covering material spanning a portion of the single wire and a portion of the insulating sheath to cover the entire surface of a bundle of the plurality of element wires of the conductor exposed portion; and a terminal including a conductor connecting portion and a terminal connecting portion, the conductor connecting portion being connected to the single wire and the terminal connecting portion being configured to be connected to a mating terminal.

[0010] According to another aspect of the present invention, a method for manufacturing an electric wire with a terminal includes: a step of covering the entire surface of a bundle of multiple elements of a conductor exposure portion in the electric wire with a covering material, the covering material spanning a portion of a single wire and a portion of an insulating sheath, the electric wire including a conductor and an insulating sheath covering the outer circumference of the conductor, the conductor including a plurality of element wires, and the electric wire including a conductor exposure portion and a conductor covering portion, in which the conductor is exposed from the insulating sheath, and in which the conductor is covered by the insulating sheath, the conductor exposure portion including a single wire, the single wire being arranged at an end of the conductor, and the single wire being continuously and integrally connected to the plurality of element wires; and a step of connecting the single wire to a terminal, the terminal including a terminal connecting portion configured to be connected to a mating terminal.

[0011] According to the present invention, it is possible to provide an electric wire with a terminal capable of preventing water from entering between element wires of a conductor and a method of manufacturing the electric wire with a terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a side view schematically showing an example of an electric wire with a terminal according to the present embodiment.

[0013] Figure 2 is a cross-sectional view schematically showing an example of the electric wire with terminal according to the present embodiment.

[0014] Figure 3 is a cross-sectional view schematically showing an example of an electric wire with a terminal having a housing.

[0015] Figure 4 is a schematic side view showing an example of a state in which the insulating sheath of the electric wire is stripped.

[0016] Figure 5is a side view schematically showing an example of a single wire formed in a conductor exposed portion of an electric wire.

[0017] Figure 6 is a side view schematically showing an example of a state in which the electric wires are covered with a covering material.

[0018] Figure 7 is a front view showing an example of forming a single wire from a plurality of element wires using an ultrasonic welder.

[0019] Figure 8 : is a perspective view schematically showing an example of a state before the terminal according to the present embodiment is assembled.

[0020] Fig. 9 : is a perspective view schematically showing an example of a state where the terminal according to the present embodiment is assembled.

[0021] Reference Mark List

[0022] 1 Wire with terminal

[0023] 10 Wires

[0024] 11 Conductor

[0025] 12 Insulation sheath

[0026] 13 Conductor exposed part

[0027] 14 Conductor coating

[0028] 15 Yuan Line

[0029] 16 Single Line

[0030] 20 Covering materials

[0031] 30 terminals

[0032] 31 Conductor connection part

[0033] 32-terminal connection part DETAILED DESCRIPTION

[0034] The following will describe in detail an electric wire with a terminal, an electric wire with a connector, and a method of manufacturing an electric wire with a terminal according to the present embodiment with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are exaggerated for ease of description and may differ from the actual ratios.

[0035] [Wire with terminal]

[0036] First, the electric wire with terminal 1 according to the present embodiment will be described. Figure 1 : is a side view schematically showing an example of the electric wire with terminal 1 according to the present embodiment. Figure 21 is a cross-sectional view schematically showing an example of the electric wire 1 with a terminal according to the present embodiment. Figure 1 and Figure 2 As shown, the electric wire with terminal 1 according to the present embodiment includes an electric wire 10 , a coating material 20 , and a terminal 30 .

[0037] Figure 5 is a side view schematically showing an example of the electric wire 10. Figure 5 As shown, the electric wire 10 includes a conductor 11 and an insulating sheath 12 covering the outer circumference of the conductor 11 .

[0038] The conductor 11 includes a plurality of element wires 15 and a single wire 16. The plurality of element wires 15 may be an aggregated stranded wire formed by bundling a plurality of element wires 15. In addition, the conductor 11 may be composed of only one aggregated stranded wire, may be a composite stranded wire formed by bundling a plurality of aggregated stranded wires, or may be a round rod conductor in the electric wire 10. As described later, the single wire 16 is a single conductor formed of a plurality of element wires 15 by, for example, welding.

[0039] A highly conductive metal can be used as the material of the conductor 11. The material of the conductor 11 may be, for example, copper, aluminum, or an alloy thereof.

[0040] As the material of the insulating sheath 12, a thermoplastic resin capable of ensuring electrical insulation can be used. The material of the insulating sheath 12 may include, for example, at least one of an olefin resin and polyvinyl chloride. The olefin resin may include, for example, at least one resin selected from the group consisting of polyethylene (PE), polypropylene (PP), ethylene copolymers, and propylene copolymers.

[0041] The electric wire 10 has a conductor exposed portion 13 in which the insulating sheath 12 is stripped and the conductor 11 is exposed from the insulating sheath 12. Furthermore, the electric wire 10 has a conductor covered portion 14 in which the conductor 11 is covered by the insulating sheath 12. The conductor exposed portion 13 is arranged at an end portion of the conductor 11.

[0042] The conductor exposed portion 13 includes a plurality of element wires 15 and a single wire 16. However, the conductor exposed portion 13 may not include a plurality of element wires 15, and the entire conductor exposed portion 13 may be a single wire 16. The conductor covered portion 14 includes a plurality of element wires 15, but does not include a single wire 16.

[0043] The single wire 16 is arranged at the end of the conductor 11. Since the single wire 16 is arranged at the end of the conductor 11, water can be prevented from infiltrating into the conductor 11 from the end of the conductor 11.

[0044] The single wire 16 is connected to the plurality of element wires 15 continuously and integrally. Specifically, the single wire 16 is connected to each of the plurality of element wires 15 continuously and integrally. In addition, the diameter of the single wire 16 is larger than the diameter of each element wire 15. There is a gap between each element wire 15, and the liquid penetrates through the gap. At the same time, the number of paths for the liquid to penetrate in the axial direction of the conductor 11 becomes smaller for the single wire 16 than for the plurality of element wires 15. Although the single wire 16 may not have a gap for liquid to penetrate, the single wire 16 may also include a small amount of gaps as long as the gaps are connected to each other without communicating with the space outside the single wire 16.

[0045] The coating material 20 spans a portion of the single wire 16 and a portion of the insulating sheath 12 to cover the entire surface of the bundle of the plurality of element wires 15 of the conductor exposed portion 13. Since the coating material 20 covers the entire circumference of the plurality of element wires 15, it is possible to prevent liquid from penetrating from the outer surface of the plurality of element wires 15. Specifically, the coating material 20 may be a tube. One end of the coating material 20 is connected to the entire circumferential surface of the edge of the single wire 16, and the other end of the coating material 20 is connected to the entire circumferential surface of the insulating sheath 12.

[0046] An adhesive may be arranged on the inner peripheral surface of the coating material 20. The type of adhesive is not particularly limited, and the adhesive may be, for example, a hot melt adhesive. By allowing the adhesive to penetrate between the element wires 15, it is possible to further prevent liquid from infiltrating between the element wires 15. For the adhesive, a material that bonds the conductor 11 and the insulating sheath 12 can be used. Instead of a tube, the coating material 20 may be a substance such as a tape, a substance such as a sheet, or a substance obtained by stacking and hardening a thermosetting resin or a thermoplastic resin.

[0047] The coating material 20 may include a resin because the resin has high electrical insulation and is easy to handle. Since the resin can be easily molded by heating, the coating material 20 can include a thermoplastic resin. The thermoplastic resin may include, for example, at least one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, vinyl chloride resin, ABS resin, polycarbonate, acrylic resin, polybutylene terephthalate, polyacetal, polyamide, aromatic polyamide, polyphenylene sulfide, liquid crystal polymer, polyvinylidene chloride and polyvinylidene fluoride.

[0048] The terminal 30 includes a conductor connection portion 31 and a terminal connection portion 32. The conductor connection portion 31 is arranged at one end of the terminal 30, and the terminal connection portion 32 is arranged at the other end of the terminal 30.

[0049] The conductor connection portion 31 is connected to the single wire 16. The conductor connection portion 31 is configured to be mechanically connected and electrically connected to the conductor 11 by being connected to the conductor exposed portion 13 of the electric wire 10. The conductor connection portion 31 covers the conductor exposed portion 13 to surround the circumference of the single wire 16. The single wire 16 and the conductor connection portion 31 may be connected by welding such as ultrasonic welding and thermal welding, or may be connected by crimping. However, if the single wire 16 and the conductor connection portion 31 are connected by crimping such as pressing, the contact portion between the conductor connection portion 31 and the single wire 16 may open in a trumpet shape. Therefore, it is desirable that the single wire 16 and the conductor connection portion 31 are connected by welding.

[0050] The terminal connection portion 32 is configured to be connected to a mating terminal (not shown). Since the terminal connection portion 32 is connected to the terminal connection portion of the mating terminal, the terminal 30 is mechanically and electrically connected to the mating terminal. When connected to the conductor 11, the terminal connection portion 32 has a cylindrical space therein, and the mating terminal (not shown) can be inserted into the cylindrical space.

[0051] Although an example of the terminal 30 has been described, in this embodiment, the conductor 11 has a single wire 16, and a bundle of multiple element wires 15 is covered by the coating material 20 to prevent liquid from entering. Therefore, the specific shape of the terminal 30 is not particularly limited, and a terminal of any shape can be used.

[0052] The terminal 30 is formed of a conductive material. The material forming the terminal 30 may include, for example, at least one metal selected from the group consisting of copper, aluminum, iron, and magnesium. The surface of the terminal 30 may be plated or unplated.

[0053] As described above, the electric wire 1 with a terminal according to the present embodiment includes an electric wire 10, a coating material 20, and a terminal 30. The electric wire 10 includes a conductor 11 having a plurality of element wires 15 and an insulating sheath 12 covering the outer periphery of the conductor 11. The electric wire 10 has a conductor exposed portion 13 and a conductor coated portion 14, in which the conductor 11 is exposed from the insulating sheath 12 in the conductor exposed portion 13, and in which the conductor 11 is covered by the insulating sheath 12 in the conductor coated portion 14. The conductor exposed portion 13 includes a single wire 16, which is arranged at the end of the conductor 11, and the single wire 16 is continuously and integrally connected to the plurality of element wires 15. The coating material 20 spans a portion of the single wire 16 and a portion of the insulating sheath 12 to cover the entire surface of the bundle of the plurality of element wires 15 of the conductor exposed portion 13. The terminal 30 includes a conductor connecting portion 31 connected to the single wire 16 and a terminal connecting portion 32 configured to be connected to a mating terminal.

[0054] In the electric wire with terminal 1 according to the present embodiment, the single wire 16 is arranged at the end of the conductor 11. The coating material 20 spans a portion of the single wire 16 and a portion of the insulating sheath 12 to cover the entire surface of the bundle of the plurality of element wires 15 of the conductor exposed portion 13. With such a configuration, liquid is blocked by the coating material 20, and the liquid can be prevented from contacting the plurality of element wires 15.

[0055] Therefore, according to the electric wire with terminal 1, it is possible to prevent water from entering between the element wires 15 of the conductor.

[0056] Furthermore, according to the electric wire with terminal 1 of the present embodiment, there is no need to provide a mechanism for sealing the plurality of element wires 15 using a rubber member or the like. Therefore, it is possible to contribute to shortening the lead time and reducing the size and weight of the product.

[0057] [Wire with connector]

[0058] Next, the electric wire 100 with a connector according to the present embodiment will be described. Figure 3 As shown, the electric wire 100 with a connector according to the present embodiment includes an electric wire 1 with a terminal and a housing 40 for accommodating the electric wire 1 with a terminal. Since the housing 40 accommodates the electric wire 1 with a terminal, the electric wire 10 and the terminal 30 can be protected, and the electric wire 1 with a terminal can be easily handled. The housing 40 may include a terminal holding portion 41, an electric wire holding portion 42, and a holding portion 43. The terminal holding portion 41 surrounds the entire circumference of the terminal 30 and holds the terminal 30. The electric wire holding portion 42 holds the electric wire 10 so that the electric wire 10 does not move relative to the terminal 30. The holding portion 43 is arranged radially outside the terminal holding portion 41 and the electric wire holding portion 42. Since the holding portion 43 is arranged radially outside, the electric wire 1 with a terminal can be easily clamped and handled.

[0059] The housing 40 may include a resin because the resin has high electrical insulation and is easy to handle. Since the resin can be easily formed by heating, the housing may include a thermoplastic resin. The thermoplastic resin includes, for example, at least one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, vinyl chloride resin, ABS resin, polycarbonate, acrylic resin, polybutylene terephthalate, polyacetal, polyamide, aromatic polyamide, polyphenylene sulfide, liquid crystal polymer, polyvinylidene chloride and polyvinylidene fluoride.

[0060] [Method for manufacturing electric wire with terminal]

[0061] Next, a method of manufacturing the electric wire with terminal 1 according to the present embodiment will be described. The method of manufacturing the electric wire with terminal 1 according to the present embodiment includes a conductor exposing step, a single wire forming step, a covering step, and a connecting step.

[0062] Figure 4 1 is a schematic side view showing an example of a state in which the insulating sheath 12 of the electric wire 10 is stripped by performing the conductor exposing step. Figure 5 1 is a side view schematically showing an example of the single wire 16 which is formed in the conductor exposed portion 13 of the electric wire 10 and is formed by performing the single wire forming step. Figure 6 1 is a side view schematically showing an example of a state in which the electric wire 10 is covered with the covering material 20 by performing the covering step. Figure 1 1 is a side view schematically showing an example of the electric wire with terminal 1 according to the present embodiment formed by performing the connecting steps. Each step will be described in detail below.

[0063] (Conductor exposure step)

[0064] In the conductor exposing step, first, the electric wire 10 is prepared. The electric wire 10 includes a conductor 11 and an insulating sheath 12 covering the outer periphery of the conductor 11, and the conductor 11 includes a plurality of element wires 15. Next, a portion of the insulating sheath 12 of the electric wire 10 is stripped. As a result, as shown in FIG. Figure 4 As shown, the electric wire 10 has a conductor exposed portion 13 in which the conductor 11 is exposed from the insulating sheath 12 , and a conductor covered portion 14 in which the conductor 11 is covered by the insulating sheath 12 .

[0065] (Single line formation step)

[0066] In the single wire forming step, a single wire 16 is formed from a plurality of element wires 15 at the end of the conductor exposed portion 13. As a result, Figure 5 As shown, an electric wire 10 is formed in which a conductor exposed portion 13 has a single wire 16, the single wire 16 is arranged at an end of a conductor 11, and the single wire 16 is continuously and integrally connected to a plurality of element wires 15. Although the single wire 16 is formed of a plurality of element wires 15 in this embodiment, an electric wire having a single wire may be manufactured by connecting a twisted wire including a plurality of element wires with a single wire.

[0067] There is no particular limitation on the method of forming the single wire 16, and the single wire 16 can be formed from a plurality of element wires 15 by ultrasonic welding, thermal welding, or pressing. The single wire 16 is formed by integrating a plurality of element wires 15 by melting or atomically diffusing the surfaces of the individual element wires 15 by ultrasonic welding, thermal welding, or pressing. Thus, if ultrasonic welding is adopted, the single wire 16 can be easily formed from a plurality of element wires 15 in a short time. Therefore, it is preferable to form the single wire 16 by ultrasonically welding a plurality of element wires 15.

[0068] Ultrasonic welding can be performed using a known ultrasonic welder. The ultrasonic welder may include, for example, a horn and an anvil. The horn transmits vibration energy to the plurality of element wires 15. The anvil is a receiver of the horn and is arranged to face the horn. By transmitting vibration energy to the plurality of element wires 15 via the horn, while the plurality of element wires 15 are sandwiched between the horn and the anvil and pressure is applied thereto, friction heat is generated at the contact surface between the individual element wires 15, and the individual element wires 15 can be welded due to the friction heat.

[0069] Will refer to Figure 7 A specific example of an ultrasonic welder is described. Figure 7 As shown, the ultrasonic welder 50 according to the present embodiment includes a horn 51, a fixed side plate 52, a movable slide core 53, and an anvil 54. The horn 51 is configured to perform ultrasonic vibrations by an ultrasonic oscillator.

[0070] The anvil 54 is arranged above the welding head 51 and the side plate 52, and the anvil 54 is configured to be movable in a direction toward or away from the welding head 51 by moving the anvil 54 up and down. Figure 7 The anvil 54 is along Figure 7 Move in the direction indicated by the arrow B and press the multiple element wires 15 in this direction.

[0071] The side plate 52 faces the slide core 53 and is arranged on one side of the horn 51 in a direction perpendicular to the facing direction of the horn 51 and the anvil 54. The slide core 53 is arranged on the upper surface of the horn 51 and at a position facing the side plate 52, and is configured to be movable in a direction toward or away from the side plate 52. Figure 7 In the embodiment, the sliding core 53 is Figure 7 The ultrasonic welder 50 moves in the direction indicated by the arrow A in the middle and presses the plurality of element wires 15 in the direction. The ultrasonic welder 50 can perform ultrasonic welding by vibrating the plurality of element wires 15 arranged in a rectangular space in a cross-sectional view defined by the horn 51, the side plate 52, the slide core 53 and the anvil 54 via the horn 51.

[0072] By adjusting the shape of the space where the plurality of element wires 15 are sandwiched by the horn and anvil of the ultrasonic welder, a single wire 16 having a desired shape can be formed. Figure 7 The single wire 16 shown has a rectangular cross section, but it is also possible to form a single wire 16 with a circular cross section.

[0073] (Override Steps)

[0074] In the covering step, the electric wire 10 is covered with the covering material 20. Specifically, the covering material 20 spans a portion of the single wire 16 and a portion of the insulating sheath 12 to cover the entire surface of the bundle of the plurality of element wires 15 of the conductor exposed portion 13 with the covering material 20. The covering material 20 may be a heat shrink tube. As described above, an adhesive may be applied to the inner peripheral surface of the heat shrink tube. By covering a portion of the single wire 16 and a portion of the insulating sheath 12 with the heat shrink tube and applying heat thereto, the heat shrink tube shrinks, and the entire surface of the bundle of the plurality of element wires 15 can be covered with the heat shrink tube.

[0075] (Connection steps)

[0076] In the connecting step, the single wire 16 is connected to the terminal 30 including the terminal connecting portion 32 configured to be connected to a mating terminal. Figure 8 1 is a perspective view schematically showing an example of a state before assembly of the terminal 30 according to the present embodiment. Fig. 9 1 is a perspective view schematically showing an example of a state where the terminal 30 according to the present embodiment is assembled.

[0077] By Figure 8 The flat plate component shown is rolled as Fig. 9 The terminal 30 is formed into a cylindrical shape, and the component is connected to the single wire 16, and a conductor connection portion 31 connected to the single wire 16 is formed at one end of the terminal 30. In addition, by rolling the flat component into a cylindrical shape and connecting the component to the single wire 16, a terminal connection portion 32 configured to be connected to a mating terminal is formed at the other end of the terminal 30. This forms a terminal 30 including a conductor connection portion 31 and a terminal connection portion 32. The single wire 16 and the conductor connection portion 31 can be connected by welding, such as ultrasonic welding and heat welding, or can be connected by crimping. However, if the single wire 16 and the conductor connection portion 31 are connected by crimping such as pressing, the contact portion between the conductor connection portion 31 and the single wire 16 may open in a trumpet shape. Therefore, it is desirable that the single wire 16 and the conductor connection portion 31 are connected by welding.

[0078] As described above, the method for manufacturing the electric wire 1 with a terminal according to the present embodiment includes a covering step and a connecting step. The electric wire 10 includes a conductor 11 having a plurality of element wires 15 and an insulating sheath 12 covering the outer periphery of the conductor 11. The electric wire 10 has a conductor exposed portion 13 and a conductor covered portion 14, in which the conductor 11 is exposed from the insulating sheath 12 in the conductor exposed portion 13 and the conductor covered portion 14 is covered by the insulating sheath 12. The conductor exposed portion 13 includes a single wire 16, which is arranged at the end of the conductor 11, and the single wire 16 is continuously and integrally connected to the plurality of element wires 15. In the covering step, the covering material 20 spans a portion of the single wire 16 and a portion of the insulating sheath 12 to cover the entire surface of the bundle of the plurality of element wires 15 of the conductor exposed portion 13 with the covering material 20. In the connecting step, the single wire 16 is connected to the terminal 30 including the terminal connecting portion 32, and the terminal connecting portion 32 is configured to be connected to the mating terminal. According to the manufacturing method of this embodiment, the electric wire 1 having the above-mentioned terminal can be manufactured.

[0079] The entire contents of Japanese patent application No. 2022-166071 filed on October 17, 2022 are incorporated herein by reference.

[0080] Although the present embodiment has been described above, the present embodiment is not limited to the above description, and various modifications can be made within the scope of the gist of the present embodiment.

Claims

1. An electric wire with a terminal, comprising: An electric wire comprising a conductor and an insulating sheath covering the outer periphery of the conductor, the conductor comprising a plurality of element wires, and the electric wire comprising a conductor exposed portion where the conductor is exposed from the insulating sheath and a conductor covered portion where the conductor is covered by the insulating sheath, the conductor exposed portion comprising a single wire, the single wire being arranged at an end portion of the conductor and the single wire being continuously and integrally connected to the plurality of element wires; a covering material that spans a portion of the single wire and a portion of the insulating sheath to cover the entire surface of the bundle of the plurality of element wires of the conductor exposed portion; as well as A terminal includes a conductor connection portion connected to the single wire and a terminal connection portion configured to be connected to a mating terminal.

2. The electric wire with a terminal according to claim 1, wherein An adhesive is provided on the inner peripheral surface of the covering material.

3. A method for manufacturing an electric wire having a terminal, comprising: a step of covering the entire surface of a bundle of a plurality of elements of a conductor exposed portion with a covering material in an electric wire, the electric wire comprising a conductor and an insulating sheath covering the outer periphery of the conductor, the conductor comprising the plurality of element wires, and the electric wire comprising a conductor exposed portion where the conductor is exposed from the insulating sheath and a conductor covered portion where the conductor is covered by the insulating sheath, the conductor exposed portion comprising a single wire, the single wire being arranged at an end of the conductor and the single wire being continuously and integrally connected to the plurality of element wires, the covering material spanning a portion of the single wire and a portion of the insulating sheath; as well as The step of connecting the single wire to a terminal including a terminal connection portion configured for connection to a mating terminal.

4. The method for manufacturing an electric wire with a terminal according to claim 3, wherein: The single wire is formed by welding the plurality of element wires using ultrasonic welding.

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