Conductor connection structure

Abstract

A conductor connection structure (1) is provided with: a first conductor (2) provided with a conductor part (20) having a plate-shaped end part; and a second conductor (3) provided with a conductor part (30) having a plate-shaped end part. A width dimension and a thickness dimension at an end portion of the conductor portion of the first conductor are substantially the same as a width dimension and a thickness dimension at an end portion of the conductor portion of the second conductor, respectively. The end face of the end portion of the conductor portion of the first conductor and the end face of the end portion of the conductor portion of the second conductor are joined by a joining portion (4), and the end portion of the conductor portion of the first conductor and the end portion of the conductor portion of the second conductor are not joined in a state of being stacked on each other in the thickness direction. In a plan view of the first conductor and the second conductor, the wire length (W1) of the entire joining part is 1.7 times or more of the shorter one of the width dimension (W2) at the end of the conductor part of the first conductor and the width dimension (W3) at the end of the conductor part of the second conductor.

Description

Technical Field

[0001] This invention relates to conductor connection structures. Background Technology

[0002] Automobiles contain a variety of electronic devices, and wiring harnesses are installed to transmit power and control signals to these devices. A wiring harness has multiple wires and connectors, which are used to connect to electronic devices and other wiring harnesses by mating with the connectors of those devices and other wiring harnesses.

[0003] The terminal wires (conductor wires) that make up such wire harnesses generally have wires and terminal fittings (conductors) installed at the ends of the wires (see Japanese Patent Application Publication No. 2018-190617).

[0004] Japanese Patent Application Publication No. 2018-190617 discloses a terminald wire comprising: a wire having a conductor portion made of a material primarily composed of a first metal covered with an insulating material; and a terminal having a material primarily composed of a second metal different from the first metal and connected to the conductor portion exposed at one end of the wire. In this terminald wire, an alloy layer comprising the first and second metals is formed across the entire outer periphery of the contact portion between the conductor portion and the terminal. Specifically, with the conductor portion comprising multiple wires butted together with the terminal, the contact portion between the conductor portion and the terminal is joined using a laser welding machine. The resulting joint between the conductor portion and the terminal forms an alloy layer, and the conductor portion and the terminal are in a conductive state and firmly joined. Summary of the Invention

[0005] In Japanese Patent Application Publication No. 2018-190617, a plate-shaped terminal and a generally rectangular parallelepiped conductor are joined in a butt joint state. Therefore, in order to ensure conductivity between the terminal and the conductor, the butt joint needs to be completely melted. However, when the plate-shaped terminal and the conductor of the wire are made of different metals, the conductivity of each metal is different, so even if the butt joint is completely melted, the conductivity between the terminal and the conductor of the wire may become insufficient.

[0006] This invention was made in view of the problems inherent in the prior art. The object of this invention is to provide a conductor connection structure that improves the conductivity of the joint even when two dissimilar conductors are joined.

[0007] The conductor connection structure according to the present invention includes: a first conductor having a plate-shaped conductor portion at one end; and a second conductor having a plate-shaped conductor portion at one end. The width and thickness dimensions at the ends of the conductor portions of the first conductor and the second conductor are approximately the same. The end faces of the ends of the conductor portions of the first conductor and the second conductor are joined by a joint, but the ends of the conductor portions of the first conductor and the second conductor are not joined while being stacked on top of each other in the thickness direction. Viewed from above, the overall length of the joint is at least 1.7 times the shorter of the width dimensions at the ends of the conductor portions of the first and second conductors.

[0008] According to the present invention, a conductor connection structure can be provided that improves the conductivity of the joint even when two different conductors are joined. Attached Figure Description

[0009] Figure 1 This is a perspective view that schematically illustrates an example of a conductor connection structure according to this embodiment.

[0010] Figure 2 This is a top view that schematically illustrates other examples of conductor connection structures involved in this embodiment.

[0011] Figure 3 This is a top view that schematically illustrates other examples of conductor connection structures involved in this embodiment.

[0012] Figure 4 This is a perspective view that schematically illustrates other examples of conductor connection structures involved in this embodiment.

[0013] Figure 5A , Figure 5B as well as Figure 5C This is a schematic diagram illustrating the manufacturing method of the conductor connection structure involved in this embodiment.

[0014] Figure 6A and Figure 6B This is a schematic perspective view used to explain why the overall line length of the joint is more than 1.7 times the shorter of the width dimension at the end of the conductor portion of the first conductor and the width dimension at the end of the conductor portion of the second conductor. Detailed Implementation

[0015] The conductor connection structure according to this embodiment will now be described in detail using the accompanying drawings. Furthermore, the dimensions in the drawings are sometimes exaggerated for ease of explanation and differ from the actual dimensions.

[0016] like Figure 1 As shown, the conductor connection structure 1 according to this embodiment includes: a first conductor 2, which has a conductor portion 20 with a plate-shaped end; and a second conductor 3, which has a conductor portion 30 with a plate-shaped end. Furthermore, in this specification and the accompanying drawings, arrow Y indicates the direction in which the first conductor 2 and the second conductor 3 are arranged, arrow Z indicates the direction orthogonal to arrow Y (vertical direction), and arrow X indicates the direction orthogonal to both arrow Y and arrow Z (left-right direction).

[0017] The first conductor 2 includes a conductor portion 20 made of a conductive metal and an insulating covering layer 21 surrounding the conductor portion 20. The conductor portion 20 is a plate-shaped component at least at its end. The insulating covering layer 21 is formed of a resin material that is flexible and electrically insulating. Furthermore, the insulating covering layer 21 is removed from one end of the first conductor 2, exposing the end of the conductor portion 20. As such a first conductor 2, a busbar or terminal can be used, for example.

[0018] The second conductor 3 also includes a conductor portion 30 made of a conductive metal and an insulating covering layer 31 surrounding the conductor portion 30. The conductor portion 30 is a plate-shaped component at least at its end. The insulating covering layer 31 is formed of a resin material that is flexible and electrically insulating. Furthermore, one end of the second conductor 3 is the end where the insulating covering layer 31 is removed, exposing the conductor portion 30. As such a second conductor 3, for example, a busbar or a terminal can be used.

[0019] The conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 are formed by processing a sheet material made of conductive metal. Furthermore, the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be made of a single layer of metal sheet, or they can be made of a laminated plate composed of multiple thin metal sheets.

[0020] The conductive metal material constituting the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 is not particularly limited; for example, copper, copper alloys, aluminum, or aluminum alloys can be used. Specifically, both the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be made of aluminum or aluminum alloys. Alternatively, both the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be made of copper or copper alloys. Furthermore, one of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be made of copper or copper alloys, and the other of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be made of aluminum or aluminum alloys.

[0021] The thickness of the conductor portion 20 of the first conductor 2 along the Z direction is approximately the same as the thickness of the conductor portion 30 of the second conductor 3 along the Z direction. Preferably, the thickness of the conductor portion 20 of the first conductor 2 is within ±30% of the thickness of the conductor portion 30 of the second conductor 3. Furthermore, the thickness of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 are not particularly limited, and can be, for example, set to 3mm to 6mm.

[0022] The width dimension of the conductor portion 20 of the first conductor 2 along the X direction is approximately the same as the width dimension of the conductor portion 30 of the second conductor 3 along the X direction. Preferably, the width dimension of the conductor portion 20 of the first conductor 2 is within ±30% relative to the width dimension of the conductor portion 30 of the second conductor 3.

[0023] In addition, leaf springs, protrusions, through holes, etc., may be formed on the first conductor 2 and the second conductor 3 to prevent them from falling off when inserted into connectors, etc.

[0024] The conductor portion 20 of the first conductor 2 has a protrusion 201 that protrudes toward the conductor portion 30 of the second conductor 3. Furthermore, the protrusion 201 is approximately triangular in shape when viewed from above. The conductor portion 30 of the second conductor 3 has a recess 301 that follows the shape of the protrusion 201. Furthermore, the recess 301 is approximately triangular in shape when viewed from above. Therefore, the protrusion 201 in the conductor portion 20 of the first conductor 2 has a structure that engages with the recess 301 in the conductor portion 30 of the second conductor 3.

[0025] Then, with the end face of the protrusion 201 in the conductor portion 20 of the first conductor 2 in contact with the end face of the recess 301 in the conductor portion 30 of the second conductor 3, the interface between the protrusion 201 and the recess 301 is joined, thereby forming the joint portion 4. The joint portion 4 is formed from the surface of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 in the thickness direction, i.e., the Z direction, to the back surface. In addition, the joint portion 4 is formed from one end of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 in the width direction, i.e., the X direction, to the other end.

[0026] Here, viewed from above, the overall line length W1 of the joint 4 is at least 1.7 times the shorter of the width dimensions W2 at the end of the conductor portion 20 of the first conductor 2 and W3 at the end of the conductor portion 30 of the second conductor 3. When the line length W1 is at least 1.7 times the shorter of the width dimensions W2 and W3, the conductive area between the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 increases, thus improving the conductivity of the joint 4.

[0027] Specifically, the electrical conductivity (IACS) of aluminum is 61.7% that of copper. Therefore, if the conductor portion of the first conductor is made of copper and the conductor portion of the second conductor is made of aluminum, in order to conduct current between the conductor portions of the first and second conductors, the area of ​​the end face of the conductor portion of the second conductor needs to be 1.7 times the area of ​​the end face of the conductor portion of the first conductor. Furthermore, assuming... Figure 6A As shown, when the end faces of the conductor portion 20a of the first conductor 2 and the conductor portion 30a of the second conductor 3 are flat, even if the end faces of the conductor portion 20a and the conductor portion 30a are butt-joined with a 100% joint efficiency, only 61.7% of the area of ​​the end face of the conductor portion 30a is joined to the end face of the conductor portion 20a. That is, as Figure 6B As shown, the portion marked A on the end face of the conductor portion 30a of the second conductor 3 does not contact the conductor portion 20a of the first conductor 2. Therefore, electrical and mechanical properties may be reduced at the junction of the conductor portion 20a of the first conductor 2 and the conductor portion 30a of the second conductor 3.

[0028] In contrast, in the conductor connection structure 1 of this embodiment, the overall length W1 of the joint 4 is at least 1.7 times shorter than the shorter of the width W2 at the end of the conductor portion 20 of the first conductor 2 and the width W3 at the end of the conductor portion 30 of the second conductor 3. Furthermore, the width W2 and thickness at the end of the conductor portion 20 of the first conductor 2 are approximately the same as the width W3 and thickness at the end of the conductor portion 30 of the second conductor 3, respectively. Therefore, even when the conductor portion 20 of the first conductor 2 is made of copper and the conductor portion 30 of the second conductor 3 is made of aluminum, the joint area between the conductor portion 20 and the conductor portion 30 is equal to the area of ​​the end face of the conductor portion 30, thus suppressing a decrease in electrical performance. Additionally, since the joint area between the conductor portion 20 and the conductor portion 30 is equal to the area of ​​the end face of the conductor portion 30, the mechanical strength of the joint 4 between the conductor portion 20 and the conductor portion 30 can be improved.

[0029] Furthermore, when the width dimension W2 at the end of the conductor portion 20 of the first conductor 2 and the width dimension W3 at the end of the conductor portion 30 of the second conductor 3 are the same, the overall line length W1 of the joint portion 4 is more than 1.7 times that of either the width dimension W2 or the width dimension W3.

[0030] In the conductor connection structure 1 of this embodiment, the overall line length W1 of the joint 4 only needs to be at least 1.7 times the shorter of the width dimensions W2 and W3. Therefore, the shapes of the ends of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 are not limited to... Figure 1 The shape shown.

[0031] For example, in Figure 2 In the conductor connection structure 1 shown, the conductor portion 20 of the first conductor 2 has a plurality of protrusions 202 that protrude toward the conductor portion 30 of the second conductor 3. Furthermore, each protrusion 202 is approximately triangular in shape when viewed from above. The conductor portion 30 of the second conductor 3 has recesses 302 that follow the shape of the plurality of protrusions 202. Moreover, each recess 302 is approximately triangular in shape when viewed from above. Therefore, the plurality of protrusions 202 in the conductor portion 20 of the first conductor 2 engage with the plurality of recesses 302 in the conductor portion 30 of the second conductor 3.

[0032] Furthermore, by bringing the end faces of the plurality of protrusions 202 in the conductor portion 20 of the first conductor 2 into contact with the end faces of the plurality of recesses 302 in the conductor portion 30 of the second conductor 3, the interfaces of the protrusions 202 and the recesses 302 are joined, thereby forming the joint portion 4. In this structure, the overall line length W1 of the joint portion 4 can be at least 1.7 times shorter than the shorter of the width dimension W2 at the end of the conductor portion 20 of the first conductor 2 and the width dimension W3 at the end of the conductor portion 30 of the second conductor 3.

[0033] In addition, such as Figure 1 As shown, when there is only one protrusion 201 in the conductor portion 20 of the first conductor 2, in order to make the line length W1 of the joint portion 4 more than 1.7 times the shorter of the width dimensions W2 and W3, it is necessary to increase the protrusion length of the protrusion 201 in the Y direction to a certain extent. However, as Figure 2 As shown, when there are multiple protrusions 201 in the conductor portion 20 of the first conductor 2, the protrusion length of the protrusion 201 in the Y direction can be shorter. Therefore, the protrusion length of the joint portion 4 in the Y direction can be shortened.

[0034] exist Figure 3 In the conductor connection structure 1 shown, the conductor portion 20 of the first conductor 2 has a protrusion 203 protruding toward the conductor portion 30 of the second conductor 3, and the conductor portion 30 of the second conductor 3 has a recess 303 following the shape of the protrusion 203. Furthermore, in the conductor portion 20 of the first conductor 2, a dovetail tenon, which is approximately trapezoidal in shape when viewed from above, is formed as the protrusion 203, and in the conductor portion 30 of the second conductor 3, a dovetail hole, following the shape of the dovetail tenon, is formed as the recess 303. After the protrusion 203 and the recess 303 are fitted together, the interface between the protrusion 202 and the recess 302 is joined, thereby forming the joint portion 4. With this wedge-shaped joint structure, the shorter of the overall linear length W1 of the joint portion 4 relative to the width dimension W2 at the end of the conductor portion 20 of the first conductor 2 and the width dimension W3 at the end of the conductor portion 3 of the second conductor 3 is at least 1.7 times.

[0035] In the conductor connection structure 1 of this embodiment, the first conductor 2 and the second conductor 3 only need to have plate-shaped ends; other shapes are not particularly limited. For example, the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be hollow or solid. At least one of the first conductor 2 and the second conductor 3 can be an electrical wire.

[0036] Figure 4 The diagram shows a conductor connection structure 1 where the first conductor is wire 2A. Figure 4 In the conductor connection structure 1, the wire 2A is a sheathed wire comprising multiple wires 20A as conductors and an insulating sheath 21A covering the multiple wires 20A. The wires 20A can be made of conductive metal materials such as copper, copper alloys, aluminum, or aluminum alloys. The insulating sheath 21A is formed of a resin material that is flexible and electrically insulating. Furthermore, the insulating sheath 21A is removed at one end of the wire 2A, exposing a portion of the wires 20A.

[0037] The wire 2A includes a core bundle 22, which is formed by shaping multiple exposed wires 20A and is generally rectangular in shape when viewed from above. The core bundle 22 corresponds to the end of the conductor portion 20 of the first conductor 2. Furthermore, an inclined surface 204A is formed between the multiple wires 20A, which are surrounded by an insulating sheath 21A, and the core bundle 22.

[0038] The core bundle 22 of the wire 2A has a protrusion 201A that protrudes toward the conductor portion 30 of the second conductor 3. Furthermore, the protrusion 201A is approximately triangular in shape when viewed from above. The conductor portion 30 of the second conductor 3 has a recess 301 that follows the shape of the protrusion 201A. Furthermore, the recess 301 is approximately triangular in shape when viewed from above. Therefore, the protrusion 201A in the core bundle 22 of the wire 2A has a structure that engages with the recess 301 in the conductor portion 30 of the second conductor 3.

[0039] Furthermore, with the end face of the protrusion 201A in the core bundle 22 of the wire 2A in contact with the end face of the recess 301 in the conductor portion 30 of the second conductor 3, the interface between the protrusion 201A and the recess 301 is joined, thereby forming the joint portion 4. The joint portion 4 extends from the surface of the core bundle 22 of the wire 2A and the conductor portion 30 of the second conductor 3 in the thickness direction, i.e., the Z direction, to the back surface. In addition, the joint portion 4 extends from one end of the core bundle 22 of the wire 2A and the conductor portion 30 of the second conductor 3 in the width direction, i.e., the X direction, to the other end. Moreover, the joint portion 4 is a portion made of an alloy of the metal constituting the wire 20A of the wire 2A and the metal constituting the conductor portion 30 of the second conductor 3.

[0040] As described above, in the conductor connection structure 1A of this embodiment, the first conductor 2 can be composed of an electric wire 2A, which includes a core wire bundle 22 composed of multiple wires 20A, and the end of the conductor portion 20 of the first conductor 2 can be composed of the core wire bundle 22.

[0041] Next, the manufacturing method of the conductor connection structure 1 of this embodiment will be described.

[0042] like Figure 5A As shown, firstly, a first conductor 2 and a second conductor 3 are prepared. The first conductor 2 has a conductor portion 20 with plate-shaped ends, and the second conductor 3 has a conductor portion 30 with plate-shaped ends.

[0043] Next, as Figure 5B As shown, a protrusion 201 is formed by machining the end face 205 of the conductor portion 20 of the first conductor 2 into a convex shape. Conversely, a recess 301 is formed by machining the end face 305 of the conductor portion 30 of the second conductor 3 into a concave shape.

[0044] Then, as Figure 5C As shown, with the end face of the protrusion 201 in the conductor portion 20 of the first conductor 2 abutting the end face of the recess 301 in the conductor portion 30 of the second conductor 3, the interface between the protrusion 201 and the recess 301 is joined, thereby forming the joint portion 4. The joining method is not particularly limited; joining methods such as FSW (friction stir bonding) and heat-pressing can be used. Additionally, laser welding can also be used as a joining method. Furthermore, in Figure 3 In the case of such a dovetail structure, it is also possible to join by pressing the protrusion 201 in the conductor portion 20 of the first conductor 2 into the recess 301 in the conductor portion 30 of the second conductor 3.

[0045] This manufacturing method allows for the production of a conductor connection structure 1 where the overall line length W1 of the joint 4 is at least 1.7 times the shorter of the width dimensions W2 and W3. Furthermore, by shaping the ends of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 into plate shapes, the protrusions 201 and concave portions 301 can be formed by stamping, thus enabling the protrusions 201 and concave portions 301 to be processed into uniform shapes.

[0046] Thus, the conductor connection structure 1 of this embodiment includes: a first conductor 2 having a conductor portion 20 with a plate-shaped end; and a second conductor 3 having a conductor portion 30 with a plate-shaped end. The width and thickness dimensions at the end of the conductor portion 20 of the first conductor 2 are approximately the same as the width and thickness dimensions at the end of the conductor portion 30 of the second conductor 3. The end faces of the conductor portion 20 of the first conductor 2 and the end faces of the conductor portion 30 of the second conductor 3 are joined by a joint 4, and the end faces of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 are not joined in a state of overlapping each other in the thickness direction. Moreover, when viewed from above, the overall line length W1 of the joint 4 is at least 1.7 times shorter than the shorter of the width dimension W2 at the end of the conductor portion 20 of the first conductor 2 and the width dimension W3 at the end of the conductor portion 30 of the second conductor 3.

[0047] In conductor connection structure 1, the overall length W1 of the joint 4 is at least 1.7 times the shorter of the width W2 at the end of the conductor portion 20 of the first conductor 2 and the width W3 at the end of the conductor portion 30 of the second conductor 3. Therefore, the joint area between conductor portion 20 and conductor portion 30 is equal to the area of ​​the end face of conductor portion 30, thus suppressing a decrease in electrical performance. Furthermore, since the joint area between conductor portion 20 and conductor portion 30 is equal to the area of ​​the end face of conductor portion 30, the mechanical strength of the joint 4 between conductor portion 20 and conductor portion 30 can be improved. As a result, the reliability of the joint 4 between the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be ensured.

[0048] Furthermore, in the conductor connection structure 1, the end faces of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 are joined by the joining portion 4, while the ends of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 are not joined, but rather stacked on top of each other in the thickness direction. Therefore, the thickness of the joining portion between the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 is reduced, thus enabling the conductor connection structure 1 to be made thinner.

[0049] In the conductor connection structure 1 of this embodiment, preferably, at least one protrusion 201 is formed at one end of the conductor portion 20 of the first conductor 2 and the end of the conductor portion 30 of the second conductor 3, and a recess 301 that engages with the protrusion 201 is formed at the other end of the conductor portion 20 of the first conductor 2 and the end of the conductor portion 30 of the second conductor 3. With this structure, the shorter of the overall line length W1 of the joint 4 relative to the width dimension W2 at the end of the conductor portion 20 of the first conductor 2 and the width dimension W3 at the end of the conductor portion 30 of the second conductor 3 can be at least 1.7 times. Furthermore, in Figures 1 to 5CThe diagram shows a structure in which a protrusion 201 is formed at the end of the conductor portion 20 of the first conductor 2, and a recess 301 is formed at the end of the conductor portion 30 of the second conductor 3. However, this embodiment is not limited to such a structure, and the above-mentioned effects can be obtained even in a structure in which a recess is formed at the end of the conductor portion 20 of the first conductor 2 and a protrusion is formed at the end of the conductor portion 30 of the second conductor 3.

[0050] In the conductor connection structure 1 of this embodiment, the first conductor 2 may be an electric wire having a core bundle 22 composed of multiple wires 20A, and the end of the conductor portion 20 of the first conductor 2 may be composed of the core bundle 22. Therefore, when using a terminal as the second conductor 3, a terminal-equipped electric wire with excellent conductivity and connection strength between the second conductor 3 and the first conductor 2 can be obtained.

[0051] In the conductor connection structure 1 of this embodiment, one of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be made of copper or a copper alloy, and the other of the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 can be made of aluminum or an aluminum alloy. In the conductor connection structure 1, the joint area of ​​the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3 is equal to the area of ​​the end face of the conductor portion 30 of the second conductor 3, thus suppressing the degradation of electrical performance between the first conductor 2 and the second conductor 3. Therefore, even if the aforementioned metals are used as the conductor portion 20 of the first conductor 2 and the conductor portion 30 of the second conductor 3, good conductivity between them can be achieved.

[0052] The foregoing has described several embodiments of the present invention, but these embodiments are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, and are also included in the scope of the invention described in the claims and its equivalents.

Claims

1. A conductor connection structure, characterized in that, have: A first conductor, the first conductor having a conductor portion with plate-shaped ends; and The second conductor has a conductor portion with plate-shaped ends. The width and thickness dimensions at the end of the conductor portion of the first conductor are approximately the same as those at the end of the conductor portion of the second conductor. The end face of the conductor portion of the first conductor and the end face of the conductor portion of the second conductor are joined by a joint, but the ends of the conductor portions of the first conductor and the second conductor are not joined in a state where they overlap each other in the thickness direction. When viewed from above, the overall line length of the joint is more than 1.7 times the shorter of the width dimension at the end of the conductor portion of the first conductor and the width dimension at the end of the conductor portion of the second conductor.

2. The conductor connection structure according to claim 1, characterized in that, At least one protrusion is formed at the end of the conductor portion of the first conductor and the end of the conductor portion of the second conductor. A recess that engages with the protrusion is formed at the other end of the conductor portion of the first conductor and the conductor portion of the second conductor.

3. The conductor connection structure according to claim 1 or 2, characterized in that, The first conductor is an electrical wire having a core bundle consisting of multiple wires, and the end of the conductor portion of the first conductor is formed by the core bundle.

4. The conductor connection structure according to claim 1 or 2, characterized in that, One of the conductor portions of the first conductor and the second conductor is made of copper or a copper alloy, and the other of the conductor portions of the first conductor and the second conductor is made of aluminum or an aluminum alloy.

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