Electrical junction box unit, and heat dissipation structure for the electrical junction box

Abstract

To provide an electric connection box unit, and a heat dissipation structure for the electric connection box, which are excellent in heat dissipation without increasing the number of components and enlarging the components.SOLUTION: An electric connection box unit 100 includes: an electric connection box 1 for storing an electronic component R inside; a first terminated electric wire 30, which electrically connects a first external device with the electric connection box 1; and a second terminated electric wire 40, which electrically connects a second external device with the electric connection box 1. The electric connection box 1 includes a stud bolt S which is electrically connected to the electronic component R inside, and the first terminated electric wire 30 and the second terminated electric wire 40 are fastened together to the stud bolt S.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electrical junction box unit and a heat dissipation structure for an electrical junction box. [Background Art]

[0002] Conventionally, electrical junction boxes that are mounted on vehicles and accommodate various electronic components such as fuses, relays, and electronic control units inside an accommodation space have been proposed. For example, one conventional electrical junction box has a stud bolt that is electrically connected to an electronic component accommodated therein, and an electric wire with a terminal connected to an external device is fastened to the stud bolt, so that the external device and the electronic component are electrically connected to each other (see, for example, Patent Document 1). [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2020-127249 [Summary of the Invention] [Problems to be Solved by the Invention]

[0004] Incidentally, when a conventional electrical junction box is energized to electrically connect an external device and an electronic component via the above-described terminal-equipped electric wire, stud bolt, or the like, for example, heat is generated at the contact point between the stud bolt and the terminal-equipped electric wire, and at the contact point between the stud bolt and the electronic component, and a connecting component (e.g., a bus bar) that connects the stud bolt and the electronic component, which may cause an increase in the internal temperature of the electrical junction box. For this reason, in conventional electrical junction boxes, a heat dissipation member or the like is sometimes provided to suppress an increase in internal temperature, but this is not preferable because it increases the number of components and increases the size of the electrical junction box.

[0005] This invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an electrical junction box unit with excellent heat dissipation without increasing the number of components or increasing the size, and a heat dissipation structure for an electrical junction box. [Means for solving the problem]

[0006] To achieve the aforementioned objectives, the electrical junction box unit according to the present invention is characterized by the following:

[0007] An electrical connection box that houses electronic components inside, A first terminal wire for electrically connecting the first external device and the electrical connection box, A wire with a second terminal for electrically connecting the second external device and the electrical connection box, An electrical junction box unit equipped with, The aforementioned electrical junction box is The interior of the aforementioned component has a stud bolt that is electrically connected to the electronic component, The first terminal-equipped wire and the second terminal-equipped wire are, The aforementioned stud bolts are fastened together Re, When either the first terminal wire or the second terminal wire is energized, the other terminal wire is de-energized. The heat generated when the one terminal-equipped wire is energized is dissipated to the outside through the other terminal-equipped wire. It must be an electrical junction box unit.

[0008] To achieve the aforementioned objectives, the heat dissipation structure for the electrical junction box according to the present invention is characterized by the following:

[0009] A heat dissipation structure for an electrical junction box connected between the starter and the battery or alternator, The aforementioned electrical junction box is It has an electronic component housed inside and a stud bolt that is electrically connected to the electronic component, The aforementioned stud bolts include: The first terminal wire connected to the starter and the second terminal wire connected to the battery or the alternator are fastened together. Re, When either the first terminal wire or the second terminal wire is energized, the other terminal wire is de-energized. The heat generated when the one terminal-equipped wire is energized is dissipated to the outside through the other terminal-equipped wire. The electrical junction box must have a heat dissipation structure. [Effects of the Invention]

[0010] The electrical junction box unit and the heat dissipation structure for the electrical junction box according to the present invention are described below. According to the present invention, a first terminal wire connected to a first external device and a second terminal wire connected to a second external device are fastened together with a stud bolt of an electrical junction box. For example, if the first external device is a short-term load device (a device with a relatively short on / off cycle, such as a starter) and the second external device is a long-term load device (a device with a relatively long on / off cycle, such as a battery or alternator), there is a period of time when current flows through the second terminal wire and no current flows through the first terminal wire. Therefore, heat such as Joule heat generated by the current flowing through the second terminal wire is dissipated to the outside through the first terminal wire, which is not carrying current, by fastening the first terminal wire and the second terminal wire together. In other words, in the above case, at least the first terminal wire functions as a heat dissipation member. Thus, this electrical junction box unit configuration can achieve excellent heat dissipation without increasing the number of components or increasing its size.

[0011] The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by referring to the attached drawings and reading through the embodiments for carrying out the invention described below (hereinafter referred to as "embodiments"). [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a perspective view of an electrical junction box unit according to an embodiment of the present invention. [Figure 2] Figure 2 is an exploded view of the main parts of Figure 1. [Figure 3] Figure 3 is an enlarged view of Figure 1 showing a heat dissipation structure according to an embodiment of the present invention. [Figure 4] Figure 4 is an exploded view of the main parts of Figure 3. [Figure 5] Fig. 5 is a cross-sectional view taken along line A-A of Fig. 1, which is for explaining heat dissipation when a starter of a vehicle on which the electrical connection box is mounted is operated. [Figure 6] Fig. 6 is a cross-sectional view taken along line A-A of Fig. 1, which is for explaining heat dissipation when a battery of a vehicle on which the electrical connection box is mounted is operated. MODE FOR CARRYING OUT THE INVENTION

[0013] <Embodiment> Hereinafter, embodiments of the present invention will be described with reference to the drawings. An electrical connection box unit 100 is constituted by: an electrical connection box 1 having a stud bolt S provided in an inner space thereof; and a first electric wire with terminal 30 and a second electric wire with terminal 40 that are fastened together onto the stud bolt S.

[0014] The electrical connection box 1 is typically a relay box that is mounted on a vehicle and has an internal space for accommodating an electronic component such as a relay and other electronic components R (see Figs. 1 and 2). In this example, the electric wire with terminal 30 electrically connects the electrical connection box 1 and a starter (not shown) of the vehicle on which the electrical connection box 1 is mounted, and the electric wire with terminal 40 electrically connects the electrical connection box 1 and a battery (not shown) of the vehicle.

[0015] Hereinafter, for convenience of description, "front", "rear", "left", "right", "upper" and "lower" are defined as shown in Figs. 1 to 6. The "front-rear direction", "left-right direction" and "up-down direction" are orthogonal to each other.

[0016] <Electrical connection box 1> An outline of the electrical connection box 1 will be described below. As shown in Figs. 1 and 2, the electrical connection box 1 is constituted by a frame 10 and a lower cover assembled below the frame 10 so as to close a lower end opening of the frame 10. All of the above two components constituting the electrical connection box 1 are resin molded articles.

[0017] In the electrical junction box 1, as shown in Figure 1, an electric wire (not shown) that is electrically connected to a part of the electronic component R located inside the electrical junction box 1 is led out to the outside of the electrical junction box 1 through an electric wire exit hole 2 provided on the right front part of the electrical junction box 1.

[0018] A stud bolt S is provided in the front right part of the internal space of the electrical junction box 1. The stud bolt S is connected to the electronic components R etc. mounted in the electrical junction box 1 within the internal space via a bus bar B (see Figures 3 to 6), and terminal wires 30 and 40 connected to a battery (not shown) are fastened to the stud bolt S, thereby enabling an electrical connection between the electronic components R etc. and the battery.

[0019] The electrical junction box 1 may also be equipped with an upper cover (not shown) as needed. The upper cover is, for example, a molded resin body and is assembled above the frame 10 so as to close the upper end opening of the frame 10. The electrical junction box 1 may also be equipped with a side cover (not shown) as needed. The side cover is, for example, a molded resin body and is assembled to the side wall portion 11 (assembled portion 15) of the frame 10. The frame 10 and lower cover 20 that constitute the electrical junction box 1 will be described in order below.

[0020] First, let's describe the frame 10. As shown in Figures 1 and 2, the frame 10 has a roughly rectangular cylindrical side wall portion 11 that extends in the vertical direction. The side wall portion 11 constitutes the majority of the external appearance of the side of the electrical connection box 1.

[0021] Multiple circumferential locations (eight locations in this example) on the outer surface of the lower end of the side wall portion 11 are integrally provided with locking portions 12, each including a through hole extending in the vertical direction. The locking portions 12 have the function of assembling the lower cover 20 to the frame 10.

[0022] A semi-cylindrical trough-shaped portion 13, which opens downwards, is provided in the side wall portion 11 at the location corresponding to the wire exit hole 2 at the front right, extending to the right. The trough-shaped portion 13 has the function of forming the upper part of the inner wall that defines the wire exit hole 2 at the front right.

[0023] Multiple circumferential outer surfaces at the lower end of the side wall portion 11 are integrally provided with downward-extending stay portions 14. The stay portions 14 have the function of fixing the frame 10 (i.e., the electrical connection box 1) to the vehicle's mounting location by assembling their tips to the vehicle's mounting location.

[0024] Near the stud bolt S on the front right side of the side wall portion 11, there is a mounting portion 15 to which the side cover will be assembled if the electrical connection box 1 is equipped with a side cover. The mounting portion 15 is provided with a locking portion (not shown) to which, for example, the locking portion (not shown) of the side cover will be locked.

[0025] Multiple locking portions 16 are integrally provided on the outer surface of several locations (four locations in this example) in the circumferential direction at the upper end of the side wall portion 11. The locking portions 16 have the function of assembling the upper cover to the frame 10 when the electrical connection box 1 is equipped with an upper cover.

[0026] Next, the lower cover 20 will be described. As shown in Figures 1 and 2, the lower cover 20 integrally comprises an annular side wall portion 21 that constitutes most of the external appearance of the lower side surface of the electrical junction box 1, and a bottom wall portion 22 that closes the annular lower end opening of the side wall portion 21 and constitutes most of the external appearance of the bottom surface of the electrical junction box 1. The annular upper end edge of the side wall portion 21 has a shape that corresponds to the annular lower end edge of the side wall portion 11 of the frame 10, and is capable of being fitted with the annular lower end edge of the side wall portion 11.

[0027] Multiple locking pieces 23 extending upward are integrally provided on the outer surface of the upper end of the side wall portion 21 at multiple locations in the circumferential direction (eight locations in this example), corresponding to multiple locking portions 12 of the frame 10.

[0028] A semi-cylindrical trough-shaped portion 24, which opens upward, is provided in the side wall portion 21 at the location corresponding to the wire exit hole 2 at the front right, extending to the right. The trough-shaped portion 24 has the function of forming the lower part of the inner wall that defines the wire exit hole 2 at the front right.

[0029] The frame 10 and lower cover 20 that constitute the electrical junction box 1 have been described above. In order to assemble the electrical junction box 1, which consists of the frame 10 and the lower cover 20, it is necessary to attach the lower cover 20 to the frame 10.

[0030] To assemble the lower cover 20 to the frame 10, the multiple locking pieces 23 (see Figure 2) of the lower cover 20 are inserted from below into the multiple through holes in the locking portion 12 (see Figure 2) of the frame 10. From this position, the annular upper end edge of the side wall portion 21 of the lower cover 20 is fitted onto the annular lower end edge of the side wall portion 11 of the frame 10, and the multiple locking pieces 23 are locked to the multiple locking portions 12. This completes the assembly of the lower cover 20 to the frame 10. This completes the electrical connection box 1.

[0031] When the electrical junction box 1 is assembled, the locking of the multiple locking pieces 23 and the multiple locking parts 12 prevents the lower cover 20 from separating downward from the frame 10. Furthermore, in the above state, the trough-shaped part 13 of the frame 10 and the trough-shaped part 24 of the lower cover 20 define the wire exit hole 2 at the front right through which the electric wire (not shown) is inserted.

[0032] <Electric wire with terminals 30> The terminal-equipped wire 30 will now be described. As shown in Figure 3, the terminal-equipped wire 30 consists of a roughly L-shaped terminal 31 and a wire 32 to which the terminal 31 is connected. One end of the terminal-equipped wire 30 is connected (fastened) to the stud bolt S, and the other end is connected to the starter.

[0033] As shown in Figure 4, the terminal 31 is integrally constructed with a wire connection portion 33 that extends vertically and connects to the electric wire 32, and a bolt connection portion 34 that extends rearward from the upper end of the wire connection portion 33 and fastens to the stud bolt S. The bolt connection portion 34 is provided with a hole 35 that penetrates vertically and through which the stud bolt S is inserted.

[0034] As shown in Figures 5 and 6, the electric wire 32 is composed of a conductor core wire 36 and an insulating sheath 37 that surrounds the conductor core wire 36. The conductor core wire 36 may be a single wire or a stranded wire in which multiple conductors are twisted together.

[0035] <Electric wire with terminals 40> The terminal-equipped wire 40 will now be described. As shown in Figure 3, the terminal-equipped wire 40 consists of a roughly L-shaped terminal 41 and a wire 32 to which the terminal 41 is connected. One end of the terminal-equipped wire 40 is connected (fastened) to a stud bolt S, and the other end is connected to a battery or alternator (in this example, for the sake of explanation, a battery).

[0036] As shown in Figure 4, the terminal 41 is integrally constructed with a wire connection portion 43 that extends vertically and connects to the electric wire 42, and a bolt connection portion 44 that extends rearward from the upper end of the wire connection portion 43 and fastens to the stud bolt S. The bolt connection portion 44 is provided with a hole 45 that penetrates vertically and through which the stud bolt S is inserted. As shown in Figures 5 and 6, the length of the bolt connection portion 44 in the front-rear direction is longer than the length of the bolt connection portion 34 of the terminal-equipped electric wire 30 in the front-rear direction.

[0037] As shown in Figures 5 and 6, the electric wire 42 is composed of a conductor core wire 46 and an insulating sheath 47 that surrounds the conductor core wire 46. The conductor core wire 46 may be a single wire or a stranded wire in which multiple conductors are twisted together.

[0038] <Heat dissipation structure of electrical junction box 1> The following describes the heat dissipation structure of the electrical junction box 1. In order to realize the heat dissipation structure of the electrical junction box 1, it is first necessary to complete the electrical junction box unit 100. Specifically, the stud bolt S of the electrical junction box 1 is inserted through the hole 35 of the terminal wire 30 and the hole 45 of the terminal wire 40, and a nut N is screwed onto the stud bolt S to fasten the terminal wires 30 and 40 together to the stud bolt S. At this time, since the bolt connection portion 44 of the terminal wire 40 is longer in the front-to-back direction than the bolt connection portion 34 of the terminal wire 30, the bolt connection portion 44 is positioned above the bolt connection portion 34.

[0039] Then, the other end of the terminal-equipped wire 30 is connected to the starter of the vehicle on which the electrical junction box 1 is mounted, and the other end of the terminal-equipped wire 40 is connected to the battery of the same vehicle. This completes the electrical junction box unit 100. Note that the order of fastening the terminal-equipped wires 30 and 40 together to the stud bolt S, and the connection of the terminal-equipped wire 30 to the starter and the connection of the terminal-equipped wire 40 to the battery does not matter.

[0040] When the starter is activated with the electrical junction box unit 100 completed, current flows from the starter to the corresponding electronic component R via the terminal wire 30, stud bolt S, and busbar B (see arrow Y1 in Figure 5). At this time, no current flows through the terminal wire 40, so the heat generated during energization, such as Joule heating, is dissipated to the outside via the terminal wire 40 (see arrow Y2 in Figure 5).

[0041] On the other hand, when the battery is activated, current flows from the battery to the corresponding electronic component R via the terminal wire 40, the stud bolt S, and the busbar B (see arrow Y1 in Figure 6). At this time, no current flows through the terminal wire 30, so the heat generated during energization, such as Joule heating, is dissipated to the outside via the terminal wire 30 (see arrow Y2 in Figure 6). In addition, the heat is also dissipated to the outside via the terminal wire 40, which has a large surface area (see arrow Y2 in Figure 6).

[0042] In this way, by fastening the terminal-equipped wires 30 and 40 together, the heat generated when one is energized is dissipated to the outside at least through the other, which is not energized. In other words, when one of the terminal-equipped wires 30 and 40 is energized, at least the other, which is not energized, functions as a heat dissipation member. As a result, the electrical junction box 1 (electrical junction box unit 100) can achieve excellent heat dissipation without increasing the number of components or increasing its size.

[0043] In this example, a starter and a battery were used as examples of combinations connected to terminal wires 30 and 40. However, the present invention can be realized by connecting short-term load equipment (equipment with a relatively short on / off cycle) to terminal wire 30 and long-term load equipment (equipment with a relatively long on / off cycle) to terminal wire 40. However, from the viewpoint of heat dissipation, it is preferable that the energization of the "long-term load" and the energization of the "short-term load" do not overlap in terms of time.

[0044] Short-term loads include devices such as power windows, door locks, power sliding doors, door closers, door mirrors, and sunshades, while long-term loads include air conditioners, lamps, and heaters.

[0045] <Effects and Actions> In this embodiment, the terminal-equipped wire 30 connected to the starter (short-term load) and the second terminal-equipped wire 40 connected to the battery or alternator (long-term load) are fastened together to the stud bolt S of the electrical connection box 1. As a result, when the starter is operating, current flows through the terminal-equipped wire 30, and the terminal-equipped wire 40, which does not carry current, functions as a heat dissipation member (see Figure 5). On the other hand, when the battery or alternator is operating, current flows through the terminal-equipped wire 40, and the terminal-equipped wire 30, which does not carry current, functions as a heat dissipation member (see Figure 6). Thus, according to this embodiment, excellent heat dissipation can be achieved without increasing the number of parts or increasing the size.

[0046] <Other forms> Furthermore, the present invention is not limited to the embodiments described above, and can be modified, improved, etc., as appropriate. In addition, the material, shape, dimensions, number, placement, etc. of each component in the embodiments described above are arbitrary and not limited, as long as they can achieve the present invention.

[0047] For example, if the power supply to both devices does not overlap in terms of time, the terminal-equipped wires 30 and 40 may both be connected to devices subject to long-term loads.

[0048] Herein, the features of the embodiments of the electrical junction box unit and the heat dissipation structure for the electrical junction box according to the present invention described above are briefly listed below in [1] to [4].

[0049] [1] An electrical connection box (1) that houses an electronic component (R) inside, A first terminal wire (30) electrically connects the first external device and the electrical connection box (1), A second terminal wire (40) electrically connects the second external device and the electrical connection box (1), An electrical junction box unit (100) equipped with, The aforementioned electrical junction box (1) is The interior of the electronic component (R) has a stud bolt (S) which is electrically connected to it. The first terminal-equipped wire (30) and the second terminal-equipped wire (40) are, The stud bolt (S) is fastened together with the aforementioned stud bolt (S). Electrical junction box unit (100).

[0050] In the electrical junction box unit with the configuration described in [1] above, the first terminal wire connected to the first external device and the second terminal wire connected to the second external device are fastened together with the stud bolts of the electrical junction box. For example, if the first external device is a short-term load device (a device with a relatively short cycle of switching between on and off operation) and the second external device is a long-term load device (a device with a relatively long cycle of switching between on and off operation), there is at least a period when current flows through the second terminal wire and no current flows through the first terminal wire. Therefore, the heat such as Joule heat generated by the current flowing through the second terminal wire is dissipated to the outside through the first terminal wire, which does not carry current, by fastening the first terminal wire and the second terminal wire together. In other words, in the above case, at least the first terminal wire functions as a heat dissipation member. Thus, the electrical junction box unit with this configuration can achieve excellent heat dissipation without increasing the number of components or increasing the size.

[0051] [2] In the electrical junction box unit (100) described in [1] above, The aforementioned first external device is a starter, The aforementioned second external device is a battery or an alternator. Electrical junction box unit (100).

[0052] According to the electrical junction box unit with the configuration described in [2] above, the first external device is a starter (short-term load), and the second external device is a battery or alternator (long-term load). As a result, when the starter is operating, current flows through the wire with the first terminal, and the wire with the second terminal, which does not carry current, functions as a heat dissipation material. On the other hand, when the battery or alternator is operating, current flows through the wire with the second terminal, and the wire with the first terminal, which does not carry current, functions as a heat dissipation material.

[0053] [3] In the electrical junction box unit (100) described in [1] or [2] above, The first terminal-equipped wire (30) is The terminal (31) has an L-shaped configuration consisting of a wire connection portion (33) connected to a wire (32) and a bolt connection portion (34) fastened and connected to the stud bolt (S). The second terminal-equipped wire (40) is The terminal (41) has an L-shaped configuration consisting of a wire connection part (43) connected to a wire (42) and a bolt connection part (44) fastened and connected to the stud bolt (S). The bolt connection portion (44) of the second terminal-equipped electric wire (40) is In the extending direction (front-to-back direction) of the bolt connection portion (34) of the first terminal wire (30) and the bolt connection portion (44) of the second terminal wire (40), the length of the bolt connection portion (34) of the first terminal wire (30) is longer than that of the bolt connection portion (34) of the first terminal wire (30). Electrical junction box unit (100).

[0054] According to the electrical junction box unit with the configuration described in [3] above, the bolt connection portion of the second terminal wire is longer in the extending direction than the bolt connection portion of the first terminal wire. In other words, the second terminal wire has a larger surface area than the first terminal wire. For example, by connecting the second terminal wire to the equipment with the long-term load described above, heat dissipation can be ensured even in the second terminal wire through which current flows when the long-term load is energized.

[0055] [4] A heat dissipation structure for an electrical junction box connected between the starter and the battery or alternator, The aforementioned electrical junction box (1) is An electronic component (R) is housed inside, and a stud bolt (S) is electrically connected to the electronic component (R), The aforementioned stud bolt (S) is: The first terminal wire (30) connected to the starter and the second terminal wire (40) connected to the battery or the alternator are fastened together. Heat dissipation structure for electrical junction boxes.

[0056] According to the heat dissipation structure of the electrical junction box with the configuration described in [4] above, the wire with a first terminal connected to the starter (short-term load) and the wire with a second terminal connected to the battery or alternator (long-term load) are fastened together with the stud bolt of the electrical junction box. As a result, when the starter is operating, current flows through the wire with the first terminal, and the wire with the second terminal, which does not carry current, functions as a heat dissipation material. On the other hand, when the battery or alternator is operating, current flows through the wire with the second terminal, and the wire with the first terminal, which does not carry current, functions as a heat dissipation material. In this way, the electrical junction box unit with this configuration can achieve excellent heat dissipation without increasing the number of parts or increasing the size. [Explanation of symbols]

[0057] 1. Electrical junction box 2 Wire extraction hole 10 frames 11 Side wall section 12 Locked part 13 Gutter-like part 14. Stay section 15 Assembled part 16 Locked part 20 Lower Cover 21 Side wall section 22 Bottom wall section 23 Locking piece 24 Gutter-shaped part 30. Wire with terminals (wire with first terminal) Terminals 31, 41 32,42 Electric wire 33,43 Wire connection section 34, 44 Bolt connection 35,45 hole 36,46 Conductor core wire 37,47 Insulating coating 40. Wire with terminals (wire with second terminal) 100 Electrical junction box unit B Bassba N Nut R Electronic parts S Stud Bolt

Claims

1. An electrical connection box that houses electronic components inside, A first terminal wire for electrically connecting the first external device and the electrical connection box, A wire with a second terminal for electrically connecting the second external device and the electrical connection box, An electrical junction box unit equipped with, The aforementioned electrical junction box is The interior of the aforementioned component has a stud bolt that is electrically connected to the electronic component, The first terminal-equipped wire and the second terminal-equipped wire are, The aforementioned stud bolts are fastened together, When either the first terminal wire or the second terminal wire is energized, the other terminal wire is de-energized. The heat generated when the one terminal-equipped wire is energized is dissipated to the outside through the other terminal-equipped wire. Electrical junction box unit.

2. In the electrical junction box unit according to claim 1, The first external device is a starter, The aforementioned second external device is a battery or an alternator. Electrical junction box unit.

3. An electrical connection box for housing electronic components inside, A first terminal wire for electrically connecting the first external device and the electrical connection box, A wire with a second terminal for electrically connecting the second external device and the electrical connection box, An electrical junction box unit equipped with, The aforementioned electrical junction box is The interior of the aforementioned component has a stud bolt that is electrically connected to the electronic component, The first terminal-equipped wire and the second terminal-equipped wire are, The aforementioned stud bolts are fastened together, The first terminal-equipped wire is It has an L-shaped terminal consisting of a wire connection part that is connected to an electric wire and a bolt connection part that is fastened and connected to the stud bolt, The wire with the second terminal is, It has an L-shaped terminal consisting of a wire connection part that is connected to an electric wire and a bolt connection part that is fastened and connected to the stud bolt, The bolt connection portion of the second terminal-equipped electric wire is In the direction of extension of the bolt connection portion of the first terminal-equipped electric wire and the bolt connection portion of the second terminal-equipped electric wire, a portion longer than the bolt connection portion of the first terminal-equipped electric wire is provided. Electrical junction box unit.

4. A heat dissipation structure for an electrical junction box connected between the starter and the battery or alternator, The aforementioned electrical junction box is It has an electronic component housed inside and a stud bolt that is electrically connected to the electronic component, The aforementioned stud bolts include: The first terminal wire connected to the starter and the second terminal wire connected to the battery or the alternator are fastened together. When either the first terminal wire or the second terminal wire is energized, the other terminal wire is de-energized. The heat generated when the one terminal-equipped wire is energized is dissipated to the outside through the other terminal-equipped wire. Heat dissipation structure for electrical junction boxes.

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