Electrical junction box

Abstract

To provide an electric connection box with excellent heat dissipation properties.SOLUTION: An electrical connection box 1 includes a cooling body 2 capable of absorbing heat from an outer surface thereof and dissipating heat to the outside, and a pair of current-carrying bodies 3A, 3B arranged to interpose the cooling body 2 therebetween. Each of the pair of current-carrying bodies 3A, 3B includes a housing portion 20, electronic components 30, 40 arranged inside the housing portion 20, and a bus bar 50 that is provided on a mounting wall 21 which is a box wall of the housing portion 20 and to which the electronic components 30, 40 are electrically connected, and is arranged such that the outer surface of the mounting wall 21 faces the outer surface of the cooling body 2. The electronic component 30 includes a plurality of terminals 31 that are provided on a side wall of the electronic component 30 and connected to the bus bar 50, and a movable contact 32 that is provided inside the electronic component 30 and capable of mechanically switching between electrical conductivity and non-conductivity between the plurality of terminals 31, and is configured such that the movable contact 32 is located farther from the side wall than the plurality of terminals 31 inside the electronic component 30.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an electrical connection box including a cooling body capable of absorbing heat from an outer surface and radiating heat to the outside, and a pair of current-carrying bodies arranged so as to sandwich the cooling body.

Background Art

[0002] Conventionally, electrical connection boxes mounted on vehicles and the like have been proposed. For example, one type of conventional electrical connection box has a box-shaped overall shape, and includes a bus bar connected to an external power source or the like, electronic components such as relays and fuses connected to the bus bar, and a case for housing the bus bar and the electronic components (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above-described type of electrical connection box, generally, when electronic components (especially relays and fuses) operate, Joule heat generated by energization occurs in the internal circuits and bus bars of the electronic components. From the viewpoint of properly operating the electronic components over a long period of time, it is desirable to efficiently radiate the heat generated at various locations during energization to the outside.

[0005] One object of the present invention is to provide an electrical connection box having excellent heat dissipation properties.

Means for Solving the Problems

[0006] In order to achieve the above-described object, the electrical connection box according to the present invention is characterized as follows.

[0007] An electrical connection box comprising a cooling element capable of absorbing heat from its outer surface and dissipating heat to the outside, and a pair of current-carrying elements arranged so as to sandwich the cooling element, Each of the pair of current-carrying bodies is The device comprises a box-shaped housing, electronic components arranged inside the housing, and a busbar provided on one of the housing's box walls, which is a mounting wall, to which the electronic components are electrically connected, and the outer surface of the mounting wall is positioned to face the outer surface of the cooling body. The aforementioned electronic component is The electronic component has a plurality of terminals provided on its side wall and connected to the busbar, and a movable contact provided inside the electronic component that can mechanically switch between conductivity and non-conductivity between predetermined terminals among the plurality of terminals, and is configured such that the movable contact is located further from the side wall than the plurality of terminals inside the electronic component. It must be an electrical junction box. [Effects of the Invention]

[0008] In the electrical junction box according to the present invention, a pair of current-carrying bodies containing electronic components and busbars are arranged such that the outer surfaces of the mounting walls of each of the current-carrying bodies face the outer surface of the cooling body, sandwiching the cooling body. As a result, Joule heat generated when current is applied to the internal circuitry of the electronic components, the contact points between the electronic components and the busbars, and the busbars themselves is easily absorbed by the cooling body via the mounting walls. Furthermore, because the pair of current-carrying bodies are arranged to sandwich the cooling body, the heat absorption capacity of the cooling body can be utilized more efficiently compared to the case where only one outer surface of the cooling body is used for heat absorption. Thus, the electrical junction box with this configuration has excellent heat dissipation properties.

[0009] Furthermore, compared to simply arranging a pair of current-carrying elements side by side on one outer surface of the cooling element, the size of the cooling element can be reduced, thus enabling miniaturization and cost reduction of the electrical junction box. In addition, when the electrical junction box is used in a orientation where the outer surface of the cooling element and the mounting wall of the current-carrying elements extend vertically (up and down), the terminals and movable contacts inside the electronic components connected to the busbar will be arranged so as to be aligned in a direction that intersects the vertical direction (for example, horizontally). Therefore, even if components around the movable contacts fall off due to reasons such as aging deterioration or excessive external force, those components will fall downward in the vertical direction, thus preventing them from interfering with the switching between conductivity and non-conductivity between the movable contacts and the terminals.

[0010] 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]

[0011] [Figure 1] Figure 1 is a perspective view showing an electrical junction box according to an embodiment of the present invention. [Figure 2] Figure 2 is a top view of the electrical junction box shown in Figure 1, with the casing of the current-carrying element visible through it. [Figure 3] Figure 3 is a front view of the electrical junction box shown in Figure 1, with the casing of the current-carrying element viewed through. [Figure 4] Figure 4 is a cross-sectional view along the horizontal plane around the relay in the electrical junction box shown in Figure 1, showing the inside of the relay located inside the housing of the energizing element. [Modes for carrying out the invention]

[0012] <Embodiment> Hereinafter, an electrical junction box 1 according to an embodiment of the present invention will be described with reference to the drawings. The electrical junction box 1 is typically used mounted on a vehicle. Examples of electrical junction boxes 1 include, but are not limited to, junction boxes and relay boxes. As shown in Figure 1, the electrical junction box 1 comprises a cooling body 2 and a pair of current-carrying bodies 3A and 3B arranged to sandwich the cooling body 2. The cooling body 2 and the pair of current-carrying bodies 3A and 3B are fixed to each other by fastening with bolts 4 and nuts 5.

[0013] For the sake of explanation, the "front-rear direction," "left-right direction," and "up-down direction" are defined below as shown in Figures 1 to 4. The "front-rear direction," "left-right direction," and "up-down direction" are orthogonal to each other. The "up-down direction" coincides with the up-down direction (vertical direction) of the vehicle when the electrical junction box 1 is mounted on the vehicle. The "front-rear direction" and "left-right direction" are defined solely for the sake of explanation and do not necessarily have to correspond to the front-rear direction and left-right direction of the vehicle when the electrical junction box 1 is mounted on the vehicle. The components that make up the electrical junction box 1 will be explained in order below.

[0014] First, let's describe the cooling body 2. As shown in Figures 1 and 2, the cooling body 2 has a rectangular parallelepiped-shaped main body 10 that extends in the left-right and up-down directions and is thin in the front-back direction. The main body 10 is made of, for example, metal or resin. An inlet passage 11 and an outlet passage 12 that communicate with the inside of the main body 10 are provided on the right end side wall of the main body 10, and the inlet passage 11 and the outlet passage 12 are connected to a heat sink (not shown) located outside the cooling body 2. Cooling water cooled by the heat sink is introduced into the inside of the main body 10 via the inlet passage 11 by a pump (not shown), etc., and absorbs heat from the outside through the outer wall of the main body 10. The cooling water that has absorbed heat (heated) is returned from the inside of the main body 10 via the outlet passage 12 to the heat sink and cooled again. By repeating this cycle, the cooling body 2 performs the function of absorbing heat from the outer surface of the main body 10 and dissipating heat to the outside.

[0015] Next, the pair of current-carrying elements 3A and 3B will be described. As shown in Figures 1 and 2, the pair of current-carrying elements 3A and 3B have the same external shape and the same structure, except that they differ in the presence or absence of the fuse 40 and the arrangement of the busbar 50 (see Figure 2). The pair of current-carrying elements 3A and 3B are arranged so as to sandwich the cooling body 2 in the front-to-back direction with their front-to-back orientations reversed (with their respective flange portions 22 facing each other in the front-to-back direction, as described later). It is preferable that the weights of the pair of current-carrying elements 3A and 3B are approximately the same so that there is no excessive difference in weight between the front and back of the cooling body 2 when the pair of current-carrying elements 3A and 3B are assembled to the cooling body 2. Below, we will first describe the current-carrying element 3A of the pair of current-carrying elements 3A and 3B.

[0016] As shown in Figures 1 to 3, the energizing body 3A includes a box-shaped housing 20, a plurality of relays 30 and fuses 40 arranged inside the housing 20, and a plurality of busbars 50 provided on one of the housing walls, which is a mounting wall 21, and electrically connected to the plurality of relays 30 and fuses 40.

[0017] The housing portion 20 has a rectangular box shape that extends in the left-right and up-down directions and is thick in the front-back direction. The housing portion 20 is made of resin, for example. The front end side wall of the housing portion 20 (a rectangular flat wall that extends in the left-right and up-down directions and is positioned opposite the rear end side wall of the cooling body 2) functions as a mounting wall 21 on which the busbar 50 is provided (see Figures 2 and 4). Multiple through holes 23 that penetrate the mounting wall 21 to the inside and outside are formed in the portion of the mounting wall 21 on which the busbar 50 is provided (see Figure 4). The function of providing such through holes 23 will be described later. The housing portion 20 is provided with a pair of left and right flange portions 22 that extend continuously outward on both sides in the left-right direction from the mounting wall 21. Multiple through holes (not shown) for inserting bolts 4 are provided in the flange portions 22, arranged in the vertical direction. The flange portions 22 are the parts used for the fastening described above using bolts 4 and nuts 5.

[0018] Inside the housing portion 20, as shown in FIG. 2, two relays 30 and one fuse 40 are arranged along the inner surface of the mounting wall 21 in the left - right direction in the vicinity of the inner surface of the mounting wall 21. The relay 30 is a component that performs a switch function for turning on and off the energization, and the fuse 40 is a component that performs a fuse function for turning off the energization when a current exceeding the rating flows. On the mounting wall 21, a plurality of flat busbars 50 are provided along the inner surface of the mounting wall 21 facing the inner surface and arranged in the left - right direction. Specifically, the plurality of busbars 50 are arranged such that a pair of left - right busbars 50 corresponding to each of the relay 30 and the fuse 40 are electrically connected.

[0019] Hereinafter, referring to FIG. 4, the internal structure of the relay 30 and the connection structure between the relay 30 and the pair of busbars 50 will be briefly described. The relay 30 includes a pair of metal terminals 31 provided so as to protrude outside from one side wall (front end side wall) of the housing of the relay 30, a metal movable contact 32 provided inside the housing of the relay 30 and capable of mechanically switching the conduction or non - conduction between the plurality of terminals 31, a coil 33 provided inside the housing of the relay 30 for driving the movable contact 32, and a contact spring 35 provided inside the housing of the relay 30 and arranged between the core 34 of the coil 33 and the movable contact 32. The contact spring 35 constantly biases the movable contact 32 to the conduction side (front side). When the coil 33 is energized, the coil 33 exhibits an attractive force that drives the movable contact 32 to the non - conduction side (rear side) against the biasing force of the contact spring 35. From the above, the relay 30 can mechanically switch the conduction or non - conduction between the plurality of terminals 31 by switching the non - energization / energization of the coil 33.

[0020] In relay 30, the movable contact 32 is located at a position (rear position) farther from one side wall (front end side wall) of the housing of relay 30 than the plurality of terminals 31, and the plurality of terminals 31 and the movable contact 32 are positioned side by side in the front-rear direction. Therefore, for example, even when components (such as coil 33) around the movable contact 32 fall off due to reasons such as aging deterioration or excessive external force, the components will fall downward in the vertical direction, so it can be avoided that the components interfere with the switching of conduction or non-conduction between the movable contact 32 and the plurality of terminals 31.

[0021] Each of the plurality of terminals 31 of relay 30 is fastened and fixed to the corresponding bus bar 50 by a metal bolt 51 in the recess of each of the corresponding pair of bus bars 50. Thereby, the pair of bus bars 50 and the relay 30 are fixed to each other, and the pair of bus bars 50 are electrically connected to the relay 30. The above is the description of the current-carrying body 3A among the pair of current-carrying bodies 3A and 3B.

[0022] Next, the current-carrying body 3B among the pair of current-carrying bodies 3A and 3B will be described. The current-carrying body 3B has the same outer shape as the current-carrying body 3A. The current-carrying body 3B has the same structure as the current-carrying body 3A except that the fuse 40 is not provided and accordingly the arrangement of the bus bar 50 is different (see FIG. 2). Therefore, the description of other detailed structures in the current-carrying body 3B will be omitted. The above is the description of each component constituting the electrical connection box 1.

[0023] Next, the assembly of the electrical junction box 1 will be described. To assemble the electrical junction box 1, as shown in Figure 1, the pair of current-carrying elements 3A and 3B are positioned on the rear and front sides of the cooler 2, respectively, so that the cooler 2 is sandwiched between them in the front-to-back direction. Next, a paste-like heat transfer paste 70 with excellent heat transfer properties is filled into the gaps between the outer surfaces of the mounting walls 21 of the opposing current-carrying elements 3A and the outer surface of the main body 10 of the cooler 2 (see Figure 4), and into the gaps between the outer surfaces of the mounting walls 21 of the opposing current-carrying elements 3B and the outer surface of the main body 10 of the cooler 2. Next, the cooler 2 and the pair of current-carrying elements 3A and 3B are fastened and fixed together using a plurality of bolts 4 and a plurality of nuts 5 that are collectively inserted through the flange portions 22 of the pair of current-carrying elements 3A and 3B and through holes (not shown) provided in the main body 10 of the cooler 2. Next, one busbar 50 provided on the mounting wall 21 of the energized body 3A and one busbar 50 provided on the mounting wall 21 of the energized body 3B are electrically connected by a connecting busbar 60 provided on the outside of the housing portion 20 of the energized bodies 3A and 3B (see Figure 2). This completes the assembly of the electrical junction box 1, and the electrical junction box 1 shown in Figure 1 is obtained. Alternatively, the busbars 50 may be connected to each other using electric wires instead of the connecting busbar 60.

[0024] In this example, as shown in Figure 1, etc., on both the left and right sides of the electrical junction box 1, locations where the bolt 4 is inserted from the front and fastened to the nut 5 on the rear side, and locations where the bolt 4 is inserted from the rear and fastened to the nut 5 on the front side are alternately arranged in the vertical direction. As a result, compared to a configuration where the bolt 4 is inserted from one side in the front-to-back direction and fastened to the nut 5 on the other side in the front-to-back direction at all fastening locations on both the left and right sides of the electrical junction box 1, the external forces acting on the pair of current-carrying bodies 3A and 3B that move closer to each other due to the fastening are more easily distributed evenly, making it less likely for the pair of current-carrying bodies 3A and 3B to tilt (float) relative to the cooling body 2 to occur.

[0025] In the assembled state of the electrical junction box 1, as shown in Figures 2 and 4, the pair of current-carrying elements 3A and 3B are arranged such that the outer surfaces of the mounting walls 21 of each current-carrying element 3A and 3B, on which the busbar 50 is provided, face the outer surface of the cooling element 2, and the cooling element 2 is sandwiched between them. As a result, when the pair of current-carrying elements 3A and 3B are energized, the Joule heat generated in the internal circuit of the relay 30 (especially the movable contacts 32 and coil 33), the contacts between the relay 30 and fuse 40 and the busbar 50, and the busbar 50 itself is easily absorbed by the cooling element 2 via the mounting walls 21 and the heat transfer paste 70. Furthermore, because the pair of current-carrying elements 3A and 3B are arranged to sandwich the cooling element 2, the heat absorption capacity of the cooling element 2 can be utilized more efficiently than when only one outer surface of the cooling element 2 is used for heat absorption.

[0026] Furthermore, in the assembled state of the electrical junction box 1, as shown in Figure 4, for each of the pair of current-carrying elements 3A and 3B, a portion of the heat transfer paste 70 placed in the gap between the outer surfaces of the mounting walls 21 and the outer surface of the main body 10 of the cooling element 2 passes through a plurality of through holes 23 provided in the mounting wall 21 and spreads to the inner surface of the mounting wall 21, contacting the busbar 50 facing the inner surface of the mounting wall 21 (see Figure 4). In other words, the heat transfer paste 70 is in contact with both the cooling element 2 and the busbar 50 via the through holes 23. As a result, the Joule heat generated at the contact points between the relay 30 and fuse 40 and the busbar 50, as well as the busbar 50 itself, can be efficiently transferred to the cooling element 2 via the heat transfer paste 70.

[0027] Furthermore, in the assembled state of the electrical junction box 1, multiple bolts 4 and multiple nuts 5 fix the pair of current-carrying elements 3A and 3B together by applying external force to bring them closer to each other. This ensures that the mounting walls 21 of the housing portions 20 of each of the current-carrying elements 3A and 3B are positioned close to the outer surface of the cooling element 2. Moreover, because the relatively heavy cooling element 2 is positioned between the pair of current-carrying elements 3A and 3B, the center of gravity of the electrical junction box 1 is located at the center of the electrical junction box 1. As a result, the overall stability of the electrical junction box 1 is improved.

[0028] <Effects and Actions> As described above, according to the electrical junction box 1 of this embodiment, a pair of current-carrying elements 3A and 3B, each having a relay 30, a fuse 40, and a busbar 50, are arranged such that the outer surfaces of the mounting walls 21 of the current-carrying elements 3A and 3B, on which the busbar 50 is provided, face the outer surface of the cooling element 2, and sandwich the cooling element 2. As a result, when energized, the Joule heat generated in the internal circuit of the relay 30 (especially the movable contact 32 and coil 33), the contacts between the relay 30 and fuse 40 and the busbar 50, and the busbar 50 itself is easily absorbed by the cooling element 2. Furthermore, since the pair of current-carrying elements 3A and 3B are arranged to sandwich the cooling element 2, the heat absorption capacity of the cooling element 2 can be utilized more efficiently than when only one outer surface of the cooling element 2 is used for heat absorption. Thus, the electrical junction box 1 of this embodiment has excellent heat dissipation properties.

[0029] Furthermore, compared to the case where the pair of current-carrying elements 3A and 3B are arranged side by side on one outer surface of the cooling element 2, the size of the cooling element 2 can be reduced, thus enabling miniaturization and cost reduction of the electrical junction box 1.

[0030] Furthermore, the electrical junction box 1 is used in a position where the outer surface of the heat-absorbing cooling body 2 and the mounting wall 21 of the current-carrying bodies 3A and 3B extend vertically. As a result, inside the relay 30 connected to the busbar 50, the terminal 31 and the movable contact 32 are positioned in a direction that intersects the vertical (front-to-back direction). Therefore, even if a component (e.g., a coil 33) around the movable contact 32 falls off due to aging or excessive external force, the component will fall downward in the vertical direction, thus preventing it from interfering with the switching between conductivity and non-conductivity between the movable contact 32 and the terminal 31.

[0031] Furthermore, the heat transfer paste 70, which is positioned to pass through the through-holes 23 in the housing portions 20 of the current-carrying elements 3A and 3B, comes into contact with both the cooling element 2 and the busbar 50. This allows the Joule heat generated at the contact points between the relay 30 and fuse 40 and the busbar 50, as well as the busbar 50 itself, to be efficiently transferred to the cooling element 2 via the heat transfer paste 70. Therefore, the electrical junction box 1 according to this embodiment has even better heat dissipation.

[0032] Furthermore, multiple bolts 4 and nuts 5 fix the pair of energizing elements 3A and 3B together by applying external force to bring them closer to each other. This allows the mounting walls 21 of the housing portion 20 of the energizing elements 3A and 3B to remain close to the outer surface of the cooling body 2, thereby maintaining excellent heat dissipation over a long period of time.

[0033] <Other forms> It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the embodiments described above, and can be modified, improved, etc. as appropriate. Furthermore, 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.

[0034] Here, the features of the embodiment of the electrical junction box 1 described above are briefly summarized and listed below in [1] to [3].

[0035] [1] An electrical junction box (1) comprising a cooling body (2) capable of absorbing heat from its outer surface and dissipating heat to the outside, and a pair of current-carrying bodies (3A, 3B) arranged so as to sandwich the cooling body (2), Each of the pair of current-carrying elements (3A, 3B) is The device comprises a box-shaped housing (20), electronic components (30, 40) arranged inside the housing (20), and a busbar (50) provided on a mounting wall (21) which is one of the box walls of the housing (20) and to which the electronic components (30, 40) are electrically connected, wherein the outer surface of the mounting wall (21) is positioned to face the outer surface of the cooling body (2). The aforementioned electronic component (30) is The electronic component (30) has a plurality of terminals (31) provided on its side wall and connected to the busbar (50), and a movable contact (32) provided inside the electronic component (30) that can mechanically switch between conductivity and non-conductivity between predetermined terminals (31) among the plurality of terminals (31), and is configured such that the movable contact (32) is located further from the side wall than the plurality of terminals (31) inside the electronic component (30). Electrical junction box (1).

[0036] In the electrical junction box with the configuration described in [1] above, a pair of current-carrying bodies containing electronic components and busbars are arranged so that the outer surfaces of the mounting walls of each of these current-carrying bodies face the outer surface of the cooling body, sandwiching the cooling body. As a result, the Joule heat generated when current is applied to the internal circuitry of the electronic components, the contact points between the electronic components and busbars, and the busbars themselves is easily absorbed by the cooling body via the mounting walls. Furthermore, because the pair of current-carrying bodies are arranged to sandwich the cooling body, the heat absorption capacity of the cooling body can be utilized more efficiently compared to the case where only one outer surface of the cooling body is used for heat absorption. Thus, the electrical junction box with this configuration has excellent heat dissipation properties.

[0037] Furthermore, compared to simply arranging a pair of current-carrying elements side by side on one outer surface of the cooling element, the size of the cooling element can be reduced, thus enabling miniaturization and cost reduction of the electrical junction box. In addition, when the electrical junction box is used in a orientation where the outer surface of the cooling element and the mounting wall of the current-carrying elements extend vertically (up and down), the terminals and movable contacts inside the electronic components connected to the busbar will be arranged so as to be aligned in a direction that intersects the vertical direction (for example, horizontally). Therefore, even if components around the movable contacts fall off due to reasons such as aging deterioration or excessive external force, those components will fall downward in the vertical direction, thus preventing them from interfering with the switching between conductivity and non-conductivity between the movable contacts and the terminals.

[0038] [2] The electrical junction box (1) described above [1], The system further includes a heat transfer member (70) that transfers heat between the cooling body (2) and each of the pair of current-carrying bodies (3A, 3B), Each of the housing portions (20) of the pair of energizing bodies (3A, 3B) is, The aforementioned mounting wall (21) has a through hole (23) that penetrates to the inside and outside, The heat transfer member (70) is It is positioned to pass through the through hole (23) and contact both the cooling body (2) and the busbar (50) provided on the mounting wall (21), Electrical junction box (1).

[0039] In the electrical junction box configuration described in [2] above, the heat transfer member, positioned to pass through the through-holes in the housing of the current-carrying body, makes contact with both the cooling body and the busbar. This allows Joule heat generated in the internal circuitry of the electronic component, at the contact points between the electronic component and the busbar, and in the busbar itself to be efficiently transferred to the cooling body via the heat transfer member. Therefore, the electrical junction box configuration described above offers even better heat dissipation.

[0040] [3] The electrical junction box (1) described above [1], The system further includes fastening members (4, 5) that fix the pair of energizing elements (3A, 3B) while applying an external force to bring them closer together. Electrical junction box (1).

[0041] According to the electrical junction box configuration described in [3] above, the fastening member fixes the pair of current-carrying bodies by applying an external force to bring them closer together. This maintains a state in which the mounting walls of the housing portion of the current-carrying bodies are positioned close to the outer surface of the cooling body, thereby enabling excellent heat dissipation to be maintained over a long period of time. [Explanation of symbols]

[0042] 1. Electrical junction box 2 Cooling elements 3A current carrying body 3B Current carrying body 4 bolts (fastening members) 5. Nut (fastening component) 20. Enclosure 21 Implementation challenges 23 Through hole 30 Relays (Electronic Components) 31 terminals 32 Movable contact 40 Fuses (electronic components) 50 Busba 70 Heat transfer paste (heat transfer component)

Claims

1. An electrical connection box comprising a cooling body capable of absorbing heat from its outer surface and dissipating heat to the outside, a pair of current-carrying bodies arranged so as to sandwich the cooling body, and a heat transfer member that transfers heat between the cooling body and each of the pair of current-carrying bodies, Each of the pair of current-carrying bodies is The device comprises a box-shaped housing, electronic components arranged inside the housing, and a busbar provided on one of the housing's box walls, which is a mounting wall, to which the electronic components are electrically connected, and the outer surface of the mounting wall is positioned to face the outer surface of the cooling body. The aforementioned electronic component is The electronic component has a plurality of terminals provided on its side wall and connected to the busbar, and a movable contact provided inside the electronic component that can mechanically switch between conductivity and non-conductivity between predetermined terminals among the plurality of terminals, and is configured such that the movable contact is located further from the side wall than the plurality of terminals inside the electronic component. Each of the housing portions of the pair of current-carrying bodies is The aforementioned mounting wall has through holes that penetrate to the inside and outside, The heat transfer member is It is positioned to pass through the through hole and contact both the cooling body and the busbar provided on the mounting wall, Electrical junction box.

2. An electrical junction box according to claim 1, The system further includes a fastening member that fixes the pair of energized bodies while applying an external force to cause the pair of energized bodies to move closer to each other. Electrical junction box.

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