Electrical junction box

Abstract

To provide an electric connection box having excellent heat dissipation properties.SOLUTION: An electrical connection box 1 includes first and second cooling bodies 2A, 2B, and an electric conductor 3 arranged to be sandwiched between the first and second cooling bodies 2A, 2B. The electric conductor 3 includes a housing portion 20, electronic components 30, 40 arranged in the housing 20, and a bus bar 50 that is provided on the first and second mounting walls 21A, 21B, which are the two box walls of the housing 20, and electrically connected to the electronic components 30 and 40. The outer surface of each of the first and second mounting walls 21A and 21B and the outer surface of each of the first and second cooling bodies 2A, 2B are arranged to face each other. The electronic component 30 includes a plurality of terminals 31 that are provided on the side walls 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 switching between electrical conductivity and non-conductivity between the plurality of terminals 31. The movable contact 32 is located to be farther from the side walls than the plurality of terminals 31.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 the 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 of the conventional electrical connection boxes has a box-shaped overall shape, and includes a bus bar connected to an external power source or the like, electronic components such as a relay and a fuse connected to the bus bar, and a case that houses 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 an electronic component (particularly, a relay or a fuse) operates, joule heat due to energization occurs in the internal circuit of the electronic component, the bus bar, or the like. From the viewpoint of properly operating the electronic component over a long period of time, it is desirable to efficiently radiate the heat generated各处 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 junction box comprising a first cooling element and a second cooling element capable of absorbing heat from their outer surfaces and dissipating heat to the outside, and a current-carrying element positioned between the first cooling element and the second cooling element, The current-carrying body is The device comprises a box-shaped housing, electronic components arranged inside the housing, and busbars provided on the two box walls of the housing, a first mounting wall and a second mounting wall, to which the electronic components are electrically connected, wherein the outer surface of the first mounting wall faces the outer surface of the first cooling body and the outer surface of the second mounting wall faces the outer surface of the second 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] According to the electrical junction box of the present invention, the current-carrying body containing electronic components and busbars is arranged such that the outer surfaces of the first mounting wall and the second mounting wall of the current-carrying body on which the busbars are provided face the outer surfaces of the first and second cooling bodies, respectively, and the current-carrying body is sandwiched between the first and second cooling bodies. 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 the busbars, and the busbars themselves is easily absorbed by the first and second cooling bodies through each mounting wall. Furthermore, because the current-carrying body is arranged sandwiched between the first and second cooling bodies, the overall heat absorption capacity of the electrical junction box can be improved compared to the case where only one cooling body is used for heat absorption. Thus, the electrical junction box with this configuration has excellent heat dissipation properties.

[0009] Furthermore, when using an electrical junction box in an orientation where the outer surface of the first cooling body that absorbs heat as described above and the first mounting wall of the current-carrying body extend vertically (up and down), the terminals and movable contacts inside the electronic components connected to the busbar provided on the first mounting wall 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. The same applies to the busbar provided on the second mounting wall.

[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 cross-sectional view of Figure 2, AA, showing the housing portion of the conductive element through the glass. [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 embodiment of the electrical junction box 1 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 pair of cooling bodies 2A and 2B, and a current-carrying body 3 positioned between the pair of cooling bodies 2A and 2B. The pair of cooling bodies 2A and 2B and the current-carrying body 3 are fixed to each other by fastening with bolts 4.

[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 pair of coolers 2A and 2B. As shown in Figures 1 and 2, the pair of coolers 2A and 2B have the same external shape and structure. The pair of coolers 2A and 2B are positioned so as to sandwich the energizing body 3 in the front-to-back direction, with their front-to-back orientations reversed (the flange portions 13 of each cooler, described later, facing each other in the front-to-back direction). Below, only cooler 2A of the pair of coolers 2A and 2B will be described, and the description of cooler 2B will be omitted.

[0015] As shown in Figures 1 and 2, the cooling body 2A 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 2A. 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) or the like, 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 to the heat sink via the outlet passage 12 and cooled again. By repeating this cycle, the cooling body 2A performs the function of absorbing heat from the outer surface of the main body 10 and dissipating heat to the outside. Furthermore, of the outer walls of the main body 10, only the rear end side wall that faces the conductive element 3 to be cooled may be made of a metal with excellent heat conductivity, while the other outer walls may be made of low-cost and lightweight resin.

[0016] The main body 10 is provided with a pair of left and right flange portions 13 that extend continuously outward from the rear end side wall in the left-right direction. The flange portions 13 are provided with a plurality of through holes (not shown) arranged vertically for inserting bolts 4. The flange portions 13 are the parts used for the fastening described above using bolts 4.

[0017] Next, the energizing body 3 will be described. As shown in Figures 1 to 3, the energizing body 3 has 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 the mounting walls 21A and 21B, which are the two box walls of the housing 20, and which are electrically connected to the plurality of relays 30 and fuses 40.

[0018] The housing part 20 has a rectangular parallelepiped box shape that extends in the left - right direction and the up - down direction and is thick in the front - rear direction. The housing part 20 is, for example, made of resin. The front end side wall of the housing part 20 (a rectangular flat plate - shaped wall that extends in the left - right direction and the up - down direction and is arranged to face the rear end side wall of the cooling body 2A) functions as a mounting wall 21A where the bus bar 50 is provided, and the rear end side wall of the housing part 20 (a rectangular flat plate - shaped wall that extends in the left - right direction and the up - down direction and is arranged to face the front end side wall of the cooling body 2B) functions as a mounting wall 21B where the bus bar 50 is provided (see FIGS. 2 and 4). At the portions where the bus bar 50 is provided on each of the mounting walls 21A and 21B, a plurality of through - holes 23 that penetrate the mounting walls 21A and 21B inside and outside are formed (see FIG. 4). The effect of providing such through - holes 23 will be described later.

[0019] Inside the housing part 20, as shown in FIG. 2, two relays 30 are arranged side by side in the left - right direction along the inner surface of the mounting wall 21A in the vicinity of the inner surface of the mounting wall 21A, and two relays 30 and one fuse 40 are arranged side by side in the left - right direction along the inner surface of the mounting wall 21B in the vicinity of the inner surface of the mounting wall 21B. The relay 30 is a component that performs a switch function of turning on and off the energization, and the fuse 40 is a component that performs a fuse function of turning off the energization when a current exceeding the rating flows. On each of the mounting walls 21A and 21B, a plurality of flat - plate - shaped bus bars 50 are provided so as to face the inner surfaces of the mounting walls 21A and 21B and be arranged side by side in the left - right direction along the inner surfaces. Specifically, the plurality of bus bars 50 are arranged such that a pair of left - right bus bars 50 corresponding to each of the relay 30 and the fuse 40 are electrically connected. One bus bar 50 provided on the mounting wall 21A and one bus bar 50 provided on the mounting wall 21B are electrically connected by a connecting bus bar 60 provided inside the housing part 20 (see FIG. 2). Note that instead of the connecting bus bar 60, the bus bars 50 may be connected using electric wires.

[0020] Hereinafter, while 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 outward 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 conduction or non-conduction between the plurality of terminals 31, a coil 33 provided inside the housing of the relay 30 and driving the movable contact 32, and a contact spring 35 provided inside the housing of the relay 30 and disposed between the core 34 of the coil 33 and the movable contact 32. The contact spring 35 constantly biases the movable contact 32 toward the conduction side (front side). When the coil 33 is energized, the coil 33 exhibits an attractive force that drives the movable contact 32 toward the non-conduction side (rear side) against the biasing force of the contact spring 35. From the above, the relay 30 can mechanically switch conduction or non-conduction between the plurality of terminals 31 by switching non-energization / energization of the coil 33. Thus, the movable contact 32 is located at a position (rear side position) farther from one side wall (front end side wall) of the housing of the 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 a component (e.g., the coil 33) around the movable contact 32 falls off due to reasons such as aging deterioration or excessive external force, the component will fall downward in the vertical direction, so that it can be avoided that the component hinders 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 the relay 30 is fastened and fixed to the corresponding busbar 50 by a metal nut 51 in the recess of each of the corresponding pair of busbars 50. Thereby, the pair of busbars 50 and the relay 30 are fixed to each other, and the pair of busbars 50 are electrically connected to the relay 30. The above describes each component constituting the electrical connection box 1.

[0022] 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 cooling bodies 2A and 2B are positioned on the front and rear sides of the current-carrying body 3, respectively, so that the cooling bodies 2A and 2B sandwich the current-carrying body 3 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 21A of the current-carrying bodies 3 and the outer surface of the main body portion 10 of the cooling body 2A (see Figure 4), and into the gaps between the outer surfaces of the mounting walls 21B of the current-carrying bodies 3 and the outer surface of the main body portion 10 of the cooling body 2B. Next, the current-carrying body 3 and the pair of cooling bodies 2A and 2B are fastened and fixed together using a plurality of bolts 4 inserted through through holes (not shown) provided in the flange portions 13 of the pair of cooling bodies 2A and 2B. This completes the assembly of the electrical junction box 1, and the electrical junction box 1 shown in Figure 1 is obtained.

[0023] In the assembled state of the electrical junction box 1, as shown in Figures 2 and 4, the current-carrying body 3 is positioned such that the outer surfaces of the mounting walls 21A and 21B on which the busbar 50 is provided face the outer surfaces of the pair of cooling bodies 2A and 2B, and is sandwiched between the pair of cooling bodies 2A and 2B. As a result, when the current-carrying body 3 is 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 pair of cooling bodies 2A and 2B via the mounting walls 21A and 21B and the heat transfer paste 70. Furthermore, because the current-carrying body 3 is positioned sandwiched between the pair of cooling bodies 2A and 2B, the overall heat absorption capacity of the electrical junction box 1 can be improved compared to when only one cooling body is used for heat absorption.

[0024] Furthermore, in the assembled state of the electrical junction box 1, as shown in Figure 4, a portion of the heat transfer paste 70 placed in the gap between the outer surfaces of the opposing mounting walls 21A and the outer surface of the main body 10 of the cooling body 2A passes through the multiple through holes 23 provided in the mounting wall 21A and spreads to the inner surface of the mounting wall 21A, contacting the busbar 50 facing the inner surface of the mounting wall 21A (see Figure 4). Similarly, a portion of the heat transfer paste 70 placed in the gap between the outer surfaces of the opposing mounting walls 21B and the outer surface of the main body 10 of the cooling body 2B passes through the multiple through holes 23 provided in the mounting wall 21B and spreads to the inner surface of the mounting wall 21B, contacting the busbar 50 facing the inner surface of the mounting wall 21B. In other words, the heat transfer paste 70 is in contact with both the cooling bodies 2A and 2B and the busbar 50 via the through holes 23. This allows the Joule heat generated in the internal circuitry 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 to be efficiently transferred to the coolers 2A and 2B via the heat transfer paste 70.

[0025] Furthermore, in the assembled state of the electrical junction box 1, multiple bolts 4 fix the current-carrying body 3 and the cooling body 2A while applying external force to bring them closer together, and also fix the current-carrying body 3 and the cooling body 2B while applying external force to bring them closer together. This maintains a state in which the mounting walls 21A and 21B of the housing portion 20 of the current-carrying body 3 are positioned close to the respective outer surfaces of the cooling bodies 2A and 2B.

[0026] <Effects and Actions> As described above, according to the electrical junction box 1 of this embodiment, the current-carrying body 3, which has a relay 30, a fuse 40, and a busbar 50, is arranged such that the outer surfaces of the mounting walls 21A and 21B of the current-carrying body 3 on which the busbar 50 is provided face the outer surfaces of the coolers 2A and 2B, and is sandwiched between the coolers 2A and 2B. 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 coolers 2A and 2B. Furthermore, because the current-carrying body 3 is arranged sandwiched between the coolers 2A and 2B, the overall heat absorption capacity of the electrical junction box 1 can be improved compared to the case where only one cooler is used for heat absorption. Thus, the electrical junction box 1 of this embodiment has excellent heat dissipation properties.

[0027] Furthermore, the electrical junction box 1 is used in a position where the outer surface of the heat-absorbing cooling body 2A and the mounting wall 21A of the current-carrying body 3 extend vertically. As a result, inside the relay 30 connected to the busbar 50 provided on the mounting wall 21A, the terminal 31 and the movable contact 32 are positioned in a direction that intersects the vertical direction (for example, the front-to-back direction). Therefore, even if a component (for example, 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. The same applies to the busbar 50 provided on the mounting wall 21B.

[0028] Furthermore, the heat transfer paste 70, which is positioned to pass through the through-hole 23 in the housing portion 20 of the current-carrying body 3, comes into contact with both the cooling bodies 2A and 2B and the busbar 50. As a result, 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 can be efficiently transferred to the cooling bodies 2A and 2B via the heat transfer paste 70. Therefore, the electrical junction box 1 according to this embodiment has even better heat dissipation.

[0029] Furthermore, multiple bolts 4 fix the energizing element 3 and the cooling element 2A while applying external force to bring them closer together, and also fix the energizing element 3 and the cooling element 2B while applying external force to bring them closer together. As a result, the mounting walls 21A and 21B of the housing portion 20 of the energizing element 3 are kept in close proximity to the outer surfaces of the cooling elements 2A and 2B, respectively, thus maintaining excellent heat dissipation over a long period of time.

[0030] <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.

[0031] Here, the features of the embodiment of the electrical junction box 1 described above are briefly summarized and listed below in [1] to [3].

[0032] [1] An electrical junction box (1) comprising a first cooling element (2A) and a second cooling element (2B) capable of absorbing heat from their outer surfaces and dissipating heat to the outside, and a current-carrying element (3) positioned between the first cooling element (2A) and the second cooling element (2B), The energizing element (3) is The device comprises a box-shaped housing (20), electronic components (30, 40) arranged inside the housing (20), and busbars (50) provided on the two box walls of the housing (20), namely the first mounting wall (21A) and the second mounting wall (21B), to which the electronic components (30, 40) are electrically connected, wherein the outer surface of the first mounting wall (21A) faces the outer surface of the first cooling body (2A) and the outer surface of the second mounting wall (21B) faces the outer surface of the second cooling body (2B). 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), 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).

[0033] In the electrical junction box with the configuration described in [1] above, the current-carrying body containing the electronic components and busbars is arranged such that the outer surfaces of the first and second mounting walls of the current-carrying body on which the busbars are provided face the outer surfaces of the first and second cooling bodies, respectively, and the current-carrying body is sandwiched between the first and second cooling bodies. 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 the busbars, and the busbars themselves is easily absorbed by the first and second cooling bodies through each mounting wall. Furthermore, because the current-carrying body is arranged sandwiched between the first and second cooling bodies, the overall heat absorption capacity of the electrical junction box can be improved compared to the case where only one cooling body is used for heat absorption. Thus, the electrical junction box with this configuration has excellent heat dissipation properties.

[0034] Furthermore, when using an electrical junction box in an orientation where the outer surface of the first cooling body that absorbs heat as described above and the first mounting wall of the current-carrying body extend vertically (up and down), the terminals and movable contacts inside the electronic components connected to the busbar provided on the first mounting wall 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. The same applies to the busbar provided on the second mounting wall.

[0035] [2] The electrical junction box (1) described above [1], The system further comprises a first heat transfer member (70) that transfers heat between the first cooler (2A) and the current-carrying body (3), and a second heat transfer member (70) that transfers heat between the second cooler (2B) and the current-carrying body (3), The housing portion (20) is The first mounting wall (21A) has a first through-hole (23) that penetrates to the inside and outside, and the second mounting wall (21B) has a second through-hole (23) that penetrates to the inside and outside, The first heat transfer member (70) is It is positioned to pass through the first through-hole (23) and contact both the first cooling body (2A) and the busbar (50) provided on the first mounting wall (21A), The second heat transfer member (70) is It is positioned to pass through the second through-hole (23) and contact both the second cooling body (2B) and the busbar (50) provided on the second mounting wall (21B), Electrical junction box (1).

[0036] In the electrical junction box with the configuration described in [2] above, the first heat transfer member, which is positioned to pass through the first through-hole in the housing of the current-carrying body, comes into contact with both the first cooler and the busbar. This allows Joule heat generated at the contact points between the electronic components and the busbar, as well as the busbar itself, to be efficiently transferred to the cooler via the heat transfer member. The same applies to the second heat transfer member. Therefore, the electrical junction box with this configuration offers even better heat dissipation.

[0037] [3] The electrical junction box (1) described above [1], The system further comprises: a first fastening member (4) that fixes the energizing element (3) and the first cooling element (2A) while applying an external force that brings them closer together; and a second fastening member (4) that fixes the energizing element (3) and the second cooling element (2B) while applying an external force that brings them closer together. Electrical junction box (1).

[0038] According to the electrical junction box configuration described in [3] above, the first fastening member fixes the current-carrying body and the first cooling body by applying an external force to bring them closer together. The same applies to the second fastening member. As a result, the first mounting wall and the second mounting wall of the housing portion of the current-carrying body are kept in close proximity to the outer surfaces of the first cooling body and the second mounting wall, respectively, thus enabling excellent heat dissipation to be maintained over a long period of time. [Explanation of symbols]

[0039] 1. Electrical junction box 2A Cooling body (1st cooling body) 2B Cooling body (second cooling body) 3. Conductor 4 bolts (fastening members) 20. Enclosure 21A Implementation Wall (First Implementation Wall) 21B Implementation Wall (Second Implementation Wall) 23 Through holes (first through hole, second through hole) 30 Relays (Electronic Components) 31 terminals 32 Movable contact 40 Fuses (electronic components) 50 Busba 70 Heat transfer paste (first heat transfer member, second heat transfer member)

Claims

1. An electrical connection box comprising: a first cooling body and a second cooling body capable of absorbing heat from their outer surfaces and dissipating heat to the outside; a current-carrying body positioned between the first cooling body and the second cooling body; a first heat-transferring member that transfers heat between the first cooling body and the current-carrying body; and a second heat-transferring member that transfers heat between the second cooling body and the current-carrying body, The current-carrying body is The device comprises a box-shaped housing, electronic components arranged inside the housing, and busbars provided on the two box walls of the housing, a first mounting wall and a second mounting wall, to which the electronic components are electrically connected, wherein the outer surface of the first mounting wall faces the outer surface of the first cooling body and the outer surface of the second mounting wall faces the outer surface of the second 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. The aforementioned housing portion is The first mounting wall has a first through-hole that penetrates the inside and outside, and the second mounting wall has a second through-hole that penetrates the inside and outside, The first heat transfer member is It is positioned to pass through the first through-hole and contact both the first cooling body and the busbar provided on the first mounting wall, The second heat transfer member is It is positioned to pass through the second through-hole and contact both the second cooling body and the busbar provided on the second mounting wall, Electrical junction box.

2. An electrical junction box according to claim 1, The system further comprises: a first fastening member for fixing the energizing element and the first cooling element while applying an external force to bring the energizing element and the first cooling element closer together; and a second fastening member for fixing the energizing element and the second cooling element while applying an external force to bring the energizing element and the second cooling element closer together. Electrical junction box.

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