Electric connection 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 junction 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 to sandwich the cooling body. [Background technology]

[0002] Conventionally, there have been proposed electrical junction boxes to be mounted on vehicles, etc. For example, one conventional electrical junction box has an overall box-like shape and includes a bus bar to be connected to an external power source, etc., electronic components such as relays and fuses 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] Patent Publication No. 2022-047797 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned type of electrical junction box, generally, when an electronic component (particularly a relay or fuse) is operated, Joule heat is generated due to the passage of current in the internal circuit of the electronic component, bus bar, etc. From the viewpoint of operating the electronic component properly for a long period of time, it is desirable to efficiently dissipate the heat generated at various points during the passage of current to the outside.

[0005] An object of the present invention is to provide an electrical junction box having excellent heat dissipation properties. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the electrical junction box according to the present invention has the following features.

[0007] An electric connection box including a first cooling body and a second cooling body capable of absorbing heat from an outer surface and radiating heat to the outside, and a current-carrying body disposed so as to be sandwiched between the first cooling body and the second cooling body, The current-carrying body is a housing having a box shape, electronic components arranged inside the housing, and bus bars provided on two box walls of the housing, a first mounting wall and a second mounting wall, to which the electronic components are electrically connected, the housing being arranged such that an outer surface of the first mounting wall faces the outer surface of the first cooling body and an outer surface of the second mounting wall faces the outer surface of the second cooling body, The electronic component includes: a plurality of terminals provided on a side wall of the electronic component and connected to the bus bar; and a movable contact provided inside the electronic component and capable of mechanically switching electrical continuity or non-conduction between predetermined terminals among the plurality of terminals, the movable contact being located farther from the side wall inside the electronic component than the plurality of terminals. It is an electrical junction box. Effect of the Invention

[0008] According to the electrical junction box of the present invention, the current conductor incorporating the electronic component and the bus bar is arranged so that the outer surfaces of the first mounting wall and the second mounting wall of the current conductor on which the bus bar is provided face the outer surfaces of the first cooling body and the second cooling body, respectively, and is sandwiched between the first cooling body and the second cooling body. This allows Joule heat generated when current is passed through the internal circuit of the electronic component, the contact point between the electronic component and the bus bar, and the bus bar itself to be easily absorbed by the first cooling body and the second cooling body via the mounting walls. Furthermore, since the current conductor is arranged so as to be sandwiched between the first cooling body and the second cooling body, the overall heat absorption capacity of the electrical junction box can be improved compared to a case in which only one cooling body is used for heat absorption. In this way, the electrical junction box of this configuration has excellent heat dissipation properties.

[0009] Furthermore, when the electrical connection box is used in a position in which the outer surface of the first cooling body that absorbs heat and the first mounting wall of the current-carrying body extend in the vertical direction (up and down), the terminals and the movable contacts are arranged inside the electronic components connected to the bus bar provided on the first mounting wall so as to be aligned in a direction intersecting the vertical direction (for example, horizontal direction). Therefore, even if a component around the movable contact falls off due to aging or excessive external force, the component falls downward in the vertical direction, and therefore it is possible to prevent the component from interfering with switching between electrical continuity and non-conduction between the movable contact and the terminal. The same applies to the bus bar 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 reading the following description of the embodiment of the present invention (hereinafter, referred to as "embodiment") with reference to the accompanying drawings. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing an electrical junction box according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a top view of the electrical junction box shown in FIG. 1, seen through the housing of the current-carrying body. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, seen through the housing of the current-carrying body. [Figure 4] 4 is a cross-sectional view taken along a horizontal plane around the relay of the electric junction box shown in FIG. 1, seen through the inside of the relay arranged inside the housing of the current-carrying body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Embodiment> Hereinafter, an electric junction box 1 according to an embodiment of the present invention will be described with reference to the drawings. The electric junction box 1 is typically mounted on a vehicle for use. Examples of the electric junction box 1 include, but are not limited to, a junction box and a relay box. As shown in FIG. 1 and other figures, the electric junction box 1 includes a pair of cooling bodies 2A, 2B and a current-carrying body 3 arranged to be sandwiched between the pair of cooling bodies 2A, 2B. The pair of cooling bodies 2A, 2B and the current-carrying body 3 are fixed to each other by fastening with a bolt 4.

[0013] For ease of explanation, the "front-rear direction", "left-right direction" and "up-down direction" are defined below as shown in Figs. 1 to 4. The "front-rear direction", "left-right direction" and "up-down direction" are mutually perpendicular. 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 merely for ease of explanation, and do not necessarily correspond to the front-rear direction and left-right direction of the vehicle when the electrical junction box 1 is mounted on the vehicle. Each component that constitutes the electrical junction box 1 will be described below in order.

[0014] First, the pair of cooling bodies 2A, 2B will be described. As shown in Fig. 1 and Fig. 2, the pair of cooling bodies 2A, 2B have the same outer shape and the same structure. The pair of cooling bodies 2A, 2B are arranged so as to sandwich the current-carrying body 3 in the front-rear direction with their orientations reversed (flange portions 13, described below, facing each other in the front-rear direction). Only the cooling body 2A of the pair of cooling bodies 2A, 2B will be described below, and a description of the cooling body 2B will be omitted.

[0015] As shown in FIG. 1 and FIG. 2, the cooling body 2A has a rectangular parallelepiped body 10 that extends in the left-right direction and the up-down direction and is thin in the front-rear direction. The 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 body 10 are provided on the right end side wall of the body 10, and the inlet passage 11 and the outlet passage 12 are connected to a heat radiator (not shown) located outside the cooling body 2A. The cooling water cooled by the radiator is introduced into the inside of the body 10 through the inlet passage 11 by a pump (not shown) or the like, and absorbs heat from the outside through the outer wall of the body 10. The cooling water that has absorbed the heat (heated) is returned from the inside of the body 10 through the outlet passage 12 to the radiator and is cooled again. By repeating such a cycle, the cooling body 2A fulfills the function of absorbing heat from the outer surface of the body 10 and radiating heat to the outside. In addition, among the outer walls of the main body 10, only the rear end side wall that faces the current-carrying body 3 to be cooled may be made of metal with excellent thermal conductivity, and the other outer walls may be made of low-cost, lightweight resin.

[0016] A pair of left and right flanges 13 are provided on the main body 10 so as to extend continuously from the rear end side wall outward in both the left and right directions. The flanges 13 are provided with a plurality of through holes (not shown) arranged in the vertical direction for inserting the bolts 4 therethrough. The flanges 13 are used for the above-mentioned fastening using the bolts 4.

[0017] Next, a description will be given of the electric conductor 3. As shown in Fig. 1 to Fig. 3, the electric conductor 3 has a box-shaped housing 20, a plurality of relays 30 and fuses 40 arranged inside the housing 20, and a plurality of bus bars 50 provided on mounting walls 21A and 21B, which are two box walls of the housing 20, and electrically connected to the plurality of relays 30 and fuses 40.

[0018] The housing 20 has a rectangular parallelepiped box shape that extends in the left-right and up-down directions and is thick in the front-rear direction. The housing 20 is made of, for example, resin. A front end side wall of the housing 20 (a rectangular flat wall extending in the left-right and up-down directions that is disposed opposite the rear end side wall of the cooling body 2A) functions as a mounting wall 21A on which the bus bar 50 is provided, and a rear end side wall of the housing 20 (a rectangular flat wall extending in the left-right and up-down directions that is disposed opposite the front end side wall of the cooling body 2B) functions as a mounting wall 21B on which the bus bar 50 is provided (see Figs. 2 and 4). A plurality of through holes 23 penetrating each of the mounting walls 21A and 21B from inside to outside are formed in the portions of the mounting walls 21A and 21B on which the bus bar 50 is provided (see Fig. 4). The effect of providing such through holes 23 will be described later.

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

[0020] Hereinafter, the internal structure of the relay 30 and the connection structure between the relay 30 and the pair of bus bars 50 will be briefly described with reference to Fig. 4. The relay 30 includes a pair of metal terminals 31 provided so as to protrude from one side wall (front end side wall) of the housing of the relay 30 to the outside, a metal movable contact 32 provided inside the housing of the relay 30 and capable of mechanically switching between electrical continuity and non-conductivity between the multiple 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 disposed between a core 34 of the coil 33 and the movable contact 32. The contact spring 35 constantly biases the movable contact 32 to the conductive side (front side). When electricity is applied to the coil 33, the coil 33 exerts an attractive force that drives the movable contact 32 to the non-conductive side (rear side) against the biasing force of the contact spring 35. As described above, the relay 30 can mechanically switch between electrical continuity and non-conduction between the multiple terminals 31 by switching between electrical continuity and non-conduction to the coil 33. In this manner, the movable contact 32 is located farther away (at a rear position) from one side wall (front end side wall) of the housing of the relay 30 than the multiple terminals 31, and the multiple terminals 31 and the movable contact 32 are located so as to be aligned in the front-rear direction. Therefore, even if a part (e.g., the coil 33) around the movable contact 32 falls off due to aging or excessive external force, the part falls downward in the vertical direction, and therefore it is possible to prevent the part from interfering with the switching between electrical continuity and non-conduction between the movable contact 32 and the multiple terminals 31.

[0021] Each of the multiple terminals 31 of the relay 30 is fastened to the corresponding bus bar 50 by a metal nut 51 in a recess of each of the corresponding pair of bus bars 50. In this way, 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. Each of the components that make up the electrical junction box 1 has been described above.

[0022] Next, the assembly of the electric connection box 1 will be described. To assemble the electric connection box 1, as shown in FIG. 1, the cooling bodies 2A and 2B are arranged on the front and rear sides of the electric conductor 3 so that the cooling bodies 2A and 2B sandwich the electric conductor 3 in the front-rear direction. Next, a paste-like heat transfer paste 70 having excellent heat transfer properties is filled in the gap between the outer surface of the mounting wall 21A of the electric conductor 3 facing each other and the outer surface of the main body 10 of the cooling body 2A (see FIG. 4), and in the gap between the outer surface of the mounting wall 21B of the electric conductor 3 facing each other and the outer surface of the main body 10 of the cooling body 2B. Next, the electric conductor 3 and the pair of cooling bodies 2A and 2B are fastened and fixed using a plurality of bolts 4 inserted into through holes (not shown) provided in the flange parts 13 of the pair of cooling bodies 2A and 2B. This completes the assembly of the electric connection box 1, and the electric connection box 1 shown in FIG. 1 is obtained.

[0023] 2 and 4, in the assembled state of the electrical junction box 1, the current conductor 3 is arranged so that the outer surfaces of the mounting walls 21A and 21B on which the bus bar 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, Joule heat generated in the internal circuit of the relay 30 (particularly the movable contact 32 and the coil 33), the contacts between the relay 30 and the fuse 40 and the bus bar 50, and the bus bar 50 itself when the current conductor 3 is applied 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, since the current conductor 3 is arranged so as to be 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 the case where only one cooling body is used for heat absorption.

[0024] Furthermore, in the assembled state of the electrical connection box 1, as shown in Fig. 4, a part of the heat transfer paste 70 arranged in the gap between the outer surface of the mounting wall 21A facing each other and the outer surface of the main body part 10 of the cooling body 2A passes through a plurality of through holes 23 provided in the mounting wall 21A, spreads to the inner surface side of the mounting wall 21A, and contacts the bus bar 50 facing the inner surface of the mounting wall 21A (see Fig. 4). Similarly, a part of the heat transfer paste 70 arranged in the gap between the outer surface of the mounting wall 21B facing each other and the outer surface of the main body part 10 of the cooling body 2B passes through a plurality of through holes 23 provided in the mounting wall 21B, spreads to the inner surface side of the mounting wall 21B, and contacts the bus bar 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 bus bar 50 through the through holes 23. This allows the Joule heat generated in the internal circuit of the relay 30 (particularly the movable contact 32 and the coil 33), the contacts between the relay 30 and the fuse 40 and the bus bar 50, and the bus bar 50 itself to be efficiently transferred to the cooling bodies 2A and 2B via the heat transfer paste 70.

[0025] Furthermore, in the assembled state of the electrical junction box 1, the bolts 4 fix the current conductor 3 and the cooling body 2A while applying an external force so that the current conductor 3 and the cooling body 2A approach each other, and fix the current conductor 3 and the cooling body 2B while applying an external force so that the current conductor 3 and the cooling body 2B approach each other. This makes it possible to maintain a state in which each of the mounting walls 21A, 21B of the housing part 20 of the current conductor 3 is disposed close to the outer surfaces of each of the cooling bodies 2A, 2B.

[0026] <Actions and Effects> As described above, according to the electric junction box 1 of the present embodiment, the electric conductor 3 having the relay 30, the fuse 40, and the bus bar 50 is arranged so that the outer surfaces of the mounting walls 21A, 21B of the electric conductor 3 on which the bus bar 50 is provided face the outer surfaces of the cooling bodies 2A, 2B, and is sandwiched between the cooling bodies 2A, 2B. As a result, Joule heat generated in the internal circuit of the relay 30 (particularly the movable contact 32 and the coil 33), the contacts between the relay 30 and the fuse 40 and the bus bar 50, and the bus bar 50 itself during energization is easily absorbed by the cooling bodies 2A, 2B. Furthermore, since the electric conductor 3 is arranged so as to be sandwiched between the cooling bodies 2A, 2B, the overall heat absorption capacity of the electric junction box 1 can be improved compared to the case where only one cooling body is used for heat absorption. Thus, the electric junction box 1 of the present embodiment has excellent heat dissipation properties.

[0027] Furthermore, the electrical connection box 1 is used in a position in which the outer surface of the cooling body 2A that absorbs heat and the mounting wall 21A of the current-carrying body 3 extend in the vertical direction. As a result, inside the relay 30 connected to the bus bar 50 provided on the mounting wall 21A, the terminal 31 and the movable contact 32 are positioned so as to be aligned in a direction intersecting the vertical direction (for example, the front-rear direction). Therefore, even if a component (for example, the coil 33) around the movable contact 32 falls off due to aging deterioration or excessive external force, the component falls downward in the vertical direction, so that it is possible to prevent the component from interfering with switching between electrical continuity and non-conduction between the movable contact 32 and the terminal 31. The same applies to the bus bar 50 provided on the mounting wall 21B.

[0028] Furthermore, the heat transfer paste 70, which is arranged so as to pass through the through hole 23 of the housing 20 of the current conductor 3, contacts both the cooling bodies 2A, 2B and the bus bar 50. This allows Joule heat generated in the internal circuit of the relay 30 (particularly the movable contact 32 and the coil 33), the contacts between the relay 30 and the fuse 40 and the bus bar 50, and the bus bar 50 itself to be efficiently transferred to the cooling bodies 2A, 2B via the heat transfer paste 70. Therefore, the electrical junction box 1 according to this embodiment has even better heat dissipation properties.

[0029] Furthermore, the bolts 4 fix the conductor 3 and the cooling body 2A while applying an external force so that the conductor 3 and the cooling body 2A approach each other, and fix the conductor 3 and the cooling body 2B while applying an external force so that the conductor 3 and the cooling body 2B approach each other. This makes it possible to maintain a state in which the mounting walls 21A, 21B of the housing part 20 of the conductor 3 are each disposed close to the outer surfaces of the cooling bodies 2A, 2B, respectively, and therefore makes it possible to maintain excellent heat dissipation performance for a long period of time.

[0030] <Other forms> The present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and appropriate modifications, improvements, etc. are possible. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiments are arbitrary as long as the present invention can be achieved, and are not limited.

[0031] Here, the features of the embodiment of the electric junction box 1 described above will be briefly summarized and listed in the following [1] to [3].

[0032] [1] An electric connection box (1) comprising a first cooling body (2A) and a second cooling body (2B) capable of absorbing heat from an outer surface and radiating heat to the outside, and an electric conductor (3) disposed so as to be sandwiched between the first cooling body (2A) and the second cooling body (2B), The current conductor (3) is the electronic component (30, 40) is disposed inside the housing (20); and a bus bar (50) provided on a first mounting wall (21A) and a second mounting wall (21B) which are two box walls of the housing (20) and to which the electronic component (30, 40) is electrically connected, the electronic component (30, 40) being disposed such that an outer surface of the first mounting wall (21A) faces the outer surface of the first cooling body (2A) and an outer surface of the second mounting wall (21B) faces the outer surface of the second cooling body (2B); The electronic component (30) is the electronic component (30) has a plurality of terminals (31) provided on a side wall of the electronic component (30) and connected to the bus bar (50); and a movable contact (32) provided inside the electronic component (30) and capable of mechanically switching electrical continuity or non-conduction between predetermined terminals among the plurality of terminals (31), and the movable contact (32) is located farther from the side wall inside the electronic component (30) than the plurality of terminals (31). Electrical junction box(1).

[0033] According to the electrical connection box of the configuration [1] above, the current-carrying body incorporating the electronic component and the bus bar is arranged so that the outer surfaces of the first mounting wall and the second mounting wall of the current-carrying body on which the bus bar is provided face the outer surfaces of the first cooling body and the second cooling body, and the current-carrying body is sandwiched between the first cooling body and the second cooling body. This allows Joule heat generated when current is applied to the internal circuit of the electronic component, the contact point between the electronic component and the bus bar, and the bus bar itself to be easily absorbed by the first cooling body and the second cooling body through the mounting walls. Furthermore, since the current-carrying body is arranged so as to be sandwiched between the first cooling body and the second cooling body, the overall heat absorption capacity of the electrical connection box can be improved compared to when only one cooling body is used for heat absorption. In this way, the electrical connection box of this configuration has excellent heat dissipation properties.

[0034] Furthermore, when the electrical connection box is used in a position in which the outer surface of the first cooling body that absorbs heat and the first mounting wall of the current-carrying body extend in the vertical direction (up and down), the terminals and the movable contacts are arranged inside the electronic components connected to the bus bar provided on the first mounting wall so as to be aligned in a direction intersecting the vertical direction (for example, horizontal direction). Therefore, even if a component around the movable contact falls off due to aging or excessive external force, the component falls downward in the vertical direction, and therefore it is possible to prevent the component from interfering with switching between electrical continuity and non-conduction between the movable contact and the terminal. The same applies to the bus bar provided on the second mounting wall.

[0035] [2] The electrical connection box (1) according to the above [1], the cooling device further includes a first heat transfer member (70) for transferring heat between the first cooling body (2A) and the current conductor (3), and a second heat transfer member (70) for transferring heat between the second cooling body (2B) and the current conductor (3), The housing portion (20) is a first through hole (23) penetrating the first mounting wall (21A) from inside to outside, and a second through hole (23) penetrating the second mounting wall (21B) from inside to outside, The first heat transfer member (70) is the first through-hole (23) is disposed so as to come into contact with both the first cooling body (2A) and the bus bar (50) provided on the first mounting wall (21A); The second heat transfer member (70) is The heat exchanger (10) is disposed so as to pass through the second through hole (23) and come into contact with both the second cooling body (2B) and the bus bar (50) provided on the second mounting wall (21B). Electrical junction box(1).

[0036] According to the electrical junction box having the configuration [2] above, the first heat transfer member, which is arranged to pass through the first through hole of the housing of the current-carrying body, contacts both the first cooling body and the bus bar. This allows Joule heat generated at the contact point between the electronic component and the bus bar and at the bus bar itself to be efficiently transferred to the cooling body via the heat transfer member. The same is true for the second heat transfer member. Therefore, the electrical junction box having this configuration has even better heat dissipation properties.

[0037] [3] The electrical connection box (1) according to the above [1], the cooling body (2A) is brought closer to each other while exerting an external force; and the cooling body (2B) is brought closer to each other while exerting an external force. Electrical junction box(1).

[0038] According to the electrical junction box having the configuration of [3] above, the first fastening member fixes the electric conductor and the first cooling body while applying an external force so that the electric conductor and the first cooling body approach each other. The same is true for the second fastening member. This allows the first mounting wall and the second mounting wall of the housing of the electric conductor to be maintained in close proximity to the outer surfaces of the first cooling body and the second mounting wall, respectively, so that excellent heat dissipation properties can be maintained for 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 Housing 21A Mounting wall (first mounting wall) 21B Mounting wall (second mounting wall) 23 Through hole (first through hole, second through hole) 30 Relay (electronic component) 31 Terminal 32 Movable contact 40 Fuse (electronic component) 50 Bus Bar 70 Heat transfer paste (first heat transfer member, second heat transfer member)

Claims

1. An electrical connection box including a first cooling body and a second cooling body capable of absorbing heat from an outer surface and radiating heat to the outside, and a current-carrying body disposed so as to be sandwiched between the first cooling body and the second cooling body, The current conductor is a housing having a box shape, electronic components arranged inside the housing, and bus bars provided on two box walls of the housing, a first mounting wall and a second mounting wall, to which the electronic components are electrically connected, the housing being arranged such that an outer surface of the first mounting wall faces the outer surface of the first cooling body and an outer surface of the second mounting wall faces the outer surface of the second cooling body, The electronic component includes: a plurality of terminals provided on a side wall of the electronic component and connected to the bus bar; and a movable contact provided inside the electronic component and capable of mechanically switching electrical continuity or non-conduction between predetermined terminals among the plurality of terminals, the movable contact being located farther from the side wall inside the electronic component than the plurality of terminals. Electrical junction box.

2. 2. The electrical connection box according to claim 1, a first heat transfer member that transfers heat between the first cooling body and the current conductor, and a second heat transfer member that transfers heat between the second cooling body and the current conductor, The housing part is a first through hole penetrating the first mounting wall from inside to outside, and a second through hole penetrating the second mounting wall from inside to outside, The first heat transfer member is the first through hole is disposed so as to come into contact with both the first cooling body and the bus bar provided on the first mounting wall; The second heat transfer member is the second through hole and is disposed so as to come into contact with both the second cooling body and the bus bar provided on the second mounting wall. Electrical junction box.

3. 2. The electrical connection box according to claim 1, a first fastening member that fastens the current conductor and the first cooling body while applying an external force so that the current conductor and the first cooling body approach each other, and a second fastening member that fastens the current conductor and the second cooling body while applying an external force so that the current conductor and the second cooling body approach each other, Electrical junction box.

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