Electric connection 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 junction box including a cooling body capable of absorbing heat from its 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, electrical junction boxes have been proposed for installation in vehicles, etc. For example, one conventional electrical junction box has an overall box-like shape and includes a bus bar 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] Japanese Patent Publication No. 2022-047797 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned types of electrical junction boxes, when electronic components (particularly relays and fuses) are activated, Joule heat is generally generated in the internal circuits, bus bars, etc. of the electronic components. From the viewpoint of ensuring proper operation of electronic components over a long period of time, it is desirable to efficiently dissipate the heat generated in various locations during the energization to the outside.

[0005] An object of the present invention is to provide an electrical junction box with 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 electrical connection box comprising 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, Each of the pair of current-carrying bodies is a housing having a box shape, electronic components arranged inside the housing, and bus bars provided on a mounting wall that is one box wall of the housing and to which the electronic components are electrically connected, and the mounting wall is arranged so that an outer surface of the mounting wall faces the outer surface of the cooling body; The electronic component is The electronic component is configured to include 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, and the movable contact is located farther from the side wall inside the electronic component than the plurality of terminals. 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 bus bars are arranged so that the outer surfaces of the mounting walls of the current-carrying bodies face the outer surface of the cooling body, sandwiching the cooling body. This allows Joule heat generated when current is applied to the internal circuits of the electronic components, the contact points between the electronic components and the bus bars, and the bus bars themselves to be 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 used more efficiently than when only one outer surface of the cooling body is used for heat absorption. As such, the electrical junction box of this configuration has excellent heat dissipation properties.

[0009] Furthermore, compared to when a pair of current-carrying bodies are simply arranged side by side on one outer surface of the cooling body, the size of the cooling body can be made smaller, thereby contributing to the miniaturization and cost reduction of the electrical junction box. In addition, when the electrical junction box is used with the outer surface of the cooling body and the mounting wall of the current-carrying body extending vertically (up and down), the terminals and movable contacts inside the electronic components connected to the bus bar are arranged so as to be aligned in a direction intersecting the vertical direction (e.g., horizontally). Therefore, even if a component around the movable contact falls off due to, for example, aging or excessive external force, the component falls downward in the vertical direction, preventing the component from interfering with the switching between electrical conduction and electrical non-conduction between the movable contact and the terminal.

[0010] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation 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. [Figure 2] 2 is a top view of the electrical junction box shown in FIG. 1, seen through the housing of the current-carrying body. [Figure 3] 3 is a front view of the electrical junction box shown in FIG. 1, seen through the housing of the current-carrying body. [Figure 4] 4 is a cross-sectional view of the electrical junction box shown in FIG. 1 taken along a horizontal plane around the relay arranged inside the housing of the current conductor, with the inside of the relay seen through. DETAILED DESCRIPTION OF THE INVENTION

[0012] <Embodiment> An electric junction box 1 according to an embodiment of the present invention will be described below 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 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 using bolts 4 and nuts 5.

[0013] For ease 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 perpendicular to one another. 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 constituting the electrical junction box 1 will be described below in order.

[0014] First, the cooling body 2 will be described. As shown in FIGS. 1 and 2, the cooling body 2 has a rectangular parallelepiped main body 10 that extends in the left-right and up-down directions and is thin in the front-rear 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 interior 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 radiator (not shown) located outside the cooling body 2. Cooling water cooled by the radiator is introduced into the interior of the main 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 main body 10. The heat-absorbing (heated) cooling water is returned from the interior of the main body 10 through the outlet passage 12 to the radiator and is cooled again. By repeating this cycle, the cooling body 2 functions to absorb heat from the outer surface of the main body 10 and radiate heat to the outside.

[0015] Next, the pair of current conductors 3A and 3B will be described. As shown in FIGS. 1 and 2, the pair of current conductors 3A and 3B have the same external shape and the same structure, except for the presence or absence of a fuse 40 (described later) and the arrangement of a bus bar 50 (see FIG. 2). The pair of current conductors 3A and 3B are arranged so as to sandwich the cooling body 2 in the front-to-rear direction, with their front-to-rear directions reversed (with their flange portions 22 (described later) facing each other in the front-to-rear direction). It is preferable that the weights of the pair of current conductors 3A and 3B be approximately the same so that there is no excessive difference in weight between the front and rear of the cooling body 2 when the pair of current conductors 3A and 3B are assembled to the cooling body 2. First, the current conductor 3A of the pair of current conductors 3A and 3B will be described below.

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

[0017] The housing 20 has a rectangular 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 and arranged opposite the rear end side wall of the cooling body 2) functions as a mounting wall 21 on which a bus bar 50 is provided (see FIGS. 2 and 4). A plurality of through holes 23 penetrating the mounting wall 21 from inside to outside are formed in the mounting wall 21 at the location where the bus bar 50 is provided (see FIG. 4). The effect of providing such through holes 23 will be described later. A pair of left and right flange portions 22 is provided on the housing 20 so as to extend continuously outward from the mounting wall 21 in both the left and right directions. The flange portions 22 have a plurality of through holes (not shown) aligned in the up-down direction for inserting bolts 4 therethrough. The flange portions 22 are used for the above-described fastening using the bolts 4 and nuts 5.

[0018] As shown in FIG. 2 , inside the housing 20, two relays 30 and one fuse 40 are arranged near the inner surface of the mounting wall 21 and aligned in the left-right direction along the inner surface of the mounting wall 21. The relays 30 are components that perform a switch function of turning on and off current flow, and the fuse 40 is a component that performs a fuse function of turning off current when a current exceeding its rated value flows. A plurality of flat bus bars 50 are provided on the mounting wall 21 so as to face the inner surface of the mounting wall 21 and 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 fuses 40 are electrically connected.

[0019] 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 below with reference to Figure 4. The relay 30 includes a pair of metal terminals 31 protruding from one side wall (front-end side wall) of the relay 30 housing, a metal movable contact 32 provided inside the relay 30 housing and capable of mechanically switching between electrical continuity and electrical discontinuity between the plurality of terminals 31, a coil 33 provided inside the relay 30 housing and driving the movable contact 32, and a contact spring 35 provided inside the relay 30 housing 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 toward the conductive side (front side). When current is applied to the coil 33, the coil 33 exerts an attractive force that drives the movable contact 32 toward 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 plurality of terminals 31 by switching between electrical continuity and non-conduction to the coil 33 .

[0020] In the relay 30, the movable contact 32 is located farther (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 positioned to be aligned in the front-to-rear direction. Therefore, even if a component (e.g., coil 33) around the movable contact 32 falls off due to, for example, deterioration over time or excessive external force, the component falls downward in the vertical direction, and therefore, it is possible to prevent the component from interfering with the switching between electrical continuity and electrical non-conduction between the movable contact 32 and the multiple terminals 31.

[0021] Each of the plurality of terminals 31 of the relay 30 is fastened to the corresponding bus bar 50 by a metal bolt 51 in a recess of each of the corresponding pair of bus bars 50. This fixes the pair of bus bars 50 and the relay 30 to each other, and electrically connects the pair of bus bars 50 to the relay 30. The current conductor 3A of the pair of current conductors 3A, 3B has been described above.

[0022] Next, the conductor 3B of the pair of conductors 3A, 3B will be described. The conductor 3B has the same external shape as the conductor 3A. The conductor 3B has the same structure as the conductor 3A, except that the fuse 40 is not provided and the bus bar 50 is accordingly arranged differently (see FIG. 2). Therefore, a detailed description of the other structures of the conductor 3B will be omitted. Each component constituting the electrical junction box 1 has been described above.

[0023] Next, the assembly of the electrical junction box 1 will be described. To assemble the electrical junction box 1, as shown in FIG. 1, the pair of current-carrying bodies 3A, 3B are arranged on the rear and front sides of the cooling body 2 so that the pair of current-carrying bodies 3A, 3B sandwich the cooling body 2 in the front-rear direction. Next, a paste-like heat-transfer paste 70 with excellent heat conductivity is filled in the gap between the outer surface of the mounting wall 21 of the opposing current-carrying body 3A and the outer surface of the main body 10 of the cooling body 2 (see FIG. 4), and in the gap between the outer surface of the mounting wall 21 of the opposing current-carrying body 3B and the outer surface of the main body 10 of the cooling body 2. Next, the cooling body 2 and the pair of current-carrying bodies 3A, 3B are fastened and fixed together using a plurality of bolts 4 and a plurality of nuts 5 inserted collectively through through-holes (not shown) provided in the flanges 22 of the pair of current-carrying bodies 3A, 3B and the main body 10 of the cooling body 2. Next, one bus bar 50 provided on the mounting wall 21 of the current-carrying body 3A and one bus bar 50 provided on the mounting wall 21 of the current-carrying body 3B are electrically connected by a connecting bus bar 60 provided outside the housing parts 20 of the current-carrying bodies 3A and 3B (see FIG. 2). This completes the assembly of the electrical junction box 1, and the electrical junction box 1 shown in FIG. 1 is obtained. Note that instead of the connecting bus bar 60, the bus bars 50 may be connected to each other using electric wires.

[0024] 1 and other figures, in this example, on both the left and right sides of the electrical junction box 1, the positions where the bolts 4 are inserted from the front side and fastened to the nuts 5 on the rear side and the positions where the bolts 4 are inserted from the rear side and fastened to the nuts 5 on the front side are arranged alternately in the up-down direction. As a result, compared to an embodiment in which the bolts 4 are inserted from one side in the front-to-rear direction and fastened to the nuts 5 on the other side in the front-to-rear direction, the external force acting on the pair of current-carrying bodies 3A, 3B to move closer to each other due to fastening is more easily distributed at all fastening positions on both the left and right sides of the electrical junction box 1, and therefore tilting (floating) of the pair of current-carrying bodies 3A, 3B relative to the cooling body 2 is less likely to occur.

[0025] 2 and 4, when the electrical junction box 1 is fully assembled, the pair of current-carrying bodies 3A, 3B are arranged so that the outer surfaces of the mounting walls 21 of the current-carrying bodies 3A, 3B, on which the bus bar 50 is provided, face the outer surface of the cooling body 2 and sandwich the cooling body 2 between them. As a result, when the pair of current-carrying bodies 3A, 3B are energized, Joule heat generated in the internal circuit of the relay 30 (particularly the movable contact 32 and the coil 33), the contact points between the relay 30 and the fuse 40 and the bus bar 50, and the bus bar 50 itself is easily absorbed by the cooling body 2 via the mounting walls 21 and the heat-transfer paste 70. Furthermore, because the pair of current-carrying bodies 3A, 3B are arranged so as to sandwich the cooling body 2, the heat absorption capacity of the cooling body 2 can be used more efficiently than when only one outer surface of the cooling body 2 is used for heat absorption.

[0026] Furthermore, in the assembled state of the electrical junction box 1, as shown in Fig. 4, for each of the pair of current-carrying bodies 3A, 3B, a portion of the heat-transfer paste 70 disposed in the gap between the outer surfaces of the opposing mounting walls 21 and the outer surface of the main body 10 of the cooling body 2 passes through the multiple through-holes 23 formed in the mounting walls 21, spreads to the inner surface of the mounting walls 21, and comes into contact with the bus bar 50 facing the inner surface of the mounting walls 21 (see Fig. 4). In other words, the heat-transfer paste 70 comes into contact with both the cooling body 2 and the bus bar 50 via the through-holes 23. This allows Joule heat generated at the contact points between the relay 30 and the bus bar 50 and the bus bar 50 itself, as well as at the contact points between the relay 30 and the fuse 40 and the bus bar 50, to be efficiently transferred to the cooling body 2 via the heat-transfer paste 70.

[0027] Furthermore, when the electrical junction box 1 is fully assembled, the bolts 4 and nuts 5 secure the pair of current-carrying bodies 3A, 3B together while applying an external force that moves the pair of current-carrying bodies 3A, 3B toward each other. This allows the mounting walls 21 of the housings 20 of the current-carrying bodies 3A, 3B to be maintained in close proximity to the outer surface of the cooling body 2. Furthermore, since the relatively heavy cooling body 2 is disposed between the pair of current-carrying bodies 3A, 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] <Actions and Effects> As described above, in the electrical junction box 1 according to this embodiment, the pair of current-carrying bodies 3A, 3B, each having a relay 30, a fuse 40, and a bus bar 50, are arranged so that the outer surfaces of the mounting walls 21 of the current-carrying bodies 3A, 3B, on which the bus bar 50 is provided, face the outer surface of the cooling body 2, and so that the cooling body 2 is sandwiched between them. This allows Joule heat generated in the internal circuit of the relay 30 (particularly the movable contact 32 and coil 33), the contact points between the relay 30 and the fuse 40 and the bus bar 50, and the bus bar 50 itself, when current is applied, to be easily absorbed by the cooling body 2. Furthermore, because the pair of current-carrying bodies 3A, 3B are arranged so as to sandwich the cooling body 2, the heat absorption capacity of the cooling body 2 can be utilized more efficiently than when only one outer surface of the cooling body 2 is used for heat absorption. Thus, the electrical junction box 1 according to this embodiment has excellent heat dissipation properties.

[0029] Furthermore, since the size of the cooling body 2 can be made smaller than when a pair of conductive bodies 3A, 3B are arranged side by side on one outer surface of the cooling body 2, the electrical connection box 1 can be made smaller and less expensive.

[0030] Furthermore, the electrical connection box 1 is used in an orientation in which the outer surface of the cooling body 2 that absorbs heat and the mounting walls 21 of the current-carrying bodies 3A and 3B extend vertically. As a result, inside the relay 30 connected to the bus bar 50, the terminal 31 and the movable contact 32 are positioned side by side in a direction intersecting the vertical direction (front-to-back direction). Therefore, even if a component (e.g., the coil 33) around the movable contact 32 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 the switching between electrical continuity and electrical non-conduction between the movable contact 32 and the terminal 31.

[0031] Furthermore, the heat transfer paste 70, which is arranged to pass through the through holes 23 of the housing parts 20 of the current-carrying bodies 3A and 3B, comes into contact with both the cooling body 2 and the bus bar 50. This allows Joule heat generated at the contact points between the relays 30 and fuses 40 and the bus bar 50, and in the bus bar 50 itself, to be efficiently transferred to the cooling body 2 via the heat transfer paste 70. Therefore, the electrical junction box 1 according to this embodiment has even better heat dissipation properties.

[0032] Furthermore, a plurality of bolts 4 and nuts 5 fix the pair of current-carrying bodies 3A, 3B while applying an external force to bring the pair of current-carrying bodies 3A, 3B closer to each other. This allows the mounting walls 21 of the housing parts 20 of the current-carrying bodies 3A, 3B to remain in close proximity to the outer surface of the cooling body 2, thereby maintaining excellent heat dissipation performance for a long period of time.

[0033] <Other forms> It should be noted that 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 modifications, improvements, etc. are possible as appropriate. In addition, the material, shape, dimensions, number, location, etc. of each component in the above-described embodiments are arbitrary and not limited as long as the present invention can be achieved.

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

[0035] [1] An electrical connection box (1) comprising a cooling body (2) capable of absorbing heat from an outer surface and radiating heat to the outside, and a pair of current-carrying bodies (3A, 3B) arranged to sandwich the cooling body (2), Each of the pair of current-carrying bodies (3A, 3B) is The cooling device includes a box-shaped housing (20), electronic components (30, 40) arranged inside the housing (20), and a bus bar (50) provided on a mounting wall (21) that is one of the box walls of the housing (20) and to which the electronic components (30, 40) are electrically connected, and the mounting wall (21) is arranged so that an outer surface of the mounting wall (21) faces the outer surface of the cooling body (2), 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 (31) 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).

[0036] According to the electrical junction box of the configuration [1] above, a pair of current-carrying bodies containing electronic components and bus bars are arranged so that the outer surfaces of the mounting walls of the current-carrying bodies face the outer surface of the cooling body, sandwiching the cooling body. This allows Joule heat generated when current is applied to the internal circuits of the electronic components, the contact points between the electronic components and the bus bars, and the bus bars themselves to be 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 cooling body's heat absorption capacity can be used more efficiently than when only one outer surface of the cooling body is used for heat absorption. As such, the electrical junction box of this configuration has excellent heat dissipation properties.

[0037] Furthermore, compared to when a pair of current-carrying bodies are simply arranged side by side on one outer surface of the cooling body, the size of the cooling body can be made smaller, thereby contributing to the miniaturization and cost reduction of the electrical junction box. In addition, when the electrical junction box is used with the outer surface of the cooling body and the mounting wall of the current-carrying body extending vertically (up and down), the terminals and movable contacts inside the electronic components connected to the bus bar are arranged so as to be aligned in a direction intersecting the vertical direction (e.g., horizontally). Therefore, even if a component around the movable contact falls off due to, for example, aging or excessive external force, the component falls downward in the vertical direction, preventing the component from interfering with the switching between electrical conduction and electrical non-conduction between the movable contact and the terminal.

[0038] [2] The electrical connection box (1) described in [1] above, a heat transfer member (70) for transferring heat between the cooling body (2) and each of the pair of current-carrying bodies (3A, 3B), The housing portion (20) of each of the pair of current-carrying bodies (3A, 3B) is a through hole (23) penetrating the mounting wall (21) from the inside to the outside, The heat transfer member (70) The cooling body (2) is disposed so as to pass through the through hole (23) and come into contact with both the cooling body (2) and the bus bar (50) provided on the mounting wall (21). Electrical junction box (1).

[0039] In the electrical junction box of the configuration [2] above, the heat transfer member, which is arranged to pass through the through-hole of the housing of the current-carrying body, contacts both the cooling body and the bus bar. This allows Joule heat generated in the internal circuit of the electronic component, the contact points between the electronic component and the bus bar, and the bus bar itself to be efficiently transferred to the cooling body via the heat transfer member. Therefore, the electrical junction box of this configuration has even better heat dissipation properties.

[0040] [3] The electrical connection box (1) described in [1] above, and further comprising fastening members (4, 5) that fix the pair of current-carrying bodies (3A, 3B) together while applying an external force so that the pair of current-carrying bodies (3A, 3B) approach each other. Electrical junction box (1).

[0041] In the electrical junction box having the configuration [3] above, the fastening member fixes the pair of current-carrying bodies while applying an external force to bring the pair of current-carrying bodies closer to each other, thereby maintaining the mounting wall of the housing of the current-carrying body in close proximity to the outer surface of the cooling body, thereby maintaining excellent heat dissipation performance for a long period of time. [Explanation of symbols]

[0042] 1 Electrical junction box 2 Cooling body 3A current carrying body 3B Current carrying body 4 Bolts (fastening members) 5 Nut (fastening member) 20 Housing 21 Mounting wall 23 Through hole 30 Relay (electronic component) 31 terminals 32 Movable contact 40 Fuse (electronic component) 50 Bus Bar 70 Heat transfer paste (heat transfer material)

Claims

1. An electrical connection box comprising 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, Each of the pair of current-carrying bodies is a housing having a box shape, electronic components arranged inside the housing, and a bus bar provided on a mounting wall which is one box wall of the housing and to which the electronic components are electrically connected, the mounting wall being arranged such that an outer surface of the mounting wall faces the outer surface of the 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 heat transfer member for transferring heat between the cooling body and each of the pair of current-carrying bodies, The housing portion of each of the pair of current-carrying bodies is a through hole penetrating the mounting wall from inside to outside, The heat transfer member is the heat sink is disposed so as to pass through the through hole and come into contact with both the heat sink and the bus bar provided on the mounting wall; Electrical junction box.

3. 2. The electrical connection box according to claim 1, A fastening member that fastens the pair of current-carrying bodies while applying an external force so that the pair of current-carrying bodies approach each other, Electrical junction box.

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