Electrical connection box

Abstract

To provide an electrical connection box capable of enhancing freedom of connection positions while ensuring heat dissipation.SOLUTION: An electrical connection box 10 comprises: a base member 20 disposed above an external cooling member 70; a relay 30 disposed on the base member 20; and a bus bar 40 connected to the relay 30. The bus bar 40 has: a connection portion 41 electrically connected to the relay 30; a heat dissipation constituent portion 42 that extends from the connection portion 41 to be disposed below the relay 30; and a main circuit constituent portion 43 that extends from the connection portion 41 to a direction different from the heat dissipation constituent portion 42 to be connected to a bus bar for connection 50.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an electrical junction box. [Background technology]

[0002] Conventionally, there has been an electrical junction box that includes an equipment cover placed on a metal cooling member, electric circuit components such as relays held within the equipment cover, and a bus bar connected to the electric circuit components (see, for example, Patent Document 1). The bus bar has a connection portion electrically connected to the electric circuit component, a lower extension portion extending downward from the connection portion, a lateral extension portion bending from the lower extension portion and extending to pass below the electric circuit component, and an upper extension portion bending upward from the lateral extension portion. The tip of the upper extension portion of the bus bar is connected to another circuit component, such as another bus bar. Furthermore, the lateral extension portion passing below the electric circuit component is in contact with the cooling member via a thermally conductive sheet or the like, thereby ensuring good heat dissipation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-93713 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the electrical connection box described above, the bus bar extends to pass below the electrical circuit component and is connected to another circuit component, such as another bus bar, so the connection position is limited.

[0005] An object of the present disclosure is to provide an electrical junction box that can improve the degree of freedom in connection positions while ensuring heat dissipation. [Means for solving the problem]

[0006] The electrical junction box of the present disclosure is an electrical junction box comprising a base member arranged on an external cooling member, electric circuit components arranged on the base member, and a bus bar connected to the electric circuit components, wherein the bus bar has a connection portion electrically connected to the electric circuit components, a heat dissipation component extending from the connection portion and arranged below the electric circuit components, and a main circuit component extending from the connection portion in a direction different from the heat dissipation component and connected to other circuit components. [Effects of the Invention]

[0007] According to the electrical junction box of the present disclosure, it is possible to improve the degree of freedom in connection positions while ensuring heat dissipation. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a partial perspective view of an electrical junction box according to an embodiment. [Figure 2] FIG. 2 is a partially exploded perspective view of the electrical junction box according to the embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view of an electrical junction box and an external cooling member according to an embodiment. [Figure 4] FIG. 4 is a partial perspective view of the electrical junction box according to one embodiment. [Figure 5] FIG. 5 is a partial perspective view of an electric junction box according to another embodiment. [Figure 6] FIG. 6 is a schematic cross-sectional view of an electric junction box and an external cooling member in another example. [Figure 7] FIG. 7 is a partial perspective view of an electric junction box according to another embodiment. [Figure 8] FIG. 8 is a schematic cross-sectional view of an electric junction box and an external cooling member in another example. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. The electrical connection box of the present disclosure comprises: [1] An electrical connection box comprising a base member arranged on an external cooling member, electric circuit components arranged on the base member, and a bus bar connected to the electric circuit components, wherein the bus bar has a connection portion electrically connected to the electric circuit components, a heat dissipation component extending from the connection portion and arranged below the electric circuit components, and a main circuit component extending from the connection portion in a direction different from the heat dissipation component and connected to other circuit components.

[0010] According to this configuration, the busbar has a heat dissipation component extending from a connection portion electrically connected to the electric circuit component and positioned below the electric circuit component, allowing the heat dissipation component to be in direct or indirect contact with an external cooling member, thereby ensuring good heat dissipation. Furthermore, the busbar has a main circuit component extending from the connection portion in a direction different from the heat dissipation component and connected to another circuit component, so the connection position with the other circuit component is not restricted by the heat dissipation component. Therefore, the degree of freedom in connection position is improved compared to a configuration in which the busbar is connected to another circuit component at the end of the heat dissipation component, for example.

[0011] [2] In the above [1], the main circuit component may have a connection hole penetrating vertically, and may be fixed to the other circuit components by a fastening member passing through the connection hole. According to this configuration, the main circuit component has connection holes that penetrate vertically and can be fixed to other circuit components by fastening members that penetrate the connection holes, so that the fixing of other circuit components can be performed from above, improving assembly workability.

[0012] [3] In the above [1] or [2], the base member may have a base main body having an assembly hole penetrating vertically, and a sub-base member that can be assembled to the assembly hole with the electrical circuit component and the bus bar fixed thereto.

[0013] According to this configuration, the base member includes a base main body having an assembly hole penetrating vertically, and a sub-base member that can be assembled into the assembly hole with the electric circuit components and bus bars fixed thereto, which makes it easy to set the shape of the sub-base member, for example. For example, it is easy to thin the thickness of a portion of the sub-base member in the base member.

[0014] [4] In the above item [3], the sub-base member may be configured to be able to be assembled into the assembly hole from above. According to this configuration, the sub-base member can be assembled into the assembly holes from above, improving assembly workability. For example, when electrical circuit components and bus bars are sequentially assembled to a base member to which many other components are assembled, assembly from the side is required, and assembly workability may be impaired due to other components getting in the way. In contrast, because the sub-base member, with the electrical circuit components and bus bars fixed thereto, can be assembled into the assembly holes from above, improving assembly workability.

[0015] [5] In the above [3] or [4], the bus bar may be insert-molded into the sub-base member. According to this configuration, the bus bar is insert molded into the sub-base member, so that the bus bar can be firmly fixed to the sub-base member without rattle, compared to a configuration in which the bus bar is assembled to the sub-base member, for example.

[0016] [6] In the above [5], a fixing bolt may be provided which is insert-molded into the sub-base member, and the fixing bolt may protrude from the sub-base member so as to be able to fix the electric circuit component.

[0017] According to this configuration, the fixing bolts insert-molded into the sub-base member protrude from the sub-base member so as to be able to fix the electric circuit components to the sub-base member easily and firmly. Furthermore, because the fixing bolts are insert-molded into the sub-base member together with the bus bars, they do not complicate the manufacturing process by themselves and can be easily installed.

[0018] [7] In the above item [6], the fixing bolt may protrude upward from the sub-base member so as to be able to fix the electric circuit component from above. According to this configuration, the fixing bolt protrudes upward from the sub-base member so as to be able to fix the electric circuit component from above, so that the electric circuit component can be easily and firmly fixed to the sub-base member from above.

[0019] [8] In any one of the above items [3] to [7], the sub-base member may have a covering portion that covers a lower surface of the heat dissipation component. According to this configuration, the sub-base member has a covering portion that covers the underside of the heat dissipation component, so that it can be brought into direct or indirect contact with an external cooling member without using a separate insulating member, for example.

[0020] [9] In any one of the above items [3] to [7], the lower surface of the heat dissipation component may be exposed from the sub-base member. According to this configuration, the lower surface of the heat dissipation component is exposed from the sub-base member, and therefore, it is possible to improve heat dissipation performance compared to when it is covered by the covering portion of the sub-base member, for example.

[0021]

[10] In any one of the above items [3] to [9], the sub-base member may have a recess or a hole that opens to an upper surface on which the electric circuit component is placed. According to this configuration, the sub-base member has recesses or holes that open to the upper surface on which the electric circuit components are placed, which makes it possible to suppress the occurrence of sink marks and improve heat dissipation, for example.

[0022]

[11] In any one of [1] to

[10] above, a connecting bus bar may be provided as the other circuit component, and the bus bar may be made of a metal material having a higher thermal conductivity than the metal material constituting the connecting bus bar.

[0023] According to this configuration, the bus bar connected to the connecting bus bar as another circuit component is made of a metal material having a higher thermal conductivity than the metal material constituting the connecting bus bar, thereby improving heat dissipation through the bus bar.

[0024]

[12] In the above

[11] , a clad material may be provided between the busbar and the connecting busbar at the connection portion between the busbar and the connecting busbar, and the clad material may have a metal of the same type as the busbar arranged at the portion where it contacts the busbar, and a metal of the same type as the connecting busbar arranged at the portion where it contacts the connecting busbar.

[0025] According to this configuration, the clad material between the busbar and the connecting busbar has a metal of the same type as the busbar arranged at the portion that comes into contact with the busbar, and a metal of the same type as the connecting busbar arranged at the portion that comes into contact with the connecting busbar, thereby suppressing corrosion of the busbar and the connecting busbar.

[0026] [Details of the embodiments of the present disclosure] Specific examples of the present disclosure will be described below with reference to the drawings. In each drawing, for the convenience of explanation, some components may be exaggerated or simplified. Furthermore, the dimensional proportions of each part may differ from one drawing to another. Furthermore, the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0027] (Configuration of electrical junction box 10) 1 to 3, the electrical junction box 10 includes a base member 20, a relay 30 as an electrical circuit component, a bus bar 40, and a connection bus bar 50 as another circuit component. Note that the electrical junction box 10 includes a plurality of electrical circuit components, such as a plurality of relays 30 and fuses, but in this embodiment, only the portion where one relay 30 is located will be described. The electrical junction box 10 includes two bus bars 40 and two connection bus bars 50 for one relay 30.

[0028] (Configuration of base member 20) The base member 20 is made of a resin material and has a base main body 21 and a sub-base member 22. One sub-base member 22 is provided for each relay 30.

[0029] As shown in FIG. 2, the base body 21 has assembly holes 21a formed in a plate shape and penetrating vertically. The base body 21 also has body-side fixing holes 21b at locations corresponding to the assembly holes 21a. Two body-side fixing holes 21b are provided for each assembly hole 21a. The body-side fixing holes 21b are provided at diagonal positions of the substantially rectangular assembly hole 21a. The base body 21 also has fastening holes 21c at its four corners, etc. Note that FIG. 2 shows only two fastening holes 21c.

[0030] The sub-base member 22 is configured so that it can be assembled from above into the assembly holes 21a of the base main body 21. The sub-base member 22 is formed in a shape that fills the inside of the assembly holes 21a. The sub-base member 22 has sub-side fixing holes 22a at locations corresponding to the main body-side fixing holes 21b. With the sub-base member 22 positioned within the assembly holes 21a, it is assembled to the base main body 21 by bolts 61 that pass through the sub-side fixing holes 22a and the main body-side fixing holes 21b and are screwed into nuts 60 below the sub-base member 22.

[0031] The sub-base member 22 is provided with a fixing bolt 62. The fixing bolt 62 is insert molded into the sub-base member 22. The fixing bolt 62 has a base (not shown) embedded in the sub-base member 22. The fixing bolt 62 protrudes upward from the sub-base member 22. Two fixing bolts 62 are provided. The fixing bolts 62 are provided in a diagonal position on the substantially rectangular sub-base member 22 that is different from the position where the sub-side fixing holes 22a are provided.

[0032] The sub-base member 22 also has recesses 22b that open to the upper surface. A plurality of recesses 22b are provided on the upper surface. In this embodiment, the recesses 22b are formed in a hexagonal shape when viewed from above. The upper portion of the sub-base member 22 has a honeycomb structure due to the alignment of the plurality of hexagonal recesses 22b.

[0033] (Configuration of Relay 30) As shown in FIG. 2, the relay 30 includes a relay case 31 and two relay terminals 32. The relay case 31 is formed by combining two resin members. The relay case 31 is a rectangular box that houses and holds relay components. Note that the relay components inside the relay case 31 are not shown in FIG. 3. As shown in FIG. 2, the relay case 31 has a fixing portion 31a at a position corresponding to the fixing bolt 62. The relay 30 is placed on the upper surface of the sub-base member 22 so that the fixing bolt 62 passes through the fixing portion 31a, and is fixed to the sub-base member 22 by a nut 63 that is threaded onto the fixing bolt 62. With this configuration, the relay 30 is disposed on the base member 20. The relay terminal 32 is formed in a cylindrical shape, and its end is exposed from the side of the relay case 31.

[0034] (Configuration of bus bar 40) The bus bar 40 is made of a metal plate and is electrically connected to the relay 30. More specifically, as shown in FIG. 3 , the bus bar 40 has a connection portion 41, a heat dissipation portion 42, and a main circuit portion 43.

[0035] The connection portion 41 has a through hole 41a, and is fixed to the relay terminal 32 and electrically connected to the relay terminal 32 by a bolt 64 that passes through the through hole 41a and is screwed onto the relay terminal 32 or a nut (not shown).

[0036] The heat dissipation component 42 extends from the connection portion 41 and is disposed below the relay 30. Specifically, the heat dissipation component 42 has a downward extension portion 42a extending downward from the connection portion 41 and a lateral extension portion 42b extending from the downward extension portion 42a while bending so as to be disposed below the relay 30.

[0037] The main circuit component 43 extends from the connection portion 41 in a direction different from that of the heat dissipation component 42 and is connected to a connection bus bar 50 (described later). Specifically, the main circuit component 43 has an upper extension portion 43a extending upward from the connection portion 41 in the opposite direction to the extension of the lower extension portion 42a, and an outer extension portion 43b bending from the upper extension portion 43a and extending laterally away from the relay 30. The "lateral" here refers to a direction intersecting the vertical direction. The outer extension portion 43b has a connection hole 43c penetrating vertically. A nut 65 communicating with the connection hole 43c is disposed on the underside of the outer extension portion 43b. As shown in FIG. 1 , the two bus bars 40 are fixed to the relay 30 so as to be aligned in the width direction of the bus bar 40.

[0038] The bus bar 40 is fixed to the sub-base member 22. In this embodiment, the bus bar 40 is insert-molded into the sub-base member 22. More specifically, as shown in FIG. 3 , the bus bar 40 is insert-molded into the sub-base member 22 so that the lower side of the lower extension portion 42a of the heat dissipation component 42 and the entire side extension portion 42b are embedded in the sub-base member 22.

[0039] 3 and 4, the busbar 40 is insert-molded into the sub-base member 22 so that the lower surface of the heat dissipation component 42 is covered by the sub-base member 22. That is, the sub-base member 22 of this embodiment has a covering portion 22c that covers the lower surface of the heat dissipation component 42. The covering portion 22c covers the entire lower surface of the heat dissipation component 42. The thickness of the covering portion 22c in the up-down direction is set to be thinner than the thickness of the busbar 40. The thickness of the covering portion 22c in the up-down direction is also set to be thinner than the thickness of the sub-base member 22 that is disposed above the busbar 40.

[0040] (Configuration of connection bus bar 50) As shown in FIG. 2, the connection busbar 50 is made of a metal plate. The connection busbar 50 has a first hole 51a at a first end 51 and a second hole 52a at a second end 52 opposite the first end 51. The connection busbar 50 is bent as necessary. As shown in FIG. 3, the connection busbar 50 is fixed to the busbar 40 by a fastening member, a bolt 66, which passes through the first hole 51a of the connection busbar 50 and the connection hole 43c of the busbar 40 and is screwed into a nut 65. The second end 52 of the connection busbar 50 is connected to another busbar or an electric circuit component (not shown) using the second hole 52a.

[0041] Next, the operation of the electrical junction box 10 configured as above will be described. As shown in FIG. 3, the electrical junction box 10 has a base member 20 placed on an external cooling member 70. The external cooling member 70 in this embodiment includes a metal case 71, a metal plate 72, and a sealing member 73. The metal case 71 has a flow path recess 71a and a screw hole 71b. The metal plate 72 is fixed to the metal case 71 via the sealing member 73 so as to close the flow path recess 71a. Cooling water 75 is filled in a flow path 74 defined by the flow path recess 71a and the metal plate 72. That is, the external cooling member 70 in this embodiment is a water-cooled type in which the cooling water 75 is circulated.

[0042] The base member 20 is fixed to the external cooling member 70 by bolts 67 that pass through the fastening holes 21c of the base member 20 and screw into the screw holes 71b. At this time, the base member 20 of the electrical junction box 10 is placed on the metal plate 72 of the external cooling member 70 via a gap filler 76. The gap filler 76 is made of, for example, silicone grease or the like, has high thermal conductivity, is paste-like, and is configured to be able to fill gaps and uneven surfaces, and is used to tightly adhere the base member 20 and the metal plate 72 together.

[0043] In the electrical junction box 10 configured and arranged as described above, the bus bars 40, whose temperature increases due to operation of the relays 30, are cooled by the external cooling member 70. This makes it possible to maintain, for example, the internal temperature of the relays 30 within an allowable temperature range.

[0044] Next, the effects of the above embodiment will be described below. (1) The busbar 40 has a heat dissipation component 42 that extends from a connection portion 41 electrically connected to the relay 30 and is disposed below the relay 30. This allows the heat dissipation component 42 to be in direct or indirect contact with the external cooling member 70, ensuring good heat dissipation. Furthermore, the busbar 40 has a main circuit component 43 that extends from the connection portion 41 in a direction different from the heat dissipation component 42 and is connected to the connecting busbar 50. This means that the connection position with the connecting busbar 50 is not restricted by the heat dissipation component 42. This improves the degree of freedom in the connection position compared to a configuration in which the busbar 40 is connected to another circuit component, such as the connecting busbar 50, at the end of the heat dissipation component 42.

[0045] (2) The main circuit component 43 has connection holes 43c that penetrate vertically, and can be fixed to the connection bus bar 50 by bolts 66 that penetrate the connection holes 43c. This allows the connection bus bar 50 to be fixed from above, improving assembly workability. That is, for example, if the fixing work is performed from the side, there is a risk that other components may get in the way and impair workability. However, this can be avoided, improving workability. Furthermore, for example, by performing the fixing work of the connection bus bar 50 from above, the same as the assembly work of the other components, the assembly workability is improved.

[0046] (3) The base member 20 includes a base main body 21 having an assembly hole 21a that penetrates vertically, and a sub-base member 22 that can be assembled into the assembly hole 21a with the relays 30 and bus bars 40 fixed thereto. This facilitates, for example, finely shaping the sub-base member 22. For example, the base member 20 can easily have a portion of the sub-base member 22 thinned.

[0047] (4) The base member 20 has a base main body 21 and a sub-base member 22, and the sub-base member 22 can be assembled from above into the assembly holes 21a of the base main body 21, improving assembly workability. That is, for example, when relays 30, bus bars 40, and the like are assembled sequentially to the base member 20 to which many components are assembled, assembly from the side is required, and assembly workability may be impaired due to other components getting in the way. In contrast, the sub-base member 22, to which the relays 30 and bus bars 40 are fixed, can be assembled from above into the assembly holes 21a, improving assembly workability.

[0048] (5) Because the busbars 40 are insert-molded into the sub-base member 22, the busbars 40 can be fixed firmly to the sub-base member 22 without rattle, compared to a configuration in which the busbars 40 are assembled to the sub-base member 22. Therefore, for example, the heat dissipation properties of the busbars 40 can be stably ensured.

[0049] (6) The fixing bolts 62 are insert-molded into the sub-base member 22, and protrude from the sub-base member 22 so as to be able to fix the relay 30. This allows the relay 30 to be easily and firmly fixed to the sub-base member 22. Furthermore, because the fixing bolts 62 are insert-molded into the sub-base member 22 together with the bus bars 40, they do not complicate the manufacturing process and can be easily provided.

[0050] (7) The fixing bolts 62 protrude upward from the sub-base member 22 so that the relay 30 can be fixed from above. This allows the relay 30 to be easily and firmly fixed to the sub-base member 22 from above.

[0051] (8) The sub-base member 22 has a covering portion 22c that covers the underside of the heat dissipation component 42, and therefore can be brought into direct or indirect contact with the external cooling member 70 without using a separate insulating member, for example.

[0052] (9) The sub-base member 22 has the recessed portion 22b that opens to the upper surface on which the relay 30 is placed. This makes it possible to, for example, prevent sink marks from occurring and improve heat dissipation.

[0053] (Example of change) The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0054] In the above embodiment, the sub-base member 22 has the covering portion 22c that covers the lower surface of the heat dissipation component 42, but this is not limitative and the sub-base member 22 may not have the covering portion 22c.

[0055] For example, modifications may be made as shown in Figures 5 to 7. In this example, the lower surface of the heat dissipation component 42 in the bus bar 40 is exposed from the sub-base member 80 (see Figures 6 and 7). In this example, as shown in Figure 6, an insulating member 81 is further disposed above the gap filler 76, and the heat dissipation component 42 is disposed on the external cooling member 70 via the insulating member 81 and the gap filler 76. In this way, since the lower surface of the heat dissipation component 42 is exposed from the sub-base member 80, it is possible to improve heat dissipation performance compared to when it is covered with, for example, the covering portion 22c.

[0056] Although not specifically mentioned in the above embodiment, the bus bar 40 and the connection bus bar 50 may be made of different metal materials. For example, the bus bar 40 may be made of a metal material with a higher thermal conductivity than the metal material that makes up the connection bus bar 50.

[0057] Specifically, for example, they may be modified as shown in Fig. 8. In this example, connection bus bar 50 is made of an aluminum-based metal material, and bus bar 40 is made of a copper-based metal material that has a higher thermal conductivity than aluminum-based metal materials.

[0058] The electrical junction box 10 of this example also includes a clad material 90 interposed between the busbar 40 and the connection busbar 50 at the connection portion between the busbar 40 and the connection busbar 50. More specifically, the clad material 90 is formed in a rectangular plate shape and has a through hole 90a. The clad material 90 is then fastened in place between the busbar 40 and the connection busbar 50 by a bolt 66 that passes through the first hole 51a of the connection busbar 50, the through hole 90a, and the connection hole 43c of the busbar 40 and is threaded into a nut 65.

[0059] Clad material 90 is a material formed by bonding two different types of metal together. In clad material 90, a metal of the same type as busbar 40 is disposed at the portion that contacts busbar 40, and a metal of the same type as connection busbar 50 is disposed at the portion that contacts connection busbar 50. That is, in clad material 90, a copper-based metal is disposed at the portion that contacts busbar 40, and an aluminum-based metal is disposed at the portion that contacts connection busbar 50. Note that in FIG. 8, the cross section of clad material 90 is illustrated as a single cross section.

[0060] In this way, the busbar 40 is made of a metal material with a higher thermal conductivity than the metal material constituting the connection busbar 50, thereby improving heat dissipation through the busbar 40. Furthermore, since the clad material 90 is interposed between the busbar 40 and the connection busbar 50, corrosion of the busbar 40 and the connection busbar 50, which is so-called galvanic corrosion, can be suppressed. Therefore, the electrical connection between the busbar 40 and the connection busbar 50 can be maintained stably.

[0061] In the above embodiment, the main circuit component 43 has the connection holes 43c that penetrate vertically, and the connection bus bars 50 are fixed from above, but this is not limiting. For example, the main circuit component 43 may have connection holes that penetrate laterally, intersecting the vertical direction, and the connection bus bars 50 may be fixed from the side.

[0062] In the above embodiment, the base member 20 includes the base main body 21 and the sub-base member 22, but this is not limiting and, for example, the base member 20 may not include the sub-base member 22. In other words, the relays 30 and the bus bars 40 may be fixed directly to the base member 20 without being fixed to the sub-base member 22.

[0063] In the above embodiment, the bus bar 40 is insert-molded into the sub-base member 22. However, this is not limitative. For example, the bus bar 40 may be assembled to the sub-base member 22.

[0064] In the above embodiment, the fixing bolts 62 are insert-molded into the sub-base member 22, but this is not limiting, and for example, the relay 30 may be configured not to include the fixing bolts 62. In other words, the relay 30 may be configured to be fixed to the sub-base member 22 by another structure.

[0065] In the above embodiment, the sub-base member 22 has recesses 22b that open to the upper surface on which the relays 30 are placed, but this is not limiting. For example, the sub-base member 22 may have holes that open to the upper surface on which the relays 30 are placed. This configuration can also suppress the occurrence of sink marks and improve heat dissipation. Alternatively, the sub-base member 22 may have no recesses 22b or holes that open to the upper surface. Furthermore, the upper portion of the sub-base member 22 has a honeycomb structure formed by arranging multiple hexagonal recesses 22b. However, this honeycomb structure is merely an example, and the structure, including the shape of the recesses 22b, may be modified as appropriate.

[0066] In the above embodiment, the sub-base member 22 is configured to be able to be assembled from above into the assembly hole 21a of the base main body 21, but this is not limited to this. For example, the sub-base member 22 may be configured to be able to be assembled from below into the assembly hole 21a.

[0067] In the above embodiment, the fixing bolt 62 protrudes upward from the sub-base member 22 so as to be able to fix the relay 30 from above. However, this is not limited to this, and the fixing bolt 62 may be configured to protrude laterally, for example.

[0068] In the above embodiment, the electrical connection box 10 is provided with the relay 30 as an electrical circuit component, but the type of electrical circuit component to which the bus bar 40 is connected may be changed, or the number of electrical circuit components may be changed.

[0069] In the above embodiment, the base member 20 of the electrical junction box 10 is disposed on the metal plate 72 of the external cooling member 70 via the gap filler 76, but this is not limiting. For example, the gap filler 76 may be replaced with a thermally conductive silicone sheet.

[0070] In the above embodiment, the external cooling member 70 is a water-cooled external cooling member 70 in which the cooling water 75 is circulated, but this is not limitative and the external cooling member 70 may be, for example, an aluminum plate with high heat dissipation properties. [Explanation of symbols]

[0071] 10 Electrical junction box 20 Base member 21 Base body 21a Mounting hole 21b Body side fixing hole 21c Fastening hole 22 Sub-base member 22a Sub-side fixing hole 22b Recess 22c Covering part 30 Relay (electrical circuit component) 31 Relay case 31a Fixed part 32 relay terminals 40 Busbar 41 Connection 41a Through hole 42 Heat dissipation component 42a Lower extension part 42b Side extension 43 Main circuit components 43a Extension part 43b Extended part 43c Connection hole 50 Connection bus bar (other circuit components) 51 First end 51a 1st hole 52 Second end 52a 2nd hole 60 nuts 61 volts 62 Fixing bolt 63 Nut 64 volts 65 Nut 66 Bolts (fastening members) 67 volts 70 External cooling element 71 Metal Case 71a Flow path recess 71b screw hole 72 Metal plate 73 Sealing material 74 Flow path 75 Cooling water 76 Gap Filler 80 Sub-base member 81 Insulating materials 90 Clad Material 90a through hole

Claims

1. a base member disposed on the external cooling member; an electric circuit component disposed on the base member; a bus bar connected to the electrical circuit component; An electrical connection box comprising: The bus bar is a connection portion electrically connected to the electric circuit component; a heat dissipation component extending from the connection portion and disposed below the electrical circuit component; a main circuit component extending from the connection portion in a direction different from the heat dissipation component and connected to other circuit components; Electrical junction box.

2. The main circuit component has a connection hole penetrating vertically, and can be fixed to the other circuit components by a fastening member passing through the connection hole.

2. The electrical junction box according to claim 1.

3. The base member is a base body having an assembly hole penetrating vertically; a sub-base member that can be assembled into the assembly hole with the electric circuit component and the bus bar fixed thereto, 2. The electrical junction box according to claim 1.

4. The sub-base member can be assembled into the assembly hole from above.

4. The electrical junction box according to claim 3.

5. The bus bar is insert-molded into the sub-base member.

4. The electrical junction box according to claim 3.

6. a fixing bolt that is insert-molded into the sub-base member; the fixing bolt protrudes from the sub-base member so as to be able to fix the electric circuit component; 6. The electrical junction box according to claim 5.

7. the fixing bolt protrudes upward from the sub-base member so as to be able to fix the electric circuit component from above; 7. The electrical junction box according to claim 6.

8. The sub-base member has a covering portion that covers a lower surface of the heat dissipation component.

4. The electrical junction box according to claim 3.

9. The lower surface of the heat dissipation component is exposed from the sub-base member.

4. The electrical junction box according to claim 3.

10. the sub-base member has a recess or a hole that opens to an upper surface on which the electric circuit component is placed; 4. The electrical junction box according to claim 3.

11. a connection bus bar as the other circuit component, the bus bar is made of a metal material having a higher thermal conductivity than the metal material constituting the connection bus bar; 2. The electrical junction box according to claim 1.

12. a clad material interposed between the bus bar and the connection bus bar at a connection portion between the bus bar and the connection bus bar, the clad material has a metal of the same type as the bus bar disposed at a portion thereof that comes into contact with the bus bar, and a metal of the same type as the connection bus bar disposed at a portion thereof that comes into contact with the connection bus bar; The electrical junction box according to claim 11.

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