JP2006042501A - Electric junction box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric junction box excellent in space efficiency wherein more electric components can be inserted in a limited space. <P>SOLUTION: An electronic circuit is formed over an insulating substrate, and electric components 24 are mounted on this electronic circuit to obtain a control circuit board 21. Multiple bus bars 10 are laminated with multiple insulating plates 11 in-between to obtain a power distribution board 12. The electric junction box 80 is obtained by placing the control circuit board 21 and the power distribution board 12 in a housing 40 so that the control circuit board is perpendicular to the power distribution board. Thus, an electric component 24 mounted on the control circuit board 21 can be additionally installed in the electric junction box 80 without increasing the projected area in the direction perpendicular to the board surface of the power distribution board 12. As a result, the space efficiency can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical junction box in which an electrical component is accommodated in a housing.

As this type of electrical junction box, for example, the one described in Patent Document 1 is known. In this product, a power distribution board formed by arranging a plurality of bus bars along an insulating board is housed in a housing, and an electrical component such as a relay is mounted on the upper surface of the housing and connected to the power distribution board. It has become so.
JP-A-8-322127

  However, according to the above-described configuration, the distribution board requires a minimum area required for mounting these electrical components. For this reason, when it was going to add an electrical component, it was necessary to increase the area of a power distribution board, and there existed a problem that the installation area of an electrical-connection box will enlarge.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a space-efficient electric junction box capable of mounting more electrical components in a limited space. .

  As a means for achieving the above object, the invention of claim 1 is characterized in that a distribution board formed by arranging a plurality of bus bars along an insulating board is accommodated in a housing, and an electrical component such as a relay is provided in the housing. In an electrical connection box that is connected to the power distribution board by attaching a product, a control circuit board having an electronic circuit formed on an insulating substrate different from the insulating substrate of the power distribution board is connected to the power distribution board in the housing. The electronic circuit of the control circuit board controls the electrical equipment on the power distribution board side or the electrical equipment such as a relay mounted on the control circuit board.

  According to a second aspect of the present invention, in the first aspect, the control circuit board is located at an end of the power distribution board, and the control circuit board extends to both sides of the power distribution board. It is characterized by being.

  According to a third aspect of the present invention, in the first or second aspect, the housing is integrally provided with an auxiliary housing for housing the control circuit board, and the auxiliary housing is opposite to the power distribution board. It is characterized in that the surface is open.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the control circuit board is provided with a heat radiating plate located on the open surface side of the auxiliary housing. .

  According to a fifth aspect of the present invention, in the apparatus according to any one of the first to fourth aspects, electrical components are attached to the housing from both the front and back sides of the power distribution board, and the power distribution of the auxiliary housing is performed. The height dimension in the direction orthogonal to the substrate is within the range of the maximum height of the electrical component attached to the front surface side of the housing and the maximum height of the electrical component attached to the back surface side. It is characterized by being set.

  According to a sixth aspect of the present invention, in the method according to any one of the first to fifth aspects, a plurality of bus bars are bonded between the control circuit board and the heat radiating plate via an insulating adhesive layer. In addition, a predetermined one of these bus bar groups is bent perpendicularly to the plate surface of the control circuit board, and a tab piece for connecting to the power distribution board is formed at the tip of the bus bar group. It is characterized by being.

  The invention according to claim 7 is the one according to claim 6, wherein a tab bar extending toward the control circuit board is formed on the bus bar along the power distribution board, and the tab piece on the power distribution board side; The tab piece on the control circuit board side is connected by a female relay terminal.

<Invention of Claim 1>
According to the first aspect of the invention, since the control circuit board is arranged so as to be perpendicular to the distribution board, the electrical connection can be made without increasing the projected area in the direction perpendicular to the plate surface of the distribution board. Electrical components can be mounted on the box. Thereby, the space efficiency of the electrical junction box can be improved.

<Invention of Claim 2>
Since electrical components such as relays are arranged in the housing and are connected to the power distribution board, among the spaces extending in the direction orthogonal to the power distribution board, a predetermined volume of space is occupied by the electrical components. Yes. According to the invention of claim 2, the control circuit board is located at the end of the distribution board, and the control circuit board has a T-shaped arrangement extending on both sides of the distribution board. As a result, the control circuit board can be arranged using the space originally occupied by the electrical component among the space extending in the direction orthogonal to the distribution board, so that the space efficiency of the electrical junction box can be improved. .

<Invention of Claim 3>
According to the invention of claim 3, since the auxiliary housing is formed integrally with the housing of the electrical junction box, the housing can be downsized as a whole as compared with the case where both are formed separately.

  Further, since the control circuit board can be assembled from the open surface side of the auxiliary housing, the assembly work of the control circuit board to the electrical junction box is facilitated.

<Invention of Claim 4>
According to the invention of claim 4, since the heat sink provided on the control circuit board is located on the open surface side of the auxiliary housing, the heat generated from the electrical components mounted on the control circuit board is transferred to the electrical junction box. Can be efficiently dissipated to the outside. Thereby, the heat dissipation of an electrical junction box can be improved.

<Invention of Claim 5>
Since electrical components are arranged on the housing from both the front and back sides of the distribution board, the maximum height of the electrical components attached to the front side of the housing and the back side of the space extending in the direction orthogonal to the distribution board The space divided by the maximum height and the width of the electrical components attached to the housing is occupied by the electrical junction box. According to the invention of claim 5, the auxiliary housing is formed in the space occupied by the electrical junction box in a state where the electrical components are attached. By accommodating the control circuit board in the auxiliary housing, the control circuit board can be arranged in the space originally occupied by the electric connection box, so that the space efficiency of the electric connection box can be improved.

<Invention of Claim 6>
According to invention of Claim 6, the tab piece formed in the front-end | tip of a bus-bar has faced the direction perpendicular | vertical to a control circuit board. For this reason, when the tab piece is inserted into, for example, a female terminal fitting disposed in the electrical connection box and an attempt is made to connect the control circuit board and the electrical connection box, the tab piece and the female terminal fitting come into contact with each other. Even if the tab piece bends and deforms in the direction perpendicular to the plate surface, it is bent vertically and the bending deformation is stopped at the site, so that the bus bar side attached to the control circuit board is connected to the plate surface of the bus bar. There is no force applied in the vertical direction. For this reason, when connecting a control circuit board and an electrical junction box, it can prevent that a control circuit board peels from a bus bar.

<Invention of Claim 7>
The bus bar disposed on the power distribution board and the bus bar bonded to the control circuit board are formed by punching a metal plate material. By processing the end of the bus bar into a tapered shape, a tab piece can be easily formed. Can be formed. The control circuit board and the power distribution board can be connected by connecting the tab pieces formed in this way by a simple technique of inserting the tab pieces into the female relay terminals. Thus, according to the seventh aspect of the present invention, the connection process between the control circuit board and the power distribution board can be simplified as a whole.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
The electrical junction box 80 of the present embodiment is one in which the distribution board 12 is accommodated in a flat housing 40 so that the plate surface faces in the vertical direction (see FIG. 4). The housing 40 is made of synthetic resin, and is formed by combining a lower case 60 whose upper surface is opened and an upper case 41 covering the opened upper surface.

  As shown in FIGS. 3 and 4, a relay mounting portion 62 formed in a recess for mounting the relay 87 on the lower wall of the lower case 60 and a connector hood portion for connecting a wire harness (not shown). 64 is formed. The relay mounting portion 62 is formed with a relay terminal insertion port 63 that penetrates the lower wall of the lower case 60 in the vertical direction, and a distribution terminal 13 to be described later is inserted therein. Further, a power distribution terminal 13 to be described later passes through the bottom wall of the connector hood portion 64 and protrudes into the connector hood portion 64.

  As shown in FIG. 2, the lower case 60 has a substantially rectangular shape when viewed from above. On the outer side surfaces of the side walls located on both sides in the longitudinal direction of the lower case 60, locks described later are provided at positions near both ends. A lock projection 67 is formed to be engaged with the piece 54 and fix the lower case 60 and the upper case 41.

  As shown in FIGS. 1 and 4, a connector hood for connecting a fuse mounting portion 43 that is recessed to mount a fuse 86 and a wire harness (not shown) on the upper wall of the upper case 41. A portion 46 is formed. The fuse mounting portion 43 is formed with a fuse terminal insertion port 44 penetrating the upper wall of the upper case 41 in the vertical direction, and a distribution terminal 13 to be described later is inserted therein. Further, a power distribution terminal 13 (described later) passes through the bottom wall of the connector hood portion 46 and protrudes into the connector hood portion 46.

  As shown in FIG. 1, the upper case 41 has a substantially rectangular shape as viewed from above. The upper case 41 has two outer side surfaces located on both sides in the longitudinal direction and the longitudinal direction of the upper case 41. A lance 50 for fixing the housing 40 to a vehicle body (not shown) is formed at positions near both ends of the outer side surfaces of the two parallel side walls.

  As shown in FIG. 1, the lower end of the outer side surface of the side wall located on both sides in the longitudinal direction of the upper case 41 is engaged with the lock projection 67 at a position corresponding to the lock projection 67 of the lower case 60. A lock piece 54 for fixing the upper case 41 and the lower case 60 is formed.

  The upper case 41 and the lower case 60 are integrated by assembling the upper case 41 from above the lower case 60 and elastically locking the lock piece 54 to the lock projection 67.

  The power distribution board 12 includes a plurality of bus bars 10 formed by punching a metal plate material, arranged in a plurality of layers (three layers in this embodiment), and an insulating plate 11 (which constitutes the power distribution board in claim 1) between the layers. (Corresponding to an insulating substrate). A predetermined one of the end portions of the bus bar 10 is bent upward or downward to serve as a power distribution terminal 13. Further, the end portion different from the power distribution terminal 13 is once bent downward and then bent so as to protrude to the left front side in FIG. 2, and its tip end portion is formed in a slightly tapered shape. A power distribution side tab piece 14 (corresponding to a power distribution board side tab piece in claim 7) for connection with the substrate 21 is provided.

  The insulating plate 11 has a substantially rectangular shape, and a plurality of insertion holes 15 for communicating with the upper and lower sides for inserting the power distribution terminals 13 are formed at predetermined positions on the plate surface.

  From the upper surface of the power distribution board 12, the power distribution terminals 13 protrude upward from the insertion holes 15. Further, the power distribution terminals 13 project downward from the insertion holes 15 from the lower surface of the power distribution board 12. And the distribution side tab piece 14 protrudes along with the same plane from the edge part of the left front side in FIG.

  As shown in FIG. 4, a control circuit board 21 is arranged at the end of the power distribution board 12. The control circuit board 21 is formed by forming a control circuit on one surface of an insulating substrate by printed wiring means and mounting an electrical component 24 such as a relay on the surface, on the surface opposite to the component mounting surface. A plurality of bus bars 10 are arranged in a state of being electrically connected to the control circuit. The bus bar 10 is integrally bonded to the insulating substrate through a thin adhesive sheet (not shown) having insulating properties. In addition, a heat radiating plate 22 for radiating heat generated from the electrical component 24 is bonded to the bus bar 10 via an insulating adhesive layer (not shown). The heat radiating plate 22 has a substantially rectangular shape, and is formed of a metal plate such as aluminum having high thermal conductivity, and includes a plurality of fins 26, and mounting insertion holes 27 are formed near the upper and lower ends. Has been. A predetermined one of the bus bars 10 is extended in a direction parallel to the plate surface of the control circuit board 21 and then bent so as to protrude to the component mounting surface side, and its tip is slightly tapered. The control side tab piece 25 (corresponding to the tab piece on the control circuit board side in claim 7) for connecting to the power distribution board 12 is formed. The control side tab pieces 25 are arranged on the same plane.

  As shown in FIG. 4, the power distribution board 12 and the control circuit board 21 are electrically connected by inserting the power distribution side tab piece 14 and the control side tab piece 25 into the female relay terminal 30. .

  As shown in FIG. 5, the female relay terminal 30 is formed in a substantially rectangular parallelepiped shape by punching a conductive metal plate into a predetermined shape by pressing and then bending it. The female relay terminal 30 is formed with a control side tab piece insertion port 31 for inserting the control side tab piece 25 on the right side in FIG. Further, on the left side in FIG. 5, a distribution side tab piece insertion port 32 for inserting the distribution side tab piece 14 is formed.

  An elastic contact piece 34 extends from the left end in FIG. 5 of the lower wall 33 of the female relay terminal 30 and is folded rightward in FIG. The elastic contact piece 34 is bent twice so as to form a substantially S shape when viewed from the side.

  The bottom surface of the elastic contact piece 34 that protrudes downward and bends when viewed from the side serves as a control-side contact portion 36 for connection to the control-side tab piece 25. In addition, the upper surface of the elastic contact piece 34 that protrudes and bends upward as viewed from the side serves as a power distribution side contact portion 35 for connection to the power distribution side tab piece 14. The upper wall of the female relay terminal 30 is formed to be lower one step downward and serves as a receiving portion 37 that contacts the power distribution side tab piece 14.

  As shown in FIG. 4, the distribution-side tab piece 14 inserted from the left in FIG. 4 into the distribution-side tab piece insertion port 32 contacts the distribution-side contact portion 35 and presses the elastic contact piece 34 downward. ing. As a result, the elastic contact piece 34 is bent and deformed, and the distribution-side tab piece 14 is sandwiched between the receiving portion 37 and the elastic contact piece 34 by its restoring elasticity.

  Further, the control-side tab piece 25 inserted from the right side in FIG. 4 into the control-side tab piece insertion port 31 is in contact with the control-side contact portion 36 and presses the elastic contact piece 34 upward. As a result, the elastic contact piece 34 is bent and deformed, and the control-side tab piece 25 is sandwiched between the lower wall 33 of the female relay terminal 30 and the elastic contact piece 34 by its restoring elasticity.

  On the other hand, a box-shaped lower case side auxiliary housing 68 opened to the left front side in FIG. 2 is formed on the left front side wall in FIG. 2 of the lower case 60 so that the control circuit board 21 can be accommodated. . A locking claw 58 that can be elastically deformed is formed to protrude upward at an end of the lower wall of the lower case side auxiliary housing 68 on the left front side in FIG.

  At a position near the lower end of the lower case side auxiliary housing 68, a cylindrical boss 81 for screwing the control circuit board 21 is formed so as to protrude to the left front side in FIG. A screw hole 82 is formed at the tip of the boss 81.

  Further, in the upper case 41, an upper case side auxiliary housing 55 opened to the left front side in FIG. 2 is formed on the left front side wall in FIG. 2 so that the control circuit board 21 can be accommodated.

  Of the upper wall of the upper case side auxiliary housing 55, an elastically deformable locking claw 58 is formed to hang downward at the end on the left front side in FIG.

  A cylindrical boss 81 for screwing the control circuit board 21 is formed in the upper case side auxiliary housing 55 so as to protrude to the left front side in FIG. A screw hole 82 is formed at the tip of the boss 81.

  In the state where the upper case 41 and the lower case 60 are integrated, the auxiliary housing formed by integrating the upper case side auxiliary housing 55 and the lower case side auxiliary housing 68 on the left front side of the housing 40 in FIG. 75 is formed with an opening 76 that opens to the left front side in FIG.

  As shown in FIG. 4, the vertical height H of the auxiliary housing 75 is between the top of the fuse 86 mounted on the fuse mounting portion 43 and the top of the relay 87 mounted on the relay mounting portion 62. It is set so as to be within the dimension W (substantially equal here).

  As shown in FIG. 4, the control circuit board 21 has an opening in the auxiliary housing 75 so as to be perpendicular to the power distribution board 12 and so that the heat radiating plate 22 is exposed to the outside of the housing 40. It is assembled | attached with respect to 76 from the open surface side. The control circuit board 21 is located at the end of the power distribution board 12, and the control circuit board 21 is in a T-shaped arrangement extending on both sides of the power distribution board 12.

  When the control circuit board 21 is assembled to the auxiliary housing 75 from the open side, the upper edge and the lower edge of the heat radiating plate 22 come into contact with the locking claw 58 from the right side in FIG. When the control circuit board 21 is further pushed in, the locking claw 58 opens outward and deforms to ride on the upper and lower edges of the heat sink 22. When the control circuit board 21 is further pushed in, the locking claw 58 is restored and deformed inward, and the upper end edge and the lower end edge of the heat radiating plate 22 are fitted inside the locking claw 58 to be prevented from coming off.

  A screw 84 is inserted into the mounting insertion hole 27 via a washer 85, and the screw 84 is screwed into the screw hole 82, whereby the control circuit board 21 is fixed to the auxiliary housing 75.

Next, the operation and effect of this embodiment will be described.
According to the present embodiment, since the control circuit board 21 is arranged so as to be perpendicular to the power distribution board 12, the electric circuit can be generated without increasing the projected area in the direction perpendicular to the plate surface of the power distribution board 12. The electrical component 24 can be mounted on the connection box 80. Thereby, the space efficiency of the electrical junction box 80 can be improved.

  Since the housing 40 is provided with the relay 87 and the fuse 86 from both the front and back sides of the power distribution board 12, the fuse mounted on the fuse mounting portion 43 in the space extending in the direction orthogonal to the power distribution board 12. The space within the dimension W between the top of 86 and the top of the relay 87 mounted on the relay mounting section 62 is occupied by the electrical junction box. According to the present embodiment, the control circuit board 21 is located at the end of the power distribution board 12, and the control circuit board 21 has a T-shaped arrangement extending on both sides of the power distribution board 12. The height dimension H in the vertical direction of the auxiliary housing 75 is set so as to be within the above-described dimension W, and the control circuit board 21 is accommodated in the auxiliary housing 75. Thereby, since the control circuit board 21 can be arranged in the space originally occupied by the electrical connection box 80, the space efficiency of the electrical connection box 80 can be improved.

  Further, according to the present embodiment, since the control circuit board 21 is attached to the opening 76 of the auxiliary housing 75 from the open surface side, there is a member that becomes an obstacle at the time of assembly work. Since it does not exist, the assembling work when accommodating the control circuit board 21 in the auxiliary housing 75 is facilitated. Then, by connecting the control circuit board 21 and the power distribution board 12 by an easy method of inserting the power distribution side tab piece 14 and the control side tab piece 25 formed at the end of the bus bar 10 into the female relay terminal 30. The process of assembling the control circuit board 21 to the electrical junction box 80 can be simplified as a whole.

  Further, the control-side tab piece 25 formed so as to protrude from the control circuit board 21 perpendicularly to the plate surface of the control circuit board 21 is inserted into the control-side tab piece insertion port 31 of the female relay terminal 30 from the right side of FIG. When inserted, the control-side tab piece 25 contacts the power distribution-side contact portion 36 from the right side of FIG. Then, the control side tab piece 25 may bend and deform in a direction perpendicular to the plate surface. However, since the bus bar 10 on which the control-side tab piece 25 is formed is bent perpendicularly to the plate surface of the control circuit board 21, bending deformation of the control-side tab piece 25 is absorbed by this vertically bent portion. Is done. For this reason, it is possible to prevent the portion of the bus bar 10 bonded to the insulating substrate from being bent and deformed in a direction perpendicular to the plate surface. Thereby, it can prevent that the heat sink 22 and the control circuit board 21 peel from the bus-bar 10. FIG.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In this embodiment, the power distribution board 12 is formed by laminating a plurality of bus bars 10 in three layers with the insulating plate 11 interposed therebetween. However, the present invention is not limited to this, and even if the power distribution board 12 is formed by only one layer. Alternatively, it may be formed by laminating two or more layers via the insulating plate 11.

  (2) In the present embodiment, the bus bar 10 and the insulating plate 11 are stacked so that both plate surfaces are parallel to form the power distribution board 12. However, the present invention is not limited to this, and the plate surface of the insulating plate 11 is not limited thereto. The board surface of the bus bar 10 and the bus bar 10 may be arranged so that the board surface of the insulating plate 11 and the bus bar 10 are in contact with each other.

  (3) In the present embodiment, the auxiliary housing 75 is formed integrally with the housing 40 of the electric junction box 80. However, the present invention is not limited to this, and the auxiliary housing 75 is formed separately and the electric junction box is formed. It is good also as a structure attached to 80 housings 40.

  (4) In the present embodiment, the control circuit board 21 is provided with the heat radiating plate 22. However, the present invention is not limited to this, and the heat generated from the electrical component 24 mounted on the control circuit board 21 is efficiently dissipated. If it is, it is good also as a structure in which the heat sink 22 is not provided. Moreover, you may provide heat radiating means other than the heat sink 22, such as a heat pipe.

  (5) In this embodiment, the vertical height H of the auxiliary housing 75 is such that the top of the fuse 86 mounted on the fuse mounting portion 43 and the top of the relay 87 mounted on the relay mounting portion 62. However, the present invention is not limited to this, and the dimension H may be set smaller than the dimension W. In addition, the dimension H may be set larger than the dimension W when a sufficient space in which the auxiliary housing 75 can be installed in a direction orthogonal to the power distribution board 12 can be secured.

  (6) In the present embodiment, a predetermined one of the bus bars 10 bonded to the control circuit board 21 is bent perpendicularly to the plate surface of the control circuit board 21, and the control side tab is formed at the tip of the bus bar 10. Although the configuration is such that the piece 25 is formed, the present invention is not limited to this, and when it is configured to prevent bending deformation in the direction perpendicular to the plate surface of the control-side tab piece 25 (for example, the tab piece 14 is When the bus bar 10 extends in parallel with the control circuit board 21 and the control-side tab piece 25 is formed at the tip of the bus bar 10, a predetermined one of the bus bars 10 is connected to the power distribution board 12. The control-side tab piece 25 is formed by bending it perpendicularly to the plate surface of the power distribution board 12 and forming the control-side tab piece 25 at the tip thereof. 25 and distribution side tab 1 Preparative may be connected by a female relay terminal 30 a.

  (7) According to the present embodiment, the control-side tab piece 25 and the distribution-side tab piece 14 are connected by the female relay terminal 30, but the present invention is not limited thereto. It is good also as a structure connected by welding the power distribution side tab piece 14. FIG.

  (8) According to the present embodiment, the control circuit board 21 is positioned at the end of the power distribution board 12, and the control circuit board 21 has a T-shaped arrangement extending on both sides of the power distribution board 12. However, the control circuit board 21 may be arranged vertically on the plate surface of the power distribution board 12.

The perspective view of the electrical junction box in this embodiment The exploded perspective view of the electrical junction box in this embodiment Bottom view of electrical junction box in this embodiment AA line sectional view of the electrical junction box in FIG. AA line sectional view showing the state before assembly of the electrical junction box in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Bus bar 11 ... Insulation board 12 ... Power distribution board 14 ... Power distribution side tab piece 20 ... Insulation board 21 ... Control circuit board 22 ... Heat sink 24 ... Electrical component 25 ... Control side tab piece 30 ... Female relay terminal 40 ... Housing 75 ... Auxiliary housing 80 ... Electric junction box 86 ... Fuse 87 ... Relay

Claims (7)

An electrical connection box in which a distribution board formed by arranging a plurality of bus bars along an insulating board is accommodated in a housing, and an electrical component such as a relay is mounted in the housing so as to be connected to the distribution board. In
A control circuit board having an electronic circuit formed on an insulating board different from the insulating board of the power distribution board is disposed in the housing so as to be perpendicular to the power distribution board. An electrical junction box characterized by controlling electrical components on the board side or electrical components such as relays mounted on the control circuit board. 2. The electrical connection according to claim 1, wherein the control circuit board is located at an end of the power distribution board, and the control circuit board has a T-shaped arrangement extending on both sides of the power distribution board. box. The auxiliary housing for accommodating the control circuit board is integrally provided in the housing, and the auxiliary housing is configured to open a surface opposite to the power distribution board. The electrical junction box according to 1 or 2. The electrical connection box according to any one of claims 1 to 3, wherein the control circuit board is provided with a heat radiating plate located on an open surface side of the auxiliary housing. Electrical components are attached to the housing from both front and back sides of the power distribution board, and the height dimension of the auxiliary housing in the direction orthogonal to the power distribution board is the surface attached to the front surface of the housing. 5. The electricity according to claim 1, wherein the electricity is set to be within a range of a width between a maximum height of the electrical component and a maximum height of the electrical component attached to the back side. Connection box. A plurality of bus bars are bonded via an insulating adhesive layer between the control circuit board and the heat sink, and a predetermined one of these bus bar groups is a plate surface of the control circuit board. The electrical connection according to claim 1, wherein a tab piece for connecting to the power distribution board is formed at a tip end portion of the electrical connection. box. A tab bar extending toward the control circuit board side is formed on the bus bar along the power distribution board, and the tab piece on the power distribution board side and the tab piece on the control circuit board side are formed by a female relay terminal. The electrical junction box according to claim 6, wherein the electrical junction box is connected.

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