JP2019146393A - Electric connection box - Google Patents

Abstract

To secure radiation performance from a circuit board while arranging a coil substrate on the circuit board, and to miniaturize the entire electric connection box in the electric connection box.SOLUTION: An electric connection box 1 is provided with: a coil component 10 having a coil 130; a circuit board 20 on which the coil component 10 is arranged; a heat radiation member 30 which radiates at least heat from the coil component 10; and a fastening member 40 which fastens at least the coil component 10 and the heat radiation member 30, the coil component 10, the circuit board 20, and the heat radiation member 30 are superposed on one another at a superposing position overlapping with the coil component 10 in upper perspective by viewing the coil component 10 from an upper part, the coil component 10 has a fastened part (fixed leg part 111) within a range of the superposing position, and the fastened part 111 is fastened to the heat radiation member 30 by the fastening member 40 in a form of sandwiching the circuit board 20.SELECTED DRAWING: Figure 3

Description

  The technology disclosed in this specification relates to an electrical junction box.

  Conventionally, for example, an electronic unit disclosed in Patent Document 1 is known as a circuit structure on which coil components are mounted. In this electronic unit, a coil base is attached to a heat radiating member in an overlapping manner, and a box-shaped coil case containing a choke coil is disposed on the coil base. The coil case is provided with a plate-like fixing portion. The fixing portion is erected vertically from the side wall to the outside so that the plate surface thereof is parallel to the upper wall and the bottom wall of the coil case, and an attachment hole is formed therethrough. The coil case is attached to the coil base by attaching the fixing hole of the fixing portion to the mounting hole provided on the upper surface of the coil base and screwing it.

JP 2017-22205 A

  However, with this technology, in addition to the space for placing the coil case on the coil base, a space for screwing the coil case on the side of the coil base is required, which hinders the miniaturization of the coil base and thus the entire electronic unit. End up.

  An electrical junction box according to a technique disclosed in the present specification includes a coil component having a coil, a circuit board on which the coil component is disposed, a heat dissipation member on which the circuit substrate is disposed, at least the coil component, and the A fastening member that fastens the heat radiating member, and the coil component, the circuit board, and the heat radiating member are superposed on each other at an overlapping position that overlaps the coil component in a top perspective view of the coil component as viewed from above. The coil component has a fastened portion in the range of the overlapping position, and the fastened portion is fastened to the heat dissipation member by the fastening member so as to sandwich the circuit board.

  According to this configuration, the space for arranging the coil component on the circuit board and the space for fixing the coil member can be accommodated in an overlapping position overlapping the coil component when seen from the top surface when the coil component is viewed from above. Therefore, the occupied space becomes smaller than providing these spaces separately in the circuit board. Thereby, the area of a circuit board can be used effectively.

  Further, when the coil component is disposed on the circuit board, the portion of the circuit board that is disposed at the overlapping position is most easily exposed to the heat of the coil component. On the other hand, according to said structure, a coil component and a heat radiating member can be fastened in the form which clamps this part. In other words, the portion of the circuit board that is exposed to heat can be directly held between the coil component and the heat dissipation member to physically suppress the warpage, thereby maintaining the contact state between the circuit board and the heat dissipation member, and the heat dissipation performance. And warpage due to heat can be suppressed.

  As an embodiment according to the technique disclosed in this specification, the following configuration is preferable.

  (1) The coil component and the heat dissipation member are fastened to each other at or near the center of the plate surface of the circuit board.

  For the convenience of wiring on the circuit board, it is preferable to place the coil component at the center of the plate surface of the circuit board. On the other hand, when the circuit board is warped, the center part is the most floating state from the heat radiating member. Is prone to decline. On the other hand, according to the above configuration, the coil component and the heat radiating member are fastened to each other in the center portion of the plate surface to sandwich the circuit board, so that the center portion of the plate surface of the circuit board is prevented from floating from the heat radiating member. Can do.

  (2) The electrical junction box is a water-cooled electrical junction box in which a water channel is provided inside the heat radiating member, and the water channel is constituted by the heat radiating member and an outer box into which the heat radiating member is fitted. The lower surface side of the heat radiating member has a shape that is recessed toward the upper surface side, and is formed below the concave strip portion between the two concave strip portions constituting the water channel and the two concave strip portions. And a sealing land portion that contacts the outer box over the entire periphery of the concave portion, and the fastening member penetrates the sealing land portion and is fastened to the coil component.

  When a water passage is provided in the heat radiating member to obtain a water cooling type, a higher heat radiating performance can be obtained as compared with the air cooling type. According to this configuration, since the water channel is provided through the sealed land portion when viewed from above, even if the fastening member is penetrated to the center overlapping position, the water channel does not penetrate the water channel, and thus there is a fear of causing inundation. Absent. Therefore, heat dissipation can be improved by making a circuit board contact also in a sealing land part, obtaining high heat dissipation performance by using a concave part as a water channel.

  (3) The coil component includes a coil case in which the coil is accommodated, and a fixed leg portion that protrudes downward from a lower surface of the coil case, and a screw that opens downward in the fixed leg portion. A hole is provided, and the fastening member is screwed into the screw hole from the heat radiating member side.

  According to this configuration, since the coil case can be lifted from the circuit board by the fixed leg portion, another electronic component is mounted at the overlapping position on the board (that is, between the circuit board and the coil case). be able to. Therefore, the circuit board can be downsized accordingly.

  Between the circuit board and the heat dissipating member, a heat dissipating auxiliary member for lowering thermal resistance is further provided.

  According to this configuration, the contact thermal resistance between the circuit board and the heat dissipation member can be improved.

  According to the electrical junction box according to the technique disclosed in the present specification, it is possible to secure the heat dissipation performance from the circuit board while arranging the coil on the circuit board, and to reduce the size of the entire electrical junction box.

The perspective view of the electric junction box of an embodiment Top view of electrical junction box Disassembled perspective view of electrical junction box Front view of coil parts Coil parts side view Bottom view of coil parts Top view of heat dissipation member The perspective view which looked at the heat dissipation member from the lower surface side Bottom view of heat dissipation member AA sectional view of FIG.

<Embodiment>
The embodiment will be described with reference to FIGS.

  The electrical junction box 1 of this embodiment is a water-cooled electrical junction box that is mounted in a vehicle and supplies electric power to a motor drive inverter. As shown in FIG. 3, the electrical junction box 1 includes a pair of coil components 10, a circuit board 20, a heat radiating member 30 constituting a water cooling mechanism, a plurality of screws 40 (an example of a fastening member 40), and FIG. 10. As shown in FIG. The coil component 10, the circuit board 20, and the heat radiating member 30 are integrally fastened by screws 40 to have a form shown in FIG. 1, and this is housed in a pair of upper and lower outer boxes 50. In the following description, the upper side in FIG. 1 is the upper side, and the near side in FIG. 2 is the front side. In the drawing, members having the same configuration are described with only one of them, and the other members may be omitted.

(Coil part 10)
As shown in FIG. 10, each coil component 10 includes a coil case 110 that is flat and has a substantially rectangular parallelepiped shape that is long on the left and right, a pair of upper and lower plate-like magnetic bodies 120, and a pair of left and right flat coils 130. Yes. The magnetic body 120 and the coil 130 are accommodated in the coil case 110.

  The pair of coils 130 are arranged close to the left and right side walls of the coil case 110 with their winding axes directed in the vertical direction, and are arranged side by side. The magnetic body 120 is disposed with a pair of coils 130 sandwiched from above and below.

  From the front surface of the coil case 110, as shown in FIG. 4, a total of two pairs of connection terminals 131 connected to each coil 130 are extended. Each connection terminal 131 is electrically connected to the circuit board 20 by soldering directly to a circuit (not shown) of the circuit board 20.

  As shown in FIG. 4, the coil case 110 is integrally provided with a pair of left and right fixed leg portions 111 (an example of a fastened portion). As shown in FIGS. 5 and 6, each fixed leg 111 extends downward from both left and right ends of the lower surface of the coil case 110. As shown in FIG. 4, each fixed leg portion 111 is provided within a range of an overlapping position where it overlaps with the coil 130 when viewed in the vertical direction, and as shown in FIG. 4, the coil component 10 (that is, the connection terminal 131). From the front end of the coil case 110 to the rear end of the coil case 110 in the front-and-rear direction, and projecting downward from a position slightly forward of the dividing line C1 (that is, the side where the connection terminal 131 is extended). As shown in FIG. 10, the fixed leg 111 is formed with a screw hole 112 extending vertically from the upper end to the lower end and opening downward. As shown in FIG. 10, the screw hole 112 has a bottomed shape with its upper end closed. Note that “provided within the range of the superposition position” means that at least a part of the superposition is provided at a position where the coil 130 is superposed when viewed in the vertical direction.

  As shown in FIG. 4, a pair of auxiliary leg portions 113 extends downward from the vicinity of the rear corner end on the lower surface of the coil case 110. As shown in FIG. 5, the lower end of the connection terminal 131, the lower end of the fixed leg portion 111, and the lower end of the auxiliary leg portion 113 are at the same height level.

(Circuit board 20)
As shown in FIG. 3, the circuit board 20 has a substantially rectangular flat plate shape that is long on the left and right. The circuit board 20 has four insertion holes 21 penetrating vertically. As shown in FIG. 2, each insertion hole 21 passes through a plate surface center point P (an example of a plate surface center portion) of the circuit board 20 and extends in parallel to the long side of the circuit board 20. They are lined up on the left and right at a position slightly further forward than an example of the central portion of the plate surface. The arrangement relationship in the front / rear / left / right direction of each insertion hole 21 is the same as the arrangement relationship in the front / rear / left / right direction of each fixed leg 111 of the coil case 110 when viewed from the upper surface side.

  The coil component 10 is disposed in the central portion of the plate surface on the upper surface of the circuit board 20 or in the vicinity thereof. Note that “disposed in the center of the plate surface of the circuit board 20” means that a dividing line (for example, the dividing line C1 described above) passing through the center of the coil case 110 when viewed from the upper surface side is a plate surface center point of the circuit board 20. The center line passing through P (for example, the above-described plate surface center line C2 or the plate surface center line C4 extending parallel to the short side of the circuit board 20 through the plate surface center line P) may be disposed. “Disposed near the center of the plate surface of the circuit board 20” means that the coil case 110 passes through the plate surface center point P of the circuit board 20 as viewed from the upper surface side (for example, the above-described plate surface center line C 2. Or, it is arranged at a position straddling the plate surface center line C4) extending in parallel to the short side of the circuit board 20 through the plate surface center line P. In the present embodiment, as shown in FIG. 2, the coil component 10 is disposed at a position where the dividing line C <b> 1 overlaps the plate surface center line C <b> 2 of the circuit board 20 in a top view (that is, the plate surface center portion). .

(Heat dissipation member 30)
The heat radiating member 30 is formed of a metal material having high thermal conductivity, and has a flat rectangular parallelepiped shape as shown in FIG. The heat radiating member 30 is provided with a substrate housing recess 31 that opens upward. Four support projections 32 having a flat cylindrical shape are provided on the bottom surface 31 </ b> B of the substrate housing recess 31. As shown in FIG. 7, each support protrusion 32 is formed with a through hole 321 through which the screw 40 is inserted. As shown in FIG. 7, the through holes 321 are arranged side by side at a position slightly forward of the recess center line C <b> 3 in the front-rear direction on the bottom surface 31 </ b> B of the substrate housing recess 31.

(Assembly procedure)
When assembling the electrical junction box 1 of this embodiment, as shown in FIG. 3, the circuit board 20 is housed in the board housing recess 31 of the heat dissipation member 30, and each coil component 10 is placed on the circuit board 20. The dividing line C 1 of the coil component 10 and the plate surface center line C 2 of the circuit board 20 are overlapped with the recess center line C 3 of the board housing recess 31. The screws 40 are inserted through the through holes 321 of the heat dissipation member 30 and the insertion holes 21 of the circuit board 20 in this order from below the heat dissipation member 30 and screwed into the screw holes 112 of the coil component 10.

  As a result, each coil component 10 is disposed at the center of the plate surface of the circuit board 20 as described above, and is fastened to the heat dissipation member 30 at the fixed leg 111 provided within the range of the above-described overlapping position. The The circuit board 20 has four support protrusions of the four fixed legs 111 of the coil component 10 and the heat radiating member 30 within a range of overlapping positions where the coil component 10 is superimposed on the coil component 10 when seen from above. The portion 32 comes into surface contact with and is held between them. Hereinafter, in this state, as indicated by a two-dot chain line in FIG. 3, the portion of the circuit board 20 that is disposed at the overlapping position is referred to as the overlapping substrate portion 20 </ b> A, and is disposed at the overlapping position of the heat dissipation member 30. This portion is referred to as a superimposed heat radiating portion 30A.

  When the electrical junction box 1 is energized, the entire circuit board 20 may be warped by heat. In that case, there is a concern that the plate surface center point P (see FIG. 2) of the circuit board 20 is the largest and floats up from the heat radiating member 30 and the heat radiating efficiency decreases. In the configuration of the present embodiment, the fixed leg 111 of the coil component 10 and the support protrusion 32 of the heat radiating member 30 are fastened with the screw 40 at a position closest to the plate surface center point P, and the fixed leg 111 and the heat radiating member are fixed. The superposed substrate portion 20 </ b> A is sandwiched by 30 support protrusions 32. Further, the four fixed legs 111 and the four support protrusions 32 sandwich the circuit board 20 linearly in the vicinity of the plate surface center line C <b> 2 of the circuit board 20. Thereby, the physical contact between the plate surface center point P (superimposed substrate portion 20A) and the heat dissipation member 30 (superimposed heat dissipation portion 30A) while physically suppressing that the plate surface center point P is lifted from the heat dissipation member 30. Warping itself around the plate center point P is reduced by maintaining the state and ensuring the heat radiation efficiency.

(Water cooling mechanism)
By the way, the electrical junction box 1 of embodiment employ | adopts the water cooling type thermal radiation mechanism as mentioned above. As shown in FIG. 10, the water channel WP is configured by the bottom 50A of the outer box 50 on the lower side of the electrical connection box 1 and the above-described heat radiating member 30 superimposed on the bottom 50A.

  Specifically, two openings 35 are provided at the right end of the heat dissipating member 30 in FIG. 9, and as shown in FIG. 8, a water intake port and a water discharge port are respectively provided. As shown in FIG. 3, a groove 33 is formed as an upper wall of the water channel WP. The groove portion 33 has a shape in which the lower surface side is recessed toward the upper surface side. As shown in FIG. 9, the groove 33 has two concave strips 331 which are arranged forward and backward with respect to each other and extend leftward and rightward, and two of the lower surfaces of the heat radiating member 30 at about １ ／ on the left end side in FIG. 9. And a connecting recess 332 that communicates the recess 331 in the front-rear direction. Thereby, the groove part 33 has comprised one groove | channel shape which bends in a U shape as a whole.

  In other words, the remaining part of the lower surface of the heat dissipation member 30 other than the groove part 33 is the sealed land part 34. The sealing land portion 34 is connected to the frame-shaped portion 341 left along the four sides and the separation portion 342 left at about 2/3 of the right end side between the two concave strip portions 331, The flat surfaces are flush with each other.

  As shown in FIG. 8, the above-described through-holes 321 are distributed in a frame-shaped portion 341 and a separation portion 342 and are arranged side by side, and pass through these vertically as described above. Specifically, among the through holes 321, the first through hole 321A at the left end is arranged in the frame-shaped portion 341, and the second through hole 321B, the third through hole 321C, and the fourth through hole 321D on the right side thereof are the separating portion 342. Is provided. That is, the first through hole 321 </ b> A and the second through hole 321 </ b> B are provided on both sides of the sealing land portion 34 with the coupling recess 332 interposed therebetween.

  As shown in FIG. 10, each through-hole 321 includes a screw head embedded recess 322 having a shape in which the sealing land portion 34 is recessed upward and having a diameter larger than that of the head of the screw 40 and a longer length. In a state where the screw 40 is inserted into the through hole 321 and screwed into the screw hole 112 of the coil component 10, the entire head 40 </ b> A of the screw 40 is fitted in the screw head embedded recess 322. It is in a state of being accommodated inside the portion 34.

  A rubber mounting recess 346 is formed in the sealing land portion 34. The rubber mounting recess 346 has a relatively thin and shallow groove shape that is recessed toward the upper surface side, and has an annular shape that surrounds the entire circumference of the groove portion 33. A rubber member (not shown) is fitted in the rubber mounting recess 346. In a state in which the heat radiating member 30 is fitted in the outer box 50, the rubber member is in contact with the bottom 50 </ b> A of the outer box 50 over the entire circumference, so that the water that has flowed into the groove portion 33 enters the sealed land portion 34. The water is stopped so as not to enter.

(Function and effect)
As described above, the electrical junction box 1 of the present embodiment includes the coil component 10 including the coil 130, the circuit board 20 on which the coil component 10 is disposed, the heat dissipation member 30 on which the circuit board 20 is disposed, A fastening member (screw 40) for fastening at least the coil component 10 and the heat dissipation member 30; the coil component 10, the circuit board 20, and the heat dissipation member 30 when the coil component 10 is viewed from above. The coil components 10 are superposed on each other at a superimposing position that overlaps the coil component 10 when seen from above, and the coil component 10 has a fastened portion (fixed leg portion 111) within the range of the superposed position. The substrate 20 is fastened to the heat radiating member 30 by the fastening member 40 so as to sandwich the substrate 20.

  According to this configuration, the space for arranging the coil component 10 on the circuit board 20 and the space for fixing the coil 130 member overlap with the coil component 10 when viewed from the top when the coil component 10 is viewed from above. Therefore, the space occupied in the circuit board 20 is smaller than that provided separately in the circuit board 20. Thereby, the area of the circuit board 20 can be used effectively.

  Further, when the coil component 10 is arranged on the circuit board 20, the portion of the circuit board 20 that is disposed at the overlapping position is most easily exposed to the heat of the coil component 10. On the other hand, according to said structure, the to-be-fastened part 111 and the heat radiating member 30 of the coil component 10 can be fastened in the form which clamps the circuit board 20 within the range of this superposition position. That is, a portion of the circuit board 20 that is exposed to heat can be directly sandwiched between the coil component 10 and the heat radiating member 30 to physically suppress warpage, and thereby the contact state between the circuit board 20 and the heat radiating member 30. Thus, heat dissipation performance can be ensured and warpage due to heat can be suppressed.

  The coil component 10 and the heat dissipation member 30 are fastened to each other at or near the center of the plate surface of the circuit board 20 (plate surface center point P, plate surface center line C2).

  For the convenience of wiring on the circuit board 20, the coil component 10 is preferably arranged at the center portions P and C <b> 2 of the circuit board 20. On the other hand, when the circuit board 20 is warped by heat, the center parts P and C <b> 2 are arranged. However, it becomes the state which floated from the heat radiating member 30 most, and heat dissipation efficiency tends to fall. On the other hand, according to the above configuration, the coil component 10 is clamped between the coil component 10 and the heat radiating member 30 at or near the center P, C2 of the plate surface. It is possible to prevent the center portions P and C2 of the plate surface from floating from the heat radiating member 30.

  The electrical junction box 1 is a water-cooled electrical junction box 1 in which a water channel WP is provided inside the heat radiation member 30, and the water channel WP is fitted with the heat radiation member 30 and the heat radiation member 30. The outer casing 50 is formed on the lower surface side of the heat dissipating member 30. The two concave strip portions 331 constituting the water channel WP are formed in a concave shape toward the upper surface side, and the two concave strip portions. A sealing land portion 34 that protrudes below the concave strip portion 331 and seals the concave strip portion 331 in contact with the outer box 50, and the fastening member 40 includes the sealing member 40. The coil part 10 is fastened through the land part 34.

  When the water path WP is provided in the heat radiating member 30 and is water-cooled, a higher heat radiating performance is obtained as compared with the air-cooled type. However, if the fastening member 40 penetrates the water path WP, it causes water infiltration. According to this configuration, the water channel WP is provided so as to penetrate the sealing land portion 34 when viewed from above, so that even if the fastening member 40 is penetrated to the center overlapping position, the water channel WP does not penetrate the water channel WP. There is no worry to cause. Therefore, heat dissipation can be improved by making the circuit board 20 contact also in the sealing land part 34, obtaining high heat dissipation performance by making the groove part 331 into the water channel WP.

  In addition, the coil component 10 includes a coil case 110 in which the coil 130 is accommodated, and a fixed leg 111 that protrudes from below the coil case 110 toward the circuit board 20. A screw hole 112 that opens downward is provided, and the fastening member 40 is screwed into the screw hole 112 from the heat radiating member 30 side.

  According to this configuration, since the coil case 110 can be lifted from the circuit board 20 by the fixed leg 111, another position is placed on the board (that is, between the circuit board 20 and the coil case 110). Electronic components can be mounted.

  In addition, a heat radiation auxiliary member that lowers the thermal resistance is further provided between the circuit board 20 and the heat radiation member 30.

  According to this configuration, the contact thermal resistance between the circuit board 20 and the heat dissipation member 30 can be improved.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings, and can be implemented in the following forms, for example.

  (1) In the embodiment described above, the dividing line C1 of the pair of coil components 10 and the plate surface center line C2 of the circuit board 20 are arranged so as to overlap the recess center line C3 of the board housing recess 31 of the heat dissipation member 30. The coil component 10 and the heat dissipating member 30 are fastened in the vicinity of the plate surface center line C2 of the substrate 20 (more specifically, in the vicinity of the plate surface center point P). The coil component and the heat radiating member do not necessarily have to be fastened in the vicinity of the center point P on the surface of the circuit board.

  (2) Although the water-cooled electric junction box 1 provided with the water channel WP is illustrated in the above embodiment, the heat radiating means is not limited to water cooling but may be air-cooled. In this case, since it is not necessary to provide a water channel, the freedom degree of the position which penetrates a fastening member in a heat radiating member increases.

  (3) In the above embodiment, the coil component 10 is configured to include the fixed leg portion 111, but the fixed leg portion is not necessarily provided. For example, a screw hole is provided inside the coil case, and the coil case is directly connected to the circuit. It is good also as a structure which is made to contact a board | substrate and fastens to a heat radiating member. In this case, it is possible to suppress the warp of the superimposed circuit portion over the entire lower surface of the coil case.

  (4) In the said embodiment, although the screw 40 was employ | adopted as a fastening member and it was set as the structure which screws 40 in the coil component 10 from the downward direction of the thermal radiation member 30, the structure of a fastening member is not restricted to this. For example, the screw shaft may be extended downward from the fixed leg portion of the coil component, inserted into the insertion hole of the circuit board and the through hole of the heat dissipation member, and fastened with a nut below the heat dissipation member.

  (5) In the above-described embodiment, the groove 33 has a configuration in which the two recessed strips 331 are connected by the connecting recess 332 to form a single groove. However, the shape of the groove 33 is not limited to this, for example, a connection It is good also as a structure which does not provide a recessed part but the two recessed strip parts make an independent water channel, respectively. Further, the number of the concave portions is not limited to two, and may be one or three or more. In short, when the water cooling type is adopted as the heat radiating member, the fastening member may be configured to penetrate the sealing land portion.

  (6) In the above-described embodiment, the circuit board 20 and the heat dissipation member 30 are fastened in direct contact by screwing, but the configuration is not limited thereto. For example, a heat radiation auxiliary member (for example, heat radiation grease or sheet) may be sandwiched between the circuit board 20 and the heat radiation member 30. In this case, improvement in contact thermal resistance between the circuit board 20 and the heat dissipation member 30 can be expected.

1: Electrical junction box 10: Coil component 110: Coil case 111: Fixed leg 112: Screw hole 130: Coil 20: Circuit board 30: Heat radiation member 321: Through hole 33: Groove 34: Sealing land 341: Frame shape Part 342: separation part 35: opening 40: screw (fastening member)
50: Outer box C2: Plate surface center line (central part)
P: Plate surface center point (central part)
WP: Channel

Claims (5)

A coil component having a coil;
A circuit board on which the coil component is disposed;
A heat dissipating member on which the circuit board is disposed;
A fastening member for fastening at least the coil component and the heat dissipation member,
The coil component, the circuit board, and the heat radiating member are superimposed on each other at an overlapping position that overlaps the coil component in a top perspective view of the coil component viewed from above.
The said coil components have a to-be-fastened part in the range of the said superimposition position, The said to-be-fastened part is the electrical junction box fastened by the said heat radiating member with the said fastening member in the form which clamps the said circuit board.   The electrical connection box according to claim 1, wherein the coil component and the heat dissipation member are fastened to each other at or near the center of the plate surface of the circuit board. The electrical junction box is a water-cooled electrical junction box in which a water channel is provided inside the heat dissipation member,
The water channel is constituted by the heat radiating member and an outer box into which the heat radiating member is fitted,
On the lower surface side of the heat radiating member, a shape recessed toward the upper surface side is formed, and the two concave strip portions constituting the water channel, and between the two concave strip portions, are lower than the concave strip portion. A sealing land portion that protrudes and contacts the outer box over the entire circumference of the concave portion,
The electrical connection box according to claim 1, wherein the fastening member penetrates through the sealing land portion and is fastened to the coil component. The coil component includes a coil case in which the coil is accommodated, and a fixed leg portion that protrudes downward from a lower surface of the coil case,
The fixed leg is provided with a screw hole that opens downward,
The electrical connection box according to any one of claims 1 to 3, wherein the fastening member is screwed into the screw hole from the heat radiating member side.   The electrical junction box according to claim 1, further comprising a heat radiation auxiliary member that lowers thermal resistance between the circuit board and the heat radiation member.

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