JP2013240217A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box which prevents a cover from being released when being connected with the power source side.SOLUTION: An electric connection box 10 is formed by housing a circuit structure 10A, which includes: an input connector part 18 to which a power source side connector 11 is attached and receiving power supply; a circuit part 28 electrically connected with an input terminal 19 of the input connector part 18; and an output part 34 electrically connected with the circuit part 28 and outputting power to the exterior, in a case 36. The case 36 includes: a case body 37; and a cover 45 covering the case body 37. The cover 45 is provided with a protruding piece 49 that engages with the power source side connector 11 and restricts the release of the cover 45 when the power source side connector 11 is attached.

Description

  The present invention relates to an electrical junction box.

2. Description of the Related Art Conventionally, a technique in which a circuit that receives power supply from outside is housed in a case is known.
In Patent Document 1, an electronic device case in an electric device that receives power supply from a power plug is composed of a case main body and a cover, and a special tool is attached by fastening the case main body and the cover with a special screw. If not used, the cover cannot be opened. This prevents non-experts who do not have special tools from touching the inside of the case.

JP 2007-327555 A

  By the way, according to said structure, even if it is a non-professional, if there is a special tool, a cover can be opened. Therefore, even if connected to the power source, if there is a special tool, the cover can be opened, and there is a concern that an operator may accidentally touch a circuit to which power is supplied from the power source.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide an electrical junction box that can prevent the cover from being opened while being connected to the power source.

The present invention includes an input connector portion to which a power supply side connector is attached to receive power supply, a circuit portion that is electrically connected to an input terminal of the input connector portion, and an external connection that is electrically connected to the circuit portion. An electrical connection box in which a circuit structure including an output unit is housed in a case, and the case includes a case main body and a cover that covers the case main body. A feature is that an opening restricting portion is provided that engages with the power supply side connector to restrict the opening of the cover when the power supply side connector is attached.
According to this configuration, when the power supply side connector is attached, the opening restriction portion of the cover is engaged with the power supply side connector to restrict the opening of the cover. Thereby, it can prevent that a cover is open | released in the state connected with the power supply side.

In addition to the above configuration, the following configuration is preferable.
-The said opening control part is a protrusion which protrudes in the side by which the power supply side connector is mounted | worn.
For example, if the cover is provided with a concave portion as an opening restricting portion and the power supply side connector is provided with a convex portion that enters the concave portion of the cover, it is necessary to form the concave portion in the cover while maintaining the function of the cover to cover the circuit portion. The cover configuration tends to be complicated. According to this configuration, the opening restricting portion is a protruding portion that protrudes toward the side where the power supply side connector is mounted in the cover, and thus it is possible to provide the protruding portion without complicating the structure of the cover relatively. .

The power supply side connector includes a power supply side terminal and a hood portion that surrounds the power supply side terminal, and the protrusion is disposed inside the hood portion when the power supply side connector is attached. .
In this way, since the hood portion provided on the power supply side connector can be used to engage the opening restricting portion for the protection of the terminal, it is usually possible to simplify the configuration of the power supply side connector. It becomes possible to use the power supply side connector of the structure.

The protrusion is a plate-shaped protrusion, and the input connector portion includes the input terminal, and a cylindrical portion that surrounds the input terminal and is disposed inside the hood portion; The tubular portion is provided with a cutout portion into which the protruding piece is fitted by cutting out the tubular portion.
If it does in this way, it becomes possible to accommodate a protrusion in the part of a notch part.

-The said notch has penetrated the said cylindrical part.
If it does in this way, it will become possible to constitute a part of cylindrical part with a projecting piece.

-There are a plurality of protruding pieces.
If the protruding piece is thin according to the thickness of the cylindrical portion, it may be assumed that it is not easy to ensure the strength to restrict the opening of the cover. According to this configuration, since there are a plurality of projecting pieces, it is easy to ensure strength sufficient to restrict the opening of the cover.

-As for the said notch part, when the said protrusion is inserted, the outer surface side of the said protrusion and the outer surface side of the said cylindrical part become flush | planar.
Thus, it becomes easy to use the power supply side connector of the existing structure by making the outer surface side of a cylindrical part into the same surface.

-The cylindrical part has a pair of opposing walls extending in a direction along the surface of the circuit part, and a pair of side walls connecting the pair of opposing walls, and the notch part is provided on the opposing wall. The protrusion has a plate surface in a direction along the opposing wall.

-The cylindrical part has a pair of opposing walls extending in a direction along the surface of the circuit part, and a pair of side walls connecting the pair of opposing walls, and the notch is provided on the side wall. The projecting piece has a plate surface in a direction along the side wall.

The cover is screwed to the case body.
As a result, since the cover cannot be opened without a tool, it is possible to prevent problems caused by inadvertently opening the cover.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a cover is open | released in the state connected with the power supply side about the electrical junction box.

The perspective view which shows the state by which the power supply side connector was mounted | worn in the electrical junction box of Embodiment 1. FIG. The perspective view which shows the electric junction box of the state from which the power supply side connector was removed The perspective view which shows the state which removed the cover from the case main body Exploded perspective view of electrical junction box Top view showing the electrical junction box Front view showing the electrical junction box AA sectional view of FIG. BB sectional view of FIG. Top view showing the electrical junction box with the power supply side connector attached Front view showing the electrical junction box with the power connector attached CC sectional view of FIG. DD sectional view of FIG. The perspective view which shows the electrical-connection box of the state from which the power supply side connector of Embodiment 2 was removed. The perspective view which shows the state which removed the cover from the case main body

<Embodiment 1>
The electrical junction box 10 of Embodiment 1 is demonstrated referring FIG. 1 thru | or FIG.
The electric junction box 10 is mounted on a path from a battery (power source) to a load in a vehicle (not shown) such as an electric vehicle or a hybrid vehicle, and has a DC-DC converter function. In the following, the vertical direction will be described with reference to FIG. 12, and the front-rear direction will be described with the fitting direction of the power supply side connector 11 and the input connector portion 18 as the front and the direction opposite to the fitting direction as the rear (see FIG. That is, the electrical junction box 10 will be described assuming that the left side in FIG. 12 is the front side and the right side is the rear side.

As shown in FIG. 12, the electrical junction box 10 includes a circuit structure 10A and a case 36 that houses the circuit structure 10A.
As shown in FIG. 4, the circuit configuration body 10 </ b> A includes an input connector portion 18 to which the power supply side connector 11 is attached and receives power supply, and a circuit portion 28 that is electrically connected to the input terminal 19 of the input connector portion 18. And an output unit 34 that is electrically connected to the circuit unit 28 and outputs electric power to the outside, and a heat sink 35 that is disposed below the circuit unit 28 and dissipates heat from the circuit unit 28.

  As shown in FIG. 11, the power supply side connector 11 includes a terminal-attached electric wire 12 in which a power supply-side terminal is attached to the terminal portion of the electric wire (in FIG. 11, the overall schematic shape is indicated by a chain line), and a terminal-attached electric wire. And a connector main body 13 in which 12 is accommodated.

  The electric wire is a shielded electric wire, and includes a conductor portion, an insulating layer covering the periphery of the conductor portion, a shield layer formed of a braided wire covering the periphery of the insulating layer, and a sheath that is an insulating coating covering the periphery of the shield layer. The conductor portion has one end connected to a DC power source such as a battery and the other end connected to a power supply side terminal.

The power supply side terminal has a female terminal portion connected to the male input terminal 19 of the input connector portion 18 and a wire connection portion connected to the conductor portion of the electric wire.
The terminal portion is provided with an elastic contact piece for elastically holding the input terminal 19 inside a cylindrical member.

The wire connection portion is connected to a conductor portion (core wire) exposed at the end portion of the wire by a known connection means such as crimping.
The braided wire of the electric wire is caulked to a shield connecting portion made of a ring-shaped metal.

  The connector main body 13 has a housing 14 made of synthetic resin, and a shield terminal 13 </ b> A that connects between the shield connection portion of the terminal-attached electric wire 12 and the ground-side conductive path of the electric connection box 10.

The housing 14 has a fitting portion 15 that fits with the input connector portion 18 and an extending portion 17 that continues to the rear of the fitting portion 15, and has an insertion hole through which the terminal-attached electric wire 12 is inserted. .
The fitting portion 15 includes a holding portion 15A that holds the power supply side terminal, and a rectangular tube-shaped hood portion 15B that surrounds the holding portion 15A.

  A lock portion 16 is formed on the outer surface of the upper side of the hood portion 15B so as to be locked when the input connector portion 18 is mounted at a normal position. The lock portion 16 has a lock engaging portion 16A and a lock release portion 16B, and can be unlocked by pushing down the lock release portion 16B.

The input connector portion 18 includes an input terminal 19, a shield connection terminal 20, and a housing 21 made of synthetic resin.
The input terminal 19 is bent in an L shape on the rear side of the housing 21, and the tip portion bent upward is soldered to the through hole 30 of the circuit board 29 and connected to the conductive path.

The shield connection terminal 20 is connected to the heat sink 35 connected to the ground terminal 55 in the case 36.
The housing 21 includes a rectangular tubular portion 22 that surrounds the input terminal 19, and a back wall portion 27 that closes the tubular portion 22.

As shown in FIG. 6, the cylindrical portion 22 has a pair of upper and lower opposing walls 23A and 23C, and a pair of side walls 23B and 23D connecting the upper and lower opposing walls 23A and 23C.
The pair of upper and lower opposing walls 23A and 23C are both substantially flat, and a pair of guide protrusions 24 and a pair of guide protrusions are formed on the outer surface of the upper opposing wall 23A as shown in FIG. A lock projection 25 provided between the strips 24 and a pair of cutouts 26 and 26 provided on the side of the pair of guide projections 24 by cutting out the opposing wall 23A.

The pair of guide protrusions 24 both extend linearly in the front-rear direction, and guides the power supply side connector 11 in the fitting direction when the power supply side connector 11 is attached.
The lock projection 25 is provided on the outer surface on the front end side of the facing wall 23A and protrudes in a step shape from the outer surface of the facing wall 23A. The stepped portion engages with the lock locking portion 16A of the power supply side connector 11, The locked state is maintained against the force in the pulling direction of the power supply side connector 11.

The notches 26, 26 are provided outside the pair of guide protrusions 24 at the base end of the opposing wall 23A, and have a rectangular shape that is long in the front-rear direction. The notches 26 are provided so as to penetrate the facing wall 23A.
As shown in FIG. 11, the back wall portion 27 has an extending portion 27A extending to the rear side, and the input terminal 19 passing through the extending portion 27A is shield-connected to the conductive path of the circuit portion 28. The terminal 20 is connected to the heat sink 35.

The circuit unit 28 includes a circuit board 29 on which a conductive path (not shown) is formed by a printed wiring technique, a plurality of electronic components 31, a bus bar that forms the conductive path, and the like.
An electronic component 31 is mounted on the circuit board 29, and terminals of the electronic component 31 are connected to the conductive path and the through hole 30 by a known connection means such as soldering.

As shown in FIG. 4, a control signal input connector 51 is connected to the circuit board 29.
The plurality of electronic components 31 include a MOSFET 32, a transformer 33, and the like, and are electrically connected to the conductive path.

A heat sink 35 is disposed below the circuit unit 28.
The heat sink 35 is a metal heat radiating member, and the upper surface of the heat sink 35 is flat and has a large number of fins on the lower surface side, and has a function of radiating heat generated from the electronic component 31.
The heat sink 35 is provided with a fixing portion, and the input connector portion 18 is fixed with screws.

The output unit 34 is electrically connected to the conductive path and has an output terminal 34A protruding in a rod shape.
The output terminal 34A is disposed in the recess 50 of the case 36 and is exposed to the outside.

The case 36 includes a case main body 37 and a cover 45 that covers the case main body 37.
The case main body 37 is made of a synthetic resin and has a flat box shape with the upper side open. The case main body 37 accommodates a heat sink 35. On the left and right sides of the case body 37, openings 38 for releasing the heat dissipated from the heat sink 35 to the outside are provided.

As shown in FIG. 11, the case main body 37 includes a bottom body 39 in which a standing wall 41 is formed on the peripheral edge of the bottom plate 40, and a frame-shaped member 42 that is disposed above the bottom body 39 and is fitted to the standing wall 41. And having.
As shown in FIG. 3, a plurality of rectangular locking holes 41 </ b> A are formed through the standing wall 41 of the bottom plate 40.

  The frame-like member 42 includes an annular portion 43 and a plurality of fixing portions 44 that protrude outward from the peripheral edge of the annular portion 43.

The annular portion 43 is formed with a locking claw portion 43D that is locked in the locking hole 41A and holds the bottom body 39 and the frame-shaped member 42 in a fitted state.
As shown in FIG. 11, the annular portion 43 protrudes inwardly and comes into contact with a contact wall 43 </ b> A that contacts the upper surface of the heat sink 35, and a bend that locks the locked portion recessed in the heat sink 35 from below. A deformable locking piece 43B is provided. Thereby, the upper surface of the heat sink 35 abuts on the abutting wall 43A and the extending portion 27A of the input connector portion 18, and the lower side is engaged with the plurality of engaging pieces 43B and positioned.

The annular portion 43 is provided with a connector attachment portion 43C to which the input connector portion 18 is attached, and a plurality of cover locking portions 43E that are locked to the cover 45.
The cover locking portion 43E is provided on each side of the rectangular annular portion 43, and has a stepped portion that is locked to the inner wall of the cover 45 and an inclined surface that is guided to the inner wall of the cover 45.

The plurality of fixing portions 44 have fixing holes formed therethrough, and are fixed to a fixed portion (not shown) provided in the vehicle body by an attachment member (not shown). As shown in FIG. 4, a ground terminal 55 is provided on the bottom surface side of one fixing portion 44 on the front surface side, and is connected to the body of the vehicle.
The case body 37 is provided with a fastening portion 40A for fastening the circuit board 29 with screws.

  The cover 45 has a box shape with an open bottom, and has a substantially rectangular top plate portion 46 and a partition wall 47 extending downward from the periphery of the top plate portion 46. A portion where the output unit 34 is disposed is a concave portion 50 penetrating in a rectangular shape in the vertical direction. In the recess 50, the output terminal 34A of the output unit 34 is arranged outside in an exposed state.

  A receiving portion 48 curved in a concave shape along the outer surface shape of the cylindrical portion 22 is provided at a position corresponding to the input connector portion 18 on the front surface side in the partition wall 47. When the cover 45 is attached, almost no gap is formed between the outer surface of the cylindrical portion 22 and the receiving portion 48.

  The partition wall 47 is provided with locking receiving portions 47A on each of the four surfaces, and the cover locking portion 43E of the case main body 37 is locked to the step portion provided on the inner surface side of the locking receiving portion 47A. To lock. The partition wall 47 is formed in a frame shape on the outside of the recess 50, and the latch receiving portion 47A is also formed in this frame shape portion.

The peripheral edge of the receiving portion 48 slightly protrudes forward in a hook shape, and is provided with a protruding piece 49 (an example of an “opening restricting portion” and “protruding portion”) that protrudes forward from the edge of the receiving portion 48. ing.
The projecting piece 49 has a rectangular plate shape that is long in the front-rear direction, and its plate surface is in a direction along the horizontal direction. The size of the projecting piece 49 is substantially the same as that of the notches 26 and 26 of the cylindrical portion 22. It is the size that fits without any problems.

The thickness of the protruding piece 49 is substantially the same as the thickness of the cylindrical portion 22, and when the protruding piece 49 is fitted into the notches 26, 26, the outer surface of the protruding piece 49 is substantially the same as the outer surface of the cylindrical portion 22. It will be the same.
And when the power supply side connector 11 is attached to the input connector part 18, since the protrusion 49 is arranged inside the hood part 15B (FIG. 12), it is comprised so that the cover 45 cannot be removed.

Next, removal of the cover 45 will be described.
In a state where the power connector 11 is attached to the input connector portion 18 of the electrical connection box 10 and power is supplied from the power source side (FIG. 1), even if the cover 45 is to be removed, the protruding piece 49 of the cover 45 is outside. The cover 45 cannot be removed by engaging with the hood portion 15B.

  When removing the cover 45, the lock release portion 16B of the power supply side connector 11 is operated to release the lock, and the power supply side connector 11 is pulled and removed from the input connector portion 18 (FIG. 2).

Then, the cover 45 is removed. At this time, since the power supply side connector 11 is removed and no electric power is supplied from the power supply side, the worker can work safely.
After the work is completed, the cover 45 is put on the case body 37. And by attaching the power supply side connector 11 to the input connector part 18, electric power is supplied to the electrical connection box 10 from the power supply side.

According to the structure of the said embodiment, there exist the following effects.
(1) According to the present embodiment, when the power supply side connector 11 is attached, the protruding piece 49 (opening restricting portion) of the cover 45 engages with the power supply side connector 11 and the opening of the cover 45 is restricted. The Thereby, it can prevent that the cover 45 is open | released in the state connected with the power supply side.

(2) The opening restricting portion is a protruding portion that protrudes to the side where the power supply side connector 11 is mounted.
For example, when the cover 45 is provided with a concave portion as an opening restricting portion and the power supply side connector 11 is provided with a convex portion that enters the concave portion of the cover 45, the concave portion is provided in the cover 45 while maintaining the function of the cover 45 to cover the circuit portion 28. Since it needs to be formed, the structure of the cover 45 tends to be complicated. According to the present embodiment, the opening restricting portion is a protruding portion that protrudes toward the side where the power supply side connector 11 is mounted in the cover 45, and thus the protruding portion is provided without complicating the structure of the cover 45 relatively. Is possible.

(3) The power supply side connector 11 includes a power supply side terminal and a hood portion 15B that surrounds the power supply side terminal, and the protrusion 49 (protrusion portion) is formed when the power supply side connector 11 is attached. Arranged inside.
In this way, the hood portion 15B provided on the power supply side connector 11 for protecting the terminal can be normally used to engage the protruding piece 49 (opening restricting portion). It is possible to simplify the configuration and use a power supply side connector having an existing configuration.

(4) The protrusion is a plate-like protrusion 49, and the input connector portion 18 includes the input terminal 19, a cylindrical portion 22 that surrounds the input terminal 19 and is disposed inside the hood portion 15B, The cylindrical portion 22 is provided with notches 26 and 26 into which the projecting pieces 49 are fitted so as to cut out the cylindrical portion 22.
If it does in this way, it becomes possible to accommodate the protrusion 49 in the part of the notches 26 and 26. FIG.

(5) The notches 26, 26 penetrate the tubular portion 22.
If it does in this way, it will become possible to constitute a part of cylindrical part 22 with projection 49.

(6) There are a plurality of protruding pieces 49.
If the protruding piece 49 is thin according to the thickness of the cylindrical portion 22, it may be assumed that it is not easy to secure a strength sufficient to restrict the opening of the cover 45. According to the present embodiment, since there are a plurality of projecting pieces 49, it is easy to secure a strength sufficient to restrict the opening of the cover 45.

(7) The notches 26 and 26 are flush with the outer surface side of the projecting piece 49 and the outer surface side of the tubular portion 22 by fitting the projecting piece 49.
Thus, it becomes easy to use the power supply side connector 11 of the existing structure by making the outer surface side of the cylindrical part 22 flush.

<Embodiment 2>
A second embodiment will be described with reference to FIGS. In the following, the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the electrical connection box 10 of the first embodiment, the protruding piece 49 of the cover 45 is fitted into the upper facing wall 23A in the cylindrical portion 22 of the input connector portion 18, but the electrical connection box 56 of the second embodiment is The projecting pieces 54 of the cover 45 are fitted into the left and right side walls 23B and 23D of the cylindrical portion 22 of the input connector portion 18, respectively.

As shown in FIG. 14, notches 53 and 53 in which through-holes are formed by notching the side walls 23B and 23D from the side are provided at the base end portions of the side walls 23B and 23D of the cylindrical portion 22. .
The notches 53 and 53 have a rectangular shape that is long in the front-rear direction.

On the other hand, at the left and right ends of the receiving portion 48 of the cover 45, projecting pieces 54, 54 projecting forward are provided.
The projecting piece 54 has a rectangular plate shape that is long in the front-rear direction, and its plate surface is directed in the vertical direction, and the shape thereof is substantially the same as the shape of the notches 53 and 53 cut out from the cylindrical portion 22. Has been. Therefore, the upper side of the protruding piece 54 is slightly thin along the outer surface shape of the cylindrical portion 22. With this configuration, the projecting pieces 54 and 54 are fitted into the notches 53 and 53 with almost no gap, and the outer surface of the projecting piece 49 is substantially flush with the outer surface of the cylindrical portion 22.

  When the power supply side connector 11 is attached, the protrusions 54 and 54 are arranged inside the hood portion 15B. Therefore, even if the cover 45 is opened with the power supply side connector 11 attached, the protrusions 54 and 54 are provided. 54 is engaged with the hood portion 15B, and the cover 45 is prevented from being opened.

<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.
(1) In the above embodiment, the cover 45 is provided with the plate-like protruding piece 49 (54). However, the present invention is not limited to this, and for example, a protrusion having a shape other than the plate shape is provided. You may make it regulate opening. In addition, the number of the projecting pieces 49 (54) is two. However, the number is not limited to this, and may be one or three or more.

(2) In the above embodiment, the projecting piece 49 (54) of the cover 45 is engaged with the hood portion 15B of the power supply side connector 11 so that the opening of the cover 45 is restricted. For example, the power connector 11 may be provided with an engaged portion that engages with the cover 45 in addition to the hood portion 15B to restrict the opening of the cover 45.

(3) In the above embodiment, the protrusion (projection piece 49) is provided on the cover 45. However, the present invention is not limited to this, and a protrusion is provided on the power supply side connector 11 side, and the power supply side connector 11 is attached to the cover 45. In this case, an opening restricting portion including a concave portion that engages with the protrusion and restricts the opening of the cover 45 may be provided.

(4) The cover 45 may be screwed to the case body 37. Thereby, since the cover 45 cannot be opened without a tool, it is possible to prevent a problem caused by the careless opening of the cover 45.

DESCRIPTION OF SYMBOLS 10,56 ... Electric junction box 10A ... Circuit structure 11 ... Power supply side connector 12 ... Electric wire 15 with a terminal ... Fitting part 15B ... Hood part 18 ... Input connector part 19 ... Input terminal 21 ... Housing 22 ... Cylindrical part 23A, 23C ... Pair of opposing walls 23B, 23D ... Pair of side walls 26, 53 ... Notch 28 ... Circuit part 29 ... Circuit board 31 ... Electronic component 34 ... Output part 34A ... Output terminal 35 ... Heat sink 36 ... Case 37 ... Case body 39 ... bottom body 40A ... fastening part 42 ... frame-like member 45 ... cover 49, 54 ... projecting piece (opening restricting part, projecting part)
50 ... recess

Claims (10)

An input connector portion to which power is supplied and a power supply is supplied, a circuit portion that is electrically connected to an input terminal of the input connector portion, and an electric power that is electrically connected to the circuit portion and outputs to the outside An electrical connection box in which a circuit structure including an output unit is housed in a case,
The case includes a case main body and a cover that covers the case main body,
The electrical connection box, wherein the cover is provided with an opening restriction portion that engages with the power supply side connector and restricts the opening of the cover when the power supply side connector is attached. The electrical connection box according to claim 1, wherein the opening restricting portion is a protruding portion that protrudes toward a side on which a power supply side connector is mounted. The power supply side connector includes a power supply side terminal and a hood portion surrounding the power supply side terminal,
The electrical connection box according to claim 1, wherein the protrusion is disposed inside the hood portion when the power supply side connector is attached. The protrusion is a plate-shaped protrusion,
The input connector portion includes the input terminal, and a cylindrical portion that surrounds the input terminal and is disposed inside the hood portion,
The electrical connection box according to claim 3, wherein the tubular portion is provided with a cutout portion into which the protruding piece is fitted to cut out the tubular portion. The electrical connection box according to claim 4, wherein the cutout portion penetrates the cylindrical portion. The electrical junction box according to claim 4, wherein the projecting pieces are plural. 7. The cutout portion according to any one of claims 4 to 6, wherein when the projecting piece is fitted, the outer surface side of the projecting piece and the outer surface side of the cylindrical portion are flush with each other. Electrical connection box as described in. The cylindrical part has a pair of opposing walls extending in a direction along the surface of the circuit part and a pair of side walls connecting the pair of opposing walls, and the notch part is provided on the opposing wall. The electrical connection box according to claim 4, wherein the protruding piece has a plate surface in a direction along the opposing wall. The cylindrical part has a pair of opposing walls extending in a direction along the surface of the circuit part and a pair of side walls connecting the pair of opposing walls, and the notch part is provided on the side wall. The electrical connection box according to claim 4, wherein the protruding piece has a plate surface in a direction along the side wall. The electrical junction box according to any one of claims 1 to 9, wherein the cover is screwed to the case main body.

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