阅读说明：本技术 电连接箱 (Electrical connection box ) 是由 伊佐治优介 中川谦治 于 2020-04-27 设计创作，主要内容包括：提供能够简化电连接箱与外部设备之间的连接作业并且稳定地防止向壳体内的浸水的新的构造的电连接箱。电连接箱(10)包含：电路结构体(12),具有向外部设备连接的连接端子(18)；壳体(20),具有插通孔(44)并收容电路结构体(12)；中继端子(66),与连接端子(18)连接,并具有插通插通孔(44)而向壳体(20)外露出的外部连接部(76)；及密封部件(72),在插通孔(44)与中继端子(66)的相向面之间被压缩,而对插通孔(44)进行密封。(Provided is an electrical junction box of a new configuration capable of simplifying the connection work between the electrical junction box and an external device and stably preventing water from flooding into a housing. An electrical junction box (10) includes: a circuit structure (12) having a connection terminal (18) for connecting to an external device; a housing (20) having an insertion hole (44) and housing the circuit structure (12); a relay terminal (66) connected to the connection terminal (18) and having an external connection section (76) that is inserted through the insertion hole (44) and exposed to the outside of the housing (20); and a sealing member (72) that is compressed between the insertion hole (44) and the facing surface of the relay terminal (66) to seal the insertion hole (44).)

1. An electrical junction box comprising:

a circuit structure having a connection terminal for connecting to an external device;

a housing having an insertion hole and accommodating the circuit structure;

a relay terminal connected to the connection terminal and having an external connection portion inserted through the insertion hole and exposed to the outside of the housing; and

and a sealing member that is compressed between the insertion hole and a surface of the relay terminal facing each other to seal the insertion hole.

2. The electrical connection box of claim 1,

the relay terminal has a cylindrical shape and is inserted into the circular insertion hole, and the insertion hole is sealed by the annular sealing member attached to the outer peripheral surface of the relay terminal being in close contact with the inner peripheral surface of the insertion hole and the outer peripheral surface of the relay terminal.

3. The electrical connection box of claim 2,

one end surface in the axial direction of the cylindrical relay terminal is exposed to the outside of the housing, a screw hole for fastening a bolt is formed in a center opening of the one end surface in the axial direction, a mounting surface for a target side terminal is formed around the screw hole, and the external connection portion is constituted by the one end surface in the axial direction.

4. The electrical junction box according to any one of claims 1 to 3,

the housing has an annular groove that opens on an inner peripheral surface of the insertion hole, and the seal member is housed in the annular groove.

5. The electrical junction box according to any one of claims 1 to 4,

the pair of connection terminals are connected to the pair of relay terminals, respectively, the external connection portions of the pair of relay terminals are inserted through the pair of insertion holes provided in the housing, respectively, and are exposed to the outside of the housing,

the housing is provided with a cover member having an insulating wall between the pair of external connection portions and surrounding the external connection portions.

6. The electrical connection box according to any one of claims 1 to 5,

the housing includes:

a box-shaped housing main body having an opening; and

a cover body that covers the opening of the case body in a sealed state,

the cover body is provided with the insertion through hole.

Technical Field

The present disclosure relates to an electrical junction box having a waterproof function.

Background

As an electrical junction box mounted on an automobile, a structure having a waterproof function for preventing water from entering inside is widely used. For example, patent document 1 discloses a structure as follows: in an electrical connection box having a case body for housing a circuit structure composed of a plurality of electrical components and a cover for covering an opening of the case body, a peripheral wall of the case body has a specific double-wall structure. By this double wall construction, water is discharged to the outside of the housing while water is prevented from entering to the inside.

Patent document 2 discloses a structure as follows: a part where a target side terminal to be pressure-bonded to a wire harness extending from an external device is connected to a connection terminal provided on a circuit structure housed in a case prevents water from entering the case along the wire harness. Specifically, a rubber sheath is attached to a harness insertion hole provided in the housing, and a corrugated tube externally attached to the wire harness is fitted to the sheath in a concave-convex manner, whereby water is prevented from entering the housing through the harness insertion hole.

Documents of the prior art

Patent document 1: japanese patent laid-open No. 2014-27723

Patent document 2: japanese laid-open patent publication No. 2002-186133

Disclosure of Invention

Problems to be solved by the invention

In the structures of patent documents 1 and 2, in order to connect the conductive members connected to the external device to the connection terminals of the circuit structure housed in the case, it is necessary to first perform the connection work with the case opened, and then cover the opening of the case with the lid to secure the sealing property. Further, work for attaching a waterproof member such as a sheath is also performed in the insertion hole for drawing the conductive member to the outside of the case. Therefore, the number of steps required for connecting the electrical junction box to the external device increases, and the work becomes complicated. Further, the electrical junction box may have inconsistent sealing performance due to the operator using the cover, the sheath, or the like.

Therefore, an object is to provide an electrical junction box of a new configuration capable of simplifying a connection operation between the electrical junction box and an external device and stably preventing flooding into a housing.

Means for solving the problems

The electric connection box of the present disclosure includes: a circuit structure having a connection terminal for connecting to an external device; a housing having an insertion hole and accommodating the circuit structure; a relay terminal having one end connected to the connection terminal and the other end inserted through the insertion hole and exposed to the outside of the housing to form an external connection portion; and a sealing member compressed between the insertion hole and a surface of the relay terminal facing each other to seal the insertion hole.

Effects of the invention

According to the present disclosure, it is possible to simplify the connection work between the electrical junction box and the external device, and to stably prevent flooding into the housing.

Drawings

Fig. 1 is an exploded perspective view showing an electrical junction box according to embodiment 1 of the present disclosure.

Fig. 2 is an enlarged perspective view of an assembled state of the electrical junction box shown in fig. 1.

Fig. 3 is an enlarged sectional view of III-III in fig. 2.

Fig. 4 is an enlarged plan view of the housing main body shown in fig. 1.

Detailed Description

Description of embodiments of the present disclosure

First, embodiments of the present disclosure are listed for explanation.

(1) The electric connection box of the present disclosure includes: a circuit structure having a connection terminal for connecting to an external device; a housing having an insertion hole and accommodating the circuit structure; a relay terminal connected to the connection terminal and having an external connection portion inserted through the insertion hole and exposed to the outside of the housing; and a sealing member compressed between the insertion hole and a surface of the relay terminal facing each other to seal the insertion hole.

According to the electrical junction box of the present disclosure, a part of the relay terminal connected to the connection terminal of the circuit structure housed in the housing is exposed to the outside of the housing to constitute the external connection portion. Therefore, the work of connecting the electrical junction box and the external device is completed only by the work of connecting the energizing member of the external device to the external connection portion exposed to the outside of the housing of the electrical junction box. Therefore, the work of covering the opening of the case with the lid body to secure the sealing performance and the work of attaching the waterproof member to the insertion hole for drawing the electrical connection member to the outside of the case, which have been conventionally required, are not required, and the work of connecting the electrical junction box and the external device can be simplified.

A sealing member is compressed between the relay terminal and the facing surface of the insertion hole, and the sealing property of the insertion hole is also ensured. Further, since it is not necessary for the operator to open the housing or perform some operation in relation to the sealing member during the connection operation between the electrical junction box and the external device, there is no fear of inconsistency in the sealing performance caused by the operator, and it is possible to stably prevent the housing from being flooded with water.

(2) Preferably, the relay terminal has a cylindrical shape and is inserted into the circular insertion hole, and the insertion hole is sealed by the annular sealing member attached to the outer peripheral surface of the relay terminal being in close contact with the inner peripheral surface of the insertion hole and the outer peripheral surface of the relay terminal. By compressing the elastically deformable annular seal member between the cylindrical relay terminal inserted into the circular insertion hole and the facing surface of the insertion hole, the compressed state of the seal member can be made uniform over the entire circumference. As a result, the sealing member can be brought into close contact with the inner peripheral surface of the insertion hole and the outer peripheral surface of the relay terminal in a stable state, and the sealing performance can be effectively improved.

(3) Preferably, in the above (2), one axial end surface of the cylindrical relay terminal is exposed to the outside of the housing, a screw hole for fastening a bolt is formed in a center of the one axial end surface, a mounting surface for a target side terminal is formed around the screw hole, and the one axial end surface constitutes the external connection portion. The screw hole for fastening the bolt and the mounting surface of the objective terminal can be efficiently provided in space by the axial end surface of the cylindrical relay terminal. Further, the object-side terminal is bolt-fastened to the relay terminal, whereby the connection structure capable of coping with a high voltage can be obtained, and the structure of the present disclosure can be effectively applied to an electrical junction box for a high voltage.

(4) Preferably, the housing has an annular groove that opens on an inner peripheral surface of the insertion hole, and the seal member is accommodated in the annular groove. The sealing member can be easily positioned and arranged by the annular groove. When the seal member is compressed between the relay terminal and the facing surface of the insertion hole, the seal member is also compressed by the bottom wall of the annular groove that opens on the inner surface of the insertion hole. Thereby, further waterproofness of the electrical junction box can be ensured.

(5) Preferably, the pair of connection terminals and the pair of relay terminals are connected to each other, the external connection portions of the pair of relay terminals are inserted through the pair of insertion holes provided in the housing and exposed to the outside of the housing, and the housing is attached with a cover member having an insulating wall between the pair of external connection portions and surrounding the external connection portions. This is because the cover member provided separately from the housing can easily provide the insulating wall between the pair of external connection portions and the wall portion surrounding the periphery of each external connection portion with respect to the housing. This also makes it possible to easily provide insulation between the external connection portions, prevent unnecessary contact between each external connection portion and another member, and the like.

(6) Preferably, the housing includes: a box-shaped housing main body having an opening; and a cover body that covers the opening of the housing main body in a sealed state, the cover body being provided with the insertion hole. This makes it possible to easily assemble the circuit structure from the opening of the case main body. Further, since the cover body that covers the opening in a sealed state is provided with the insertion hole, the external connection portion can be exposed to the outside of the case while maintaining the waterproof property inside the case.

< details of embodiments of the present disclosure >

Specific examples of the electrical junction box of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to these examples, but is defined by the claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

< embodiment 1 >

Hereinafter, embodiment 1 of the present disclosure will be described with reference to fig. 1 to 4. The electrical junction box 10 is mounted on a vehicle (not shown) such as an electric vehicle or a hybrid vehicle, for example, and functions as a safety device. The electrical junction box 10 uses, for example, a battery as a running battery that supplies electric power to a motor that runs a vehicle, and is used to connect the running battery to a vehicle-side load via a circuit structure 12 shown in fig. 1. The electrical junction box 10 can be arranged in any direction, but hereinafter, the Z direction is described as the upper direction, the Y direction is described as the front direction, and the X direction is described as the right direction. In addition, in the case of a plurality of identical components, reference numerals are given to only some of the components, and reference numerals are omitted in some cases for other components.

< Circuit Structure 12 >

For example, as shown in fig. 1, the circuit structure 12 includes a relay unit 14 having a precharge circuit, and connection terminals 18 electrically connected to a pair of input/output electrodes 16, 16 of the relay unit 14, respectively. One connection terminal 18 of the circuit structure 12 is electrically connected to an output side of a battery, which is an unillustrated external device that supplies electric power to a motor that runs the vehicle. The other connection terminal 18 of the circuit structure 12 is electrically connected to a vehicle-side load, which is an external device not shown.

The connection terminal 18 is formed by press-working a metal plate material into a substantially rectangular shape. As the metal constituting the connection terminal 18, a metal having a low resistance, such as copper, a copper alloy, aluminum, or an aluminum alloy, can be appropriately selected. The connection terminals 18 are threaded into the pair of input/output electrodes 16, 16 of the relay unit 14 through holes 19 formed in the rear end side. As a result, the rear end side of the connection terminal 18 is disposed on the upper surface of the relay unit 14, and the front end side of the connection terminal 18 extends forward from the upper surface of the relay unit 14.

< Relay unit 14 >

A main relay, not shown, that electrically connects the output side of the battery to the vehicle-side load is housed inside the relay unit 14. A precharge relay not shown and a precharge circuit in which precharge resistors are connected in series so as to bypass the main relay are connected to the main relay. Since the vehicle-side load includes a large-capacity capacitor having a capacitance of 200 μ F to 5000 μ F, for example, when the main relay is switched to the on state in a state where the capacitor is completely discharged, an extremely large charging current instantaneously flows to charge the capacitor. Since an extremely large charging current causes damage to the connection portion of the main relay, a precharge circuit is provided to prevent a disadvantage caused by the charging current. The main relay and the precharge relay are both relays that move the movable connection unit in the energized state of the exciting coil to switch the connection unit on/off, and are on/off controlled by a control circuit not shown.

< Electrical junction box 10 >

As shown in fig. 1, for example, the electrical junction box 10 includes: circuit structure 12, relay terminal 66 electrically connected to connection terminal 18 of circuit structure 12, case 20 for housing circuit structure 12, and sealing member 72 for sealing insertion hole 44 for exposing relay terminal 66 to the outside of case 20.

< housing 20 >

The housing 20 has: a box-shaped case body 24 having an upper opening 22; the lid 26 covers the upper opening 22 in a sealed state. The case body 24 and the lid body 26 are separate bodies, and are each formed by injection molding insulating synthetic resin into a predetermined shape. The synthetic resin constituting the case body 24 and the lid 26 may contain a filler such as glass fiber.

< housing main body 24 >

For example, as shown in fig. 1 and 4, the case main body 24 has a substantially rectangular box shape that is open upward as a whole, and includes a bottom wall 28 and a peripheral wall 30 that projects upward from an end edge portion of the bottom wall 28. In embodiment 1 of the present disclosure, the outer shape of the case 20 is substantially rectangular when viewed from above. The outer shape of the case 20 is not limited to the shape of the present embodiment.

As shown in fig. 1, 2, and 4, a substantially rectangular block-shaped fixing portion 32 is provided at 6 positions along the circumferential direction on the upper end portion of the peripheral wall 30 of the housing main body 24 so as to protrude outward. Further, a groove opening upward is formed on the upper surface of the peripheral wall 30 of the housing body 24 over the entire periphery of the peripheral wall 30, and a frame-like waterproof member 34 is attached to the groove.

As shown in fig. 4, a relay unit base 36 projecting upward in a substantially rectangular shape is provided on the rear side of the bottom wall 28 of the housing main body 24. As shown in fig. 1 and 4, three quadrangular prism-shaped connection terminal support portions 38 are provided on the front side of the bottom wall 28 of the housing main body 24, and the three quadrangular prism-shaped connection terminal support portions 38 are arranged so as to protrude from the bottom wall 28 by a height dimension slightly less than the upper opening portion 22, are connected to the peripheral wall 30, and are spaced apart in the longitudinal direction. One or two L-shaped ribs 40 are provided on the upper surface of the connection terminal support portion 38, and the corner portion of the connection terminal 18 on the tip end side extending forward from the upper surface of the relay unit 14 is accommodated and held inside the rib 40. In addition, the fixing portions 32 are all integrally formed with the case main body 24.

< cover 26 >

For example, as shown in fig. 1 and 2, the lid 26 has a substantially rectangular flat plate shape. At 6 positions corresponding to the fixing portions 32 of the case body 24, substantially barrel-shaped fixed portions 42 are provided projecting outward at the outer peripheral edge portion of the lid body 26. A pair of insertion holes 44, 44 having a circular cross section and penetrating in the plate thickness direction are arranged at a distance from the front side of the lid body 26. A double wall 46 having a cylindrical shape is provided to protrude upward at the peripheral edge of the insertion hole 44. As for the inner wall 46A of the double wall 46, the lower end portion has the same inner diameter as the insertion hole 44, and the upper end portion has a larger inner diameter than the insertion hole 44. Thus, a step is formed between the lower end portion and the upper end portion, and an annular groove 48 that opens on the inner circumferential surface of the insertion hole 44 is provided by the step. As will be described later, an annular seal member 72 is housed in the annular groove 48.

As shown in fig. 1 and 3, engaging projections 50 are provided on the outer wall 46B of the double wall 46 so as to protrude from the outer peripheral surface on the right side of the outer wall 46B of the right insertion hole 44 and the outer peripheral surface on the left side of the outer wall 46B of the left insertion hole 44. Further, a substantially rectangular plate-shaped insulating wall portion 52 is provided between the pair of insertion holes 44, 44 in a protruding manner. Further, an object-side terminal support portion 54 that opens upward and extends outward is provided on the outer peripheral edge portion of the lid body 26 adjacent to the pair of insertion holes 44, 44. Guide walls 56 are projected from both sides of the target-side terminal support portion 54 and the rear side of the double wall 46.

The cover member 58 is assembled from above to the double wall 46 provided in the pair of insertion holes 44, 44. The cover member 58 is configured by coupling a pair of annular portions 60, 60 on the outer wall 46B covering the double wall 46 by a door-shaped insulating wall 62. Engaged frame bodies 64 are provided to protrude downward at both ends in the longitudinal direction of the cover member 58.

< Relay terminal 66 >

For example, as shown in fig. 1, the relay terminal 66 is made of a metal having a cylindrical shape and has an outer diameter slightly smaller than the diameter of the insertion hole 44. The relay terminal 66 is formed by cutting or the like. As the metal constituting the relay terminal 66, a metal having a low resistance, such as copper, a copper alloy, aluminum, or an aluminum alloy, can be appropriately selected. The relay terminal 66 has a screw hole 68 for fastening a bolt formed in the center of both axial end surfaces. In the present embodiment, the screw holes 68 formed in both end surfaces in the axial direction of the relay terminal 66 do not communicate with each other, but may communicate with each other.

< assembling Process of Electrical junction Box 10 >

Next, an example of an assembling process of the electrical junction box 10 will be described. The assembling process of the electrical junction box 10 is not limited to the following description.

First, the relay unit 14 is prepared. Next, the pair of relay terminals 66 and 66 are fixed to the through holes 19 formed on the front sides of the pair of connection terminals 18 and 18 by using screws 70. Thereby, the pair of relay terminals 66, 66 are connected to the pair of connection terminals 18, respectively. The pair of connection terminals 18 and 18 are screwed to the pair of input/output electrodes 16 and 16 of the relay unit 14 through the through-hole 19 formed on the rear side, and the relay terminal 66 is electrically connected to the relay unit 14, thereby completing the circuit structure 12.

The circuit structure 12 to which the relay terminal 66 is connected is housed in the case main body 24. Thus, the relay unit 14 is placed on the relay unit base 36, and the corner portion of the tip end side of the connection terminal 18 extending forward from the upper surface of the relay unit 14 is accommodated inside the protrusion 40 provided in the connection terminal support portion 38. In this state, the heads of the screws 70 screwing the pair of relay terminals 66, 66 to the pair of connection terminals 18, 18 are efficiently housed in space by the space between the connection terminal support portions 38, and space saving is achieved. The pair of connection terminals 18, 18 extend outward from the relay unit 14 to have a size equal to that of a connection terminal support portion 38 provided on the peripheral wall 30 of the housing main body 24 and spaced apart from the relay unit 14. The area of the upper opening 22 of the case main body 24 is expanded to substantially cover the same.

Next, the lid 26 is prepared. That is, the sealing member 72 is inserted into the annular groove 48, and the annular groove 48 is provided on the inner wall 46A of the double wall 46 protruding from the peripheral edge portions of the pair of insertion holes 44, 44 of the lid body 26. Next, the cover member 58 is assembled from above to the double wall 46 provided in the pair of insertion holes 44, 44. Thus, the upper side of the annular groove 48 for accommodating the seal member 72 is covered with the cover member 58, and the seal member 72 is prevented from falling off from the annular groove 48.

The lid 26 configured as described above covers the upper opening 22 of the case body 24, and the fixed portion 42 of the lid 26 is fastened and fixed to the fixing portion 32 provided at the upper end portion of the peripheral wall 30 of the case body 24. As a result, the waterproof member 34 disposed in the groove formed in the upper surface of the peripheral wall 30 of the case main body 24 is pressed between the case main body 24 and the lid 26, and thereby the upper opening 22 of the case main body 24 is covered with the lid 26 in a sealed state.

In this state, as shown in fig. 3, one end surface of the cylindrical relay terminal 66 in the axial direction is inserted through the insertion hole 44 of the lid 26 constituting the housing 20 and is exposed to the outside from the annular portion 60 constituting the cover member 58. A screw hole 68 for fastening a bolt is formed in the center of the one end surface in the axial direction so as to open upward, and a mounting surface on which a target side terminal 78 described later is mounted is formed around the screw hole 68. That is, the outer connection portion 76 is formed by one end surface in the axial direction. As shown in fig. 3, the cover member 58 has an insulating wall 62 projecting between the pair of external connection portions 76, and surrounds the periphery of each external connection portion 76.

As shown in fig. 1 and 3, an annular seal member 72 is attached to the outer peripheral surface of the relay terminal 66 having a cylindrical shape and inserted into the circular insertion hole 44. The sealing member 72 is compressed in close contact with the inner peripheral surface of the insertion hole 44 and the outer peripheral surface of the relay terminal 66, thereby sealing the insertion hole 44. Thus, the electrical junction box 10 is formed.

Finally, the insulating coating portion 78A of the target side terminal 78 having the sheet-like terminal exposed at the end thereof is placed on the target side terminal support portion 54, and the sheet-like connection portion 78B of the target side terminal 78 is placed on one end surface (the external connection portion 76) in the axial direction of the relay terminal 66 exposed from the insertion hole 44 of the cover 26 to the outside, and is fixed by the screw 70. Thereby, the electrical junction box 10 is electrically connected to an external device. Further, a recess formed on the insulating wall 62 of the cover member 58 on the side of the annular portion 60 is provided to prevent a tool for turning the screw 70 from hitting the insulating wall 62.

Next, the operation and effects of the present embodiment will be described. According to the present embodiment, the circuit structure 12 to which the relay terminal 66 is connected is housed in the case 20, and the external connection portion 76 formed by one end surface of the relay terminal 66 in the axial direction is exposed outside the case 20. As a result, the operation of connecting the electrical junction box 10 to an external device is completed only by placing the target side terminal 78 on one end surface (external connection portion 76) of the relay terminal 66 in the axial direction and fixing it with the screw 70. Therefore, the work of covering the opening of the case with the lid after connection, which has been conventionally required, to secure the sealing property, or the work of attaching the waterproof member to the insertion hole for drawing the electrical connection member to the outside of the case is not required, and the work of connecting the electrical junction box 10 to the external device can be simplified.

Further, the sealing member 72 is compressed in close contact with the inner peripheral surface of the insertion hole 44 and the outer peripheral surface of the relay terminal 66, thereby ensuring the sealing property of the insertion hole 44. Further, when the electrical junction box 10 is connected to an external device, it is not necessary for an operator to open the housing or perform some kind of work related to the sealing member. This prevents the operator from having a possibility of inconsistency in the sealing performance, and therefore, the housing 20 can be stably prevented from being soaked with water. The annular sealing member 72 is compressed by being in close contact with the inner peripheral surface of the insertion hole 44 and the outer peripheral surface of the relay terminal 66, thereby sealing the insertion hole 44. Thus, the compressed state of the seal member 72 can be made uniform over the entire circumference, so that the seal member 72 can be brought into close contact in a stable state, and the sealing performance can be effectively improved. Further, since the seal member 72 is accommodated in the annular groove 48, the seal member 72 can be easily positioned and arranged. Further, when the seal member 72 is compressed between the relay terminal 66 and the facing surface of the insertion hole 44, it is also compressed by the bottom wall of the annular groove 48, so that further waterproofness of the electrical junction box 10 can be ensured.

According to the present embodiment, one end surface in the axial direction of the relay terminal 66 exposed to the outside from the insertion hole 44 of the lid 26 constituting the housing 20 serves as the external connection portion 76 of the connection target side terminal 78. That is, the screw hole 68 for bolt fastening is opened at the center of one end surface (the external connection portion 76), and a mounting surface of the target-side terminal 78 is formed around the screw hole 68. This makes it possible to provide the mounting surfaces of the screw holes 68 for bolt fastening and the target-side terminals 78 in a space-efficient manner. Further, since the connection work between the electrical junction box 10 and the external device is completed only by placing the target side terminal 78 on one end surface (the external connection portion 76) in the axial direction of the relay terminal 66 and fixing it with the screw 70, the connection structure of the present disclosure can be effectively applied to the electrical junction box for high voltage.

Further, since the case body 24 and the lid 26 are separate bodies, the circuit structure 12 and the relay terminal 66 can be easily accommodated from the upper opening 22 of the case body 24. Further, since the insertion hole 44 is provided in the lid 26 that covers the upper opening 22 in a sealed state, the external connection portion 76 can be exposed outside the case 20 while maintaining the waterproof property inside the case 20. Further, by using the cover member 58 provided separately from the housing 20, the insulating wall 62 can be easily provided between the pair of external connection portions 76, 76 or the periphery of each external connection portion 76 can be easily surrounded by the insulating wall 62. Therefore, it is also possible to easily provide insulation between the pair of external connection portions 76, prevent unnecessary contact between each external connection portion 76 and another member, and the like.

< modification example >

As described above, embodiment 1 has been described in detail as a specific example of the present disclosure, but the present disclosure is not limited to the specific description. Variations, improvements, and the like within a range in which the object of the present disclosure can be achieved are also included in the present disclosure. For example, the following modifications of the embodiments are also included in the technical scope of the present disclosure.

(1) In the above embodiment, the relay terminal 66 is connected to the connection terminal 18 by screwing, but may be fastened by other fastening members such as bolts and nuts, or by welding.

(2) Further, the circuit structure 12 is described by taking an example of a relay having a precharge circuit, but is not limited thereto. As the circuit structure 12, various known circuit structures can be used.

(3) Further, although the opening is provided above the housing 20, the opening may be provided on a side of the housing, and the external connection portion may protrude laterally.

(4) The shape of the relay terminal 66 is not limited to a cylindrical shape, and any shape such as a prismatic shape can be adopted. The insertion hole 44, the sealing member 72, and the like have shapes corresponding to the shapes of the relay terminals 66.

Description of the reference numerals

An electrical connection box

12

Relay unit

An input-output electrode

18

Through hole

A housing

22.. upper opening part

A housing body

Cover body

Bottom wall

A peripheral wall

A fixing part

A waterproof component

36.. a relay unit station

A connecting terminal support portion

Projecting strip

Fixed part

Inserting through hole

Double wall

Inner wall of 46a

46b

48.. annular groove

A snap-fit projection

Insulating wall section

Object side terminal support

56.. guide wall

58.. cover member

The annular part

Insulating wall

A clamped frame body

66.. Relay terminal

68.

Screw, and its making method

Sealing member

76.

78.. object side terminal

78A

A connecting portion.