JP2001359224A - Junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thin a junction box by reducing the number of layers of bus-bars inside the junction box. SOLUTION: A connector connecting circuit portion, a fuse-connecting circuit portion, and/or a relay-connecting circuit portion to be put in the upper case and lower case of the junction box are divided, and they are provided separately as a connector module, a fuse module, and a relay module. Each module has construction having bus-bars on an insulating board. To the connector connecting bus-bars of the connector module, the bus-bars as fuses of the fuse module and/or bus-bars for relays of the relay module are connected through welding. In the fuse module, welding tabs are arranged side by side on confronting sides. The welding tabs on the side of one side are set aligned in the vertical direction, and those on the side of the other side are set in the horizontal direction, and their directions of welding are orthogonal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a junction box for connecting to a wire harness for an automobile,
It is intended to reduce the thickness and size even if the number of circuits increases.

[0002]

2. Description of the Related Art In recent years, with the rapid increase of electrical components mounted on automobiles, the number of electric junction boxes for automobiles, especially the circuits accommodated in junction boxes, has rapidly increased, and branch circuits are formed at high density. In addition, the number of parts is very large, and the number of assembling steps is very large.

In a junction box 1 shown in FIG. 11 of the electric connection box for automobiles, bus bars 5A to 5D are stacked and arranged between upper case 2 and lower case 3 with insulating plates 4A to 4E interposed therebetween. The upper case 2 is provided with a connector accommodating portion 2a, a relay accommodating portion 2b, and a fuse accommodating portion 2c, and a connector 6, a relay 7, and a fuse 8 are mounted on these accommodating portions, and are protruded from these terminals and the bus bar. The tab is connected directly or via a relay terminal. The lower case 3 is also provided with a connector accommodating portion 3a, and the tab 5a of the bus bar projects to connect to the connector.

[0004]

In the junction box 1, there is a problem that the area of the bus bar and the number of laminations increase as the number of circuits increases, and the junction box becomes large. When a connector housing, a relay housing, and a fuse housing are provided in both the upper case and the lower case, and the connector, relay, fuse and the internal circuit are connected to the upper and lower surfaces of the junction box, the upper case or It is possible to suppress an increase in the area of the junction box as compared with a case where the junction box is provided only on one side of the lower case.

However, if the connector accommodating portion and the relay accommodating portion or the fuse accommodating portion are provided at the vertically opposed positions, the tabs bent by the bus bar overlap and cannot be developed. Therefore, it is necessary to provide the tab on the bus bar of another layer. This causes the number of layers to increase. As described above, when the number of layers of the bus bar increases, there is a problem that the height of the junction box increases and the size of the junction box increases.

Further, since the connector, the fuse, and the relay are connected to the bus bar in the junction box, if the specification changes to change the connection between the fuse, the relay and the internal circuit, the entire internal circuit is changed. Therefore, there is a problem that the circuit cannot be easily changed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is possible to suppress an increase in the number of bus bars accommodated in a junction box, thereby making it possible to reduce the thickness of the junction box, and to change a circuit. The task is to be able to easily deal with the problem.

[0008]

In order to solve the above-mentioned problems, the present invention divides a connector connection circuit section, a fuse connection circuit section and / or a relay connection circuit section accommodated in an upper case and a lower case of a junction box. The connector module is provided separately as a connector module, a fuse module, and a relay module, the connector module includes a connector connection bus bar that is stacked and arranged with an insulating plate interposed therebetween, and the fuse module is for a fuse fixed on the insulating plate. The relay module includes a bus bar. The relay module includes a relay bus bar fixed on an insulating plate. The fuse bus bar of the fuse module or / and the relay bus bar of the relay module is welded to the connector connection bus bar of the connector module. Doing things We provide a junction box characterized by the following.

As described above, in the junction box of the present invention, the connector connection circuit for connecting to an external electric wire via the connector, the fuse connection circuit and the relay connection circuit are divided into connector modules, fuse modules and relay modules. Are provided separately. That is, the bus bar for the base circuit for connecting the connector, the bus bar for the fuse, and the bus bar for the relay are provided separately.

Conventionally, one conductive plate is punched out to provide a connector connection circuit, a fuse connection circuit, and a relay connection circuit, and each of the circuits has a connector connection tab, a fuse connection tab, and a relay connection tab. This arrangement complicates the circuit layout, resulting in an increase in the area of the bus bar and an increase in the number of bus bars.
On the other hand, in the present invention, the bus bar for connector connection,
The bus bar for fuse connection and the bus bar for relay connection are divided and punched from separate conductive plates, and since they are arranged at different positions, the tabs do not overlap, so that the multilayering of the bus bar is suppressed, The junction box can be made thinner. In addition, since the circuit layout of each bus bar is also simplified, the area of each bus bar can be reduced.As a result, even if the bus bar is divided, the overall bus bar area can be reduced, and the increase in the junction box area can be suppressed. it can.

Further, since the connector module, the fuse module, and the relay module are provided separately, if any of the connector circuit, the fuse circuit, and the relay circuit is changed in specifications, the changed connector module, fuse module, It is only necessary to change the relay module, and it is possible to easily cope with the specification change.

The terminal of the bus bar for the connector is arranged directly or via a relay terminal in the connector accommodating portion provided in the upper case and / or the lower case, and the bus bar for the fuse of the fuse module and / or the relay for the relay module is provided. Terminal portions provided on the bus bar are arranged in a fuse housing portion and a relay housing portion provided in the upper case and / or the lower case.

That is, the connector module, the fuse module, and the relay module are housed in a case composed of a common upper case and a lower case, so that no space is required and the structure of each module is simplified. Can be. Inside the upper case and the lower case, for example, a fuse module is arranged on one upper side of the connector module, and a relay module is arranged on one side of the connector module in a direction orthogonal to the fuse module arrangement position.

The bus bar for the fuse and the bus bar for the relay are individually provided with a bus bar respectively connected to each terminal of the fuse and each terminal of the relay. Further, the bus bar for fuse and the bus bar for relay are bent from a horizontal portion fixed to an insulating plate to provide a terminal portion, a pressure contact groove is provided at a tip of the terminal portion, and the terminal portion is connected to an upper case and / or a lower case. The fuse accommodating portion provided, the fuse fitted into the relay accommodating portion, and the terminals of the relay are pressed and connected. The other ends of the bus bar for the fuse and the bus bar for the relay are connected to the welding tabs of the connector by welding with the welding tabs. With this configuration, the fuse bus bar and the relay bus bar can be connected without using a fuse and a relay terminal, respectively.

The welding tab at the end of the bus bar of the fuse module and / or the relay module is projected in parallel from two opposite sides of the insulating plate of each module, and the welding tab on one side is projected horizontally from the insulating plate. While welding with the welding tab of the connector connection bus bar projecting horizontally from the edge of the insulating plate of the connector module,
The welding tab on the other side is made to protrude in L shape from the insulating plate,
It is preferable that welding is performed on the welding tab of the connector connection bus bar projecting vertically from the insulating plate of the connector module so that the welding directions of the two opposing sides are orthogonal.

As described above, in the case of a fuse module and / or a relay module, particularly a fuse module having a large number of bus bars, if the welding tabs are set in parallel on two opposing sides, the size of the fuse module can be reduced. As a result, the size of the connector module can be reduced, and as a result, the size of the junction box can be reduced. Furthermore, if the welding directions of the two side welding tabs are set to horizontal and vertical, if the horizontal welding is performed after performing the vertical welding, the post-welding stress applied to the root of the vertical welding tab will be reduced. This can prevent the bases of the welding tabs from being deformed away from each other.

It is preferable that the welding tab of the bus bar for connecting the connector and the bus bar for connecting the fuse and / or the bus bar for connecting the relay has a small projection on one of the welding surfaces. In this way, if projections consisting of small projections are provided on the welding surface,
The small projections are welded so as to bite into the other surface, and the electrical connection reliability can be improved.

The connector connection bus bar, which is a base circuit of the connector module, and the welding tabs of the fuse bus bar and / or the relay bus bar are joined to each other and connected by ultrasonic welding, resistance welding or laser welding. ing.

As described above, the bus bar for connecting the connector and the bus bar for connecting the fuse and the relay are divided but welded, so that the reliability of the electrical connection does not decrease. When these welding tabs are arranged in parallel as described above, the ultrasonic welding, the resistance welding or the laser welding can be performed efficiently.

Although the fuse module and the relay module may be provided separately as described above, the fuse module and the relay module may be integrated to form a fuse / relay combined module. In this case, a bus bar for a fuse and a bus bar for a relay are fixed on a common insulating plate. When it is necessary to connect a circuit between the fuse bus bar and the relay bus bar, the bus bars of the circuit are connected by welding. Alternatively, a bus bar may be provided integrally.

An electronic control unit may be accommodated inside the upper case and the lower case. In that case, utilizing the dead space below the electronic control unit,
It is preferable to connect the welded portion between the connector connection bus bar and the fuse bus bar or / and the relay bus bar. Further, if necessary, a circuit including an electric wire and a press contact terminal and / or a circuit body such as an FPC and a PCB may be accommodated.

[0022]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic exploded perspective view of components constituting a junction box 10 connected to an automobile wire harness, and FIGS. 2 and 3 are cross-sectional views showing a state where the components are assembled.

In FIG. 1, 11 is a lower case, 12 is an upper case, 13 is a connector module, 14 is a fuse module, and 15 is a relay module. Inside the case composed of the lower case 11 and the upper case 12, a connector module 13, a fuse module 1
4. The relay module 15 is housed. Although not shown in FIG. 1 inside the case, FIGS.
The electronic control unit 40 is also accommodated as shown in FIG.

The lower case 11 has a connector housing 1
A large number of relay housings 1a are provided, and a plurality of relay accommodating portions 11b are provided in series on one side in the long side direction in the long side direction. The upper case 12 is provided with a fuse accommodating portion 12a on one side in the short side direction, and the rest hits the upper surface of the electronic control unit 40 and is a closed portion 12c. Also,
A connector housing 12e is provided on the peripheral wall on the other side in the short side direction. These lower case 11 and upper case 12
Means that the peripheral wall is fitted and locked, and the upper case 12 is provided with a bracket 12 for fixing the vehicle body.
d is protruding.

The connector module 13 is viewed from below as shown in FIG. 4, in which connector connecting bus bars 16 are vertically stacked via an insulating plate 17. In this embodiment, the connector bus bar is used. 16 has four layers. The connector module 13 shown in FIG. 1 is schematically illustrated with an insulating plate 17 disposed on the uppermost layer. In addition,
The bus bar 16 and the insulating plate 17 may be formed by resin-molding the bus bar 16 to form the insulating plate 17 and integrally form the multilayer bus bar 16.

Each layer of the connector connecting bus bar 16 of the connector module 13 is formed by punching a single conductive plate to form a circuit portion 16a having a required shape. The circuit section 16
A tab 16b protruding from the lower case 11 toward the lower case 11 is provided so as to protrude from the terminal hole 11c of the connector accommodating portion 11a provided in the lower case 11. A connector (not shown) connected to the distal end of the wire harness is fitted into the connector accommodating portion 11a to connect the terminal in the connector to the tab 16b.

The required circuit portion 16a of the connector bus bar 16 is provided with welding tabs 16c and 16d projecting from holes in the insulating plate 17, and welding tabs 16e projecting from the peripheral edge of the insulating plate 17. The welding tabs 16c and 16e are provided on the fuse bus bar 2 provided on the fuse module 14.
The welding tab 16d is a welding tab with the relay bus bar 30 provided in the relay module 15.

That is, the welding tabs 16c and 16d are the welding tab 20a of the fuse bus bar 20 and the relay bus bar 3
The welding tab 30a of No. 0 is vertically overlapped and welded. The welding tab 16e is also overlapped and welded to the welding tab 20b of the fuse bus bar 20 in the horizontal direction. These welding tabs 16c,
A large number 16d and 16e are protruded in parallel respectively.

The fuse module 14 has a configuration in which bus bars 20 for fuses are arranged between two insulating plates 22A and 22B, and the bus bars 20 are molded and formed. Each of the fuse bus bars 20 is individually provided with a component connected to each terminal of the fuse, and is composed of different bus bars. These many bus bars 20 for fuses
As shown in FIG. 5 (with the insulating plate removed), a terminal portion 20c is bent and protruded from one end of a horizontal portion 20e fixed to the substrate 21, and the terminal 25
A press contact groove 20d into which a is fitted is provided. The bus bar 2
The other end of 0 is the above-described welding tab 20a and welding tab 20b, which are bent stepwise so as to overlap the welding tabs 16c and 16e of the connector bus bar 16 in the vertical direction. A caulking rib may be provided on the insulating plate, a hole may be formed in the bus bar, the bus bar may be arranged through the rib in the hole, and the rib may be caulked and fixed.

The relay module 15 has substantially the same configuration as the fuse module 14, and includes upper and lower insulating plates 31A,
A large number of relay bus bars 30 are fixed between 31B, and these relay bus bars 30 are provided individually to be connected to the respective terminals of the relay, so that the bus bars are scattered. As shown in FIG. 6 (with the insulating plate removed), one end of a horizontal portion 30b fixed to the insulating plate is bent to protrude a terminal portion 30c. A press contact groove 30d into which the terminal 35a is fitted is provided. The other end of the bus bar 30 is connected to the welding tab 30a described above.
It is bent into an L shape, and is joined to the welding tab 16d of the connector bus bar 16 in the vertical direction.

When assembling the junction box 10 from the above components, first, the connector module 13
The fuse module 14 is arranged on the upper part of one side, and the welding tabs 20 a and 20 b of the bus bar 20 are overlapped and welded to the welding tabs 16 c and 16 e of the bus bar 16. Further, the relay module 15 is arranged on one side of the connector module 13, and the welding tab 30 a of the bus bar 30 is joined to the welding tab 16 d of the bus bar 16 and welded. This welding is performed by ultrasonic welding, resistance welding, or laser welding.

As described above, the fuse module 14 is mounted on the upper part of one short side of the connector module 13,
After arranging and integrating the relay module 15 on the side of the long side, these are accommodated in the lower case 11. At that time, the terminal 16b of the connector module 13 is located in the connector housing 11a, and the terminal 30c of the bus bar of the relay module 15 is located in the relay housing 11b.

Next, the electronic control unit 40 is mounted above the connector module 13 where the fuse module 14 is not mounted. The electronic control unit 40
The connector 44 is formed on one side of the connector 44 by bending a conductive pin 43 connected to the conductor 42 fixed to the substrate 41 and projecting it.
It has. Further, the conductor 42 of the electronic control unit 40 is connected to a tab 16 f projecting from the bus bar 16 of the base circuit unit 13. A large number of electronic components 45 are mounted on a board 41 of the electronic control unit 40 and connected to the conductor 42. These electronic components 45 are fixed to the substrate 41 so as to protrude downward. In addition, the bus bar 1
6, 20, 30 welding tabs are located in the dead space below the electronic control unit 40.

After assembling the electronic control unit 40 as described above, the upper case 12 is assembled. At this time, the fuse bus bar 20 fixed to the fuse module 14 is placed in the fuse accommodating portion 12a of the upper case 12.
Is disposed. Further, the connector section 44 of the electronic control unit 40 is fitted into the notch 12e. When the upper case 12 and the lower case 11 are locked and connected, the assembly of the junction box 10 is completed.

When the fuse 25 and the relay 35 are inserted into the junction box 10 into the fuse accommodating portion 11a and the relay accommodating portion 11b, respectively, they are fitted and connected to the press contact grooves 20d and 30d of the bus bars 20 and 30, respectively.

In the first embodiment, the fuse module and the relay module are provided separately. However, a composite module in which the fuse module and the relay module are integrated may be used. In that case, FIG.
As shown in (B), the upper case 12 'is provided with a fuse accommodating portion 12a' and a relay accommodating portion 12b 'in which terminal portions of bus bars provided in the composite module are located.
Further, the lower case 11 'is provided with only the connector accommodating portion 11a' where the terminal portion of the bus bar of the connector module is located.

FIGS. 8 to 10 show another embodiment. The fuse module 14 'has a two-layer structure, and fuse bus bars 20'-1 and 20'-2 are provided in each layer. The welding tab with the connector module is a rectangular insulating substrate 2
Projections 1'-1 and 21'-2 are juxtaposed to two opposite long sides, respectively, in parallel. The welding tabs 20a'-1 and 20a'-2 on one side are bent into an L shape and protruded upward in the same manner as in the above-described embodiment, and are arranged side by side without overlapping between the upper and lower layers. . On the other hand, the welding tabs 20b'-1 and 20b'-2 on the other side are not bent into an L-shape, but protrude in the horizontal direction, and are arranged side by side without overlapping between the upper and lower layers. In addition, the vertical welding tab 2
As shown in FIG. 10, small projections 20f 'are provided on the welding surfaces 0a'-1 and 20a'-2. Note that a small projection may be provided on the horizontal welding tab.

The vertically protruding welding tab 20
The a'-1 and 20a'-2 are joined to the welding tab 16c 'of the connector connection bus bar 16' projecting vertically upward from the middle part of the insulating board 17 'of the connector module 13'. The welding tabs 20b'-1 and 20b'-2 protruding in the horizontal direction are joined to welding tabs 16e 'protruding in the horizontal direction from one edge of the insulating substrate 17' of the connector module 13 '.

As shown in FIG. 9, the welding tabs of the fuse busbars of the fuse module and the connector connection busbars of the connector module are welded by welding tabs 20a'-1 and 20a which project vertically. '-
2 and 16c 'are resistance-welded first. Thereafter, the welding tabs 20b'-1, 20b'-2 and 1 protruded in the horizontal direction.
6e 'is resistance welded. During the welding in the vertical direction, the small projections 20f 'are welded so as to bite into the opposed welding surfaces.

As described above, when the resistance welding in the horizontal direction is performed after the resistance welding in the vertical direction, no stress is generated at the roots of the welding tabs in the vertical direction as shown in FIG. Therefore, the welding tabs in the vertical direction can be joined to the root portion.

The junction box of the present invention is not limited to the above embodiment, and the connector module, the fuse module, and the relay module are further divided into two.
Each of them may be composed of two divided modules. When the connector module, the fuse module, and the relay module are divided, when the specifications of the connector connection circuit, the fuse connection circuit, and the relay connection circuit are changed, only the changed module needs to be replaced. However, if it is divided too much, it takes time to assemble the connector module. Therefore, in a large junction box, it is preferable that each of the connector module, the fuse module, and the relay module is divided into about two.

A bus bar for connector connection of the connector module, a bus bar for fuse of the fuse module,
The welding pattern of the relay bus bar of the relay module has the following pattern according to the circuit design. Bus bar for connector connection and bus bar for fuse Bus bar for connector connection and bus bar for relay Bus bar for connector connection, bus bar for fuse, and bus bar for relay In this case, the welding tab at one end of the connector bus bar for one circuit The welding tab is welded, the welding tab of the relay bus bar is welded to the welding tab at the other end of the bus bar for the connector, and the tab provided on another portion of the bus bar for the connector is connected to the connector.

In the lower case and the upper case, not only the connector module, the fuse module, the relay module, and the electronic control unit, but also a circuit including an electric wire and a press contact terminal is provided. Alternatively, it may be configured to be connected to a connector fitted to the connector accommodating portion. Also, FPC,
A circuit body formed of a PCB and a conductor portion formed of a highly conductive resin and molded with an insulating resin may be provided as a base circuit portion.

[0044]

As is apparent from the above description, according to the junction box of the present invention, a connector module provided only with a bus bar for connector connection, a fuse module provided only with a bus bar for fuse connection, and a bus bar for relay connection Since the relay module with only the relay is provided separately and the bus bar is divided, the tab for connecting to the connector, fuse, relay is inevitably located at another position and does not overlap, as a result, the tab is provided Therefore, it is not necessary to increase the number of stacked bus bars. as a result,
The thickness of the junction box can be reduced.
For example, if the structure of the first embodiment is used, the structure that conventionally required six layers of bus bars can be reduced to four layers, and the junction box can be significantly thinned.

Further, since the bus bar is divided as described above, the layout of the bus bar circuit becomes simple and the required area can be reduced. As a result, even if the bus bars are divided and the ends of the bus bars are connected by welding, the occupied area does not increase as a whole, and the area of the junction box does not increase.

Further, if there is a change in the specifications of the connector connection circuit, the fuse connection circuit, and the relay connection circuit, only the connector module, the fuse module, the relay module whose specification has been changed, or a composite module thereof may be changed. Module, upper case, and lower case can be shared, so that it is possible to respond quickly and inexpensively to specification changes.

Further, the welding tabs of the bus bars of the fuse module and / or the relay module and the connector module are arranged side by side on two opposing sides of the insulating plate, and the welding tabs are vertically overlapped on one side. In this case, the fuse module and the relay module can be miniaturized and the connector module can be miniaturized accordingly, and the entire junction box can be miniaturized. In addition, generation of stress in the vertical welding tabs can be avoided, and the vertical welding tabs can be joined to each other up to the root, and as a result, electrical connection reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view of a junction box according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state where the junction box is assembled.

FIG. 3 is a cross-sectional view in a direction orthogonal to FIG.

FIG. 4 is a schematic perspective view of the connector module viewed from the bottom side.

FIG. 5 is a schematic view showing a fuse bus bar.

FIG. 6 is a schematic view showing a relay bus bar.

7A and 7B show another embodiment, in which FIG. 7A is a plan view and FIG.
Is a bottom view.

FIG. 8 shows another embodiment and is a plan view of each layer of a fuse module having a two-layer structure.

FIG. 9 is a schematic view showing a welded portion between the fuse module and the connector module of FIG. 8;

FIG. 10 is a view showing a joining state of a welded portion in a vertical direction.

FIG. 11 is an exploded perspective view showing a conventional junction box.

[Description of Signs] 10 Junction Box 11 Lower Case 11a Connector Housing 11b Relay Housing 12 Upper Case 12a Fuse Housing 13 Connector Module 14 Fuse Module 15 Relay Module 16 Connector Connection Bus Bar 16c, 16d, 16e Welding Tab 17 Insulating Plate 20 Bus bar for fuse 20a, 20b Welding tab 21 Insulating plate 25 Fuse 30 Bus bar for relay 30a Welding tab 31 Insulating plate 35 Relay 40 Electronic control unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norifumi Kobayashi 1-114 Nishisuehirocho, Yokkaichi-shi, Mie Sumitomo Wiring Systems Co., Ltd. (72) Koji Kasai 1-114 Nishisuehirocho, Yokkaichi-shi, Mie Sumitomo Wiring Systems Co., Ltd. (72) Inventor Yuji Osaka 1-14 Nishisuehirocho, Yokkaichi-shi, Mie F-term (reference) 5G361 BA04 BB02

Claims (8)

[Claims] 1. A connector connection circuit section, a fuse connection circuit section and / or a relay connection circuit section accommodated in an upper case and a lower case of a junction box are divided and provided separately as a connector module, a fuse module, and a relay module. The connector module includes a bus bar for connector connection that is stacked and arranged with an insulating plate interposed therebetween. The fuse module includes a bus bar for a fuse fixed on the insulating plate. The relay module is fixed on the insulating plate. A bus bar for relays is provided.
A junction box, wherein a fuse bus bar of a fuse module and / or a relay bus bar of a relay module are welded to each other. 2. The method according to claim 1, wherein the terminal of the connector bus bar is arranged directly or via a relay terminal in a connector accommodating portion provided in the upper case and / or the lower case, and a fuse bus bar of the fuse module and / or a relay module of the fuse module. 2. The junction box according to claim 1, wherein the terminal portion provided on the relay bus bar is arranged in a fuse accommodating portion and / or a relay accommodating portion provided on the upper case and / or the lower case. 3. 3. The fuse / relay module according to claim 1, wherein the fuse module and the relay module are integrated into a fuse / relay combined module, and the fuse bus bar and the relay bus bar are fixed on a common insulation. Junction box described in. 4. A welding tab is provided at an end of the bus bar for connector connection and the bus bar for fuse or / and the bus bar for relay, and these welding tabs are joined to each other.
The junction box according to any one of claims 1 to 3, wherein the junction box is connected by ultrasonic welding, resistance welding, or laser welding. 5. The bus bar according to claim 1, wherein the bus bar for the fuse and the bus bar for the relay are respectively provided with bus bars respectively connected to each terminal of the fuse and each terminal of the relay. Junction box. 6. The fuse module and / or the relay module are arranged on the upper surface and / or the lower surface of the connector module, and the welding tab provided at the tip of the bus bar of the fuse module and / or the relay module is opposed to the insulating plate of each module. The welding tabs on one side are projected horizontally from the insulating plate, and are welded to the welding tabs of the connector connection bus bar projecting horizontally from the edge of the insulating plate of the connector module. On the other hand, the welding tab on the other side is made to protrude in an L shape from the insulating plate, and is welded to the welding tab of the connector connection bus bar vertically protruding from the insulating plate of the connector module. Are orthogonal directions.
The junction box according to claim 5. 7. The welding tab according to claim 6, wherein the welding tab of the bus bar for connecting the connector and the bus bar for connecting the fuse and / or the bus bar for connecting the relay has a small protrusion on one of the welding surfaces. Junction box. 8. An electronic control unit is accommodated inside the upper case and the lower case, and a welded connection portion of the bus bar is arranged in a dead space below the electronic control unit. Item 8. The junction box according to any one of Items 7 to 7.