JP2001076784A - Connector structure and connector mounting method of flat circuit body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a multipolar connector in an intermediate part of a flat circuit body. SOLUTION: Plural wires 5 are exposed in a lengthwise intermediate part of a flat circuit body 1, shorter bus bars 2 are disposed by intersecting them with the upper sides of the wires, longer bus bars 3 are disposed by intersecting them with the lower sides of the wires, the respective bus bars 2, 3 are welded to the wires, and terminals 11, 12 of the respective bus bars are received in a connector housing 4. Insulation plates 6, 7 are disposed between the shorter bus bars 2 and the wires and between the longer bus bars 3 and the wires, respectively. The respective insulation plates have connection holes 16, 17 facing to the intersecting parts of the bus bars with the wires, and the respective bus bars are welded to the wires in the connection holes. Guide slots for the bus bars and guide slots for the wires are formed on the insulation plates 6, 7 in the intersecting direction. The wires 5 are welded to the longer bus bars in a region where the length of the shorter bus bars 2 is different from that of the longer bus bars 3. The number of the terminals 11, 12 of the bus bars 2, 3 is further increased by stacking a plurality of flat circuit bodies 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector structure and a connector assembling method for a flat circuit body in which a multi-pole connector is arranged in the middle of a flat circuit body arranged in a vehicle or the like.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show a conventional connector structure of a circuit body. This structure is a wire harness 3
The terminals 33 are crimp-connected to the plurality of electric wires 32 constituting the connector 1, respectively, and each terminal 33 is inserted into the connector housing 34 to form a multi-pole connector 35 (FIG. 9).

[0003] The connector housing 34 is formed of a synthetic resin, and has a plurality of terminal accommodating chambers 36 (FIG. 9) therein. The connector housing 34 of the present example has a hood 3 on the outside.
7 is a male type. The hood portion 37 is formed with a lock arm 38 for locking to a mating female connector housing (not shown). Food part 3
A waterproof packing 40 (FIG. 9) is provided between the housing 7 and the inner housing body 39. A flexible locking lance 41 for the terminal 33 is provided on the inner wall of the terminal accommodating chamber 36.
(FIG. 9) is formed to protrude.

The terminal 33 has a female electrical contact portion 42 on the front half side.
(FIG. 8), each has a wire crimping portion 43 on the rear half side. The electric wire crimping part 43 is composed of a pair of crimping pieces in each of front and rear,
The exposed conductor portion of the electric wire 32 is crimped to the front crimping piece, and the insulating coating of the electric wire 32 is crimped to the rear crimping piece. The terminal 33 is inserted into the terminal accommodating chamber 36 of the connector housing 39 after the wire 32 is crimped and connected, and is locked by the locking lance 41 without falling back.

[0005] The connector 35 is used, for example, for branching, and an electric wire (branch line) 32 is branched and connected to a trunk line (not shown) of the wire harness 31 by means of a joint terminal or welding. An electric wire (branch line) 32 is led out of each part in the longitudinal direction of the trunk line, and a connector 35 is connected to auxiliary equipment (not shown) such as electric components of the vehicle. The main line is connected to the power supply side. The main line and the branch line are wound with a vinyl tape and bundled, respectively, and are routed and fixed along a vehicle body, a door, an instrument panel, and the like (not shown).

[0006]

However, in the above-mentioned conventional structure, the wiring harness 31 is used as a circuit body.
, A large amount of wiring space on the vehicle side is required, and the wiring work is cumbersome.
There is a problem that a large number of man-hours are required for the operation of crimping the terminal and the operation of inserting the terminal 33 with the electric wire into the connector housing 34.

Therefore, although a technology for saving space on the assembly side by using a flat circuit body has been adopted,
When a flat circuit body is used, a technique for simply and surely arranging a connector at a desired position of the flat circuit body is required. In this case, it is needless to say that troublesome crimping work of the terminal and insertion work of the terminal with the electric wire must be unnecessary.

In view of the above, the present invention provides a connector structure and a connector assembling method of a flat circuit body in which a multi-pole connector can be easily and reliably arranged at a desired position of the flat circuit body. The purpose is to:

[0009]

In order to achieve the above object, according to the present invention, a plurality of electric wires are exposed at an intermediate portion in a longitudinal direction of a flat circuit body, and a short bus bar crosses over the electric wires. A flat circuit body connector, wherein a longer bus bar is arranged crossing the lower side of the electric wire, each bus bar is welded to the electric wire, and a terminal of each bus bar is housed in a connector housing. A structure is adopted (claim 1). Insulating plates are respectively arranged between the shorter bus bar and the electric wire and between the longer bus bar and the electric wire, and each insulating plate has a connection hole for an intersection between the bus bar and the electric wire, It is also effective that each bus bar is welded to the electric wire in the connection hole (claim 2). It is also effective that a guide groove for the bus bar and a guide groove for the electric wire are formed in each of the insulating plates in a direction crossing each other. Further, a plurality of wires are exposed at a longitudinally intermediate portion of the flat circuit body, a shorter bus bar on the connector side is arranged so as to cross the upper side of the wire, and the shorter bus bar is welded to the wire. And a longer bus bar on the connector side is disposed so as to cross the lower side of the connector, and the longer bus bar is welded to the electric wire. . The electric wire is welded to the longer bus bar in a range where the shorter bus bar and the longer bus bar have different lengths. It is also effective to arrange an insulating plate between the shorter bus bar and the electric wire and between the longer bus bar and the electric wire, and to weld each bus bar and the electric wire in a connection hole of the insulating plate. (Claim 6). It is also effective to accommodate the bus bar in a guide groove on one surface of the insulating plate and accommodate the electric wire in a guide groove on the other surface of the insulating plate. It is also possible to laminate a plurality of the flat circuit bodies to further multiply the terminals of the bus bar.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows one embodiment of a connector structure of a flat circuit body according to the present invention.

This structure is composed of a long flexible flat circuit body 1 and a conductive metal made of a metal which is arranged in two stages in the transverse direction of the flat circuit body 1 in the middle part of the flat circuit body 1 in the longitudinal direction. Bus bars 2 (2 ₁ to 2 ₃ ), 3 (3 ₁
To 3 ₃ ), a synthetic resin connector housing 4 for accommodating the distal ends of the bus bars 2 and 3, and a synthetic resin disposed between the bus bars 2 and 3 and the exposed electric wire (electric wire) 5 a of the flat circuit body 1. And two insulating plates 6 and 7.

The flat circuit body 1 is a semi-rigid one, and is composed of an elastic insulating substrate 8 made of synthetic rubber and an electric wire 5 buried inside the insulating substrate 8 and extending in the longitudinal direction. The insulating substrate 8 is peeled at important points in the longitudinal direction, and the electric wires 5a are exposed in parallel and are positioned in parallel. In the longitudinal direction and the width direction of the insulating substrate 8, a plurality of connection holes 9 for connecting a branch wire or the like (not shown) are provided.

The electric wire 5 is disposed inside the insulating substrate 8 by means such as insert molding. At this time, by preventing the rubber material of the insulating substrate 8 from being injected only into the exposed electric wire 5a, the electric wire 5a can be easily exposed at the middle portion in the longitudinal direction of the flat circuit body 1. This is connection hole 9
The same applies to the inner exposed wire 5b. As the electric wire 5, a copper wire or the like without an insulating coating is used.

The connector housing 4 of the present embodiment is of a female type and has a connector fitting chamber 10 having an open front end, and the tab-shaped or pin-shaped bus bars 2 and 3 are provided in the connector fitting chamber 10. Terminals 11 and 12 project upward and downward in two stages. The connector fitting chamber 10 has terminals 1 of the bus bars 2 and 3.
It is formed inside a base wall (bottom wall) 13 for inserting or press-fitting the insides 1 and 12 and a peripheral wall 14 forming a front opening. A multi-pole connector 15 is configured by the plurality of terminals 11 and 12 and the connector housing 4.

The peripheral wall 14 of the connector housing 4 is provided with a lock arm for a mating male connector housing (not shown) or an engaging hole for the mating lock arm, or a mating male connector ( (Not shown)
It is also possible to mount a slider (not shown) having a cam groove for fitting with a low insertion force. The terminals 11 and 12 are preferably fixed to the connector housing 4 by locking means so as not to come off from the base wall 13.

A mating connector housing (not shown)
Accommodates a female terminal (not shown), and the female terminal is connected to, for example, an electric wire of a wiring harness for branching. Alternatively, it is possible to directly connect an auxiliary device such as an electric component to the connector 15 on the flat circuit body 1 side.

Each of the bus bars 2 and 3 is arranged in two stages, upper and lower,
The terminals 11 and 12 of the bus bars 2 and 3 are also connected to the connector fitting chamber 10.
It protrudes up and down in two steps. The upper bus bar 2 is short, and the lower bus bar 3 is formed to be about twice as long as the upper bus bar 2. In the present embodiment, the length of the lower bus bar 3 is substantially equal to the width of the flat circuit body 1. The busbars 2 and 3 are formed of a conductive metal material in a flat plate shape.

It is of course possible to set the width of the flat circuit body 1 to be longer than the length of the lower bus bar 3. Further, the upper bus bar 2 and the lower bus bar 3 are displaced in the bus bar width direction and arranged in a staggered manner, and the terminal sides of the upper or lower bus bars 2 and 3 are bent in a substantially L-shape, and It is also possible to arrange the respective terminals 11 and 12 in a horizontal line in the connector fitting chamber 10.

A short insulating plate 7 is arranged between the upper bus bar 2 and the exposed electric wire 5a of the flat circuit body 1, and a longer insulating plate 7 is arranged between the exposed electric wire 5a and the lower bus bar 3. You. The length of the upper insulating plate 6 is substantially equal to the length of the upper bus bar 2, and the length of the lower insulating plate 7 is substantially equal to the length of the lower bus bar 3. A plurality of connection holes 16 and 17 are formed in each of the insulating plates 6 and 7 at positions corresponding to intersections of required bus bars 2 and 3 and required exposed electric wires 5a.

In the present embodiment, the upper insulating plate 6 has three
Three connection holes 16 are diagonal corresponding to the upper bus bar 2
The upper half of the insulating plate 7 is provided on the lower insulating plate 7.
(First half), that is, the length of the lower bus bar 3
4 corresponding to the range from the middle to the tip
Connection holes 17 are provided. Fourth connection hole 17 _Four
Is for joint connection.

As shown in FIG. 2, guide grooves 18 for the bus bars 2 are provided in parallel on the front side of the insulating plate 6 at an equal pitch, and as shown in FIG.
The guide grooves 19 for “a” can be provided in parallel at an equal pitch.

The guide groove 18 (FIG. 2) on the front side is
The guide groove 19 (FIG. 3) on the back side is formed to be slightly wider than the outer diameter of the exposed electric wire 5a, and the exposed wire 5a is formed to be slightly wider than the width of the exposed electric wire 5a. It can be accommodated without sticking.

Each of the front and back guide grooves 18 and 19 extends in a direction orthogonal to each other. A rectangular connection hole 16 is provided at a required location at the intersection of the guide grooves 18 and 19 on the front and back. The same applies to FIG. 1 except that the connection hole 16 is formed in each guide groove 1.
It is also possible to provide at all of the intersections of 8,19. The total number of intersections between the three bus bars 2 and the three exposed electric wires 5a is nine. The positions of the bus bar 2 and the exposed wires 5a are defined by the front and back guide grooves 18 and 19, and short-circuiting between adjacent wires and between the bus bars is prevented.

FIGS. 2 and 3 show the insulating plate 6 corresponding to the upper short bus bar 2, and the same guide groove is provided in the insulating plate 7 corresponding to the lower long bus bar 3 in FIG. It is possible to put. In this case, a guide groove for all (seven in the present embodiment) exposed wires 5 a of the flat circuit body 1 is provided on the front surface side of the insulating plate 7, and the bus bar 3 (the present working liquid) is provided on the back surface side of the insulating plate 7. Guide grooves are provided. Both guide grooves are arranged in a direction orthogonal to each other. The connection hole 17 is provided at the intersection of the exposed electric wire 5a and the lower bus bar 3 in the longitudinal direction from the tip of the upper bus bar 2 to the tip of the lower bus bar 3.

The method of assembling the flat circuit body connector structure shown in FIG. 1 (the method of assembling the flat circuit body connector) will be described in order.

First, as shown in FIGS. 4 and 5, a short insulating plate 6 is arranged on the exposed wire 5a (three in this embodiment) substantially on the left half of the flat circuit body 1. The upper short busbar 2 is arranged on the upper side. The bus bar 2 is arranged in a direction orthogonal to the exposed electric wire 5a. Bus bar 2
The connection hole 16 of the insulating plate 6 is located at the intersection of the exposed wire 5a. The terminal 11 of the bus bar 2 is press-fitted into a slit-shaped hole 20 of the base wall 13 of the connector housing 4 in advance to protrude into the connector fitting chamber 10. Alternatively, the bus bar 2 is set alone on the insulating plate 6 without being inserted into the connector housing 4. The lower longer busbar 3 (FIG. 1) has not yet been placed.

When the bus bar 2 is set, the interval between the bus bars 2 can be accurately defined by using the insulating plate 6 having the guide grooves 18 shown in FIGS.

Next, the exposed electric wire 5a and the upper bus bar 2 are spot-welded while being pressed by the upper and lower welding electrodes 21 (FIG. 4). At this time, the exposed electric wire 5a is connected to the connection hole 16 of the insulating plate 6.
Into the connection hole 16 by the pressing force of the welding electrode 21.
And is brought into close contact with the bus bar 2 in line contact within the range of the length of the connection hole 16.

As shown in FIG. 5, each bus bar 2 is connected to each exposed electric wire 5a on the left half of the flat circuit body 1 by welding.
In this embodiment the first busbar 2 ₁ the front side connected to the first exposure wire 5a ₁ of the left side, a second bus bar 2 ₂
There is connected to the second exposure wire 5a _2, a third bus bar 2
₃ is connected to the third exposure wire 5a ₃ of. For example a first bus bar 2 ₁ is connected to a second exposure wire 5a _2, a second bus bar 2 ₂ connected to the third exposure wire 5a ₃ of the third bus bar 2 ₃ first exposed wires 5a it is also possible to connect to _1, the connection form is exposed wire 5a and the bus bar 2
Is determined in advance depending on the circuit configuration with the terminal 11. The spot weld is indicated by reference numeral 22.

The insulating plate 6 prevents contact (short-circuit) between the exposed bus and other bus bars other than the required bus bar 2 and the exposed wire 5a. In the present embodiment, the first bus bar 2
₁ and the second contact of the third exposure wire 5a _2, 5a ₃ of the second bus bar 2 ₂ and the first, third exposure wire 5a _1, 5a
₃ and the contact of the third bus bar 2 ₃ and the first and second electric wire 5
The contact with a ₁ and 5a ₂ is avoided by the insulating plate 6. When nine connection holes 16 are provided in the insulating plate 6, there is a risk of this short circuit. Therefore, it is preferable to use an electric wire 5 having an insulating coating such as enamel.

Next, as shown in FIGS. 6 and 7, the lower long bus bar 3 is disposed below the short insulating plate 6, and the terminals 12 of the bus bar 3 are slit-shaped in the base wall 13 of the connector housing 4. Into the connector fitting chamber 10 by press-fitting or inserting into the hole 20 and projecting into the connector fitting chamber 10, and a longer insulating plate 7 between the bus bar 3 and the shorter insulating plate 6.
Place.

In FIGS. 4 and 5, when the connector housing 4 has not been mounted yet, the lower bus bar 3 is set as a single unit. The setting of the lower bus bar 3 is facilitated by, for example, turning the entire flat circuit body 1 upside down and placing the lower bus bar 3 on the upper side of the longer insulating plate 7.

Next, the longer bus bar 3 is spot-welded to the exposed electric wire 5a by a pair of upper and lower welding electrodes 21 in the range between the tip of the shorter bus bar 2 and the tip of the longer bus bar 3.
The exposed electric wire 5a is welded to the bus bar 3 while being pushed into the connection hole 17 of the insulating plate 7 as described above. In FIG. 7, the insulating plates 6 and 7 are drawn by virtual lines for convenience.

As shown in FIG. 7, in the present embodiment, the lower first
Bus bar 3₁Is the fourth exposed electric wire 5a _FourConnected to the second
Bus bar 3_TwoIs the sixth exposed electric wire 5a₆Connected to the
Three bus bars 3_ThreeIs the fifth exposed wire 5a_FiveAnd the seventh exposure
Electric wire 5a₇And are jointed to. Spot melting
The contact portion is indicated by reference numeral 22. Eliminate joint connections
Of course, it is possible, and the number of upper and lower
Connector 15 by increasing the number of electric wires 5 of the circuit body 1
It is also possible to increase the number of poles. Figure 7 Connector assembly
The flat circuit assembly 23 is assembled in the
Is done.

In FIGS. 4 and 5, when the connector housing 4 is not inserted, the bus bars 2 and
3 terminals 11 and 12 to the base wall 13 of the connector housing 4.
The connector housing 4 is inserted and locked or press-fitted into the slit hole 20.

As described above, by arranging the plurality of bus bars 2 and 3 having different lengths above and below the exposed wire 5a of the flat circuit body 1, it is possible to make the terminals 11 and 12 multipolar. Also, one (upper) bus bar 2 is shortened, and the other (lower)
Busbars 3 and 2, the upper and lower busbars 2 and 3
However, the exposed electric wire 5a can be easily connected (welded) to the busbars 2 and 3 in the range over the entire width of the flat circuit body 1 even if it is wrapped.

It is also possible to arrange the upper bus bar 2 and the lower bus bar 3 in a staggered manner so as not to wrap or wrap. In this case, it is necessary to bend the base of one terminal 12 in order to arrange the upper and lower terminals 11 and 12 in the connector housing 4 so as to face each other.

If it is not necessary to increase the number of poles, it is sufficient to weld and connect the exposed electric wire 5a using only the lower long bus bar 3. In that case, the terminals 12 of the bus bar 3 may be press-fitted into the base wall 13 of the connector housing 4 in advance.

When the upper and lower bus bars 2 and 3 are used,
If the terminals 12 of the lower bus bar 3 are press-fitted into the connector housing 4 in advance as shown in FIG. 1, the lower bus bar 3 becomes a hindrance so that the upper bus bar 2 and the exposed electric wire 5a cannot be welded. Then, the lower bus bar 3 is set later.

The electric wire 5 can be exposed at a desired position in the longitudinal direction of the flat circuit body 1 during resin molding of the flat circuit body 1 (at the time of insert molding of the electric wire). The multi-pole connector 15 can be easily installed at a desired position in the longitudinal direction of the circuit body 1.

The insulating substrate 8 (FIG. 1) of the flat circuit body 1 is not limited to an elastic material, but may be a flexible vinyl insulating sheet or the like (not shown). In that case, a plurality of electric wires 5 are interposed between the upper and lower vinyl insulating sheets and arranged in parallel, and the exposed electric wires 5a can be easily formed by cutting out the vinyl insulating sheet in advance.

Although the connector 15 of the above embodiment is a female connector having the connector fitting chamber 10, when a male connector (not shown) is provided, the bus bars 2, 3 are provided.
A female-female relay terminal (not shown) can be inserted into the tab-shaped or pin-shaped terminals 11 and 12 of FIG.

Further, the flat circuit bodies 1 shown in FIG. 7 are laminated on the upper and lower two sheets, and the terminals 11 and 12 of the four-layer bus bars 2 and 3 welded to the exposed electric wires 5a of each flat circuit body 1 are connected to one connector housing. It is also possible to project (accommodate) inside. In this case, a third insulating plate (not shown) is arranged between the two flat circuit bodies 1 to isolate the upper and lower exposed electric wires 5a, and furthermore, a flange portion (shown in FIG. Z)
It is also possible to position each exposed electric wire 5a by forming an electric wire guide groove in the groove. Each terminal 1 of four layers of busbars 2 and 3
1 and 12 can be arranged in two or four steps in the connector housing. The flat circuit body 1 can be stacked not only in two layers but also in three layers or more. By stacking the flat circuit bodies 1, the connector 15 can be further multipolarized.

These structures and the structures shown in FIGS. 4 to 7 are also effective as a connector structure of a flat circuit body.

[0045]

As described above, according to the first and fourth aspects of the present invention, a short busbar is welded to the upper side of a plurality of electric wires of the flat circuit body, and a long busbar is welded to the lower side. Since the bus bars are arranged in the upper and lower stages, the number of terminals of each of the upper and lower bus bars is increased, and multi-polarization of the connector in the flat circuit body is achieved. Further, the bus bar and the electric wire can be easily and reliably connected by welding, and the connector can be easily formed by housing the terminal integrated with the bus bar in the connector housing. Further, since the electric wires can be exposed at desired positions in the longitudinal direction of the flat circuit body, the connector can be easily moved to a desired position by welding the bus bar and the electric wires and receiving the bus bar terminals into the connector housing. And it can arrange | position reliably. In addition, since the conventional troublesome crimping work of the terminal and the work of inserting the electric wire with the terminal into the connector housing are unnecessary, the number of manufacturing steps and cost can be reduced. In addition, since the bus bar is arranged in the cross direction with respect to the electric wire and the connector housing is arranged at the side end of the flat circuit body, the flat circuit assembly including the connector does not increase in the thickness direction and has a flat shape. Is maintained, thereby facilitating the wiring work on the vehicle or the like, and the space on the vehicle side can be saved.

According to the second and sixth aspects of the present invention,
By each insulating plate, each bus bar and the electric wire are insulated,
Short circuits are prevented. Since the required welding between the bus bar and the electric wire is performed in the connection hole, the welding operation is easy, the connection portion (weld portion) is reliably insulated from the outside, and the reliability of the electrical connection is increased.

According to the third and seventh aspects of the present invention,
Since the bus bar and the electric wire are accurately positioned in the cross direction by the guide groove of the insulating plate, the welding position between the bus bar and the electric wire is accurately defined, and the welding position is accurately positioned in the connection hole, facilitating welding work. In addition, erroneous connection is prevented, and adjacent electric wires and bus bars are separated from each other in each guide groove, thereby preventing a short circuit, thereby increasing the reliability of electrical connection.

According to the fifth aspect of the present invention, after the electric wires are welded to the shorter bus bars, the electric wires are welded to the longer bus bars as long as they do not overlap with the shorter bus bars. Can be connected to any one of the bus bars, and various circuit configurations can be supported.

According to the eighth aspect of the present invention, by laminating the flat circuit bodies, the number of busbar layers is increased twice as many as the number of flat circuit bodies laminated, and the number of busbar terminals is increased. This further promotes the multipolarization of the connector.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a flat circuit body connector structure according to the present invention.

FIG. 2 is a perspective view showing a front side of an embodiment of an insulating plate used in a connector structure of a flat circuit body.

FIG. 3 is a perspective view showing the back side of the insulating plate.

FIG. 4 is a longitudinal sectional view showing a first step of a method of assembling a flat circuit body connector.

FIG. 5 is a perspective view showing a first step.

FIG. 6 is a longitudinal sectional view showing a second step of the method for assembling the connector of the flat circuit body.

FIG. 7 is a perspective view similarly showing a second step.

FIG. 8 is an exploded perspective view showing a connector structure of a conventional circuit body (wire harness).

FIG. 9 is a longitudinal sectional view showing the connector structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat circuit body 2 Shorter bus bar 3 Longer bus bar 4 Connector housing 5 Electric wire 5a Exposed wire 6,7 Insulating plate 11,12 Terminal 15 Connector 16,17 Connection hole 18,19 Guide groove

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (8)

[Claims] 1. A plurality of electric wires are exposed at an intermediate portion in a longitudinal direction of a flat circuit body, a shorter bus bar is arranged crossing over the electric wire, and a longer bus bar crosses below the electric wire. A connector structure for a flat circuit body, wherein the connector is arranged, each bus bar is welded to the electric wire, and the terminal of each bus bar is accommodated in a connector housing. 2. An insulating plate is disposed between the shorter bus bar and the electric wire and between the longer bus bar and the electric wire, and each insulating plate is connected to an intersection of the bus bar and the electric wire. 2. The connector structure for a flat circuit body according to claim 1, further comprising a hole, wherein each bus bar is welded to the electric wire in the connection hole. 3. The connector structure for a flat circuit body according to claim 2, wherein a guide groove for the bus bar and a guide groove for the electric wire are formed in each of the insulating plates in a crossing direction. 4. A plurality of electric wires are exposed at an intermediate portion in a longitudinal direction of the flat circuit body, a shorter bus bar on a connector side is arranged to cross over the electric wires, and the shorter bus bar is welded to the electric wires. A method for assembling a connector for a flat circuit body, comprising: arranging a longer bus bar on the connector side so as to cross the lower side of the electric wire, and welding the longer bus bar to the electric wire. 5. The connector assembly according to claim 4, wherein the electric wire is welded to the longer bus bar within a range in which the shorter bus bar and the longer bus bar have different lengths. Method. 6. An insulating plate is disposed between the shorter bus bar and the electric wire and between the longer bus bar and the electric wire, and each bus bar and the electric wire are welded in a connection hole of the insulating plate. The method for assembling a connector for a flat circuit body according to claim 4 or 5, wherein 7. The flat circuit body according to claim 6, wherein the bus bar is accommodated in a guide groove on one surface of the insulating plate, and the electric wire is accommodated in a guide groove on the other surface of the insulating plate. Connector assembling method. 8. A method of stacking a plurality of the flat circuit bodies,
The method for assembling a connector for a flat circuit body according to any one of claims 4 to 7, wherein the terminals of the bus bar are further multi-polarized.