JP5290816B2 - Welding method between flat cable and terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding method between a flat cable and a connection terminal capable of surely welding electrically without short-circuiting a conductor and a terminal, and stabilizing quality. <P>SOLUTION: A first electrode 6 of a current-carrying device 8 is pressed to a rectangular conductor 2 exposed to a conductor exposing part 3a in the conductor exposing part 3a of an insulation coating 3A which coats one side of a flat cable 1A. A second electrode 7 is pressed to a connection terminal 4 of a molded body 4A arranged in opposition to a conductor exposing part 3b of an insulation coating 3B which coats the other side. The rectangular conductor 2 pressed down by the first electrode 6 is pressed to and made in contact with the connection terminal 4 horizontally supported by the second electrode 7 in a state of being enabled to carry out current conduction. A welding site A between the rectangular conductor 2 and the connection terminal 4 is welded by the conduction of a current supplied from a power source not shown in the figure between the first electrode 6 and the second electrode 7. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention includes, for example , a flat cable (flexible flat cable, FFC: Flexible Flat Cable) formed by covering a plurality of flat conductors arranged in parallel with an insulating coating, and a plurality of connection terminals arranged in parallel. The present invention relates to a welding method between a flat cable and terminals for resistance welding.

  Conventionally, as a method of welding the flat conductor and the connection terminal of the flat cable, welding is performed by bringing a flat conductor exposed on one side of one flat cable into contact with a flat conductor exposed on one side of the other flat cable. A flat conductor welding method has been proposed (see Patent Document 1).

  In this flat conductor welding method, the flat conductor exposed by removing the insulation coating layer of one flat cable is opposed to the flat conductor exposed by partially removing the insulation coating layer of the other flat cable. Make contact. And it clamps with the horn and anvil of an ultrasonic welding machine, and ultrasonically welds the contact part of each flat conductor with the ultrasonic vibration of a horn.

  However, due to the narrow pitch of the flat cable, the welding interval between the flat conductor and the connection terminal is narrowed. Therefore, when a plurality of flat conductors arranged in parallel and the same number of connection terminals as the flat conductors are overlapped and welded in a line perpendicular to the longitudinal direction of the flat conductor, adjacent flat conductors The risk of short-circuiting each other or between the connection terminals increases.

Moreover, as shown in FIG. 6, the connection terminal 4 arrange | positioned on the molded object 4A and the flat conductor 2 of the flat cable 1A are arrange | positioned in the direction which cross | intersects with the parallel direction of the flat conductor 2, for example , an ultrasonic wave It is also conceivable to weld the welded portion A where the connecting terminal 4 and the rectangular conductor 2 intersect by pressing the welded portions 16 and 17 of the welding device 15 such as a welding device or resistance welding device from above the insulation coatings 3A and 3B. .

However, the insulating coatings 3A and 3B made of synthetic resin coated around the welded part A are melted by heat generated at the welded part A between the flat conductor 2 and the connection terminal 4, and a wider range than the welded part A. The rectangular conductor 2 may be exposed greatly (see FIG. 7). Thus, when the rectangular conductor 2 in a wider range than the welded portion A is largely exposed, there is a problem that adjacent rectangular conductors 2 are easily short-circuited and the quality is not stable.
In addition, when welding is performed by pressing the welded portion 16 from above the insulating coating 3A, the melted insulating coating remains attached to the welded portion 16, and there is a problem that continuous and stable welding cannot be performed.

JP-A-5-121139

An object of the present invention is to provide a welding method between a flat cable and a terminal, which can be reliably and electrically welded without short-circuiting the flat conductor and the connection terminal, and can stabilize the quality.

Welding method of the flat cable and the terminal according to the present invention, a plurality of flat conductor coated with an insulating coating, a pair of terminals of the welding points between the plurality of metallic connecting terminals arranged so as to intersect with the flat conductor A welding method between a flat cable and a terminal that are resistance- welded so as to be energized with a welding electrode , wherein the plurality of flat conductors are arranged in parallel with a space narrower than the width of the flat conductor, Covered from both sides of the one surface and the other surface with an insulating coating, and the insulating coating covering one surface of the flat cable is a portion where the rectangular conductor of the welded portion and the one terminal welding electrode are in contact with each other by removing the insulating coating, the insulating coating to form a conductor exposed portion having one terminal welding electrodes against the flat conductor is pressed, to cover the other surface of the flat cable, the welded箇Flat conductor and said connecting terminal by removing the insulating coating of the intersection of the, and forms a conductor exposed portion connection terminal is pressed against the flat conductor, wherein in each conductor exposed portion no insulating coating The one terminal welding electrode is pressed against the flat conductor exposed in the conductor exposed portion through the conductor exposed portion formed in the one insulating coating, and the other terminal welding electrode is pressed against the other of the insulating coating formed conductor exposed portion and oppositely disposed the connecting terminals, wherein one terminal welding electrodes pressed against the flat conductor, connecting terminal to which the other terminal welding electrode is pressed against preparative when contacted to a energizable state, while conductively resistance welding welding portion between the pair of terminal welding electrodes contacted flat conductor and the connecting terminals, one surface and the other of said insulating coating Of each of the removal area of the surface, larger than the contact profile is pressed against the flat conductor and the connection terminal of the terminal welding electrodes, adjacent rectangular conductor or, in a range not in contact with the connection terminals adjacent the one terminal welding electrodes A gap is formed between the contact outline and the end face of the insulation coating on one side of the flat cable to dissipate the heat generated at the welded part to the outside, and the conductor exposed part is formed from the end of the flat conductor. The removal range in the parallel direction of the insulation coating that forms the conductor exposed portion is larger than the width in the parallel direction of the flat conductor so that there is a parallel space between the end portions in the parallel direction of the insulation coating. The removal range of the insulating coating that forms the exposed conductor is wide , and the longitudinal interval from the longitudinal end of the welded portion to the longitudinal end surface of the insulating coating that forms the exposed conductor is the welding distance. It is set to be larger than the distance in the parallel direction from the end portion in the parallel direction to the end portion in the parallel direction of the insulating coating forming the conductor exposed portion.

The flat cable can be constituted by covering the plurality of conductors disposed in parallel with an insulating coating of a pair, those that have been integrally bonded to the insulating coating between the portion where the conductors are not clamped and the like .

Further, the rectangular conductor may be composed of a metallic conductor having conductivity. Furthermore , the insulating coating can be made of, for example , a thin synthetic resin film having flexibility and insulating properties.

Further, connection terminals, for example, Ru can be composed of metal connection terminals having conductivity such as a bus bar.

Further, the conductor exposed portion formed by removing the insulating coating, the insulating coating of the state of covering the conductive, for example, the conductor exposed portion formed by partially removing removal means such as lasers, cutters, knives, etc. Conductor exposed part formed by partially removing with a cutting means, or a flat cable formed by bonding a film-like insulation coating in which holes, windows, openings, etc. for exposing the conductor are formed in advance The conductor exposed portion in FIG.

According to the present invention, the insulation coating of the welded portion covered on one surface of the flat cable is partially removed from the area where the terminal welding means is directly pressed against the conductor of the welded portion and its periphery. Therefore, even if the pitch interval between the flat conductor and the connection terminal is narrow, adjacent conductors or terminals are not short-circuited, and the flat conductor and the connection terminal can be electrically and reliably welded. Also, since the insulation coating at the welding location is removed in such a size that contact with the terminal welding electrode is avoided , and in the parallel direction of the insulation coating forming the conductor exposed portion, it is removed wider than the width in the parallel direction of the rectangular conductors . At the time of resistance welding, heat generated at the welded portion between the flat conductor and the connection terminal is dissipated from the exposed portion of the exposed flat conductor around the welded portion. Thereby, the short circuit which arises when the insulation coating which coat | covers the circumference | surroundings of a welding location melt | dissolves carelessly can be prevented.

The longitudinal side view which shows the welding method of a flat cable and a connection terminal. The longitudinal section side view which shows the welding state of a flat conductor and a connection terminal. The top view which shows the flat cable in which the conductor exposed part was formed. The top view which shows the intersection state of a flat conductor and a connection terminal. Detailed explanatory drawing about a conductor exposure part. The longitudinal side view which shows the welding method of a prior art example. FIG. 7 is a longitudinal side view showing a welded state of the flat conductor and the connection terminal of FIG. 6.

One embodiment of the present invention is a flat cable used when three rectangular conductors arranged in parallel and three connection terminals arranged orthogonal to each of the rectangular conductors are resistance- welded so as to be energized. And a welding method of the connecting terminal.

  As shown in FIGS. 1 and 2, the welding method of the flat cable 1A and the connection terminal 4 is performed by three conductive metallic coatings covered with two insulating coatings 3A and 3B of the flat cable 1A. A welding method in which the flat conductor 2 and three conductive metal connection terminals 4 arranged orthogonally to the flat conductor 2 on the molded body 4A are welded so as to be energized by a terminal welding device 5 described later. It is.

  That is, a range in which a contact 6a of a first electrode 6 described later is directly pressed against a flat conductor 2 at a welding location A on an insulating coating 3A that covers one surface of the flat cable 1A (the upper surface side shown in FIG. The periphery is partially removed. Thereby, the conductor exposed part 3a in which the contact 6a of the first electrode 6 is directly pressed against the flat conductor 2 is formed at the welding portion A where the flat conductor 2 and the connection terminal 4 intersect in the insulating coating 3A.

  Similarly to the above, the conductor exposed portion 3a in which the contact 6a of the first electrode 6 is directly pressed against the flat conductor 2 is also applied to the welded portion A where the other flat conductor 2 and the connection terminal 4 intersect in the insulating coating 3A. Form each one.

  A range in which the contact 7a of the second electrode 7 is pressed against the rectangular conductor 2 at the welding point A via the connection terminal 4 and the surrounding area of the insulating coating 3B coated on the other surface (the lower surface side shown in FIG. 1) Is partially removed. As a result, a conductor exposed portion 3b in which the connection terminal 4 is directly pressed against the flat conductor 2 by the contact 7a of the second electrode 7 is formed at the welding point A where the flat conductor 2 and the connection terminal 4 intersect in the insulating coating 3B. To do.

  In the same manner as described above, the connection terminal 4 is directly pressed against the flat conductor 2 by the contact 7a of the second electrode 7 at the welding point A where the other flat conductors 2 and 2 and the connection terminal 4 in the insulating coating 3B intersect. Conductor exposed portions 3b to be formed are respectively formed.

After the flat conductor 2 of the flat cable 1A and the connection terminal 4 of the molded body 4A are overlapped with each other orthogonally (see FIG. 4), between the first electrode 6 and the second electrode 7 of the terminal welding device 5 insert. The contact 6a of the first electrode 6 is pressed vertically from above to the flat conductor 2 exposed at the conductor exposed portion 3a through the conductor exposed portion 3a of the insulating coating 3A.
The contact 7a of the second electrode 7 is pressed vertically from below to the connection terminal 4 disposed opposite to the conductor exposed portion 3b of the insulating coating 3B and the flat conductor 2.

  The rectangular conductor 2 pushed down by the contact 6a of the first electrode 6 can be pressed against the connection terminal 4 supported horizontally by the contact 7a of the second electrode 7 so that the welding point A between the flat conductor 2 and the connection terminal 4 can be energized. Contact with different conditions.

  After that, between the first electrode 6 and the second electrode 7 connected by the flat conductor 2 and the connection terminal 4, a current supplied from a power source (not shown) provided in the energization device 8 to be described later is passed, Resistance welding is performed so that the welding location A where the flat conductor 2 and the connection terminal 4 are in contact with each other can be energized (see FIG. 2).

  In addition, the removal range in the parallel direction W of the insulation coatings 3A and 3B forming the conductor exposed portions 3a and 3b is set to the first parallel direction interval Dw1 from the welding location A, and from the conductor end 2b of the flat conductor 2 Two parallel direction intervals Dw2 are set.

  The above-described method and configuration will be described in detail. A flat cable 1A is composed of three flat conductors 2 formed to have the same width and insulating coatings 3A and 3B covering the upper and lower surfaces of the flat conductors 2 arranged in parallel. (See FIG. 3).

The three flat conductors 2 are arranged in parallel in parallel with a predetermined pitch interval.
The two insulating coatings 3A and 3B covering the upper and lower surfaces of the conductor group in which the flat conductors 2 are arranged in parallel are made of a synthetic resin film having flexibility and insulating properties, and the flat conductor 2 is sandwiched between them. The portions of the insulation coating 3A, 3B that are not formed are integrally bonded to each other.

Connection terminal 4 is provided with flat conductor 2 and the same number of flat cable 1A, on synthetic resin molded body 4A having an insulating property, in parallel arranged in parallel at an interval corresponding to the terminal pitch of the connector (not shown) (See FIG. 4).
Note that the arrangement pitch of the flat conductors 2 and the connection terminals 4 does not need to be matched, and is appropriately set according to various conditions of the location to be used.

  When welding the flat conductor 2 of the flat cable 1A and the connection terminal 4 of the molded body 4A, the flat angle built in the flat cable 1A is placed on the three connection terminals 4 arranged on the molded body 4A. The flat cable 1A and the molded body 4A are overlapped with each other with the conductor 2 being orthogonal.

  In the embodiment, the example in which the three flat conductors 2 arranged in parallel in the flat cable 1A and the three connection terminals 4 arranged in parallel in the molded body 4A are welded orthogonally is shown. In addition, depending on the conditions of the location to be used, it may be arranged so as to cross obliquely at a desired angle.

  The insulation coating 3A that covers one surface of the flat cable 1A is directly connected to the flat conductor 2 with the contact 6a of the first electrode 6 at a plurality of welding locations A where the flat conductor 2 and the connection terminal 4 intersect. The conductor exposed portions 3a to be pressed are formed.

Conductor exposed portion 3a is partly in the weld portion A of the flat range contact 6a with respect to the rectangular conductor 2 first electrode 6 is pressed and removal means, not shown insulation coating 3A of the surrounding (e.g. lasers, etc.) Removed and formed.

  The insulation coating 3B covering the other surface has a plurality of welding points A where the flat conductor 2 and the connection terminal 4 intersect, and the connection terminals 4 supported by the contacts 7a of the second electrode 7 on the flat conductor 2. Conductor exposed portions 3b that are directly pressed against each other are formed.

The conductor exposed portion 3b is a removal means (for example, a layer not shown) that covers the area where the connection terminal 4 supported by the contact 7a of the second electrode 7 is pressed against the flat conductor 2 of the welding location A and the surrounding insulation coating 3B. Etc. ) and partially removed.

  The range in which the insulation coatings 3A and 3B are removed from the welded portion A, that is, the size of the conductor exposed portions 3a and 3b is wider than the contact 6a of the first electrode 6 and the contact 7a of the second electrode 7, and adjacent rectangular conductors 2, Or it is set as the magnitude | size which does not contact the adjacent connection terminal 4 and does not contact an adjacent removal location.

  More specifically, for example, in the case of a flat cable 1A using a very thin flat conductor 2 of about 0.035 mm, the end surface 3Aa in the longitudinal direction L of the insulating coatings 3A and 3B from the longitudinal end Aa of the welded portion A. ', 3Ba' is formed with a longitudinal interval DL of 0.35 mm or more. In addition, it is more preferable if the longitudinal distance DL can be secured by 0.5 mm or more.

Further, the parallel direction end portion Ab insulating coating 3A, the end surface 3Ab parallel direction W of 3B ', 3Bb' the first parallel direction spacing Dw1 up, 0.1 mm or more, and flat conductor 2 of the conductor end of the welding point A part 2b end face from 3Ab ', 3Bb' the second parallel direction spacing Dw2 up, are formed at least 0.05 mm. That is, the width of the conductor exposed portions 3a and 3b in the parallel direction W is formed wider than the width of the flat conductor 2 in the parallel direction W.

The above size is one example, this is not intended to be limited constant, as described above, not in contact with the adjacent removal position, the size of a short circuit by flat conductor 2 and the connection terminals 4 adjacent does not occur be able to. The longitudinal distance DL, the first parallel direction distance Dw1 and the second parallel direction distance Dw2 are the size, material, welding temperature and time of the flat conductor 2 and the connection terminal 4, and the insulation coating 3A, What is necessary is just to set according to melting | fusing point of 3B.

  Since the area where the insulation coating 3A is removed from the welded portion A, that is, the conductor exposed portion 3a is formed with the above size, when the contact 6a of the first electrode 6 is pressed against the flat conductor 2 exposed to the conductor exposed portion 3a Between the end surface 3A ′ of the insulating coating 3A and the side surface 6a ′ of the contact 6a pressed against the flat conductor 2 via the conductor exposed portion 3A, a welding point A between the flat conductor 2 and the connection terminal 4 is provided. A gap S for dissipating the generated heat is formed.

Thereby, at the time of welding, heat generated at the welding location A between the flat conductor 2 and the connection terminal 4 from the gap S formed between the end surface 3A ′ of the insulating coating 3A and the side surface 6a ′ of the contact 6a. Dissipated. The end surface 3A ′ of the insulating coating 3A is formed along the peripheral edge of the conductor exposed portion 3a, and the end surface 3B ′ of the insulating coating 3B is formed along the peripheral edge of the conductor exposed portion 3b.
Further, since the width of the conductor exposed portions 3a and 3b in the parallel direction W is formed wider than the width of the flat conductor 2 in the parallel direction W, heat generated at the welded portion A between the flat conductor 2 and the connection terminal 4 is formed. Is difficult to be transmitted to the end faces 3A 'and 3B' of the insulating coatings 3A and B.

  In addition, since the adjacent weld locations A are not adjacent to the flat conductor 2 in the parallel direction or are not adjacent to the flat conductor 2 in the orthogonal direction, the weld locations A are arranged adjacent to each other. Rather than doing this, the interval between the welded points A becomes wider.

  If the welding locations A are separated from each other, it is difficult for heat generated during welding to be transmitted to the adjacent welding location A. Thereby, it is difficult to melt | dissolve insulation coating 3A, 3B coat | covered between the welding locations A, and it can prevent that the short circuit resulting from melt | dissolving carelessly arises.

As the lasers other than removal means, for example a cutter, or removed by ablation means such as a knife, or holes for exposing the flat conductors 2, window insulation-shaped openings or the like is formed film The coverings 3A and 3B may be bonded together.

  The terminal welding device 5 for welding the flat conductor 2 and the connection terminal 4 of such a flat cable 1A has a first electrode 6 pressed against the flat conductor 2 exposed at the conductor exposed portion 3a, and the connection terminal 4. The second electrode 7 to be pressed, an energization device 8, and an energization detection circuit 9 (see FIG. 1).

  The first electrode 6 is configured to be pressed against the flat conductor 2 exposed at the conductor exposed portion 3a through the conductor exposed portion 3a formed on the insulating coating 3A of the flat cable 1A. In this configuration, the conductor exposed portion 3b formed on 3B and the connecting terminal 4 arranged to face the flat conductor 2 are pressed.

  The energization device 8 is configured to energize a current necessary for resistance welding the welded portion A of the flat conductor 2 and the connection terminal 4 between the first electrode 6 and the second electrode 7. Is a configuration for detecting that the flat conductor 2 and the connection terminal 4 are in contact with each other in an energizable state.

  The first electrode 6 and the second electrode 7 include a sandwiching position where the welding portion A between the flat conductor 2 of the flat cable 1A and the connection terminal 4 of the molded body 4A is sandwiched by lifting means (not shown), the flat cable 1A and the molded body. 4A is moved relative to the vertical direction to a separation position where insertion and extraction of a portion formed by superimposing 4A are allowed.

  The first electrode 6 is arranged above the flat conductor 1A of the flat cable 1A, which is overlapped perpendicularly to the connection terminal 4 of the molded body 4A, and is arranged above the flat conductor 2 with a pitch interval corresponding to the flat conductor 2. Arranged. Further, the lower end side of the first electrode 6 is exposed to the conductor exposed portion 3a so as to face the conductor exposed portion 3a of the insulating coating 3A formed at the welding portion A where the flat conductor 2 and the connection terminal 4 intersect. A contact 6a that is pressed against the flat rectangular conductor 2 is provided.

  The second electrode 7 is disposed below and facing the connection terminal 4 of the molded body 4A, which is overlapped perpendicularly to the flat conductor 2 of the flat cable 1A, and is separated by a pitch interval corresponding to the connection terminal 4. Arranged. Further, on the upper end side of the second electrode 7, a connection is arranged so as to face the conductor exposed portion 3 b of the insulation coating 3 B formed at the welding location A where the flat conductor 2 and the connection terminal 4 intersect and the flat conductor 2. A contact 7 a that is pressed against the terminal 4 is provided.

  The contact 6a of the first electrode 6 and the contact 7a of the second electrode 7 are formed to be narrower than the horizontal width of the flat conductor 2 and the connection terminal 4, and are substantially the same as the welding location A where the flat conductor 2 and the connection terminal 4 intersect. It is formed in the size and shape. Or it forms in the magnitude | size and shape pressed inside the outline of the welding location A. FIG.

  The energization device 8 is connected to the first electrode 6 and the second electrode 7 via two electric wires 8a and 8a, and when a trigger signal is output from an energization detection circuit 9 described later, the first electrode 6 The first electrode 6 and the second electrode 7 are formed by opening a current-carrying circuit to the second electrode 7 and pressing the current necessary for resistance welding supplied from a power source (not shown) against the rectangular conductor 2 and the connection terminal 4. Energized for a predetermined time.

  As a result, the contact portion between the flat conductor 2 and the connection terminal 4 is heated to a temperature at which it melts. The energization circuit between the first electrode 6 and the second electrode 7 is closed until the trigger signal is output from the energization detection circuit 9.

  As described above, in the case of the present embodiment using the very thin flat conductor 2 of 0.035 mm, in order to resistance weld the flat conductor 2 and the connection terminal 4, several hundreds of degrees Celsius of several tens of msec. Temperature is required and power is applied to reach 800 ° C. in approximately 8 msec.

Energization detection circuit 9 via the two electric wires 9 a, is connected to the first electrode 6 and the second electrode 7, the weak current supplied from a power source (not shown) and the first electrode 6 and the second electrode 7 Are constantly energized, and electrical changes such as resistance, current, voltage, and the like that occur when the flat conductor 2 and the connection terminal 4 are brought into contact with each other in an energizable state are detected.

  That is, the rectangular conductor 2 pushed down by the contact 6a of the first electrode 6 in the conductor exposed portion 3a of the insulating coating 3A is connected to the connection terminal supported by the contact 7a of the second electrode 7 in the conductor exposed portion 3b of the insulating coating 3B. 4, the welded portion A between the flat conductor 2 and the connection terminal 4 is brought into contact with the energized state.

  At this time, by detecting an electrical change that occurs when the first electrode 6 and the second electrode 7 are energized by the energization detection circuit 9, the rectangular conductor 2 and the connection terminal 4 are in contact with each other in an energizable state. Can be detected. The energization detection circuit 9 outputs a trigger signal to the energization device 8 when it is detected that the flat conductor 2 and the connection terminal 4 are in contact with each other in an energizable state.

  On the other hand, the energization device 8 energizes a current necessary for resistance welding between the first electrode 6 and the second electrode 7 when a trigger signal is output from the energization detection circuit 9, The contact portion between the flat conductor 2 and the connection terminal 4 sandwiched between the 6 and the second electrode 7 is welded.

  If it is not detected by the energization detection circuit 9 that the rectangular conductor 2 and the connection terminal 4 are in contact with each other, the energization detection circuit 9 allows the flat conductor 2 and the connection terminal 4 to be energized. Until the contact is detected, the first electrode 6 and the second electrode 7 are moved relative to each other.

  The illustrated embodiment is configured as described above, and a welding method between the flat conductor 2 incorporated in the flat cable 1A and the connection terminal 4 arranged on the molded body 4A will be described in detail below.

  First, the flat conductor 2 built in the flat cable 1A and the connection terminals 4 arranged on the molded body 4A are overlapped with each other orthogonally (see FIG. 4), and then the flat cable 1A and the molded body 4A are stacked. It inserts between the 1st electrode 6 and the 2nd electrode 7 of the terminal welding apparatus 5 with match | combining (refer FIG. 1).

  The contact 6a of the first electrode 6 is opposed to the flat conductor 2 at the welding location A exposed at the conductor exposed portion 3a in the conductor exposed portion 3a of the insulating coating 3A that covers one surface of the flat cable 1A.

  Pressing the contact 7a of the second electrode 7 vertically from below to the connection terminal 4 of the molded body 4A disposed opposite to the conductor exposed portion 3b of the insulating coating 3B and the flat conductor 2 covering the other surface, The welding location A of the connection terminal 4 to which the flat conductor 2 is pressed is horizontally supported.

  The first electrode 6 and the second electrode 7 are moved relative to each other in the direction in which the welded portion A between the flat conductor 2 and the connection terminal 4 is sandwiched, and the contact 6a of the first electrode 6 is exposed to the conductor exposed portion 3a of the insulating coating 3A. In FIG. 2, the flat conductor 2 exposed at the conductor exposed portion 3a is pressed vertically from above.

  The rectangular conductor 2 pushed down by the contact 6a of the first electrode 6 is pressed against the connection terminal 4 supported horizontally by the contact 7a of the second electrode 7 in the conductor exposed portion 3b of the insulating coating 3B, and the rectangular conductor 2 and the connection terminal are pressed. 4 is brought into contact with a state where electricity can be passed.

  When the flat conductor 2 and the connection terminal 4 are brought into contact with each other in an energizable state, the energization detection circuit 9 detects an electrical change that occurs between the first electrode 6 and the second electrode 7 and is connected to the flat conductor 2. It is recognized that the terminal 4 is brought into contact with the energized state. The energization detection circuit 9 outputs a trigger signal to the energization device 8 when it is detected that the flat conductor 2 and the connection terminal 4 are in contact with each other in an energizable state.

  The energization device 8 that has received the trigger signal from the energization detection circuit 9 energizes a current supplied from a power source (not shown) between the first electrode 6 and the second electrode 7, and connects the rectangular conductor 2 and the connection terminal 4. The contact portion is welded (see FIG. 2). Thereby, the flat conductor 2 incorporated in the flat cable 1A and the connection terminal 4 disposed on the molded body 4A can be reliably and well welded.

  When the welding of the flat conductor 2 and the connection terminal 4 is completed, the welding operation by the terminal welding device 5 is stopped, the first electrode 6 and the second electrode 7 are moved relative to each other in the separating direction, and the flat cable 1A and the molding are formed. If the body 4A is extracted from between the first electrode 6 and the second electrode 7, the welding operation is completed.

  Thereby, even if the pitch interval between the flat conductor 2 and the connection terminal 4 is narrow, the adjacent flat conductors 2 or the connection terminals 4 are not short-circuited, and the flat conductor 2 and the connection terminal 4 are electrically connected. It can be surely welded.

  As described above, in the insulating coating 3A that covers one surface of the flat cable 1A, the range in which the contact 6a of the first electrode 6 is directly pressed against the flat conductor 2 at the welding point A and the periphery thereof are partially removed. Therefore, even if the pitch interval between the flat conductor 2 and the connection terminal 4 is narrow, the adjacent flat conductors 2 or the connection terminals 4 are not short-circuited, and the flat conductor 2 and the connection terminal 4 are electrically connected. Can be welded.

  Further, since the insulation coating 3A at the welding location A is removed in such a size and shape that the contact with the contact 6a of the first electrode 6 is avoided, the welding between the flat conductor 2 and the connection terminal 4 is performed during welding. The heat generated at the location A is dissipated from the exposed portion of the flat conductor 2 exposed at the welding location A. Thereby, insulation coating 3A, 3B coat | covered around the welding location A is not melt | dissolved, and it can prevent that a short circuit arises.

Specifically, in order to resistance weld the very thin rectangular conductor 2 of 0.035 mm and the connection terminal 4, energization is performed to reach 800 ° C. in 8 msec, but the longitudinal interval DL is 0.35 mm or more apart. , the first parallel direction spacing Dw1 0.1 mm or more, and for a second parallel direction spacing Dw2 you are formed at least 0.05 mm, sufficient to dissipate the heat generated in the weld portion a by the energization The gap S can be secured.
Therefore, it is possible to prevent the insulating coatings 3A and 3B covering the periphery from being inadvertently dissolved and causing a short circuit.

Further, not only the first parallel direction interval Dw1 from the parallel direction end Ab to the end faces 3Ab ′, 3Bb ′ in the parallel direction W, but also from the conductor end 2b of the flat conductor 2 through which the welding temperature is conducted to the end surfaces 3Ab ′, 3Bb ′. Since the conductor exposed portions 3a and 3b are formed with a predetermined interval also being secured in the second parallel direction interval Dw2, until the distance between the adjacent conductor exposed portions 3a and 3b is shortened, Insulation coatings 3A and 3B between adjacent conductor exposed portions 3a and 3b can be prevented from inadvertently dissolving and causing a short circuit.
Further, since the width of the conductor exposed portions 3a and 3b in the parallel direction W is formed wider than the width of the flat conductor 2 in the parallel direction W, heat generated at the welded portion A between the flat conductor 2 and the connection terminal 4 is formed. Can be prevented from being transmitted to the end faces 3A 'and 3B' of the conductor exposed portions 3a and 3b, and the insulating coatings 3A and 3B can be prevented from being inadvertently dissolved and causing a short circuit.

In addition, the longitudinal spacing DL, the first parallel direction spacing Dw1 and second parallel direction spacing Dw2, the size of such the thickness of the rectangular conductor 2 and the connection terminal 4, material, welding temperature and time, and further insulating coating 3A , 3B, the convenience can be improved.

  Furthermore, since the insulation coating 3A of the welding location A is removed in a size and shape that avoids contact with the contact 6a of the first electrode 6, insulation dissolved in the contact 6a of the first electrode 6 by welding. It is possible to prevent the coating 3A from adhering. Accordingly, continuous and stable welding can be performed.

In the correspondence between the configuration of the present invention and the above embodiment,
The conductor of the present invention corresponds to the flat conductor 2 of the embodiment,
Similarly,
The terminal corresponds to the connection terminal 4,
The terminal welding means corresponds to the first electrode 6 and the second electrode 7,
The first predetermined interval corresponds to the first parallel direction interval Dw1,
The end in the parallel direction corresponds to the conductor end 2b,
The second predetermined interval corresponds to the second parallel direction interval Dw2,
The present invention is not limited only to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.

  The flat cable 1 may be the flat cable 1 in which the flat conductor 2 is covered with the nonconductive resin film that is the insulation coating 3A, 3B, and is not particularly limited to the one of the present embodiment, but is not conductive. Specifically, a PET resin is preferable as the material for the conductive resin film.

The flat conductor 2 may be made of any material as long as it has electrical conductivity, but is preferably made of metal, more preferably copper or copper alloy having excellent electrical conductivity.

  The connection terminal 4 is obtained by bending a metal plate. The material may be any material as long as it has conductivity, but is preferably made of metal, more preferably copper or copper alloy having excellent conductivity. The plate thickness is about 0.1 mm to 5 mm.

A ... welding location 1A ... flat cable 2 ... flat conductor 2b ... conductor end 3A, 3B ... insulation coating 3a, 3b ... conductor exposed part 4 ... connection terminal 6 ... first electrode (terminal welding electrode)
7. Second electrode (terminal welding electrode)
Dw1 ... parallel column interval
S ... Gap

Claims (1)

A plurality of flat conductor coated with an insulating coating, the flat cable and the terminals which conductively resistance welding welding portions between the plurality of metallic connecting terminals arranged so as to intersect with the flat conductor in the pair of terminal welding electrodes Welding method with
The plurality of flat conductors are arranged in parallel in parallel with an interval narrower than the width of the flat conductor,
The flat cable is covered with both sides of one side and the other side with the insulating coating,
Wherein the insulating coating covering the one surface of the flat cable, by removing the insulating coating of the flat conductor and the first terminal welding electrodes are in contact with portions of said welded portion, one terminal welding electrodes against the flat conductor Forming a conductor exposed part against which
The insulating coating that covers the other surface of the flat cable, wherein by removing the insulating coating of the portion where the rectangular conductor welding point and the connection terminal intersect, the conductor exposed connection terminal to said flat conductor is pressed Forming part,
Each conductor exposed portion is formed so that there is no insulation coating,
The one terminal welding electrode is pressed against the flat conductor exposed in the conductor exposed portion through the conductor exposed portion formed in the one insulating coating,
The other terminal welding electrode is pressed against the connection terminal disposed opposite to the conductor exposed portion formed on the other insulating coating,
And the one terminal welding electrodes pressed against the flat conductor, when the other terminal welding electrodes in contact with the ready current and connection terminals pressed, flat which is contacted with the pair of terminal welding electrodes In addition to conducting resistance welding so that the welding point between the conductor and the connection terminal can be energized,
The removal range of each of the one surface and the other surface of the insulation coating is wider than the contact outer shape pressed against the flat conductor and the connection terminal of the terminal welding electrode , and does not contact the adjacent flat conductor or the adjacent connection terminal. A gap is formed between the contact outer shape of one terminal welding electrode and the end surface of the insulation coating on one surface side of the flat cable to dissipate heat generated in the welding location to the outside.
Between the end of the flat conductor and the end in the parallel direction of the insulation coating that forms the conductor exposed portion, so as to have a parallel spacing,
The removal range in the parallel direction of the insulating coating that forms the conductor exposed portion is formed wider than the width in the parallel direction of the flat conductor ,
The removal range of the insulating coating forming the conductor exposed portion is:
The longitudinal distance from the longitudinal end of the welded portion to the longitudinal end surface of the insulating coating forming the conductor exposed portion is the end in the parallel direction of the insulating coating forming the exposed conductor from the parallel end of the welded portion. welding how the larger set <br/> flat cable and the terminal than the parallel direction interval between parts.

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