WO2014024524A1 - フレキシブルプリント基板及びその製造方法 - Google Patents

フレキシブルプリント基板及びその製造方法 Download PDF

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Publication number
WO2014024524A1
WO2014024524A1 PCT/JP2013/061875 JP2013061875W WO2014024524A1 WO 2014024524 A1 WO2014024524 A1 WO 2014024524A1 JP 2013061875 W JP2013061875 W JP 2013061875W WO 2014024524 A1 WO2014024524 A1 WO 2014024524A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
eyelet
flexible printed
connection terminal
circuit board
Prior art date
Application number
PCT/JP2013/061875
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
昭広 中村
Original Assignee
日本メクトロン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本メクトロン株式会社 filed Critical 日本メクトロン株式会社
Priority to DE112013000132.2T priority Critical patent/DE112013000132T5/de
Priority to CN201380002840.5A priority patent/CN103766012B/zh
Publication of WO2014024524A1 publication Critical patent/WO2014024524A1/ja

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/25—Monitoring devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/36—Auxiliary equipment
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/328—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/42—Printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of a flexible or folded printed circuit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10227—Other objects, e.g. metallic pieces
    • H05K2201/10272—Busbars, i.e. thick metal bars mounted on the PCB as high-current conductors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10227—Other objects, e.g. metallic pieces
    • H05K2201/10401—Eyelets, i.e. rings inserted into a hole through a circuit board
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/4007—Surface contacts, e.g. bumps
    • H05K3/4015—Surface contacts, e.g. bumps using auxiliary conductive elements, e.g. pieces of metal foil, metallic spheres

Definitions

  • the present invention relates to a flexible printed circuit board (FPC) and a method for manufacturing the same, and more particularly to a flexible printed circuit board and a method for manufacturing the flexible printed circuit board in which the bonding strength between a connection terminal (metal foil) of the flexible printed circuit board and a bus bar is improved. .
  • FPC flexible printed circuit board
  • resistance welding is widely used when joining a connection terminal of a flexible printed circuit board and a bus bar.
  • This energization method by resistance welding is roughly divided into a direct energization method and a parallel energization method.
  • a three-layer structure comprising a base 2 made of polyimide, a copper foil part (connection terminal) 3 and a cover 4 made of polyimide is formed on one end of the upper surface of a thick metal bus bar (conductive plate) 1.
  • the terminal portion of the flexible printed circuit board 5 is placed. Further, the copper foil portion 3 of the flexible printed circuit board 5 has the lower surface of the portion corresponding to the bus bar 1 exposed, and the exposed surface of the copper foil portion 3 is in surface contact with the upper surface of the bus bar 1.
  • an electrode 6 for welding is disposed on the lower surface side of the bus bar 1
  • an electrode 7 for welding is disposed on the upper surface side of the bus bar 1 so as to face the electrode 6.
  • the pair of upper and lower electrodes 6 and 7 are configured to be movable in the vertical direction independently of each other by a moving mechanism (not shown).
  • an opening 8 for inserting an electrode is formed at a position corresponding to the electrode 6 in the base 2, and the tip of the upper electrode 7 is formed on the upper surface of the copper foil portion 3 facing the opening 8. The parts are in contact.
  • a welding current flows between the electrodes 6 and 7.
  • the welding current moves along the shortest current path 9 in the thickness direction of the copper foil portion 3 and the bus bar 1.
  • the flexible printed circuit board 5 is disposed on the lower surface side of the bus bar 1, and the upper surface of the copper foil portion 3 of the flexible printed circuit board 5 is brought into surface contact with the lower surface of the bus bar 1.
  • a pair of electrodes 10 and 11 are arranged side by side on the upper surface side of the bus bar 1 so as to be spaced apart from each other.
  • the welding current moves along the current path 13 shown in the figure, but is divided into a current moving in the copper foil portion 3 and a current moving in the bus bar 1 on the way.
  • the direct energization method conducts resistance welding between the connection terminal (copper foil portion) and the bus bar by energizing between a pair of upper and lower electrodes facing each other through the flexible printed board.
  • the pair of electrodes are disposed on both the upper and lower sides of the flexible printed circuit board, it is difficult to employ the flexible printed circuit board when the flexible printed circuit board is mounted above a bus bar that is a vehicle battery module, for example.
  • the parallel energization method performs resistance welding between the connection terminal and the bus bar by energizing between a pair of electrodes arranged in parallel on one side of the flexible printed circuit board. Since it flows directly into the bus bar, it is easy to cause a short circuit. Therefore, if the thickness of the bus bar is not reduced to about 0.2 mm or less, for example, it is difficult to ensure a sufficient bonding strength with the connection terminal.
  • Both the direct energization method and the parallel energization method are for avoiding inadvertent fusing when joining a flexible printed circuit board with a thin metal layer (connection terminal) such as copper foil and a thick metal bus bar. Precise resistance welding with less heat load is adopted in a short time.
  • the joint by precision resistance welding is a weld interface between the thin connection terminal and the thick bus bar, the difference in thickness between the two is large. Therefore, the strength of the joint is caused by the metal layer having the lowest joint strength depending on the thickness, and therefore, the fracture of the joint occurs almost on the metal layer side.
  • the bonding strength of the metal layer (connecting terminal) of the flexible printed circuit board is lowered below a required value due to vehicle vibration and thermal expansion and contraction (dimension difference). As a result, there has been a problem that the function and quality of the flexible printed circuit board are lowered.
  • the present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a flexible printed circuit board having a circuit part provided with a connection terminal joined to a bus bar.
  • a flexible printed circuit board is provided in which the eyelet is fastened to the eyelet and the eyelet and the bus bar, the eyelet and the connection terminal, and the connection terminal and the bus bar are joined by welding.
  • eyelets made of a metal material such as brass are attached to the connection terminals of the circuit section. Then, between the eyelet and the bus bar, between the eyelet and the connection terminal, and between the connection terminal and the bus bar are joined by welding. As a result, unlike the conventional structure, the eyelet and the bus bar are also bonded with high strength, so that the bonding strength between the flexible printed circuit board and the bus bar as a whole increases as compared with the conventional technology.
  • a step of fastening eyelets to the connection terminal of the circuit portion in the method of manufacturing a flexible printed circuit board having a circuit portion provided with a connection terminal joined to a bus bar, a step of fastening eyelets to the connection terminal of the circuit portion; and the flexible printed circuit board Placed on the bus bar, contacting the eyelet and the connection terminal to one side of the bus bar, pressing one of the pair of electrodes against the eyelet, and pressing the other electrode against one side of the bus bar, And the step of pressing the connection terminal of the circuit part against the bus bar by a push rod disposed between a pair of electrodes, energization between the pair of electrodes, between the eyelet and the bus bar, between the eyelet and the connection terminal, And a step of joining the connection terminal and the bus bar by welding, respectively.
  • the flexible printed circuit board to which the eyelet is fixed in advance is placed on the bus bar, and the connection terminal and the eyelet are brought into contact with one side of the bus bar. Then, one of the pair of electrodes is pressed against the eyelet, the other electrode is pressed against one side of the bus bar, and the connection terminal is pressed against the bus bar with a push rod disposed between the pair of electrodes, Energize.
  • a step of fastening eyelets to the connection terminal of the circuit portion in the method for manufacturing a flexible printed circuit board having a circuit portion provided with a connection terminal joined to a bus bar, a step of fastening eyelets to the connection terminal of the circuit portion; and the flexible printed circuit board Placing the eyelet and the connection terminal on one side of the bus bar and placing one of a pair of electrodes on the eyelet with an insulator interposed between the eyelet and the bus bar; And pressing the other electrode against one side of the bus bar and pressing the connection terminal of the circuit portion against the bus bar with a push rod disposed between the pair of electrodes, and energizing between the pair of electrodes.
  • the step of joining the eyelet and the connection terminal and the connection terminal and the bus bar by welding, and removing the insulator after welding. To provide a manufacturing method of a flexible printed circuit board, characterized in that it comprises the steps of joining by welding between the said eyelet busbar.
  • the flexible printed circuit board to which the eyelet is fixed in advance is placed on the bus bar, and the connection terminal and the eyelet are brought into contact with one side of the bus bar. Then, with an insulator interposed between the eyelet and the bus bar, one of the pair of electrodes is pressed against the eyelet, the other electrode is pressed against one side of the bus bar, and a push rod disposed between the pair of electrodes.
  • the invention according to claim 1 can significantly improve the bonding strength between the flexible printed circuit board and the bus bar without forming the bus bar thinly. For example, even when the flexible printed circuit board is bonded to the bus bar as an in-vehicle battery module, There is no fear of reducing the bonding strength due to vibration or thermal expansion and contraction, and the function and quality of the flexible printed circuit board can be stably maintained for a long time.
  • the flexible printed circuit board of the present invention welded to one side of the bus bar can be welded together between the connection terminal and the eyelet and between the connection terminal and the bus bar, and easily and high strength by resistance welding above the vehicle battery. Can be attached to.
  • the required welding strength between the eyelet and the bus bar can be ensured and the joint by the low resistance welding between the eyelet and the connecting terminal and between the connecting terminal and the bus bar can be realized at the same time. Even without it, the flexible printed circuit board and the bus bar can greatly improve the bonding strength, and there is no risk of lowering the bonding strength due to vibration or thermal expansion and contraction. Can be easily mass-produced.
  • the insulator is interposed between the eyelet and the bus bar, the ratio of the welding current diverted from the eyelet to the connection terminal side is increased, and between the eyelet and the connection terminal, and between the connection terminal and the bus bar. In addition, it is possible to more efficiently realize the joining by the low resistance welding in and to further improve the joining strength between the connection terminal and the bus bar.
  • FIG. 5 is an explanatory plan view of FIG. 4.
  • Front explanatory drawing which shows the flexible printed circuit board concerning the prior art example of a parallel electricity supply system.
  • the present invention provides a connection terminal bonded to the bus bar.
  • the eyelet is fixed to the connection terminal of the circuit portion, and between the eyelet and the bus bar, between the eyelet and the connection terminal, and between the connection terminal and the bus bar, respectively. It is characterized by being joined by welding.
  • a grommet made of a metal such as brass is fixed to the terminal portion of the flexible printed circuit board in advance before welding. Then, the flexible printed circuit board is placed on one side of the bus bar, the connection terminal and the eyelet are brought into contact with the bus bar, one of the pair of electrodes is pressed against the eyelet, the other electrode is pressed against one side of the bus bar, Resistance welding is performed using a parallel energization system (see FIG. 1) while pressing the connection terminal against the bus bar with a push rod disposed between the electrodes.
  • the electrodes for resistance welding are pressed against the eyelet part and one side of the bus bar, respectively, and the push rod is used.
  • the present invention simultaneously secures the required welding strength between the eyelet and the bus bar and performs low resistance welding between the eyelet and the connection terminal, and between the connection terminal and the bus bar.
  • the flexible printed circuit board is joined to the bus bar of the vehicle battery module. Even if it does, it has high durability with respect to vehicle vibration and thermal expansion and contraction. It should be noted that it is difficult to obtain a structure that can withstand vibration and thermal expansion / contraction by a simple mechanical connection method other than the welding joining method.
  • a welding strength of a predetermined value or more can be stably secured between the eyelet and the bus bar, and a low resistance welding joint can be easily realized between the eyelet and the connection terminal and between the connection terminal and the bus bar. be able to.
  • a push rod that does not require energization is provided between the pair of electrodes set on the flexible printed circuit board side.
  • This push rod promotes the diversion of current from the eyelet portion to the connection terminal of the flexible printed circuit board, and performs low resistance welding between the base material of the connection terminal and the bus bar.
  • the push rod is formed to have a smaller diameter than the welding electrode, and the pressing force by the push rod is set to be higher than the pressing force by the electrode.
  • the contact resistance of the eyelet part and the contact resistance of the connection terminal part are optimally controlled by the balance between the pressure acting on the eyelet by pressing the electrode and the pressure acting on the connection terminal by pressing the push rod.
  • a structure that further promotes the shunting of the welding current to the connection terminal can be obtained.
  • the size of each contact resistance is set to have a predetermined difference. Thereby, between a connection terminal and a bus-bar can be more reliably welded, maintaining the high intensity
  • the manufacturing method of the present invention can also employ a so-called two-stage method in which an insulator is interposed between the eyelet and the bus bar during welding energization.
  • an insulator is interposed between the eyelet and the bus bar during welding energization.
  • connection terminal a circuit part with a copper foil part (connection terminal) joined to a bus bar by welding, between the connection terminal and the eyelet part,
  • connection terminal and the bus bar are joined together by resistance welding.
  • the eyelet portion is pressed against the bus bar side of one of the pair of electrodes, and an optimum pressure is applied to the eyelet portion, and the flexible printed circuit board is pressed against the bus bar side with the push rod to be a connection terminal of the flexible printed circuit board. Apply the optimum pressure.
  • the pressure and contact area acting on the eyelet part, and the pressure and contact area acting on the connection terminal are appropriate, taking into account the design items such as the size and material of the members such as the eyelet, connection terminal and bus bar. Set to.
  • the welding current supplied to the connection terminal is increased, and sufficient bonding strength between the high strength and low resistance flexible printed circuit board and the bus bar can be ensured by precision resistance welding.
  • a metal eyelet 26 is fixed in advance to a portion corresponding to the connection terminal in the flexible printed circuit board 25 before welding.
  • the number of the copper foil portions 23 that are connection terminals of the circuit portion may be one or plural, and the eyelets 26 are fixed to each copper foil portion 23. Then, between the eyelet 26 and the copper foil part 23 and between the copper foil part 23 and the bus bar 21 are joined by resistance welding.
  • FIG. 1 is an explanatory front view for explaining a state of welding joining between the flexible printed circuit board 25 and the bus bar 21 according to the present embodiment.
  • a bus bar 21 which is a thick metal plate, is supported by support means (not shown). From one end side of the upper surface of the bus bar 21, a polyimide base 22, a copper foil portion 23, and a polyimide cover 24. A three-layer flexible printed circuit board 25 is provided. The cover 24 is not formed in a portion corresponding to the bus bar 21. For this reason, the lower surface side of the copper foil part 23 where the cover 24 is not provided is exposed to the outside, and a part of the exposed surface of the copper foil part 23 is in surface contact with the lower surface of the bus bar 21.
  • a circular eyelet hole (not shown) is opened at a location where the cover 24 is not formed on the flexible printed circuit board 25.
  • a metal eyelet 26 formed in a ring shape is attached to the eyelet hole.
  • One end portion (left end portion in FIG. 1) of the copper foil portion 23 is in contact with a part of the outer peripheral surface of the eyelet 26 (lower portion of the right outer peripheral surface of the eyelet 26 in FIG. 1). *
  • the lower surface side portion of the eyelet 26 is in contact with the upper surface of the bus bar 21 so as to be conductive.
  • a copper-based metal such as brass can be adopted, but other highly conductive metal materials can be adopted as a matter of course.
  • a pair of electrodes 27 and 28 are arranged on the upper surface side of the bus bar 21 so as to be spaced apart from each other.
  • the tip portion of the left electrode 27 in FIG. 2 is in contact with the center position of the right arc portion on the upper surface of the eyelet 26, that is, the closest position to the electrode 28 in the arc portion.
  • the right electrode 28 is disposed in the vicinity of the right side of the flexible printed circuit board 25, and the tip of the electrode 28 is in contact with the upper surface of the bus bar 21 so as to be conductive.
  • a push rod 29 is provided at a substantially central position of an intermediate region connecting the electrode 27 and the electrode 28.
  • the tip of the push rod 29 is set so that the upper surface of the base 22 of the flexible printed circuit board 25 can be pressed downward.
  • the contact pressure, contact area, and contact position of the bush rod 29 with respect to the base 22 are set and changed according to the design items so as to obtain a required contact resistance.
  • the electrodes 27 and 28 and the push rod 29 are configured to be moved in the vertical direction by a vertical movement mechanism (not shown).
  • the eyelet 26 is assumed to be fastened to an eyelet hole formed in the flexible printed circuit board 25 with an eyelet punch in advance.
  • the flexible printed circuit board 25 is precision resistance welded to the bus bar 21
  • the flexible printed circuit board 25, the electrodes 27 and 28, and the push rod 29 are set on the upper surface side of the bus bar 21, as shown in FIG. That is, the terminal side portion of the flexible printed circuit board 2 is placed on the left end side of the upper surface of the bus bar 21 in FIG. 2, the lower surface of the copper foil portion 23 is brought into contact with the upper surface of the bus bar 21, and the upper surface side of the bus bar 21.
  • a pair of electrodes 27 and 28 are juxtaposed at a distance from each other.
  • the left electrode 27 is set so that the tip of the left electrode 27 is in contact with the right arc of the top surface of the eyelet 26 so as to be conductive with appropriate pressure, and the tip of the right electrode 28 is the top of the bus bar 21. Is set so as to be able to conduct at an appropriate pressure.
  • a push rod 29 is disposed in an intermediate region connecting the electrode 27 and the electrode 28, for example, at a substantially central position thereof.
  • the push rod 29 is set so that the tip thereof presses the upper surface of the base 22 of the flexible printed circuit board 25 with appropriate pressure.
  • resistance welding of the flexible printed circuit board 25 and the bus bar 21 is performed by energizing between the pair of electrodes 27 and 28.
  • the current flowing between the pair of electrodes 27 and 28 branches in the middle so as to move in the copper foil portion 23 and the bus bar 21 along another route.
  • the current path 30 is divided into two in the middle, and one of the routes on the bus bar 21 side is a path indicated by reference numeral 30a.
  • This current path 30 a passes only through the eyelet 26 and the bus bar 21, and each bus bar 21 includes the tip contact point of the electrode 27 with respect to the eyelet 26 and the bus bar 21 and the tip contact point of the electrode 28 with respect to the bus bar 21.
  • This route connects two corresponding internal points, and is the shortest distance in a direction parallel to the plane direction of the bus bar 21.
  • the other branch route on the copper foil portion 23 side of the current path 30 is a path indicated by reference numeral 30b.
  • this current path 30b a part of the welding current flowing in the thickness direction of the eyelet 26 branches from the outer peripheral surface of the eyelet 26 to the end of the copper foil part 23 in contact therewith, and the inside of the copper foil part 23 is After flowing in the thickness direction of the bus bar 21 at a position corresponding to the tip contact point of the push rod 29, the route flows and merges with the route on the bus bar 21 side.
  • a pair of electrodes 27 and 28 set on the flexible printed circuit board 25 side is fixed in advance with a grommet 26 made of a metal such as brass on the terminal portion of the flexible printed circuit board 25. Resistance welding is performed by a parallel energization method.
  • the copper foil portion 23 in the outer peripheral region of the eyelet 26 is pressed against and brought into contact with the bus bar 21 with the push rod 29, and resistance welding is performed by energizing in this state. As a result, it is possible to reliably weld the copper foil portion 23 and the bus bar 21 while maintaining high strength between the eyelet 26 and the bus bar 21.
  • the bus bar is not formed thin by joining three portions between the eyelet 26 and the bus bar 21, between the eyelet 21 and the copper foil portion 23, and between the copper foil portion 23 and the bus bar 21 by welding. As a whole, the bonding strength between the flexible printed circuit board 25 and the bus bar 21 is significantly increased.
  • the flexible printed circuit board 25 is used as an in-vehicle secondary battery module, it is possible to maintain durability for a long period of time against vibration and thermal expansion / contraction generated in the vehicle.
  • the push rod 29 set between the pair of electrodes 27 and 28 pushes down the copper foil portion 23 on the outer periphery side of the eyelet 26 so that the lower surface of the copper foil portion 23 is brought into contact with the upper surface of the bus bar 21 with an appropriate pressure.
  • the contact resistance between 26 and the bus bar 21 is detected by a measuring instrument, and the contact resistance between the copper foil portion 23 and the bus bar 26 is also detected by a measuring instrument.
  • the copper foil portion 23 and the bus bar 21 are welded, and the required bonding strength is reliably obtained. I can do it.
  • a push rod 29 that does not require energization is provided between the pair of electrodes 27 and 28, and the copper foil portion 23 is pressed against the upper surface of the bus bar 21 by the push rod 29.
  • the push rod 29 is a rod member having a smaller diameter than the pair of welding electrodes 27 and 28, and the pressing force of the push rod 29 is set to be higher than the welding electrodes 27 and 28 by a predetermined value. To do. Thereby, the shunting action of the welding current to the copper foil part 23 can be further promoted.
  • the manufacturing method of the flexible printed circuit board 25 of the present invention can adopt a two-stage method in addition to the one-shot method in which the eyelet 26 and the bus bar 21 are in direct contact with each other.
  • an insulator such as a rubber sheet is interposed between the eyelet 26 and the bus bar 21, and between the eyelet 26 and the copper foil part 23 and between the copper foil part 23 and the bus bar 21.
  • the insulator is removed, and the eyelet 26 and the bus bar 21 are welded and joined via the copper foil portion 23.
  • the flexible printed circuit board 25 to which the eyelet 26 is fixed is placed on the bus bar 21, the copper foil part 23 and the eyelet 26 are brought into contact with one side of the bus bar 21, and an insulator (not shown) is interposed between the eyelet 26 and the bus bar 21.
  • the electrode 27 is pressed against the eyelet 26
  • the electrode 28 is pressed against one surface of the bus bar 21
  • the copper foil portion 23 is connected to the bus bar 21 by the push rod 29 disposed between the electrodes 27, 28.
  • the eyelet 26 and the copper foil part 23 and the copper foil part 23 and the bus bar are welded.
  • the insulator is removed, and the eyelet 26 and the bus bar 21 are welded together.
  • a sufficient current is supplied to the copper foil portion 23 and the bus bar 21 of the flexible printed circuit board 25 to perform resistance welding, so that the upper surface of the copper foil portion 23 of the flexible printed circuit board 25 and the bus bar 21.
  • the lower surfaces are coupled to each other with a high bonding force.
  • the bonding strength between the flexible printed circuit board and the bus bar is greatly improved without forming the bus bar thinly. Therefore, for example, even when a flexible printed circuit board is bonded to a bus bar as an in-vehicle battery module, the bonding strength is not lowered by vibration or thermal expansion and contraction, and the function and quality of the flexible printed circuit board are stably maintained for a long period of time. be able to.
  • the flexible printed circuit board of the present invention can be easily mounted above the in-vehicle battery, and can sufficiently secure the bonding strength between the connection terminal of the flexible printed circuit board and the bus bar without forming the bus bar thin. I can do it.
  • connection terminal of the flexible printed circuit board by pressing the connection terminal of the flexible printed circuit board against the bus bar with a push rod disposed between the pair of electrodes, conducting resistance welding by energizing the pair of electrodes, The amount of current that branches and moves to the connection terminal side increases. As a result, the strength of the welded joint between the connection terminal of the flexible printed circuit board and the bus bar is further improved.
  • connection terminal which is the base material
  • the present invention is not limited to the three-layered flexible printed circuit board, and any flexible printed circuit board having a connection terminal provided with a connection terminal joined to a bus bar can be used. Further, it can be widely applied to electronic parts for various information equipment or precision equipment other than electronic parts for vehicles.
  • Bus bar 22
  • Base Copper foil part (circuit connection terminal) 24
  • Cover Flexible printed circuit board 26
  • Eyelet 26
  • Electrode 28
  • Electrode 29 Push rod 30 Current path

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)
  • Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
  • Combinations Of Printed Boards (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
PCT/JP2013/061875 2012-08-09 2013-04-23 フレキシブルプリント基板及びその製造方法 WO2014024524A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112013000132.2T DE112013000132T5 (de) 2012-08-09 2013-04-23 Flexible Leiterplatte sowie Verfahren zu deren Herstellung
CN201380002840.5A CN103766012B (zh) 2012-08-09 2013-04-23 柔性印刷电路板及其制造方法

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DE102021117573B4 (de) 2021-07-07 2023-04-13 Tdk Electronics Ag Verfahren zur Herstellung einer elektrischen Verbindung zu einem elektronischen Bauteil und einer Chip-Baugruppe

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