JP5538842B2 - Welding method to bus bar - Google Patents

Description

  The present invention relates to a welding method for welding a conductor to a bus bar.

  As a technique for connecting a conductor made of a core of an electric wire to a bus bar, there is a technique in which a crimped portion bulged in a curved shape is formed in a part of the bus bar, and the crimped portion is pressed and crushed through the core wire of the electric wire (for example, , See Patent Document 1).

  Also, when welding busbars or busbars and tab terminals, there is a technology that forms a protrusion at one of the welding points and concentrates the welding pressure and current during energization on the protrusion to improve weldability. It is known (for example, see Patent Documents 2 to 5).

JP 2008-11777 A JP 2000-324657 A JP 2001-45634 A JP 2002-95134 A JP 2006-50830 A

  By the way, when connecting the core wire of an electric wire to a bus bar by crimping, a complicated operation of forming a curved crimp portion on the bus bar and pressing the crimp portion through the core wire is required.

  For this reason, it is conceivable to connect the core wire of the electric wire to the bus bar, but even if a protrusion is formed at the welded portion with the core wire of the bus bar, the bus bar has high heat dissipation, and it is difficult to generate heat during welding. Therefore, it is difficult to stably perform welding with the core wire of the electric wire, resulting in a decrease in welding quality. Moreover, there is much power consumption at the time of welding, and it causes a cost increase.

  Further, if the width and thickness of the bus bar are reduced in order to keep the heat dissipation of the bus bar low, the cross-sectional area of the energization effective path is reduced, the conductor resistance of the bus bar is increased, and the product function is lowered.

  The present invention has been made in view of the above-described circumstances, and its purpose is to stably weld a conductor to a bus bar at a low cost without incurring a decrease in product function due to an increase in conductor resistance. It is an object of the present invention to provide a method for welding to a bus bar capable of increasing the resistance.

In order to achieve the above-mentioned object, the welding method to the bus bar according to the present invention is characterized by the following (1) or (2).
(1) A welding method to a bus bar in which two terminals are connected and a conductor connected to a branch circuit or a measuring instrument is welded to a bus bar made of a metal plate in which a current flows through an effective energization path between the terminals. There,
In the corner of a position deviated from the current effective path of the bus bar, and the strip portion forming step of forming a slit to form the strips extending up to the end of the bus bar,
A welding step in which the conductor is disposed in the strip portion, and a contact portion between the strip portion and the conductor is heated and welded;
including.
(2) In the welding method to the bus bar having the configuration of (1) above,
Forming a bead portion protruding from one surface of the strip portion and welding the conductor to the bead portion.

In the method of welding to the bus bar having the configuration (1), a slit is formed on the bus bar by forming a slit extending to one end of the bus bar, and a conductor is welded to the strip. Heat transfer to the bus bar can be minimized.
Further, since the strip portion is formed by forming the slit at a position deviating from the energization effective path, even if the strip portion is formed, the cross-sectional area of the energization effective path is not reduced.
Thereby, in order to suppress heat dissipation, by reducing the width and thickness of the bus bar, it is possible to stably weld without increasing the conductor resistance of the bus bar and deteriorating the product function.
In addition, since the heat radiation amount at the welding point can be suppressed as much as possible, the power required for welding can be suppressed and the cost can be reduced.
In the method of welding to the bus bar having the configuration of (2) above, the conductor can be easily arranged on the bead portion of the strip portion protruding from the one surface side and can be favorably welded.

  ADVANTAGE OF THE INVENTION According to this invention, the welding method to the bus bar which can weld a conductor to a bus bar stably and can improve weld quality without incurring the fall of product function by increase in conductor resistance can be provided. .

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

It is a perspective view of the bus bar to which the welding method to the bus bar of the present invention is applied. It is a perspective view of the bus bar which formed the strip part explaining the procedure of the welding method to the bus bar of this invention. It is a perspective view of the bus bar which formed the bead part in the thin piece part explaining the procedure of the welding method to the bus bar of this invention. It is a perspective view of a bus bar at the time of welding operation explaining a procedure of a welding method to a bus bar of the present invention. It is AA sectional drawing in FIG. 4 explaining the procedure of the welding method to the bus-bar of this invention. It is a perspective view of the bus bar which formed the protrusion explaining a reference example. It is a perspective view of the bus bar at the time of welding work in a reference example. It is BB sectional drawing in FIG.

  Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a bus bar to which the method for welding to a bus bar of the present invention is applied.

  As shown in FIG. 1, the bus bar 11 is a plate material made of copper, a copper alloy, or the like, and is formed in a rectangular shape in plan view.

  Two terminal mounting holes 12 are formed in the bus bar 11, and terminals (not shown) are fixedly connected to the terminal mounting holes 12 by, for example, bolts and nuts. And an electric current is sent in the electricity supply effective path | route A between the terminal attachment holes 12 to which the terminal was connected.

  A strip 15 is formed at one end of the bus bar 11 at a position deviating from the energization effective path A. The strip 15 is a section separated from the main body of the bus bar 11 by one slit extending to one end of the bus bar 11. The strip 15 has a width that is sufficiently narrower than the width of the bus bar 11, and one end of the strip 15 is connected to the bus bar 11.

  Further, the strip portion 15 is formed with a bead portion 16 that protrudes upward from the upper surface 11a side, which is one of the surfaces, and the bead portion 16 extends from the coating 22 at the end of the electric wire 21. The exposed core wire (conductor) 23 is welded. The electric wire 21 is used, for example, for measuring a branch circuit of the bus bar 11 or a voltage drop, and is connected to the measuring instrument at the time of measurement by the measuring instrument.

  Next, the case where the core wire 23 of the electric wire 21 is welded to the bus bar 11 will be described.

  2 is a perspective view of a bus bar formed with a strip portion for explaining the procedure of the welding method to the bus bar, and FIG. 3 is a perspective view of the bus bar with a bead portion formed on the strip portion for explaining the procedure of the welding method to the bus bar. 4 is a perspective view of the bus bar during the welding operation for explaining the procedure of the welding method to the bus bar, and FIG. 5 is a cross-sectional view taken along the line AA in FIG. 4 for explaining the procedure of the welding method to the bus bar.

  First, as shown in FIG. 2, a slit 30 is formed at one end portion of the bus bar 11 that is located away from the energization effective path A in the bus bar 11 in which the terminal mounting hole 12 is formed, and the one end portion is connected to the bus bar 11. The formed strip portion 15 is formed (strip portion forming step).

  Next, as shown in FIG. 3, a bead portion 16 projecting upward is formed on the thin piece portion 15 (bead forming step).

  The formation of the strip portion 15 and the punching out of the bead portion 16 can be simultaneously performed by press working.

  Thereafter, the core wire 23 exposed at the end of the electric wire 21 is placed on the upper portion of the bead portion 16 of the strip portion 15, and the strip portion 15 and the core wire 23 are welded (welding process).

  Specifically, as shown in FIGS. 4 and 5, the bead portion 16 and the core wire 23 of the strip portion 15 that are overlapped with each other are sandwiched by the electrode 41 from above and below with a predetermined pressing force, and this state is maintained. Thus, a current is passed between the electrodes 41. If it does in this way, the bead part 16 and the core wire 23 of these strip parts 15 will mutually fuse | melt by the Joule heat which generate | occur | produced with the electric current, and will join.

  At this time, the heat radiation from the welded portion is suppressed to the extent that it is transmitted from one end of the strip 15 to the bus bar 11 side.

  Thus, according to the welding method to the bus bar which concerns on the said embodiment, the strip part 15 is formed by forming the slit 30 in the bus bar 11, and the core wire 23 of the electric wire 21 is welded to this strip part 15. FIG. Therefore, as shown by the arrow C in FIG. 4, the heat radiation from the welded portion can be suppressed to the extent that it is transmitted from the connecting portion with the bus bar 11 at one end of the strip portion 15.

  Further, since the slit portion 15 is formed by forming the slit 30 at a position deviated from the energization effective path A, the cross-sectional area of the energization effective path A is reduced even if the strip portion 15 is formed. There is nothing.

  Thereby, in order to suppress heat radiation, the width and thickness of the bus bar 11 can be reduced, so that the conductor resistance of the bus bar 11 can be increased and stable product welding can be performed without causing deterioration of the product function.

  In addition, since the heat radiation amount at the welding point can be suppressed as much as possible, the power required for welding can be suppressed and the cost can be reduced.

  In particular, the core wire 23 can be easily disposed on the bead portion 16 of the strip portion 15 protruding toward the upper surface 11a side and can be welded satisfactorily.

  In the above embodiment, resistance welding (spot welding) in which welding is performed by sandwiching a welding point by the electrode 41 and flowing current between the electrodes 41 has been described as an example. However, as a welding method, the welding point is heated. If it does, it is not limited to resistance welding.

  Here, in order to explain the further superiority of the present invention, reference examples are shown in FIGS.

  FIG. 6 is a perspective view of the bus bar formed with a protrusion, FIG. 7 is a perspective view of the bus bar during welding work, and FIG. 8 is a cross-sectional view taken along the line BB in FIG.

  In this reference example, as shown in FIG. 6, first, a bead portion 51 that protrudes toward the upper surface 11 a of the bus bar 11 is formed on the bus bar 11 by pressing. Then, as shown in FIGS. 7 and 8, the core wire 23 of the electric wire 21 is disposed in the bead portion 51, and is sandwiched and welded by the electrode 41 from above and below.

  In the case of this reference example, the heat generated at the welding location is transmitted from the welding location to the entire bus bar 11 as shown by the arrow E in FIGS. 7 and 8, and stable welding is difficult. It becomes. Therefore, in the reference example, in order to generate sufficient heat for welding, a large current is required as a current flowing between the electrodes 41, power consumption is increased, and the cost is increased.

  Moreover, in order to keep the heat dissipation of the bus bar 11 in the reference example low, the width and the plate thickness of the bus bar 11 must be reduced. However, if the width and the plate thickness of the bus bar 11 are reduced in this way, the energization effective path As a result, the conductor resistance of the bus bar 11 increases and the product function deteriorates.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

11 bus bar 11a upper surface (one surface)
15 Fine strip portion 16 Bead portion 23 Core wire (conductor)
30 slit A energization effective path

Claims (2)

A welding method to a bus bar in which a conductor connected to a branch circuit or a measuring instrument is welded to a bus bar made of a metal plate to which two terminals are connected and a current flows in an energization effective path between the terminals ,
In the corner of a position deviated from the current effective path of the bus bar, and the strip portion forming step of forming a slit to form the strips extending up to the end of the bus bar,
A welding step in which the conductor is disposed in the strip portion, and a contact portion between the strip portion and the conductor is heated and welded;
A method of welding to a bus bar, comprising:   2. The method for welding to a bus bar according to claim 1, wherein a bead portion protruding from the one surface of the strip portion is formed, and the conductor is welded to the bead portion.

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