JP5524553B2 - Welding structure to bus bar and welding method to bus bar - Google Patents

Description

  The present invention relates to a welding structure for welding a conductor to a bus bar, and a welding method thereof.

  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 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 bus bar width or plate thickness is reduced in order to keep the heat dissipation of the bus bar low, the cross-sectional area perpendicular to the energizing direction is reduced, the conductor resistance of the bus bar is increased, and the product function is degraded.

  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 to provide a welded structure to a bus bar and a method for welding the same.

In order to achieve the above-described object, a welded structure to a bus bar according to the present invention is characterized by the following (1) to (3).
(1) A welding structure to a bus bar having a bus bar made of a metal plate through which an electric current flows and a conductor welded to the bus bar,
In the bus bar, a welded portion in which the strip portion is driven out to one side of the bus bar in a state where both ends of the strip portion formed by providing slits along the energizing direction are connected to the bus bar. Formed,
Contact points between the welded part and the conductor arranged in the welded part are welded,
about.
(2) In the welded structure to the bus bar configured as described in (1) above,
The welded part is twisted about its longitudinal axis.
(3) In the welded structure to the bus bar configured as described in (1) or (2) above,
The strip portion is punched to a thickness greater than the thickness of the bus bar.

In order to achieve the above-described object, a method for welding to a bus bar according to the present invention is characterized by the following (4) to (6).
(4) A welding method to a bus bar for welding a conductor to a bus bar made of a metal plate through which an electric current flows,
In the bus bar, a slit forming step of forming a slit along the energization direction to form a strip part,
A striking step of striking the strip portion to one side of the bus bar in a state where both ends of the strip portion are connected to the bus bar, and forming a welded portion;
A welding step in which the conductor is disposed in the welded portion, and a welding portion where the contact portion between the welded portion and the conductor is heated and welded;
Including.
(5) In the welding method to the bus bar having the configuration of (4) above,
Twist the welded part formed by the punching process around the longitudinal axis.
(6) In the method of welding to the bus bar having the configuration of (4) or (5) above,
In the punching step, the strip portion is stamped out to a thickness greater than the thickness of the bus bar.

In the welded structure to the bus bar having the above-described configurations (1) and (4), and the method for welding to the bus bar, a portion to be welded is formed by punching out a strip formed by forming a slit in the bus bar, Since the conductor is welded to the welded portion, the heat radiation from the welded portion can be suppressed to the extent that the heat is transmitted from both ends of the welded portion to the bus bar side.
In addition, by forming a slit along the energization direction, a strip portion to be welded is formed, so that even if the welded portion is formed, the cross-sectional area in the direction orthogonal to the energization direction is reduced. Nor.
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 welded structure to the bus bar and the method for welding to the bus bar having the configurations of (2) and (5) above, the welded portion is twisted about the longitudinal axis thereof to the corner of the welded portion. Conductors can be easily placed and welded. That is, the corner portion of the welded portion can be used as a bead portion, and the conductor can be favorably welded to the bead portion including the corner portion.
In the welding structure to the bus bar and the method of welding to the bus bar having the configurations of (3) and (6) above, the strip portion is driven out beyond the thickness of the bus bar, so that the welded portion is separated from the other portion of the bus bar. Therefore, the heat transfer from the welded part to the entire bus bar can be satisfactorily suppressed.

  According to the present invention, a welded structure to a bus bar capable of stably welding a conductor to a bus bar at a low cost without incurring a decrease in product function due to an increase in conductor resistance, and its quality A welding method 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 structure to the bus bar of the present invention is applied. It is a perspective view of the bus bar which formed the slit 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 to-be-welded 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 sectional drawing of the bus-bar at the time of the welding operation explaining the modification 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.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a bus bar to which a welded structure 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, is formed in a rectangular shape in plan view, and a current flows in the direction of arrow A along the longitudinal direction.

  The bus bar 11 has a welded portion 12 formed on one side thereof. The welded portion 12 has a width dimension that is sufficiently narrow with respect to the width dimension of the bus bar 11, and the upper surface 11 a side that is one surface of the bus bar 11 in a state where both ends thereof are coupled to the bus bar 11. It is protruded to.

  The welded portion 12 is formed in a trapezoidal shape that protrudes upward from the main body of the bus bar 11 (the portion excluding the welded portion 12 in the bus bar 11). The core wire (conductor) 23 exposed from the coating 22 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.

  FIG. 2 is a perspective view of a bus bar having slits for explaining the procedure of the welding method to the bus bar, FIG. 3 is a perspective view of the bus bar having a welded portion to explain the procedure of the welding method to the bus bar, and FIG. 4 is a bus bar. The perspective view of the bus bar at the time of the welding operation explaining the procedure of the welding method to FIG. 5, FIG. 5 is the AA sectional view in FIG. 4 explaining the procedure of the welding method to the bus bar.

  First, as shown in FIG. 2, a slit 31 is formed in the vicinity of one side portion of the bus bar 11 along the energization direction (arrow A direction in FIG. 1) in the bus bar 11 (slit forming step).

  If it does in this way, the strip part 32 in alignment with an electricity supply direction will be formed in the one side part of the bus-bar 11. FIG.

  Next, as shown in FIG. 3, the strip part 32 is driven out to the upper surface 11a side of the bus bar 11, and the trapezoidal welded part 12 having the linear part 12a is formed (launching step).

  Here, it is desirable that the launch dimension h of the thin piece portion 32 is larger than the plate thickness t of the bus bar 11, and in this way, the welded portion 12 may be other than the welded portion 12 of the bus bar 11. It is released in a state where there is a gap with respect to the part.

  Note that the formation of the slit 31 and the punching out of the strip portion 32 can be simultaneously performed by pressing.

  Thereafter, as shown by an arrow B in FIG. 3, the core wire 23 exposed at the end portion of the electric wire 21 is moved to the upper portion of the straight portion 12a of the welded portion 12 and arranged. And are welded (welding process).

  Specifically, as shown in FIG. 4 and FIG. 5, the welded portion 12 and the core wire 23 that are overlapped with each other are sandwiched by the electrode 41 from above and below with a predetermined pressing force, and in this state, the electrode 41 A current is passed between them. If it does in this way, the to-be-welded part 12 and the core wire 23 will mutually fuse | melt and join with the Joule heat which generate | occur | produced with the electric current.

  At this time, since the welded portion 12 is composed of the strip portion 32 punched out from the bus bar 11, the heat radiation from the welded portion is suppressed to the extent that it is transmitted from both ends of the welded portion 12 to the bus bar 11 side.

  Thus, according to the welding method to the bus bar according to the above embodiment, the strip portion 32 formed by forming the slit 31 in the bus bar 11 is punched to form the welded portion 12, and this welded portion. 12, the core wire 23 of the electric wire 21 is welded, so that the heat radiation from the welded portion can be suppressed to the extent that the heat is transmitted from both ends of the welded portion 12 to the bus bar 11 side as indicated by an arrow C in FIG.

  Moreover, since the slit part 31 used as the to-be-welded part 12 is formed by forming the slit 31 along an energization direction, even if the to-be-welded part 12 is formed, the cross-sectional area of the direction orthogonal to an energization direction is reduced. There is no such thing as letting you.

  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.

  Further, if the strip portion 32 is driven out to a thickness t or more of the bus bar 11, the welded portion 12 can be reliably separated from other portions of the bus bar 11 other than the welded portion 12. Heat transfer to the entire bus bar 11 can be satisfactorily suppressed.

In addition, the bead part which protrudes upwards may be formed in the to-be-welded part 12 by press work, and welding with the core wire 23 can be performed more favorably by forming a bead part in this way.
Here, as the welded part 12 has a smaller width dimension, it is possible to reduce the heat dissipation during welding. However, if the width dimension is too small, a bead part is formed in the welded part 12 by press working. Difficult to do.

  Thus, the welding method to the bus-bar considering the case where formation of the bead part to the to-be-welded part 12 is difficult is demonstrated as a modification.

  FIG. 6 is a cross-sectional view of the bus bar during a welding operation for explaining a modification of the welding method to the bus bar.

  As shown in FIG. 6, in the welding method according to the modified example, after the welded portion 12 to which the core wire 23 is welded is punched out, the welded portion 12 is centered on the longitudinal axis thereof as indicated by the arrow D in FIG. 6. Twist approximately 45 ° in the direction. And the corner | angular part 12b of the to-be-welded part 12 is arrange | positioned above and below the bus-bar 11 by twisting the to-be-welded part 12 in this way. The welded part 12 may be twisted in the opposite direction.

  Thereafter, the core wire 23 is disposed at the corner 12b of the welded portion 12, and the welded portion 12 and the core wire 23 that are overlapped with each other are sandwiched between the electrodes 41 from above and below by a predetermined pressing force. A current is passed through the welded portion 12 and the core wire 23 to be welded.

  According to this modification, the welded part 12 can be welded by easily disposing the core wire 23 on the corner part 12b of the welded part 12 by twisting the welded part 12 about 45 degrees around the longitudinal axis. .

  That is, even if it is a case where a bead part cannot be formed by press work because the width dimension of the to-be-welded part 12 is small, the corner | angular part 12b of the to-be-welded part 12 uses this corner | angular part 12b as a bead part. The core wire 23 can be favorably welded to the bead portion.

  Therefore, the width dimension of the welded part 12 can be made as small as possible, thereby further reducing the heat radiation at the welded part 12.

  In the above embodiment, the slit 31 is formed at one place near the one side of the bus bar 11 to form the strip 32. For example, the slit is formed at two places near the center of the bus bar 11 in the width direction. 31 may be formed in parallel to the energization direction (the direction of arrow A in FIG. 1) to form the strip portion 32.

  Moreover, in the said embodiment, although resistance welding (spot welding) which pinches | interposes a welding location with the electrode 41 and flows an electric current between the electrodes 41 was demonstrated as an example, as a welding system, a welding location 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. 7 is a perspective view of the bus bar formed with a protrusion, FIG. 8 is a perspective view of the bus bar during welding work, and FIG. 9 is a cross-sectional view taken along line BB in FIG.

  In this reference example, as shown in FIG. 7, 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. 8 and 9, the core wire 23 of the electric wire 21 is arranged on 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 point is transmitted from the welding point to the entire bus bar 11 as shown by the arrow E in FIGS. 8 and 9, 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.

  Further, in order to keep the heat dissipation of the bus bar 11 in the reference example low, the width and thickness of the bus bar 11 must be reduced. Thus, when the width of the bus bar 11 is reduced, the width of the bus bar 11 decreases in the energizing direction. An orthogonal cross-sectional area is reduced, the conductor resistance of the bus bar 11 is increased, and the product function is deteriorated.

  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)
12 Welded part 23 Core wire (conductor)
31 Slit 32 Thin strip t Thickness

Claims (6)

A bus bar having a bus bar made of a metal plate through which an electric current flows and a conductor welded to the bus bar,
In the bus bar, a welded portion in which the strip portion is driven out to one side of the bus bar in a state where both ends of the strip portion formed by providing slits along the energizing direction are connected to the bus bar. Formed,
Contact points between the welded part and the conductor arranged in the welded part are welded,
A welded structure to a bus bar.   The welded structure to the bus bar according to claim 1, wherein the welded portion is twisted about a longitudinal axis thereof.   The welded structure to the bus bar according to claim 1 or 2, wherein the strip portion is punched out to a thickness greater than a thickness of the bus bar. A welding method to a bus bar for welding a conductor to a bus bar made of a metal plate through which an electric current flows,
In the bus bar, a slit forming step of forming a slit along the energization direction to form a strip part,
A striking step of striking the strip portion to one side of the bus bar in a state where both ends of the strip portion are connected to the bus bar, and forming a welded portion;
A welding step in which the conductor is disposed in the welded portion, and a welding portion where the contact portion between the welded portion and the conductor is heated and welded;
A method of welding to a bus bar, comprising:   The method for welding to a bus bar according to claim 4, wherein the welded portion formed by the punching step is twisted about a longitudinal axis thereof.   The welding method to the bus bar according to claim 4 or 5, wherein, in the punching step, the strip portion is punched to a thickness equal to or greater than a plate thickness of the bus bar.

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