JP2008284560A - Wire straightening device and solar cell assembly device - Google Patents

Abstract

It is possible to correct deformations such as warpage in the longitudinal direction and bending in the width direction of a wire with a small facility without increasing the yield strength of the wire.
SOLUTION: Wire rod drawing means for drawing a wire wound in a coil shape, a plurality of straightening rolls provided along the wire drawing direction and staggered in the thickness direction of the wire, and the straightening The groove 20 has a groove width that is substantially the same as the width of the wire provided on the roll, and is provided with a groove that bends in the thickness direction of the drawn wire and restricts deformation in the width direction.
[Selection] Figure 1

Description

  The present invention relates to a wire straightening device and a solar cell assembling device, and more particularly to a wire straightening device for straightening a deformed wire rod such as warping or meandering, and to lead solar cells using the wire straightening device. The present invention relates to an assembling apparatus for solar cells connected via wires.

  A wire rod such as a plate having a large width-thickness ratio (width / thickness) is generally stored and transported in a state of being wound around a bobbin or the like. For example, a solder-plated rectangular wire used as a conductor for collecting power generated by a solar cell is also included in the above-described wire, and is supplied by being wound around a bobbin or the like. The following two methods are used as the main manufacturing methods of such a wire. One is a method of cutting from a wide plate material by a slitter in which a pair of blades are arranged vertically. The other is a method of manufacturing by rolling round wires.

  Here, in the wire obtained by the cutting method by the slitter, due to non-uniformity when cutting both sides of the wire, and in the wire obtained by the rolling manufacturing method, the rolling condition in the wire width direction is non-uniform. As a result, as shown in FIG. 10A, deformation 81 such as bending or meandering is formed in the wire width direction of the wire 80. Further, the wire rod is attached with curl due to winding around the bobbin, and as shown in FIG. 10B, warping (curving) 91 occurs in the longitudinal direction of the wire rod 80. Even after the lead wire used for assembling the solar battery cell is unwound from the bobbin, warping remains. When assembling a solar battery cell with warping remaining, there is a problem that the lead wire is caught during transportation, and the lead wire is deformed such as bending, meandering, or warping.

Therefore, various wire rod straightening devices for correcting such deformations such as bending, meandering, and warping have been conventionally proposed.
For example, as shown in FIG. 11, there is a stretcher-type device that clamps one end of a wire 80 with a fixing jig 82 and pulls the other end of the wire 80 with a moving jig 83 to apply tension, thereby extending the wire. . Further, as shown in FIG. 12, there is a roller leveler apparatus in which a plurality of horizontal rolls 101 as roll levelers (correcting rolls) are arranged in a zigzag pattern along the drawing direction of the wire 80 above and below the wire 80. As a straightening device of the same type, there is also a tension leveler type device in which bridle rolls for applying tension are arranged before and after the horizontal roll, although not shown. Furthermore, a plurality of horizontal rolls 101 arranged in a zigzag pattern in the vertical direction along the drawing direction of the wire 80 as shown in FIG. 13 and a plurality of vertical rolls 102 provided on both sides in the width direction of the wire are provided. There is an improved roller leveler device that corrects not only the shape of the wire in the longitudinal direction but also the shape in the width direction.

  When the wire straightened by the wire straightening device as described above is used, for example, as a lead wire for connecting silicon solar cells to each other, they are solder-connected to the solar cells. In this case, a wire based on copper is generally used in consideration of conductivity. However, since the thermal expansion coefficients of silicon and copper-based wire are greatly different, warpage due to thermal stress occurs in the solar cells after solder connection. Therefore, in order to prevent this, a wire material having a reduced proof stress is used. This is for ensuring the flexibility of the wire and reducing the warpage of the solar battery cell.

One of the facilities having the above-mentioned wire straightening device is a solar cell assembly device. In a solar cell assembling apparatus, a stretcher structure system shown in FIG. 11 has generally been adopted as an apparatus for removing deformation such as warping of a wire rod. This is because a straightening roll is not used, and deformation such as warping of the lead wire and bending in the width direction can be corrected with a relatively simple structure.

  However, in the stretcher system, tension is applied to stretch the material, thereby reducing the internal residual stress distribution, making the residual stress uniform, and flattening the shape of the wire. For this reason, even if it used the wire which reduced the yield strength, there existed a fault that elongation was given to the wire and the yield strength increased because the wire material caused work hardening. As a result, there is a problem that the solar battery cell warps when it is soldered to the solar battery cell.

  Therefore, a roller leveler type shown in FIG. 12 can be considered as an alternative to the stretcher method. The roller leveler type is a system in which a wire rod is passed through a plurality of horizontal rolls 101 arranged one above the other. Therefore, the roller leveler method is effective in correcting the curvature in the longitudinal direction of the wire rod, such as winding around a bobbin. Also, with this method, the shape can be corrected by plastically deforming only a part of the wire in the thickness direction and balancing the stress distribution. Thus, since the effect of shape correction can be obtained while suppressing work hardening, the warpage of the solar battery cell can be reduced. However, since correction is performed only with the horizontal roll 101, it is difficult to correct meandering, which is deformation in the width direction.

  Therefore, as shown in FIG. 13, a vertical roll 102 is arranged in addition to the horizontal roll 101 as shown in FIG. 13, thereby correcting not only the deformation in the longitudinal direction of the wire but also the deformation in the width direction. An improved roller leveler type device has been proposed (see, for example, Patent Document 1). According to this, when correcting the curvature of a wire longitudinal direction, there exists a merit which does not receive the width | variety restrictions of the wire to be used. In this method, as shown in the figure, a guide 103 is provided on the vertical roll 102. However, when the width is corrected, the wire 80 receives a lateral force from the vertical roll 102 and rolls over. It is for preventing.

Further, as shown in FIG. 14, in the improved roller leveler type apparatus, the pressing mechanism 105 is provided in the vertical roll 102 in the wire width direction in one step, and even if the width direction size of the wire 80 changes, the vertical roll 102 is also performed.
JP2007-44734

  However, in the technique described in Patent Document 1 described above, although it is possible to prevent an increase in the yield strength of the wire, the number of correction rolls to be adjusted is increased, the equipment is enlarged, and the workability is poor. There was a problem of becoming. Further, in the case where the pressing mechanism is provided, there is a problem that the equipment is enlarged and the wire is deformed depending on the adjustment. These problems are common to wires other than a plate having a large width with respect to the thickness.

An object of the present invention is to provide a wire straightening device capable of correcting deformation such as warpage in the longitudinal direction and bending in the width direction of the wire with a small facility without increasing the yield strength of the wire.
Another object of the present invention is to provide a solar cell assembling apparatus capable of effectively correcting the shape of a solar cell lead wire using the wire straightening device described above.

  According to the aspect of the present invention, the wire drawing means for drawing the wire wound in a coil shape, and a plurality of correction rolls provided along the drawing direction of the wire and alternately provided in the thickness direction of the wire. And a groove having a groove width substantially the same as the width of the wire provided on the straightening roll, wherein the groove is bent in the thickness direction of the drawn wire and restricts deformation in the width direction. Provided is a wire straightening device.

  The concave groove may have a groove width and a depth corresponding to the wire having a width / thickness ratio of 1 to 60. Moreover, it is preferable to round or chamfer the corner portion of the groove opening where the groove side surface of the groove and the surface of the correction roll not provided with the groove intersect. Moreover, it is preferable that the roundness of the corner of the groove opening is 0.05 mm to 2 mm. Moreover, it is preferable that the chamfer dimension of the corner portion of the groove opening is 0.05 mm to 2 mm.

  The grooved correction roll provided with the concave groove is provided with a convex locking portion or a concave locked portion on both end surfaces, and the side surface of the cylindrical roll forms the bottom surface of the ring-shaped concave groove. A roll main body and a ring plane that respectively faces the both end faces of the roll main body to form a side surface of the concave groove, and a locking portion or a locked portion of the roll main body is locked to the ring plane; A pair of ring-shaped guide rings having a concave locked portion or a convex locking portion, and the locked portion of the guide ring is connected to the locking portion or the locked portion of the roll body. Alternatively, the locking portion can be removably locked.

  It is preferable to provide tension loading means for applying tension to the wire on the upstream side of the straightening roll in the drawing direction of the wire. Moreover, it is preferable to provide a movable roller that applies tension to the wire by its own weight on the upstream side of the straightening roll in the drawing direction of the wire.

  Provided is a solar cell assembling apparatus for electrically connecting adjacent solar cells via lead wires, the solar cell assembling apparatus including the above-mentioned wire straightening device as the lead wire correcting apparatus. it can.

According to the wire straightening device of the present invention, deformation such as warpage in the longitudinal direction and bending in the width direction of the wire can be corrected with a small facility without increasing the yield strength of the wire.
Moreover, according to the solar cell assembly device of the present invention, since the wire rod straightening device of the present invention is used, the shape of the lead wire for the solar cell can be effectively corrected.

  A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a schematic diagram of a wire rod straightening device according to a preferred embodiment of the present invention. 1A is a plan view, and FIG. 1B is a side view.

  As shown in FIGS. 1 (a) and 1 (b), the wire straightening device 10 according to the present embodiment is arranged in the horizontal direction (FIG. 1 (a), FIG. 1 (b) is provided with wire rod drawing means (not shown) drawn in the left-right direction). The flat wire 11 referred to here is a wire having a width to thickness ratio (width / thickness) of 1 or more, and includes a plate having a width wider than the thickness and a wire having a substantially square cross section. . Further, the wire rod drawing means can be constituted by, for example, a motor, a screw rod that is rotated by the motor, a wire rod clamp that moves forward and backward with the rotation of the screw rod, etc. -298096).

Further, the wire straightening device 10 is provided as upper and lower portions in the thickness direction of the flat wire 11 drawn in the horizontal direction, and as a straightening roll arranged in a staggered manner, for example, in a staggered manner along the drawing direction of the flat wire 11. A plurality of horizontal rolls 12 are provided. These horizontal rolls 12 are rotatable.
A ring-shaped concave groove 20 for correcting deformation in the longitudinal direction of the wire and the width of the wire is formed on the entire circumference of the side surface of the horizontal roll 12. The concave groove 20 is provided in an intermediate portion on the inner side from both ends of the roll. The concave groove 20 can be formed, for example, as an integrally machined structure from a columnar roll (including a cylindrical roll). In this manner, the horizontal roll 12 is a grooved horizontal roll.

  The groove shape of the recessed groove 20 is preferably flat so that the flat bottom surface of the groove is in line contact with the groove, and the side surface of the groove is a rectangular section perpendicular to the bottom surface of the groove. The groove width of the rectangular groove 20 is substantially the same as the width of the flat wire 11. Further, the depth of the concave groove 20 is preferably shallower than the thickness of the flat wire 11. This is because if the depth of the concave groove 20 is shallower than the thickness of the flat wire 11, the adjacent arrangement distance between the horizontal rolls 12 can be approached as much as possible. In addition, when the depth of the ditch | groove 20 is too shallow, it will run on the horizontal roll 12 of the ditch | groove 20 outer side, and is unpreferable. Therefore, the depth of the groove 20 is set to such a depth that the pressing force applied to the flat wire 11 from both sides in the wire thickness direction is optimized by the bottom surface of the groove 20 of the horizontal roll 12 arranged above and below. It is good.

  Next, the operation of the present embodiment will be described.

  The flat wire 11 wound in the shape of a coil on a bobbin or the like is pulled out in the horizontal direction by the wire drawing means, and is passed through the concave grooves 20 between the plurality of horizontal rolls 12 arranged in a staggered manner. Then, the flat wire 11 is bent back in the thickness direction of the flat wire 11 by the pressing force from the bottom surface of the concave groove 20 of the plurality of horizontal rolls 12, and the curve (warp) in the longitudinal direction of the wire is corrected. . At this time, the deformation in the wire width direction of the flat wire 11 is also restricted by the pressing force from both side surfaces of the concave groove 20 of the horizontal roll 6, thereby correcting the deformation in the width direction such as meandering and bending simultaneously.

  As described above, the flat wire 11 is passed through the plurality of horizontal rolls 12 in a state in which the movement in the vertical direction and the horizontal direction is suppressed and restricted by the concave grooves 20 provided in each horizontal roll 12. As a result, not only the warp in the longitudinal direction, which is a deformation in the longitudinal direction of the wire, but also the meandering, which is a deformation in the width direction of the wire, can be corrected, and a straight wire that has improved flatness and eliminated curling and the like. can get.

  In addition, the grooved horizontal roll 12 in the wire straightening device 10 according to the present embodiment is smaller in size by omitting the vertical roll as compared with the improved roller leveler type device (see FIG. 13) in the conventional wire straightening device. And workability is also improved. Therefore, the wire straightening device 10 can be easily incorporated into existing and existing facilities.

  Also, with the conventional stretcher type, the tensile force is applied to the flat wire material and plastic deformation is carried out so that permanent strain remains, so the proof stress of the wire material has increased. Since it is straightening and plastic deformation is not performed, an increase in the yield strength of the flat wire can be suppressed.

  Here, when the flat wire is a solar cell lead wire, the 0.2% proof stress value is mainly “9 OMpa or less”. This is because when the pressure is greater than 90 MPa, it can be handled to some extent by a conventional wire straightening device.

  In addition, although the diameter of the roll of the horizontal roll 12 is suitably changed according to the thickness of the flat wire 11, it is 50 to 500 times of the thickness of the flat wire 11, Preferably it is 100 to 300 times, More preferably Is 150 to 250 times. If the roll diameter is too small, the effect of correcting the deformation is too strong, and new deformation may occur. On the other hand, if the roll diameter is too large, the effect of correcting the deformation is insufficient, and the amount of residual deformation becomes large.

FIG. 2 shows an embodiment of the concave groove 20 provided in the horizontal roll 12. The horizontal roll 12 is obtained by performing rounding R (FIG. 2 (c)) or chamfering C (FIG. 2 (d)) on the edge portion (A portion) that the flat wire 11 touches. Here, the edge portion (A portion) is a corner portion of the groove opening where the groove side surface of the groove 20 and the surface of the horizontal roll 12 where the groove 20 is not provided intersect. Further, the surface of the horizontal roll 12 where the concave groove 20 is not provided is constituted by guide rings 21 which are provided at both ends of the horizontal roll 12 and have a larger diameter than the inside of the roll where the concave groove 20 is provided.
The rounding R dimension or the chamfering C dimension are both preferably in the range of 0.05 mm to 2.0 mm. If it is smaller than 0.05 mm, the side surface in the width direction of the flat wire 11 will be scraped. Conversely, if it is larger than 2.0 mm, the flat wire 11 will ride on the guide ring 21 above the groove 20 of the roll. This is because the shape cannot be corrected.

  By the way, if the concave groove 20 has an integrally cut structure from a cylindrical roll as described above, the width of the concave groove cannot be changed. If the width of the concave groove cannot be changed, the dimension in the width direction of the flat wire 11 is restricted, so that the change in the width direction size of the flat wire 11 cannot be easily followed. Therefore, it is preferable that even if there are a plurality of types in the width direction, it is possible to easily follow the width direction size of the flat wire 11.

  FIG. 3 shows a modification of the present embodiment that can easily follow the size in the width direction of such a flat wire 11. The guide rings 21 provided at both ends of the horizontal roll 12 shown in FIG. 3A can be removed, and the length W of the processed portion of the horizontal roll 12 can be changed.

That is, as shown in FIGS. 3B and 3C, the grooved horizontal roll 12 has a fitting structure constituted by a roll body 22 and a pair of guide rings 21.
The roll bodies 22 and 22a are columnar and have convex locking portions 24 and 24a on both end surfaces, and the entire circumference of the side surfaces 23 and 23a constitutes the bottom surface of the ring-shaped concave groove 20. The convex locking portions 24 and 24a are, for example, roll shafts having a diameter smaller than the diameter of the roll main bodies 22 and 22a constituting the bottom surface of the concave groove 20.
The guide ring 21 has a ring shape and has ring planes that respectively face the both end surfaces of the roll main bodies 22 and 22a to form the side surfaces of the concave grooves 20, and the locking portions 24 and 24a of the roll main body 22 are formed on the ring plane. Has a recessed locked portion 25 to be locked. The recessed locked portion 25 is, for example, a locking hole into which the roll shaft is inserted.
By locking the locked portion 25 of the guide ring 21 to the locking portions 24 and 24a of the roll body 22, the grooved horizontal roll 12 shown in FIG. 3A is assembled. The roll bodies 22 and 22a are removable from the guide ring 21.

If the horizontal roll 12 is such a grooved roll that can be assembled, a plurality of types of roll bodies 22 and 22a (W1 <W2) having different lengths are prepared as shown in FIGS. By setting it, the length of the horizontal roll 12 can be changed easily.
Therefore, if the horizontal roll 12 has such a structure, when correcting the flat wire 11 having different dimensions in the wire width direction, it is possible to easily cope with different wire widths and provide a conventional pressing mechanism. As compared with, both ends of the flat wire are not deformed because an excessive force is not applied in the width direction of the wire.

In addition, the edge portion (B portion) with which the end portion in the width direction of the flat wire 11 comes into contact is always rounded by normal machining in the case of an integrally machined structure (FIG. 3D). The roundness R may deform the flat wire. Here, the edge portion (B portion) is a corner of the bottom of the groove where the bottom surface of the groove 20 and the side surface of the groove 20 intersect. However, in the combined structure of the present embodiment, since the ring plane of the guide ring 21 is abutted against the end surfaces of the roll bodies 22 and 22a, the rounded portion R does not remain in the B portion, so that the flat wire is deformed. (FIG. 3 (e)).

FIG. 4 shows a modification of the wire rod straightening device 10. In this modified example, tension loading means 30 for applying tension to the flat wire 11 is provided on the upstream side of the horizontal wire 12 in the drawing direction of the flat wire 11. The tension loading means 30 includes a roll that can move up and down, for example, a tension applying roll 31 and a guide roll 32, and tension is applied to the flat wire 11 by its own weight. . Due to this tension load, the flat wire 11 can be pulled out stably, and there is no risk of variations when correcting deformation in the wire width direction and the wire longitudinal direction, and a straighter wire 11 can be obtained that is straighter. .
When the shape of the flat wire 11 was corrected using this apparatus, both the warpage in the longitudinal direction of the wire and the meandering which was the width deformation were corrected, and the flatness could be further improved.

  In each of the above-described embodiments, the straightening roll is a horizontal roll, but may be a vertical roll. In this case, the wire is drawn from the bobbin in the vertical direction.

  FIG. 5 shows a schematic plan view of a solar cell assembling apparatus 40 incorporating the wire straightening device 10 according to the present embodiment.

  The solar cell assembling apparatus 40 includes a front clamping device 41 and a rear clamping device 42 that hold the flat wire (lead wire) 11. The front clamping device 41 is provided so as to be capable of reciprocating with respect to the rear clamping device 42. A cutting device 43 is provided between the front clamping device 41 and the rear clamping device 42. The flat wire 11 wound around the bobbin 44 in a roll shape is gripped by the front clamp device 41 and pulled out from the bobbin 44 for a predetermined length. When the flat wire 11 is pulled out, the flat wire 11 is straightened by the wire straightening device 10 provided between the bobbin 44 and the rear clamp device 42. The straightened flat wire 11 is cut to a set length by the cutting device 43. The cut lead wire 11a is adsorbed by the adsorbing device 45, supplied to the bonding position of the solar battery cell 50 conveyed to the set position on the conveying device 46, and soldered. As a result, the adjacent solar cells are electrically connected to each other via the lead wire 11a (for details of the solar cell assembling apparatus 40, see, for example, JP-A-2003-298096).

  As described above, by incorporating the wire straightening device 10 according to the present embodiment into the solar cell assembly device 40, as shown in FIG. 6, with the lead wire 11a straightened between adjacent solar cells 50, It is possible to connect to a predetermined position with high accuracy. Further, in the case of the conventional stretcher type, a tensile force is applied to the flat wire material to cause plastic deformation so that permanent strain remains, so that the proof strength of the lead wire 11a increases. On the other hand, in this embodiment, since the increase in the proof stress of the lead wire 11a based on copper can be suppressed, the warpage of the solar cell 50 made of silicon can be effectively reduced.

  Therefore, according to the solar cell assembly device 40 incorporating the wire rod straightening device 10, the adjacent solar cells 50 can be accurately and reliably connected to each other via the lead wire 11a, and the electrical reliability is improved. High solar cell module can be manufactured with high yield.

  In addition, since the wire straightening device according to the embodiment incorporated in the assembly device for solar cells is small, the assembly device for solar cells can be miniaturized.

  Preferred forms of the present invention will be additionally described.

According to this embodiment, the wire rod drawing means for drawing the wire wound in a coil shape, and a plurality of corrections provided along the wire drawing direction and staggered in the thickness direction of the wire. A groove and a groove having a groove width substantially the same as the width of the wire provided in the straightening roll, and a groove that applies bending in the thickness direction of the drawn wire and restricts deformation in the width direction. A wire straightening device provided can be provided.
When the wire is drawn out of the groove between the plurality of straightening rolls, a pressing force is applied to the wire from both sides in the wire thickness direction by the bottom surface of the groove. In addition, a pressing force is applied from both sides in the width direction of the wire by both side surfaces of the concave groove. Therefore, it is possible to effectively correct deformations such as warpage and meandering in the longitudinal direction of the wire and the width of the wire with a simple structure in which a groove is provided on the straightening roller.

The concave groove may have a groove width and a depth corresponding to the wire having a width / thickness ratio of 1 to 60.
It is preferable that the ratio of the width / thickness of the wire is 1 to 60, since the warpage in the longitudinal direction of the wire and the warp in the width direction of the wire can be more effectively corrected. If the ratio is a horizontally long wire having a cross section larger than 60, it becomes difficult to correct the deformation in the wire width direction by the straightening roll. On the other hand, if the ratio is a vertically long wire having a cross section smaller than 1, correction of deformation in the wire width direction by the straightening roll is too effective, making it difficult to set appropriate conditions. The width / thickness ratio of the wire is preferably 2 to 40, more preferably 5 to 20.

It is preferable to round or chamfer the corner portion of the groove opening where the groove side surface of the groove and the surface of the correction roll not provided with the groove intersect.
By rounding or chamfering the corners of the groove opening, it is possible to reduce the problems that the width direction side surface of the wire is scraped or that the wire runs on the correction roll (guide ring) outside the groove, and more The shape of the wire can be corrected effectively.

The grooved correction roll provided with the concave portion is a cylindrical roll in which convex locking portions or concave locked portions are provided on both end surfaces, and the side surface constitutes the bottom surface of the ring-shaped concave groove. A concave shape having a main body and a ring plane that faces each end face of the roll main body to form a side surface of the concave groove, and a locking portion or a locked portion of the roll main body is locked to the ring plane. And a pair of ring-shaped guide rings having a convex locking portion, and the locking portion of the roll main body or the locked portion, the locked portion of the guide ring or The locking portion can be removably locked.
Since the guide ring can be removed from the roll body and the length of the roll body, that is, the groove width can be changed, the roll body is replaced with a roll body that matches the size of the wire in the width direction. Thus, the wire straightening device can be freely adapted to various wire widths.

It is preferable to provide tension loading means for applying tension to the wire on the upstream side of the straightening roll in the drawing direction of the wire.
With this tension load, the wire can be pulled out stably, there is no possibility of variations in correcting deformation in the wire width direction and the wire longitudinal direction, and a wire without deformation can be obtained.

It is preferable to provide a movable roller that applies tension to the wire by its own weight on the upstream side of the straightening roll in the drawing direction of the wire.
With this tension load, the wire can be pulled out stably, there is no possibility of variations in correcting deformation in the wire width direction and the wire longitudinal direction, and a wire without deformation can be obtained.

Moreover, it is a solar cell assembling device for electrically connecting adjacent solar cells via lead wires, and provides a solar cell assembling device including the above-described wire straightening device as the lead wire straightening device. be able to.
Adjacent solar cells can be accurately and reliably connected to each other through lead wires without deformation, and a solar cell module with high electrical reliability can be manufactured with high yield.

  In addition to the solar cell assembly device, the wire straightening device of the present embodiment can also be incorporated into a wire rewinding device that rewinds various wires previously wound into a coil shape into another coil shape. .

[Examples 1 and 2 and Comparative Example 1]
In both Examples 1 and 2 and Comparative Example 1, a common flat wire having a thickness of 0.2 mm and a width of 2 mm wound around a bobbin was prepared.
In Examples 1 and 2, the flat wire is corrected using the wire straightening device 10 shown in FIG. The flat wire wound around the bobbin was pulled out and supplied to the wire straightening device 10 to correct the flat wire with a plurality of grooved horizontal rolls. Each roll diameter of the wire straightening device used for the flat wire was 80 mm (Example 1) and 30 mm (Example 2). On the other hand, Comparative Example 1 is obtained by stretching the sheet by giving 2% elongation by a conventional stretcher method.
The amount of deformation of the flat wire before and after correction was compared. The amount of deformation referred to here is the amount of deformation per 150 mm length of the flat wire. Moreover, the 0.2% yield strength before and after correction was compared. Furthermore, the curvature of the photovoltaic cell which adhered the lead wire after correction was compared. The cell used for the evaluation has a thickness of 200 μm, and Sn—Ag—Cu based lead-free solder is used as the solder for bonding the lead wire to the solar battery cell. These comparison results are shown in FIG.

  As shown in FIG. 7, the deformation amount (warpage amount) in the longitudinal direction of the straight wire after correction in each of the flat wires of Examples 1 and 2 is 1 mm and 0.8 mm, respectively, and is about 1/70 to 1/1 before the correction. It became 87. Moreover, the amount of deformation (meandering amount) in the wire width direction after correction in each flat wire of Examples 1 and 2 is 0.5 mm and 0.4 mm, respectively, and is about 1/2 to 1/25 before correction. It was. Moreover, the 0.2% yield strength after correction in the flat wire rods of Examples 1 and 2 was 53 MPa and 55 MPa, respectively, and increased by 6% and 10% before correction. Moreover, the curvature of the photovoltaic cell which adhere | attached the lead wire after correction | amendment was 4.5 mm and 5 mm, respectively.

  On the other hand, the amount of deformation (warpage) in the longitudinal direction of the flat wire of Comparative Example 1 after correction was 1 mm, which was about 1/70 before correction. Further, the amount of deformation (meandering amount) in the wire width direction after correction in the flat wire of Comparative Example 1 was 0.5 mm, which was about ½ before correction. Moreover, the 0.2% yield strength after correction in the flat wire of Comparative Example 1 was 75 MPa, which was an increase of 50% before correction. The warpage of the cell to which the flat wire (lead) after correction was bonded was 7 mm.

  From the above, it has been confirmed that by correcting the flat wire using the wire straightening device of the present embodiment, a substantially straight wire can be obtained without increasing the yield strength of the flat wire. Moreover, it has confirmed that a photovoltaic cell with few curvature was obtained by adhere | attaching a lead wire to a photovoltaic cell using the assembly apparatus of the photovoltaic cell of this Embodiment.

[Examples 3 and 4 and Comparative Examples 2 to 4]
Five types of horizontal rolls having different roll edge machining dimensions (chamfering dimensions) of part A shown in FIG. Each roll edge machining size is 0.05 mm (Example 3), 2.0 mm
(Example 4), 0.02 mm (Comparative Example 2), 2.5 mm (Comparative Example 3), and 3.0 mm (Comparative Example 4). These horizontal rolls were incorporated into the wire straightening device 10 shown in FIG.

  In both Examples 3 and 4 and Comparative Examples 2 to 4, a common flat wire having a thickness of 0.2 mm and a width of 2 mm wound around a bobbin was prepared. The flat wire wound around the bobbin was pulled out and supplied to the wire straightening device 10 shown in FIG. 1, and the flat wire was straightened by a grooved horizontal roll system. We compared the side cut of the flat wire due to the difference in the roll edge processing dimensions at that time, and the riding on the guide ring. The comparison results are shown in FIG.

  In FIG. 8, the wire side cut “Δ” means that the side cut of the wire has been found, and the wire side cut “◯” means that the side cut of the wire has not been found. In addition, “○” on the guide ring means that there was no ride, and “×” means that the ride has reached the center of the wire in the width direction. “Boarding” means that the wire rod has been found a little to the center in the width direction, but the wire rod has returned to an appropriate track by itself.

  As shown in FIG. 8, when the horizontal rolls with chamfer dimensions of 0.05 mm to 2.0 mm in Examples 3 and 4 were used, no side scraping of the wire was found, and there was no climbing on the guide ring. .

  On the other hand, when the horizontal roll of Comparative Example 2 was used, there was no climbing on the guide ring, but the side surface of the wire was scraped. In Comparative Example 3, although no side scraping of the wire was found, a slight amount of climbing to the center in the width direction of the wire was found, but the flat wire returned to an appropriate track by itself. Further, in Comparative Example 4, although no side scraping of the wire was found, there was a run up to the center in the width direction of the wire.

  From the above, it was confirmed that by performing the flat wire straightening using the wire straightening device of the present embodiment, it is possible to obtain a wire free from side shaving of the wire and to not run onto the roll processing portion.

[Example 5, Comparative Example 5]
Two types of horizontal rolls were prepared. The horizontal roll has a fitting structure (Example 5) and an integrally cut structure (Comparative Example 5). These horizontal rolls were incorporated into the wire straightening device 10 shown in FIG.

  In both Example 5 and Comparative Example 5, a common flat wire having a thickness of 0.2 mm and a width of 2 mm wound around a bobbin was prepared. The flat wire wound around the bobbin was pulled out and supplied to the wire straightening device 10 shown in FIG. 1, and the flat wire was straightened by a grooved horizontal roll system. The side surface deformation due to the difference in horizontal roll structure at that time was compared. The comparison results are shown in FIG.

  In FIG. 9, the wire side surface deformation “△” means that the height difference from the center to the side surface is 0.2 mm or more when the wire is viewed in the width direction, and the wire side surface deformation “◯” This means that almost no deformation was observed.

  As shown in FIG. 9, when the horizontal roll having the structure of Example 5 was used, the wire side surface deformation was hardly observed. On the other hand, when the horizontal roll having the structure of Comparative Example 5 was used, when the wire was viewed in the width direction, the height difference from the central portion to the side surface was 0.2 mm or more.

  From the above, it was confirmed that a wire without deformation of the wire side surface can be obtained by correcting the flat wire using the horizontal roll having the structure of the present embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the wire straightener in one embodiment of this invention, (a) is a top view, (b) is a side view. It is explanatory drawing of the roll structure with a groove | channel shown in FIG. 1, (a) is a top view, (b) is a side view, (c) is an A section enlarged view, (d) is an A section enlarged view. It is explanatory drawing of the roll structure with a groove | channel which shows the modification of FIG. 2, (a) is a top view, (b) is an exploded plan view, (c) is an exploded plan view, (d) is the B section enlarged view, e) is an enlarged view of part B. It is a side view of the wire straightener which shows the modification of FIG. It is a top view which shows schematic structure of the assembly apparatus of the solar cell in this Embodiment. It is a perspective view which shows the connection state of the lead wire for a connection to the photovoltaic cell in this Embodiment. It is a figure which shows the comparison result of the shape correction of the wire in an Example and a comparative example. It is a figure which shows the comparison result of the presence or absence of the side cut of the wire in the edge processing dimension of the grooved roll in an Example and a comparative example, and the riding on a guide ring. It is a figure which shows the comparison result of the presence or absence of a wire rod side surface deformation | transformation in the structure of the grooved roll in an Example and a comparative example. It is a figure explaining deformation | transformation of a wire, Comprising: (a) is a perspective view of the wire which has a deformation | transformation of a wire width direction, (b) is a perspective view of the wire which has a deformation | transformation of a wire rod longitudinal direction. It is a side view of the stretcher which is one of the wire rod straightening apparatuses of a prior art example. It is a side view of the roller leveler which is one of the wire rod straightening apparatuses of a prior art example. It is a figure explaining the roller leveler which distribute | arranged the vertical roll of the prior art example, Comprising: (a) is a top view, (b) is a side view. It is a top view which shows the modification of FIG.

Explanation of symbols

11 Flat wire 10 Wire straightening device 12 Horizontal roll (straightening roll)
20 groove

Claims (9)

A wire drawing means for pulling out the wire wound in a coil shape;
A plurality of correction rolls provided along the drawing direction of the wire, and alternately provided in the thickness direction of the wire,
A concave groove having a groove width substantially the same as the width of the wire provided in the straightening roll, bending the thickness direction of the drawn wire, and regulating the deformation in the width direction;
Wire straightening device equipped with.   2. The wire straightening device according to claim 1, wherein the concave groove has a groove width and a depth corresponding to the wire having a wire width / thickness ratio of 1 to 60. 3.   The wire rod straightening device according to claim 1 or 2, wherein a corner of the groove opening where the groove side surface of the groove and the surface of the straightening roll not provided with the groove intersect is rounded or chamfered.   The wire rod straightening device according to claim 3, wherein roundness of a corner of the groove opening is 0.05 mm to 2 mm.   The wire rod straightening device according to claim 3, wherein a chamfer dimension of a corner portion of the groove opening is 0.05 mm to 2 mm. A correction roll provided with the concave groove,
A cylindrical roll body having convex locking portions or concave locked portions on both end surfaces, and the side surfaces forming the bottom surface of the ring-shaped concave groove,
A concave engagement member having a ring plane that faces each end face of the roll body to form a side surface of the recessed groove, and the engagement portion or engagement portion of the roll body is engaged with the ring plane. A pair of ring-shaped guide rings having stop portions or convex locking portions;
Consisting of
The wire rod correction according to any one of claims 1 to 5, wherein the locked portion or the locked portion of the guide ring is detachably locked to the locked portion or the locked portion of the roll body. apparatus.   The wire straightening device according to any one of claims 1 to 6, further comprising tension loading means for applying a tension to the wire on the upstream side of the straightening roll in the drawing direction of the wire.   The wire straightening device according to any one of claims 1 to 6, further comprising a movable roller that applies tension to the wire by its own weight on an upstream side of the straightening roll in the drawing direction of the wire. A solar cell assembly device for electrically connecting adjacent solar cells via lead wires, comprising the wire rod straightening device according to any one of claims 1 to 8 as the lead wire straightening device. A solar cell assembling apparatus.