JP5455809B2 - Method and apparatus for connecting solar cell connecting member - Google Patents

Description

  The present invention relates to a method and apparatus for connecting a connection member used when electrically connecting a plurality of solar cells to electrodes of the solar cells.

  In recent years, solar cells utilizing solar energy have attracted attention and various developments have been made from the viewpoint of environmental protection. In general, a solar cell is a solar cell in which a plurality of solar cells that convert solar energy into electric energy are electrically connected by a connecting member to form a string, and the string is laminated with a transparent cover glass or a protective material. Used as a module.

This connecting member is generally called a string ribbon or an interconnector, which is made of a copper foil having a thickness of 0.1 to 0.2 mm and is formed into a ribbon shape having a width of about 1.5 mm. It is coated. Solar cells have electrodes on the light receiving surface and the back surface, respectively, and these electrodes are generally formed of silver paste. As shown in FIG. 6 (a), the connecting member 52 is connected so that the positive and negative electrodes of the adjacent solar cells 51 and 51 are electrically connected, and is connected in series as shown in FIG. 6 (b). String 53 is formed.

  Here, as a method of soldering the connection member to the solar battery cell, as described in Patent Document 1, a method of melting the solder by pressing a heated metal from above the connection member, described in Patent Document 2 A method in which hot air is blown from above the connecting member to melt the solder, as described in Patent Document 3, a method in which the solder is melted by using a combination of heat radiation and hot air by an infrared lamp, and Recently, a method of melting solder by irradiating a connection member with laser light is known.

JP 2003-298095 A (page 3, FIG. 2) Japanese Patent Laying-Open No. 2006-332264 (page 7, FIG. 3) Japanese Patent Laying-Open No. 2004-253475 (page 7, FIG. 10)

  However, in the heated metal, the predetermined range (relatively wide range) must be contacted with a strong pressing force so that heat conduction is uniformly performed from the heated metal to the connection member with respect to the predetermined range. In addition, since heat is conducted from the heated metal to the connecting member in contact therewith, and further, heat must be conducted to the solder layer interposed between the connecting member and the solar cell electrode, the heating time (contact time) ) Must be lengthened. Therefore, heat spreads also around the electrode of the solar battery cell, and the occurrence of cracks due to the bias of external force and the temperature of the solar battery cell is a problem.

  In addition, the method by the emission of heat and the blowing of hot air also heats the region other than the electrode of the solar battery cell, so that it has the problem of crack generation as described above, and due to the deterioration of the characteristics of the solar battery cell itself, There is also a problem that the conversion efficiency is lowered. Further, in the method of irradiating the connection member with laser light, if there is uneven reflectance on the surface (laser light irradiation surface) of the connection member, uneven absorption of the laser light energy is caused, and heating is uniform. There is a problem of not being done. This problem becomes apparent especially when the connecting member is coated with solder.

In addition, the above heating method except the heating method using laser light simultaneously heats the portion to be connected of the connection member, so that the entire connection member having a larger thermal expansion coefficient than that of the solar battery cell is heated and expanded. Then, after the solder is solidified, it returns to room temperature while shrinking, so that stress is generated between the solar battery cell and the connection member, and remains. As a result, warpage in the direction in which the connecting member is inward is generated, and in the process after the solar battery string is formed, for example, in the stacking process for forming the solar battery module, the solar battery cell is cracked or cracked.

  Further, the inventor of the present invention has come up with a connection method shown in FIG. 7 in addition to the method described above. In this method, as shown in FIG. 7A, a pair of roller electrodes 54 and 54 are brought into contact with a connection member 52 placed on the surface electrode of the solar battery cell 51, and the connection member 52 is connected to the solar battery. Press in the direction of the cell 51 with a predetermined pressing force. Then, by moving the connecting member 52 in the direction of the arrow A together with the solar battery cell 51, the pair of roller electrodes 54 and 54 rotate in the direction of the arrow A, and roll on the connecting member 52 in the longitudinal direction. Further, by supplying power to the pair of roller electrodes 54 and 54 from a power source (not shown) during this rolling contact, the pair of roller electrodes 54 and 54 is energized through the connection member 52.

  This will be further described with reference to FIGS. 7B and 7C. FIG. 7 (b) depicts the state seen from the direction of the arrow C marked in FIG. 7 (a). FIG. 7 (c) is an enlarged view of the portion indicated by reference numeral d in FIG. 7 (b). The pair of roller electrodes 54 and 54 are in contact with each other with a gap in the width direction of the upper surface of the connection member 52, and the respective rotation axes are provided in a straight line. As shown by F, the inside of the connecting member 52 flows in the width direction, and is heated by resistance heating due to Joule heat generated in the connecting member 52 itself, thereby melting the solder of the adjacent solder layer.

  However, this method also has a problem that it takes time for the connection process because the region to be connected of the connection member 52 is connected by moving a heating spot having a small area. Also, since the width of the connecting member 52 is generally about 1.2 mm to 1.5 mm, a pair of roller electrodes 54 and 54 are arranged with a gap in the width direction so as not to fall off the connecting member 52. The rolling contact in the longitudinal direction has a problem that high accuracy of the apparatus is required and the cost is increased.

Therefore, in order to solve these problems, the present invention does not excessively heat regions other than the electrodes of the solar battery cell, shortens the time of the connection process, and does not require extremely high accuracy in the bonding apparatus. Both can be realized to improve connection quality and reduce manufacturing costs.

The present invention, as a first aspect, is a method of connecting a connecting member to an electrode of a solar battery cell when electrically connecting a plurality of solar battery cells, and is formed in an elongated ribbon shape on the electrode of the solar battery cell The step of aligning and placing the connecting member, and the contact portion of each roller of the pair of roller electrodes are brought into contact with two places separated in the longitudinal direction of the one connecting member to thereby form the electrode of the solar battery cell A step of pressing the pair of roller electrodes to the connection member while maintaining a distance between the two contact points, and at least the pair of the pair of rollers via the connection member during the rolling contact. There is provided a method of connecting a solar cell connecting member, comprising the step of energizing between the roller electrodes.

As a result, soldering is performed by heating the connection member itself, so that no adverse effect is exerted on the heating unnecessary region in the solar battery cell. Moreover, since this part is heated by supplying an electric current to the longitudinal direction of a connection member, the distance which moves a heating part in one connection process can be shortened, and, thereby, the time of a connection process can be shortened. it can.

As the present invention a second aspect, the two spacing of the contact points of the locations greater than the sum of the radii of the contact portion between the connecting portion of each of the roller material in the pair of rollers electrodes, the connection of one The solar cell connecting member connection method according to the first aspect, characterized in that it is shorter than one half of the total length of the rolling contact area where the pair of roller electrodes in the member rolls.

As a result, the pair of roller electrodes do not overlap with each other in the width direction of the connection member, and it is not necessary to significantly increase the positioning system of the connection device. In addition, by making the interval between the two contact points shorter than one half of the total length of the rolling contact region, the longitudinal center of the rolling contact region can be constantly heated from the start to the stop of energization. Therefore, it is possible to prevent only the central portion from excessively raising the temperature. Further, since the roller electrode always comes into rolling contact with the central portion while applying a predetermined pressing force, the joining quality is stabilized.

Moreover, this invention provides the connection method of the connection member for solar cells as a 3rd aspect, The said electricity supply is performed intermittently as described in any one of the 1st or 2nd aspect.

As a result, it is possible to control heating by instantaneous energization and heating pause time, and it becomes possible to control the influence of heat to the outside more precisely while maintaining connection quality.

According to a fourth aspect of the present invention, the energization is started after the rolling contact of the pair of roller electrodes with respect to the connecting member is started, and the energization is stopped before the rolling contact is stopped. The connection method of the connection member for solar cells as described in any one of the 1st thru | or 3rd aspect to perform is provided.

As a result, when heating by energization is performed, the pair of roller electrodes can always be in rolling contact with the connection member, so that the surface of the connection member that contacts the roller electrode is coated with solder. Even if it does, a roller electrode and a connection member do not adhere. Therefore, when soldering is completed and the roller electrode is retracted from the connection member, there is no problem that the connection member is peeled off from the electrode of the solar cell. However, the start and stop of energization in this case does not mean the start and stop of intermittent energization described as the third aspect, but the start of energization in the connection process of one connecting member. And stop.

Moreover, this invention provides the connection method of the connection member for solar cells as described in any one of the 1st thru | or 4th aspect characterized by switching the polarity of this electric current as said 5th aspect during the said electricity supply.

As a result, the polarity effect due to the direction of the current (the difference in the heat generation of the connecting members in the vicinity of both electrodes) can be reduced, so that the connection reliability is further improved.

Moreover, this invention is a connection apparatus which connects a connection member to the electrode of a photovoltaic cell, when electrically connecting a several photovoltaic cell as a 6th aspect, Comprising: The said connection member is mounted on an electrode. In addition, a mounting surface on which the solar cells are aligned and mounted, a pair of roller electrodes provided so as to be close to and separated from the connection member, and a predetermined pressing force for the pair of roller electrodes to the connection member A pressing means for contacting with each other, a drive unit for changing a relative position between the pair of roller electrodes and the connecting member in a rolling direction of the roller electrodes, and a power source for applying a voltage to the pair of roller electrodes The rotation axes of the pair of roller electrodes are substantially parallel to each other, and the contact portion of each of the pair of roller electrodes with the connecting member has a gap in the direction of rolling of the roller electrodes. It is provided side by side It provides a connection device for connecting members for solar cell, wherein.

Thereby, the connection of the electrode of a photovoltaic cell and a connection member and high quality connection in a short time is realizable.

According to a seventh aspect of the present invention, there is provided the solar cell connection according to the sixth aspect, wherein the pressing means is provided independently for each of the pair of roller electrodes. A member connection device is provided.

As a result, even if there is a slight unevenness on the surface of the connecting member that contacts the pair of roller electrodes, both electrodes move independently to follow this unevenness, so a uniform pressing force is applied to the connecting member. Can be maintained.

Furthermore, the present invention provides, as an eighth aspect, the solar cell connection member connecting device according to any one of the sixth and seventh aspects, wherein the material of the pair of roller electrodes is tungsten. .

By using tungsten, which is a material that repels solder with poor solder wettability, as a material for the roller electrode, the possibility of adhesion between the connection member and the roller electrode is further reduced, and the yield of the connection process is improved.

As described above, the conventional heating method is a method of applying heat to the connection member from the outside of the connection member. However, according to the present invention, the connection member itself can generate heat by electric means. Therefore, it is possible to reduce the heating that is not necessary for the connection between the electrode of the solar battery and the connection member, and to reduce the adverse effect of the heat on the solar battery cell. Further, the contact portion between the pair of roller electrodes and the connection member is provided with a gap in the longitudinal direction of the connection member, and the length of the gap in the longitudinal direction is moved in the longitudinal direction as the length of the heating portion. The distance of rolling contact is short in one connection process, and the time required for the connection process itself can be shortened.

Perspective view of the connecting member of an embodiment of the present invention The principal part perspective view which shows embodiment of this invention Shown to partial side view of an embodiment of the present invention The perspective view which shows embodiment of this invention Partial sectional view showing an embodiment of the present invention Side view and perspective view showing conventional technology Perspective view and side view showing conventional technology

Next, embodiments of a connecting method and connecting device for a solar cell connecting member according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view illustrating the light receiving surface of the solar battery cell 51 as desired. As shown in FIG. 1A, the light receiving surface is provided with a collector electrode 51B obtained by firing a silver paste and a surface electrode 51A, and is aligned with the surface electrode 51A and is elongated. A ribbon-shaped connection member 52 is placed. FIG. 1B shows a state in which the connection member 52 is placed on the surface electrode 51A, and a portion (reference character) where one end of the connection member 52 protrudes from the solar battery cell 51 is adjacent to the unillustrated portion. Connected to the back electrode of the solar cell. Here, in order to perform accurate alignment between the surface electrode 51A and the connection member 52, in recent years, the current collection electrode 51B is image-recognized and alignment is performed.

When the connecting member 52 is thus positioned and placed on the surface electrode 51A, which is an electrode of the solar battery cell 51, the pair of roller electrodes 1 and 1 are connected to each other as shown in FIG. Then, the connection member 52 is pressed toward the surface electrode 51A with a predetermined pressing force. Here, the contact points of the pair of roller electrodes 1, 1 are two places spaced apart in the longitudinal direction on one connecting member 52. In the description of the present embodiment, the connection process of one of the two connection members 52 is illustrated and described. Thereafter, as shown in FIG. 2B, the placement surface (not shown) on which the solar cells 51 are placed is moved in the direction of the arrow in a state where the connection member 52 is pressed with a predetermined pressing force.

By doing so, the pair of roller electrodes 1 and 1 rolls in contact with the longitudinal direction of the connection member 52 while rotating in the direction of the arrow. Then, after the rolling contact is started, a current is supplied from a power source (not shown) between the electrodes of the pair of roller electrodes 1 and 1. A welding power source is used as the power source in this case, but a power source capable of supplying a large current instantaneously and capable of fine output current adjustment is preferable, and a power source of a polarity switching system is still more preferable. In this embodiment, electricity is intermittently supplied every few milliseconds, and the polarity of the current is alternately switched.

FIG. 3A is a diagram showing a state in which the pair of roller electrodes 1 and 1 are in rolling contact with the connection member 52 from the direction of the arrow C marked in FIG. In FIG. 3A, a solder layer 55 is interposed between the surface electrode 51 </ b> A of the solar battery cell 51 and the connection member 52, and the pair of roller electrodes 1 and 1 are in contact with the connection member 52. Here, when the connecting member 52 moves together with the solar battery cell 51 in the direction of the arrow mark, the pair of roller electrodes 1 and 1 rotate in the direction of the arrow mark while maintaining the distance between the two contact points (reference numerals). While doing so, the connection member 52 is rolled in the left direction as seen in the figure.

After the rolling contact is started, a voltage is applied from a power source (not shown) to the pair of roller electrodes 1, 1, and energization is started from one of the pair of roller electrodes 1, 1 to the other through the connection member 52. At this time, a part of the current flows through the solder layer 55 and the surface electrode 51A. However, since the connection member 52 is made of copper having a small electric resistance and is the shortest distance, most of the current flows to the connection member 52. Resistance heat is generated in the connecting member 52. Then, the rolling contact is continued until the pair of roller electrodes reach the positions 1 ′ and 1 ′ shown by the one-dot chain line in FIG. At this time, the energization is stopped before the rolling contact is stopped, thereby preventing the pair of roller electrodes 1 and 1 from adhering to the connection member 52.

In the present embodiment, the distance between the two contact points (reference symbol) is longer than the sum of the radii of the contact portions of the pair of roller electrodes 1 and 1, and shorter than half of the total length of the rolling contact region. The length is set. As a result, the roller electrode is always in rolling contact with the center of the entire length of the rolling contact area indicated by the arrows, and a stable connection quality can be obtained by applying a predetermined pressing force over the entire length of the rolling contact area. In this case, if the distance between the two contact points (symbol S) is set longer, the distance of the rolling contact can be shortened accordingly, so that the time required for the connection process can be shortened. If it is set to be shorter than 1 / minute, overheating near the center (arrow) in the entire length of the rolling contact region can be prevented, and a pressing force can be applied to the entire connection region. Whether priority is given to shortening the required time or stability of connection quality is a selective matter, but in the present embodiment, the latter is selected.

FIGS. 3B and 3C are views showing a state in which the pair of roller electrodes 1 and 1 are in rolling contact with the connection member 52 from the direction of the arrow marked in FIG. In FIG. 3B, the connecting member 52 is placed on the surface electrode 51 </ b> A of the solar battery cell 51 through the solder layer 55. In the present embodiment, the width of the connecting member 52 is 1.2 mm, and the width of the contact portion 1A of the pair of roller electrodes 1 and 1 is 0.4 mm (in the drawing, the contact portion 1A has a sign only for the front roller electrode. Attached). In this way, by making the contact portion 1A of the roller electrode 1 smaller than the width of the connecting member, the area of the pressing point that moves at the time of rolling contact is reduced, and the pressing force can be reduced accordingly, so that the sun The influence of external force applied to the battery cell 51 can be reduced.

On the other hand, if the width of the contact portion 1A of the roller electrode 1 is larger than the width of the connection member 52 as shown in FIG. The poor positioning accuracy in the width direction with the contact portion 1A due to the bending in the width direction of the member 52 can be absorbed. However, since the contact surface is large in the width direction, it is difficult to think that the pressing force must be increased, and microscopically the entire width direction always contacts, so the current flow path varies in the width direction during rolling ( Move) and may reduce connection quality. Therefore, also in this aspect, whether to place importance on the magnitude of the allowable value of positioning accuracy or on high connection quality is a selective matter.

Next, based on FIG. 4 and FIG. 5, the connecting device for a solar cell connecting member according to the present invention will be described in detail. FIG. 4 is a schematic diagram showing the overall configuration of the connection device used in the present embodiment. Here, only the structure necessary for connecting one of the two connecting members 52 is shown, and the description will proceed. In FIG. 4, reference numeral 2 is a connection device, and 3 is a power source. Reference numeral 4 denotes a gate-type arm erected from a base (not shown), 5 denotes an elevating part held by the gate-type arm 4 so as to be movable up and down, and 6 and 6 are movable up and down independently of the elevating part 5, respectively. A pair of held electrode holders, 7 and 7 are weights for adjusting the pressing force applied to the connecting member 52 by the pair of roller electrodes 1 and 1, and 8 and 8 are fixed to the lower ends of the electrode holders 6 and 6, respectively. A pair of insulating blocks, 9 and 9 are power feeding blocks fixed to the lower surfaces of the insulating blocks 8 and 8, respectively, and 1 and 1 are a pair of roller electrodes rotatably held by the power feeding blocks 9 and 9, respectively.

The roller electrodes 1 and 1 held by the power supply blocks 9 and 9 move up and down integrally with the electrode holders 6 and 6 while being electrically insulated from the electrode holders 6 and 6 through the insulating blocks 8 and 8. It is. The elevating unit 5 can be moved up and down with respect to the gate-type arm 4 by driving the first actuator 5 </ b> A, and the pair of roller electrodes 1 and 1 are moved toward or away from the connection member 52 by moving up and down. As described above, the connection member 52 is positioned and placed on the surface electrode 51 </ b> A of the solar battery cell 51, and the solar battery cell 51 is placed and placed on the transport belt 10. The conveyor belt 10 is intermittently moved in the direction of the arrow by the driving of the second actuator 10A which is a driving unit. Here, the moving direction of the arrow mark coincides with the longitudinal direction of the connecting member 52 and the rolling direction of the roller electrodes 1, 1.

Next, a rotatable holding structure for the pair of roller electrodes 1 and 1 will be described with reference to FIG. FIG. 5 is a view of the power feeding blocks 9 and 9 and the roller electrodes 1 and 1 rotatably held by the power feeding blocks 9 and 9 in FIG. 4 from above, and other components in FIG. 4 are omitted. Here, the power feeding blocks 9 and 9 are fixed to the bottom surfaces of the insulating blocks 8 and 8 in FIG. Further, the rotation axes of the pair of roller electrodes 1 and 1 are parallel to each other, and the contact portions 1A and 1A of the pair of roller electrodes 1 and 1 are in rotation direction, in other words, rolling contact. Are arranged with a gap in the direction of.

In FIG. 5, the pair of roller electrodes 1, 1 is fixed to one end of the conductive shafts 11, 11, and the conductive shafts 11, 11 are inserted into through holes provided in the power feeding blocks 9, 9. In addition, conductive grease is filled between the inner surface of the through hole and the conductive shafts 11 and 11 and is held rotatably while ensuring the conductivity of both. Here, the small diameter portion 11A of the conductive shafts 11 and 11 serves as a grease reservoir for conductive grease. 4 is connected to the power supply blocks 9 and 9, when energized, a voltage is applied between the roller electrodes 1 and 1 via the conductive shafts 11 and 11.

Next, the operation of the connection device 2 shown in FIG. 4 will be described. After the solar cells are aligned and placed on the conveyor belt 10, a control unit (not shown) starts operation. The controller moves the conveyor belt 10 in the direction of the arrow and positions it at a predetermined position, that is, a position where the rolling contact start position on the connecting member 52 is directly below the pair of roller electrodes 1, 1. Next, by lowering the elevating part 5, the pair of roller electrodes 1, 1 are also lowered, and the contact part 1 </ b> A of the roller electrodes 1, 1 comes into contact with the upper surface of the connection member 52. Thereafter, the elevating part 5 continues to descend, but the electrode holders 6 and 6 integrated with the roller electrodes 1 and 1 stop descending.

As a result, the relative position between the elevating part 5 and the electrode holders 6 and 6 changes in the vertical direction, and the roller electrodes 1 and 1 are connected to each other by a predetermined pressing force, that is, the pressing force adjusted by the weights 7 and 7. 52 is pressed. Here, since the electrode holders 6 and 6 are configured to freely move up and down independently with respect to the elevating unit 5, the vertical positions of the two electrode holders 1 and 1 contact each other. Even when there is a difference, an equal pressing force is applied to these two locations. Further, in the state in which the roller electrodes 1 and 1 are in rolling contact with the connection member 52, even if there are some irregularities on the surface of the connection member 52, the irregularities are absorbed by the independent vertical movement of the electrode holders 6 and 6, respectively. The predetermined pressing force can be maintained. Here, the structure including the electrode holders 6 and 6 and the weights 7 and 7 and moving up and down integrally with the pair of roller electrodes and applying a predetermined pressing force to the connecting member 52 can be referred to as pressing means.

Next, the control unit controls the movement of the conveyor belt 10 and the output current of the power source 3. First, the conveyor belt 10 is moved in the direction of the arrow at a predetermined speed, and then a current is output from the power source 3. Although the details of the current have been described above, they are omitted here, but the pair of roller electrodes 1 and 1 are energized while rolling on the connecting member 52 in the longitudinal direction, and the power is supplied from the power source 3 slightly before the end of the rolling contact. Stop. When the pair of roller electrodes rolls to the rolling contact end point in a state where the energization is stopped, the control unit stops the movement of the conveyance belt 10. At this time, since the pair of roller electrodes 1 and 1 are in rolling contact with each other while energization is performed, the upper surface of the connection member 52 and the roller electrode do not adhere to each other, and thereafter the pair of roller electrodes 1 , 1 is raised and retracted from the connection member 52, the connection member 52 is not peeled off from the solar battery cell 51. Furthermore, by making the material of the pair of roller electrodes 1 and 1 tungsten, it becomes difficult for the solder to get wet, and the possibility of adhesion between the roller electrode 1 and the connection member 52 decreases.

In the description of the present embodiment, in order to change the relative positions of the pair of roller electrodes 1 and 1 and the connection member 52, the transport belt 10 that is a mounting surface on which the solar cells 51 are mounted is moved. However, the pair of roller electrodes 1, 1 may be moved in the longitudinal direction of the connection member 52. In the present embodiment, the predetermined pressing force is applied to the connection member 52 by the pressing means using the action of gravity, but the elastic force of an elastic body such as a spring may be used. Needless to say.

DESCRIPTION OF SYMBOLS 1 Roller electrode 2 Connection apparatus 3 Power supply 4 Gate arm 5 Lifting part 5A 1st actuator 6 Electrode holder 7 Weight 8 Insulation block 9 Feeding block 10 Conveying belt 10A 2nd actuator 11 Conductive shaft 12 Feeding cable 51 Solar cell 51A Surface electrode 52 Connection member 55 Solder layer

Claims (8)

When electrically connecting a plurality of solar cells, a method of connecting a connection member to the electrodes of the solar cells,
A step of aligning and placing the elongated ribbon-shaped connection member on the electrode of the solar battery cell;
A step of bringing the contact portions of each roller of the pair of roller electrodes into contact with two places spaced apart in the longitudinal direction of one of the connecting members and pressing in the direction of the electrode of the solar battery cell;
Rolling the pair of roller electrodes to the connecting member while maintaining the distance between the two contact points;
Energizing between the pair of roller electrodes via the connecting member at least during the rolling,
The connection method of the connection member for solar cells characterized by having. The 2 spacing of the contact points of the locations greater than the sum of the radii of the contact portion between the connecting member of each roller in said pair of rollers electrodes, contact the pair of rollers electrodes in one said connecting member of rolling 2. The length of the rolling contact region is shorter than one half of the total length.
The connection method of the solar cell connection member of description. The method of connecting solar cell connecting members according to claim 1, wherein the energization is performed intermittently. 4. The energization is started after the rolling contact of the pair of roller electrodes with respect to the connecting member is started, and the energization is stopped before the rolling contact is stopped. The connection method of the connection member for solar cells of description. The method for connecting solar cell connection members according to claim 1, wherein the polarity of the current is switched during the energization. When electrically connecting a plurality of solar cells, a connection device for connecting a connection member to the electrodes of the solar cells,
A mounting surface for positioning and mounting the solar cell on which the connection member is mounted on an electrode;
A pair of roller electrodes provided so as to be close to and away from the connection member;
Pressing means for bringing the pair of roller electrodes into contact with the connecting member with a predetermined pressing force;
A drive unit that changes the relative position of the pair of roller electrodes and the connecting member in the direction of rolling contact of the roller electrodes;
A power source for applying a voltage to the pair of roller electrodes,
The rotation axes of each of the pair of roller electrodes are substantially parallel to each other,
The connecting device for a connecting member for a solar cell, wherein a contact portion of each of the pair of roller electrodes with the connecting member is provided side by side with a gap in the rolling direction of the roller electrodes. The said pressing means is provided independently with respect to each electrode of a pair of said roller electrode, The connection apparatus of the connection member for solar cells of Claim 6 characterized by the above-mentioned. The connecting device for a solar cell connecting member according to claim 6, wherein a material of the pair of roller electrodes is tungsten.

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