JP5242363B2 - Solar cell lead wire soldering equipment - Google Patents

Description

  The present invention relates to a solar cell lead wire soldering apparatus.

  In recent years, solar power generation using solar cells has been put into practical use as one of power generation methods for preventing environmental degradation. A solar cell is a device that directly converts light energy into electrical energy using an electromotive force generated by irradiating light onto a semiconductor layer formed by stacking two types of semiconductors, a P-type semiconductor and an N-type semiconductor. .

In solar cells, the main body is usually formed into a panel shape, and the power generated can be efficiently taken out by soldering the lead wire (ribbon wire, conductive wire) to one or both sides of the main body and wiring. However, when this lead wire is soldered manually, the labor is increased and it is difficult to keep the cost low. And a soldering unit for pressing the heated lead wire against the solar cell and heating to solder the lead wire to the solar cell along the wiring direction, and at least one of the wiring work of the solar cell by the lead wire A solar cell lead wire soldering apparatus shown in Patent Document 1 that automatically performs the process is known.
JP 2001-177131 A

  The lead wire soldering apparatus for solar cells in the above document moves the soldering unit along the wiring direction to perform the soldering operation of the lead wire to the solar cell. In the process of moving the soldering unit, When the heat conducted from the unit to the lead wire is sequentially transferred to the solar cell side, part of it is diffused, and the amount of heat necessary to melt the solder cannot be obtained, hindering the soldering work of the lead wire There is.

It is desirable to provide an auxiliary heating means for auxiliary heating of the lead wire in preparation for the above shortage of heat. For example, the auxiliary heating means is constituted by a hot air device for auxiliary heating of the lead wire by blowing hot air on the lead wire. In such a case, unnecessary portions are heated, and there is a problem from the viewpoint of heating the lead wire efficiently and at low cost, and there is a possibility that unexpected situations such as damage of the solar cell may occur due to heating of the unnecessary portions. There is also a problem that there is.
The present invention solves the above-mentioned problems and improves the quality of the soldering work of the lead wire to the solar cell at a low cost by heating the lead wire efficiently to ensure the amount of heat necessary for melting the solder. It is an object of the present invention to provide a solar cell lead wire soldering apparatus.

The solar cell lead wire soldering apparatus of the present invention for solving the above-described problem is, firstly, a feeding portion 13 through which a lead wire 12 used for wiring of a solar cell 9 that generates power by receiving light is fed; A soldering unit 11 for pressing the heated lead wire 12 against the solar cell 9 and heating it to solder the lead wire 12 to the solar cell 9 along the wiring direction. in automatically performed solar cell lead wire soldering apparatus at least a portion of the wiring work, provided the application circuits 32 and 33 which Ru is energized to lead 12 which is pressed against the solar cell 9, the resistance the lead 12 By using the resistance R that generates heat, an auxiliary heating means for heating the lead wire 12 in addition to the heating from the soldering unit 11 is configured .

Second, the lead 12 feeding when the lead wire 12 abuts the rotation actuated by the guide or delivery to the roller 19A of the lead 12 by, 19B Bei give a, the applying circuit 33, the roller 19A, and 19B A feature is that a voltage is applied to the soldering unit 11 .

Thirdly, when the lead wire 12 is fed out, the holding mechanism 24 is provided with rollers 19A and 19B that guide or send out the lead wire 12 by rotating in contact with the lead wire 12 and holding the fed lead wire 12. The application circuit 32 is provided downstream of the soldering unit 11 and the application circuit 32 is configured to apply a voltage between the rollers 19A and 19B and the holding mechanism 24 .

Fourth, the holding mechanism 24 includes a clamp device that holds the lead wire 12 .

Fifth, a pair of the rollers 19A and 19B is provided so as to guide or send the lead wire 12 therebetween .

Sixth, the lead wire 12 fed from the feeding portion 13 is solder-coated .

  According to the present invention configured as described above, since only the lead wire can be heated by resistance heat by energizing the lead wire, the amount of heat necessary for melting the solder is ensured efficiently and reliably. There is an effect that the quality of the soldering work can be improved at a cost.

  In addition, a roller that guides or sends out the lead wire by rotating in contact with the lead wire when the lead wire is extended is formed, and an application circuit for applying a voltage is formed between the roller and the soldering unit. If the auxiliary heating means is configured and the lead wire is energized by the application circuit, it is possible to reliably energize the lead wire by the roller and the soldering unit that are always in contact with the lead wire during the operation. There is an effect that the lead wire can be efficiently heated.

  Further, the auxiliary heating unit is configured by providing a holding mechanism for holding the drawn lead wire downstream from the soldering unit and forming an application circuit for applying a voltage between the roller and the holding mechanism. However, if the lead wire is energized by the application circuit, the lead wire can be reliably energized by the roller and the holding mechanism that are always in contact with the lead wire during the operation, so that the lead wire is heated more efficiently. There is an effect that it becomes possible.

  Furthermore, since the lead wire fed out from the feeding portion is coated with solder, there is no need to separately prepare solder during the operation, and thus there is an effect that a more efficient soldering operation can be performed.

Hereinafter, embodiments of the present invention will be described based on illustrated examples.
FIG. 1 is a schematic diagram showing the main configuration of a solar cell lead wire soldering apparatus to which the present invention is applied. A solar cell lead wire soldering apparatus 1 shown in the figure includes a base 2 and a pair of front and rear belt conveyors (conveyance) supported by the base 2 and extending in the left-right direction (direction perpendicular to the paper surface in the figure). Device) 3, a pair of front and rear support frames 4, 4 projecting upward from the base 2 and sandwiching the two belt conveyors 3, 3 at the front and rear, and two support frames 4, 4 is fixed and installed (fixed) on a fixed plate (fixed body) 6 having a rectangular shape that extends in the front-rear direction and the vertical direction and is long in the front-rear direction. And a pair of upper and lower horizontal rails 7 and 7 extending in the front-rear direction so as to be parallel to each other, and a movable plate (movable body) 8 slidably engaged with and supported by the horizontal rail 7.

  The solar cells 9 are positioned and placed on the pair of belt conveyors 3 and 3, and the left and right positions of the solar cells 9 are adjusted with respect to the movable plate 8 by driving the belt conveyors 3 and 3.

  The movable plate 8 includes a drive roller that is rotatably supported on the movable plate 8 side and abuts against the horizontal rail 7 to reciprocate the movable plate 8 in the front-rear direction along the horizontal rail 7 and the drive roller. A horizontal driving device (not shown) having a motor to be rotated and the like, a soldering unit 11 for performing a soldering operation on the solar cell 9 positioned and placed on the belt conveyor 3, and a lead coated with solder on the surface And a feeding portion 13 through which a wire (conductive wire) 12 is fed.

  The soldering unit 11 includes a vertical rail 14 that is fixed to the movable plate 8, a support member 16 that is slidably engaged with the vertical rail 14, and a support member 16 that moves vertically along the vertical rail 14. A vertical drive device (not shown) for sliding movement driving, an ultrasonic horn 17 made of a conductor attached to and supported by the support member 16, and a heater (not shown) housed in the ultrasonic horn 17 for heating the ultrasonic horn 17 ).

  The ultrasonic horn 17 to which the ultrasonic vibration is amplified and transmitted is slid downward, so that the lead wire 12 fed out from the feeding portion 13 is placed at a position (soldering position) directly below the soldering unit 11 on the upper surface of the solar cell 9. ) Press against P. At this time, the ultrasonic horn 17 that vibrates at high speed while being heated by the heater melts the solder coated on the surface of the lead wire 12 and efficiently solders the lead wire 12 to the upper surface of the solar cell. .

  The feeding portion 13 includes a bobbin 18 around which the lead wire 12 is wound, and a lead wire 12 that is rotatably supported at a position below the bobbin 18 and close to the soldering position P on the movable plate 8 and pulled out from the bobbin 18. There are provided rollers 19A and 19B made of a pair of conductors to be sandwiched, and a guide cylinder (guide body) 21 through which the lead wire 12 fed out between the pair of guide rollers 19A and 19B is inserted.

  The pair of rollers 19 </ b> A and 19 </ b> B is rotated by the abutted lead wire 12 when the lead wire 12 is fed, and functions as a guide roller for guiding the lead wire 12 to the guide tube 21 (soldering position P side). The pair of rollers 19A and 19B may be constituted by a pair of feed rollers that are driven to rotate by a motor or the like and forcibly feed the lead wire 12 sandwiched between the rollers 19A and 19B to the guide tube 21 side.

  The guide cylinder 21 is a cylindrical member that is open at both ends that extend linearly and incline downward toward the feeding side in a state in which the roller 19A, 19 vicinity reaches the soldering position P vicinity and faces the front-rear direction in plan view. The lead wires 12 from the rollers 19A and 19B are guided toward the soldering position P.

  Various devices and the like installed on the movable plate 8 as described above are electrically connected by a harness 22 to a control board (control unit) (not shown) including a microcomputer installed on the back side of the fixed plate 6 and the like. Various controls such as temperature detection, position detection, and drive control are performed by this control board.

  A clamp device (holding mechanism) 24 is attached to the downstream end (starting end) of the fixed plate 6 via a bracket 23. The clamp device 24 includes a pair of sandwiching bodies 26A and 26B made of conductors that move up and down so as to be separated from and close to each other, and the pair of sandwiching bodies 26A and 26B are brought out from the feeding unit 13 by being close to each other. While holding and fixing the lead-out downstream end portion (tip portion) 12a of the lead wire that has passed through the soldering position P and protruded from the solar cell 9, the pair of sandwiching bodies 26A and 26B are separated from each other. As a result, the holding and fixing of the distal end portion 12a of the lead wire 12 by the clamp device 24 is released.

Next, based on FIG. 2, the structure of the solar cell 9 is demonstrated easily.
FIG. 2A is an overall plan view of the solar cell, and FIG. 2B is a cross-sectional view of the main part showing the configuration of the solar cell. The solar cell 9 is a conventionally well-known square-shaped thin solar panel, and has a plurality of solar cells (power generation modules) 27 formed into a rectangular plate of the same shape. A positive electrode collector (collector electrode) 27 a is formed on the surface of each solar battery cell 27, and a negative electrode collector (collector electrode) 27 b is formed on the back surface.

  A plurality of solar cells 27 are arranged in parallel in the front-rear and left-right directions to form a lattice shape, and the positive electrode collector electrode 27 a of the one-side solar cell 27 and the other-side solar cell 27 in a pair of adjacent solar cells 27. Adjacent solar battery cells 27 are sequentially electrically connected in series by the lead wire 12 soldered to the negative electrode collector electrode 27b.

  Then, a plurality of solar cells 27 arranged in a lattice shape in a state of being electrically connected in series by the lead wires 12 are made of a single transparent (translucent) surface protective glass (on the surface side) ( A front surface protection panel (protection panel) 28 and a single back surface protection panel (protection panel) 29 located on the back surface side are sandwiched, and a transparent filler (not shown) is interposed between the pair of protection panels 28 and 29. By filling, the pair of protective panels 28, 29, the filler, and the plurality of solar cells 27 are integrated, and the solar cell 9 is assembled by assembling the frame 31 to the outer edge of the integrated rectangular member. The finished product is manufactured.

  In the above, an example of wiring the solar battery 9 by directly soldering the lead wires 12 to the front and back surfaces of the solar battery cell 27 is shown, but a conductor such as a bump electrically connected to the collector electrodes 27a and 27b. (Not shown) is led out to the outer surfaces of the protective panels 28 and 29, the lead wires 12 are soldered to the outer surfaces of the protective panels 28 and 29, and the conductors on the outer surfaces of the protective panels 28 and 29 are electrically connected to each other. The battery 9 may be wired.

  The solar cell lead wire soldering apparatus 1 is configured to perform the wiring work by soldering the lead wire 12 to the solar cell 9 in the manufacturing process.

Next, the soldering operation of the solar cell lead wire soldering apparatus 1 will be described with reference to FIG.
First, the solar cell lead wire soldering apparatus 1 holds and fixes the distal end portion 12a of the lead wire 12 fed from the feeding portion 13 by the clamp device 24 in a state where the movable plate 8 is positioned at the start end portion.

  Subsequently, after the pair of conveyors 3 and 3 are driven and the left and right positions of the solar cell 9 are adjusted so that the lead wire 12 wiring portion of the solar cell 9 is located directly below the soldering unit 11, the ultrasonic wave is adjusted. The support member 16 is driven to slide downward so that the lead wire 12 is pressed against the solar cell 9 by the horn 17.

  Subsequently, in a state where the ultrasonic horn 17 is heated by the heater and is vibrated at a high speed, the movable plate 8 is moved to the end portion (end portion) opposite to the start end of the fixed plate 6. In this process, the lead wire 12 is drawn out (drawn out) from the feeding portion 13, and is soldered to a location facing the soldering unit 11 in the solar cell 9 with the lead wire 12 facing in the front-rear direction. That is, the sliding direction of the movable plate 8 is the wiring direction of the solar cell 9.

  Subsequently, the lead wire 9 soldered to the solar cell 9 is cut from the lead wire 9 fed from the feeding portion 13 side by an arbitrary cutting means (not shown) such as a cutting blade, and the solar cell 9 The holding of the tip end portion 12a of the soldered lead wire 12 by the clamp device 24 is released, the soldering unit 11 is slid upward, and the operation of the current process is completed.

  Subsequently, the movable plate 8 is moved to the starting end, the leading end portion 12a of the lead wire 12 fed out from the feeding portion 13 is held and fixed by the clamp device 24, and the solar cell 9 is relative to the soldering unit 11 by the conveyor 3. By adjusting the right and left positions again, the process proceeds to the next step, and the above-described processing is repeated again.

  The solar cell lead wire soldering apparatus 1 having the above-described configuration has an auxiliary heating means for auxiliary heating of the lead wire 12 in preparation for the case where the amount of heat necessary for melting the solder cannot be obtained by a heater or vibration heat. This auxiliary heating means makes it possible to perform a smooth and high-quality soldering operation.

Next, the configuration of the auxiliary heating means will be described with reference to FIGS.
3A and 3B are conceptual diagrams showing examples of auxiliary heating means, respectively. The auxiliary heating means includes an AC type or DC type power supply device V that generates a potential difference between the clamp device 24 and the feeding unit 13 as shown in FIG.

  Of the two electrodes of the power supply device V, one electrode is electrically connected to both or one of the pair of rollers 19A and 19B of the feeding portion 13, and the other electrode is a pair of clamping bodies 26A and 26A of the clamp device 24. It is electrically connected to both or one of 26B. Since each roller 19A, 19B and the clamping pair 26A, 26B are made of a conductor, between the clamping location by the pair of rollers 19A, 19B and the clamping location by the pair of clamping bodies 26A, 26B in the lead wire 12. A voltage is applied and a current flows.

  That is, an application circuit 32 for energizing the lead wire 12 is formed by the power supply device V, the pair of rollers 19A and 19B, and the pair of sandwiching bodies 26A and 26B. When a current flows through the lead wire 12, the lead wire 12 becomes a resistance R that generates resistance heat, and the lead wire 12 itself generates heat. In this way, the aforementioned auxiliary heating means is configured.

  Further, the auxiliary heating means may be configured by providing an AC type or DC type power supply device V that generates a potential difference between the soldering unit 11 and the feeding unit 13 as shown in FIG. . In this case, one of the electrodes of the power supply device V is electrically connected to both or one of the pair of rollers 19A and 19B of the feeding portion 13, and the other electrode is connected to the ultrasonic horn 17. Electrically connected. Since each roller 19A, 19B and the ultrasonic horn 17 are composed of a conductor, between the location where the pair of rollers 19A, 19B are sandwiched in the lead wire 12 and the location where the ultrasonic horn 17 is pressed, A voltage is applied and current flows.

  That is, the power supply device V, the pair of rollers 19A and 19B, and the ultrasonic horn 17 form an application circuit 33 that energizes the lead wire 12. When a current flows through the lead wire 12, the lead wire 12 becomes a resistance R that generates resistance heat, and the lead wire 12 itself generates heat. In this way, the aforementioned auxiliary heating means is configured.

  The example in which the outer peripheral surface of the lead wire 12 is coated with solder has been described above. However, the lead wire 12 may be soldered using a bump or the like formed. In addition, a normal soldering iron may be used in place of the heater and the ultrasonic horn 17. Further, both of the two application circuits 32 and 33 may be provided.

Next, another embodiment of the solar cell 9 will be described with reference to FIG.
4 (A) and 4 (B) are a plan view and a cross-sectional view of main parts conceptually showing the structure of a solar cell of another embodiment. The illustrated solar cell 9 includes a back electrode layer (back electrode) 36, a semiconductor layer 37, and a surface electrode layer (surface electrode) 38 on one side of a plate-like substrate 34 having translucency such as glass. It is formed by stacking in order, and is formed into a square plate as a whole. Of the pair of electrode layers 36 and 38, at least the light irradiating side is constituted by a transparent electrode having translucency, and the light irradiated toward the solar cell 9 is transmitted through the transparent electrode to the semiconductor layer. When it reaches, power is generated.

  A plurality of bumps (terminals) 39 made of solder are formed in a row on each of the pair of long side portions 38 a and 38 b of the rectangular surface electrode layer 38 of the solar cell 9. In addition, in one long side portion 38a, three rows of grooves 9a, 9a, 9a having a depth reaching the back electrode layer 36 and extending along the long side portion 38a are formed by laser processing. Among the three rows of grooves 9a, 9a, 9a, a plurality of the bumps 39 are formed at a predetermined interval in the middle groove 9a so as to be electrically connected to the back electrode layer 36.

  Then, using the solar cell lead wire soldering apparatus 1, the plurality of bumps 39 a formed in a row on the long side portions 38 a and 38 b are sequentially melted, and the pair of long side portions 38 a and 38 b of the solar cell 9 are sequentially melted. In addition, by soldering one lead wire 12 along the long side portions 38a and 38b, the lead wires 12 are electrically connected to the corresponding electrode layers 36 and 38, respectively. As described above, a total of two lead wires, one lead wire 12 electrically connected to the back electrode layer 36 and one lead wire 12 electrically connected to the front electrode layer 38. 12, the generated power can be efficiently taken out.

  Incidentally, when the wiring of the lead wires 12 is completed, the product is completed by laminating the solar cells 9 with the pair of protective panels 28 and 29 and the transparent filler, as in the above-described example. Of the three grooves 9a, 9a and 9a, the two end-side grooves 9a and 9a electrically cut the bump 39 electrically connected to the back electrode layer 36 and the surface electrode layer 38. Is functioning for.

It is a schematic diagram which shows the principal part structure of the lead wire soldering apparatus for solar cells to which this invention is applied. (A) is a whole top view of a solar cell, (B) is principal part sectional drawing which shows the structure of a solar cell. (A), (B) is a conceptual diagram which shows an example of an auxiliary heating means, respectively. (A), (B) is the top view and principal part sectional drawing which show notionally the structure of the solar cell of another form.

9 Solar cells (thin solar panels)
11 Soldering unit 12 Lead wire (conductive wire)
13 Feeding part 19A Roller (guide roller, feed roller)
19B roller (guide roller, feed roller)
24 Clamping device (holding mechanism)
27 Solar cell (power generation module)
32, 33 Application circuit

Claims (6)

A lead portion (13) for feeding out the lead wire (12) used for wiring of the solar cell (9) that generates power by receiving light, and the lead wire (12) thus fed out are pressed against the solar cell (9). And a soldering unit (11) for soldering the lead wire (12) to the solar cell (9) along the wiring direction by heating together with at least the wiring work of the solar cell (9) by the lead wire (12). in automatically performed solar cell lead wire soldering apparatus part, leads that are pressed against the solar cell (9) (12) to the applying circuit Ru is energized (32), provided with a (33), the lead The sun which comprised the auxiliary | assistant heating means which heats this lead wire (12) aside from the heating from a soldering unit (11) by making resistance (R) to which resistance heat generate | occur | produces a wire (12). Battery lead wire soldering Apparatus. Leads (12) lead at feeding (12) abuts the lead by being rotated operated (12) guide or delivery to the roller (19A), (19B) Bei example, said application circuit (33) The lead wire soldering apparatus for solar cells according to claim 1, wherein a voltage is applied between the rollers (19A), (19B) and the soldering unit (11) . The lead wire (12) is provided with rollers (19A) and (19B) for guiding or sending out the lead wire (12) by rotating in contact with the lead wire (12) when the lead wire (12) is fed out. ) Is provided downstream of the soldering unit (11), and the application circuit (32) is provided between the rollers (19A) and (19B) and the holding mechanism (24). The solar cell lead wire soldering device according to claim 1, wherein a voltage is applied to the solar cell. The lead wire soldering device for a solar cell according to claim 3, wherein the holding mechanism (24) comprises a clamp device for holding the lead wire (12) . 5. The solar cell lead wire soldering apparatus according to claim 2, further comprising a pair of the rollers (19 </ b> A) and (19 </ b> B) so as to guide or send out the lead wire (12) . The lead wire soldering device for solar cells according to any one of claims 1 to 5, wherein the lead wire (12) fed from the feeding portion (13) is solder coated .

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