JP2016006819A - Manufacturing method of solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a solar cell module capable of implementing a satisfactory connection by preventing a solar cell from being cracked when connecting the solar cell and a tab line.SOLUTION: In accordance with the manufacturing method of the solar cell module, when a pressure from a pressing member 21 is applied to a tab line 3, an adhesive film 15 is pressed by a rugged surface formed from finger electrodes 12 which are arrayed on a light-receiving plane 2a. Therefore, even if the pressing is performed uniformly and with a low pressure equal to or lower than 1.0 MPa by the pressing member 21 that is wider than a line width of the tab line 3, removability of a resin of the adhesive film 15 can be sufficiently secured during compression and while preventing a solar cell 2 from being cracked, the satisfactory connection can be implemented. Further, in the method, the pressing member 21 is disposed in a hot air supply nozzle 22 which supplies hot air. Therefore, the pressing member 21 can be uniformly heated by the hot air supply nozzle 22, such that the adhesive film 15 can be appropriately cured.

Description

  The present invention relates to a method for manufacturing a solar cell module.

  The solar cell module is a device that directly converts light energy into electric energy, and thus attracts attention as clean energy, and the market is expected to expand rapidly in the future. Such a solar cell module generally has a structure in which a plurality of solar cells are connected in series according to a required voltage value.

  More specifically, in the solar cell module, the surface electrode formed on the light receiving surface side of the solar cell and the back electrode formed on the back surface side of the adjacent solar cell are formed by wiring members such as tab wires. Electrically connected. Conventionally, the connection between these electrodes and the tab wire has been excellent in connection reliability such as continuity and fixing strength, and is inexpensive and highly versatile. Therefore, connection by solder has been used (see, for example, Patent Document 1). .

JP 2005-236235 A

  In recent years, from the viewpoint of environmental protection and the like, a method for connecting electrodes of solar cells and tab wires using, for example, a film-like adhesive without using solder has been studied. In the connection method using an adhesive film, connection at a low temperature is possible as compared with connection by solder. For this reason, the crack and curvature of a photovoltaic cell resulting from the high temperature in the case of a connection, the volume shrinkage | contraction of a solder, etc. can be suppressed.

  On the other hand, in the connection method using the conventional adhesive film, the solar cell in which the tab wire is arranged via the adhesive film is thermocompression bonded with a pressure head or the like at a pressure of about 2.0 MPa. ing. In such a conventional method, there is a possibility that the solar cell is cracked by the shearing force at the time of pressure bonding. Examples of a method of connecting the solar battery cell and the tab wire at a low pressure include a method of improving the fluidity of the adhesive and enhancing the resin exclusion property at the time of pressure bonding. However, in this method, the tackiness of the surface of the adhesive film becomes excessive, and blocking (a phenomenon in which the adhesive is transferred to the back surface of the base material) may occur in a state where the adhesive film is wound in a roll shape.

  The present invention has been made to solve the above-described problems, and provides a method for manufacturing a solar cell module that can prevent cracking of the solar cell when connecting the solar cell and the tab wire, and can realize a good connection. The purpose is to do.

  In order to solve the above problems, a method for manufacturing a solar cell module according to the present invention is a method for manufacturing a solar cell module in which finger electrodes arranged on a light receiving surface of a solar cell and a tab wire are connected using an adhesive film. The bus bar electrode connecting the finger electrodes is not provided on the light receiving surface of the solar battery cell, and the tab wire is arranged via the adhesive film in the tab wire arrangement region on the finger electrode. A pressurizing member having a width wider than the line width of the tab wire is arranged in the hot air supply part for supplying hot air, and the hot air is supplied by the hot air supply part, while the pressure member is set to 1.0 MPa or less in the tab wire arrangement region. The tab wire is thermocompression-bonded by applying a pressure of

  In this solar cell module manufacturing method, tab wires are directly connected to finger electrodes through an adhesive film in so-called bus bar electrode-less solar cells. In this method, when the pressure from the pressure member is applied to the tab wire, the adhesive film is pressed against the uneven surface formed by the finger electrodes arranged on the light receiving surface. Therefore, even when pressing is performed with a pressure member having a width wider than the line width of the tab wire at a low pressure of 1.0 MPa or less, sufficient exclusion of the resin during the pressing can be ensured, and the solar cell is cracked. It is possible to realize a good connection while preventing the above. Moreover, in this solar cell module manufacturing method, the pressurizing member is disposed in the hot air supply section for supplying hot air. For this reason, since a pressurizing member can be heated uniformly by a hot air supply part, hardening of an adhesive film can be implemented suitably.

  The method for manufacturing a solar cell module according to the present invention is a method for manufacturing a solar cell module in which finger electrodes arranged on a light receiving surface of a solar cell and a tab wire are connected using an adhesive film. On the light receiving surface of the battery cell, a bus bar electrode connecting the finger electrodes is provided with a width narrower than the width of the adhesive film, and the tab wire is disposed in the tab line arrangement region on the bus bar electrode via the adhesive film. The pressure member having a width wider than the line width of the tab wire is arranged in the hot air supply part for supplying hot air, and the hot air is supplied by the hot air supply part, while the pressure member is used to arrange the tab wire in the region where the tab line is arranged. It is characterized in that a tab wire is thermocompression bonded by applying a pressure of 1.0 MPa or less.

  In this solar cell module manufacturing method, in a solar battery cell having a bus bar electrode with a width smaller than the width of the adhesive film, the tab wire is connected to the bus bar electrode via the adhesive film. In this method, when the pressure from the pressure member is applied to the tab wire, the adhesive film is locally pressed by the bus bar electrode having a narrower width than the adhesive film. Therefore, even when pressing is performed with a pressure member having a width wider than the line width of the tab wire at a low pressure of 1.0 MPa or less, sufficient exclusion of the resin during the pressing can be ensured, and the solar cell is cracked. It is possible to realize a good connection while preventing the above. Moreover, in this solar cell module manufacturing method, the pressurizing member is disposed in the hot air supply section for supplying hot air. For this reason, since a pressurizing member can be heated uniformly by a hot air supply part, hardening of an adhesive film can be implemented suitably.

  The method for manufacturing a solar cell module according to the present invention is a method for manufacturing a solar cell module in which finger electrodes arranged on a light receiving surface of a solar cell and a tab wire are connected using an adhesive film. On the light receiving surface of the battery cell, a bus bar electrode connecting the finger electrodes is provided only on the end side of the light receiving surface with a width narrower than the width of the adhesive film, and on the finger electrode located on the center side of the light receiving surface. Place the tab wire through the adhesive film so that at least part of it overlaps the bus bar electrode in the tab wire placement area, and pressurize the hot air supply section that supplies hot air with a width wider than the tab wire width While the members are arranged and hot air is supplied by the hot air supply unit, the pressure wire applies a pressure of 1.0 MPa or less to the tab wire arrangement region, and the tab wires are thermocompression-bonded.

  In this solar cell module manufacturing method, the tab wire is directly connected to the finger electrode through the adhesive film. In this method, when the pressure from the pressure member is applied to the tab wire, the adhesive film is pressed against the uneven surface formed by the finger electrodes arranged on the light receiving surface. Therefore, even when pressing is performed with a pressure member having a width wider than the line width of the tab wire at a low pressure of 1.0 MPa or less, sufficient exclusion of the resin during the pressing can be ensured, and the solar cell is cracked. It is possible to realize a good connection while preventing the above. Moreover, in this solar cell module manufacturing method, the pressurizing member is disposed in the hot air supply section for supplying hot air. For this reason, since a pressurizing member can be heated uniformly by a hot air supply part, hardening of an adhesive film can be implemented suitably. Furthermore, in this method for manufacturing a solar cell module, the bus bar electrode connecting the finger electrodes is provided only on the end side of the light receiving surface with a width narrower than the width of the adhesive film. Thereby, a bus-bar electrode can be utilized as an alignment mark at the time of arranging a tab line. Moreover, since current can be collected from the finger electrode at the end of the light receiving surface by the bus bar electrode, it is also possible to avoid a decrease in the current collection efficiency of the solar cell module.

  Moreover, it is preferable to arrange the tab line so as to straddle all the finger electrodes on the light receiving surface. If it carries out like this, the current collection from all the finger electrodes will be attained, and the current collection efficiency of a solar cell module can fully be ensured.

  It is preferable that the thickness of the finger electrode is 10 μm to 30 μm and the width is 5 μm to 90 μm. When the thickness and width of the finger electrode satisfy this range, the uneven surface formed by the finger electrode is sufficiently formed. Therefore, it is possible to further sufficiently secure the resin exclusion during the pressure bonding.

  Moreover, it is preferable that ratio of the thickness of a finger electrode and the thickness of an adhesive film is the range of 1: 5-6: 5. In this range, the resin surface can be more sufficiently excluded from the pressing due to the uneven surface formed by the finger electrodes.

  Moreover, it is preferable that the width | variety of a bus-bar electrode is 90 micrometers or less. In this way, by reducing the width of the bus bar electrode, the adhesive film is pressed more locally by the bus bar electrode, so that it is possible to sufficiently more sufficiently exclude the resin during the press bonding.

  Moreover, it is preferable that the thickness of a bus-bar electrode is 10 micrometers-30 micrometers, and a width | variety is 5 micrometers-90 micrometers. In this case, since the adhesive film is pressed more locally by the bus bar electrode, it is possible to further sufficiently ensure the resin elimination during the press bonding.

  Moreover, it is preferable to apply a pressure of 0.5 MPa or less to the tab wire arrangement region to thermocompression-bond the tab wire. By further reducing the pressure applied to the tab wire arrangement region, it is possible to more reliably prevent the solar cell from cracking.

  Moreover, it is preferable to use a conductive adhesive film or an insulating adhesive film as the adhesive film. Thereby, the connection of the tab line can be satisfactorily realized.

  According to the method for manufacturing a solar cell module according to the present invention, it is possible to prevent cracking of the solar cell when connecting the solar cell and the tab wire, and to realize a good connection.

It is a schematic perspective view which shows the solar cell module manufactured using the manufacturing method of the solar cell module which concerns on 1st Embodiment of this invention. It is the schematic plan view which looked at the photovoltaic cell which comprises the solar cell module of FIG. 1 from the light-receiving surface side. It is the schematic plan view which looked at the photovoltaic cell of FIG. 2 from the back surface side. It is a schematic sectional drawing which shows the mode of a connection with a photovoltaic cell and a tab wire. It is the schematic plan view which looked at the photovoltaic cell with which the manufacturing method of the photovoltaic module concerning 2nd Embodiment of this invention is applied from the light-receiving surface side. It is a schematic sectional drawing which shows the mode of a connection with a photovoltaic cell and a tab wire. It is a schematic sectional drawing which shows another example of the mode of a connection with a photovoltaic cell and a tab wire. It is the schematic plan view which looked at the photovoltaic cell which concerns on a modification from the light-receiving surface side. It is a figure which shows the result of the effect confirmation test which concerns on an Example. It is a figure which shows the result of the effect confirmation test which concerns on a comparative example.

  Hereinafter, preferred embodiments of a method for producing a solar cell module according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a solar cell module manufactured using the method for manufacturing a solar cell module according to the first embodiment of the present invention. As shown in the figure, the solar cell module 1 is configured by electrically connecting a plurality of solar cells 2 to each other by tab wires 3.

  One side of the solar battery cell 2 is a light receiving surface 2a on which a surface electrode is formed, and the other side of the solar battery cell 2 is a back surface 2b on which a back electrode is formed. Between adjacent solar cells 2, 2, the surface electrode on the light receiving surface 2 a side and the back electrode on the back surface 2 b side are connected by the tab wire 3, thereby the strings in which the solar cells 2 are connected in series. Is formed.

  The solar cell module 1 as a product includes, for example, a matrix in which a plurality of strings are arranged. The solar cell module 1 is laminated together with the front cover on the light receiving surface 2a side for protection and the back sheet on the back surface 2b side in a state where the matrix is sandwiched between sealing adhesive sheets. It is completed by attaching a metal frame.

  As the sealing adhesive, a translucent adhesive such as ethylene vinyl alcohol (EVA) resin is used. For the front cover, for example, a light-transmitting material such as glass is used, and for the back sheet, for example, a laminated body in which glass or aluminum foil is sandwiched between resin films is used.

  Next, the manufacturing method of the solar cell module 1 will be described in more detail. In the description, first, the configuration of the solar battery cell 2 will be described. FIG. 2 is a schematic plan view showing the light receiving surface side of the solar battery cell, and FIG. 3 is a schematic plan view showing the back surface side of the solar battery cell. As shown in FIGS. 2 and 3, the solar battery cell 2 has a substrate 11.

  The substrate 11 is formed in a substantially square shape by at least one of, for example, Si single crystal, polycrystal, and non-crystal, and the four corners of the substrate 11 are chamfered in an arc shape. One surface of the substrate 11 corresponds to the light receiving surface 2 a of the solar battery cell 2, and the other surface of the substrate 11 corresponds to the back surface 2 b of the solar battery cell 2. The substrate 11 may be an n-type semiconductor or a p-type semiconductor on the light receiving surface 2a side.

  On the light receiving surface 2a side of the substrate 11, as shown in FIG. 2, a plurality of finger electrodes 12 are provided as surface electrodes. The finger electrodes 12 are formed on a substantially entire surface of the light receiving surface 2a of the substrate 11 in a direction substantially orthogonal to the extending direction of the strings of the solar cell module 1, and are arranged at a predetermined interval along the extending direction of the strings. Yes.

  The finger electrode 12 is formed by applying and heating a metal paste, for example. The thickness of the finger electrode 12 is, for example, 10 μm to 30 μm, and the width of the finger electrode 12 is, for example, 5 μm to 90 μm. Moreover, the space | interval between adjacent finger electrodes 12 and 12 is about 2 mm, for example.

  As a forming material of the finger electrode 12, it is formed by a glass paste containing silver, a silver paste in which various conductive particles are dispersed in an adhesive resin, a gold paste, a carbon paste, a nickel paste, an aluminum paste, and baking / vapor deposition. ITO etc. are mentioned. Among these, it is preferable to use a glass paste containing silver from the viewpoint of heat resistance, conductivity, stability, and cost.

  As shown in FIG. 3, a bus bar electrode 13 and a back electrode 14 are provided on the back surface 2 b side of the substrate 11. The bus bar electrode 13 is provided in a pair of straight lines at positions corresponding to the arrangement regions P, P of the tab line 3 on the light receiving surface 2a side. The bus bar electrode 13 is formed by applying and heating a metal paste, for example, in the same manner as the finger electrode 12. The width of the bus bar electrode 13 is about 2 mm, for example.

  The back electrode 14 is formed, for example, by baking an aluminum paste. Of the back surface 2b side of the substrate 11, it is formed over the entire region except for the portion where the bus bar electrode 13 is formed. On the back surface 2 b side, arrangement regions P and P of the pair of tab lines 3 are set along the bus bar electrode 13. The tab wire 3 is connected to the bus bar electrode 13 and the back electrode 14 through the adhesive film 15. For example, the arrangement region P is set linearly over substantially the entire length of the bus bar electrode 13.

  Next, the adhesive film 15 (refer FIG. 4) used for the connection of the tab wire 3 is demonstrated.

  The conductive adhesive used for the adhesive film 15 is, for example, 25 parts by mass of a film-forming resin, 20 parts by mass of a thermosetting resin, 55 parts by mass of a curing agent for the thermosetting resin, and 10 parts by mass of silicone particles. And 10 parts by mass of conductive particles.

  As the film-forming resin, for example, a thermoplastic polymer such as a phenoxy resin, a polyester resin, and a polyamide resin is used from the viewpoint that good film formation can be performed. Among these resins, it is preferable to use a phenoxy resin. The weight average molecular weight of the thermoplastic polymer is preferably 10,000 to 10,000,000 in consideration of the fluidity of the adhesive film 15.

  Examples of the thermosetting resin include epoxy resins, polyimide resins, unsaturated polyester resins, polyurethane resins, bismaleimide resins, triazine-bismaleimide resins, and phenol resins. Among these resins, it is preferable to use an epoxy resin in consideration of heat resistance.

  The curing agent for a thermosetting resin refers to a material that accelerates the curing of the thermosetting resin when heated together with the thermosetting resin. Such curing agents include imidazole curing agents, hydrazide curing agents, amine curing agents, phenol curing agents, acid anhydride curing agents, boron trifluoride-amine complexes, sulfonium salts, iodonium salts, polyamine salts. , Amine imides, and dicyandiamide are used. When an epoxy resin is used as the thermosetting resin, it is preferable to use an imidazole curing agent, a hydrazide curing agent, a boron trifluoride amine complex, a sulfonium salt, an amine imide, a polyamine salt, and dicyandiamide.

  As the silicone particles, silicone rubber particles, silicone resin particles, silicone composite particles and the like are used. The silicone rubber particles are, for example, silicone rubber particles having a structure in which linear dimethylpolysiloxane is crosslinked. The silicone resin particles are, for example, particles of a cured polyorganosilsesquioxane having a structure in which a siloxane bond is crosslinked in a three-dimensional network represented by (RSiO3 / 2) n.

  Examples of the conductive particles include gold particles, silver particles, copper particles, nickel particles, gold plated nickel particles, gold / nickel plated plastic particles, copper plated particles, and nickel plated particles. From the viewpoint of ensuring conductivity, the average particle size of the conductive particles is preferably 1 μm to 20 μm, and more preferably 1 μm to 5 μm.

  Further, the conductive adhesive may contain a coupling agent for improving the adhesion and wettability with the adherend. Examples of the coupling agent include silane coupling agents and titanate coupling agents.

  In addition, in the bus bar electrodeless type solar battery cell such as the above-described solar battery cell 2, when the tab wire 3 and the finger electrode 12 are directly connected, there are conductive particles of 5 μm or more on the finger electrode 12. It is also conceivable that conduction between the tab wire 3 and the finger electrode 12 is hindered. Therefore, instead of the conductive adhesive, an adhesive film 15 using an insulating adhesive not including conductive particles may be used. In this case, it is possible to suppress the occurrence of poor conduction between the tab wire 3 and the finger electrode 12 as described above.

  In forming the adhesive film 15, a resin composition in which the above film-forming resin, thermosetting resin, curing agent, conductive particles and the like are dissolved in a solvent is applied to a peeling substrate using a bar coater or a coating device. To do. And the adhesive film 15 which has a predetermined dimension is obtained by drying the composition on a peeling base material using a heat oven or a heat-drying apparatus.

  The thickness of the adhesive film 15 is appropriately set in consideration of the relationship with the thickness of the finger electrode 12. The thickness of the adhesive film 15 is set so that, for example, the ratio of the thickness of the finger electrode 12 to the thickness of the adhesive film 15 is in the range of 1: 5 to 6: 5. The width of the adhesive film 15 is set to be smaller than the width of the tab line 3. For example, when the width of the tab wire 3 is about 1.5 mm, the width of the adhesive film 15 is set to about 1.2 mm.

  Then, the connection method of the photovoltaic cell 2 and the tab wire 3 is demonstrated. FIG. 4 is a schematic cross-sectional view showing a state of connection between solar cells and tab wires. In the same figure, the cross section which cut | disconnected the arrangement | positioning area | region P of the tab line 3 in the longitudinal direction is shown in figure.

  As shown in FIG. 4, when connecting the solar cell 2 and the tab wire 3, first, it sets to the stage S in the state which faced the light-receiving surface 2a upwards. Next, the adhesive film 15 is affixed along the arrangement region P of the tab line 3 on the light receiving surface 2 a side, and the tab line 3 is temporarily fixed on the adhesive film 15. As the tab wire 3, for example, a copper ribbon whose surface is covered with solder with a width of about 1.5 mm is used. However, the tab wire 3 is not limited to this and may be one that does not cover the surface with solder.

  After temporarily fixing the tab wire 3, the tab wire 3 and the solar battery cell 2 are thermocompression bonded using, for example, a thermocompression bonding machine K. The thermocompression bonding machine K includes a flat plate-like pressure member 21 that faces the solar battery cell 2 and a hot air supply nozzle (hot air supply unit) 22 that supplies hot air toward the solar battery cell 2.

  The pressure member 21 has a width that is wider than the width of the tab wire 3. By making the width of the pressing member 21 wider than the width of the tab wire 3, the pressure applied to the arrangement region P of the tab wire 3 is made uniform. The hot air supply nozzles 22 are arranged at predetermined intervals along the longitudinal direction of the adhesive film 15. The pressure member 21 is arranged in a direction along the arrangement direction of the hot air supply nozzles 22 and is supported by the support member 23 from the discharge port of the hot air supply nozzle 22 at a predetermined interval. The hot air discharged from the discharge port of the hot air supply nozzle 22 heats the connection position of the pressure member 21 and the tab wire 3.

  By the application of pressure, the adhesive film 15 is pressed against the uneven surface formed by the finger electrodes 12 arranged on the light receiving surface 2a. By such pressing on the uneven surface, the resin of the adhesive film 15 is sufficiently eliminated at the time of pressure bonding, and the connection between the finger electrode 12 and the tab wire 3 is realized well. At the time of thermocompression bonding, the temperature of the pressure member 21 is set to about 80 ° C. to 320 ° C. both in the upper and lower directions, and pressure is applied so that the pressure applied to the arrangement region P of the tab wire 3 is 1.0 MPa or less. The time for applying the pressure is preferably about 1 to 30 seconds. The applied pressure is more preferably 0.5 MPa or less.

  During thermocompression bonding, hot air is blown against the adhesive film 15 to accelerate the curing of the adhesive. Hot air from the hot air supply nozzle 22 heats the pressure member 21 together with the adhesive film 15. For this reason, hardening of the adhesive film 15 can be implemented suitably. The temperature of the hot air is preferably higher than the curing temperature of the adhesive film 15, and is set to about 80 ° C. to 320 ° C., for example. Moreover, it is preferable that the blowing time of a hot air shall be about 1 second-50 seconds, for example. Since a plurality of hot air supply nozzles are arranged along the longitudinal direction of the adhesive film 15, the uniformity of curing of the adhesive film 15 can be improved. The same process is also performed on the back surface 2b side of the solar battery cell 2, and the tab wire 3 on the back surface 2b side is connected to obtain the solar cell module 1 shown in FIG.

  As described above, in this solar cell module manufacturing method, the tab wire 3 is directly connected to the finger electrode 12 via the adhesive film 15 in the so-called bus bar electrodeless solar cell 2. In this method, when the pressure from the pressing member 21 is applied to the tab wire 3, the adhesive film 15 is pressed against the uneven surface formed by the finger electrodes 12 arranged on the light receiving surface 2a. Therefore, even when pressing is performed with a pressure member 21 having a width wider than the line width of the tab wire 3 at a low pressure of 1.0 MPa or less, the resin film of the adhesive film 15 is sufficiently removed during the pressing. It is possible to achieve good connection while preventing the solar cell 2 from cracking. Moreover, in this solar cell module manufacturing method, the pressure member 21 is disposed in the hot air supply nozzle 22 for supplying hot air. For this reason, since the pressurization member 21 can be heated uniformly by the hot air supply nozzle 22, the adhesive film 15 can be suitably cured.

In the present embodiment, the finger electrode 12 has a thickness of 10 μm to 30 μm and a width of 5 μm to 90 μm. Moreover, the ratio of the thickness of the finger electrode 12 to the thickness of the adhesive film 15 is in the range of 1: 5 to 6: 5. By satisfying such a range, the uneven surface formed by the finger electrodes 12 is sufficiently formed on the adhesive film 15. Therefore, it is possible to further sufficiently secure the resin exclusion during the pressure bonding.
[Second Embodiment]

  FIG. 5 is a schematic plan view showing a light receiving surface side of a solar battery cell to which a method for manufacturing a solar battery module according to a second embodiment of the present invention is applied. As shown in the figure, the second embodiment is different from the first embodiment in that a bus bar electrode 33 that connects the finger electrodes 12 is provided on the light receiving surface 32 a side of the solar battery cell 32.

  The bus bar electrode 33 is provided in a straight line substantially orthogonal to the finger electrode 12 so as to straddle all the finger electrodes 12 on the light receiving surface 32 a along the arrangement region P of the tab wire 3. The bus bar electrode 33 is formed by applying and heating a metal paste in the same manner as the bus bar electrode 13 on the back surface 2b side. The thickness of the bus bar electrode 33 is, for example, 10 μm to 30 μm. Moreover, the width | variety of the bus-bar electrode 33 is smaller than the width | variety of the bus-bar electrode 13, for example, is 90 micrometers or less, Preferably they are 5 micrometers-90 micrometers.

  Also in 2nd Embodiment, after temporarily fixing the tab wire 3, as shown in FIG. 6, the tab wire 3 and the photovoltaic cell 2 are thermocompression-bonded using the thermocompression bonding machine K, for example. In FIG. 6, the cross section which cut | disconnected the arrangement | positioning area | region P of the tab wire 3 in the direction orthogonal to a longitudinal direction is shown in figure. As shown in the figure, by performing thermocompression bonding using a pressure member 21 having a width wider than the width of the tab wire 3, it is added to the arrangement region P of the tab wire 3 as in the case of the first embodiment. The pressure uniformity can be increased.

  Moreover, the adhesive film 15 is locally pressed by the bus bar electrode 33 having a narrower width than the adhesive film 15 by the application of pressure. By such local pressing, the resin of the adhesive film 15 is sufficiently eliminated at the time of pressure bonding, and the connection between the bus bar electrode 33 and the tab wire 3 is realized well. Furthermore, since the pressurizing member 21 is disposed in the hot air supply nozzle 22 for supplying hot air, the pressurizing member 21 can be uniformly heated by the hot air supply nozzle 22 and the adhesive film 15 can be suitably cured.

  The present invention is not limited to the above embodiment, and various modifications can be applied. For example, in the said embodiment, although the adhesive film 15 is illustrated, it is not restricted to a film-form adhesive, You may use a paste-form adhesive. Moreover, in the said embodiment, although the pressurization member 21 is provided in the front end side of the hot air supply nozzle 22 extended in the thickness direction of the photovoltaic cell 2 in the thermocompression bonding machine K, it extends in the surface direction of the photovoltaic cell 2. The pressurizing member 21 may be provided on the distal end side of the hot air supply nozzle 22.

  Further, as shown in FIG. 7, in the thermocompression bonding machine K, the pressure member 21 is supported by the tips of a plurality of load pins 25 arranged at a predetermined interval, and a hot air supply nozzle ( A hot air supply unit) 26 may be arranged. Further, an elastic sheet 27 made of rubber or the like may be provided on the pressing surface of the pressing member 21 to the tab wire 3. By providing such an elastic sheet 27, the tab wire 3 can be protected during thermocompression bonding. The elastic sheet 27 may be applied in the form shown in FIG. 4 and the form according to the above-described modification.

  Further, as in the solar battery cell 42 shown in FIG. 8, only a part of the finger electrodes 12 may be connected by the bus bar electrode 43 on the light receiving surface 42 a. In the example shown in FIG. 8, only a few finger electrodes 12 positioned on the end side of the light receiving surface 42a are connected by the bus bar electrodes 43 having the same width as in the second embodiment. In addition, an arrangement region P of the tab wire 3 is set so that at least a part of the finger electrode 12 located on the center side of the light receiving surface 42 a overlaps the bus bar electrode 43.

  Even if it is such a form, the adhesive film 15 is pressed by the uneven surface which the finger electrode 12 arranged in the light-receiving surface 42a makes. Therefore, even when pressing is performed with a pressure member 21 having a width wider than the line width of the tab wire 3 at a low pressure of 1.0 MPa or less, the resin film of the adhesive film 15 is sufficiently removed during the pressing. It is possible to achieve good connection while preventing the solar battery cell 42 from cracking. Moreover, since the pressurization member 21 is arrange | positioned at the hot-air supply nozzle 22 which supplies a hot air, the pressurization member 21 can be heated uniformly with the hot-air supply nozzle 22, and hardening of the adhesive film 15 can be implemented suitably.

Further, in this embodiment, the bus bar electrode 43 at the end of the light receiving surface 42a can be used as an alignment mark when the tab wire 3 is arranged, while being collected from the finger electrode 12 at the end of the light receiving surface 42a by the bus bar electrode 43. I can do electricity. Therefore, it can also avoid that the current collection efficiency of the solar cell module 1 falls.
[Example]

  Examples of the present invention will be described below. In a present Example, the solar cell and a tab wire are connected with the manufacturing method of the solar cell module which concerns on Examples 1-5 and Comparative Examples 1-3, the presence or absence of generation | occurrence | production of the cell crack of a solar cell module, and connection reliability Sex was evaluated.

  An infrared camera was used to confirm the presence or absence of cell cracks. After connecting the tab wire to the solar cell, a current of 5 A was passed to cause the solar cell to emit light and acquire an image. A cell crack having a length of 50 μm or more and a width of 0.1 μm or more within a range of 10 mm or less from both ends of the tab wire was not confirmed, and A was confirmed as B.

For the evaluation of connection reliability, a solar simulator (WXS-2000S-20CH, AM1.5G manufactured by Wacom Denso Co., Ltd.) was used. After connecting the tab wires to the solar cells, the curve factor of the solar cell module at the initial connection stage was measured with a solar simulator. A curve factor of 70 or more was A, and a curve factor of less than 70 was B.
[Example 1]

  In Example 1, 25 parts by mass of a phenoxy resin (PKHC manufactured by Union Carbide Co., Ltd.) and a resin in which acrylic rubber fine particles are dispersed in a bisphenol A type epoxy resin (containing 17% by mass of acrylic fine particles, epoxy equivalents 220 to 240) 10 parts by mass, 10 parts by mass of cresol novolac type epoxy resin (epoxy equivalents 163 to 175), 10 parts by mass of silica fine particles KMP-605 (average particle size 2 μm manufactured by Shin-Etsu Chemical Co., Ltd.), nickel conductive particles (Fukuda Metallic Foil) 10 parts by mass of NiPF-BQ manufactured by Flour Industries Co., Ltd., 10 parts by weight of a curing agent (manufactured by Asahi Kasei Chemical Industry Co., Ltd .: microcapsules having an average particle diameter of 5 μm coated with polyurethane on the surface of an imidazole-modified product. Master in which mold curing agent is dispersed in liquid bisphenol F type epoxy resin The pitch-type curing agent) were blended 55 parts by mass, to prepare a adhesive film.

  Next, an adhesive film was applied to the peel-treated PET using a bar coater and dried in an oven at 80 ° C. for 5 minutes to prepare an adhesive film having a thickness of 25 μm. Thereafter, the obtained adhesive film was cut into a width of 1.2 mm.

After producing the adhesive film, a 5-inch solar cell in which 57 finger electrodes (thickness 20 μm, width 0.1 mm) are formed on the light receiving surface and two bus bar electrodes (width 2 mm) are formed on the back surface ( 125 mm × 125 mm thickness 200 μm) was prepared. Next, an adhesive film was attached to the finger electrode on the light receiving surface and the bus bar electrode on the back surface, and a tab wire having a width of 1.5 mm was temporarily fixed. Then, by using a thermocompression bonding machine for solar cells (HBS02608 manufactured by Shibaura Mechatronics Co., Ltd.), the solar cells are connected to the tab wires by thermocompression bonding at a temperature of 180 ° C., a pressure of 1.0 MPa, and a pressure bonding time of 10 seconds. The solar cell module according to Example 1 was obtained.
[Example 2]

An adhesive film was prepared in the same manner as in Example 1. For the thermocompression bonding of the tab wire, a soldering device (simplified tab attaching device NTS-150-Ms manufactured by NPC Co., Ltd.) improved for tab wire connection was used. In this device, the hot air supply nozzles arranged along the longitudinal direction of the tab line are connected to the front end side by a pressure member having a width wider than the line width of the tab line, and hot air is supplied from the hot air supply nozzle. The pressurizing member is used to pressurize the area where the tab wires are arranged. Using this apparatus, a solar cell module according to Example 2 was obtained under the conditions of a stage temperature of 170 ° C., a hot air temperature of 200 ° C., a pressure of 0.3 MPa, and a connection time of 3 seconds.
[Example 3]

The solar according to Example 3 is the same as Example 2 except that 30 parts by mass of solder conductive particles (Mitsui Metal Mining Co., Ltd. Sn96.5-Ag3.5 average particle size 10 μm) were used for the production of the adhesive film. A battery module was obtained.
[Example 4]

The solar cell module according to Example 4 was the same as Example 2 except that 30 parts by mass of nickel conductive particles (Bright 25NR20-MX average particle size 20 μm manufactured by Nippon Kagaku Kogyo Co., Ltd.) were used for the production of the adhesive film. Obtained.
[Example 5]

A solar cell module according to Example 5 was obtained in the same manner as in Example 2 except that the conductive particles were not used for production of the adhesive film.
[Comparative Example 1]

An adhesive film was prepared in the same manner as in Example 1. After the production of the adhesive film, 57 finger electrodes (width 0.1 mm) and two bus bar electrodes (width 2.0 mm) are formed on the light receiving surface, and two bus bar electrodes (width 2 mm) are formed on the back surface. A prepared 5-inch solar cell (125 mm × 125 mm, thickness 200 μm) was prepared. And the solar cell and the tab wire were connected in the same manner as in Example 2 to obtain a solar cell module according to Comparative Example 1.
[Comparative Example 2]

A solar cell module according to Comparative Example 2 was obtained in the same manner as Comparative Example 1 except that the conductive particles were not used for the production of the adhesive film.
[Comparative Example 3]

A solar cell module according to Comparative Example 3 was obtained in the same manner as Comparative Example 1 except that the pressure at the time of thermocompression bonding by the solar cell thermocompression bonding machine was 2.0 MPa.
[Effect confirmation test results]

  FIG. 9 is a diagram illustrating the results of the effect confirmation test according to the example. Moreover, FIG. 10 is a figure which shows the result of the effect confirmation test which concerns on a comparative example. As shown in FIG. 9, in Examples 1-5, the cell crack of the photovoltaic cell did not generate | occur | produce, and it was confirmed that it has the outstanding performance also in the initial stage connection. On the other hand, as shown in FIG. 10, in Comparative Examples 1 and 2, cell cracking of the solar battery cell does not occur because thermocompression bonding is performed at a low pressure of 1.0 MPa or less, but the value of the curve factor is low. It was confirmed that the performance of initial connection was inferior compared with Examples 1-5. In Comparative Example 3 in which thermocompression bonding was performed at a high pressure of 2.0 MPa, it was confirmed that cell cracking of the solar battery cell occurred.

  DESCRIPTION OF SYMBOLS 1 ... Solar cell module, 2, 32, 42 ... Solar cell, 2a, 32a, 42a ... Light-receiving surface, 3 ... Tab wire, 12 ... Finger electrode, 15 ... Adhesive film, 21 ... Pressure member, 22, 26 ... Hot air supply nozzle (hot air supply part), 33, 43 ... Busbar electrode, P ... Arrangement area of tab line.

Claims (10)

A method for manufacturing a solar cell module for connecting finger electrodes and tab wires arranged on a light receiving surface of a solar cell cell using an adhesive film,
The light receiving surface of the solar battery cell is not provided with a bus bar electrode connecting the finger electrodes,
In the area where the tab lines are arranged on the finger electrodes, the tab lines are arranged via the adhesive film,
A pressurizing member having a width wider than the line width of the tab wire is arranged in the hot air supply unit for supplying hot air, and the hot air is supplied by the hot air supply unit, while the pressurizing member is used to arrange the tab line. A method for producing a solar cell module, comprising applying a pressure of 1.0 MPa or less and thermocompression bonding the tab wire. A method for manufacturing a solar cell module for connecting finger electrodes and tab wires arranged on a light receiving surface of a solar cell cell using an adhesive film,
On the light receiving surface of the solar battery cell, a bus bar electrode connecting the finger electrodes is provided with a width narrower than the width of the adhesive film,
In the area where the tab lines are arranged on the bus bar electrode, the tab lines are arranged via the adhesive film,
A pressurizing member having a width wider than the line width of the tab wire is arranged in the hot air supply unit for supplying hot air, and the hot air is supplied by the hot air supply unit, while the pressurizing member is used to arrange the tab line. A method for producing a solar cell module, comprising applying a pressure of 1.0 MPa or less and thermocompression bonding the tab wire. A method for manufacturing a solar cell module for connecting finger electrodes and tab wires arranged on a light receiving surface of a solar cell cell using an adhesive film,
On the light receiving surface of the solar cell, a bus bar electrode connecting the finger electrodes is provided only on the end side of the light receiving surface with a width narrower than the width of the adhesive film,
In the tab line arrangement region on the finger electrode located on the center side of the light receiving surface, the tab line is arranged via the adhesive film so as to at least partially overlap the bus bar electrode,
A pressurizing member having a width wider than the line width of the tab wire is arranged in the hot air supply unit for supplying hot air, and the hot air is supplied by the hot air supply unit, while the pressurizing member is used to arrange the tab line. A method for producing a solar cell module, comprising applying a pressure of 1.0 MPa or less and thermocompression bonding the tab wire.   The method for manufacturing a solar cell module according to claim 1, wherein the tab line is disposed so as to straddle all the finger electrodes on the light receiving surface.   4. The method for manufacturing a solar cell module according to claim 1, wherein the finger electrode has a thickness of 10 μm to 30 μm and a width of 5 μm to 90 μm.   The method of manufacturing a solar cell module according to claim 1 or 3, wherein a ratio of the thickness of the finger electrode to the thickness of the adhesive film is in the range of 1: 5 to 6: 5.   4. The method for manufacturing a solar cell module according to claim 2, wherein the bus bar electrode has a width of 90 [mu] m or less.   4. The method for manufacturing a solar cell module according to claim 2, wherein the bus bar electrode has a thickness of 10 μm to 30 μm and a width of 5 μm to 90 μm.   The method for manufacturing a solar cell module according to any one of claims 1 to 8, wherein the tab wire is thermocompression-bonded by applying a pressure of 0.5 MPa or less to the tab wire arrangement region.   The method for manufacturing a solar cell module according to claim 1, wherein a conductive adhesive film or an insulating adhesive film is used as the adhesive film.

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