JP2013038269A - Solar cell module sealing method and solar cell module sealing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To complete a sealing process in a short time and to reduce residual air in a solar cell module.SOLUTION: A layered body 10, 20 is heated and pressurized at a temperature lower than the melting temperature of a sealing resin, to soften the sealing resin. Then, the layered body 10, 20 is heated and pressurized to increase the temperature from a central part of the layered body 10, 20, to melt the sealing resin.

Description

  The present invention relates to a solar cell module sealing method and a solar cell module sealing device in which a sealing resin is interposed between a pair of plate members to seal a solar battery cell or a thin film layer of a solar battery.

  In general, a crystalline solar cell is formed as a solar cell by diffusing and doping various impurities on a hard substrate such as a polycrystalline silicon substrate or a single crystal silicon substrate. Therefore, a solar cell module using this is also a hard module. Become.

  A highly transparent glass plate is used on the surface side. On the other hand, on the back side, a back sheet or glass plate in which various resin films are laminated with an adhesive on an aluminum foil, PET, or fluororesin film having low moisture permeability is used. When installing on the roof or outside of the outer wall, the former is preferred because it does not expect appearance from the back or light transmission, but when installing the solar cell module on the window or the solar cell module itself is the roof plate In order to enhance the appearance from the back side, a module using a glass plate on the back side is used. In these sealings, EVA (ethylene vinyl acetate copolymer) is widely used as the sealing resin.

In the conventional thin-film solar cell and compound solar cell, the above-mentioned situation has not changed. However, in recent years, in the CdTe-CdS solar cell, expecting an improvement in the strength of the laminated glass by using a glass plate as the back surface material The method of omitting the peripheral reinforcing aluminum frame, which was essential in the solar cell, is used.
This structure uses a glass plate on the back side as a strength member to maintain strength without using an aluminum reinforcing frame, and by utilizing the high oxygen barrier performance and steam barrier performance peculiar to glass, by laminating various films By omitting the backsheet, significant cost reduction has been realized.

  As a conventional sealing process using EVA, for example, there is a process described in Patent Document 1. In the method disclosed in Patent Document 1, first, while pre-evacuating, preheating to below the softening point of EVA (for example, 80 degrees or more) and then further heating to a temperature at which EVA is softened (for example, 110 degrees or more). Raise the temperature. Then, heating is performed to a temperature at which cross-linking proceeds satisfactorily (for example, about 150 ° C.), pressing is performed in a vacuum, cooling is performed to some extent, and then a large number is cured in an oven.

Japanese Patent Laid-Open No. 11-238898

  However, the method described in Patent Document 1 requires a long heating process with evacuation, and the processing time is long. Moreover, in the method which does not evacuate, there exists a possibility that air may remain in a solar cell module. And the air which remained in the solar cell module causes troubles, such as the fall of the transmittance | permeability of light, or a beauty | look being impaired.

  The objective of this invention provides the sealing method of a solar cell module and the sealing device of a solar cell module which can perform the sealing process in a short time, and can reduce the air which remains in a solar cell module. There is.

In order to solve the above-described problems and achieve the object of the present invention, the solar cell module sealing method of the present invention is a method of sealing a solar cell module by interposing a sealing resin between a pair of plate members. And it has the process shown to the following (1) to (3).
(1) A lamination process in which a pair of plate materials and a sealing resin are laminated to form a laminate.
(2) A first heating and pressing step in which the laminate is heated and pressurized at a temperature lower than the temperature at which the sealing resin melts.
(3) The laminate heated and pressurized in the first heating and pressing step is heated and pressurized at a temperature higher than that in the first heating and pressing step, and the temperature is raised from the center of the laminate to melt the sealing resin. A second heating and pressurizing step.

The solar cell module sealing device of the present invention is used in the above-described solar cell module sealing method, and includes a first heating and pressing unit and a second heating and pressing unit. ing.
The first heating and pressurizing unit heats and pressurizes the laminate in which the pair of plate materials and the sealing resin are stacked at a temperature lower than the temperature at which the sealing resin melts. The second heat and pressure unit heats and pressurizes the laminate at a temperature higher than that of the first heat and pressure unit, and raises the temperature from the center of the laminate to melt the sealing resin.

  According to the sealing method and the sealing device of the solar cell module of the present invention, the sealing process can be performed without necessarily evacuating, so that the processing time can be shortened. Furthermore, in the second heating and pressurizing step, the temperature remaining in the solar cell module can be pushed out from the peripheral portion of the solar cell module by heating the solar cell module from the central portion.

It is sectional drawing which shows an example of the solar cell module before a sealing process is performed. It is sectional drawing which shows the other example of the solar cell module before a sealing process is performed. It is a schematic block diagram in the 1st Embodiment of the sealing apparatus of the solar cell module of this invention. It is a schematic block diagram which shows the 2nd heating-pressing unit in the sealing device of the solar cell module shown in FIG. It is a flowchart which shows the flow of the sealing process concerning the sealing method of the solar cell module of this invention. It is a condition figure which shows the process conditions in the sealing device of the solar cell module shown in FIG. It is a graph which shows the temperature of sealing resin in each process of the sealing device of the solar cell module shown in FIG. It is a schematic block diagram which shows the 2nd heating-pressing unit concerning the 2nd example in the sealing apparatus of the solar cell module of this invention. It is a graph which shows the temperature of sealing resin in each process of the sealing device of the solar cell module shown in FIG. It is a schematic block diagram which shows the 2nd heating-pressing unit concerning the 3rd Embodiment in the sealing apparatus of the solar cell module of this invention. It is a graph which shows the temperature of sealing resin in each process of the sealing apparatus of the solar cell module shown in FIG. It is explanatory drawing which shows the heater of the 2nd heating-pressing unit concerning the further another example in the sealing apparatus of the solar cell module of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sealing method and a sealing device for a solar cell module according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the common member in each figure. The present invention is not limited to the following form.

[Configuration example of solar cell module]
First, a configuration example of a solar cell module (hereinafter referred to as “laminated body”) before the sealing process is performed will be described with reference to FIG.
FIG. 1 is a cross-sectional view illustrating an example of a laminated body. The laminate shown in FIG. 1 is a laminate of thin film solar cell modules.

  As shown in FIG. 1, the laminate 10 includes a glass substrate 1 on the front side, a plate material 3 on the back side, and a sealing resin 2. The glass substrate 1 is composed of a glass plate 1a having excellent transparency, a solar cell thin film 1b formed on the glass plate 1a, and a wiring 1c joined to the solar cell thin film 1b. In addition, the solar cell thin film 1b has a scribe line 1d formed by laser scribing for insulation from the adjacent solar cell thin film 1b.

  A sheet-shaped sealing resin 2 is laminated on the surface of the glass substrate 1 on which the solar cell thin film 1b and the wiring 1c are formed. Examples of the sealing resin 2 include EVA (ethylene vinyl acetate copolymer), PVB (polyvinyl bratinol), and the like. In addition, when PVB is used as the sealing resin 2, it is preferable that the moisture content be kept at 0.5% or less, preferably 0.3% or less.

  In order to prevent the sealing resins 2 from adhering to each other by stacking, the surface layer of the sealing resin 2 is provided with fine irregularities on the surface layer of the sealing resin 2. Then, the plate material 3 is superimposed on the sealing resin 2. As the board | plate material 3, the back sheet etc. which laminated | stacked various resin films with the adhesive agent on the glass plate, the aluminum foil with low moisture permeability, PET, or a fluororesin film are used, for example.

Next, the structure of the laminated body concerning another example is demonstrated with reference to FIG.
FIG. 2 is a cross-sectional view illustrating another example of the laminated body. The laminated body shown in FIG. 2 is a laminated body of a crystalline solar cell module.

  As shown in FIG. 2, the laminate 20 includes a glass plate 21 on the front side, a plate member 23 on the back side, a cell string 24 interposed between the glass plate 21 and the plate member 23, and a sealing resin 2. And have. The glass plate 21 has the same configuration as that of the glass plate 1a applied to the laminate 10 of the thin film solar cell module, and the plate member 23 has the same configuration as that of the plate member 3 of the laminate 10. . Further, the sealing resin 2 has the same configuration as that of the laminate 10. Therefore, the description thereof is omitted here.

  The cell string 24 includes a plurality of cells 24a and wirings 24b. The cell 24a has electrode patterns on both sides. Wirings 24b are attached to the front and back of the cell 24a. The sheet-shaped sealing resin 2 is interposed between the cell string 24 and the glass plate 21 and between the cell string 24 and the plate member 23.

1. First Embodiment [Solar Cell Module Sealing Device]
Next, a configuration of a solar cell module sealing device (hereinafter referred to as “sealing device”) according to a first embodiment of the present invention (hereinafter referred to as “present example”) will be described with reference to FIGS. This will be described with reference to FIG.
FIG. 3 is a schematic configuration diagram showing the sealing device of this example, and FIG. 4 is a schematic configuration diagram showing a second heating and pressing unit according to the sealing device of this example.

  As shown in FIG. 3, the sealing device 100 includes an input stage 101, a transport unit 102, a preheating unit 103, a first heating and pressing unit 104, a second heating and pressing unit 105, and an extraction stage. 106. The take-out stage 106 is disposed on the downstream side of the input stage 101, the first heating / pressurizing unit 104, and the second heating / pressurizing unit 105.

  The input stage 101 is a roller conveyor composed of a plurality of rollers 111. In the charging stage 101, the above-described stacked bodies 10 and 20 are stacked. Note that the stacking process may be performed on another stage, and the stacked stacks 10 and 20 may be placed on the roller 111 of the charging stage 101. The stacked bodies 10 and 20 are sent to the transport unit 102 as the roller 111 of the charging stage 101 rotates.

  The conveyance unit 102 is a belt conveyor including a belt 121, a driving roller 122, a first driven roller 123a, and a second driven roller 123b. In addition to the belt conveyor, a roller drive type or other various types of conveying devices may be used as the conveying unit 102.

  The belt 121 needs to withstand repeated sealing temperatures and sealing pressures. Therefore, as the belt 121, for example, a silicon rubber sheet reinforced with glass fiber is used. The belt 121 is an endless belt. The belt 121 is stretched around the driving roller 122, the first driven roller 123a, and the second driven roller 123b.

  The first driven roller 123a is disposed on the input stage 101 side, and the second driven roller 123b is disposed on the take-out stage 106 side provided behind the input stage 101 in the transport direction. The belt 121 is held flat between the input stage 101 and the take-out stage 106 by the first driven roller 123a and the second driven roller 123b.

  The driving roller 122 is wound around the belt 121. By driving the driving roller 122, the belt 121 is rotationally driven. By the transport unit 102, the stacked bodies 10 and 20 are transported in the order of the preheating unit 103, the first heating and pressing unit 104, and the second heating and pressing unit 105.

  The preheating unit 103 is composed of, for example, an infrared lamp. The preheating unit 103 heats the laminates 10 and 20 sent from the charging stage 101 to the belt 121. The workpiece temperature and processing time of the preheating unit 103 will be described later. Then, the stacked bodies 10 and 20 warmed by the preheating unit 103 are conveyed to the first heating and pressing unit 104.

  The first heating and pressing unit 104 includes a heating stage 141, a heating and pressing head 142, and a pressing mechanism 143 that drives the heating and pressing head 142 up and down. A heater is built in the heating stage 141 and the heating and pressing head 142.

  The heating stage 141 is disposed inside the belt 121. The heating and pressurizing head 142 is disposed to be opposed to the heating stage 141 with the belt 121 interposed therebetween while being supported by the pressurizing mechanism 143 so as to be movable up and down. The pressurizing mechanism 143 incorporates a sensor for monitoring pressurization in real time, and adjusts the pressure applied to the stacked bodies 10 and 20 by the heating and pressurizing head 142. Thereby, the fluctuation of the pressure applied to the laminates 10 and 20 by the heating and pressing head 142 is prevented. The first heating / pressurizing unit 104 can adjust the applied pressure at an arbitrary timing based on a process command from a host controller (not shown).

  The laminated bodies 10 and 20 conveyed to the first heating and pressing unit 104 are sandwiched between the heating stage 141 and the heating and pressing head 142, and are subjected to the first heating and pressing process at a preset temperature, pressure, and time. Is given. The temperature, pressure, and time of the first heating and pressing unit 104 and the state of the stacked bodies 10 and 20 at this time will be described later.

  The laminates 10 and 20 that have been subjected to the first heat and pressure treatment by the first heat and pressure unit 104 are conveyed to the second heat and pressure unit 105. As shown in FIG. 4, the second heating and pressing unit 105 includes a heating stage 151, a heating and pressing head 152, and a pressing mechanism 153 that drives the heating and pressing head 152 up and down.

  The heating stage 151 is disposed below the belt 121. The heating and pressurizing head 152 is arranged to be opposed to the heating stage 151 with the belt 121 interposed therebetween while being supported by the pressurizing mechanism 153 so as to be movable up and down. A cushion sheet (not shown), which is a thick plate of hard heat-resistant rubber, is attached to the surface of the heating and pressing head 152. Examples of the material of the cushion sheet include EPDM rubber.

  Further, a center heater 152a and a peripheral heater 152b are built in the heating and pressurizing head 152. The center heater 152a is disposed at the center of the surface portion of the heating / pressurizing head 152 that contacts the stacked bodies 10 and 20, and heats the center of the stacked bodies 10 and 20. The peripheral heater 152b is disposed in the peripheral portion of the surface portion of the heating / pressurizing head 152 that contacts the stacked bodies 10 and 20, and heats the peripheral portion of the surface of the pair of plate members in the stacked bodies 10 and 20.

  Further, in the heating stage 151, a central heater 151 a and a peripheral heater 151 b are incorporated as in the heating and pressurizing head 152. The central heater 151 a is disposed in the central portion of the heating stage 151, and the peripheral heater 151 b is disposed in the peripheral portion of the heating stage 151. The central heater 151a heats the central portion of the pair of plate members in the laminates 10 and 20, and the peripheral heater 151b heats the peripheral portion of the pair of plate members in the laminates 10 and 20.

  The temperatures of the central heaters 151a and 152a are set higher than the temperatures of the peripheral heaters 151b and 152b. Therefore, the temperature of the laminates 10 and 20 is raised by the second heating and pressing unit 105 from the center portion of the surface of the plate member in the laminates 10 and 20.

  In this example, the temperature of the central heaters 151a and 152a is set higher than that of the peripheral heaters 151b and 152b in both the heating stage 151 and the heating and pressurizing head 152. However, the present invention is not limited to this. The temperature of the central heater 151a, 152a of either the heating stage 151 or the heating / pressurizing head 152 may be set higher than that of the peripheral heaters 151b, 152b.

  The pressurizing mechanism 153 includes a sensor for monitoring pressurization in real time, and adjusts the pressure applied to the stacked bodies 10 and 20 by the heating and pressurizing head 152. Thereby, the fluctuation of the pressure applied to the laminates 10 and 20 by the heating and pressing head 152 is prevented. Similarly to the first heating and pressing unit 104, the second heating and pressing unit 105 can adjust the pressing force at an arbitrary timing based on a process command from a host controller (not shown).

  The laminates 10 and 20 conveyed to the second heating and pressing unit 105 are sandwiched between the heating stage 151 and the heating and pressing head 152, and the second heating and pressing process is performed at a preset temperature, pressure, and time. Is given. And the sealing resin 2 (refer FIG.1 and FIG.2) provided in the laminated bodies 10 and 20 fuse | melts. Further, when a thermosetting resin is used as the sealing resin 2, it is polymerized and cured. Note that the temperature, pressure, and time of the second heating and pressing unit 105 and the state of the stacked bodies 10 and 20 at this time will be described later.

  The laminated bodies 10 and 20 that have been subjected to the second heating and pressing by the second heating and pressing unit 105 are transported to the take-out stage 106. As shown in FIG. 3, the take-out stage 106 is a roller conveyor composed of a plurality of rollers 161 like the input stage 101. The laminated body 10 is unloaded by an unillustrated unloading mechanism while being quickly cooled by natural cooling by the take-out stage 106.

[Method of sealing solar cell module]
Next, a solar cell module sealing method will be described with reference to FIGS.
FIG. 5 is a flowchart showing the flow of the sealing process of the laminates 10 and 20 of this example, FIG. 6 is a condition diagram showing the processing conditions of this example, and FIG. 7 is the sealing resin of the laminate in each step. It is a graph which shows temperature. The workpiece temperature, the pressing force, and the processing time shown in FIG. 6 are appropriately set depending on the material of the sealing resin 2 and the type of the laminate. The conditions shown in FIG. 6 correspond to the thin film solar cell module.

  In the solar cell formation step in advance, in the laminate 10 shown in FIG. 1, the glass substrate 1 is formed by providing the solar cell thin film 1b and the wiring 1c on the glass plate 1a. Further, in the stacked body 20 shown in FIG. 2, a plurality of cells 24a are connected by a wiring 24b to form a cell string 24.

  First, a laminating process is performed in which the glass substrate 1 and the plate material 3, which are a pair of plate materials, and the sealing resin 2 are overlapped (step S1). In addition, in the laminated body 20 shown in FIG. 2, the glass plate 21 and the board | plate material 23 which are a pair of board | plate materials, the cell string 24, and the sealing resin 2 are piled up. The stacking process in step S1 may be performed on the charging stage 101 shown in FIG. 3, or the stacking process may be performed on another stage and conveyed to the charging stage 101. In this laminating process, mutual positioning is performed, but bonding is not performed.

  Next, the preheating process which warms the laminated bodies 10 and 20 by the preheating unit 103 is performed (step S2). The workpiece temperature in the preheating process of step S2 is set to a temperature at which the sealing resin 2 does not soften. For example, as shown in FIG. 6, the workpiece temperature is set to 90 degrees, and the processing time is set to 120 seconds. By this preheating step, temperature unevenness during the temperature rise of the sealing resin 2 can be reduced.

  When the preheating process in step S <b> 2 ends, the stacked bodies 10 and 20 are transported to the first heating and pressing unit 104 as shown in FIG. 3. Next, the laminated body 10 and 20 is subjected to a first heating and pressing step which is the first heating and pressing step by the first heating and pressing unit 104 (step S3).

  The workpiece temperature in step S3 is set to a temperature that is close to the softening temperature of the sealing resin 2 and exhibits a slight fluidity. The applied pressure is set to such a level that the minute unevenness formed on the surface of the sealing resin 2 is not deformed or slightly deformed. For example, as shown in FIG. 6, the workpiece temperature is set to 100 degrees, and the applied pressure is set to 0.05 MPa. The processing time is set to 120 seconds.

  By this first heating and pressurizing step, the sealing resin 2 of the laminates 10 and 20 is internally flowed by pressurization, and in the laminate 10 (in the laminate 10, the glass substrate 1 and the plate 3, in the laminate 20. The glass plate 21 and the plate material 23) are deformed so as to fill the gap. Thereby, the sealing resin 2 fits into the space formed between the pair of plate members. In addition, since the sealing resin 2 does not reach melting completely, air remains in the laminated bodies 10 and 20 depending on the location.

  Next, the laminated bodies 10 and 20 are conveyed to the second heating and pressing unit 105 (see FIG. 4). Then, the second heating and pressurizing unit 105 performs the second heating and pressurizing process, which is the second heating and pressurizing process, on the stacked bodies 10 and 20 (step S4). In step S3, the sealing resin 2 is not completely fixed, but is lightly adhered. Therefore, when conveying from the 1st heat pressurization unit 104 to the 2nd heat pressurization unit 105, the member which comprises the laminated bodies 10 and 20 does not slip | deviate.

  The sealing resin 2 is completely melted by the second heating and pressing step, which is Step S4. In addition, when a thermosetting resin is used as the sealing resin 2, it is polymerized by melting and further heating.

  The workpiece temperature, the applied pressure, and the processing time in step S4 are set to the temperature, the applied pressure, and the processing time at which the sealing resin 2 is completely melted. For example, as shown in FIG. 6, the work temperature of the peripheral heaters 151b and 152b is set to 160 degrees, and the work temperature of the central heaters 151a and 152a is 165 degrees higher than that of the peripheral heaters 151b and 152b. Is set to Further, the applied pressure is set to 0.05 MPa, and the processing time is set to 120 seconds.

  Here, the work temperature of the central heaters 151a and 152a in the second heating and pressing unit 105 is set to be higher than that of the peripheral heaters 151b and 152b. Therefore, the temperature of the central portion of the sealing resin 2 in the laminates 10 and 20 is raised before the peripheral portion as shown in FIG. Then, the sealing resin 2 melts from the central part of the laminates 10 and 20. Therefore, the air remaining in the laminates 10 and 20 is pushed out from the central part of the laminates 10 and 20 to the peripheral part without any delay by the molten sealing resin 2. As a result, the amount of air remaining in the stacked bodies 10 and 20 can be reduced.

  Further, in the first heating and pressurizing step of step S3, the textured unevenness formed on the surface of the sealing resin 2 is not completely crushed, and the sealing resin 2 has a slight stickiness. Therefore, air can be smoothly pushed out from the minute irregularities on the surface of the sealing resin 2 that has been subjected to the embossing process by the second heating and pressing step of step S4.

  And the laminated bodies 10 and 20 are sealed with the sealing resin 2 by the 2nd heating-pressing process of this step S4.

  Next, when the second heating and pressurizing step in Step 4 is completed, the stacked bodies 10 and 20 are transported to the take-out stage 106 and quickly cooled by natural cooling (Step S5). And the laminated bodies 10 and 20 cooled are carried out to the next process (step S6). In general, the next step is a caulking step of the periphery of the solar cell module of the laminates 10 and 20. Thereby, the sealing process of the laminated bodies 10 and 20 is completed.

  In addition, according to the sealing method of the solar cell module of this example, the process time required for one heating and pressing step can be shortened by dividing the step of heating and pressing the stacked bodies 10 and 20 into two times. It is possible to balance the tact with other processes. As a result, the line tact can be prevented from being disturbed, the working efficiency can be improved, and the processing time can be shortened.

2. Second Embodiment Next, a second embodiment of the solar cell module sealing device of the present invention will be described with reference to FIGS.
FIG. 8 is a schematic configuration diagram showing a second heating and pressing unit according to the second embodiment, and FIG. 9 is a diagram when the second heating and pressing unit according to the second embodiment is used. It is a graph which shows the temperature of the sealing resin of the laminated body in each process of.

  The sealing device 200 according to the second embodiment is different from the sealing device 100 according to the first embodiment in the configuration of the second heating and pressing unit. Therefore, here, the second heating and pressurizing unit will be described, and the same reference numerals are given to the portions common to the sealing device 100 according to the first embodiment, and the redundant description will be omitted.

  As shown in FIG. 8, the second heating and pressing unit 205 of the sealing device 200 according to the second embodiment moves the heating stage 251, the heating and pressing head 252, and the heating and pressing head 252 up and down. And a pressurizing mechanism 253 for driving.

  The heating stage 251 includes a central heater 251a and a peripheral heater 251b. The heating / pressurizing head 252 includes a central heater 252a and a peripheral heater 252b. The central heaters 251a and 252a and the peripheral heaters 251b and 252b built in the heating stage 251 and the heating and pressing head 252 are set to the same temperature (see FIG. 9).

  Further, the tip of the heating / pressurizing head 252 that comes into contact with the stacked bodies 10 and 20 bulges toward the heating stage 251, that is, the stacked bodies 10 and 20. The pressing surface of the heating and pressing head 252 may have a curvature in a biaxial direction like a circular ceiling, or may have a curvature only in one direction like a side surface of a cylinder.

  Therefore, the heating / pressurizing head 252 contacts the central portion of the stacked bodies 10 and 20 before the peripheral portions of the stacked bodies 10 and 20. As a result, as shown in FIG. 9, the temperature of the sealing resin 2 of the laminates 10 and 20 is raised at the central portion before the peripheral portion and melts.

  Other configurations are the same as those of the second heating / pressurizing unit 105 according to the first embodiment described above, and a description thereof will be omitted. Also by the second heating and pressing unit 205 having such a configuration, the same operation and effect as the second heating and pressing unit 105 according to the first embodiment described above can be obtained.

  Note that one surface of the heating stage 251 on which the stacked bodies 10 and 20 are placed via the belt 121, that is, one surface facing the heating and pressurizing head 252 is swelled toward the heating stage side. It may be formed. What is necessary is just to form so that the center part of the opposing surface of either one of the heating-pressurization head 252 and the heating stage 251 may bulge toward the laminated bodies 10 and 20 side.

3. Third Embodiment Next, an embodiment of the solar cell module sealing device 300 of the present invention will be described with reference to FIGS. 10 and 11.
FIG. 10 is a schematic configuration diagram showing a second heating and pressing unit according to the second embodiment. FIG. 11 is a graph showing the temperature of the sealing resin of the laminate in each step when using the second heating and pressing unit according to the third embodiment.

  The sealing device 300 according to the third embodiment is different from the sealing device 100 according to the first embodiment in the configuration of the second heating and pressing unit. Therefore, here, the second heating and pressurizing unit will be described, and the same reference numerals are given to the portions common to the sealing device 100 according to the first embodiment, and the redundant description will be omitted.

  As shown in FIG. 10, the second heating and pressing unit 305 of the sealing device 300 according to the third embodiment moves up and down the heating stage 351, the heating and pressing head 352, and the heating and pressing head 352. And a pressurizing mechanism 353 for driving.

  The heating stage 351 includes a central heater 351a and a peripheral heater 351b. The heating / pressurizing head 352 includes a central heater 352a and a peripheral heater 352b. The central heaters 351a and 252a and the peripheral heaters 351b and 352b built in the heating stage 351 and the heating and pressing head 352 are set to the same temperature.

  Further, the heat transfer characteristics of the central heater 351a and the peripheral heater 351b in the heating stage 351 are different. Similarly, the heat transfer characteristics of the central heater 352a and the peripheral heater 352b in the heating and pressing head 352 are different. Specifically, the thermal conductivity of the central heaters 351a and 352a is set higher than the thermal conductivity of the peripheral heaters 351b and 352b. In order to change the thermal conductivity, a material having a high thermal conductivity such as copper is included around the central heaters 351a and 352a, and a material having a low thermal conductivity such as stainless steel is provided around the peripheral heaters 351b and 352b. Is included.

  According to the second heating and pressing unit 305 according to the third embodiment, as shown in FIG. 11, the thermal conductivity of the central heaters 351a and 352a is the thermal conductivity of the peripheral heaters 351b and 352b. Therefore, the temperature of the central part of the stacked bodies 10 and 20 can be raised faster than the peripheral part. And the temperature change of the sealing resin 2 of the laminated bodies 10 and 20 when the second heating and pressing unit 305 according to the third embodiment is used is the same as that of the sealing resin 2 of the laminated bodies 10 and 20. As for the temperature, the central portion is heated earlier than the peripheral portion and melts.

  Other configurations are the same as those of the second heating / pressurizing unit 105 according to the first embodiment described above, and a description thereof will be omitted. Also by the second heating and pressing unit 305 having such a configuration, the same operation and effect as the second heating and pressing unit 105 according to the first embodiment described above can be obtained.

  In the second heating and pressing unit 305 according to the third embodiment, both the heating stage 351 and the heating and pressing head 352 change the thermal conductivity of the central portion and the peripheral portion. It is not limited to. The thermal conductivity of either the heating stage 351 or the heating / pressurizing head 352 may be changed.

  In the second heating and pressurizing units 205 and 305 according to the second embodiment and the third embodiment, the temperature of all the heaters is set to be the same. However, the present invention is not limited to this. Absent. For example, the temperature of the central heaters 251a, 252a, 351a, and 352a is set higher than that of the peripheral heaters 251b, 252b, 352b, and 352b, as in the second heating and pressing unit 105 according to the first embodiment. May be. Furthermore, the central heaters 251a, 252a, 351a, and 352a may be changed so that the temperature becomes higher than that of the peripheral heaters 251b, 252b, 352b, and 352b during the heating and pressurization.

  As described above, the solar cell module sealing method and the sealing device according to the embodiments of the present invention have been described including the effects thereof. However, the solar cell module sealing method and sealing device of the present invention are not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims. Implementation is possible.

  For example, the thickness of the central part of the cushion sheet attached to the surface of the front end part of the heating / pressurizing head is made thinner than the peripheral part so that the temperature of the central part of the laminate is raised before the peripheral part. Good. Moreover, the same effect can also be acquired by making the rubber | gum of the center part of a cushion sheet the heat | fever conductivity excellent compared with the peripheral part.

  Further, in the second heating and pressurizing unit 105 according to the first embodiment, the central portion and the peripheral portion are divided into separate control systems, so that the central heater is set to a higher temperature than the peripheral heater. Although an example is shown, it is also possible to implement this with a single control system as shown in FIG.

FIG. 12 is an explanatory view showing a heater of a second heating and pressing unit according to still another embodiment.
As shown in FIG. 12, the heater wire 452c is concentrated on the central portion of the pressure surface of the heater 452, and the peripheral portion is sparse. Further, by adjusting the temperature with the temperature sensor 456 disposed in the central portion, the temperature of the pressurization surface of the heater 452 can be decreased as going from the central portion to the peripheral portion.

  In the above-described embodiments, it is described that evacuation is not necessary. However, it is naturally possible to assist the extrusion of air by using evacuation together.

  DESCRIPTION OF SYMBOLS 1 ... Glass substrate (plate material), 1a ... Glass plate, 1b ... Solar cell thin film, 1c ... Wiring, 2 ... Sealing resin, 3 ... Plate material, 10, 20 ... Laminated body, 21 ... Glass plate (plate material), 23 ... Plate material 24 ... Cell string 24a ... Cell 24b Wiring 100, 200, 300 ... Sealing device 101 ... Loading stage 102 ... Conveying unit 103 ... Preheating unit 104 ... First heating / pressing unit 105, 205, 305 ... second heating and pressing unit, 106 ... take-out stage, 151, 251 and 351 ... heating stage, 151a, 152a, 251a, 252a, 351a, 352a ... central heater (central heater), 151b, 152b, 251b, 252b, 351b, 352b ... Peripheral heater (peripheral heater), 152 252, 352 ... heat pressure head, 153,253,353 ... pressure mechanism

Claims (7)

A solar cell module sealing method for sealing a solar cell module by interposing a sealing resin between a pair of plate members,
A laminating step of laminating the pair of plate members and the sealing resin to form a laminate;
A first heating and pressing step of heating and pressurizing the laminate at a temperature lower than a temperature at which the sealing resin melts;
The sealing resin is heated and pressurized at a temperature higher than that of the first heating and pressurizing step, and the temperature is raised from a central portion of the laminate to heat the sealing resin. A second heating and pressing step for melting
The sealing method of the solar cell module which has this.   2. The solar cell module sealing method according to claim 1, wherein the first heating and pressing step heats and pressurizes the stacked body at a temperature equal to or lower than a temperature at which the sealing resin softens.   The solar cell module sealing method according to claim 1 or 2, wherein a preheating step of warming the stacked body is performed before the first heating and pressurizing step. A solar cell module sealing device that seals a solar cell module by interposing a sealing resin between a pair of plate members,
A first heating and pressing unit that heats and pressurizes the laminate in which the pair of plate materials and the sealing resin are stacked at a temperature lower than the temperature at which the sealing resin melts;
A second heat and pressure unit that heats and pressurizes the laminate at a temperature higher than that of the first heat and pressure unit, raises the temperature from the center of the laminate, and melts the sealing resin;
A solar cell module sealing device comprising: The second heating and pressing unit includes:
A central heater for heating the central part of the laminate;
A peripheral heater for heating the peripheral portion of the laminate, and
The solar cell module sealing device according to claim 4, wherein a temperature of the central heater is higher than a temperature of the peripheral heater. The second heating and pressing unit includes:
A heating stage on which the laminate is placed;
A heating and pressing head opposed to the heating stage and supported by the pressing mechanism so as to be movable up and down,
The sun according to claim 4 or 5, wherein a central portion of at least one of the heating stage and the heating / pressurizing head bulges toward the heating stage or the heating / pressurizing head. Battery module sealing device. The heat conductivity of the location which heats the center part of the said laminated body is made higher than the thermal conductivity of the location where the said 2nd heating-pressing unit heats the peripheral part of the said laminated body. The sealing apparatus of the solar cell module in any one of.

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