JP2012038778A - Solar cell module and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module which suppresses misalignment of cell strings in a direction that reduces space between the cell strings.SOLUTION: In a solar cell module, two or more cell strings 7, each of which includes electrically connected multiple solar cells 3, are laminated with a sealing material. The solar cell module has an insulation resin film 8 which is attached to the solar cells 3 with a resin tape 9 so as to span the two adjacent cell strings 7 and forms a bridge between the solar cells 3.

Description

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

  A solar cell module used for solar power generation is manufactured using a cell string in which a plurality of solar cells are arranged and connected by a wiring material (tab). Generally, a solar cell module is provided with an EVA (ethylene-vinyl acetate copolymer) layer as a sealing material on a resin sheet layer as a weather-resistant substrate, and a cell string is installed thereon, The cell string is covered with an EVA layer, and a glass layer as a light-transmitting substrate is provided on the EVA layer. This laminated structure is thermocompression bonded by laminating, and the cell string is sealed by the EVA layer between the glass layer and the resin sheet layer.

  When laminating, which is one of the solar cell module manufacturing processes, the cell string interval is widened or narrowed due to the shrinkage / extension of EVA caused by temperature change or the like. For this reason, the problem that a cell string shifts | deviates from a predetermined position generate | occur | produces. The deviation of the cell string not only impairs the design of the solar cell module, but also causes stress to concentrate on the tabs that connect the cells to cause tab disconnection.

  As a countermeasure for this problem, a method of fixing cell strings with a resin tape or the like is known.

  In addition, a method of preventing the positional deviation of the cell string by providing a positioning protrusion on the sealing material has been proposed (see Patent Document 1).

JP 2005-136076 A

  However, the resin tape used for fixing the cell strings in the above-described prior art exerts a suppressing force when the cell strings are shifted in the direction in which the cell string intervals are widened, but the cell strings are shifted in the direction in which the cell string intervals are narrowed. In some cases, the tape is loosened and the restraining force is not fully exhibited.

  Moreover, providing the positioning convex portion on the sealing material causes a rise in the processing cost of the component. Moreover, since it is necessary to design the sealing material according to the size of the cell, it hinders the reduction of the manufacturing cost due to the common use of parts.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the solar cell module which suppressed the shift | offset | difference of the cell string of the direction where a cell string space | interval narrows, and its manufacturing method.

  In order to solve the above-described problems and achieve the object, the present invention is a solar cell module in which a plurality of cell strings including a plurality of electrically connected solar cells are laminated together with a sealing material, It has the insulating resin film spanned between photovoltaic cells so that it may straddle two adjacent cell strings.

  According to the present invention, it is possible to prevent the positional deviation of the cell string, improve the aesthetics, and prevent the tab disconnection.

FIG. 1 is a diagram illustrating a configuration of a solar cell module according to an embodiment. FIG. 2 is a diagram showing a fixed state of the cell string applied to the solar cell module according to the embodiment. FIG. 3 is a diagram showing the force acting on the cell string by the expansion and contraction of the EVA layer.

  Embodiments of a solar cell module and a manufacturing method thereof according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram showing a configuration of a solar cell module according to an embodiment of the present invention. The solar cell module according to the present embodiment has a configuration using a plurality of cell strings 7 in which a plurality of solar cells 3 are arranged and connected by a wiring material 4. In the solar cell module according to the present embodiment, an EVA layer 5 as a sealing material is provided on a resin sheet layer 6, and a cell string 7 is provided thereon. An EVA layer 2 is provided on the cell string 7, and a glass layer 1 is provided on the EVA layer 2. Each layer constituting the solar cell module is pressure-bonded by a laminating process, and the cell string 7 is sealed by the EVA layers 2 and 5 between the glass layer 1 and the resin sheet layer 6.

  FIG. 2 is a diagram showing a fixed state of the cell string applied to the solar cell module according to the embodiment. An insulating resin film 8 made of polyethylene terephthalate (PET) or polyethylene (PE) is attached to the back surface of some solar cells 3 with a resin tape 9. The insulating resin film 8 is bridged between the solar cells 3 so as to straddle two adjacent cell strings 7. Since the insulating resin film 8 is formed of an insulating resin material, even if the insulating resin film 8 is bridged between the two solar cells 3, the electrical connection state by the wiring member 4 is not affected. The insulating resin film 8 has a thickness that exhibits higher rigidity than the shrinkage force generated in the EVA layers 2 and 5 during lamination. That is, even if a shrinkage force is generated in the EVA layers 2 and 5 during lamination, the insulating resin film 8 is not deformed so as to be loosened.

  At the time of lamination, when a force in the direction in which the cell string interval is widened by the expansion of the EVA layers 2 and 5 (direction of arrow A in FIG. 3) acts on the cell string 7, tension acts on the insulating resin film 8 and the resin tape 9, The movement of the cell string 7 is suppressed.

  When a force in a direction (arrow B direction in FIG. 3) in which the cell string interval is narrowed acts on the cell string 7 during lamination, the movement of the cell string 7 is suppressed by the rigidity of the insulating resin film 8. The

  In general, if the thickness of the insulating resin film 8 is 100 μm or more, the rigidity of the insulating resin film 8 is higher than the shrinkage force generated in the EVA layers 2 and 5 during lamination, and is generated in the EVA layers 2 and 5. The insulating resin film 8 can be prevented from loosening due to the contracted force.

  In the vicinity of the center of the cell string 7, the displacement of the cell string 7 is most likely to occur. Therefore, if the insulating resin film 8 is installed on the solar cell 3 near the center of the cell string 7, the effect of preventing the displacement of the cell string 7 is achieved. Can be increased.

  The insulating resin film 8 is preferably formed using a colorless and transparent resin. By using a colorless and transparent resin as the material of the insulating resin film 8, the difference in appearance between the portion where the insulating resin film 8 is bridged and the portion where it is not bridged is reduced, and the appearance of the solar cell module is improved. Can be achieved.

  The insulating resin film 8 is preferably formed using a weather-resistant resin (such as weather-resistant PET). By using a weather resistant resin as the material of the insulating resin film 8, yellowing due to the influence of ultraviolet rays contained in sunlight can be suppressed, and deterioration of the appearance of the solar cell module can be prevented.

  Further, by sticking the EVA film to the surface of the insulating resin film 8 (solar cell side), the adhesion between the insulating resin film 8 and the EVA layer 2 is increased during lamination, and the insulating resin film 8 and the EVA layer 2 are increased. Air bubbles can be prevented from entering between. That is, the insulating resin film 8 with the EVA film bonded to one surface is spanned between the solar cells 3 so that the EVA film faces the light-receiving surface side of the solar cells 3, thereby insulating during lamination. Air bubbles can be prevented from entering between the resin film 8 and the EVA layer 2. Thereby, deterioration of the external appearance of a solar cell module can be prevented.

  In the above description, a configuration in which one insulating resin film 8 is bridged over a pair of cell strings is taken as an example, but two or more insulating resin films 8 may be bridged over a pair of cell strings. Increasing the number of insulating resin films 8 spanned between the cell strings 7 increases the effect of preventing the displacement of the cell strings 7 but increases the manufacturing cost. It is preferable to determine the number of installations. When the plurality of insulating resin films 8 are bridged between the cell strings 7, the effect of preventing the positional deviation of the cell strings 7 can be enhanced by bridging the insulating resin films 8 at equal intervals.

  In the solar cell module according to the present embodiment, the position of the cell string is prevented from being shifted in the direction in which the cell string interval is narrowed during lamination. Therefore, the appearance of the solar cell module is not impaired, and the tab connecting the solar cells is not broken.

  As described above, the solar cell module and the method for manufacturing the solar cell module according to the present invention are useful in terms of enhancing the aesthetics of the solar cell module and preventing deterioration, and are suitable for application to a photovoltaic power generation system with excellent design. ing.

1 Glass layer (translucent substrate)
2, 5 EVA layer 3 Solar cell 4 Wiring material 6 Resin sheet layer (weather-resistant substrate)
7 Cell string 8 Insulating resin film 9 Resin tape

Claims (7)

A solar cell module in which a plurality of cell strings including a plurality of electrically connected solar cells are laminated together with a sealing material,
A solar cell module comprising an insulating resin film spanned between the solar cells so as to straddle two adjacent cell strings.   The solar cell module according to claim 1, wherein the insulating resin film has a rigidity higher than a shrinkage force generated in the sealing material during the laminating.   The solar cell module according to claim 1, wherein the insulating resin film is colorless and transparent.   The solar cell module according to claim 1, wherein the insulating resin film has weather resistance. A method for manufacturing a solar cell module in which a plurality of cell strings including a plurality of electrically connected solar cells are laminated together with a sealing material,
A first step of spanning an insulating resin film between the solar cells so as to straddle two adjacent cell strings;
And a second step of performing the lamination by using the cell string in which the insulating film is bridged between the solar cells.   The method for manufacturing a solar cell module according to claim 5, wherein the insulating resin film has rigidity higher than a shrinkage force generated in the sealing material during the lamination.   In the first step, a film of the same material as the sealing material is provided on one surface of the insulating resin film, and the insulating resin film faces the light receiving surface of the solar battery cell. Thus, the solar cell module manufacturing method according to claim 5, wherein the solar cell module is spanned between the solar cells.

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