JP2012216809A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module which has sufficient impact resistance while achieving weight reduction, and is capable of preventing breakage of a photovoltaic element due to tensile stress.SOLUTION: The solar cell module has a solar cell disposed between a front surface protective layer and a rear surface protective layer. The front surface protective layer is a resin (A) which satisfies an elastic modulus of 1 GPa or more and a total light transmittance of 80% or higher. A thickness of the resin (A) is 1 mm or greater. The rear surface protective layer is a resin (B) which satisfies an elastic modulus of 1 GPa or more. The total thickness of the resin (A) and the resin (B) is 3 mm or greater.

Description

  The present invention relates to a solar cell module that is lightweight and has excellent impact resistance. The solar cell module of the present invention is suitable for a vehicle solar cell panel.

  Conventionally, a solar cell module capable of protecting against external pressure, an inexpensive and lightweight solar cell module in which a power generation element is sealed between two polycarbonate plates, and a solar cell module for thinning are known. (Patent Document 1, Patent Document 2, Patent Document 3). On the other hand, development of a vehicle solar cell panel to be mounted on a vehicle has also been made (for example, Patent Document 4).

  However, none of them are sufficient for mounting on a vehicle, a solar cell module that has sufficient impact resistance while realizing weight reduction, and can further prevent the photovoltaic element from being damaged by tensile stress. Development was desired.

JP-A-7-169984 JP 2005-113077 A JP 2007-242777 A JP 2010-21499

  The subject of this invention is providing the solar cell module which has sufficient impact resistance, implement | achieving weight reduction, and can prevent further destruction of the photovoltaic element by tensile stress.

As a result of intensive studies to solve the above problems, the present inventor has found a solar cell module suitable for being mounted on a vehicle by defining the material and thickness of the front surface protective layer and the rear surface protective layer within a specific range. As a result, the present invention has been found.
That is, the present invention has the following configuration.
(1) A solar cell module in which solar cells are arranged between a surface protective layer and a back surface protective layer, wherein the surface protective layer satisfies an elastic modulus of 1 GPa or more and a total light transmittance of 80% or more (A The thickness of the resin (A) is 1 mm or more, the back protective layer is a resin (B) satisfying an elastic modulus of 1 GPa or more, and the thickness of the resin (A) and the resin (B). The solar cell module, wherein the total is 3 mm or more.
(2) The solar cell module according to (1) above, wherein the thickness of the resin (A) exceeds 1 mm.
(3) The solar cell module according to (1), wherein the thickness of the resin (B) is equal to or greater than the thickness of the resin (A).
(4) The solar cell module according to any one of (1) to (3) above, wherein one or more surface protective sheets are disposed outside the surface protective layer.
(5) The solar cell module according to any one of (1) to (4) above, wherein a total thickness of the resin (A) and the resin (B) is less than 6 mm.
(6) The solar cell module according to any one of (1) to (5) above, further having a weather-resistant protective layer outside the surface protective layer or the surface protective sheet.
(7) The solar cell module according to any one of (1) to (6) above, further including a reinforcing layer between the back surface protective layer and the solar battery cell.
(8) A vehicle solar cell panel using the solar cell module according to any one of (1) to (7).

  ADVANTAGE OF THE INVENTION According to this invention, although it is thin and lightweight, the solar cell module which has the impact resistance which suppresses destruction of a photovoltaic cell can be implement | achieved. Since the solar cell module itself of the present invention has a function of suppressing deflection and vibration, it is easy to mount, thereby reducing the mounting cost.

It is explanatory drawing which shows the one aspect | mode of the solar cell module of this invention. It is explanatory drawing which shows the one aspect | mode of the solar cell module of this invention. It is a solar cell device equipped with the solar cell module of the present invention. It is explanatory drawing which shows the one aspect | mode of the solar cell module of this invention. It is explanatory drawing which shows the one aspect | mode of the solar cell module of this invention.

The best mode for carrying out the present invention will be specifically described below.
In the solar cell module of the present invention, a photovoltaic element is disposed between the front surface protective layer and the rear surface protective layer, and further, a gas barrier layer, an ultraviolet cut layer, a weather resistant protective layer, an abrasion resistant layer, and an antifouling layer. Other known constituent members may be provided.
As the surface protective layer, a resin (hereinafter sometimes referred to as “resin (A)”) is used.
The elastic modulus of the resin (A) is 1 GPa or more. Preferably it is 2 GPa or more, More preferably, it is 3 GPa or more. Although an upper limit is not specifically limited, Usually, it is 20 GPa or less, and 10 GPa or less is preferable. The elastic modulus is measured according to, for example, JIS K 7171. If the elastic modulus is less than 1 GPa, the thickness must be increased in order to obtain sufficient impact resistance, and lightness and transparency are deteriorated.

The total light transmittance of the resin (A) is 80% or more, preferably 85% or more. Although an upper limit is not specifically limited, Usually, it is 99.9% or less. The measurement method of the total light transmittance is, for example, JIS
According to K 7361-1.
Examples of such a resin include polycarbonate, polymethyl methacrylate, cyclic polyolefin, polystyrene, and polyethylene terephthalate. Preferably, polycarbonate (PC) resin, polymethyl methacrylate (PMMA), etc. are mentioned.

Commercially available products can be used for obtaining these resins. For example, a polycarbonate plate manufactured by Takiron Co., Ltd., Iupilon manufactured by Mitsubishi Engineering Plastics Co., Ltd. is used for PC, Acrylite manufactured by Mitsubishi Rayon Co., Ltd., Sumipex manufactured by Sumitomo Chemical Co., Ltd., and the like.
The thickness of the resin (A) is 1 mm or more. The thickness is preferably more than 1 mm. Further, the thickness of the resin (A) is preferably 1.0 mm or more, preferably a thickness exceeding 1.0 mm, more preferably 1.5 mm or more, and further preferably 2.0 mm or more. Although an upper limit is not specifically limited, Usually, it is 3.0 mm or less, Preferably it is 2.5 mm or less. When the thickness of the resin (A) is less than 1.0 mm, the impact resistance is remarkably lowered. In particular, the evaluation result by the hail test (JIS C 8990) is deteriorated.

As a method of making the resin (A) have a desired thickness, a known plate corresponding to the resin (A) can be used, and a known plate can be produced by a method such as hot pressing. At that time, an adhesive or the like may be used.
By using the resin (A) for the surface protective layer, the impact force during the hail test can be dispersed in the plane direction. Thereby, the stress concentration on the solar battery cell can be reduced and the destruction of the solar battery cell can be suppressed. In addition, hail breakage can be promoted, and the stress on the solar cell can be reduced by the energy dispersion. The magnitude | size in particular of a surface protective layer is not restrict | limited, Usually, it should just be larger than a photovoltaic cell.

A surface protective sheet may be provided on the outer side (surface layer side) of the surface protective layer. In the present invention, it is preferable to provide a surface protective sheet in order to suppress damage and deterioration of the surface protective layer and maintain the total light transmittance. The material constituting the surface protective sheet is preferably a weather-resistant / scratch-resistant film, and a commonly used known material can be used.
Examples of the resin used as the material for the surface protective sheet include ethylene-tetrafluoroethylene copolymer, polymethyl methacrylate (PMMA), silicone, polyethylene terephthalate, and polyamide. Among these, polymethyl methacrylate (PMMA) and ethylene-tetrafluoroethylene copolymer are preferable. Such a surface protective sheet can also be arranged in one or more layers.

  The thickness of the surface protective sheet is not particularly limited, but is usually 10 μm or more, preferably 20 μm or more, and is usually 200 μm or less, preferably 150 μm or less. Since the surface protective sheet is provided on the light receiving surface side of the solar battery cell, it needs to have a property of transmitting light, and its total light transmittance is 80% or more, preferably 85% or more. Although an upper limit is not specifically limited, Usually, it is 99.9% or less. A commercially available surface protective sheet can be used. For example, Acryprene HBS (manufactured by Mitsubishi Rayon Co., Ltd.), Sanduren (manufactured by Kaneka Corporation), Technoloy (manufactured by Sumitomo Chemical Co., Ltd.) and the like can be exemplified.

  An adhesive layer may be provided between the surface protective sheet and the surface protective layer. The material of the adhesive layer is not particularly limited, but usually, for example, ethylene-vinyl acetate copolymer (EVA) resin, polyvinyl butyral (PVB) resin, modified polyethylene resin modified with maleic acid or silane, modified polypropylene resin, epoxy A light-transmitting material such as a system adhesive or a urethane system adhesive is used. The thickness of the adhesive layer is not particularly limited, but a sheet shape of, for example, 300 to 500 μm is preferable.

  In the present invention, a weatherproof protective layer may be further provided on the outer side (surface layer side) of the surface protective layer or the surface protective sheet. By providing a weather-resistant protective layer, weather resistance, impact resistance, scratch resistance and the like can be further improved. Although the material of a weather-resistant protective layer is not specifically limited, Hard coat agents, such as photocurable resin and a thermosetting resin, can be used. After such a hard coat agent is applied, sprayed, etc., the weatherproof protective layer can be laminated on the outside of the surface protective layer or the surface protective sheet by drying, heating, light irradiation, or the like.

  Since the weatherproof protective layer is provided on the light receiving surface side of the solar battery cell, it needs to have a property of transmitting light, and its total light transmittance is 80% or more, preferably 85% or more. Although an upper limit is not specifically limited, Usually, it is 99.9% or less.

Although the thickness of a weather-resistant protective layer is not specifically limited, Usually, it is 1 micrometer or more, Preferably it is 5 micrometers or more, and is 200 micrometers or less normally, Preferably it is 100 micrometers or less.
A commercially available hard coat agent can be used as the hard coat agent used for the weather-resistant protective layer. Examples include Iupimer UV (ultraviolet curable resin: manufactured by Mitsubishi Chemical Corporation) and Ray Queen (manufactured by Mitsubishi Rayon Co., Ltd.).

  A sealing material (hereinafter sometimes referred to as “surface-side filler”) may be interposed between the surface protective layer and the solar battery cell. Moreover, you may interpose a sealing material (henceforth a "back surface side filler") between a back surface protective layer and a photovoltaic cell. As a sealing material, if it is a synthetic resin material which permeate | transmits sunlight, it will not specifically limit, The well-known normally used thing can be used. For example, use ethylene-vinyl acetate copolymer (EVA) resin, polyvinyl butyral (PVB) resin, modified polyethylene resin modified with maleic acid or silane, modified polypropylene resin, epoxy adhesive, urethane adhesive, etc. Can do.

  The solar battery cell used for this invention is not specifically limited, A well-known normally used thing can be used. Examples thereof include crystalline silicon solar cells manufactured by Q-Cells, First Solar, Suntech, and Sharp.

  The back surface protective layer is made of a resin (hereinafter sometimes referred to as “resin B”). The elastic modulus of the resin (B) is 1 GPa or more. Preferably it is 2 GPa or more, More preferably, it is 3 GPa or more. Although an upper limit is not specifically limited, Usually, it is 20 GPa or less, and 10 GPa or less is preferable. If the elastic modulus is less than 1 GPa, the thickness must be increased in order to obtain sufficient impact resistance, and the lightness deteriorates.

Examples of such a resin include polycarbonate (PC) resin, polymethyl methacrylate (PMMA), glass epoxy multilayer material, fiber reinforced plastic (FRP), cyclic polyolefin, polystyrene, polyethylene terephthalate, and the like. Preferably, polycarbonate (PC) resin, polymethyl methacrylate (PMMA), glass epoxy multilayer material, etc. are mentioned.
The material of the resin (B) may be the same as or different from the resin (A). As a combination of the resin (A) and the resin (B), when the resin (A) is a PC resin and the resin (B) is a PC resin, the resin (A) is a PMMA resin and the resin (B) is PMMA. In the case of a resin, it is preferable that the resin (A) is a PC resin and the resin (B) is a PMMA resin, and the resin (A) is a PMMA resin and the resin (B) is a PC resin.

The thickness of the resin (B) is preferably 1 mm or more. The thickness is preferably more than 1 mm. Further, the thickness of the resin (B) is preferably 1.0 mm or more, preferably a thickness exceeding 1.0 mm, more preferably 1.5 mm or more, and further preferably 2.0 mm or more. Although an upper limit is not specifically limited, Usually, it is 3.0 mm or less, Preferably it is 2.5 mm or less. When the thickness of the resin (B) is less than 1.0 mm, the deflection preventing performance by the hard ball drop test is remarkably lowered.
Further, the thickness of the resin (B) is preferably not less than the thickness of the resin (A), more preferably not less than twice the thickness of the resin (A), and more than twice. More preferably, it is 3 times or more.

By using the resin (B) as the back surface protective layer, it is possible to suppress the deflection during the hard ball drop test. Thereby, the distortion amount of a photovoltaic cell can be reduced and destruction of a photovoltaic cell can be suppressed.
Moreover, when the thickness of the resin (B) is less than 1.5 mm, the thickness of the resin (A) exceeds 2 mm in order to reduce the strain amount of the solar battery cell and suppress the destruction of the solar battery cell. Is more preferable, and it is more preferable to exceed 2.0 mm.

The total thickness of the resin (A) and the resin (B) is usually 3 mm or more, preferably 4 mm or more. If it is less than 3 mm, the impact resistance is significantly reduced. Moreover, it is preferable that the sum total of thickness of resin (A) and resin (B) is less than 6 mm, and it is more preferable that it is 5 mm or less. The total thickness of the resin (A) and the resin (B) is preferably 3.0 mm or more, and more preferably 4.0 mm or more. If it is less than 3.0 mm, the impact resistance is significantly lowered. Moreover, it is preferable that the sum total of thickness of resin (A) and resin (B) is less than 6.0 mm, and it is more preferable that it is 5.0 mm or less. If it exceeds 6 mm, sufficient weight reduction cannot be achieved.
The manufacturing method of the solar cell module of the present invention may be a known method. For example, a multilayer sheet including a solar cell, a surface protective layer, a sealing material, a back surface protective layer, and the like is disposed in a vacuum lamination device. A solar cell module can be obtained by heating after evacuation and then cooling after elapse of a certain time. Moreover, the solar cell module of the present invention may further include a gas barrier film, an ultraviolet cut film, or the like.

  In the solar cell module of the present invention, a reinforcing layer can be disposed between the front surface protective layer and the rear surface protective layer. The reinforcing layer increases the strength such as impact resistance of the entire solar cell module, and the solar cells are damaged by the heat shrinkage stress from the surface protective layer and the back surface protective layer generated during cooling after heat lamination, It is a layer which prevents a solar cell from being cracked.

  The number of reinforcing layers included in the solar cell module of the present invention is not particularly limited, but is usually 1 to 2 layers. The reinforcing layer may be between the back surface protective layer and the solar battery cell, or between the front surface protective layer and the solar battery cell, but the reinforcing layer is adjacent to the solar battery cell through a sealing material. Is preferable from the viewpoint of increasing the strength. Moreover, it is preferable to use a sealing material for the upper layer and the lower layer of the reinforcing layer so that the reinforcing layer is sandwiched between the sealing materials.

  In the reinforcing layer used in the present invention, the area of the laminated surface (area of the surface perpendicular to the thickness direction) is preferably equal to or larger than the area of the laminated surface of the solar battery cells. By setting it as such an aspect, the buckling of the current collection line which exists in the peripheral part of a photovoltaic cell can be suppressed. Moreover, it is preferable that it is below the area of the laminated surface of a surface protective layer and a back surface protective layer. This is because the resins are laminated on the peripheral edge of the solar cell module, and it is possible to suppress peeling from the end of the reinforcing layer.

  The material of the reinforcing layer is not particularly limited as long as the material satisfies the above conditions, but preferably a metal (aluminum, iron, stainless steel, copper, brass, galvalume steel plate, etc.) or a metal oxide of these metals, Inorganic oxides (silicon oxide, alumina, zinc oxide, zirconia, forsterite, steatite, cordierite, sialon, zircon, ferrite, mullite, etc.), glass (thin float glass (soda lime glass, non-alkali glass, etc.)) And high-strength plastics (stretched polyethylene terephthalate (stretched PET), stretched polyethylene naphthalate (stretched PEN), polyimide, polyphenylene sulfide, phenol resin, or a glass or carbon fiber reinforced product thereof). Moreover, when arrange | positioning a reinforcement layer in the light-receiving surface side rather than a photoelectric converting layer, it is necessary to use a material with high light transmittance. Examples of such a material include glass such as thin plate glass, stretched PET, stretched PEN, and the like.

The thickness of the reinforcing layer is not particularly limited, but is usually 50 μm or more, preferably 100 μm or more, and more preferably 150 μm or more. On the other hand, the upper limit is usually 1000 μm or less, preferably 500 μm or less.
The elastic modulus of the reinforcing layer is 2 GPa or more, preferably 3 GPa or more, more preferably 4 GPa or more. Although an upper limit is not specifically limited, Usually, it is 100 GPa or less, and 80 GPa or less is preferable.
The linear expansion coefficient of the reinforcing layer is 0.0001 / ° C. or less, preferably 0.00005 / ° C. or less, more preferably 0.00003 / ° C. or less. Although a minimum is not specifically limited, Usually, it is 0.0 / degrees C or more, and 0.000001 / degrees C or more is preferable.

  Hereinafter, although the solar cell module of this invention is demonstrated with reference to drawings, this invention is not necessarily limited only to such an embodiment.

  FIG. 1 shows one embodiment of the solar cell module of the present invention. The solar cell module of FIG. 1 is laminated | stacked in order of the surface protective layer 1, the filler 2, the photovoltaic cell 3, the filler 2, and the back surface protective layer 4 from the sunlight light-receiving surface side. A resin having an elastic modulus of 1 GPa or more and a thickness of 1 mm or more is used as the resin for the surface protective layer 1, a resin having an elastic modulus of 1 GPa or more is used as the back surface protective layer 4, and the total thickness of the surface protective layer 1 and the back surface protective layer 4 is By setting it as 3 mm or more, it can be set as the solar cell module which is lightweight and has the outstanding impact resistance.

  In the solar cell module of FIG. 2, the surface protection sheet 5 is provided outside the surface protection layer 1. Such a surface protective sheet 5 can improve the weather resistance, and can increase the service life of the solar cell that is easily exposed to wind and rain and ultraviolet rays.

  The solar cell module in FIG. 4 has a surface protective sheet 5 on the outside of the surface protective layer 1 and further has a weather resistant protective layer 8 on the outside thereof. The use of the weather-resistant protective layer 8 in addition to the surface protective sheet 5 is preferable when considering installation in a vehicle that is likely to be placed in a harsh environment such as rain and wind.

  In the solar cell module of FIG. 5, the reinforcing layer 9 is stacked between the solar cells 3 and the back surface protective layer 4 so as to be sandwiched between the fillers 2. In FIG. 5, the reinforcing layer 9 is stacked between the solar battery cell 3 and the back surface protective layer 4, but may be stacked between the solar battery cell 3 and the front surface protective layer 1. Such a reinforcing layer 9 can improve the impact resistance of the solar cell module. For example, when installed in a vehicle, damage to the solar battery cell 3 due to vibration or impact can be more reliably reduced.

  The solar cell module of the present invention has impact resistance that suppresses destruction of solar cells despite being thin and lightweight, and also has a function of suppressing deflection and vibration. Can be attached to.

Hereinafter, the present invention will be described in detail based on examples. The present invention is not limited to these examples.
The solar cell device was evaluated by a hail test and a hard ball drop test. Each test method is shown below.
The hail test is a test for examining whether or not the solar battery cell of the solar battery device is protected against an external impact. This test was performed by the method described in JISC8990. That is, a total of 11 ice balls having a diameter of 25 mm collided with different places of the solar cell device at a speed of 23 m / sec.

  About the solar cell apparatus tested by this method, the presence or absence of visual defects, such as peeling and a crack, and the maximum output were evaluated. The maximum output was evaluated by measuring the maximum output before and after the test and examining the rate of decrease after the test with respect to the pre-test.

  The hard ball drop test is a test for examining whether or not the solar cell of the solar cell device is capable of protecting against an external impact. This test was carried out by the simple test method for hail tests described in JISC8938. That is, a hard sphere having a diameter of 38 mm and a mass of 227 g was dropped from the height of 1 m to the center point on the surface of the solar cell device without applying force.

About the solar cell apparatus tested by this method, the presence or absence of visual defects, such as peeling and a crack, and the maximum output were evaluated. The maximum output was evaluated by measuring the maximum output before and after the test and examining the rate of decrease after the test with respect to the pre-test.
The evaluation results of the hail test and the hard ball drop test are shown in Table 1 based on the following evaluation criteria. That is, ◯: When there is no visual defect and the decrease in maximum output is less than 5%, Δ: When there is a visual defect, but the decrease in maximum output is less than 5%, ×: Visually When there is a defect and the maximum output reduction is 5% or more.

Example 1
The solar cell module was manufactured as follows. As the surface protective layer, a polycarbonate (PC) resin (manufactured by Takiron, PC1600) (elasticity 2.25 GPa total light transmittance 89%) having a length of 25 cm, a width of 25 cm, and a thickness of 2.0 mm was used. As the surface-side filler, an ethylene-vinyl acetate copolymer (EVA) resin (F806, F806) having a length of 25 cm, a width of 25 cm, and a thickness of 500 μm was used. As a solar battery cell, a 6-inch crystal silicon element manufactured by Q-Cells was used. As the back side filler, EVA resin (trade name: F806 manufactured by F-RST) having a length of 25 cm, a width of 25 cm, and a thickness of 500 μm was used. As the back surface protective layer, a PC resin (PC1600, manufactured by Takiron Co., Ltd.) having a length of 25 cm, a width of 25 cm, and a thickness of 2.0 mm (elasticity 2.25 GPa total light transmittance 89%) was used.

  A surface protective layer, a front surface side filler, a solar battery cell, a back surface side filler, and a back surface protective layer are laminated as shown in FIG. 1 and placed in a vacuum lamination device (small laminator LN-50X50-S manufactured by NPC). The stage was heated to 150 ° C., and the laminated body was evacuated with the protruding pin lifted and held for 5 minutes. Next, the protruding pin was lowered to bring the laminate into close contact with the stage and held for 15 minutes, and then the laminate was taken out and naturally cooled to obtain a solar cell module.

  The solar cell module thus obtained was attached to an attachment jig as shown in FIG. 3 to create a solar cell device. The solar cell device was subjected to a hail test and a hard ball drop test to evaluate impact resistance. The results are shown in Table 1. For the following examples and comparative examples, the impact resistance was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Example 2
As the surface protective layer, the thickness of the PC resin of Example 1 was changed to 1.5 mm (elastic modulus 2.25 GPa total light transmittance 89%), and as the back surface protective layer, the thickness of the PC resin of Example 1 was changed. A solar cell device was obtained in the same manner as in Example 1 except that the thickness was changed to 1.5 mm (elastic modulus 2.25 GPa total light transmittance 89%).

Example 3
As the surface protective layer, the thickness of the PC resin of Example 1 was changed to 1.0 mm (elastic modulus 2.25 GPa total light transmittance 89%), and as the back surface protective layer, the thickness of the PC resin of Example 1 was changed. A solar cell device was obtained in the same manner as in Example 1 except that the thickness was changed to 3.0 mm (elastic modulus 2.25 GPa total light transmittance 89%).

Example 4
As the surface protective layer, the thickness of the PC resin of Example 1 was changed to 3.0 mm (elastic modulus 2.25 GPa total light transmittance 89%), and as the back surface protective layer, the thickness of the PC resin of Example 1 was changed. A solar cell device was obtained in the same manner as in Example 1 except that the thickness was changed to 1.0 mm (elastic modulus 2.25 GPa total light transmittance 89%).

Example 5
As a surface protective layer, 25 cm in length, 25 cm in width, and thickness in place of the PC resin of Example 1.
A 0 mm polymethyl methacrylate (PMMA) resin (manufactured by Mitsubishi Rayon Co., Ltd., Acrylite (registered trademark) MR) (elasticity 3.2 GPa total light transmittance 88%) was used as the back protective layer, and the PC resin of Example 1 Instead of polymethyl methacrylate (PMMA) resin (Mitsubishi Rayon Co., Ltd., Acrylite (registered trademark) MR) (elastic modulus 3.2 GPa total light transmittance 88%) A solar cell device was obtained in the same manner as in Example 1 except that it was used.

Example 6
As a surface protective layer, a polymethyl methacrylate (PMMA) resin (Acrylite (registered trademark) MR, manufactured by Mitsubishi Rayon Co., Ltd.) having a length of 25 cm, a width of 25 cm, and a thickness of 1.5 mm instead of the PC resin of Example 1 (elastic modulus) 3.2 GPa total light transmittance 88%), and as a back protective layer, a polymethyl methacrylate (PMMA) resin (Mitsubishi Rayon Co., Ltd.) having a length of 25 cm, a width of 25 cm, and a thickness of 1.5 mm instead of the PC resin of Example 1. A solar cell device was obtained in the same manner as in Example 1 except that Acrylite (registered trademark) MR (elasticity: 3.2 GPa total light transmittance: 88%) was used.

Example 7
An EVA resin (trade name: F806 manufactured by F-RST) thickness 500 μm is used for the surface protective layer, and an ethylene-tetrafluoroethylene copolymer (ETFE) sheet (trade name: Asahi) which is a surface protection sheet. A solar cell device was obtained in the same manner as in Example 1 except that 50 μm thickness was adhered as shown in FIG.

Comparative Example 1
As the surface protective layer, the thickness of the PC resin of Example 1 was changed to 1.0 mm (elastic modulus 2.25 GPa total light transmittance 89%), and as the back surface protective layer, the thickness of the PC resin of Example 1 was changed. A solar cell device was obtained in the same manner as in Example 1 except that the thickness was changed to 1.0 mm.

Example 8
As a surface protective layer, a solar cell device was obtained in the same manner as in Example 1 except that the thickness of the PC resin in Example 1 was changed to 1.0 mm (elastic modulus 2.25 GPa total light transmittance 89%).

Example 9
A solar cell device was obtained in the same manner as in Example 1 except that the thickness of the PC resin in Example 1 was changed to 1.0 mm (elastic modulus 2.25 GPa total light transmittance 89%) as the back surface protective layer.

Comparative Example 2
As a surface protective layer, polymethyl methacrylate (PMMA) resin (manufactured by Mitsubishi Rayon Co., Ltd., Acrylite (registered trademark) MR) (elastic modulus) instead of the PC resin of Example 1, having a length of 25 cm, a width of 25 cm, and a thickness of 1.0 mm 3.2 GPa total light transmittance 88%), as a back protective layer, a polymethyl methacrylate (PMMA) resin (Mitsubishi Rayon Co., Ltd.) having a length of 25 cm, a width of 25 cm, and a thickness of 1.0 mm instead of the PC resin of Example 1. A solar cell device was obtained in the same manner as in Example 1 except that Acrylite (registered trademark) MR (elasticity: 3.2 GPa total light transmittance: 88%) was used.

Example 10
Using an EVA resin (trade name: F806 manufactured by F-RST) thickness 500 μm as the surface protective layer, a polymethyl methacrylate (PMMA) resin sheet (trade name: Acryprene HBS010 Mitsubishi Rayon Co., Ltd.) which is a surface protection sheet A solar cell device was obtained in the same manner as in Example 1 except that a thickness of 50 μm (made by company) was adhered as shown in FIG.

Example 11
In Example 10, a weather resistant UV hard coat (trade name: Iupimer UV manufactured by Mitsubishi Chemical Corporation) was applied and dried on the surface protective sheet to form a 10 μm thick weather resistant protective layer as shown in FIG. A solar cell device was obtained in the same manner as in Example 10 except that.

Example 12
As the reinforcing layer, a PET film having a length of 25 cm, a width of 25 cm, and a thickness of 0.1 mm (Diafoil, manufactured by Mitsubishi Plastics, Inc.) (elastic modulus: 4.0 GPa linear expansion coefficient: 2.0 × 10 ⁻⁵ / ° C.) Except that the surface protective layer, the front surface side filler, the solar battery cell, the back surface side filler, the reinforcing layer, the back surface side filler, and the back surface protective layer were laminated in this order as shown in FIG. A battery device was obtained.

  As described above, the solar cell module of the present invention was evaluated by the hail test, and as a result, it was shown that the solar cell module has a high protection capability against external impacts. Moreover, as a result of evaluating the solar cell module of the present invention by a hard ball drop test, it was shown that the solar cell module has a high protection capability against the external impact caused by the tensile stress of the solar cell.

  The present invention relates to a solar cell module that is lightweight and has excellent impact resistance. The solar cell module of the present invention is suitable for a vehicle solar cell panel.

DESCRIPTION OF SYMBOLS 1 Surface protective layer 2 Filler 3 Solar cell 4 Back surface protective layer 5 Surface protective sheet 6 Solar cell module 7 Mounting jig 8 Weatherproof protective layer 9 Reinforcing layer

Claims (8)

A solar cell module in which solar cells are arranged between a surface protective layer and a back surface protective layer, wherein the surface protective layer is a resin (A) satisfying an elastic modulus of 1 GPa or more and a total light transmittance of 80% or more. The thickness of the resin (A) is 1 mm or more, the back protective layer is a resin (B) satisfying an elastic modulus of 1 GPa or more, and the total thickness of the resin (A) and the resin (B) Is a solar cell module characterized by being 3 mm or more. The solar cell module according to claim 1, wherein the thickness of the resin (A) exceeds 1 mm. The solar cell module according to claim 1, wherein the thickness of the resin (B) is equal to or greater than the thickness of the resin (A). The solar cell module according to claim 1, wherein one or more surface protective sheets are arranged outside the surface protective layer. The sum total of the thickness of the said resin (A) and the said resin (B) is less than 6 mm, The solar cell module in any one of Claims 1-4 characterized by the above-mentioned. The solar cell module according to any one of claims 1 to 5, further comprising a weatherproof protective layer outside the surface protective layer or the surface protective sheet. The solar cell module according to claim 1, further comprising a reinforcing layer between the back surface protective layer and the solar battery cell. The solar cell panel for vehicles using the solar cell module in any one of Claims 1-7.

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