JP2013030650A - Manufacturing method of solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a solar cell module which prevents poor appearance of a rear surface side coloration sealing film.SOLUTION: A manufacturing method of a solar cell module includes a process where a light receiving surface side transparent protection member 11, a light receiving surface side sealing film 13A, a power generation element 14, a rear surface side coloration sealing film 13B, and a rear surface side protection member 12 are laminated in the order to obtain a laminated body 10 and the laminated body 10 is heated and pressurized to be integrated. In the manufacturing method of the solar cell module, pressurization starts after the rear surface side coloration sealing film 13B is heated to a range of 70 to 110°C.

Description

  The present invention relates to a method for manufacturing a solar cell module, and more particularly to a method for manufacturing a solar cell module capable of preventing appearance defects of a colored sealing film on the back side.

  In recent years, solar cells that directly convert sunlight into electrical energy have been widely used and further developed in terms of effective use of resources and prevention of environmental pollution.

  Generally, a solar cell is configured such that a power generation element is sealed between a light-receiving surface side transparent protective member and a back surface-side protective member (back cover) by a light-receiving surface side sealing film and a back surface side sealing film. ing. A conventional solar cell is used as a solar cell module by connecting a plurality of power generating elements in order to obtain a high electric output. Therefore, an insulating sealing film is used to ensure insulation between the power generating elements.

  As a sealing film used on the light receiving surface side and the back surface side, an ethylene-vinyl acetate copolymer (EVA) film or the like is widely used. Further, in order to improve the film strength and durability, the crosslinking density is improved by using a crosslinking agent such as an organic peroxide in addition to EVA for the sealing film.

  In the solar cell, it is strongly desired from the viewpoint of improving power generation efficiency that light incident on the solar cell can be taken into the solar cell as efficiently as possible. Therefore, it is desirable that the light-receiving surface side sealing film does not absorb or reflect incident sunlight and transmits most of sunlight. Therefore, a sealing film excellent in transparency is used as the light-receiving surface side sealing film (for example, Patent Document 1).

On the other hand, as the back surface side sealing film, an EVA film colored with a colorant such as titanium dioxide (TiO ₂ ) is used (for example, Patent Document 2). According to the colored back surface side sealing film in this way, power is generated by reflecting light at the interface between the light receiving surface side sealing film and the back surface side sealing film inside the solar cell, or by irregular reflection of light by the colorant itself. Light incident between the elements can be diffusely reflected and incident again on the back side. Thereby, the utilization efficiency of the light incident on the solar cell is increased, and the power generation efficiency of the solar cell can be improved.

  To produce a solar cell module, as shown in FIG. 1, a plurality of power generation elements 14 electrically connected by a light-receiving surface side transparent protective member 11, a light-receiving surface-side sealing film 13 </ b> A, a connection tab 15, and the back surface side The sealing film 13B and the back surface side protection member 12 (back cover) are laminated in this order, and the obtained laminated body 10 is heated and pressurized to crosslink and cure the light receiving surface side sealing film and the back surface side sealing film. And each member is bonded and integrated.

  Bonding and integration of each member of the laminate 10 is generally performed using a vacuum laminator. As the vacuum laminator, for example, as shown in FIG. 2, a double vacuum chamber type vacuum laminator 100 including an upper chamber 102 having a diaphragm 103 and a lower chamber 101 provided with a mounting table 105 is used. . Adhesive integration is performed by placing the laminate 10 on the mounting table 105 so that the light-receiving surface side transparent protective member 11 and the mounting table 105 are in contact with each other, and then placing the upper chamber 102 and the lower chamber 101 in a vacuum state. The laminate 10 is heated by a heater (not shown) built in 105, and the upper surface of the laminate 10 is pressed by the diaphragm 103 with the upper chamber 102 at a pressure higher than atmospheric pressure.

JP 2008-053379 A Japanese Patent Laid-Open No. 06-177412

  However, a wrinkled or crater-like appearance defect may occur in the colored sealing film on the back side of the solar cell module that is bonded and integrated. Since the back side colored sealing film can be visually recognized from the gap between the power generation elements or the like, if the appearance defect occurs in the back side colored sealing film, the appearance of the entire solar cell module may be affected.

  Then, the objective of this invention is providing the manufacturing method of the solar cell module which can prevent appearance defects, such as a wrinkle of a back surface side colored sealing film and a crater shape.

  The purpose is to obtain a laminated body by laminating a light-receiving surface side transparent protective member, a light-receiving surface side sealing film, a power generation element, a back surface side colored sealing film, and a back surface side protective member in this order, and heat the laminated body In the method for manufacturing a solar cell module having a step of integrating by pressurization, the pressurization is started after heating the back side colored sealing film to a range of 70 to 110 ° C. This is achieved by the battery module manufacturing method.

  The sealing film is melted by heating and then cured by cooling. However, when the back side colored sealing film reaches an excessively high temperature at the start of pressurization, the cured back side colored sealing film has wrinkles and craters. On the other hand, the present inventors have found that when the temperature at the start of pressurization is low, the sealing performance by the sealing film cannot be sufficiently obtained. That is, by setting the temperature at the start of pressurization of the colored sealing film on the back side within the above range, it is possible to prevent the appearance of wrinkles and craters and to obtain a solar cell module having a good appearance. It becomes.

Preferred embodiments of the present invention are as follows.
(1) The thickness of the light-receiving surface side sealing film and the back surface side colored sealing film is 0.05 to 2 mm.
(2) The pressurization is performed at a pressure in the range of 1.0 × 10 ³ Pa to 5.0 × 10 ⁷ Pa.
(3) The light-receiving surface side sealing film and the back surface side colored sealing film contain an ethylene-vinyl acetate copolymer and a crosslinking agent.
(4) The vinyl acetate content of the ethylene-vinyl acetate copolymer is 20 to 35% by mass.
(5) The melt flow rate of the ethylene-vinyl acetate copolymer is 35 g / 10 min or less as measured according to JIS K 7210 under the conditions of 190 ° C. and a load of 21.18 N.
(6) The back side colored sealing film contains a colorant, and the colorant is selected from the group consisting of titanium dioxide, calcium carbonate, ultramarine, and carbon black.

  According to the manufacturing method of the solar cell module of the present invention, it is possible to prevent the appearance defect of the back side colored sealing film. Therefore, a solar cell module having a good appearance can be obtained.

It is a schematic sectional drawing of a common solar cell module. It is a schematic sectional drawing which shows a general vacuum laminator.

  As shown in FIG. 1, the manufacturing method of the solar cell module of the present invention includes a light receiving surface side transparent protective member 11, a light receiving surface side sealing film 13A, a power generation element 14, a back surface side colored sealing film 13B, and a back surface side protective member. The laminate 10 is obtained by laminating 12 in this order, and the laminate 10 is integrated by heating and pressing. A plurality of power generation elements 14 are usually provided and are electrically connected to each other by connection tabs 15 made of a conductive material such as copper foil. In the present invention, the light receiving surface side (front surface side) with respect to the power generating element is referred to as “light receiving surface side”, and the surface opposite to the light receiving surface of the power generating element is referred to as “back surface side”.

  In this invention, in a heating and pressurization process, pressurization of a laminated body is started in the state in which the temperature of a back surface side colored sealing film exists in the range of 70-110 degreeC. When pressurization is started at a temperature lower than 70 ° C., the power generating element may break, and when pressurization is started at a temperature higher than 110 ° C., wrinkles or crater-like appearance defects may occur in the back side colored sealing film. is there.

  Hereinafter, each member of the solar cell module will be described.

[Receiving surface side sealing film and back surface side colored sealing film]
It is preferable to use what was produced using the ethylene-vinyl acetate copolymer for the light-receiving surface side sealing film and the back surface side colored sealing film. Thereby, the sealing film which is inexpensive and excellent in insulation and flexibility can be formed.

  The content of vinyl acetate in the ethylene-vinyl acetate copolymer is preferably 20 to 35% by mass, more preferably 22 to 30% by mass, and particularly preferably 24 to 28% by mass with respect to the ethylene-vinyl acetate copolymer. . When the content of vinyl acetate is less than 20% by mass, the fluidity of the composition for sealing film is lowered, and the workability of the sealing film for solar cell may be lowered, and when it exceeds 35% by mass. Further, carboxylic acid, alcohol, amine and the like are generated, and foaming may easily occur at the interface with the member in contact with the sealing film.

  In addition to the ethylene-vinyl acetate copolymer, the light-receiving surface side sealing film and the back surface side colored sealing film are made of polyvinyl acetal resin (for example, polyvinyl formal, polyvinyl butyral (PVB resin), modified PVB), vinyl chloride. A resin may be used as a secondary. In that case, PVB is particularly preferable.

  As the ethylene-vinyl acetate copolymer, it is preferable to use a copolymer having a melt flow rate defined by JIS K7210 of 35 g / 10 min or less, particularly 3-6 g / 10 min. According to the light-receiving surface side sealing film and the back surface side colored sealing film using the ethylene-vinyl acetate copolymer having such a melt flow rate, during the heating and pressurization in the sealing process at the time of solar cell production, It is possible to suppress the sealing film from melting and being displaced and protruding from the end portion of the substrate. In the present invention, the value of the melt flow rate (MFR) is measured based on conditions of 190 ° C. and a load of 21.18 N according to JIS K7210.

  In this invention, it is preferable that a light-receiving surface side sealing film and a back surface side coloring sealing film contain the crosslinking agent for forming the crosslinked structure of an ethylene-vinyl acetate copolymer. As the crosslinking agent, an organic peroxide or a photopolymerization initiator is preferably used. Among these, it is preferable to use an organic peroxide because a sealing film with improved temperature dependency of adhesive strength, moisture resistance, and penetration resistance can be obtained.

  Any organic peroxide may be used as long as it decomposes at a temperature of 100 ° C. or higher and generates radicals. The organic peroxide is generally selected in consideration of the film formation temperature, the adjustment conditions of the composition, the curing temperature, the heat resistance of the adherend, and the storage stability. In particular, those having a decomposition temperature of 70 hours or more with a half-life of 10 hours are preferred.

  Examples of the organic peroxide include, from the viewpoint of resin processing temperature and storage stability, for example, benzoyl peroxide curing agent, tert-hexyl peroxypivalate, tert-butyl peroxypivalate, 3, 5, 5- Trimethylhexanoyl peroxide, di-n-octanoyl peroxide, lauroyl peroxide, stearoyl peroxide, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, succinic acid peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane, 1-cyclohexyl-1-methylethyl Peroxy-2-ethylhexanoate, tert-hexyl par Xyl-2-ethylhexanoate, 4-methylbenzoyl peroxide, tert-butylperoxy-2-ethylhexanoate, m-toluoyl + benzoyl peroxide, benzoyl peroxide, 1,1-bis (tert-butyl Peroxy) -2-methylcyclohexanate, 1,1-bis (tert-hexylperoxy) -3,3,5-trimethylcyclohexanate, 1,1-bis (tert-hexylperoxy) cyclohexanate 1,1-bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (tert-butylperoxy) cyclohexane, 2,2-bis (4,4-di-tert) -Butylperoxycyclohexyl) propane, 1,1-bis (tert-butyl) -Oxy) cyclododecane, tert-hexylperoxyisopropyl monocarbonate, tert-butylperoxymaleic acid, tert-butylperoxy-3,3,5-trimethylhexane, tert-butylperoxylaurate, 2,5- Dimethyl-2,5-di (methylbenzoylperoxy) hexane, tert-butylperoxyisopropyl monocarbonate, tert-butylperoxy-2-ethylhexyl monocarbonate, tert-hexylperoxybenzoate, 2,5-di-methyl -2,5-di (benzoylperoxy) hexane, and the like.

  As the benzoyl peroxide-based curing agent, any can be used as long as it decomposes at a temperature of 70 ° C. or higher to generate radicals, and those having a decomposition temperature of 50 hours or higher with a half-life of 10 hours are preferable, It can be appropriately selected in consideration of preparation conditions, film formation temperature, curing (bonding) temperature, heat resistance of the adherend, and storage stability. Usable benzoyl peroxide curing agents include, for example, benzoyl peroxide, 2,5-dimethylhexyl-2,5-bisperoxybenzoate, p-chlorobenzoyl peroxide, m-toluoyl peroxide, 2, Examples include 4-dichlorobenzoyl peroxide and t-butyl peroxybenzoate. The benzoyl peroxide curing agent may be used alone or in combination of two or more.

  As the organic peroxide, 2,5-dimethyl-2,5di (tert-butylperoxy) hexane and 1,1-bis (tert-hexylperoxy) -3,3,5-trimethylcyclohexane are particularly preferable. . Thereby, the sealing film for solar cells which has the outstanding insulating property is obtained.

  The content of the organic peroxide is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. If the content of the organic peroxide is small, the insulating properties of the resulting sealing film may be lowered, and if it is increased, the compatibility with the copolymer may be deteriorated.

  As the photopolymerization initiator, any known photopolymerization initiator can be used, but a photopolymerization initiator having good storage stability after blending is desirable. Examples of such a photopolymerization initiator include 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, and 2-methyl-1- (4- (methylthio) phenyl). Acetophenones such as 2-morpholinopropane-1, benzoins such as benzyldimethylketal, benzophenones such as benzophenone, 4-phenylbenzophenone and hydroxybenzophenone, thioxanthones such as isopropylthioxanthone and 2-4-diethylthioxanthone, As other special ones, methylphenylglyoxylate can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. These photopolymerization initiators may contain one or two or more kinds of known and commonly used photopolymerization accelerators such as benzoic acid-based or tertiary amine-based compounds such as 4-dimethylaminobenzoic acid as required. Can be mixed and used. Moreover, it can be used individually by 1 type of only a photoinitiator, or 2 or more types of mixture.

  The content of the photopolymerization initiator is preferably 0.5 to 5.0 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer.

  The light-receiving surface side sealing film and the back surface side colored sealing film may further contain a crosslinking aid as required. The said crosslinking adjuvant can improve the gel fraction of an ethylene-vinyl acetate copolymer, and can improve the adhesiveness and durability of a sealing film.

  The content of the crosslinking aid is generally 10 parts by mass or less, preferably 0.1 to 5 parts by mass, more preferably 0.1 to 2.5 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer. Used in the department. Thereby, the sealing film excellent in adhesiveness is obtained.

  Examples of the crosslinking aid (compound having a radical polymerizable group as a functional group) include trifunctional crosslinking aids such as triallyl cyanurate and triallyl isocyanurate, and (meth) acrylic esters (eg, NK ester) ) Monofunctional or bifunctional crosslinking aids. Of these, triallyl cyanurate and triallyl isocyanurate are preferable, and triallyl isocyanurate is particularly preferable.

  It is preferable that the light-receiving surface side sealing film and the back surface side colored sealing film have excellent adhesive strength in consideration of the sealing performance inside the solar cell. Therefore, an adhesion improver may be further included. As the adhesion improver, a silane coupling agent can be used. Thereby, it becomes possible to form the sealing film for solar cells which has the outstanding adhesive force. Examples of the silane coupling agent include γ-chloropropylmethoxysilane, vinylethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, and γ-glycidoxypropyltrimethoxy. Silane, γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β Mention may be made of-(aminoethyl) -γ-aminopropyltrimethoxysilane. These silane coupling agents may be used alone or in combination of two or more. Of these, γ-methacryloxypropyltrimethoxysilane is particularly preferred.

  The content of the silane coupling agent is 5 parts by mass or less, preferably 0.1 to 2 parts by mass with respect to 100 parts by mass of the ethylene-vinyl acetate copolymer.

  The back side colored sealing film used in the present invention contains a colorant. As the colorant, white colorant with titanium white (titanium dioxide), calcium carbonate, etc .; blue colorant with ultramarine, etc .; black colorant with carbon black, etc .; milky white colorant with glass beads, light diffusing agent, etc. can do. Preferably, a white colorant based on titanium white can be used.

  The colorant is preferably contained in an amount of 2 to 10 parts by weight, more preferably 3 to 6 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer contained in the back side colored sealing film.

  The light-receiving surface side sealing film and the back surface side colored sealing film are used as necessary for improving or adjusting various physical properties (mechanical strength, optical characteristics, heat resistance, light resistance, crosslinking speed, etc.) of the film. , Various additives such as a plasticizer, an acryloxy group-containing compound, a methacryloxy group-containing compound and / or an epoxy group-containing compound, an ultraviolet absorber, a light stabilizer and an anti-aging agent may be included.

  What is necessary is just to perform according to a well-known method in order to form a light-receiving surface side sealing film and a back surface side coloring sealing film. For example, the composition containing each of the above-described components can be produced by a method of obtaining a sheet-like material by molding by ordinary extrusion molding, calendar molding (calendering) or the like. Alternatively, a sheet-like material can be obtained by dissolving the composition in a solvent and coating the solution on a suitable support with a suitable coating machine (coater) and drying to form a coating film. The heating temperature during film formation is preferably a temperature at which the crosslinking agent does not react or hardly reacts. For example, it is preferably 50 to 90 ° C, particularly 40 to 80 ° C. The thickness of the light-receiving surface side sealing film and the back side colored sealing film is not particularly limited, but is 0.05 to 2 mm, preferably 0.3 to 1.0 mm.

[Light-receiving side transparent protective member]
As the light-receiving surface side transparent protective member used in the present invention, a glass substrate such as silicate glass can be used. The thickness of the light-receiving surface side transparent protective member is generally 0.1 to 10 mm, and preferably 0.3 to 5 mm. In general, the light-receiving surface side transparent protective member may be chemically or thermally strengthened.

[Back side protection member]
The back side protective member used in the present invention is preferably a plastic film such as polyethylene terephthalate (PET) or polyamide. In addition, in consideration of heat resistance and moist heat resistance, a film obtained by laminating a fluorinated polyethylene film or a fluorinated polyethylene film / Al / fluorinated polyethylene film in this order, or a polyvinyl fluoride resin film (trade name: Tedlar) / PET / A film in which polyvinyl fluoride resin films are laminated in this order may be used.

[Power generation element]
The power generating element used in the solar cell module performs photoelectric conversion, and a conventionally known semiconductor substrate is used. As the semiconductor substrate, an optical semiconductor element made of single crystal silicon, polycrystalline silicon, or amorphous silicon is used. Specifically, amorphous silicon a-Si, hydrogenated amorphous silicon a-Si: H, hydrogenated amorphous silicon carbide a-SiC: H, amorphous silicon nitride, etc. Amorphous or microcrystalline amorphous silicon semiconductors composed of alloys with other elements such as carbon, germanium, tin, etc. are pin-type, nip-type, ni-type, pn-type, MIS-type, heterojunction-type, homojunction A semiconductor layer configured as a mold, a Schottky barrier type, or a combination of these is used. In addition, the optical semiconductor layer may be CdS-based, GaAs-based, InP-based, or the like.

  What is necessary is just to perform according to a conventionally well-known method when incorporating a power generation element into a solar cell module. For example, an inner lead such as copper foil applied by solder plating is connected to the electrode of the power generation element, and the power generation element is connected in series and parallel with the inner lead so that a predetermined electrical output can be taken out from the solar cell module. To do.

[Pressure heating process]
Hereinafter, the pressurization heating process in the manufacturing method of the solar cell module of this invention is demonstrated.

  In the method of the present invention, the above-mentioned laminate is pressurized while being heated. The method of heating and pressurizing the laminate is not particularly limited, but for example, it is preferable to use a vacuum laminator having an inflatable diaphragm, particularly a vacuum laminator of the double vacuum chamber system shown in FIG.

  A vacuum laminator 100 shown in FIG. 2 includes an upper chamber 102 having a diaphragm 103 and a lower chamber 101 having a mounting table 105 for mounting the stacked body 10. In the vacuum laminator 100, the laminated body 10 is pressurized by the diaphragm 103 after evacuating the upper chamber 102 and the lower chamber 101. The evacuation in the upper chamber 102 and the lower chamber 101 is performed by dividing the lower chamber vacuum pump 107 connected to the lower chamber exhaust port 106 and the upper chamber vacuum pump 109 connected to the upper chamber exhaust port 108. Is done.

  In order to bond and integrate the laminate 10 using such a vacuum laminator, first, the light receiving surface side transparent protective member 11, the light receiving surface side sealing film 13A, the power generation element 14, the back surface side colored sealing film 13B, And the laminated body 10 obtained by laminating | stacking the back surface side protection member 12 in this order is mounted on the mounting base 105 so that the light-receiving surface side transparent protection member 11 may become a lower side. Next, the upper chamber 102 and the lower chamber 101 are depressurized and vacuumed by the upper chamber vacuum pump 109 and the lower chamber vacuum pump 107, respectively.

  In order to evacuate the upper chamber 102 and the lower chamber 101, it is preferable to reduce the pressure in the upper chamber 102 and the lower chamber 101 to 50 to 150 Pa, particularly 50 to 100 Pa, respectively. The vacuum time is, for example, 0.1 to 10 minutes, preferably 4 to 7 minutes.

  And it heats, setting each chamber to vacuum. Under the present circumstances, it heats so that the temperature of the back surface side colored sealing film at the time of starting pressurization of a laminated body may be set to 70-110 degreeC, Preferably it is 70-90 degreeC. When pressurization is started at a temperature lower than 70 ° C., the power generating element may break, and when pressurization is started at a temperature higher than 110 ° C., wrinkles or crater-like appearance defects may occur. In this invention, if the temperature at the time of the pressurization start of a back surface side colored sealing film is the said range, a heating method will not be specifically limited.

  As a heating method, the entire vacuum laminator 100 shown in FIG. 2 is heated in a high-temperature environment such as an oven, and a heating medium such as a heating plate is introduced into the lower chamber 101 of the vacuum laminator 100 shown in FIG. The method of heating the body 10 etc. are mentioned. In the latter method, for example, a heating plate is used as the mounting table 105, a heating plate is arranged on the upper side and / or lower side of the mounting table 105, or a heating plate is arranged on the upper side and / or lower side of the stacked body. It is done by doing.

When the upper chamber 102 and the lower chamber 101 are evacuated and the temperature of the back side colored sealing film reaches a temperature within the above range, the inside of the upper chamber 102 is set to 40 to 110 kPa, particularly 60 to 105 kPa. Pressurization of the laminate 10 is started. It is preferable to adjust the degree of expansion of the diaphragm so that the laminate 10 is pressurized at a pressure of 1.0 × 10 ³ Pa to 5.0 × 10 ⁷ Pa, particularly 60 to 105 kPa. The pressurization time is, for example, 5 to 15 minutes.

  The temperature after the start of pressurization may be a temperature that is normally set. For example, heating is performed at 80 to 150 ° C., preferably 90 to 145 ° C. By setting it as the temperature of this range, the crosslinking reaction of an ethylene-vinyl acetate copolymer is performed and each member can be integrated firmly.

  As described above, a solar cell module in which the members are bonded and integrated is obtained. In the present invention, since the temperature at the start of pressurization of the back side colored sealing film is set within a predetermined range, wrinkles and crater-like appearance defects of the back side colored sealing film can be prevented. Become.

  Hereinafter, the present invention will be described in detail with reference to examples.

[Examples 1 to 5, Comparative Examples 1 to 10]
1. Preparation of light-receiving surface side sealing film Materials having the following composition were supplied to a roll mill and kneaded at 70 ° C. The sealing film composition thus obtained was calendered at 70 ° C. to produce a light-receiving surface side sealing film (thickness 0.6 mm).

(Combination)
・ Ethylene-vinyl acetate copolymer (vinyl acetate content: 26 mass%, MFR: 4.3 g / 10 min) 100 mass parts ・ Crosslinking agent (2,5-dimethyl-2,5-di (t-butylperoxy) ) Hexane)
(Perhexa 25B: manufactured by NOF Corporation) 1.3 parts by mass / crosslinking aid (triallyl isocyanurate)
(TAIC: manufactured by Nippon Kasei) 1.5 parts by mass / Silane coupling agent (γ-methacryloxypropyltrimethoxysilane)
(KBM503: manufactured by Shin-Etsu Chemical) 0.5 parts by mass

2. Preparation of back side colored sealing film Materials having the following composition were supplied to a roll mill and kneaded at 70 ° C. The sealing film composition thus obtained was calendered at 70 ° C. to produce a back side colored sealing film (thickness 0.6 mm).

(Combination)
・ Ethylene-vinyl acetate copolymer (vinyl acetate content: 26 mass%, MFR: 4.3 g / 10 min) 100 mass parts ・ Crosslinking agent (2,5-dimethyl-2,5-di (t-butylperoxy) ) Hexane)
(Perhexa 25B: manufactured by NOF Corporation) 1.3 parts by mass / crosslinking aid (triallyl isocyanurate)
(TAIC: manufactured by Nippon Kasei) 1.5 parts by mass / Silane coupling agent (γ-methacryloxypropyltrimethoxysilane)
(KBM503: manufactured by Shin-Etsu Chemical Co., Ltd.) 0.5 parts by mass / colorant (titanium dioxide) 5 parts by mass

3. Production of solar cell module Light-receiving surface side transparent protective member (white plate tempered glass (with emboss), 230 mm × 230 mm × 3.2 mm) / light-receiving surface side sealing film (230 mm × 230 mm) / power generation element (single crystal silicon cell: 125 mm × 125 mm, thickness: 220 μm) / the back side colored sealing film (230 × 230 mm) / back side protection member (TPT (Tedlar / PET / Tedlar: Model No. 2442), thickness: 350 μm) manufactured by ISOVOLTA By laminating in order, a laminate was obtained.

  The laminated body was heated and pressurized with a double vacuum chamber type vacuum laminator equipped with the diaphragm shown in FIG. The laminated body obtained above was placed on a placing table (heating plate) containing a heater installed in the lower chamber of the vacuum laminator so that the light-receiving surface side transparent protective member was on the lower side. Next, the laminate was heated by a heating plate set at 140 ° C. while degassing the lower and upper chambers as a vacuum (vacuum time: 1 to 10 minutes). And pressurization of a laminated body was started when the back side colored sealing film reached each temperature shown in the following table. The pressurization was performed by pressurizing the laminated body at a pressure of 0.1 MPa with a diaphragm by setting the pressure in the upper chamber to 0.1 MPa (pressurization time: 15 minutes). Thereby, the solar cell module in which each member was bonded and integrated was obtained. In addition, confirmation of the temperature of a back surface side colored sealing film was performed by sticking K thermocouple connected to Keyence NR1000 to the sealing film, and measuring resin temperature.

<Evaluation method>
・ Determining the appearance defect of the back side colored sealing film and cracking of the power generation element About the obtained solar cell module, visually check the appearance defect of the back side coloring sealing film such as craters and wrinkles and the presence of cracking of the power generation element. Confirmed with. The results are shown in Tables 1-2.

<Evaluation results>
When the pressure start temperature of the back side colored sealing film is less than 70 ° C., it is recognized that power generation element cracking occurs, and when it exceeds 110 ° C., wrinkles and crater-like appearance defects are observed. It was. From the above, it was shown that a solar cell module having a good appearance can be obtained if the pressure start temperature of the back side colored sealing film is 70 to 110 ° C.

  According to the method for manufacturing a solar cell module according to the present invention, it is possible to prevent the appearance defect of the back side colored sealing film and to obtain a solar cell module having a good appearance.

DESCRIPTION OF SYMBOLS 10 Laminated body 11 Light-receiving surface side transparent protective member 12 Back surface side protective member 13A Light-receiving surface side sealing film 13B Back surface side colored sealing film 14 Power generation element 15 Connection tab 100 Vacuum laminator 101 Lower chamber 102 Upper chamber 103 Diaphragm 105 Mounting stand 106 Lower chamber exhaust port 107 Lower chamber vacuum pump 108 Upper chamber exhaust port 109 Upper chamber vacuum pump

Claims (7)

A laminated body is obtained by laminating the light-receiving surface-side transparent protective member, the light-receiving surface-side sealing film, the power generation element, the back-side colored sealing film, and the back-side protective member in this order, and heating and pressurizing the laminated body In the manufacturing method of the solar cell module having a step of integrating by
The method of manufacturing a solar cell module, wherein the pressurization is started after the back side colored sealing film is heated to a range of 70 to 110 ° C.   2. The method for manufacturing a solar cell module according to claim 1, wherein each of the light-receiving surface side sealing film and the back side colored sealing film has a thickness of 0.05 to 2 mm. The said pressurization is performed by the pressure of the range of 1.0 * 10 < ³ > Pa-5.0 * 10 < ⁷ > Pa, The manufacturing method of the solar cell module of Claim 1 or 2 characterized by the above-mentioned.   The solar cell module according to any one of claims 1 to 3, wherein the light-receiving surface side sealing film and the back surface side colored sealing film include an ethylene-vinyl acetate copolymer and a crosslinking agent. Manufacturing method.   The method for producing a solar cell module according to claim 4, wherein the vinyl acetate content of the ethylene-vinyl acetate copolymer is 20 to 35 mass%.   The melt flow rate of the ethylene-vinyl acetate copolymer is 35 g / 10 min or less as measured on the condition of 190 ° C. and a load of 21.18 N according to JIS K7210. 6. A method for producing a solar cell module according to 5.   The back side colored sealing film contains a colorant, and the colorant is selected from the group consisting of titanium dioxide, calcium carbonate, ultramarine, and carbon black. The manufacturing method of the solar cell module of description.

Images