JP6962256B2 - Solar cell module - Google Patents

Description

The present invention relates to a solar cell module.

Conventionally, a solar cell module having a plurality of divided photoelectric conversion units is known. For example, Patent Document 1 describes a solar cell module in which a plurality of photoelectric conversion units are connected in series. A groove is provided between the plurality of photoelectric conversion units, and an element separation layer made of resin or the like is formed inside the groove.

Japanese Unexamined Patent Publication No. 11-340490

However, when the solar cell module described in Patent Document 1 has a plurality of photoelectric conversion portions, the resin portion filled in the opening of the groove portion may be deformed due to the internal stress of the solar cell module or the like. As a result, the adhesion between the resin portion in the groove portion and the other layer may decrease, and the reliability of the solar cell module may decrease.

The present invention has been made in view of the above, and an object of the present invention is to provide a solar cell module capable of suppressing a decrease in reliability due to internal stress or the like.

In the solar cell module according to one embodiment of the present invention, a plurality of photoelectric conversion units in which a base material layer, a lower electrode layer, a power generation layer, an upper electrode layer, and a sealing resin layer are laminated in this order and arranged apart from each other. And an element separation part provided between adjacent photoelectric conversion parts, and the element separation part is continuously provided in each of the two photoelectric conversion parts sandwiching the element separation part, and the base material layer and the lower portion. The electrode layer, the power generation layer, the first resin portion, the upper electrode layer, and the sealing resin layer are provided between the edge portion in which the electrode layer, the power generation layer, the upper electrode layer, and the sealing resin layer are laminated in this order and the two edge portions, and the lower electrode layer, the power generation layer, and the first resin are provided. It has a portion and a groove portion in which a second resin portion is filled in an opening penetrating the upper electrode layer, and the elastic modulus of the first resin portion is the elastic modulus of the sealing resin layer and the elastic modulus of the second resin portion. Greater than the rate.

In this solar cell module, the elastic modulus of the first resin portion provided between the power generation layer and the upper electrode layer at the edge of the element separation portion is within the elastic modulus of the sealing resin layer and the opening of the groove portion. It is larger than the elastic modulus of the filled second resin portion. As described above, since the elastic modulus of the first resin portion is relatively high, the stress generated by the shrinkage of the sealing resin layer or the like is absorbed by the first resin portion and transmitted to the second resin portion. Can be suppressed. Therefore, the deformation of the second resin portion is suppressed due to internal stress or the like, and the decrease in reliability of the solar cell module can be suppressed.

In one form, the width of the groove may be 25% or more and 200% or less of the total thickness of the base material layer, the lower electrode layer, the power generation layer, and the upper electrode layer. According to this configuration, the strength of the solar cell module can be maintained while maintaining the insulation between the photoelectric conversion units.

In one form, the width of the first resin portion may be 150% or more and 500% or less of the width of the groove portion. According to this configuration, the stress generated by the shrinkage of the sealing resin layer can be absorbed by the first resin portion while suppressing the generation of stress due to the shrinkage of the first resin portion or the like.

In one form, the thickness of the first resin portion may be 100% or more and 2500% or less of the total thickness of the lower electrode layer, the power generation layer, and the upper electrode layer. According to this configuration, the stress generated by the shrinkage of the sealing resin layer can be absorbed by the first resin portion while suppressing the generation of stress due to the shrinkage of the first resin portion or the like.

In one form, the thickness of the sealing resin layer in the element separation portion may be 10 μm or more and 30 μm or less. According to this configuration, the stress generated by shrinkage of the sealing resin layer or the like can be reduced while protecting the upper electrode layer and the second resin portion by the sealing resin layer.

According to the present invention, there is provided a solar cell module capable of suppressing a decrease in reliability due to internal stress or the like.

It is a top view which shows typically the solar cell module which concerns on one Embodiment of this invention. It is a figure which shows schematic the cross section along the line II-II of FIG. It is a figure for demonstrating the manufacturing method of the solar cell module of FIG. It is a figure for demonstrating the manufacturing method of the solar cell module of FIG.

Hereinafter, various embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a plan view schematically showing a solar cell module according to an embodiment of the present invention. The solar cell module 1 according to the present embodiment can be used, for example, for a clock face or the like. As shown in FIG. 1, when viewed from the light receiving surface 1A of the solar cell module 1, the solar cell module 1 has a circular shape as a whole, and is adjacent to a plurality of photoelectric conversion units R1 arranged apart from each other. It includes an element separation unit R2 provided between the matching photoelectric conversion units R1. In the present embodiment, the solar cell module 1 includes four photoelectric conversion units R1. Each photoelectric conversion unit R1 has a substantially fan shape, and is arranged along the circumferential direction of the solar cell module 1. The element separation portion R2 is formed in a substantially cross shape when viewed from the light receiving surface 1A side. For example, a connection structure (not shown) for electrically connecting a plurality of photoelectric conversion units R1 to each other, or an electrical connection between the solar cell module 1 and an external component is provided to the peripheral portion R3 of the solar cell module 1. A connection terminal (not shown) or the like may be provided.

FIG. 2 is a diagram schematically showing a cross section taken along the line II-II of FIG. The cross section shown in FIG. 2 is a cross section orthogonal to the extending direction of the element separating portion R2. As shown in FIG. 2, the solar cell module 1 has a base material layer 10, a lower electrode layer 20, a power generation layer 30, an upper electrode layer 40, and a sealing resin layer 50. The light incident from the light receiving surface 1A side of the solar cell module 1 passes through the sealing resin layer 50 and the upper electrode layer 40 and reaches the power generation layer 30.

In the present specification, the "lamination direction" refers to the base material layer 10, the lower electrode layer 20, the power generation layer 30, the upper electrode layer 40, the sealing resin layer 50, and the like. The directions are such that the layers are sequentially overlapped toward the resin layer 50. Further, in the following description, the sealing resin layer 50 side (that is, the light receiving surface 1A side) may be described as "upper" along the stacking direction, and the base material layer 10 side may be described as "lower" along the stacking direction. be.

The element separation portion R2 of the solar cell module 1 has two edge portions R21 and a groove portion R22 provided between the two edge portions R21. That is, when viewed in the cross section shown in FIG. 2, the edge portions R21 are provided on both end sides of the element separation portion R2 in the direction intersecting the stacking direction, and the groove portions R22 are provided at the central portion of the element separation portion R2. It is provided. Each edge portion R21 is continuously provided on each of the two photoelectric conversion portions R1 that sandwich the element separation portion R2.

In each photoelectric conversion unit R1 of the solar cell module 1, a base material layer 10, a lower electrode layer 20, a power generation layer 30, an upper electrode layer 40, and a sealing resin layer 50 are laminated in this order. In the edge portion R21 of the element separation portion R2, the base material layer 10, the lower electrode layer 20, the power generation layer 30, the first resin portion 60, the upper electrode layer 40, and the sealing resin layer 50 are laminated in this order. That is, in the edge portion R21, the first resin portion 60 is interposed between the power generation layer 30 and the upper electrode layer 40. Therefore, the upper electrode layer 40 provided on the power generation layer 30 in the photoelectric conversion unit R1 is curved so as to cover the first resin portion 60 from the end portion on the photoelectric conversion unit R1 side. Each layer of the edge portion R21 except the first resin portion 60 is continuous with each layer of the photoelectric conversion portion R1 adjacent to the edge portion R21. The groove portion R22 of the element separation portion R2 is provided with an opening O that penetrates the lower electrode layer 20, the power generation layer 30, the first resin portion 60, and the upper electrode layer 40 in the stacking direction. The opening O is filled with the second resin portion 70. That is, in the groove portion R22, the base material layer 10, the second resin portion 70, and the sealing resin layer 50 are laminated in this order. As a result, in the groove portion R22, the lower electrode layer 20, the power generation layer 30, the first resin portion 60, and the upper electrode layer 40 are in a state of being divided by the second resin portion 70.

The base material layer 10 is located on the lowermost side of the solar cell module 1 and constitutes an end surface 1B opposite to the light receiving surface 1A. Examples of the material constituting the base material layer 10 include resin films such as polyethylene naphthalate (PEN), polyimide (PI), and polyamide (PA). The material of the base material layer 10 is not particularly limited and can be changed as appropriate. Further, the base material layer 10 may have flexibility or may have rigidity. As an example, the thickness of the base material layer 10 (that is, the dimension in the stacking direction) can be about 25 μm or more and 150 μm or less.

The lower electrode layer 20 is a layer serving as one electrode for extracting the electric power generated in the power generation layer 30. As the material constituting the lower electrode layer 20, metal materials such as aluminum (Al), titanium (Ti), silver (Ag), and stainless steel (SUS) are used from the viewpoint of reflecting incident light to improve power generation efficiency. preferable. The material constituting the lower electrode layer 20 may be conductive and is not limited to the metal material. Further, the lower electrode layer 20 may be a laminated body in which a plurality of metal layers are laminated. As an example, the thickness of the lower electrode layer 20 can be about 0.2 μm or more and 1 μm or less.

The power generation layer 30 is a layer that generates electric power from incident light by the photoelectric effect, and is composed of a plurality of thin films (not shown) laminated along the stacking direction. As an example, when the solar cell module 1 is an amorphous silicon-based solar cell, the power generation layer 30 has a structure in which an n-type amorphous silicon thin film, an i-type amorphous silicon thin film, and a p-type amorphous silicon thin film are laminated in this order from the bottom. Has. The power generation layer 30 is not limited to the above type, and may be another type of power generation layer. As an example, the thickness of the power generation layer 30 can be about 0.2 μm or more and 3 μm or less.

The upper electrode layer 40 is a layer serving as the other electrode for extracting the electric power generated in the power generation layer 30. As the material constituting the upper electrode layer 40, for example, a transparent material having conductivity and light transmission such as indium tin oxide compound (ITO) is used. The material constituting the upper electrode layer 40 is not limited to ITO, and may be another transparent material having conductivity and light transmission. As an example, the thickness of the upper electrode layer 40 can be about 0.03 μm or more and 0.15 μm or less.

The sealing resin layer 50 is located on the uppermost side of the solar cell module 1 and constitutes the light receiving surface 1A. Further, the sealing resin layer 50 integrally covers the photoelectric conversion unit R1 and the element separation unit R2. As the material constituting the sealing resin layer 50, for example, a material containing saturated polyester, epoxy resin, phenoxy resin, or urethane resin as a main component (component having the highest content) can be used. In addition, olefin resin, vinyl resin, acrylic resin, phenol resin, melamine resin, polyamide resin, ketone resin, alkyd resin, rosin resin, petroleum resin, maleic acid resin, partial chillar resin, terpene resin, chroman-inden. Resin and the like can also be used as the main component. These resins may be used alone or in combination of two or more. The thickness of the sealing resin layer 50 in the photoelectric conversion unit R1 and the thickness of the sealing resin layer 50 in the element separation unit R2 are different from each other, and the thickness T50 of the sealing resin layer 50 in the element separation unit R2 is photoelectric conversion. It is smaller than the thickness of the sealing resin layer 50 in the portion R1. As an example, the thickness of the sealing resin layer 50 in the photoelectric conversion unit R1 can be about 10 μm or more and 70 μm or less, and the thickness T50 of the sealing resin layer 50 in the element separation unit R2 is about 10 μm or more and 30 μm or less. Can be. The thickness T50 of the sealing resin layer 50 in the element separating portion R2 is the dimension from the upper end of the second resin portion 70 to the upper end of the sealing resin layer 50 (that is, the light receiving surface 1A). do.

The first resin portion 60 is a portion used for forming an opening O in the manufacturing process of the solar cell module 1 described later, and is provided only in the element separation portion R2. The material of the first resin portion 60 is a material having a greater elastic modulus than the material of the second resin portion described later, and is, for example, 0.1 GPa, preferably 0.5 GPa or more larger than the material of the second insulating portion. An insulating material having an elastic modulus can be used. For example, a phenoxy resin, an epoxy resin, a saturated polyester resin, an acrylic resin, a polyamide resin and the like can be appropriately selected and used as the material of the first resin portion 60. As an example, the shape of the first resin portion 60 can be such that the thickness T60 of the first resin portion 60 is about 1 μm or more and 38 μm or less. Further, the width L60 of the first resin portion 60 can be about 90 μm or more and 300 μm or less. Here, the "width L60 of the first resin portion 60" is the first cross section shown in FIG. 2 (that is, a cross section orthogonal to the extending direction of the element separating portion R2) in a direction intersecting the stacking direction. It is the dimension of the resin portion 60, and is the dimension from one end on the photoelectric conversion part R1 side to the other end on the photoelectric conversion part R1 side. Further, in the present specification, the "width" is the maximum value of the dimensions in the direction orthogonal to the stacking direction in the cross section orthogonal to the extending direction of the element separating portion R2.

The second resin part 70 is, for example, a mixture of a phenoxy resin or an epoxy resin and a polyfunctional isocyanate compound to which an organic solvent is added, as shown in Japanese Patent Application Laid-Open No. 3594711, which is shown in Japanese Patent Application Laid-Open No. 11-140147. A mixture of one or more of a saturated polyester resin, an epoxy resin, an acrylic resin, and a polyamide resin and a melamine resin, to which an organic solvent is added, can be used. The organic solvent may be any one that can dissolve the above resin, and examples thereof include cyclohexanone, isophorone, γ-butyrolactone, N-methylpyrrolidone, butyl cellosolve acetate, and butyl carbitol acetate. These may be used alone or in combination. The width of the second resin portion 70 is substantially the same as the width L22 of the groove portion R22. As an example, the width of the second resin portion 70, that is, the width L22 of the groove portion R22 can be about 22 μm or more and 180 μm or less.

The width L22 of the groove portion R22 is 25% or more and 200% or less of the total thickness T1 of the base material layer 10, the lower electrode layer 20, the power generation layer 30, and the upper electrode layer 40. The width L60 of the first resin portion 60 is 150% or more and 500% or less of the width L22 of the groove portion R22. Further, the thickness T60 of the first resin portion 60 is 100% or more and 2500% or less of the total thickness T2 of the lower electrode layer 20, the power generation layer 30, and the upper electrode layer 40.

Further, the elastic modulus of the first resin portion 60 is larger than the elastic modulus of the sealing resin layer 50 and the elastic modulus of the second resin portion 70. The elastic modulus of the first resin portion 60 can be, for example, 3 GPa or more and 7 GPa or less. The elastic modulus of the sealing resin layer 50 can be, for example, 1 GPa or more and 4 GPa or less. The elastic modulus of the second resin portion 70 can be, for example, 1 GPa or more and 4 GPa or less. The elastic modulus of the second resin portion 70 is preferably larger than the elastic modulus of the sealing resin layer 50, and the difference is preferably about 10%. Further, the elastic modulus of the second resin portion 70 and the elastic modulus of the sealing resin layer 50 may be substantially the same as each other.

Next, a method of manufacturing the solar cell module 1 will be described with reference to FIGS. 3 and 4. 3 and 4 are diagrams for explaining a method of manufacturing the solar cell module shown in FIG. 1. Note that FIGS. 3 and 4 show an enlarged part of the solar cell module 1 in the middle stage of manufacturing.

First, as shown in FIG. 3A, the base material layer 10 is prepared, and the lower electrode layer 20 and the power generation layer 30 are laminated in this order on the base material layer 10. As a method for forming the lower electrode layer 20, a known film forming technique such as sputtering can be used. The power generation layer 30 can be formed by, for example, a plasma CVD (Chemical Vapor Deposition) method, a sputtering method, or the like.

Next, as shown in FIG. 3B, the first resin portion 60 is formed on the power generation layer 30 in the region to be the element separation portion R2. The first resin portion 60 can be formed by applying and curing a resin material to be the first resin portion 60 by, for example, screen printing or the like. After that, the upper electrode layer 40 is formed on the power generation layer 30 and the first resin portion 60. The upper electrode layer 40 is formed by, for example, a sputtering method.

Next, as shown in FIG. 4A, an opening O is formed in the region to be the groove R22. The opening O can be formed, for example, by irradiating the first resin portion 60 with a laser. Alternatively, it may be formed by a processing method that combines protection of a portion other than the opening O with a metal mask and plasma milling or ashing. When the opening O is formed by irradiation with a laser, it is desirable that the material constituting the first resin portion 60 has a high light absorption rate at the wavelength of the laser used. In this case, when the first resin portion 60 is irradiated with the laser, the first resin portion 60 efficiently generates heat, so that the lower electrode layer 20, the power generation layer 30, the first resin portion 60, and the portion where the laser is irradiated are located. The upper electrode layer 40 is removed. The wavelength of the laser to be irradiated is not particularly limited, and can be appropriately changed in relation to the light absorption characteristics of the material used for the first resin portion 60.

Next, as shown in FIG. 4B, the second resin portion 70 is formed. Similar to the first resin portion 60, the second resin portion 70 can be formed by applying and curing a resin material to be the first resin portion 60 by, for example, screen printing or the like. As a result, the second resin portion 70 is filled in the opening O.

Finally, the sealing resin layer 50 is formed so as to completely cover the upper electrode layer 40 and the second resin portion 70. The sealing resin layer 50 can be formed, for example, by applying an uncured resin material and then curing it by heating or the like. As a result, the solar cell module 1 shown in FIG. 1 is obtained.

As described above, in the solar cell module 1, the elastic modulus of the first resin portion 60 provided between the power generation layer 30 and the upper electrode layer 40 at the edge portion R21 of the element separation portion R2 is the elastic modulus of the sealing resin layer. It is larger than the elastic modulus of 50 and the elastic modulus of the second resin portion 70 filled in the opening O of the groove portion R22. As described above, since the elastic modulus of the first resin portion 60 is relatively high, the stress generated by the shrinkage of the sealing resin layer 50 or the like is absorbed by the first resin portion 60, and the second resin portion 70 It can be suppressed from being transmitted to. Therefore, the deformation of the second resin portion 70 is suppressed by internal stress or the like, and the second resin portion 70 and other layers (base material layer 10, lower electrode layer 20, power generation layer 30, upper electrode layer 40, and first resin) are suppressed. The decrease in adhesion with the part 60) is suppressed. Therefore, it is possible to suppress a decrease in reliability of the solar cell module.

The width L22 of the groove R22 is 25% or more and 200% or less of the total thickness T1 of the base material layer 10, the lower electrode layer 20, the power generation layer 30, and the upper electrode layer 40. As a result, the strength of the solar cell module 1 can be maintained while maintaining the insulation between the photoelectric conversion units R1.

The width L60 of the first resin portion 60 is 150% or more and 500% or less of the width L22 of the groove portion R22. As a result, the stress generated by the shrinkage of the sealing resin layer 50 can be absorbed by the first resin portion 60 while suppressing the generation of stress due to the shrinkage of the first resin portion 60 or the like.

The thickness T60 of the first resin portion 60 is 100% or more and 2500% or less of the total thickness T2 of the lower electrode layer 20, the power generation layer 30, and the upper electrode layer 40. As a result, the stress generated by the shrinkage of the sealing resin layer 50 can be absorbed by the first resin portion 60 while suppressing the generation of stress due to the shrinkage of the first resin portion 60 or the like.

Further, the thickness T50 of the sealing resin layer 50 in the element separating portion R2 is 10 μm or more and 30 μm or less. As a result, the stress generated by shrinkage of the sealing resin layer 50 or the like can be reduced while protecting the upper electrode layer 40 and the second resin portion 70 by the sealing resin layer 50.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in the above embodiment, the example in which the solar cell module 1 has a circular shape has been described, but the shape of the solar cell module 1 is not particularly limited and may be, for example, a rectangular shape. Further, the shape and number of the photoelectric conversion unit R1 are not particularly limited and can be changed as appropriate.

Further, in the above embodiment, the width L22 of the groove portion R22 is 25% or more and 200% or less of the total thickness T1 of the base material layer 10, the lower electrode layer 20, the power generation layer 30, and the upper electrode layer 40. However, the width L22 of the groove portion R22 does not have to be 25% or more and 200% or less of the thickness T1.

Further, in the above embodiment, the example in which the width L60 of the first resin portion 60 is 150% or more and 500% or less of the width L22 of the groove portion R22 has been described, but the width L60 of the first resin portion 60 is the groove portion R22. It does not have to be 150% or more and 500% or less of the width L22 of.

Further, in the above embodiment, the thickness T60 of the first resin portion 60 is 100% or more and 2500% or less of the total thickness T2 of the lower electrode layer 20, the power generation layer 30, and the upper electrode layer 40. As described above, the thickness T60 of the first resin portion 60 does not have to be 100% or more and 2500% or less of the thickness T2.

Further, in the above embodiment, the example in which the thickness T50 of the sealing resin layer 50 is 10 μm or more and 30 μm or less has been described, but the thickness T50 of the sealing resin layer 50 does not have to be 10 μm or more and 30 μm or less. ..

(Example)
Hereinafter, the present invention will be described based on Examples and Comparative Examples. The present invention is not limited to the following examples.

<Comparative Examples 1 and 2, Examples 1 to 3>
The solar cell modules according to Comparative Examples 1 and 2 and the solar cell modules according to Examples 1 to 3 of the present invention were prepared under the conditions shown in Table 1 below. First, polyethylene naphthalate (PEN) is prepared as a base material layer, aluminum (Al) as a lower electrode layer, and an amorphous silicon laminate as a power generation layer are laminated in this order, and then the element separation portion R2 is formed. A first resin portion was formed in the region using an epoxy-based insulating resin. Then, ITO was laminated as an upper electrode layer so as to cover the power generation layer and the first resin portion. After the upper electrode layer was formed, the region where the first resin portion was formed was irradiated with a laser to provide an opening, and the second resin portion was formed inside. After that, the solar cell modules according to Comparative Examples 1 and 2 and Examples 1 to 3 were created by laminating a phenoxy-based insulating resin as a sealing resin layer so as to cover the upper electrode layer and the second resin portion as a whole. bottom.

In the solar cell modules according to Comparative Examples 1 and 2 and Examples 1 to 3, the elastic modulus of the material of the first resin portion, the second resin portion and the sealing resin layer, the thickness of the base material layer, and the solar cell module The thickness T2, the width L22 of the groove portion, the width L60 of the first resin portion, the thickness T60 of the first resin portion, and the thickness T50 of the sealing resin layer in the above are as shown in Table 1 below, respectively. In Comparative Examples 1 and 2 and Examples 1 to 3, the elastic moduli of the first resin portion are different from each other.

Moisture resistance, power generation amount, warpage, and yield were evaluated for the solar cell modules according to Comparative Examples 1 and 2 and the solar cell modules according to Examples 1 to 3 of the present invention, respectively. In the evaluation of moisture resistance, 100 samples prepared under the same conditions were left to stand for 1000 hours under the conditions of a temperature of 60 ° C. and a humidity of 90%, and then the proportion of normally functioning samples was calculated. In the evaluation of the amount of power generation, the ratio of the actual amount of power generation to the theoretical value was calculated. In the evaluation of warpage, the warp generated in 1000 samples prepared under each condition was measured, and the maximum value was obtained. In the yield evaluation, the yield of the solar cell module manufactured under each condition was calculated.

The results of each of the above evaluations are shown in Table 2.

<Examples 4 to 10>
The solar cell modules according to Examples 4 to 10 of the present invention were prepared under the conditions shown in Table 3 below. In the solar cell module according to Examples 4 to 10, the elastic modulus of the material of the first resin portion, the second resin portion and the sealing resin layer, the thickness of the base material layer, the thickness T2 in the solar cell module, and the width of the groove portion. L22, the width L60 of the first resin portion, the thickness T60 of the first resin portion, and the thickness T50 of the sealing resin layer were set as shown in Table 3 below, respectively. In Examples 4 to 10, the values of the groove width L22 are different from each other.

The solar cell modules according to Examples 4 to 10 were also evaluated for moisture resistance, power generation amount, warpage, and yield, respectively. The results of each evaluation are shown in Table 4. The decrease in yield in Example 4 is considered to be due to the narrowing of the groove width (L22).

<Examples 11 to 18>
The solar cell modules according to Examples 11 to 18 of the present invention were prepared under the conditions shown in Table 5 below. In the solar cell module according to Examples 11 to 18, the elastic modulus of the material of the first resin portion, the second resin portion and the sealing resin layer, the thickness of the base material layer, the thickness T2 in the solar cell module, and the width of the groove portion. L22, the width L60 of the first resin portion, the thickness T60 of the first resin portion, and the thickness T50 of the sealing resin layer were set as shown in Table 5 below, respectively. In Examples 11 to 18, the values of the width L60 of the first resin portion are different from each other.

The solar cell modules according to Examples 11 to 18 were also evaluated for moisture resistance, power generation amount, warpage, and yield, respectively. The results of each evaluation are shown in Table 6. The decrease in yield in Example 11 is considered to be due to the narrowing of the width of the edge R21.

<Examples 19 to 25>
The solar cell modules according to Examples 19 to 25 of the present invention were prepared under the conditions shown in Table 7 below. In the solar cell module according to Examples 19 to 25, the elastic modulus of the material of the first resin portion, the second resin portion and the sealing resin layer, the thickness of the base material layer, the thickness T2 in the solar cell module, and the width of the groove portion. L22, the width L60 of the first resin portion, the thickness T60 of the first resin portion, and the thickness T50 of the sealing resin layer were set as shown in Table 7 below, respectively. In Examples 19 to 25, the values of the thickness T60 of the first resin portion are different from each other.

The solar cell modules according to Examples 19 to 25 were also evaluated for moisture resistance, power generation amount, warpage, and yield, respectively. The results of each evaluation are shown in Table 8.

<Examples 26 to 31>
The solar cell modules according to Examples 26 to 31 of the present invention were prepared under the conditions shown in Table 9 below. In the solar cell module according to Examples 26 to 31, the elastic modulus of the material of the first resin portion, the second resin portion and the sealing resin layer, the thickness of the base material layer, the thickness T2 in the solar cell module, and the width of the groove portion. L22, the width L60 of the first resin portion, the thickness T60 of the first resin portion, and the thickness T50 of the sealing resin layer were set as shown in Table 9 below, respectively. In Examples 26 to 31, the values of the thickness T50 of the sealing resin layer are different from each other.

The solar cell modules according to Examples 26 to 31 were also evaluated for moisture resistance, power generation amount, warpage, and yield, respectively. The results of each evaluation are shown in Table 10.

1 ... Solar cell module, 10 ... Base material layer, 20 ... Lower electrode layer, 30 ... Power generation layer, 40 ... Upper electrode layer, 50 ... Encapsulating resin layer, 60 ... First resin part, 70 ... Second resin part, L22, L60 ... width, O ... opening, R1 ... photoelectric conversion part, R2 ... element separation part, R21 ... edge part, R22 ... groove part, T1, T2, T50, T60 ... thickness.

Claims (5)

A plurality of photoelectric conversion units in which a base material layer, a lower electrode layer, a power generation layer, an upper electrode layer, and a sealing resin layer are laminated in this order and arranged apart from each other.
It is provided with an element separation unit provided between adjacent photoelectric conversion units.
The element separation part is
The base material layer, the lower electrode layer, the power generation layer, the first resin part, the upper electrode layer, and the sealing resin are continuously provided in each of the two photoelectric conversion parts that sandwich the element separation part. At the edges where the layers are stacked in this order,
It has a lower electrode layer, a power generation layer, a first resin portion, and a groove portion in which a second resin portion is filled in an opening penetrating the upper electrode layer, which is provided between the two edges. death,
A solar cell module in which the elastic modulus of the first resin portion is larger than the elastic modulus of the sealing resin layer and the elastic modulus of the second resin portion. The solar cell module according to claim 1, wherein the width of the groove is 25% or more and 200% or less of the total thickness of the base material layer, the lower electrode layer, the power generation layer, and the upper electrode layer. The solar cell module according to claim 1 or 2, wherein the width of the first resin portion is 150% or more and 500% or less of the width of the groove portion. The thickness of the first resin portion is 100% or more and 2500% or less of the total thickness of the lower electrode layer, the power generation layer, and the upper electrode layer, according to any one of claims 1 to 3. The solar cell module described. The solar cell module according to any one of claims 1 to 4, wherein the thickness of the sealing resin layer in the element separation portion is 10 μm or more and 30 μm or less.

Images