JP2015076560A - Wiring layer laminate for solar batteries and solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring layer laminate for solar batteries which makes possible to adjust each of an adhesive force between a base and an adhesion layer, and an adhesive force between a wiring layer and the adhesion layer independently.SOLUTION: A wiring layer laminate 1 for solar batteries to wire to solar battery cells having connection electrodes for wiring comprises: a flexible sheet-like base 11; an adhesion layer 12 provided on one face 11a of the base; and a wiring layer 13 provided on the face of the adhesion layer on the side opposite to the base. The adhesion layer has: a base-side adhesion layer 15 provided on the side of the base; and a wiring line-side adhesion layer 16 provided on the side of the wiring layer and bonded to the base-side adhesion layer. The wiring line-side adhesion layer includes a modified polyolefin and straight-chain low-density polyethylene; the percentage of the mass of the modified polyolefin to the mass of the straight-chain low-density polyethylene is 43% or larger in the wiring line-side adhesion layer.

Description

  The present invention relates to a solar cell wiring layer stack including a wiring layer patterned into an arbitrary shape by a mold, and a solar cell module including the solar cell wiring layer stack.

  Conventionally, corrosion processing by etching has been used as a technique for forming a metal foil pattern (wiring layer) by patterning a large-area metal foil into an arbitrary shape. In this method, a resist material having etching resistance is patterned on the metal foil, and then immersed in an etching solution, whereby the metal foil in a portion without the resist material can be removed. On the other hand, in this method, it is necessary to pattern the resist material, and there is a problem that it becomes difficult to pattern the resist material as the metal foil has a large area. In addition, since a large amount of an etching solution that corrodes the metal foil is used, a great amount of cost is required for installation of corresponding facilities and environmental measures.

  As another metal foil patterning method for solving this problem, for example, a punching method using a die blade as described in Patent Document 1 has been developed. Durability, shape accuracy, and processing area differ depending on the type of mold, but recent high-precision and large-area molds enable fine pattern processing on the order of hundreds of micrometers (micrometers). ing.

  When the metal foil is punched by the above-described mold, the durability of the mold becomes a problem. In particular, when the metal foil is punched with a blade portion having a sharp tip, the blade portion is likely to deteriorate. Therefore, in order to improve the durability of the mold, a half-cut method is generally performed. This is a method in which the metal foil and the buffer material are simultaneously punched, the tip of the blade is pressed from the metal foil side, and is stopped at an intermediate portion in the thickness direction of the buffer material. Thereby, it becomes possible to prevent that the front-end | tip of a blade part is crushed. Furthermore, by using an adhesive layer as the cushioning material and attaching the adhesive layer to the base material, it is possible to prevent a positional shift of the metal foil with respect to the base material and to form a highly accurate pattern.

Japanese Patent No. 3116209

  However, in general, the base material is formed of a resin material, while the metal foil pattern is formed of metal. Adhesive layer tends to have high adhesion to resin material but low adhesion to metal, etc., so adhesion between substrate and adhesive layer and adhesion between metal foil pattern and adhesive layer It becomes difficult to adjust the force.

  This invention is made in view of such a subject, Comprising: The adhesive force between a base material and an adhesive layer and the adhesive force between a wiring layer and an adhesive layer are adjusted independently, respectively. An object of the present invention is to provide a wiring layer laminate for solar cells and a solar cell module provided with the wiring layer laminate for solar cells.

In order to solve the above problems, the present invention proposes the following means.
The wiring layer laminate for solar cells of the present invention is a solar cell wiring layer laminate for wiring to solar cells having wiring connection electrodes, and has a flexible sheet-like base material, An adhesive layer provided on one surface of the base material, and a wiring layer provided on a surface of the adhesive layer opposite to the base material, wherein the adhesive layer is on the base material side And a wiring side adhesive layer provided on the wiring layer side and bonded to the base material side adhesive layer, the wiring side adhesive layer comprising a modified polyolefin and a linear chain A ratio of the mass of the modified polyolefin to the mass of the linear low-density polyethylene in the wiring-side adhesive layer is 43% or more.

  Another solar cell wiring layer laminate of the present invention is a solar cell wiring layer laminate for wiring to solar cells having wiring connection electrodes, and is a flexible sheet-like laminate. A base material, an adhesive layer provided on one surface of the base material, and a wiring layer provided on a surface of the adhesive layer opposite to the base material, the adhesive layer comprising: A substrate-side adhesive layer provided on the substrate side; and a wiring-side adhesive layer provided on the wiring layer side and bonded to the substrate-side adhesive layer, wherein the wiring-side adhesive layer is modified It is characterized by containing polyolefin.

In the above solar cell wiring layer laminate, the thickness of the adhesive layer is more preferably 5 μm or more and 100 μm or less.
In the above solar cell wiring layer laminate, the base-side adhesive layer is formed by curing a base-side adhesive that is a step curable adhesive by heating, and the wiring-side adhesive layer is It is formed by curing the wiring side adhesive, which is a step curable adhesive, by heating, and the adhesive strength in the 180 ° peel test specified in JIS K6854-2 is the difference between the base material and the base material side adhesive. 1.0 N / cm or more between, 0.05 N / cm or more and 1.0 N / cm or less between the wiring layer and the wiring side adhesive, and the base material and the base material side adhesive layer It is more preferably 3.0 N / cm or more between the wiring layers and 3.0 N / cm or more between the wiring layer and the wiring side adhesive layer.

  Moreover, the solar cell module of the present invention includes the wiring layer laminate for solar cells according to any one of the above, and a connection electrode for wiring, and the connection electrode is the wiring layer of the wiring layer laminate for solar cells. A solar cell electrically connected to the solar cell, a sealing material for sealing the solar cell, and a translucent substrate laminated on the side of the sealing material opposite to the solar cell wiring layer laminate It is characterized by providing these.

  According to the solar cell wiring layer laminate and the solar cell module of the present invention, the adhesive force between the base material and the adhesive layer and the adhesive force between the wiring layer and the adhesive layer are independently adjusted. Can do.

It is sectional drawing of the side surface of the solar cell module of one Embodiment of this invention. It is a figure explaining the manufacturing method of the laminated body of the solar cell module. It is sectional drawing explaining the manufacturing method of the laminated body.

Hereinafter, an embodiment of a solar cell module according to the present invention will be described with reference to FIGS. 1 to 3. In all the drawings below, the thicknesses and dimensional ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.
As shown in FIG. 1, the solar cell module 1 of the present embodiment includes a solar cell wiring layer laminate 10 (hereinafter also abbreviated as “laminate 10”) of the present invention and a wiring connection electrode 21. The solar cell 20 in which the connection electrode 21 is electrically connected to the wiring layer 13 of the stacked body 10, the sealing material 25 that seals the solar battery cell 20, and the stacked body 10 of the sealing material 25 are And a translucent substrate 30 laminated on the opposite surface.

  The laminated body 10 is for wiring to the connection electrode 21 of the solar battery cell 20. The laminate 10 includes a flexible back sheet (base material) 11, an adhesive layer 12 provided on one surface 11 a of the back sheet 11, and a surface of the adhesive layer 12 opposite to the back sheet 11. And a wiring layer 13 provided thereon.

The back sheet 11 is a material having flexibility and electrical insulation, and is formed in a film shape or a sheet shape. As a material of the back sheet 11, for example, a resin material such as acrylic, polycarbonate, polyethylene terephthalate (PET), polyethylene naphthalate, polyimide, urethane, epoxy, melamine, styrene, or a resin material obtained by copolymerizing these is used. Is possible. In the present embodiment, the back sheet 11 is formed of PET.
In addition, as a material for the back sheet 11, a material mixed with an organic or inorganic filler or the like can be used as necessary for controlling heat insulation, elasticity, and optical characteristics. Moreover, the back sheet 11 can also employ a laminated film in which a plurality of the above resin materials are laminated.

The adhesive layer 12 includes a base material side adhesive layer 15 provided on the back sheet 11 side, and a wiring side adhesive layer 16 provided on the wiring layer 13 side and joined to the base material side adhesive layer 15. .
As the base-material-side adhesive layer 15, for example, TOSOH-HMS (manufactured by Tosoh Corporation), which is high melt tension polyethylene, can be suitably used. The thickness of the base-side adhesive layer 15 is, for example, 60 μm (micrometer).
The wiring side adhesive layer 16 contains a modified polyolefin and L-LDPE (linear low density polyethylene). For example, Admer (registered trademark, manufactured by Mitsui Chemicals) can be suitably used as the modified polyolefin. The ratio of the mass of Admer to the mass of L-LDPE in the wiring side adhesive layer 16 is 43% or more. Since Admer and L-LDPE are both polyolefins, they are excellent in compatibility.
Note that the wiring-side adhesive layer 16 may include an admer without including L-LDPE. The wiring side adhesive layer 16 has a thickness of 20 μm, for example. The wiring side adhesive layer 16 will be examined in detail later.
As described later, the thickness of the adhesive layer 12 as a whole is preferably 5 μm or more and 100 μm or less because the wiring layer 13 is recessed when the wiring layer 13 is formed using a blade portion. The thickness of the adhesive layer 12 is more preferably 50 μm or more and 90 μm or less.

  The wiring layer 13 is formed by punching a metal such as a copper foil or an aluminum foil into a predetermined pattern using a mold. A wiring layer 13A that is a part of the wiring layer 13 corresponds to a positive electrode wiring for power generation output, and a wiring layer 13B that is the remaining part of the wiring layer 13 corresponds to a negative electrode wiring.

The solar battery cell 20 generates electric power by photoelectrically converting light incident from the light receiving surface 20a, which is the front surface. The solar battery cell 20 is a so-called back contact type solar battery cell in which the connection electrode 21 is provided on the back surface 20b. For example, an appropriate method can be adopted. The number of the connection electrodes 21 provided in the solar battery cell 20 can be an appropriate number of 2 or more as necessary.
In FIG. 1, only one solar battery cell 20 is shown in the solar battery module 1, but in general, the solar battery module includes several tens of such solar battery cells 20.
Each connection electrode 21 and the wiring layer 13 of the solar battery cell 20 are connected via a conductive connection material 23.
The conductive connecting material 23 is preferably made of solder or silver paste. As solder, the thing containing tin, silver, copper, bismuth, lead, a flux component, etc. can be used. As the silver paste, a paste containing a silicone-based cured resin, an epoxy-based cured resin, a urethane-based cured resin, an acrylic-based cured resin, silver particles, copper particles, nickel particles, or an appropriate meltable conductive member is used. can do.

If the sealing material 25 can seal and insulate the wiring layer 13 and the photovoltaic cell 20, it can be comprised from a suitable material. As a material suitable for the sealing material 25, for example, an ethylene / vinyl acetate copolymer (EVA) film can be cited.
When the sealing material 25 is composed of an EVA film, the sealing material 25 may be formed by laminating two or more EVA films so as to sandwich the solar battery cell 20.
The translucent substrate 30 is a member that guides incident light to the light receiving surface 20 a of the solar battery cell 20 and forms an outer surface opposite to the back sheet 11 in the solar battery module 1. In the present embodiment, a glass panel is used as the translucent substrate 30, and the translucent substrate 30 is adhered to the surface of the sealing material 25.

Next, the manufacturing method of the laminated body 10 of this embodiment which manufactures the laminated body 10 of the solar cell module 1 comprised as mentioned above is demonstrated.
As shown in FIG. 2, the base material side adhesive 15 </ b> A that is the raw material of the base material side adhesive layer 15 and the wiring side adhesive 16 </ b> A that is the raw material of the wiring side adhesive layer 16 are extruded from the die 101 and flowed in layers. These adhesives 15A and 16A are step curable adhesives.
The adhesives 15A and 16A are sandwiched between the back sheet 11 wound around the roller 102 and the copper foil 13C wound around the roller 103, and pressed by a pair of nip rolls 104 to be laminated. Thereby, 10 A of laminated bodies which laminated | stacked the back sheet 11, adhesive agent 15A, 16A, and copper foil 13C are manufactured.
The base material side adhesive 15A and the wiring side adhesive 16A constitute the adhesive layer 12A.

As shown in FIG. 3, the blade portion 107 provided on the outer peripheral surface of the roller 106 is pressed against the laminated body 10A from the copper foil 13C side. At this time, a half-cut construction method is performed in which the tip 107a of the blade portion 107 is pressed and stopped until it reaches an intermediate portion in the thickness direction D of the adhesive layer 12A to cut the copper foil 13C. In this example, the blade portion 107 is pressed until the tip 107a of the blade portion 107 reaches an intermediate portion in the thickness direction D of the wiring side adhesive 16A.
As the blade portion 107, a blade portion 107 whose cross section is axisymmetric with respect to an axis C connecting the central axis of the roller 106 and the tip 107 a of the blade portion 107 is used. A length L1 between the tips 107a of the adjacent blade portions 107 is not more than twice a length L2 described later.
When the blade portion 107 is pressed against the laminated body 10A, the position in the thickness direction D of the tip 107a of the blade portion 107 may vary. Even in this case, when the thickness of the adhesive layer 12A is 5 μm or more and 100 μm or less, the variation in the position in the thickness direction D of the tip 107a is easily absorbed.

When the copper foil 13C is cut by the blade portion 107, a burr 13a is formed on the copper foil 13C, and the copper foil 13C is peeled by a length L2 along the bottom surface 13b of the copper foil 13C with the tip 107a of the blade portion 107 as the center. . This length L2 includes specifications such as the material (hardness) of the adhesives 15A and 16A, the adhesive strength of the adhesives 15A and 16A, the specifications such as the material and thickness of the copper foil 13C, and the material and shape of the blade 107. Once the specifications are determined, it is uniquely determined.
For this reason, the test which cut | disconnects the laminated body 10A by the specification same as the specification when peeling the copper foil 13C of the laminated body 10A here and manufacturing the laminated body 10 is performed, and the copper foil 13C peels long By obtaining the length L2, the length L2 at which the copper foil 13C of the laminated body 10A peels can be estimated.
When the copper foil 13C is cut, a gap K is formed between the copper foil 13C and the wiring side adhesive 16A.

Since the length L1 between the tips 107a is not more than twice the length L2 from which the copper foil 13C peels, the gap K formed by the adjacent blade portions 107 is connected. A part 13c of the copper foil 13C corresponding to the connected gap K is peeled off by a known peeling device having an adhesive layer (not shown) to form the wiring layer 13 from the copper foil 13C. A part 13c of the copper foil 13C becomes an unnecessary part in the copper foil 13C.
A gap K is formed at any position along the bottom surface 13b of the copper foil 13C between the part 13c of the copper foil 13C and the wiring side adhesive 16A, and the part 13c of the copper foil 13C is formed from the wiring side adhesive 16A. Can be easily peeled off.
The base material side adhesive layer 15 and the wiring side adhesive layer 16 are formed by heating and curing the adhesives 15A and 16A in an oven (not shown).
The laminated body 10 is manufactured by the above process.

  In addition, when manufacturing the solar cell module 1 using this laminated body 10, the wiring layer 13 of the laminated body 10 and the connection electrode 21 of the photovoltaic cell 20 are connected via the conductive connection material 23, and the laminated body 10 is obtained. The solar battery cell 20 is mounted on. The solar cell module 1 is manufactured by sealing the solar battery cell 20 and the like with the sealing material 25 and bonding the light-transmitting substrate 30 to the surface of the sealing material 25.

About the Example and comparative example of the laminated body of the solar cell module comprised in this way, the experimental result which changed the specification of the contact bonding layer variously is demonstrated below.
As shown in Table 1, Comparative Example 1 and Examples 1 to 8 were performed by changing the ratio of the mass of admer, the mass of L-LDPE, and the mass of LDPE (low density polyethylene) in the wiring side adhesive layer of the adhesive layer. A solar cell module was created. For example, in Comparative Example 1, the ratio of the mass of admer, the mass of L-LDPE, and the mass of LDPE in the wiring side adhesive layer is 2: 8: 0.5. In this case, the ratio of the mass of the admer to the mass of the L-LDPE in the wiring side adhesive layer is 25% according to the formula (2/8). The reason why the LDPE is contained in the wiring side adhesive layer will be described later.

In Example 1, the ratio of the mass of admer, the mass of L-LDPE, and the mass of LDPE in the wiring side adhesive layer is 3: 7: 0.5. In this case, the ratio of the mass of the admer to the mass of the L-LDPE in the wiring side adhesive layer is 43% according to the formula (3/7).
In addition, the ratio of the mass of admer, the mass of L-LDPE, and the mass of LDPE in Example 8 in the wiring side adhesive layer is 10: 0: 0.5, and L-LDPE is contained in the wiring side adhesive layer. It means that the ratio of the mass of admer and the mass of LDPE is 10: 0.5 without being included.
In the solar cell modules of Comparative Example 1 and Examples 1 to 8, the thickness of the wiring side adhesive layer is 25 μm.

The 180 ° peel test defined in JIS K6854-2 was performed on the solar cell modules of Comparative Example 1 and Examples 1 to 8, and the adhesive strength was measured.
The adhesive force between the wiring layer and the wiring-side adhesive after laminating the pair of adhesives with the back sheet and the copper foil (after lamination) was 0.00 N / cm in Comparative Example 1 and 0.001 in Example 1. For example, 05 N / cm. The adhesive force between the wiring layer and the wiring side adhesive is desirably 0.05 N / cm or more and 1.0 N / cm or less. For this reason, the evaluation of a part of the peelability of the copper foil of Comparative Example 1 in which the adhesive force between the wiring layer and the wiring side adhesive is 0.00 N is “x”.

When the ratio of the mass of admer, the mass of L-LDPE, the mass of LDPE in Examples 7 and 8 is 9: 1: 0.5 and 10: 0: 0.5 The adhesive force between the wiring layer and the wiring side adhesive is increased. Even in this case, if the laminate is heated, a part of the copper foil can be peeled off, and thus the evaluation is “◯”. In the case of Example 1, although a part of copper foil can be peeled off, since the edge of the part left as a wiring layer from copper foil floats about 1 mm, for example, evaluation becomes "(circle)".
The evaluation of the peelability of a part of the copper foils of Examples 2 to 6 is “」 ”which is superior to“ ◯ ”.

Next, the thickness of the base material side adhesive layer and the thickness of the wiring side adhesive layer were changed as shown in Table 2, and solar cell modules of Comparative Examples 2 to 5 and Examples 9 to 12 were prepared. In addition, the base material side adhesive layer is formed by the above-mentioned TOSOH-HMS, and the wiring side adhesive layer has a mass ratio of admer, L-LDPE, and LDPE mass in the wiring side adhesive layer of 6: 4: What is 0.5 is used.
The thickness of the base-side adhesive layer in the solar cell modules of Comparative Examples 2 to 4 means that the adhesive layer includes only the wiring-side adhesive layer without including the base-side adhesive layer. The thickness of the wiring side adhesive layer in the solar cell module of Comparative Example 5 means that the adhesive layer is composed of only the base material side adhesive layer without including the wiring side adhesive layer.

A peel test was performed on the solar cell modules of Comparative Examples 2 to 5 and Examples 9 to 12, and the adhesive strength was measured.
Since the adhesive force between the back sheet and the base material side adhesive after lamination is not provided with the base material side adhesive layer in Comparative Examples 2 to 4, the adhesive force between the back sheet and the wiring side adhesive is It becomes. The adhesive force between the back sheet and the base material side adhesive is 0.8 N / cm in Comparative Example 2, 0.8 N / cm in Comparative Example 3, and the like.
Since it is desirable that the adhesive force between the back sheet and the base material side adhesive is 1.0 N / cm or more, the evaluation of the solar cell modules of Examples 9 to 12 and Comparative Example 5 is “◯”, and the comparison The evaluation of the solar cell modules of Examples 2 to 4 is “x”.

The adhesive force between the wiring layer and the wiring-side adhesive after lamination is an adhesive force between the wiring layer and the substrate-side adhesive because Comparative Example 5 does not include the wiring-side adhesive.
The adhesive force between the wiring layer and the wiring side adhesive is 0.20 N / cm in Comparative Example 2, 0.25 N / cm in Comparative Example 3, and the like. Since it is desirable that the adhesive force between the wiring layer and the wiring-side adhesive is relatively weak at 0.05 N / cm or more and 1.0 N / cm or less, any one of Comparative Examples 2 to 5 and Examples 9 to 12 is used. In the solar cell module, the evaluation is “◯”.

Since the adhesive force between the wiring layer and the wiring side adhesive layer after heating the laminate (after heating) is not provided with the wiring side adhesive layer in Comparative Example 5, the wiring layer and the substrate side adhesive layer Adhesive strength between. The adhesive force between the wiring layer and the wiring side adhesive layer is 28.0 N / cm in Comparative Example 2, 25.0 N / cm in Comparative Example 3, and the like.
Since the adhesive force between the wiring layer and the wiring side adhesive layer is desirably 3.0 N / cm or more, the evaluation of the solar cell modules of Comparative Examples 2 to 4 and Examples 9 to 12 is “◯”. The evaluation of the solar cell module of Comparative Example 5 is “x”.

  In addition, as for the adhesive force between a base material and a base material side adhesive layer, it is desirable that it is 3.0 N / cm or more similarly to the adhesive force between a wiring layer and a wiring side adhesive layer. By comprising in this way, it becomes difficult to peel a base material and a base material side contact bonding layer as much as a wiring layer and a wiring side contact bonding layer.

The wiring-side adhesive layer of the laminated adhesive layer described above contained LDPE. The results of examining the effect of including LDPE in the wiring side adhesive layer and the ratio of including LDPE in the wiring side adhesive layer will be described.
As shown in Table 3, a solar cell module of Example 13 in which Admer and L-LDPE were contained in a mass ratio of 6: 4 in the wiring side adhesive layer was prepared, and in the wiring side adhesive layer of Example 13 Furthermore, the solar cell module of Examples 4 and 14 which made LDPE contain by the mass ratio of 0.5 and 1.0 was created. The solar cell module of Example 4 is shown in Table 1. The solar cell modules of Examples 13 and 14 differ from the solar cell module of Example 4 only in the content of LDPE in the wiring side adhesive layer.

The wiring-side adhesive extruded from the die is required to prevent surging that is not flat but wavy. Surging was prevented in the solar cell modules of Examples 4 and 14 (evaluation was “◯”), but surging occurred in the solar cell module of Example 13 in which the wiring side adhesive layer did not contain LDPE (evaluation) Is “×”). In Examples 4 and 14, it was found that the effect did not change even when the ratio of containing LDPE was changed.
If the occurrence of surging is not a problem, the wiring side adhesive layer may not contain LDPE, but the wiring side adhesive layer contains admer and L-LDPE in a mass ratio of 6: 4. Sometimes, LDPE is preferably contained in a mass ratio of 0.5 or more.

As described above, according to the solar cell module 1 and the laminated body 10 of the present embodiment, the adhesive layer 12 has the substrate-side adhesive layer 15 and the wiring-side adhesive layer 16. For this reason, the adhesive force between the back sheet 11 and the adhesive layer 12 and the adhesive force between the wiring layer 13 and the adhesive layer 12 can be independently adjusted.
Since the ratio of the mass of Admer to the mass of L-LDPE in the wiring-side adhesive layer 16 is 43% or more, the copper foil 13C is attached to the wiring-side adhesive 16A as in Examples 1 to 7, while the wiring side A part 13c of the copper foil 13C can be easily peeled off from the adhesive 16A. Even when L-LDPE is not included in the wiring-side adhesive layer 16 as in Example 8, a part 13c of the copper foil 13C can be easily formed from the wiring-side adhesive 16A while the copper foil 13C is attached to the wiring-side adhesive 16A. Can be peeled off.

When the thickness of the adhesive layer 12 is 5 μm or more and 100 μm or less, it is easy to absorb the variation in the position in the thickness direction D of the tip 107a of the blade portion 107 when the blade portion 107 is pressed against the laminated body 10A. Can do.
The adhesive strength in the 180 ° peel test is 1.0 N / cm or more between the back sheet 11 and the base material side adhesive 15A, and 0.05 N / cm or more between the wiring layer 13 and the wiring side adhesive 16A. 0.0 N / cm or less, 3.0 N / cm or more between the back sheet 11 and the base-side adhesive layer 15, and 3.0 N / cm or more between the wiring layer 13 and the wiring-side adhesive layer 16. .
Thereby, a part 13c of the copper foil 13C can be easily peeled from the wiring side adhesive 16A while the copper foil 13C is attached to the wiring side adhesive 16A. The back sheet 11 and the base material side adhesive layer 15, and the wiring layer 13 and the wiring side adhesive layer 16 can be reliably bonded.

As mentioned above, although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and modifications, combinations, and deletions within a scope that does not depart from the gist of the present invention. Etc. are also included.
In the embodiment, in the manufacturing method of the laminated body 10, the blade portion 107 is pressed until the tip 107a of the blade portion 107 reaches the intermediate portion in the thickness direction D of the wiring-side adhesive 16A. However, the blade 107 may be pressed until the tip 107a of the blade 107 reaches an intermediate portion in the thickness direction D of the base material side adhesive 15A.

(Example)
Below, although the Example of the laminated body 10 of this invention is described in detail, the structure of the laminated body 10 of this invention is not limited to this.
PET with PVF is coated by gravure printing on a 250 μm thick PET film (product name: S10, manufactured by Toray) with a 25 μm thick PVF (polyvinyl fluoride resin) film (product name: PV2111, manufactured by DuPont). A back sheet 11 as a film was prepared.

TOSOH-HMS is used as the substrate-side adhesive layer 15, and the ratio of the admer mass, the L-LDPE mass, and the LDPE mass in the wiring-side adhesive layer 16 of Example 4 described above as the wiring-side adhesive layer 16 is 6 : 4: 0.5 was used. As the copper foil 13C, an electrolytic copper foil having a thickness of 35 μm (manufactured by JX Nippon Mining & Metals) was used.
By a known extruder laminating method, two-layer adhesives 15A and 16A were sandwich-laminated with the back sheet 11 and the copper foil 13C using a tandem machine. The thickness of the base-side adhesive 15A was 60 μm, and the thickness of the wiring-side adhesive 16A was 25 μm.
The formation of the adhesives 15A and 16A is not limited to the extruder laminating method, and may be performed by coextrusion or die coating.
The adhesive force between the back sheet 11 and the base material side adhesive 15A was 1.4 N / cm, and the adhesive force between the copper foil 13C and the wiring side adhesive 16A was 0.20 N / cm.

Next, the wiring layer 13 was patterned by a half-cut method.
The wiring layer 13 was formed by pressing the blade portion 107 against the laminated body 10A so that the tip of the blade portion was at the intermediate portion in the thickness direction D of the adhesive layer 12A and peeling off a part 13c of the copper foil 13C.
Subsequently, as a step adhesion process, the line speed was adjusted in a floating dryer set to 160 ° C. so that the heating time was 60 seconds, and the laminate 10A was heated to produce the laminate 10. The adhesive force between the wiring layer 13 and the wiring side adhesive layer 16 after heating was 25 N / cm.

DESCRIPTION OF SYMBOLS 1 Solar cell module 10 Laminated body (Wiring layer laminated body for solar cells)
11 Back sheet (base material)
11a One surface 12 Adhesive layer 13 Wiring layer 15 Base material side adhesive layer 15A Base material side adhesive 16 Wiring side adhesive layer 16A Wiring side adhesive 20 Solar cell 21 Connection electrode 25 Sealing material 30 Translucent substrate

Claims (5)

A wiring layer laminate for a solar battery for wiring to a solar battery cell having a connection electrode for wiring,
A sheet-like base material having flexibility;
An adhesive layer provided on one surface of the substrate;
A wiring layer provided on the surface of the adhesive layer opposite to the substrate;
With
The adhesive layer is
A base material side adhesive layer provided on the base material side;
A wiring side adhesive layer provided on the wiring layer side and bonded to the base material side adhesive layer;
Have
The wiring side adhesive layer includes a modified polyolefin and a linear low density polyethylene,
The solar cell wiring layer laminate, wherein a ratio of the mass of the modified polyolefin to the mass of the linear low-density polyethylene in the wiring-side adhesive layer is 43% or more. A wiring layer laminate for a solar battery for wiring to a solar battery cell having a connection electrode for wiring,
A sheet-like base material having flexibility;
An adhesive layer provided on one surface of the substrate;
A wiring layer provided on the surface of the adhesive layer opposite to the substrate;
With
The adhesive layer is
A base material side adhesive layer provided on the base material side;
A wiring side adhesive layer provided on the wiring layer side and bonded to the base material side adhesive layer;
Have
The wiring layer laminate for a solar cell, wherein the wiring side adhesive layer contains a modified polyolefin.   The solar cell wiring layer laminate according to claim 1, wherein the adhesive layer has a thickness of 5 μm to 100 μm. The base material side adhesive layer is formed by curing the base material side adhesive which is a step curable adhesive by heating,
The wiring side adhesive layer is formed by curing the wiring side adhesive, which is a step curable adhesive, by heating,
The adhesive strength in the 180 ° peel test defined in JIS K6854-2 is
1.0 N / cm or more between the base material and the base material side adhesive;
0.05 N / cm or more and 1.0 N / cm or less between the wiring layer and the wiring-side adhesive;
It is 3.0 N / cm or more between the base material and the base material side adhesive layer,
3. The solar cell wiring layer laminate according to claim 1, wherein the wiring layer stack is 3.0 N / cm or more between the wiring layer and the wiring-side adhesive layer. A wiring layer laminate for solar cells according to any one of claims 1 to 4,
A solar battery cell having a connection electrode for wiring, wherein the connection electrode is electrically connected to the wiring layer of the wiring layer laminate for solar cells;
A sealing material for sealing the solar battery cell;
A translucent substrate laminated on the side opposite to the solar cell wiring layer laminate of the encapsulant;
A solar cell module comprising:

Images