JP7089828B2 - Solar cell module with built-in heater and its manufacturing method - Google Patents

Description

The present invention relates to a solar cell module with a built-in heater and a method for manufacturing the same.

Solar cells as a clean energy source have attracted attention, and solar cell modules having various forms have been developed. In the case of a solar cell module installed in a snowfall area, there is an inconvenience that power generation cannot be performed or power generation efficiency is lowered due to snow accumulation on the light receiving surface. Therefore, a solar cell module capable of melting snow adhering to the surface has been developed. As an example of a solar cell module with a snow melting function, a one in which a sheet having a heater function is arranged between a surface protection panel and a solar cell is known. When a sheet having a heater function is arranged between the surface protection panel and the solar cell, this sheet is required to have low light-shielding property so as not to reduce the power generation efficiency. For this reason, Patent Document 1 proposes a structure in which linear heaters are multiple times folded and stretched, and Patent Document 2 exemplifies a transparent film whose surface is coated with a transparent electrode film. .. In this way, when arranging a sheet having a heater function between the surface protection panel and the solar cell, it is necessary to ensure sufficient translucency, so that the material and shape of the heater to be used are limited and high. The snow melting function may not be exhibited.

On the other hand, a solar cell module in which a sheet having a heater function is arranged on the opposite side of the surface protection panel in the solar cell has also been developed. When a sheet having a heater function is provided on the surface side of the solar cell opposite to the light receiving surface, the heaters can be densely arranged without considering the translucency, so that the snowmelt function can be enhanced. Patent Document 3 proposes a solar cell-integrated snow melting sheet having a surface protective layer, a solar cell element, and a heating element in this order and having flexibility. However, in Patent Document 3, the shape, structure, etc. of the heating element in consideration of snowmeltability have not been studied.

Japanese Unexamined Patent Publication No. 8-260638 Japanese Unexamined Patent Publication No. 2004-39753 Japanese Unexamined Patent Publication No. 2015-82611

Usually, when a rectangular solar cell module is arranged on a roof or the like, it is often arranged so that the long sides are located vertically. Further, since it is necessary to connect a plurality of solar cell modules in parallel, the solar cell module requires two terminal areas (power supply extraction units). Two electrode terminals are provided in each terminal area. Further, in order to enhance the snow melting function, it is desirable to arrange a plurality of heater portions so as to substantially cover the entire surface of the sheet, and it is necessary to connect the plurality of heater portions in parallel. As a heater sheet of the conventional solar cell module with a built-in heater in consideration of these, there is one having the structure of FIG.

The heater sheet 100 of FIG. 4 has a rectangular shape in a plan view, and is obliquely arranged on a roof or the like so that the long sides are located vertically. When the solar cell module with a built-in heater having the heater sheet 100 of FIG. 4 is arranged on the roof, the lower part is the eaves side of the roof and the upper part is the ridge side of the roof. The heater sheet 100 of FIG. 4 includes a base sheet 101, 10 heater portions 102 arranged on the back surface of the base sheet 101, a first terminal region 103, a second terminal region 104, and a first electrode wiring 105. And has a second electrode wiring 106. The first electrode wiring 105 and the second electrode wiring 106 are connected in parallel to the heater portions 102 of 10, and the first electrode wiring 105 and the second electrode wiring 106 are the first terminal region 103 and the second terminal, respectively. It is connected to the area 104. The terminal of the first electrode and the terminal of the second electrode are exposed from the first terminal area 103 on the back surface side of the module, and the terminal of the first electrode and the terminal of the first electrode are also exposed on the back surface side of the module from the second terminal area 104. The terminal of the second electrode is configured to be exposed. Since the two terminal areas are provided on the left and right in this way, when a plurality of solar cell modules are arranged side by side, the terminals of the adjacent first electrode and the terminals of the second electrode can be connected to each other. , A plurality of heater sheets 100 are connected in parallel.

In the heater sheet 100, the first electrode wiring 105 is provided so as to cover the peripheral edge of one surface of the base material sheet 101, while the second electrode wiring 106 is provided inside the first electrode wiring 105. It is connected to each heater unit 102. In the case of the heater sheet 100 having such a structure, since there is a distance of at least 105 minutes from the lower end edge of the heater sheet 100 to the heater portion 102, the lower end edge of the heater sheet 100, that is, the lower end of the solar cell module. The edges cannot be heated sufficiently. If the lower edge cannot be heated sufficiently, the snow accumulated on this surface cannot be sufficiently melted. In particular, if the snow remains on the lower edge of the eaves side without melting, the module surface cannot be slid down from the upper end (building side), so that the module surface is gradually covered with snow from the lower end. Therefore, in the solar cell module with a built-in heater, it is important to have a structure in which the lower end edge can be heated particularly sufficiently.

On the other hand, the first electrode wiring 105 and the second electrode wiring 106 in the heater sheet 100 are desired to be thin films so as not to increase the thickness of the module. Therefore, in order to secure sufficient conductivity, the width of the first electrode wiring 105 and the second electrode wiring 106 needs to be widened. For example, the width of the first electrode wiring 105 and the width of the second electrode wiring 106 may be required to be about 20 to 30 mm in order to satisfy the electrical characteristics. Therefore, it is difficult to make the heater portion 102 closer to the lower end edge of the heater sheet 100 of FIG. 4 by thinning the wiring so that the lower end edge can be sufficiently heated.

The present invention has been made based on the above circumstances, and an object thereof is to provide a solar cell module with a built-in heater which can sufficiently heat the lower end edge and has a good snowmelt function, and a method for manufacturing the same. To provide.

The present invention made to solve the above-mentioned problems is a solar cell module with a built-in heater including a surface protection panel, a solar cell, and a rectangular laminated body in a plan view in which a heater sheet is laminated in this order. A plurality of heater portions, a first terminal region, a second terminal region, a first electrode wiring, and a second electrode, each of which is a base sheet having a rectangular shape in a plan view and arranged on one surface of the base sheet. The first electrode wiring and the second electrode wiring have wiring, and the plurality of heater portions are connected in parallel, and are connected to the first terminal region and the second terminal region, respectively, and the base material sheet. One of the plurality of heater portions is arranged on at least one edge of the pair of long sides, and the first electrode wiring and the second are on the edge side of the one heater portion. It is a solar cell module with a built-in heater in which electrode wiring is not arranged.

The heater sheet of the solar cell module with a built-in heater has a structure in which wiring is not arranged further outside than one heater portion provided on at least one edge of a pair of long sides. That is, this one heater portion can be arranged very close to the edge. Therefore, when the solar cell module with a built-in heater is installed so that the side on which this one heater portion is arranged is on the lower side, the lower end edge can be sufficiently heated and a good snowmelt function can be exhibited. ..

The plurality of heater portions are substantially strip-shaped and are arranged along the long side of the base material sheet, and the first terminal region is arranged on one side of a pair of short sides of the base material sheet. The second terminal region is arranged on the other side of the pair of short sides of the base material sheet, and the first electrode wiring is arranged on one edge of the pair of short sides of the base material sheet. 1 electrode edge portion, a plurality of first electrode heater portion connecting portions connecting the first electrode edge portion and one end of the plurality of heater portions, respectively, the first electrode edge portion and the first terminal region. The second electrode wiring has a first electrode first terminal region connecting portion for connecting the first electrode, and a first electrode second terminal region connecting portion for connecting the first electrode edge portion and the second terminal region. , A plurality of second electrode edge portions arranged on the other edge of the pair of short sides of the base material sheet, and a plurality of connecting the second electrode edge portion and the other ends of the plurality of heater portions, respectively. The second electrode heater portion connecting portion, the second electrode first terminal region connecting portion connecting the second electrode end edge portion and the first terminal region, and the second electrode end edge portion and the second terminal region. The second electrode second terminal region connecting portion is provided, and the first electrode second terminal region connecting portion and the second electrode first terminal region connecting portion are any one of the plurality of heater portions. It is preferable that they are arranged between the two heater portions.

By making the heater sheet having such a structure, one of a plurality of heater portions is specifically arranged on the edges on both long sides of the base sheet, and one of the plurality of heater portions is arranged outside the respective heater portions. Can be arranged so that the first electrode wiring and the second electrode wiring are not arranged. Therefore, the lower end edge can be sufficiently heated regardless of which of the two long sides is arranged below. Further, the heater sheet having such a structure can be manufactured with relatively high productivity.

At least one of the plurality of first electrode heater unit connecting portions and the plurality of second electrode heater unit connecting portions may be disconnected. For example, depending on the area, the amount of snow may not be so large and it may not be necessary to heat the entire surface. In this case, for example, having a structure in which an on / off switch is provided for each heater unit, or manufacturing a plurality of types of solar cell modules with built-in heaters having different sizes and outputs of the heater units leads to an increase in production cost. On the other hand, in the solar cell module with a built-in heater, those in which at least one of the plurality of first electrode heater unit connecting portions and the plurality of second electrode heater unit connecting portions is cut are the same in the same process. Can be manufactured by cutting the connecting portion connected to the heater portion of the portion that does not require heating, and a configuration that does not heat a part of the heater portion can be obtained. By doing so, it is possible to suppress the increase in the production cost of such a solar cell module with a built-in heater while suppressing the power consumption for melting snow.

The width of the first electrode wiring and the second electrode wiring is preferably 10 mm or more and 50 mm or less. By setting the width of the first electrode wiring and the second electrode wiring within the above range, it is possible to secure a sufficiently wide arrangement area of the heater portion while ensuring sufficient conductivity, and further enhance the snowmelt function. be able to.

The distance between one long side of the base material sheet and the one heater portion arranged on the edge portion on the long side side of the one is preferably 10 mm or less. By doing so, the lower end edge can be heated more sufficiently, and the snowmelt function can be further enhanced.

It is preferable that the solar cell module with a built-in heater further includes a metal frame that covers at least the long side side surface of the laminated body. When such a metal frame is further provided, the heater portion arranged close to the edge portion on the long side side makes it relatively easy to heat the metal frame, and the frame can also promote snowmelt. Therefore, with such a configuration, the snow melting function at the lower end edge can be further enhanced.

Another invention made to solve the above-mentioned problems is a method for manufacturing the solar cell module with a built-in heater, wherein the base material sheet and a metal layer laminated on one surface of the base material sheet are formed. A solar cell with a built-in heater that comprises a step of removing a part of the metal layer in the metal laminated sheet provided by etching, and forms the plurality of heater portions, the first electrode wiring, and the second electrode wiring from the metal layer by the etching. It is a manufacturing method of a module.

According to the manufacturing method, a plurality of heater portions, first electrode wiring and second electrode wiring can be formed on the base sheet by etching, and the solar cell module with a built-in heater can be effectively manufactured. Can be done.

According to the present invention, it is possible to provide a solar cell module with a built-in heater which can sufficiently heat the lower end edge and has a good snowmelt function, and a method for manufacturing the same.

FIG. 1 is a schematic partial cross-sectional view of a solar cell module with a built-in heater according to an embodiment of the present invention. FIG. 2 is a bottom view of the heater sheet of the solar cell module with a built-in heater of FIG. FIG. 3 is a plan view of the heater sheet of the solar cell module with a built-in heater according to another embodiment. FIG. 4 is a bottom view of the heater sheet of the conventional solar cell module with a built-in heater.

Hereinafter, the solar cell module with a built-in heater and the manufacturing method thereof according to the embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

<Solar cell module 10 with built-in heater>
The solar cell module 10 with a built-in heater according to an embodiment of the present invention includes a laminated body 11 in which a surface protection panel 12, a solar cell 13, a heater sheet 14 and a back sheet 15 are laminated in this order, and a frame 16. To prepare for. In the solar cell module 10 with a built-in heater, the surface on the surface protection panel 12 side (upper side in FIG. 1) is the light receiving surface. The laminated body 11 has a rectangular shape in a plan view. FIG. 1 schematically shows an edge portion in a cross section along a short side of the laminated body 11 in a plan view. In the solar cell module 10 with a built-in heater, a conventionally known configuration of a solar cell module with a built-in heater can be adopted as a configuration other than the heater sheet 14.

The surface protection panel 12 is a translucent plate or sheet. The surface protection panel 12 has functions such as weather resistance and impact resistance on the surface side. Examples of the material of the surface protection panel 12 include glass and resin. Examples of the resin include polycarbonate, polymethylmethacrylate, cyclic polyolefin, polystyrene, polyethylene terephthalate, polyethylene naphthalate, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, polypropylene, polyethylene and the like.

The solar cell 13 is an element that generates electricity based on the light incident from the surface protection panel 12 side. The solar cell 13 is not particularly limited as long as it can convert light energy into electric energy and can take out the converted electric energy to the outside. The types of the solar cell 13 include a single crystal silicon solar cell, a polycrystal silicon solar cell, a ribbon silicon solar cell, a spherical silicon solar cell, a thin film silicon solar cell, a heterojunction (HIT) solar cell, a CIGS solar cell, and a CdTe. Examples thereof include solar cells, dye-sensitized solar cells, organic semiconductor solar cells, and Group III-V multi-junction solar cells.

The heater sheet 14 is arranged on the back surface side of the solar cell 13, that is, between the solar cell 13 and the back sheet 15. The specific structure of the heater sheet 14 will be described later.

The back sheet 15 has functions such as weather resistance and impact resistance on the back surface side. As the material of the back sheet 15, the same material as that of the surface protection panel 12 can be mentioned. However, the back sheet 15 does not have to have translucency.

The solar cell 13 and the heater sheet 14 are laminated between the surface protection panel 11 and the back sheet 15 via a sealing material 17. That is, the solar cell 13 and the heater sheet 14 are in a state of being sealed by the sealing materials 17a, 17b, 17c. Examples of the sealing material include polyethylene, polypropylene, ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, propylene-ethylene-α-olefin copolymer, etc. Polyethylene resin, butyral resin, styrene resin, epoxy resin, (meth) acrylic resin, urethane resin, silicon resin, synthetic rubber and the like can be mentioned. It is preferable that the sealing material 17a interposed between the surface protection panel 11 and the solar cell 13 contains a wavelength conversion agent.

The frame 16 is configured to cover at least the long side side surface of the laminated body 11. The frame 16 is configured to cover the front and back edges of the laminate 11. As the material of the frame 16, metals such as aluminum and stainless steel are preferable, and aluminum is more preferable.

(Heater sheet 14)
The heater sheet 14 includes the base sheet 21, seven heater portions 22 (22a to 22 g) arranged on one surface of the base sheet 21, a first terminal region 23, a second terminal region 24, and a first. It has an electrode wiring 25 and a second electrode wiring 26 (see FIGS. 1 and 2). Note that FIG. 2 is a bottom view of the heater sheet 14 seen from the back sheet 15 side, and is a view seen from the back surface when the light incident surface side is the front surface. That is, the seven heater portions 22, the first terminal region 23, the second terminal region 24, the first electrode wiring 25, and the second electrode wiring 26 are provided on the back surface side of the base sheet 21. Further, the heater sheet 14 has a rectangular shape in a plan view, and is obliquely arranged on a roof or the like so that the long sides are located vertically. When the solar cell module 10 with a built-in heater having the heater sheet 14 is arranged on the roof, for example, the lower side (heater portion 22a side) of the heater sheet 14 in FIG. 2 is the roof eaves side, and the upper side (heater portion 22g side) is the roof ridge. Be on the side.

The base sheet 21 has a rectangular shape in a plan view. The base material sheet 21 is usually a resin sheet. Examples of the material of the base material sheet 21 include the resin exemplified as the material of the surface protection panel 12, and polyethylene terephthalate is preferable.

Each of the seven heater portions 22 has a substantially band shape and is arranged along the long side of the base sheet 21. In FIG. 2, the seven heater portions 22 are arranged in parallel and separated from each other along the left-right direction.

Each heater portion 22 can be composed of, for example, a metal wire that is folded and stretched in multiple layers. The material of the metal wire is not particularly limited, and examples thereof include copper, aluminum, stainless steel, iron, and the like, but it is preferable that the metal wire is made of the same material as the first electrode wiring 25 and the second electrode wiring 26. For example, the metal wire constituting the heater portion 22, the second electrode wiring, and the second electrode wiring 26 can all be formed of copper. When the metal wire constituting the heater portion 22, the second electrode wiring, and the second electrode wiring 26 are made of the same material, the heater sheet 14 can be effectively manufactured by the etching method described later.

The width, diameter, and the like of the metal wire constituting the heater portion 22 are not particularly limited, and can be appropriately set according to the desired heat generation amount (output) of the heater. For example, when increasing the calorific value, the width and diameter of the metal wire can be reduced to increase the resistance.

The output of each heater unit 22 may be the same or different. As described above, in the solar cell module 10 with a built-in heater, it is required to sufficiently heat the lower end edge. Therefore, it is preferable to design so that the outputs of the heater portions 22a and the heater portions 22g at both ends that can be arranged on the lower end edge are large.

In the solar cell module 10 with a built-in heater, the heater portions 22c to 22g are arranged at regular intervals. Therefore, for example, the total area of the heater portion (the ratio of the total area in which the heater portion is arranged on one surface of the heater sheet) is smaller than that of the conventional solar cell module 100 with a built-in heater in FIG. 4, and as a result, the total area of the heater portion is smaller. Power consumption can be suppressed. The lower limit of the separation distance between the heater portions 22c to 22g is, for example, 20 mm, preferably 30 mm, and more preferably 40 mm. By setting the separation distance to be equal to or greater than the lower limit, power consumption can be further suppressed. On the other hand, as the upper limit of this separation distance, 60 mm is preferable, 50 mm is more preferable, and 45 mm is further preferable. A sufficient snowmelt function can be ensured by setting the separation distance to be equal to or less than the upper limit.

The upper limit of the distance L between one long side (lower long side in FIG. 2) of the base material sheet 21 and the heater portion 22a arranged at the edge on the long side of this one is preferably 10 mm, preferably 8 mm. Is more preferable, and 6 mm is further preferable. By setting the distance L short in this way, the lower end edge of the solar cell module 10 with a built-in heater can be heated more sufficiently, and the snowmelt function can be further enhanced. The lower limit of this distance L is, for example, 1 mm and may be 2 mm.

The first terminal region 23 is a region arranged on one side (left side in FIG. 2) of a pair of short sides of the base sheet 21. The first electrode wiring 25 and the second electrode wiring 26 are connected to the first terminal region 23, and the back sheet 15 is penetrated from the back surface side (lower side in FIG. 1) of the solar cell module 10 with a built-in heater. The terminal of one electrode (not shown) and the terminal of the second electrode (not shown) are configured to be exposed.

On the other hand, the second terminal region 24 is a region arranged on the other side (right side in FIG. 2) of the pair of short sides of the base sheet 21. The first electrode wiring 25 and the second electrode wiring 26 are also connected to the second terminal region 24, and the back sheet 15 is penetrated from the back surface side (lower side in FIG. 1) of the solar cell module 10 with a built-in heater. The terminal of one electrode (not shown) and the terminal of the second electrode (not shown) are configured to be exposed.

As described above, the first terminal region 23 and the second terminal region 24 are regions configured to take out the terminal of the first electrode and the terminal of the second electrode, respectively, from the back surface side of the solar cell module 10 with a built-in heater. .. In the solar cell module 10 with a built-in heater, since the two terminal regions (first terminal region 23 and the second terminal region 24) are provided in this way, a plurality of solar cell modules with built-in heaters 10 are arranged side by side. When arranged, a plurality of heater sheets 14 are connected in parallel by connecting the terminals of the first electrode and the terminals of the second electrode that are adjacent to each other.

The first electrode wiring 25 includes a first electrode edge portion 251 and seven first electrode heater portion connecting portions 252 (252a to 252 g), a first electrode first terminal region connecting portion 253, and a first electrode second terminal region. It has a connecting portion 254.

The first electrode end edge portion 251 is arranged on one side (left side in FIG. 2) of a pair of short sides of the base sheet 21. The first electrode edge portion 251 is linear and is provided along the left short side of the base sheet 21.

The seven first electrode heater portion connecting portions 252 (252a to 252 g) are portions that connect the first electrode end edge portion 251 and one end (left end in FIG. 2) of the seven heater portions 22a to 22 g, respectively.

The first electrode first terminal region connecting portion 253 is a portion connecting the first electrode end edge portion 251 and the first terminal region 23.

The seven first electrode heater portion connecting portions 252 and the first electrode first terminal region connecting portion 253 are short length portions extending from the linear first electrode end edge portion 251.

The first electrode second terminal region connecting portion 254 is a portion connecting the first electrode end edge portion 251 and the second terminal region 24. The first electrode second terminal region connecting portion 254 extends from the linear first electrode edge portion 251 and is connected to the second terminal region 24 through between the heater portion 22a and the heater portion 22b. ..

The second electrode wiring 26 includes a second electrode edge portion 261, seven second electrode heater portion connecting portions 262 (262a to 262 g), a second electrode first terminal region connecting portion 263, and a second electrode second terminal region. It has a connecting portion 264.

The second electrode end edge portion 261 is arranged on the other side (right side in FIG. 2) of the pair of short sides of the base sheet 21. The second electrode edge portion 261 extends from the linear portion along the right short side of the base sheet 21 and between the heater portion 22b and the heater portion 22c, and further extends from the linear portion. It has an L-shaped branching portion that is bent and extended to the 22b side (lower side in FIG. 2).

The seven second electrode heater portion connecting portions 262 (262a to 262 g) are portions that connect the second electrode end edge portion 261 and the other ends (right end in FIG. 2) of the seven heater portions 22a to 22 g, respectively. ..

The second electrode first terminal region connecting portion 263 is a portion connecting the second electrode end edge portion 261 and the first terminal region 23. The second electrode first terminal region connecting portion 263 extends from the L-shaped portion of the second electrode end edge portion 261, passes between the heater portion 22b and the heater portion 22c, and is connected to the first terminal region 23. ing.

The second electrode second terminal region connecting portion 264 is a portion extending from the L-shaped portion of the second electrode end edge portion 261 and connecting the second electrode end edge portion 261 and the second terminal region 24.

The seven second electrode heater portion connecting portions 262 and the second electrode second terminal region connecting portion 264 are short length portions extending from the second electrode end edge portion 261.

As described above, the first electrode second terminal region connecting portion 254 is arranged between the heater portion 22a and the heater portion 22b. Further, the second electrode first terminal region connecting portion 263 is arranged between the heater portion 22b and the heater portion 22c.

The material of the first electrode wiring and the second electrode wiring is not particularly limited as long as it has conductivity, but metals such as copper, aluminum, stainless steel, and iron are preferable, and copper is more preferable.

The first electrode wiring 25 (particularly, the first electrode edge portion 251 and the first electrode second terminal region connecting portion 254) and the second electrode wiring 26 (particularly, the second electrode edge portion 262 and the second electrode). As the lower limit of the width of the electrode first terminal region connecting portion 263), 10 mm is preferable, and 20 mm is more preferable. By setting the width of each wiring to the above lower limit or more, the conductivity can be improved. On the other hand, as the upper limit of the width, 50 mm is preferable, 40 mm is more preferable, and 30 mm is further preferable. By setting the width of each wiring to be equal to or less than the above upper limit, it is possible to secure a sufficiently wide arrangement area for the heater unit 22.

The average thickness of the first electrode wiring 25 and the second electrode wiring 26 is preferably, for example, 5 μm or more and 100 μm or less. Further, particularly when copper is used as the material, 5 μm or more and 20 μm or less is more preferable, and 10 μm or more and 14 μm or less is further preferable. Sufficient conductivity can be ensured by setting the average thickness of each wiring to be equal to or higher than the above lower limit. On the other hand, by setting the average thickness of each wiring to be equal to or less than the above upper limit, the thickness of the solar cell module 10 with a built-in heater can be reduced.

In the heater sheet 14 of the solar cell module 10 with a built-in heater, the first electrode wiring 25 and the second electrode wiring 26 connect seven heater portions 22a to 22g in parallel, and the first terminal region 23 and the second terminal, respectively. It is connected to the area 24. Further, a heater portion 22a is arranged on one edge portion (lowermost portion in FIG. 2) of the pair of long sides of the base material sheet 21, and is further on the edge side (lower side in FIG. 2) than the heater portion 22a. The first electrode wiring 25 and the second electrode wiring 26 are not arranged. Therefore, according to the solar cell module 10 with a built-in heater, when the solar cell module 10 with a built-in heater is installed so that the side provided with the heater portion 22a is on the lower side, the lower end edge can be sufficiently heated. , Can exert a good snow melting function. In the heater sheet 14 of the solar cell module 10 with a built-in heater, the heater portion 22g is arranged on the other edge of the pair of long sides of the base sheet 21 (the uppermost portion in FIG. 2), and the heater portion is provided. The first electrode wiring 25 and the second electrode wiring 26 are not arranged on the edge side (upper side in FIG. 2) of 22 g. Therefore, even when the solar cell module 10 with a built-in heater is installed so that the side provided with the heater portion 22g is on the lower side, the lower end edge (end edge on the heater portion 22g side) can be sufficiently heated. , Can exert a good snow melting function.

As the power source for the heater sheet 14 of the solar cell module 10 with a built-in heater, an AC power source or a DC power source may be used. In the case of a DC power supply, one of the first electrode wiring 25 and the second electrode wiring 26 is a positive electrode, and the other is a negative electrode. In addition, for example, it may be configured to operate with a direct current from a solar cell under specific conditions while being based on an AC power supply.

(Heater sheet 14')
The solar cell module with a built-in heater according to another embodiment of the present invention includes the heater sheet 14'of FIG. The heater built-in solar cell module is the same as the heater built-in solar cell module 10 of FIG. 1 except that the heater sheet 14'of FIG. 3 is provided instead of the heater sheet 14 of FIG.

In the heater sheet 14'of FIG. 3, the first electrode heater portion connecting portion 252e to 252g that connects the first electrode edge portion 251 and one end of each of the upper three heater portions 22e to 22g in FIG. 3 is cut off. It is the same as the heater sheet 14 of FIG. 2 except that the heater sheet 14 is used.

In the heater sheet 14', the first electrode heater portion connecting portions 252e to 252g are cut off, so that no current flows through the upper three heater portions 22e to 22g. For example, when installing in an area where the amount of snow is not so large, it may not be necessary to heat the entire surface. Therefore, by using a solar cell module with a built-in heater equipped with such a heater sheet 14', snow melting can be achieved. Power consumption can be suppressed. The number of first electrode heater unit connecting portions 252 to be cut is not limited. However, in order to function as a heater sheet, at least one of the plurality of first electrode heater unit connecting portions 252 is not cut. Further, as will be described later, the heater sheet 14'with such a structure can be efficiently and highly productively manufactured by a manufacturing method using etching.

<Manufacturing method of solar cell module with built-in heater>
The method for manufacturing the solar cell module 10 with a built-in heater is not particularly limited, but it can be suitably manufactured by the following method. That is, one embodiment of the present invention is a method for manufacturing the solar cell module with a built-in heater, which is a metal laminated sheet including the base sheet and a metal layer laminated on one surface of the base sheet. A step of removing a part of the metal layer by etching is provided, and the plurality of heater portions, the first electrode wiring, and the second electrode wiring are formed from the metal layer by the etching.

Examples of the metal laminated sheet include a sheet in which a copper layer (copper foil) as a metal layer is laminated on the surface of a polyethylene terephthalate sheet as a base material sheet. By masking and etching a part of the surface of the metal layer on such a metal laminated sheet, the unmasked part of the metal layer is removed. The etching method is not particularly limited, and a known wet etching method or the like can be adopted.

By such an etching method, a plurality of heater portions made of metal wires, the first electrode wiring and the second electrode wiring can be formed on the base material sheet, and the heater sheet can be effectively obtained.

Further, also in the case of manufacturing the heater sheet 14'of FIG. 3, the heater sheet 14 of FIG. 2 can be manufactured once and efficiently manufactured using the same mask pattern by cutting a predetermined portion of the wiring. can. As a method for cutting the wiring, a known method such as a laser can be used. The heater sheet 14'of FIG. 3 may be obtained by direct etching using a mask corresponding to the shape of the heater sheet 14'of FIG.

Except for the method for manufacturing the heater sheet, it can be manufactured in the same manner as the conventionally known solar cell module with a built-in heater. That is, for example, a surface protection panel, a solar cell, a heater sheet, and a back sheet can be laminated via a sealing material to obtain a laminated body, which can be manufactured by providing a frame.

<Other embodiments>
The present invention is not limited to the above-described embodiment, and the configuration may be changed without changing the gist of the present invention. For example, the number of a plurality of heater portions in the heater sheet is not particularly limited as long as it is a plurality. Further, for example, when the heater sheet has the function of a back sheet, the solar cell module with a built-in heater of the present invention may not be provided with the back sheet. Further, the frame may be provided so as to cover the entire side surface of the laminated body. Further, unlike the heater sheet 14'in FIG. 3, at least one of the plurality of second electrode heater unit connecting portions may be cut off.

The solar cell module with a built-in heater of the present invention can be suitably used as a solar cell module installed in an area with a large amount of snowfall.

10 Solar cell module with built-in heater 11 Laminated body 12 Surface protection panel 13 Solar cell cell 14, 14'Heater sheet 15 Back sheet 16 Frame 17a to 17c Encapsulant 21 Base material sheet 22 (22a to 22g) Heater part 23 1st terminal Area 24 2nd terminal area 25 1st electrode wiring 251 1st electrode end edge part 252 (252a to 252g) 1st electrode heater part connecting part 253 1st electrode 1st terminal area connecting part 254 1st electrode 2nd terminal area connecting part Part 26 2nd electrode wiring 261 2nd electrode end edge part 262 (262a to 262g) 2nd electrode heater part connecting part 263 2nd electrode 1st terminal area connecting part 264 2nd electrode 2nd terminal area connecting part 100 Heater sheet 101 Base sheet 102 Heater part 103 1st terminal area 104 2nd terminal area 105 1st electrode wiring 106 2nd electrode wiring

Claims (7)

A solar cell module with a built-in heater having a rectangular stack in a plan view in which a surface protection panel, a solar cell, and a heater sheet are laminated in this order.
The above heater sheet
It has a rectangular base sheet in a plan view, and a plurality of heater portions, a first terminal region, a second terminal region, a first electrode wiring, and a second electrode wiring arranged on one surface of the base sheet. death,
The first electrode wiring and the second electrode wiring are connected to the plurality of heater portions in parallel, and are connected to the first terminal region and the second terminal region, respectively.
Terminals connected to the first electrode wiring and terminals connected to the second electrode wiring are provided at the respective positions of the first terminal region and the second terminal region, respectively.
One of the plurality of heater portions is arranged on at least one edge of the pair of long sides of the base material sheet, and the first electrode wiring is further on the edge side of the one heater portion. And the above second electrode wiring is not arranged,
The terminal connected to the first electrode wiring and the terminal connected to the second electrode wiring are provided so as to be exposed on the back surface side of the heater built-in solar cell module. The plurality of heater portions are substantially strip-shaped and are arranged along the long sides of the base material sheet.
The first terminal region is arranged on one side of a pair of short sides of the base material sheet.
The second terminal region is arranged on the other side of the pair of short sides of the base material sheet.
The first electrode wiring is
A first electrode edge portion arranged on one edge of a pair of short sides of the base material sheet,
A plurality of first electrode heater unit connecting portions that connect the first electrode end edge portion and one end of the plurality of heater portions, respectively.
The first electrode first terminal region connecting portion connecting the first electrode end edge portion and the first terminal region, and the first electrode second connecting the first electrode end edge portion and the second terminal region. Has a terminal area connection
The second electrode wiring is
A second electrode edge portion arranged on the other edge of the pair of short sides of the base material sheet,
A plurality of second electrode heater section connecting portions that connect the second electrode edge portion and the other ends of the plurality of heater portions, respectively.
The second electrode first terminal region connecting portion connecting the second electrode end edge portion and the first terminal region, and the second electrode second connecting the second electrode end edge portion and the second terminal region. Has a terminal area connection
According to claim 1, the first electrode second terminal region connecting portion and the second electrode first terminal region connecting portion are respectively arranged between any two heater portions of the plurality of heater portions. The above-mentioned solar cell module with a built-in heater. The solar cell module with a built-in heater according to claim 2, wherein at least one of the plurality of first electrode heater unit connecting portions and the plurality of second electrode heater unit connecting portions is disconnected. The solar cell module with a built-in heater according to claim 1, claim 2 or claim 3, wherein the width of the first electrode wiring and the second electrode wiring is 10 mm or more and 50 mm or less. One of claims 1 to 4, wherein the distance between one long side of the base material sheet and the one heater portion arranged on the edge portion on the long side of the one is 10 mm or less. The solar cell module with a built-in heater described in. The solar cell module with a built-in heater according to any one of claims 1 to 5, further comprising a metal frame covering at least the long side side surface of the laminated body. The method for manufacturing a solar cell module with a built-in heater according to any one of claims 1 to 6.
A step of removing a part of the metal layer in the metal laminated sheet including the base sheet and the metal layer laminated on one surface of the base sheet by etching is provided.
A method for manufacturing a solar cell module with a built-in heater, which forms the plurality of heater portions, the first electrode wiring, and the second electrode wiring from the metal layer by the etching.

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