TWI534239B - Photovoltaic module and adhesive tape thereof - Google Patents

Description

Solar module and its tape

The invention relates to a solar module, and in particular to a solar module and a tape for fixing a solar cell.

As the oil stock has decreased year by year, the energy crisis has become the focus of common concern around the world, so the development of alternative energy sources cannot be delayed. Among the many alternative energy sources, solar energy has the inexhaustible and inexhaustible advantages, so it has always been the focus of attention.

Current methods of collecting solar energy are usually implemented using solar modules. Solar modules can be installed on the roof of a building to receive sunlight and generate electricity. The solar module may include at least a substrate, a plurality of tapes, a plurality of solar cells, and a light transmissive protection structure. The solar cells can be disposed on the substrate at intervals, and each tape can adhere to two adjacent solar cells. The light transmissive protection structure can cover the solar cell.

Generally, the color of the tape is white to reflect the light to the upper surface of the light-transmitting protective structure, and the upper surface of the light-transmitting protective structure can reflect the light reflected by the tape to the solar cell, thereby improving the light receiving of the solar cell. the amount. However, when the solar module passes long-term sunshine, the tape is often It will be yellowed, so that the reflection ability is reduced, so that the amount of light received by the solar cell is reduced.

In order to increase the amount of light received by the solar cell, some manufacturers have omitted the tape of the solar module, and the high-reflection sheet is attached to the lower surface of the light-transmitting protective structure. However, this highly reflective sheet reflects light only in the area below the gap of the solar cell, but wastes other areas of the highly reflective sheet. In addition, some manufacturers have made some light-transmissive protective structures under the solar cells to be made of white materials. However, at the time of production, the white material easily overflows to cover the light-receiving surface of the solar cell, and instead reduces the amount of light received by the solar cell.

In view of the above, an object of the present invention is to increase the amount of light received by a solar cell.

In order to achieve the above object, according to an embodiment of the present invention, an adhesive tape comprises an ultraviolet resistant substrate, a reflective structure, and two adhesive layers. The reflective structure is disposed on the ultraviolet resistant substrate. The two adhesive layers are disposed on the ultraviolet resistant substrate and are located on opposite sides of the reflective structure. Each adhesive layer is used to adhere at least one solar cell.

According to another embodiment of the present invention, a solar module includes at least one first solar cell, at least one second solar cell, and a tape. The second solar cell is separated from the first solar cell by a gap. The tape comprises an anti-UV substrate, a reflective structure and two adhesive layers. The reflective structure is disposed on the ultraviolet resistant substrate and is located in the gap. Two adhesive layers The system is disposed on the ultraviolet resistant substrate, and the two adhesive layers are located on opposite sides of the reflective structure. The two adhesive layers adhere to the first solar cell and the second solar cell, respectively.

In the above embodiment, since the tape contains the ultraviolet-resistant substrate, even if the tape is subjected to long-term sunlight, the yellowing phenomenon is less likely to occur, and the effect of reflection can be maintained to increase the amount of light received by the solar cell after long-term use. In addition, a reflective structure is disposed above the ultraviolet resistant substrate, which can help the reflection of light, thereby increasing the amount of light received by the solar cell.

The above description is only for explaining the problems to be solved by the present invention, the technical means for solving the problems, the effects thereof, and the like, and the specific details of the present invention will be described in detail in the following embodiments and related drawings.

100‧‧‧First solar cell

102‧‧‧The first light-receiving surface

104‧‧‧First backlight

200‧‧‧Second solar cell

202‧‧‧Second light-receiving surface

204‧‧‧second backlight

300‧‧‧ Tape

310‧‧‧Anti-UV substrate

312‧‧‧ bearing surface

314‧‧‧Central area

316‧‧‧ surrounding area

318‧‧‧ surrounding area

320‧‧‧Reflective structure

322‧‧‧ cone

324‧‧‧ top surface

330‧‧‧Adhesive layer

340‧‧‧Adhesive layer

400‧‧‧Transparent coating

401‧‧‧ top surface

402‧‧‧ bottom

500‧‧‧ glass

600‧‧‧ Tape

D1‧‧‧ length direction

D2‧‧‧width direction

L1‧‧‧Light

L2‧‧‧Light

G‧‧‧ gap

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. The description of the drawings is as follows: FIG. 1 is a top view of a solar module according to an embodiment of the present invention; 1 is a cross-sectional view of a solar module according to an embodiment of the present invention; FIG. 3 is a partial cross-sectional view of an adhesive tape according to an embodiment of the present invention; and FIG. 4 is a first view of an embodiment of the present invention. Top view of solar cell, second solar cell and tape.

The embodiments of the present invention are disclosed in the following drawings, and for the purpose of clarity However, it should be understood by those skilled in the art that the details of the invention are not essential to the details of the invention. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings. In addition, the dimensions of the various elements in the drawings are not shown in actual scale for the convenience of the reader.

FIG. 1 is a top plan view of a solar module according to an embodiment of the invention. As shown in FIG. 1, the solar module may include a first solar cell 100, a second solar cell 200, and a tape 300. The tape 300 can adhere to the first solar cell 100 and the second solar cell 200. After a long period of sunshine, the tape 300 often undergoes yellowing. This yellowing phenomenon is caused by long-term exposure to ultraviolet rays. Therefore, an embodiment of the present invention proposes the following technical solution to solve the yellowing phenomenon. Further, referring to FIG. 2, a cross-sectional view of a solar module according to an embodiment of the present invention is shown. As shown in FIG. 2, the tape 300 includes an ultraviolet resistant substrate 310, a reflective structure 320, and adhesive layers 330 and 340. The reflective structure 320 is disposed on the ultraviolet resistant substrate 310. The adhesive layers 330 and 340 are disposed on the ultraviolet resistant substrate 310 and are located on opposite sides of the reflective structure 320. The adhesive layer 330 adheres to the first solar cell 100, and the adhesive layer 340 adheres to the second solar cell 200.

In this embodiment, since the tape 300 contains an ultraviolet resistant substrate 310, it can prevent discoloration due to exposure to ultraviolet light. Therefore, even after the long-term sunshine of the tape 300, the phenomenon of yellowing is less likely to occur, so even after long-term sunshine, the amount of light reflected by the tape 300 to the first solar cell 100 and the second solar cell 200 does not deteriorate, but The amount of light received by the first solar cell 100 and the second solar cell 200 after long-term use is increased.

In some embodiments, the UV resistant substrate 310 is a substrate doped with an anti-UV adjuvant. The anti-UV assistant may comprise titanium dioxide (TiO ₂ ), titanium dioxide-ferric oxide mixture (TiO ₂ -Fe ₂ O ₃ ), magnesium fluoride (MgF ₂ ) or any combination thereof, but the present invention does not limit. The substrate of the ultraviolet resistant substrate 310 may be polyethylene terephthalate (PET), but the invention is not limited thereto. In some embodiments, the substrate of the ultraviolet resistant substrate 310 may be white PET to reflect light, but the invention is not limited thereto. It should be understood that the term "material may include A, B, C or any combination of the above" as used throughout the specification means that the material may be a mixture of A, B, C, A and B, a mixture of A and C, B and C. a mixture, or a mixture of A and B and C.

Since the reflective structure 320 is further disposed above the ultraviolet resistant substrate 310, it can help reflect light, thereby increasing the amount of light received by the first solar cell 100 and the second solar cell 200. More specifically, as shown in FIG. 2, the solar module may include a light transmissive cladding layer 400 and a glass 500. The light transmissive cladding layer 400 may encapsulate the first solar cell 100, the second solar cell 200, and the tape 300 therein. The light transmissive cladding layer 400 has a top surface 401 and a bottom surface 402. The top surface 401 is opposite the bottom surface 402 and the top surface 401 is further from the tape 300 than the bottom surface 402. The glass 500 is disposed on the top surface 401 of the light transmissive cladding layer 400. The first solar cell 100 has a first light receiving surface 102 and The first backlight surface 104. The first light receiving surface 102 is opposite to the first backlight surface 104. The second solar cell 200 has a second light receiving surface 202 and a second backlight surface 204. The second light receiving surface 202 is opposite to the second backlight surface 204. The adhesive layer 330 adheres to the first backlight surface 104, and the adhesive layer 340 adheres to the second backlight surface 204. The first light receiving surface 102 and the second light receiving surface 202 are both directed toward the top surface 401 of the light transmissive cladding layer 400.

When the light L1 passes through the glass 500 and enters the transparent cladding layer 400 from the top surface 401 of the transparent cladding layer 400, a portion of the light ray L1 may encounter the reflective structure 320, and the reflective structure 320 may reflect the partial light L1 to The top surface 401 of the light transmissive cladding layer 400. The portion of the light ray L1 can be reflected back and forth between the top surface 401 of the transparent cladding layer 400 and the reflective structure 320 and reflected to the first light receiving surface 102 of the first solar cell 100. Therefore, the reflective structure 320 can reflect the light L1 to the first light receiving surface 102 of the first solar cell 100, and increase the amount of light received by the first light receiving surface 102. Similarly, when the light L2 passes through the glass 500 and enters the transparent cladding layer 400 from the top surface 401 of the transparent cladding layer 400, a portion of the light ray L2 may encounter the reflective structure 320, and the reflective structure 320 may L2 is reflected to the top surface 401 of the light transmissive cladding layer 400. The portion of the light ray L2 can be reflected back and forth between the top surface 401 of the transparent cladding layer 400 and the reflective structure 320 and reflected to the second light receiving surface 202 of the second solar cell 200. Therefore, the reflective structure 320 can help reflect the light ray L2 to the second light receiving surface 202 of the second solar cell 200, and increase the amount of light received by the second light receiving surface 202.

3 is a partial cross-sectional view of the tape 300. As shown in FIG. 3, the top surface of the reflective structure 320 is undulating to facilitate reflection of light. For example, reflective structure 320 includes a plurality of cones 322. These cones 322 are disposed on the UV resistant substrate 310, and each cone 322 has a top surface 324. The top surfaces 324 of these cones 322 are contiguous and undulating. As such, when the light encounters the top surface 324 of the cone 322, the undulating top surface 324 can help reflect light.

In some embodiments, the material of the reflective structure 320 may be a UV-resistant reflective material to prevent the reflective structure 320 from being yellowed by ultraviolet radiation. For example, the material of the reflective structure 320 may include titanium dioxide (TiO ₂ ), titanium trioxide (Ti ₃ O ₅ ), tantalum pentoxide (Ta ₂ O ₅ ), or any combination thereof, but the present invention does not Limited.

In some embodiments, as shown in FIG. 3, the UV resistant substrate 310 has a bearing surface 312. The reflective structure 320 and the adhesive layers 330 and 340 are disposed on the bearing surface 312 of the ultraviolet resistant substrate 310. Further, the bearing surface 312 has a central region 314 and two peripheral regions 316 and 318. Peripheral regions 316 and 318 are located on opposite sides of central region 314. In other words, the central region 314 is located between the peripheral regions 316 and 318. The reflective structure 320 is disposed on the central region 314. The adhesive layer 330 is disposed on the peripheral region 316, and the adhesive layer 340 is disposed on the peripheral region 318. The peripheral region 316 is located below the first solar cell 100 (see FIG. 2), so that the adhesive layer 330 adheres to the first backlight surface 104 of the first solar cell 100. The peripheral region 318 is located below the second solar cell 200 (see FIG. 2), so that the adhesive layer 340 adheres to the second backlight surface 204 of the second solar cell 200. The central region 314 is located below the gap G between the first solar cell 100 and the second solar cell 200 to facilitate the reverse The radiation structure 320 reflects the light rays L1 and L2 entering the gap G to the first light receiving surface 102 of the first solar cell 100 and the second light receiving surface 202 of the second solar cell 200, respectively.

In the conventional solar module, each tape can only adhere to a single pair of solar cells. In other words, multiple pairs of solar cells are respectively adhered by different tapes, so when the solar module is laminated, the light is transmitted. When the material of the protective layer has not been cured, the uncured material easily flows to cause the solar cell to shift, resulting in inconsistent gaps between the solar cells. Therefore, one embodiment of the present invention proposes the following technical solutions to solve this problem. Specifically, referring to FIG. 4, a top view of the first solar cell 100, the second solar cell 200, and the tape 300 according to an embodiment of the present invention is shown. As shown in FIG. 4, the number of the first solar cells 100 is plural, and the number of the second solar cells 200 is also plural. The adhesive layer 330 can adhere to the first solar cells 100, and the adhesive layer 340 can adhere to the first Two solar cells 200. In other words, the first solar cell 100 and the second solar cell 200 are arranged in pairs, and one tape 300 can adhere to the first solar cell 100 and the second solar cell 200. In this way, even if the solar module is in the lamination process, the material of the transparent coating 400 (see FIG. 2) flows without being solidified, and the tape 300 can stably maintain the plurality of pairs of the first solar cells 100 and the first The relative positions of the two solar cells 200 prevent the first solar cell 100 and the second solar cell 200 from shifting due to the flow of the material of the light transmissive cladding layer 400.

In some embodiments, as shown in FIG. 4, the ultraviolet resistant substrate 310 may have a strip structure and have a length direction D1 and a width direction D2. The longitudinal direction D1 is substantially perpendicular to the width direction D2. The length direction D1 is parallel to the direction of the longest side of the ultraviolet resistant substrate 310. The plurality of first solar cells 100 are substantially aligned along the longitudinal direction D1. The plurality of second solar cells 200 are also substantially aligned along the length direction D1. In other words, the first solar cell 100 and the second solar cell 200 are arranged in the same direction and are parallel to the longest side of the ultraviolet resistant substrate 310. Therefore, the first solar cell 100 and the second solar cell 200 can adhere to the opposite longest sides of the ultraviolet resistant substrate 310 along the length direction D1 of the ultraviolet resistant substrate 310, thereby increasing the first adhesion of each adhesive tape 300. The number of solar cells 100 and second solar cells 200.

In some embodiments, as shown in FIG. 4, the direction in which the adhesive layers 330, 340 and the reflective structure 320 are arranged is substantially perpendicular to the longitudinal direction D1. In other words, the direction in which the adhesive layers 330, 340 and the reflective structure 320 are arranged is parallel to the width direction D2, that is, the adhesive layer 330, the reflective structure 320, and the adhesive layer 340 may be sequentially arranged along the width direction D2.

It should be understood that the term "substantially" as used throughout this specification is intended to modify any relationship that may vary slightly, but such minor variations do not alter the nature. For example, "the plurality of first solar cells 100 are substantially aligned along the longitudinal direction D1" except that the arrangement direction of the first solar cell 100 is completely parallel to the longitudinal direction D1, as long as the first solar cell 100 is On the opposite side of the tape 300 from the second solar cell 200, an embodiment in which the arrangement direction of the first solar cell 100 is slightly parallel to the longitudinal direction D1 may be included.

Please refer back to Figure 1, in some embodiments, the solar module The set may also include an adhesive tape 600. The tape 600 may be adhered to the first solar cell 100 separated by two phases, or the second solar cell 200 separated by two phases. The tape 600 and the tape 300 are both strip-like structures, and the length direction of the tape 600 is parallel to the width direction D2 of the tape 300. In other words, the longitudinal direction of the tape 600 is perpendicular to the longitudinal direction D1 of the tape 300, and the direction in which the tape 300 and the tape 600 are aligned is also perpendicular. That is, the tapes 300 are arranged laterally, and the tapes 600 are arranged longitudinally. As a result, the tape 300 and the tape 600 can firmly adhere to the first solar cell 100 and the second solar cell 200. The specific structure and material of the tape 600 are as described in the second and third figures and the aforementioned related paragraphs of the tape 300, and therefore will not be repeated.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧First solar cell

200‧‧‧Second solar cell

300‧‧‧ Tape

600‧‧‧ Tape

D1‧‧‧ length direction

D2‧‧‧width direction

G‧‧‧ gap

Claims (15)

An adhesive tape comprising: an ultraviolet resistant substrate; a reflective structure disposed on the ultraviolet resistant substrate; and two adhesive layers disposed on the ultraviolet resistant substrate, wherein the two adhesive layers are on opposite sides of the reflective structure, Each of the two adhesive layers is used to adhere at least one solar cell. The tape of claim 1, wherein a top surface of the reflective structure is undulating. The tape of claim 1, wherein the reflective structure comprises a plurality of cones disposed on the ultraviolet resistant substrate. The tape of claim 1, wherein the reflective structure is made of a material that is resistant to ultraviolet light. The tape of claim 4, wherein the material of the reflective structure comprises titanium dioxide, titanium trioxide, tantalum pentoxide or any combination thereof. The tape of claim 1, wherein the ultraviolet resistant substrate is a substrate doped with an anti-UV auxiliary agent, wherein the anti-UV auxiliary comprises titanium dioxide, titanium dioxide-ferric oxide mixture, magnesium fluoride or any combination thereof . A solar module comprising: at least one first solar cell; At least one second solar cell is separated from the first solar cell by a gap; and a tape comprising: an ultraviolet resistant substrate; a reflective structure disposed on the ultraviolet resistant substrate and located in the gap; and two adhesive layers, The two adhesive layers are disposed on opposite sides of the reflective structure, and the two adhesive layers respectively adhere the first solar cell and the second solar cell. The solar module of claim 7, wherein the number of the at least one first solar cell and the number of the at least one second solar cell are plural, and one of the two adhesive layers adheres to the first solar energy a battery, and the other of the two adhesive layers adheres to the second solar cells. The solar module of claim 7, wherein the ultraviolet resistant substrate has a length direction, the direction of arrangement of the two adhesive layers and the reflective structure is substantially perpendicular to the length direction, and the first solar cell systems are substantially along Aligned in the length direction, the second solar cells are substantially aligned along the length direction. The solar module of claim 7, further comprising: a transparent coating layer, the first solar cell and the second solar cell are coated therein, the transparent cladding layer has a top surface and a a bottom surface, the top surface being farther from the adhesive tape than the bottom surface; and a glass disposed on the top surface of the light transmissive cladding layer. The solar module of claim 7, wherein a top surface of the reflective structure is undulating. The solar module of claim 7, wherein the reflective structure comprises a plurality of cones disposed on the ultraviolet resistant substrate. The solar module of claim 7, wherein the reflective structure is made of a material that is resistant to ultraviolet light. The solar module of claim 13, wherein the material of the reflective structure comprises titanium dioxide, titanium trioxide, tantalum pentoxide or any combination thereof. The solar module of claim 7, wherein the ultraviolet resistant substrate is a substrate doped with an anti-UV auxiliary agent, wherein the anti-UV auxiliary comprises titanium dioxide, titanium dioxide-ferric oxide mixture, magnesium fluoride or the above random combination.