阅读说明：本技术 导电膜、光伏电池单元及光伏电池模块 (Conductive film, photovoltaic cell unit and photovoltaic cell module ) 是由 陈博斌 赖庆权 于 2018-06-15 设计创作，主要内容包括：本发明揭示一种导电膜、光伏电池单元及光伏电池模块；导光膜应用于串接相邻的二光伏电池；所述的导电膜包含至少一导线、一透光膜层、一透光胶层,透光膜层覆盖导线,透光胶层至少配置于导线和透光膜层之间。(The invention discloses a conductive film, a photovoltaic cell unit and a photovoltaic cell module; the light guide film is applied to two photovoltaic cells which are connected in series; the conductive film comprises at least one wire, a light-transmitting film layer and a light-transmitting adhesive layer, wherein the light-transmitting film layer covers the wire, and the light-transmitting adhesive layer is at least arranged between the wire and the light-transmitting film layer.)

1. A conductive film is applied to two photovoltaic cells which are connected in series and adjacent to each other, and is characterized by comprising:

at least one conductive line;

a light-transmitting film layer covering the wires; and

and the light-transmitting adhesive layer is at least arranged between the lead and the light-transmitting film layer so as to combine the lead and the light-transmitting film layer.

2. The conductive film of claim 1, wherein the light-transmissive adhesive layer is disposed over the light-transmissive film layer.

3. The conductive film of claim 1, wherein the conductive line is made of metal.

4. The conductive film of claim 1, wherein the light-transmissive film layer is selected from the group consisting of the following light-transmissive polymers: polyethylene terephthalate, polycarbonate, polymethylmethacrylate, and combinations thereof.

5. The conductive film according to claim 1, wherein the light-transmissive adhesive layer is acrylic adhesive or silicone adhesive.

6. A photovoltaic cell, comprising:

two photovoltaic cells having a light-receiving surface and a non-light-receiving surface opposite to the light-receiving surface; and

the conductive film according to claim 1, wherein a first end portion of the conductive film is disposed on the light-receiving surface of one of the photovoltaic cells, the conductive wire is in contact with at least one electrode on the light-receiving surface of the one of the photovoltaic cells, and a second end portion of the conductive film is bent inward after passing through the non-light-receiving surface of the other photovoltaic cell, so that the conductive wire is in contact with at least one electrode on the non-light-receiving surface of the other photovoltaic cell.

7. A photovoltaic cell, comprising:

a plurality of photovoltaic cells having a light-receiving surface and a non-light-receiving surface opposite to the light-receiving surface; and

the conductive film according to claim 2, wherein a first end portion of the conductive film is disposed on the light-receiving surface of one of the photovoltaic cells, the conductive wire is in contact with at least one electrode on the light-receiving surface of the one of the photovoltaic cells, the transparent adhesive layer at the first end of the conductive film is in contact with the light-receiving surface of the one of the photovoltaic cells, a second end portion of the conductive film is bent inward after passing through the non-light-receiving surface of the other of the photovoltaic cells, the conductive wire is in contact with at least one electrode on the non-light-receiving surface of the other of the photovoltaic cells, and the transparent adhesive layer at the second end portion of the conductive film is in contact with the non-light-receiving surface of the other of the photovoltaic cells.

8. A photovoltaic cell module, comprising:

a light-transmitting plate;

a back plate disposed opposite to the light-transmitting plate; and

a plurality of photovoltaic cells as claimed in claim 6 or 7 sandwiched between the light-transmitting plate and the back-sheet.

9. The photovoltaic cell module of claim 8, wherein the plurality of photovoltaic cells are connected in series.

10. The photovoltaic cell module of claim 9, wherein the plurality of photovoltaic cells are connected in parallel, and the photovoltaic cell module further comprises at least one bus connected to the plurality of photovoltaic cells.

Technical Field

The present invention relates to a conductive film, and more particularly, to a conductive film applied to two adjacent photovoltaic cells in a tandem photovoltaic cell unit.

Background

Fig. 1 shows a cross-sectional view of a conventional photovoltaic cell module 1. In fig. 1, a photovoltaic cell module 1 includes a light-transmitting sheet 12, a back sheet 14, and a photovoltaic cell unit 16. The light-transmitting plate 12 has light transparency, and the back plate 14 is disposed opposite the light-transmitting plate 12. The photovoltaic cell unit 16 is sandwiched between the light-transmitting plate 12 and the back plate 14, and includes a plurality of photovoltaic cells 162 and a plurality of solder strips (cell ribbons) 164. Each photovoltaic cell 162 has a light-receiving surface 1620 and a non-light-receiving surface 1622 opposite the light-receiving surface 1620.

The solder strip 164 is made of an alloy such as copper and indium; specifically, the solder ribbon 164 includes a first portion 1640, a second portion 1642, and a third portion 1644. The first portion 1640 is disposed on the light-receiving surface 1620 of one of the photovoltaic cells 162 to electrically connect to the front electrode pattern (not shown) of the photovoltaic cell 162. A third portion 1644 of the solder ribbon 164 is disposed on the non-light-receiving surface 1622 of another photovoltaic cell 162 to form an electrical connection with a back electrode pattern (not shown) of the photovoltaic cell 162. A second portion 1642 of the solder ribbon 164 connects the first portion 1640 and the third portion 1644. In other words, each solder ribbon 164 is used to connect any two adjacent photovoltaic cells 162 in series.

As described above, the solder ribbon 164 is mainly made of copper or indium alloy, and has no flexibility, so that the solder ribbon 164 is easily separated from the photovoltaic cell 162 due to collision or extrusion during transportation or assembly, or the junction between the solder ribbon 164 and the photovoltaic cell 162 is warped due to exposure in a high-temperature environment for a long time, thereby causing cracking or breaking.

Disclosure of Invention

In view of overcoming the problems of the prior art described above, an object of the present invention is to provide a conductive film, a photovoltaic cell, and a photovoltaic cell module.

The invention provides a conductive film which is applied to two photovoltaic cells which are connected in series; the conducting film comprises one or more wires, a light-transmitting film layer and a light-transmitting adhesive layer, wherein the light-transmitting film layer covers the wires, and the light-transmitting adhesive layer is at least arranged between the one or more wires and the light-transmitting film layer.

According to another aspect of the present invention, a photovoltaic cell unit includes a plurality of photovoltaic cells and the conductive film of the previous embodiment, the photovoltaic cells have a light-receiving surface and a non-light-receiving surface opposite to the light-receiving surface; a first end part of the conductive film is arranged on the light receiving surface of one of the photovoltaic cells, so that the conductive wire is in contact with one or more electrodes on the light receiving surface of one of the photovoltaic cells, and a second end part of the conductive film is bent inwards after passing through the non-light receiving surface of the other photovoltaic cell, so that the conductive wire is in contact with one or more electrodes on the non-light receiving surface of the other photovoltaic cell.

The invention also provides a photovoltaic cell unit, which comprises a plurality of photovoltaic cells and the conductive film; the photovoltaic cell is provided with a light receiving surface and a non-light receiving surface opposite to the light receiving surface; a first end part of the conductive film is arranged on the light receiving surface of one of the photovoltaic cells, the lead is in contact with one or more electrodes on the light receiving surface of one of the photovoltaic cells, the light-transmitting glue layer at the first end of the conductive film is in contact with the light receiving surface of one of the photovoltaic cells, a second end part of the conductive film is bent inwards after passing through the non-light receiving surface of the other photovoltaic cell, the lead is in contact with one or more electrodes on the non-light receiving surface of the other photovoltaic cell, and the light-transmitting glue layer at the second end part of the conductive film is in contact with the non-light receiving surface of.

The invention further provides a photovoltaic cell module, which comprises a light-transmitting plate, a back plate and the photovoltaic cell units; the back plate is configured relative to the light transmitting plate, and the photovoltaic cell unit is clamped between the light transmitting plate and the back plate.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

Fig. 1 shows a cross-sectional view of a conventional photovoltaic cell module;

FIG. 2 shows a top view of a photovoltaic cell unit according to an embodiment of the present invention;

FIG. 3 shows a cross-sectional view of a photovoltaic cell unit in accordance with one embodiment of the present invention;

FIG. 4A shows a cross-sectional view of a photovoltaic cell in accordance with one embodiment of the present invention;

FIG. 4B shows a cross-sectional view of a photovoltaic cell unit according to another embodiment of the present invention;

fig. 5 shows a cross-sectional view of a photovoltaic cell module according to an embodiment of the present invention; and

fig. 6 shows a top view of a photovoltaic cell module according to an embodiment of the invention.

Wherein the reference numerals

1 … photovoltaic cell module

12. 38 … light-transmitting plate

14. 40 … backboard

16 … photovoltaic cell unit

162. 32 … photovoltaic cell

1620. 322 … receiving surface

1622. 324 … non-receiving surface

164 … solder strip

1640 … first part

1642 … second part

1644 … third part

3 … photovoltaic cell module

30 … photovoltaic cell unit

3220 … (light receiving surface) electrode

3240 … (non-light-receiving surface) electrode

34 … conductive film

340 … first end

341 … second end

342 … light-transmitting film layer

344 … light-transmitting glue layer

346 … conducting wire

42 … bus

Detailed Description

Fig. 2 shows a top view of a photovoltaic cell 30 according to an embodiment of the invention, and fig. 3-4B respectively show cross-sectional views of the photovoltaic cell according to an embodiment of the invention. In fig. 2-4B, the photovoltaic cell unit 30 includes two photovoltaic cells 32 arranged along a predetermined direction, and a conductive film 34. The photovoltaic cell 32 has a light receiving surface 322 and a non-light receiving surface 324 opposite to the light receiving surface 322, and the light receiving surface 322 receives light.

The conductive film 34 is applied to connect two adjacent photovoltaic cells 32 in series; the conductive film 34 includes a light-transmissive film layer 342, a light-transmissive adhesive layer 344, and a conductive line 346 stacked in sequence. The transparent film layer 342 is flexible and can be made of a heat-resistant transparent polymer to reduce yellowing (yellow) caused by sunlight or heat. For example, the light transmissive film layer 342 may be selected from the following light transmissive polymers: polyethylene terephthalate (PET), Polycarbonate (PC), Polymethylmethacrylate (PMMA), and combinations thereof. The light-transmitting adhesive layer 344 may be acrylic adhesive or silicone adhesive.

The conductive film 34 may include one or more conductive lines, and when the conductive film includes a plurality of conductive lines, the long side direction of the conductive lines 346 is parallel to the predetermined direction, and the plurality of conductive lines 346 are arranged in parallel along the short side direction thereof. The number of the wires 346 may be equal to the number of the light-receiving-surface electrodes 3220 and the non-light-receiving-surface electrodes 3240 on each photovoltaic cell 32; in this embodiment, two conductive lines 346 are taken as an example, and the distance between the conductive lines 346 is substantially the same as the distance between the light-receiving surface electrodes 3220 (or the non-light-receiving surface electrodes 3240).

It should be particularly noted that, if the conductive film 34 is used to connect two adjacent photovoltaic cells 32 connected in series, the number of the conductive wires 346 is equal to the number of the light receiving surface electrodes 3220 or the non-light receiving surface electrodes 3240 of each photovoltaic cell 32; if the conductive film 34 is used for combining a plurality of parallel (connected) photovoltaic cells 32 in addition to the adjacent two photovoltaic cells 32 connected in series, the number of the conducting wires 346 may be equal to the number of the light receiving surface electrodes 3220 or the non-light receiving surface electrodes 3240 of the plurality of parallel photovoltaic cells 32. For example, when the conductive film 34 is used to combine 4 photovoltaic cells 32 arranged in a 2 × 2 matrix, and each photovoltaic cell 32 has two light receiving surface electrodes 3220 or non-light receiving surface electrodes 3240, the conductive film 34 includes 4 parallel conductive wires 346. The wire 346 may be fabricated from a single layer of metal or multiple layers of metal (e.g., tin-copper plated), wherein the multiple layers of metal have greater durability than the single layer of metal.

The light-transmitting adhesive layer 344 is disposed between the light-transmitting film layer 342 and the wires 346; where the conductive lines 346 are disposed, the light-transmissive adhesive layer 344 is used to bond the light-transmissive film layer 342 and the conductive lines 346 (as shown in fig. 3); where the wires 346 are not disposed, the transparent adhesive layer 344 is used to bond the transparent film layer 342 and the photovoltaic cell 32, as shown in fig. 4A or fig. 4B, so as to prevent the wires 346 from being displaced during transportation. Referring to fig. 4A, the thickness of the transparent adhesive layer 344 at the position where the conductive film 34 is not provided with the conductive wires 346 is greater than the thickness of the conductive film 34 where the conductive wires 346 are provided; in other words, in fig. 4A, the wires 346 may be embedded in the light-transmissive adhesive layer 344. In fig. 4B, the transparent adhesive layer 344 has a uniform thickness (i.e., a constant thickness), the conductive wires 346 are disposed on the transparent adhesive layer 344, and when the conductive film 34 contacts the photovoltaic cell 32, the portion of the conductive film 34 not provided with the conductive wires 346 is recessed toward the photovoltaic cell 32 at a larger angle (relative to fig. 4A) so that the transparent adhesive layer 344 can contact the photovoltaic cell 32.

Please refer to fig. 3 again; when connecting two photovoltaic cells 32 in series, first, the conducting wires 346 of the first end 340 of the conductive film 34 are aligned and contacted with the electrodes 3220 of the light receiving surface 322 on one of the photovoltaic cells 32, and then the light-transmitting adhesive layer 344 where the conducting wires 346 are not disposed in the conductive film 34 is contacted with the light receiving surface 322 of one of the photovoltaic cells 30. Due to the flexibility of the conductive film 34, the second end 341 of the conductive film 34 may be bent downward between two adjacent photovoltaic cells 32 and pass through the non-light-receiving surface 324 of another photovoltaic cell 32, and then bent inward to allow the conductive wire 346 of the second end 341 of the conductive film 34 to contact the electrode 3240 of the non-light-receiving surface 324 of another photovoltaic cell 30, and finally, the transparent adhesive layer 344 where the conductive wire 346 is not disposed at the second end 341 of the conductive film 34 is contacted with the non-light-receiving surface 324 of the photovoltaic cell 30, thereby completing the serial connection of the two photovoltaic cells 32.

Then, after the conducting wires 346 of the first end 340 of the other conducting film 34 are aligned and contacted with the electrodes 3220 of the light receiving surface 322 of the other photovoltaic cell 32, the light-transmitting adhesive layer 344 where the conducting wires 346 are not disposed on the conducting film 34 is contacted with the light receiving surface 322 of one of the photovoltaic cells 30; then, the second end 341 of the conductive film 34 may be bent downward between two adjacent photovoltaic cells 32 and pass through the non-light-receiving surface 324 of another photovoltaic cell 32, and then bent inward to allow the conductive wire 346 of the second end 341 of the conductive film 34 to contact the electrode 3240 of the non-light-receiving surface 324 of another photovoltaic cell 30, and finally allow the transparent adhesive layer 344 where the conductive wire 346 is not disposed at the second end of the conductive film 34 to contact the non-light-receiving surface 324 of the photovoltaic cell 30, thereby completing the serial connection of the three photovoltaic cells 32.

In summary, the series connection of the plurality of photovoltaic cells 32 can be completed by repeating the process of contacting the first end 340 of the conductive film 34 with the electrode 3220 of the light receiving surface 322 of one photovoltaic cell 32, bending the second end 341 of the conductive film 34 downward between two adjacent photovoltaic cells 32, passing through the non-light receiving surface 324 of another photovoltaic cell 32, and then bending inward to contact the electrode 3240 of the non-light receiving surface 324 of another photovoltaic cell.

Thereafter, the light-transmitting plate 38 may be disposed on the light-receiving surface 322 of the string of photovoltaic cells 32, and the back-sheet 40 may be disposed on the non-light-receiving surface 324 of the string of photovoltaic cells 32 to form the photovoltaic cell module 3, as shown in fig. 5. The light-transmitting plate 38 may be, for example, strengthened glass; the back sheet 40 may be, for example, tempered glass; of course, the back sheet 40 is not excluded from being a copper sheet to enhance the heat dissipation capability of the photovoltaic cell module 3. The photovoltaic cell module 3 may comprise a series of one or more strings of photovoltaic cells 32, and when the photovoltaic cell module 3 comprises a series of strings of photovoltaic cells 32, the strings of rows of these photovoltaic cells 32 may be formed in parallel by a bus 42.

In summary, the light-transmitting film layer 342 and the light-transmitting adhesive layer 344 of the present invention are made of materials that are resistant to heat up to at least 90 degrees, so that even if the photovoltaic cell unit 30 is exposed to a high temperature environment for a long time, the junction between the conductive film 34 and the photovoltaic cell 32 is not easily warped. Secondly, due to the flexibility of the light-transmitting film layer 342, the problem of separation of the conductive film 34 from the cell 34 due to collision or extrusion during transportation or assembly of the photovoltaic cell 30 can be prevented, and even if the junction of the conductive film 34 and the photovoltaic cell 32 is warped, the problem of cracking or breaking can not occur.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.