Electrode for photovoltaic cell, photovoltaic cell and photovoltaic cell assembly

Abstract

The present invention discloses an electrode for a photovoltaic cell, a photovoltaic cell and a photovoltaic cell assembly, wherein the electrode comprises a composite film having a conductive property and having an adhesive effect after being heated, and a plurality of parallel metal wires embedded in the composite film by bonding, wherein each metal wire partially protrudes from the composite film. The electrode for the photovoltaic cell has a simple structure, so that the manufacturing process of the electrode is also simple. Furthermore, a rough surface or an embossed surface is used on one end surface of the composite film in contact with the photovoltaic cell, so that the relative displacement between the composite film and the metal wire and the photovoltaic cell can be reduced during the electrode manufacturing process. A composite film having conductivity can also be used to reduce resistance and improve the performance of the photovoltaic assembly, or a composite film having a certain color can be used to give the photovoltaic product a personalized appearance.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production and manufacturing, and in particular to an electrode for a photovoltaic cell, a photovoltaic cell and a photovoltaic cell assembly. Background Art

[0002] Patent application CN101425546B discloses an electrode for a photovoltaic cell, which includes an electrically insulating optically transparent film having a flat surface, an adhesive layer disposed on the flat surface, and a plurality of electrically conductive wires disposed in parallel, wherein the wires are located above the flat surface of the film and embedded in the adhesive layer, and the thickness of the adhesive layer is less than the thickness of the wires embedded in the adhesive layer, so that a portion of the surface of the wires protrudes from the adhesive layer. The electrode disclosed in the patent document has two layers of thin films, one of which is an electrically insulating optically transparent film and the other is an adhesive layer, which makes the electrode structure complex, thereby making the manufacturing process complex, and the relative displacement between the film and the wire and the photovoltaic element during the manufacturing process is large, thereby affecting the performance of the photovoltaic module. Summary of the invention

[0003] The object of the present invention is to provide an electrode for a photovoltaic cell in view of the problems in the prior art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An electrode for a photovoltaic cell comprises a composite film having conductive properties and adhesive properties after being heated and a plurality of parallel metal wires embedded in the composite film by bonding, wherein each metal wire partially protrudes from the composite film.

[0006] Preferably, the composite film is heated to 90-110° C. to soften and bond with the plurality of strands of the metal wires.

[0007] Preferably, the composite film is a colorless transparent film, and the average transmittance of incident photons in the UV-VIS-NIR range is greater than 90%, or the composite film is a colored film, and the average transmittance of incident photons in the UV-VIS-NIR range is greater than 30%.

[0008] Preferably, the material of the composite film includes PO, EVA, PVB, PE, PP or PMMA.

[0009] Preferably, the thickness of the composite film is 20-100 um.

[0010] Preferably, a transparent film is provided on an end surface of the composite film away from the photovoltaic cell, and the transparent film is an anti-reflection film or an enhancement-reflection film.

[0011] Furthermore, the transparent film is conductive, and the material of the transparent film includes indium tin oxide, tungsten-doped indium oxide, aluminum-doped zinc oxide, gallium-doped zinc oxide or indium tin zinc oxide, or the transparent film is an electrically insulating optically transparent film.

[0012] Preferably, the end surface of the composite film in contact with the photovoltaic cell is a rough surface or an embossed surface.

[0013] Preferably, multiple strands of the metal wire are arranged in parallel to form a plane, and the composite film includes an upper composite film and a lower composite film respectively located on opposite sides of the plane, with a spacing distance between the upper composite film and the lower composite film, and each strand of the metal wire partially protrudes from the upper composite film and the lower composite film.

[0014] The present invention also provides a photovoltaic cell having an electrode as described in any one of the above items, wherein the portion of the metal wire protruding from the composite film contacts the fine grid line of the photovoltaic cell, and the metal wire intersects the fine grid line perpendicularly.

[0015] The present invention also provides a photovoltaic cell assembly having any electrode as described above.

[0016] Preferably, multiple strands of the metal wires are arranged in parallel to form a plane, and the composite film includes an upper composite film and a lower composite film respectively located on opposite sides of the plane, and there is a spacing distance between the upper composite film and the lower composite film, and each strand of the metal wire partially protrudes from the upper composite film and the lower composite film. The upper composite film and the lower composite film of the same composite film are respectively bonded to different photovoltaic cells by hot pressing, and the parts of the metal wires protruding from the upper composite film and the lower composite film are respectively in contact with the fine grid lines of the photovoltaic cell, and the metal wires intersect the fine grid lines perpendicularly.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the electrode structure for photovoltaic cells of the present invention is simple, which makes the manufacturing process of the electrode also simple, and can reduce the relative displacement between the composite film and metal wire and the photovoltaic cell during the electrode manufacturing process, thereby improving the performance of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a schematic structural diagram of an electrode for a photovoltaic cell of the present invention;

[0019] Attached Figure 2 It is a schematic structural diagram of the photovoltaic cell assembly of the present invention. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the electrode for a photovoltaic cell of the present invention comprises a composite film 1 and a plurality of metal wires 2 arranged in parallel. The composite film 1 has an adhesive effect after being heated. After the composite film 1 is heated and softened, the plurality of metal wires 2 can be respectively bonded and embedded in the composite film 1, and each metal wire 2 has a portion protruding from the composite film 1.

[0022] The composite film 1 has conductive properties, which can reduce the overall series resistance of the photovoltaic cell module formed therewith.

[0023] The composite film 1 is made of PO, EVA, PVB, PE, PP or PMMA, and can also be used to prevent the acid or other oxidizing and corrosive chemicals released by the aging of the packaging materials of the photovoltaic system from reaching the surface of the photovoltaic cell 4, thereby affecting the performance of the photovoltaic cell 4. In this embodiment, the composite film 1 is heated to 90-110°C to soften it and have an adhesive effect, so that it is bonded to the multiple metal wires 2.

[0024] The composite film 1 may be a colorless and transparent film, and its average transmittance of incident photons in the UV-VIS-NIR range is preferably greater than 90%.

[0025] Alternatively, the composite film 1 may also have a specific color, such as black, orange, white, etc. to meet the degree of personalization in different applications, but its average transmittance of incident photons in the UV-VIS-NIR range should preferably be greater than 30%.

[0026] In this embodiment, the thickness of the composite film 1 is 20-100 um, and the width and length thereof are the same as the width and length of the photovoltaic cell 4 , or slightly smaller than the width and length of the photovoltaic cell 4 .

[0027] A transparent film 3 may also be provided on one end surface of the composite film 1 away from the photovoltaic cell 4 , and the transparent film 3 is an anti-reflection film or an enhancement-reflection film.

[0028] The transparent film 3 may be conductive, and in this case, the material of the transparent film 3 includes indium tin oxide, tungsten-doped indium oxide, aluminum-doped zinc oxide, gallium-doped zinc oxide or indium tin zinc oxide. The transparent film 3 may also be an electrically insulating optically transparent film.

[0029] One end surface of the composite film 1 in contact with the photovoltaic cell 4 is a rough surface or an embossed surface, which can reduce or avoid mutual displacement between the composite film 1 and the metal wire 2 and the photovoltaic cell 4 during the electrode production process.

[0030] A plurality of metal wires 2 are arranged in parallel to form a plane. The composite film 1 includes an upper composite film 11 and a lower composite film 12 located on opposite sides of the plane. There is a spacing distance between the upper composite film 11 and the lower composite film 12. Each metal wire 2 partially protrudes from the upper composite film 11 and the lower composite film 12.

[0031] The present invention also discloses a photovoltaic cell having an electrode as described above, wherein a composite film 1 is superimposed on a photovoltaic cell 4 and bonded to the photovoltaic cell 4 by hot pressing, a portion of a metal wire 2 protruding from the composite film 1 is in contact with a fine grid line of the photovoltaic cell 4, and the metal wire 2 intersects the fine grid line vertically.

[0032] The present invention also discloses a photovoltaic cell assembly, such as Figure 2 As shown, the battery assembly includes at least two photovoltaic cells 4 and multiple composite films 1, the composite film 1 includes an upper composite film 11 and a lower composite film 12, the upper composite film 11 and the lower composite film 12 of the same composite film 1 are respectively superimposed on different photovoltaic cells 4 and bonded thereto by hot pressing, the parts of the metal wire 2 protruding from the upper composite film 11 and the lower composite film 12 are respectively in contact with the fine grid lines of the photovoltaic cell 4, and the metal wire intersects the fine grid lines vertically.

[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic cell assembly, the photovoltaic cell assembly comprising a photovoltaic cell, the photovoltaic cell comprising an electrode for the photovoltaic cell, Features: The electrode comprises a composite film having conductive properties and an adhesive effect after being heated, and a plurality of parallel metal wires embedded in the composite film by bonding, wherein the plurality of metal wires are arranged in parallel to form a plane, the composite film comprises an upper composite film and a lower composite film respectively located on opposite sides of the plane, a spacing distance is provided between the upper composite film and the lower composite film, each strand of the metal wire partially protrudes from one end surface of the upper composite film and the lower composite film, the upper composite film and the lower composite film of the same composite film are respectively bonded to different photovoltaic cells by hot pressing, and the portions of the metal wires protruding from the upper composite film and the lower composite film are respectively in contact with the fine grid lines of the photovoltaic cell, and the metal wires intersect the fine grid lines perpendicularly; The composite film is heated to 90-110° C. to soften and bond with the plurality of metal wires; A transparent film is provided on one end surface of the composite film away from the photovoltaic cell. The transparent film is an anti-reflection film or an enhancement-reflection film. The transparent film is conductive and is made of indium tin oxide, tungsten-doped indium oxide, aluminum-doped zinc oxide, gallium-doped zinc oxide or indium tin zinc oxide.

2. The photovoltaic cell assembly according to claim 1, characterized in that: The composite film is a colorless and transparent film, and the average transmittance of incident photons in the UV-VIS-NIR range is greater than 90%, or the composite film is a colored film, and the average transmittance of incident photons in the UV-VIS-NIR range is greater than 30%.

3. The photovoltaic cell assembly according to claim 1, characterized in that: The material of the composite film includes PO, EVA, PVB, PE, PP or PMMA.

4. The photovoltaic cell assembly according to claim 1, characterized in that: The thickness of the composite film is 20-100 um.

5. The photovoltaic cell assembly according to claim 1, characterized in that: One end surface of the composite film in contact with the photovoltaic cell is a rough surface or an embossed surface.

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