Photovoltaic module
By setting a photocurable transparent layer on the carrier film of ZBB batteries and using ultraviolet light curing instead of heat curing, the problems of solder ribbon misalignment and carrier film deformation are solved, the stringing efficiency is improved and the defect rate is reduced, and the production process is simplified.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-03-27
AI Technical Summary
In the coating process of ZBB batteries, the solder ribbon is prone to misalignment, and the carrier film may be deformed or damaged, affecting the coating process quality and increasing the defect rate and production cost.
A photocurable transparent layer is set on the carrier film, and the photocuring process replaces the heating curing process to fix the solder ribbon and avoid deformation or damage to the carrier film. The combination of the UV-curable transparent layer and the modified EVA layer improves the fixing effect of the solder ribbon.
It improved the efficiency of string welding, reduced the defect rate and rework rate, simplified the production process, and reduced production costs.
Smart Images
Figure CN224054700U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the battery manufacturing technical field relates to a photovoltaic module. BACKGROUND
[0002] In the booming development of renewable energy technology today, silicon-based solar cells as an important member of the field of photoelectric conversion, with its high conversion efficiency, good stability, relatively mature preparation process and other advantages, has become one of the most widely used solar power generation methods in the world. Silicon-based solar cells mainly convert sunlight into electrical energy through photoelectric effect, and its performance is closely related to structure design, material selection and manufacturing process.
[0003] At present, according to the structural characteristics, silicon-based solar cells include PERC cells, TOPCon cells, HBC cells and HJT cells. Among them, TOPCon cell is a kind of high-efficiency cell structure developed rapidly in recent years, its characteristics are that the emitter and back surface of the cell adopt the passivation contact structure composed of tunneling oxide layer and polysilicon layer, which significantly reduces the contact resistance, while maintaining good surface passivation effect. This structure not only improves the open-circuit voltage, but also optimizes the transmission path of the carrier, reduces the recombination loss, so that the conversion efficiency is significantly improved.
[0004] The above-mentioned structure solar cell is increasingly urgent in further improving efficiency and reducing cost, the industry begins to explore new cell design ideas, among them, the zero busbar battery (ZBB) is concerned because of its unique structure and potential performance advantages.
[0005] ZBB-TOPCon cell as a kind of zero busbar battery, compared with the conventional TOPCon cell, further simplifies the cell structure, removes all the main grid lines, and is directly connected to the conductive area of the cell through the back fine metalization lines and solder strip. This design greatly reduces the loss caused by grid line shading, improves the light trapping capacity and light utilization rate of the cell, also effectively optimizes the current collection path, reduces the resistance loss, finally improves the fill factor and conversion efficiency. In addition, the appearance of ZBB cell is more simple, which is suitable for the field of building integrated photovoltaic (BIPV) and other fields with high requirements for aesthetics.
[0006] In the manufacturing process of ZBB battery, the film coating process is one of the key links, which involves the use of carrier film, laying the solder strip on the carrier film and adhering the battery, and then heating and curing. The carrier film serves as a support platform for the solder strip, and after fixing the carrier film and the battery, it can protect and support the fine and dense metallized pattern accurately adhered to the battery sheet without welding. It can be seen that the film coating process directly affects the yield and final performance of the ZBB battery. However, in actual production, during the heating and curing process, the solder strip is very easy to deviate from its position on the carrier film, and the carrier film may be damaged, lifted and wrinkled due to stress concentration or defects in the material itself, which seriously interferes with the accurate placement of the solder strip, greatly affects the quality of the film coating process, and greatly increases the battery defect rate, repair rate and production cost.
[0007] In view of the above challenges encountered by ZBB battery in the film coating process, it is particularly important to conduct in-depth research and development. Practical new type content
[0008] In view of the problems in the prior art, the utility model provides a photovoltaic module, the photovoltaic module includes no main grid battery piece, solder strip and carrier film, the carrier film includes the base layer and the photocuring transparent layer of laminated arrangement, the carrier film is used to pre-fix the solder strip on the surface of no main grid battery piece, the photocuring transparent layer is arranged in the side of the base layer towards no main grid battery piece. The utility model sets up photocuring transparent layer on the carrier film when no main grid battery string is welded, and the photocuring process of photocuring transparent layer is used to replace the heating and curing process of carrier film, which can realize the effect of fixing solder strip on battery and avoid solder strip deviation, solve the film coating problem caused by deformation or damage of carrier film due to heating and curing, further improve the string welding efficiency, and also help to reduce the defect rate and repair rate.
[0009] To achieve this purpose, the utility model adopts the following technical scheme:
[0010] In the first aspect, the utility model provides a photovoltaic module, the photovoltaic module includes no main grid battery piece, solder strip and carrier film, the carrier film includes the base layer and the photocuring transparent layer of laminated arrangement, the carrier film is used to pre-fix the solder strip on the surface of no main grid battery piece, the photocuring transparent layer is arranged in the side of the base layer towards no main grid battery piece.
[0011] The utility model discloses a photovoltaic module, which comprises a carrier film, a solder strip and a photocuring transparent layer.
[0012] The following is the preferred technical scheme of the utility model, but not as the restriction of the technical scheme provided by the utility model, through the following technical scheme, the technical purpose and beneficial effect of the utility model can be better achieved and realized.
[0013] As the preferred technical scheme of the utility model, the photovoltaic module further comprises a carrier film, the photocuring transparent layer is arranged on the surface of the carrier film, and the photocuring transparent layer is arranged between the carrier film and the solder strip.
[0014] It should be noted that in the ZBB battery without main grid, a pressing process is still needed after the string welding, therefore, the carrier film can be selected and arranged as needed, at this time, the carrier film does not play the role of fixing the solder strip and the battery in the string welding process, but the photocuring transparent layer plays this effect, and the carrier film is arranged only to meet the subsequent processing and manufacturing needs.
[0015] As the preferred technical scheme of the utility model, the thickness of the photocuring transparent layer is 0.2mm-0.3mm, for example, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm or 0.3mm, but is not limited to the listed values, and other values not listed in the above value range are also applicable.
[0016] As the preferred technical scheme of the utility model, the length and width of the photocuring transparent layer are the same as those of the carrier film.
[0017] As the preferred technical scheme of the utility model, the carrier film is in strip shape, and the width of the carrier film is 2.5mm-3.5mm, for example, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm or 3.5mm, but is not limited to the listed values, and other values not listed in the above value range are also applicable.
[0018] As the preferred technical scheme of the utility model, the photocuring transparent layer comprises an ultraviolet photocuring transparent layer.
[0019] As the preferred technical scheme of the utility model, the ultraviolet light curing layer comprises an ultraviolet light curing resin layer, and the ultraviolet light curing resin layer comprises a modified EVA layer.
[0020] Illustratively, the ultraviolet light curing resin layer comprises resin and a photoinitiator, the photoinitiator is an ultraviolet light initiator, so that the raw material emulsion of the light curing transparent layer is cured within a time of one-tenth of a second under ultraviolet light irradiation; when the resin is a modified EVA, the ultraviolet light curing resin layer is the modified EVA layer.
[0021] Illustratively, the ultraviolet light initiator comprises at least one of benzoin dimethyl ether, benzophenone, diphenyl ketone or 2-hydroxy-2-methyl-1-phenylpropanone.
[0022] Preferably, the amount of the ultraviolet light initiator is 1% to 5% of the mass of the resin, for example, 1%, 1.3%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.3%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8% or 5%, etc., but not only limited to the listed values, and other values within the above range are also applicable.
[0023] Illustratively, the modified EVA comprises EVA and additional monomers copolymerized with the EVA.
[0024] Preferably, the additional monomers comprise phenylacetic acid and / or acrylic acid.
[0025] Preferably, in the EVA, the mass percentage of VA (vinyl acetate) is 80% to 90%, for example, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89% or 90%, etc., but not only limited to the listed values, and other values within the above range are also applicable.
[0026] Preferably, the modified EVA is an EVA-phenylacetic acid-acrylic acid copolymer.
[0027] The utility model further preferably uses ethylene-vinyl acetate-phenylacetic acid-acrylic acid copolymer, by introducing phenylacetic acid and acrylic acid as the third monomer to form a copolymer with EVA, which can effectively improve the anti-aging property and acid and alkali resistance of the obtained light curing transparent layer.
[0028] Preferably, the light curing transparent layer further comprises an additive, and the additive comprises a tackifier and / or an antioxidant.
[0029] Preferably, the tackifier includes at least one of rosin resin, petroleum resin, polyethylene wax, paraffin wax or polyacrylate; the tackifier is used in an amount of 0.5% to 1% of the mass of the resin, for example 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85% or 0.9%, etc., but not limited to the listed values, and other values within the above range are also applicable.
[0030] The use of the tackifier can effectively promote the bonding strength of the photocured transparent layer, further ensure the pre-fixing of the solder strip, prevent displacement thereof, and also facilitate auxiliary prevention of deformation and damage of the carrier film.
[0031] Preferably, the antioxidant includes butyl hydroxy benzoic acid phenol and / or butyl hydroxy benzoic acid ester; the antioxidant is used in an amount of 0.5% to 1% of the mass of the resin, for example 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85% or 0.9%, etc., but not limited to the listed values, and other values within the above range are also applicable.
[0032] The use of the antioxidant can further effectively improve the anti-aging performance of the obtained photocured transparent layer.
[0033] Exemplarily, the utility model provides a kind of film manufacturing method of the photovoltaic module, and the film manufacturing method includes:
[0034] The raw material emulsion of the photocured transparent layer is coated on the surface of the carrier film to form an uncured layer, the solder strip is laid on the uncured layer first, and then the battery piece is covered to obtain an assembly, the assembly is irradiated by ultraviolet light to complete ultraviolet photocuring of the photocured transparent layer, the solder strip is fixed with the battery piece, and the film is completed.
[0035] It should be noted that in the field of ZBB battery manufacturing, the carrier film and solder strip used in the film coating process of the string welding machine can be applied to the utility model, for example, the solder strip includes a low-temperature solder strip. It can be understood that in the actual string welding process, the string welding equipment and / or production line should remove the process of heating and curing the carrier film, and increase the coating process and light irradiation process.
[0036] As a preferred technical solution of the utility model, the photovoltaic module further includes an upper adhesive film and a lower adhesive film.
[0037] As a preferred technical solution of the utility model, the photovoltaic module further includes an upper cover plate and a lower cover plate.
[0038] It can be understood that the adhesive film and the cover plate are used in the pressing process after the string welding process, and therefore the carrier film and the welding strip used in the field can be applied to the utility model.
[0039] Compared with the prior art, the utility model has at least the following beneficial effects:
[0040] The utility model discloses a carrier film is provided with the photocuring transparent layer on the string welding of no main grid battery, and the photocuring process of photocuring transparent layer is used to replace the heating solidification process of carrier film, which can realize the effect that the welding strip is fixed on the battery and avoids the offset of the welding strip, and can solve the film coating problem caused by the deformation or damage of the carrier film due to heating solidification, further improve the string welding efficiency of photovoltaic module, and is also favorable for reducing the failure rate and the repair rate. BRIEF DESCRIPTION OF DRAWINGS
[0041] Figure 1 It is the structure schematic view of photovoltaic module in example 1.
[0042] Figure 2 It is the process flow schematic view of film coating manufacturing of photovoltaic module in example 1.
[0043] In the drawing: 1-carrier film, 2-photocuring transparent layer, 3-welding strip, 4-battery piece, 5-unsolidified layer. DETAILED DESCRIPTION
[0044] The technical scheme of the utility model will be further illustrated by specific embodiments.
[0045] Those skilled in the art should understand that the embodiments are only to help understanding the utility model, and should not be regarded as the specific limitation of the utility model.
[0046] Example 1
[0047] The embodiment provides a kind of photovoltaic module, as shown in Figure 1 The photovoltaic module includes photocuring transparent layer 2, welding strip 3 and battery 4 in turn, and the photocuring transparent layer 2 not covered by the welding strip 3 is in contact with the surface of the battery 4, and is connected and fixed on the surface of the battery 4 by photocuring, so that the welding strip 3 is fixed on the battery 4;The thickness of the photocuring transparent layer 2 is 0.25mm, and the length and width are same with the carrier film 1, the carrier film 1 is strip-shaped, and the width of the carrier film 1 is 3.0mm;The photocuring transparent layer 2 is ultraviolet photocuring transparent layer, and the ultraviolet photocuring resin layer is modified EVA layer.
[0048] The film coating manufacturing method of the photovoltaic module, as shown in Figure 2 It includes:
[0049] S1. Coating the surface of the carrier film 1 with a raw material emulsion of a photocured transparent layer to form an uncured layer 5;
[0050] The raw material emulsion of the photocured transparent layer 2 comprises a resin and a photoinitiator, the resin comprises a main component and an additional monomer copolymerized with the main component; the main component is EVA; the mass percentage of VA in EVA is 86%; the additional monomer is phenylacetic acid and acrylic acid, that is, the resin is an EVA-phenylacetic acid-acrylic acid copolymer, the raw material emulsion is an ethylene-vinyl acetate-phenylacetic acid-acrylic acid copolymer emulsion; and the photoinitiator is ultraviolet photoinitiator benzoin dimethyl ether, the amount of the photoinitiator is 2.3% of the mass of the resin; the raw material emulsion of the photocured transparent layer also contains a tackifier, the tackifier is rosin resin, the amount of the tackifier is 0.7% of the mass of the resin; the raw material emulsion of the photocured transparent layer also contains an antioxidant, the antioxidant is butylated hydroxytoluene, the amount of the antioxidant is 0.5% of the mass of the resin;
[0051] S2. Laying a low-temperature solder strip 3 on the uncured layer 5 first, and then covering a battery piece 4 to obtain an assembly; the assembly is subjected to photocuring under ultraviolet light irradiation to form a photocured transparent layer 2 with a thickness of 0.25 mm; the photocured transparent layer 2 fixes the solder strip 3 and the battery piece 4, the film manufacturing is completed, and the photovoltaic assembly is obtained.
[0052] Example 2
[0053] The photovoltaic assembly of the present embodiment adjusts the thickness of the photocured transparent layer 2 from 0.25 mm to 0.15 mm, and other conditions are the same as those of Example 1.
[0054] Example 3
[0055] The photovoltaic assembly of the present embodiment adjusts the thickness of the photocured transparent layer 2 from 0.25 mm to 0.2 mm, and other conditions are the same as those of Example 1.
[0056] Example 4
[0057] The photovoltaic assembly of the present embodiment adjusts the thickness of the photocured transparent layer 2 from 0.25 mm to 0.3 mm, and other conditions are the same as those of Example 1.
[0058] Example 5
[0059] The photovoltaic assembly of the present embodiment adjusts the thickness of the photocured transparent layer 2 from 0.25 mm to 0.35 mm, and other conditions are the same as those of Example 1.
[0060] Comparative Example 1
[0061] The present comparative example provides a photovoltaic module which does not contain the light-cured transparent layer 2, but only contains the carrier film 1, the solder strip 2 and the cell 4 which are sequentially stacked; in the film coating manufacturing method of the photovoltaic module, the low-temperature solder strip 3 is laid directly on the carrier film 1, and then the cell piece 4 is covered to obtain an assembly; then the assembly is heated and cured to fix the carrier film 1 and the cell piece 4, and the film coating is completed.
[0062] Application Example 1
[0063] The present application example provides a ZBB-TOPCon cell which adopts the photovoltaic module provided in Embodiment 1, and the cell 4 is a TOPCon cell, and the ZBB-TOPCon cell is further provided with an upper adhesive film, a lower adhesive film, an upper cover plate and a lower cover plate; wherein the upper adhesive film is arranged on the surface of the cell 4 away from the solder strip 3, and the lower adhesive film is arranged on the surface of the carrier film 1 away from the light-cured transparent layer 2; the upper cover plate is arranged on the surface of the upper adhesive film away from the cell 4, and the lower cover plate is arranged on the surface of the lower adhesive film away from the carrier film 1.
[0064] The manufacturing method of the ZBB-TOPCon cell is based on the film coating manufacturing method of the photovoltaic module provided in Embodiment 1, and a step S3 is added: providing an upper adhesive film, a lower adhesive film, an upper cover plate and a lower cover plate, assembling on the photovoltaic module, and then pressing to obtain a ZBB-TOPCon cell, and other conditions are the same as those in Embodiment 1.
[0065] Compared with Comparative Example 1, in the photovoltaic module and its film coating manufacturing process provided in Embodiments 1-5, a specific light-cured transparent layer is covered on the carrier film, so that the film coating process can be completed by fixing the solder strip on the cell piece by ultraviolet curing, without the need for a heating and curing process. In this way, the solder strip is fixed to avoid deviation, and the film coating problem caused by deformation or damage of the carrier film during the heating and curing process is reduced, the string welding efficiency is further improved, the defective rate and the rework rate are reduced, and effective protection is provided for subsequent pressing and other processes in Application Example 1.
[0066] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.
[0067] In addition, it should be noted that the various specific technical features described in the foregoing detailed description can be combined in any suitable manner, and that the application contemplates all possible combinations of features, unless otherwise indicated herein.
[0068] Furthermore, the various embodiments of the application can also be combined with each other, as long as they do not contradict the spirit of the application, and they should also be considered as disclosed by the application.
Claims
1. A photovoltaic module, characterized by, The photovoltaic module comprises a busbar-free cell, a solder strip and a carrier film, the carrier film comprises a base layer and a photocured transparent layer which are stacked, the carrier film is used to pre-fix the solder strip on the surface of the busbar-free cell, and the photocured transparent layer is arranged on the side of the base layer facing the busbar-free cell.
2. The photovoltaic module of claim 1, wherein, The photocured transparent layer is arranged on the surface of the carrier film, and the photocured transparent layer is arranged between the carrier film and the solder strip.
3. The photovoltaic module of claim 2, wherein, The thickness of the photocured transparent layer is 0.2mm-0.3mm.
4. The photovoltaic module according to claim 2 or 3, characterized in that The length and width of the photocured transparent layer are the same as those of the carrier film.
5. The photovoltaic module of claim 4, wherein, The carrier film is in a strip shape, and the width of the carrier film is 2.5mm-3.5mm.
6. The photovoltaic module of claim 1, wherein, The photocured transparent layer comprises an ultraviolet photocured transparent layer.
7. The photovoltaic module of claim 6, wherein, The ultraviolet photocured transparent layer comprises an ultraviolet photocured resin layer.
8. The photovoltaic module of claim 2, wherein, The photovoltaic module further comprises an upper adhesive film and a lower adhesive film.
9. The photovoltaic module of claim 8, wherein, The photovoltaic module further comprises an upper cover plate and a lower cover plate.