A photovoltaic module with hidden busbars, a method of manufacturing the same, and a photovoltaic device

Abstract

The application provides a photovoltaic module hiding bus bars, a preparation method thereof and a photovoltaic device, and relates to the field of photovoltaic modules. Insulating ink is arranged on the position of the bus bar welding of the fine grid line and the back of the cell sheet, and first solidification is performed to obtain a first solidified cell sheet; the main grid Pad point of the back of the first solidified cell sheet is provided with tin paste, and second solidification is performed to obtain a second solidified cell sheet; the second solidified cell sheet is subjected to cell sheet cutting and ribbon welding to obtain a welded cell sheet; the welded cell sheet, the first adhesive film and the first glass are sequentially stacked, the bus bar is arranged on the insulating ink of the welded cell sheet, and overlay welding is performed to obtain an overlaid cell string; the overlaid cell string, the second adhesive film and the second glass are sequentially stacked, and encapsulation lamination is performed to obtain the photovoltaic module. The insulating ink is printed on the back of the cell sheet, the bus bar is isolated from the heterogeneous solder strip, the risk of short circuit of the cell sheet is reduced, the buffer effect is achieved during the cell string overlay welding, and the risk of cell sheet cracking is reduced.

Description

Technical Field

[0001] This application relates to the field of photovoltaic modules, and more particularly to a photovoltaic module with a hidden busbar, a method for its preparation, and a photovoltaic device. Background Technology

[0002] In traditional photovoltaic modules, the busbars are directly exposed under the front glass, with the solder ribbons and welded surfaces of the busbars clearly visible. During lamination, the busbars may shift or roll back, posing a risk of microcracks and affecting the module's surface flatness, even leading to panel bursting. Traditional all-black BC modules use black shading strips (insulation) to shield the busbars. Since these strips are glued to the busbars, the adhesion is weak, making them prone to shifting during lamination. The exposed silver busbars create a noticeable color difference with the dark blue solar cells, reducing the overall harmony of the module. Furthermore, in traditional BC modules, the busbars and cell strings do not overlap. The busbars themselves and the spacing between them and the cells occupy 2%-5% of the module's surface area, reducing the effective solar energy reception area and impacting power generation efficiency.

[0003] Traditional busbar layouts are typically exposed on the module surface, affecting the module's aesthetics and power generation efficiency. The advantage of concealed busbars lies in increasing the module's light-receiving area and power generation efficiency by reducing sunlight obstruction. Concealed busbar technology makes the photovoltaic module surface smoother and more aesthetically pleasing, enhancing the overall visual appeal of building-integrated projects. However, concealed busbars still present the following challenges: By using black light-blocking strips to shield the front of the busbar, it is easy for the bonding to become weak and fall off during the component manufacturing process, and for the component to shift during lamination, affecting the appearance of the component. In back-contact assemblies, the busbars are directly soldered to the back solder strips. Insulating strips are used to isolate the busbars from the irregularly shaped solder strips to prevent short circuits. The insulating strips require high placement precision and are prone to misalignment, which can lead to short circuits in the cells. Furthermore, during aging tests, the insulating strips are more likely to delaminate, causing short circuits in the cells as well.

[0004] Therefore, there is an urgent need to provide a method for manufacturing photovoltaic modules with hidden busbars to solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a photovoltaic module with a hidden busbar, a method for its preparation, and a photovoltaic device to solve the above-mentioned problems.

[0006] To achieve the above objectives, the first aspect of this application provides a method for manufacturing a photovoltaic module with concealed busbars, comprising: Insulating ink is applied to the welding positions of the fine grid lines and busbars on the back of the battery cell, and the first curing is performed to obtain the first cured battery cell; Solder paste is applied to the main grid Pad points on the back of the first cured battery cell, and a second curing is performed to obtain the second cured battery cell. The second cured battery cell is diced and welded with solder strips to obtain a welded battery cell. The welded battery cells, the first encapsulant film, and the first glass are stacked in sequence, and the busbars are placed on the insulating ink of the welded battery cells. The stacked batteries are then welded together to obtain a stacked battery string. The stacked battery string, the second encapsulant film, and the second glass are then stacked in sequence and encapsulated and laminated to obtain a photovoltaic module.

[0007] Optionally, the raw materials of the insulating ink, based on a total mass of 100%, include: The composition includes 30%-50% phenolic epoxy acrylic oligomer, 2%-8% photoinitiator, 10%-15% polyfunctional monomer, 5%-10% monofunctional monomer, 20%-37% filler, 0.5%-2% thickener, 0.1%-2% pigment, and 0.5%-2% adhesion promoter.

[0008] Optionally, the method for manufacturing the photovoltaic module with hidden busbars satisfies at least one of the following conditions: A. The photoinitiator comprises 2-ethylanthraquinone and / or 1-hydroxycyclohexylphenyl ketone; B. The multifunctional monomer includes trimethylolpropane triacrylate.

[0009] Optionally, the method for manufacturing the photovoltaic module with hidden busbars satisfies at least one of the following conditions: A. The monofunctional monomer includes hydroxyethyl methacrylate; B. The filler includes talc and / or silica.

[0010] Optionally, the thickener may include bentonite.

[0011] Optionally, the pigment includes phthalocyanine green G.

[0012] Optionally, the adhesion promoter includes dimethylpolysiloxane.

[0013] Optionally, the raw materials of the insulating ink, based on a total mass of 100%, include: The composition includes 30%-50% phenolic epoxy acrylate oligomer, 1%-3% 2-ethylanthraquinone, 1%-5% 1-hydroxycyclohexylphenyl ketone, 10%-15% trimethylolpropane triacrylate, 5%-10% hydroxyethyl methacrylate, 20%-35% talc, 0.1%-2% silica, 0.5%-2% bentonite, 0.1%-2% phthalocyanine green G, and 0.5%-2% dimethicone.

[0014] The second aspect of this application provides a photovoltaic module with hidden busbars, which is prepared by the method for preparing a photovoltaic module with hidden busbars.

[0015] A third aspect of this application provides a photovoltaic device, including the aforementioned photovoltaic module with a hidden busbar.

[0016] Compared with the prior art, the beneficial effects of this application include: The method for manufacturing photovoltaic modules with hidden busbars provided in this application involves printing insulating ink on the back of the solar cells to isolate the busbars from the irregular solder ribbons, thereby reducing the risk of short circuits in the solar cells and acting as a buffer during the stacking of solar cell strings to reduce the risk of cell cracking.

[0017] The photovoltaic module with hidden busbars provided in this application allows the space between the original busbars and the gap between them and the cells to be utilized by increasing the size of the cells. This increases the effective light-receiving area on the front of the cells, solves the current adaptation problem caused by the hidden busbars, increases the light-receiving area on the front, improves the module efficiency, and achieves a full-screen effect, thus enhancing visual consistency.

[0018] The photovoltaic equipment provided in this application has high efficiency and good visual consistency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0020] Figure 1 A schematic diagram of the insulating ink screen provided in Example 1; Figure 2 This is a schematic diagram of the insulating ink printing effect provided in Example 1; Figure 3 This is a schematic diagram of the welding strip cutting and bending device provided in Example 1; Figure 4 A schematic diagram of busbar welding provided in Example 1; Figure 5 This is a schematic diagram of the busbar, insulating ink, and solder strip provided in Example 1; Figure 6 This is a schematic diagram of the structure of the photovoltaic module with hidden busbars provided in Example 1.

[0021] Explanation of key component symbols: 100-Battery string; 110-Insulating ink; 120-Busbar; 130-Welding strip; 200-Front end film; 300-Front tempered glass; 400-Back end film; 500-Back tempered glass; 600-Frame; 710-Welding strip traction belt; 720-Bending roller; 730-Cutter; 810-Flattening roller; 820-Busbar adsorption and handling device; 821-Electromagnetic welding head. Detailed Implementation

[0022] As used in this article: "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0023] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0024] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0025] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0026] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0027] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0028] The first aspect of this application provides a method for manufacturing a photovoltaic module with hidden busbars, comprising: Insulating ink is applied to the welding positions of the fine grid lines and busbars on the back of the battery cell, and the first curing is performed to obtain the first cured battery cell; Solder paste is applied to the main grid Pad points on the back of the first cured battery cell, and a second curing is performed to obtain the second cured battery cell. The second cured battery cell is diced and welded with solder strips to obtain a welded battery cell. The welded battery cells, the first encapsulant film, and the first glass are stacked in sequence, and the busbars are placed on the insulating ink of the welded battery cells. The stacked batteries are then welded together to obtain a stacked battery string. The stacked battery string, the second encapsulant film, and the second glass are then stacked in sequence and encapsulated and laminated to obtain a photovoltaic module.

[0029] In some embodiments, the raw materials of the insulating ink, based on a total mass of 100%, include: The composition includes 30%-50% phenolic epoxy acrylic oligomer, 2%-8% photoinitiator, 10%-15% polyfunctional monomer, 5%-10% monofunctional monomer, 20%-37% filler, 0.5%-2% thickener, 0.1%-2% pigment, and 0.5%-2% adhesion promoter.

[0030] Optionally, the raw materials of the insulating ink, based on a total mass of 100%, may include phenolic epoxy acrylic oligomers of any value between 30%, 35%, 40%, 45%, 50%, or 30%-50%; photoinitiators of any value between 2%, 4%, 6%, 8%, or 2%-8%; multifunctional monomers of any value between 10%, 11%, 12%, 13%, 14%, 15%, or 10%-15%; and monofunctional monomers of any value between 5%, 6%, 7%, 8%, 9%, 1%. The following percentages are allowed: 0% or any value between 5% and 10%; filler can be any value between 20%, 25%, 30%, 35%, 37% or 20% and 37%; thickener can be any value between 0.5%, 1%, 1.5%, 2% or 0.5% and 2%; pigment can be any value between 0.1%, 0.5%, 1%, 1.5%, 2% or 0.1% and 2%; adhesion promoter can be any value between 0.5%, 1%, 1.5%, 2% or 0.5% and 2%.

[0031] It is important to note that phenolic epoxy acrylate oligomers are a special type of resin that combines the excellent heat and chemical resistance of phenolic epoxy resin with the UV-curable properties of acrylate through a chemical process. It is a polymer precursor with a relatively low molecular weight and containing multiple acrylate groups. Its core value lies in its ability to cure into a film extremely quickly under ultraviolet light, while the resulting coating exhibits similar excellent high-temperature resistance, chemical corrosion resistance, high hardness, high strength, and excellent electrical insulation properties as phenolic epoxy resin.

[0032] In some embodiments, the method for preparing a photovoltaic module with hidden busbars satisfies at least one of the following conditions: A. The photoinitiator comprises 2-ethylanthraquinone and / or 1-hydroxycyclohexylphenyl ketone; It should be noted that 2-ethylanthraquinone is a photoinitiator with properties such as acid resistance and insensitivity to oxygen; 1-hydroxycyclohexylphenyl ketone is a highly efficient photoinitiator. B. The multifunctional monomer includes trimethylolpropane triacrylate.

[0033] It should be noted that trimethylolpropane triacrylate has a certain plasticizing effect.

[0034] In some embodiments, the method for preparing a photovoltaic module with hidden busbars satisfies at least one of the following conditions: A. The monofunctional monomer includes hydroxyethyl methacrylate; B. The filler includes talc and / or silica.

[0035] It should be noted that talc can improve strength; silica can adjust viscosity and thixotropic properties.

[0036] In some embodiments, the thickener comprises bentonite.

[0037] It should be noted that bentonite has the function of regulating viscosity and thixotropy.

[0038] In some embodiments, the pigment includes phthalocyanine green G.

[0039] In some embodiments, the adhesion promoter comprises dimethylpolysiloxane.

[0040] In some embodiments, the raw materials of the insulating ink, based on a total mass of 100%, include: The composition includes 30%-50% phenolic epoxy acrylate oligomer, 1%-3% 2-ethylanthraquinone, 1%-5% 1-hydroxycyclohexylphenyl ketone, 10%-15% trimethylolpropane triacrylate, 5%-10% hydroxyethyl methacrylate, 20%-35% talc, 0.1%-2% silica, 0.5%-2% bentonite, 0.1%-2% phthalocyanine green G, and 0.5%-2% dimethicone.

[0041] Optionally, the raw materials of the insulating ink, based on a total mass of 100%, may include: phenolic epoxy acrylic oligomers, which may be any value between 30%, 35%, 40%, 45%, 50%, or 30%-50%; 2-ethylanthraquinone, which may be any value between 1%, 2%, 3%, or 1%-3%; 1-hydroxycyclohexylphenyl ketone, which may be any value between 1%, 2%, 3%, 4%, 5%, or 1%-5%; trimethylolpropane triacrylate, which may be any value between 10%, 11%, 12%, 13%, 14%, 15%, or 10%-15%; and hydroxyethyl methacrylate, which may be 5%, 6%, 7%, 8%, 9%. The following percentages are allowed: %, 10%, or any value between 5% and 10%; talc can be any value between 20%, 25%, 30%, 35%, or 20% and 35%; silica can be any value between 0.1%, 0.5%, 1%, 1.5%, 2%, or 0.1% and 2%; bentonite can be any value between 0.5%, 1%, 1.5%, 2%, or 0.5% and 2%; phthalocyanine green G can be any value between 0.1%, 0.5%, 1%, 1.5%, 2%, or 0.1% and 2%; and dimethyl polysiloxane can be any value between 0.5%, 1%, 1.5%, 2%, or 0.5% and 2%.

[0042] It is important to note that phenolic epoxy acrylate oligomers are the prepolymers of insulating inks and are a major component of the ink; 2-ethylanthraquinone is a photoinitiator that, after absorbing ultraviolet light, can transition to an excited state and generate free radicals through hydrogen abstraction or cleavage, initiating monomer polymerization; 1-hydroxycyclohexylphenyl ketone is a highly efficient photoinitiator that can rapidly initiate polymerization reactions within the adhesive, exhibiting high initiation efficiency, resistance to yellowing, and low volatility; trimethylolpropane triacrylate is a trifunctional acrylate monomer and a key component for achieving rapid molding and high abrasion resistance; hydroxyethyl methacrylate is a bifunctional monomer containing both acrylate double bonds (C=C) and hydroxyl groups (-OH), which can improve material toughness and adhesion; talc is a functional filler that enhances material strength; silica is a functional filler that can adjust viscosity and thixotropy; bentonite is a thickener that can also adjust viscosity and thixotropy; phthalocyanine green G is a pigment; and dimethyl polysiloxane is an adhesion promoter.

[0043] It should also be noted that in BC modules, since all electrodes are located on the back side, this application uses insulating ink to directly print on the hidden part of the busbar instead of the insulating strip, which greatly reduces the risk of short circuit in the cells. The insulating ink has strong adhesion to the cells and is not prone to delamination, thus improving the aging performance of the module. At the same time, the insulating ink can also act as a buffer, reducing the risk of microcracks in the cells during lamination. By hiding the busbar, the cell size can be increased while keeping the cell string position unchanged, increasing the light-receiving area on the front of the module, improving module efficiency, achieving a full-screen effect, and improving visual consistency.

[0044] In some embodiments, the location of the insulating ink printing and the location of the busbar welding are not limited to the edge of the battery cell.

[0045] In some embodiments, the printed pattern of the insulating ink is not limited to the entire strip and can be optimized according to the electrode position.

[0046] In some embodiments, the busbar weld head is not limited to the entire bevel.

[0047] The second aspect of this application provides a photovoltaic module with hidden busbars, which is prepared by the method for preparing a photovoltaic module with hidden busbars.

[0048] A third aspect of this application provides a photovoltaic device, including the aforementioned photovoltaic module with a hidden busbar.

[0049] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0050] Example 1 This embodiment provides a photovoltaic module with hidden busbars and its manufacturing method. The specific manufacturing steps are as follows: S1: Printing insulating ink on the back of the battery cell 110: Using a printing screen, the insulating ink is printed onto the fine grid lines and busbar welding positions on the back of the battery cell 120. The insulating ink screen is as follows: Figure 1 As shown, the printing effect of insulating ink is as follows: Figure 2 As shown, the insulating ink 110 is then cured in a UV curing zone / thermosetting chain oven and then transferred to the solder paste printing zone. S2: Solder paste printing on the back of the cell: Using a printing stencil, solder paste is printed onto the main grid pads on the back of the cell, then cured in a thermosetting chain furnace, and then transferred to the non-destructive dicing area. S3: Non-destructive dicing area: The cells are diced using a non-destructive dicing machine and arranged in a string. S4: Welding strip cutting, bending, and welding: After the welding strip 130 is stretched to the set length, it is cut and bent. The device for cutting and bending the welding strip is as follows: Figure 3 As shown, the welding strip 130 to be processed is fixed by the welding strip traction belt, the bending roller 720 moves upward to bend it, the cutter 730 cuts it, and the handling robot places the processed welding strip onto the battery cell for welding to obtain the battery string 100. S5: Battery string arrangement: According to the set position, the robotic arm places the battery string 100 on the front adhesive film 200 and the front tempered glass 300; S6: Busbar Welding: After the busbar is cut to the set length, it is transported to the set position (on the insulating ink) using a contact welding robot to complete the overlapping welding. Busbar welding is as follows: Figure 4 As shown, after the busbar 120 is cut, it is adsorbed onto the adsorption and conveying device 820. The busbar and the battery cell are welded by the electromagnetic welding head 821. After welding, the welding strip is flattened by the flattening roller 810. The structure of the welded busbar 120, insulating ink 110 and welding strip 130 is as follows. Figure 5 As shown; S7: Encapsulation and lamination: Cover the back with adhesive film 400, back with tempered glass 500, fix with edge sealing tape and then laminate. After setting the frame 600, a photovoltaic module with hidden busbars is obtained.

[0051] The structure of the photovoltaic module with the hidden busbar is as follows: Figure 6 As shown.

[0052] The raw materials for insulating ink, calculated by total mass of 100%, include: The composition of the product is as follows: 40% phenolic epoxy acrylate oligomer (purchased from Momentive Advanced Materials), 3% 2-ethylanthraquinone, 5% 1-hydroxycyclohexylphenyl ketone, 12% trimethylolpropane triacrylate, 10% hydroxyethyl methacrylate, 23% talc, 2% silica, 2% bentonite, 1% phthalocyanine green G, and 2% dimethicone.

[0053] Example 2 The difference from Example 1 is that the insulating ink formula is different, specifically: The insulating ink raw materials in this embodiment, based on a total mass of 100%, include: The composition of the product is as follows: 40% phenolic epoxy acrylate oligomer (purchased from Momentive Advanced Materials), 3% 2-ethylanthraquinone, 5% 1-hydroxycyclohexylphenyl ketone, 15% trimethylolpropane triacrylate, 10% hydroxyethyl methacrylate, 20% talc, 2% silica, 2% bentonite, 1% phthalocyanine green G, and 2% dimethicone.

[0054] Comparative Example 1 The difference from Example 1 is that this comparative example uses a conventional insulating strip, and the specific preparation steps are as follows: The battery cells are printed with insulating ink, which is then UV-cured / thermally cured. Solder paste is then printed on the cells, and after curing, the cells are arranged. After placement, solder ribbons are laid, and an insulating strip is pasted at the hidden position of the busbar (the insulating strip only has holes at the same polarity solder ribbon position). After being strung together, the cells are arranged and then stacked and soldered. After stacking and soldering, the cells are joined together, and after sealing the edges with perforated tape, they are laminated.

[0055] Comparative Example 2 The difference from Example 1 is that the insulating ink in Example 1 is replaced, specifically: 2-Ethylanthraquinone is not specified.

[0056] Comparative Example 3 The difference from Example 1 is that the insulating ink in Example 1 is replaced, specifically: 1-Hydroxycyclohexylphenyl ketone is not specified. The photovoltaic modules prepared in the above embodiments and comparative examples were subjected to HF (wet freeze test), DH (wet heat test) and TC (thermal cycling test) tests. The power attenuation results of the specific module reliability test are shown in Table 1.

[0057] Table 1 Test Results

[0058] analyze: As shown in Table 1, the power attenuation of the component in Example 1 met the test standards after reliability testing, and no abnormalities were found in the EL and IV parameters. In Example 2, the power attenuation of the component met the test standards after reliability testing, and no abnormalities were found in the EL and IV parameters. However, cracks appeared on the surface of the insulating ink, posing a short-circuit risk if testing continued. Increasing the trimethylolpropane triacrylate content and decreasing the talc content in the insulating ink would increase the curing rate and hardness after curing, but it would also increase internal stress, making it prone to cracking during reliability testing. In Comparative Example 1, the power attenuation of the component met the test standards after reliability testing, and no abnormalities were found in the EL and IV parameters, but the insulating strip had already… Delamination occurred, posing a short-circuit risk to continued testing. Comparative Example 2 involved removing a photoinitiator, which resulted in poor or incomplete curing of the insulating ink during curing, leading to insufficient strength of the insulating ink itself. This resulted in significant power attenuation during component reliability testing and individual short circuits in the EL (electroluminescent plate). Therefore, 2-ethylanthraquinone cannot be removed alone. Comparative Example 3 involved removing a highly efficient photoinitiator, which also resulted in poor or incomplete curing of the insulating ink during curing, leading to insufficient strength of the insulating ink itself. This resulted in significant power attenuation during component reliability testing and multiple short circuits in the EL (electroluminescent plate). Therefore, 1-hydroxycyclohexylphenyl ketone cannot be completely removed. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0059] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for manufacturing a photovoltaic module with concealed busbars, characterized in that, include: Insulating ink is applied to the welding positions of the fine grid lines and busbars on the back of the battery cell, and the first curing is performed to obtain the first cured battery cell; Solder paste is applied to the main grid Pad points on the back of the first cured battery cell, and a second curing is performed to obtain the second cured battery cell. The second cured battery cell is diced and welded with solder strips to obtain a welded battery cell. The welded battery cells, the first encapsulant film, and the first glass are stacked in sequence, and the busbars are placed on the insulating ink of the welded battery cells. The stacked batteries are then welded together to obtain a stacked battery string. The stacked battery string, the second encapsulant film, and the second glass are then stacked in sequence and encapsulated and laminated to obtain a photovoltaic module.

2. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that, The raw materials for the insulating ink, based on a total mass of 100%, include: The composition includes 30%-50% phenolic epoxy acrylic oligomer, 2%-8% photoinitiator, 10%-15% polyfunctional monomer, 5%-10% monofunctional monomer, 20%-37% filler, 0.5%-2% thickener, 0.1%-2% pigment, and 0.5%-2% adhesion promoter.

3. The method for preparing a photovoltaic module with hidden busbars according to claim 2, characterized in that, At least one of the following conditions must be met: A. The photoinitiator comprises 2-ethylanthraquinone and / or 1-hydroxycyclohexylphenyl ketone; B. The multifunctional monomer includes trimethylolpropane triacrylate.

4. The method for preparing a photovoltaic module with hidden busbars according to claim 2, characterized in that, At least one of the following conditions must be met: A. The monofunctional monomer includes hydroxyethyl methacrylate; B. The filler includes talc and / or silica.

5. The method for preparing a photovoltaic module with hidden busbars according to claim 2, characterized in that, The thickener includes bentonite.

6. The method for preparing a photovoltaic module with hidden busbars according to claim 2, characterized in that, The pigment includes phthalocyanine green G.

7. The method for preparing a photovoltaic module with hidden busbars according to claim 2, characterized in that, The adhesion promoter includes dimethylpolysiloxane.

8. The method for preparing a photovoltaic module with hidden busbars according to claim 2, characterized in that, The raw materials for the insulating ink, based on a total mass of 100%, include: The composition includes 30%-50% phenolic epoxy acrylate oligomer, 1%-3% 2-ethylanthraquinone, 1%-5% 1-hydroxycyclohexylphenyl ketone, 10%-15% trimethylolpropane triacrylate, 5%-10% hydroxyethyl methacrylate, 20%-35% talc, 0.1%-2% silica, 0.5%-2% bentonite, 0.1%-2% phthalocyanine green G, and 0.5%-2% dimethicone.

9. A photovoltaic module with concealed busbars, characterized in that, The photovoltaic module with hidden busbars is prepared by the method described in any one of claims 1-8.

10. A photovoltaic device, characterized in that, The photovoltaic module including the hidden busbar as described in claim 9.

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