An insulating glue, grid line, cell and photovoltaic module

Abstract

The application provides an insulating glue, a grid line, a battery piece and a photovoltaic module, and relates to the technical field of photovoltaics. The raw materials of the insulating glue include, by weight, 30-50 parts of acrylate, 15-30 parts of methyl vinyl silicone rubber, 10-20 parts of rosin resin, 3-8 parts of hydroxyl silicone oil, 5-12 parts of aluminum oxide, 5-10 parts of tackifier, 2-4 parts of coupling agent, 1-3 parts of initiator and 5-20 parts of organic solvent. The insulating glue plays a protective role on the grid line matrix, reduces the corrosion of acidic substances on the grid line, and improves the reliability of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more particularly to an insulating adhesive, grid wires, solar cells, and photovoltaic modules. Background Technology

[0002] As a clean energy source, photovoltaics is gradually becoming an important force in the global energy structure transformation. However, the corrosion problem of photovoltaic equipment has always been a focus of attention in the industry.

[0003] Currently, the following approaches are being used to improve the weather resistance of photovoltaic modules:

[0004] Optimize battery slurry formulation to improve slurry acid resistance;

[0005] Improve the encapsulation performance of encapsulation materials, such as reducing water vapor permeability and reducing acidic substances in the film.

[0006] However, while improving the acid resistance of the battery paste itself can help reduce battery grid corrosion, it cannot prevent external moisture from corroding the battery cells. In a long-term humid and hot environment, the battery grid will gradually be corroded. Improving the encapsulation performance of the encapsulation material itself cannot achieve a good encapsulation effect on the battery grid. Furthermore, the hydrolysis of EVA encapsulation film produces acetic acid, which is more likely to corrode the battery grid.

[0007] Therefore, there is an urgent need to provide a new solution to address the above problems. Summary of the Invention

[0008] The purpose of this application is to provide an insulating adhesive, grid wires, solar cells, and photovoltaic modules to solve the above-mentioned problems.

[0009] To achieve the above objectives, the first aspect of this application provides an insulating adhesive, the raw materials of which, by weight, comprise:

[0010] Acrylic ester 30-50 parts, methyl vinyl silicone rubber 15-30 parts, rosin resin 10-20 parts, hydroxyl silicone oil 3-8 parts, aluminum oxide 5-12 parts, tackifier 5-10 parts, coupling agent 2-4 parts, initiator 1-3 parts, organic solvent 5-20 parts.

[0011] Optionally, the aluminum oxide includes nano-sized aluminum oxide.

[0012] Optionally, the tackifier includes alkylphenol resin.

[0013] Optionally, the coupling agent includes a silane coupling agent.

[0014] Optionally, the insulating adhesive satisfies at least one of the following conditions:

[0015] A. The initiator comprises dicyclohexyl peroxide dicarbonate;

[0016] B. The organic solvents include xylene and / or toluene.

[0017] A second aspect of this application provides a grid wire made from the insulating adhesive described above.

[0018] Optionally, it includes a gate wire substrate and an insulating layer disposed on the surface of the gate wire substrate;

[0019] The raw material for the insulating layer includes the insulating adhesive.

[0020] Optionally, the thickness of the insulating layer is 0.5μm-2μm.

[0021] A third aspect of this application provides a battery cell including the aforementioned grid lines.

[0022] A fourth aspect of this application provides a photovoltaic module, including the aforementioned solar cells.

[0023] Compared with the prior art, the beneficial effects of this application include:

[0024] The insulating adhesive provided in this application not only effectively prevents the flow of current, avoiding current leakage and short circuits between electrical equipment or electronic components, but also resists corrosion from chemical substances such as acids and alkalis, enabling it to function as an insulator in various chemical environments. Furthermore, it possesses excellent conformability and integrity, allowing it to tightly adhere to the shape of the object being covered. The tackifier ensures good adhesion in high-temperature and high-humidity environments; the coupling agent improves bonding strength, water resistance, high-temperature resistance, and weather resistance; aluminum oxide enhances the adhesive's acid resistance and mechanical strength while maintaining transparency; and acrylates improve... The insulating properties enhance adhesion, temperature resistance, and abrasion resistance, while also improving impact resistance and thermal conductivity. This plays a crucial role in the insulation protection and performance stability of electronic equipment. Methyl vinyl silicone rubber possesses excellent temperature resistance, weather resistance, electrical insulation properties, and chemical stability. Rosin resin in insulating adhesives mainly plays multiple roles, including insulation, protection, tackification, and improvement of mechanical properties. Hydroxyl silicone oil can improve processing performance, increase transparency, and enhance electrical insulation. Each of the above components has its own physical and chemical properties, and together they work to ensure the excellent acid resistance, heat resistance, and abrasion resistance of the insulating adhesive.

[0025] The grid wires provided in this application have an insulating adhesive that protects the grid wire substrate, reduces corrosion of the grid wires by acidic substances, and improves the reliability of the photovoltaic module.

[0026] The solar cells and photovoltaic modules provided in this application have a long service life. Attached Figure Description

[0027] 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.

[0028] Figure 1 The images show actual photos of the grid line provided in Example 1 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0029] Figure 2 The images show actual photos of the grid line provided in Example 2 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0030] Figure 3 The images show actual photos of the grid line provided in Example 3 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0031] Figure 4 The images show actual photos of the grid lines provided for Comparative Example 1 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0032] Figure 5 The images show the actual grid lines provided for Comparative Example 2 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0033] Figure 6 The images show actual photos of the grid lines provided for Comparative Example 3 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0034] Figure 7 The images show actual photos of the grid lines provided for Comparative Example 4 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0035] Figure 8 The images show actual photos of the grid lines provided for Comparative Example 5 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0036] Figure 9 The images show actual photos of the grid lines provided for Comparative Example 6 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing.

[0037] Figure 10 The images show the actual grid lines provided for Comparative Example 7 after being coated with acetic acid and left to stand for 3 days for EL testing, and after undergoing DH1000h for EL testing. Detailed Implementation

[0038] As used in this article:

[0039] "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.

[0040] 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.

[0041] 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.

[0042] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0043] "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 (K is any number representing a multiplier). It is important to understand that, unlike the number of parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0044] "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).

[0045] A solar cell is a thin film of photoelectric semiconductor that generates electricity directly from sunlight. It is a device that converts light energy into electrical energy directly through the photoelectric effect or photochemical effect.

[0046] Battery corrosion in humid and hot environments: grid line corrosion. Under high temperature and high humidity conditions, acidic substances combined with water vapor react with aluminum, lead oxide, and other materials in the battery slurry, damaging their contact effect, weakening ohmic contacts, and leading to a decrease in the electrical performance of the battery cells.

[0047] Based on this, the first aspect of this application provides an insulating adhesive, the raw materials of which, by weight, comprise:

[0048] Acrylic ester 30-50 parts, methyl vinyl silicone rubber 15-30 parts, rosin resin 10-20 parts, hydroxyl silicone oil 3-8 parts, aluminum oxide 5-12 parts, tackifier 5-10 parts, coupling agent 2-4 parts, initiator 1-3 parts, organic solvent 5-20 parts.

[0049] Optionally, the raw materials of the insulating adhesive, by weight, may be: acrylate (any value between 30, 35, 40, 45, 50 parts or 30-50 parts); methyl vinyl silicone rubber (any value between 15, 20, 25, 30 parts or 15-30 parts); rosin resin (any value between 10, 15, 20 parts or 10-20 parts); and hydroxyl silicone oil (any value between 3, 4, 5, 6, 7, 8 parts or 3-8 parts). Any value of aluminum oxide can be 5 parts, 7 parts, 9 parts, 10 parts, 12 parts or any value between 5 and 12 parts; any value of tackifier can be 5 parts, 7 parts, 9 parts, 10 parts or any value between 5 and 10 parts; any value of coupling agent can be 2 parts, 3 parts, 4 parts or any value between 2 and 4 parts; any value of initiator can be 1 part, 2 parts, 3 parts or any value between 1 and 3 parts; any value of organic solvent can be 5 parts, 10 parts, 15 parts, 20 parts or any value between 5 and 20 parts.

[0050] In some embodiments, the aluminum oxide comprises nano-sized aluminum oxide.

[0051] It should be noted that nano-sized aluminum oxide powder can improve the acid resistance and mechanical strength of the adhesive while maintaining its transparency.

[0052] In some embodiments, the tackifier comprises an alkylphenol resin.

[0053] It should be noted that alkylphenol resins have good resistance to acids, alkalis, ketones and organic solvents, maintain good stability and mechanical strength at high temperatures, and have excellent insulation properties, as well as good wear resistance and abrasion resistance, which allows the adhesive to maintain good bonding performance in high temperature and high humidity environments.

[0054] In some embodiments, the coupling agent comprises a silane coupling agent.

[0055] It should be noted that silane coupling agents can improve the bonding strength, water resistance, high temperature resistance, and weather resistance of transparent adhesives.

[0056] In some embodiments, the insulating adhesive satisfies at least one of the following conditions:

[0057] A. The initiator comprises dicyclohexyl peroxide dicarbonate;

[0058] B. The organic solvents include xylene and / or toluene.

[0059] Preferably, the organic solvent includes toluene. When toluene is used as a solvent, the gel layer is colorless and transparent, without shrinkage, yellowing, or cracking.

[0060] A second aspect of this application provides a grid wire made from the insulating adhesive described above.

[0061] It is important to note that the function of the battery grid lines is to collect charge carriers, combine them, and output electrical energy in series.

[0062] In some embodiments, it includes a gate wire substrate and an insulating layer disposed on the surface of the gate wire substrate;

[0063] The raw material for the insulating layer includes the insulating adhesive.

[0064] In some embodiments, the thickness of the insulating layer is 0.5 μm-2 μm.

[0065] Optionally, the thickness of the insulating layer can be any value between 0.5μm, 1μm, 1.5μm, 2μm, or 0.5μm-2μm.

[0066] A third aspect of this application provides a battery cell including the aforementioned grid lines.

[0067] A fourth aspect of this application provides a photovoltaic module, including the aforementioned solar cells.

[0068] It should be noted that a battery assembly consists of a device that connects, encapsulates, and leads current from multiple battery cells.

[0069] 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.

[0070] Example 1

[0071] The first aspect of this embodiment provides an insulating adhesive and its preparation method, wherein the raw materials, by weight, include:

[0072] 40 parts acrylate, 25 parts methyl vinyl silicone rubber, 15 parts rosin resin, 7 parts hydroxyl silicone oil, 10 parts nano-alumina, 7 parts alkylphenol resin (tackifier), 4 parts silane coupling agent, 2 parts dicyclohexyl peroxide (initiator), and 10 parts xylene (organic solvent).

[0073] The above raw materials are mixed to prepare an insulating adhesive.

[0074] The second aspect of this embodiment provides a gate line, the preparation method of which is as follows:

[0075] The insulating adhesive is evenly applied to the battery cell grid line substrate, but no insulating adhesive is applied to the welding points. After curing, the grid line is obtained.

[0076] Example 2

[0077] The difference from Example 1 is that the raw materials of the insulating adhesive, by weight, include:

[0078] 35 parts acrylate, 20 parts methyl vinyl silicone rubber, 12 parts rosin resin, 5 parts hydroxyl silicone oil, 6 parts nano-alumina, 6 parts tackifier, 2 parts coupling agent, 1 part initiator, and 10 parts organic solvent.

[0079] Example 3

[0080] The difference from Example 1 is that the raw materials of the insulating adhesive, by weight, include:

[0081] 45 parts acrylate, 28 parts methyl vinyl silicone rubber, 18 parts rosin resin, 8 parts hydroxyl silicone oil, 10 parts nano-alumina, 8 parts tackifier, 4 parts coupling agent, 1 part initiator, and 18 parts organic solvent.

[0082] Comparative Example 1

[0083] The difference from Example 1 is that no insulating adhesive is provided, and the grid lines are not coated with insulating adhesive.

[0084] Comparative Example 2

[0085] The difference from Example 1 is that the raw materials of the insulating adhesive, by weight, include:

[0086] 25 parts acrylate, 10 parts methyl vinyl silicone rubber, 5 parts rosin resin, 1 part hydroxyl silicone oil, 3 parts nano-alumina, 5 parts tackifier, 1 part coupling agent, 1 part initiator, and 2 parts organic solvent.

[0087] Comparative Example 3

[0088] The difference from Example 1 is that the insulating adhesive does not contain acrylate as a raw material.

[0089] Comparative Example 4

[0090] The difference from Example 1 is that the insulating adhesive does not contain methyl vinyl silicone rubber as a raw material.

[0091] Comparative Example 5

[0092] The difference from Example 1 is that the insulating adhesive does not contain rosin resin.

[0093] Comparative Example 6

[0094] The difference from Example 1 is that the insulating adhesive does not contain hydroxyl silicone oil.

[0095] Comparative Example 7

[0096] The difference from Example 1 is that the insulating adhesive does not contain aluminum oxide as a raw material.

[0097] First, the grid lines were subjected to acid and corrosion resistance tests. The grid lines prepared in the above embodiments and comparative examples were coated with an acidic substance (acetic acid) and assembled into solar cells. The solar cell EL was tested after 3 days. The solar cell EL test is based on the principle of semiconductor light emission. When the surface of the photovoltaic module is irradiated, the photon energy is absorbed by the semiconductor material, and the electrons undergo energy level transitions and generate electron radiation, i.e., light emission. By taking pictures of the module and processing the images, it is analyzed whether the module has defects, such as crystal defects, bubbles, cracks, etc. In this application, the condition of the grid lines prepared in the embodiments and comparative examples after coating with acetic acid for 3 days and then testing the solar cell EL was recorded.

[0098] Secondly, the grid lines obtained in the above embodiments and comparative examples are used to prepare solar cells using the above-described solar cell preparation method, and then assembled into corresponding photovoltaic modules. The photovoltaic module preparation method includes:

[0099] ① Weld the solar cells with solder ribbons (interconnecting strips) (function: to lead the current generated by the solar cells out through the solder ribbons), and then weld the solder ribbons together with the busbars (function: to collect the current in the busbars); ② Place the welded solar cells between two films (front film POE, back film EVA); ③ Lay the glass on the front of the solar cells and the back sheet on the back of the solar cells; ④ Place the sample obtained in "③" in a laminator for lamination, so that the encapsulation film crosslinks and bonds to the solar cells, glass, and back sheet; ⑤ Weld the junction box to the busbars to lead out the solar cells for easy connection with other electrical equipment. After encapsulation, a photovoltaic module is obtained. The obtained photovoltaic module is subjected to DH testing (1000h) and then EL testing. The grid lines that have undergone DH testing (1000h) and then EL testing are recorded for corrosion resistance.

[0100] The DH test is conducted according to the standard IEC61215, with test conditions of 85℃ and 85%RH, to evaluate the long-term outdoor reliability of photovoltaic modules in resisting damp heat. The main failure mode in the DH test is cell grid line corrosion, which causes poor ohmic contact between the cell grid line and the silicon wafer, resulting in reduced output power.

[0101] Example 1 provides an example of the grid lines in a battery cell that has been coated with acetic acid and left to stand for 3 days before EL testing. Figure 1 The left figure shows the actual grid wires provided in Example 1 that were assembled into a battery module and then subjected to DH1000h followed by EL testing. Figure 1 As shown in the right figure.

[0102] Example 2 provides an example of the grid lines in a battery cell after being coated with acetic acid and left to stand for 3 days for EL testing. Figure 2 The left figure shows the actual grid wires provided in Example 2, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 2 As shown in the right figure.

[0103] Example 3 provides an example of the grid lines in a battery cell after being coated with acetic acid and left to stand for 3 days for EL testing. Figure 3 The left figure shows the actual grid wires provided in Example 3, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 3 As shown in the right figure.

[0104] Comparative Example 1 provides actual samples of the grid lines in a battery cell after it has been coated with acetic acid and left to stand for 3 days for EL testing. Figure 4 The left figure shows the actual grid lines provided in Comparative Example 1, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 4 As shown in the right figure.

[0105] Comparative Example 2 provides actual samples of the grid lines in a battery cell after it has been coated with acetic acid and left to stand for 3 days for EL testing. Figure 5 The left figure shows the grid lines provided in Comparative Example 2. The actual grid lines, after being assembled into a battery module and subjected to DH1000h followed by EL testing, are shown below. Figure 5 As shown in the right figure.

[0106] Comparative Example 3 provides actual samples of the grid lines in a solar cell after it has been coated with acetic acid and left to stand for 3 days for EL testing. Figure 6 The left figure shows the actual grid lines provided in Comparative Example 3, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 6 As shown in the right figure.

[0107] Comparative Example 4 provides actual samples of the grid lines in a solar cell after it has been coated with acetic acid and left to stand for 3 days for EL testing. Figure 7 The left figure shows the actual grid lines provided in Comparative Example 4, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 7 As shown in the right figure.

[0108] Comparative Example 5 provides actual samples of the grid lines in a solar cell after it has been coated with acetic acid and left to stand for 3 days for EL testing. Figure 8 The left figure shows the actual grid lines provided in Comparative Example 5, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 8 As shown in the right figure.

[0109] Comparative Example 6 provides actual samples of the grid lines in a solar cell after it has been coated with acetic acid and left to stand for 3 days for EL testing. Figure 9 The left figure shows the actual grid lines provided in Comparative Example 6, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 9 As shown in the right figure.

[0110] Comparative Example 7 provides actual samples of the grid lines in a solar cell after it has been coated with acetic acid and left to stand for 3 days for EL testing. Figure 10 The left figure shows the actual grid lines provided in Comparative Example 7, which were assembled into a battery module and subjected to DH1000h followed by EL testing. Figure 10 As shown in the right figure.

[0111] The electrical performance results of the photovoltaic modules prepared by the grid lines prepared in the above embodiments and comparative examples after DH1000h testing are shown in Table 1.

[0112] Table 1 Performance Tests

[0113] Test sample Power attenuation (%) after DH1000h Example 1 1.27％ Example 2 0.98％ Example 3 1.48％ Comparative Example 1 4.73％ Comparative Example 2 3.57％ Comparative Example 3 4.03％ Comparative Example 4 2.99％ Comparative Example 5 4.38％ Comparative Example 6 4.46％ Comparative Example 7 3.68％

[0114] analyze:

[0115] The test results show that after applying acetic acid and letting it stand for 3 days, the grid lines of Examples 1-3 showed no obvious signs of corrosion and blackening, indicating that the grid lines provided in this application have good corrosion resistance in high temperature and high humidity environments, while Comparative Examples 1-7 showed more obvious signs of corrosion and blackening.

[0116] After testing with DH1000H, the EL test showed that the gate lines of Examples 1-3 showed less corrosion (slight blackening), indicating that the gate lines provided by this application have good acid resistance. In contrast, the gate lines of Comparative Examples 1-7 showed more severe corrosion (severe blackening).

[0117] Based on the power test analysis after DH1000h testing of the embodiments and comparative examples, the power attenuation of the embodiments is all below 1.5%, while the power attenuation of the comparative examples is basically >3%. In terms of power performance after DH1000h testing (the lower the power attenuation, the higher the module power retention rate and the better the module power generation performance), the embodiments are significantly better than the comparative examples.

[0118] 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 them. 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 therein. Such 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.

[0119] 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. An insulating adhesive, characterized in that, Its raw materials, by weight, include: Acrylic ester 30-50 parts, methyl vinyl silicone rubber 15-30 parts, rosin resin 10-20 parts, hydroxyl silicone oil 3-8 parts, aluminum oxide 5-12 parts, tackifier 5-10 parts, coupling agent 2-4 parts, initiator 1-3 parts, organic solvent 5-20 parts.

2. The insulating adhesive according to claim 1, characterized in that, The aluminum oxide includes nano-sized aluminum oxide.

3. The insulating adhesive according to claim 1, characterized in that, The tackifier includes alkylphenol resin.

4. The insulating adhesive according to claim 1, characterized in that, The coupling agent includes a silane coupling agent.

5. The insulating adhesive according to any one of claims 1-4, characterized in that, At least one of the following conditions must be met: A. The initiator comprises dicyclohexyl peroxide dicarbonate; B. The organic solvents include xylene and / or toluene.

6. A grid line, characterized in that, Its raw materials include the insulating adhesive as described in any one of claims 1-5.

7. The gate line according to claim 6, characterized in that, It includes a grid line substrate and an insulating layer disposed on the surface of the grid line substrate; The raw material for the insulating layer includes the insulating adhesive.

8. The gate line according to claim 7, characterized in that, The thickness of the insulating layer is 0.5μm-2μm.

9. A type of battery cell, characterized in that, Includes the gate line as described in any one of claims 6-8.

10. A photovoltaic module, characterized in that, Includes the battery cell as described in claim 9.

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