Passivation agent for solar cells and its application and TopCon solar cell passivation method

Abstract

The present invention provides a passivator for solar cells, its application, and a TopCon solar cell passivation method, relating to the technical field of solar cells. The passivator comprises the following components: a polytetrafluoroethylene (PTFE) dispersion and metal oxide nanoparticles; the metal oxide nanoparticles include at least one of aluminum oxide nanoparticles and magnesium oxide nanoparticles. PTFE has a good passivation effect, aluminum oxide nanoparticles have excellent thermal stability, and nano-magnesium oxide has strong antioxidant and corrosion inhibition capabilities. The passivator for solar cells provided by the present invention is formed by adding metal oxide nanoparticles to the PTFE dispersion, resulting in a good passivation effect, reduced edge leakage current, and improved cell efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, in particular to a passivating agent for solar cells and application thereof, and a TopCon solar cell passivation method. Background Art

[0002] TopCon solar cells require laser cutting during the module manufacturing process. The cut cell strips are then connected to the positive and negative electrodes using solder ribbons to form a cell string. The cell string is then processed to form a battery module. The laser cutting process can cause some damage to the cells, resulting in reduced efficiency.

[0003] In existing passivation technologies, TopCon solar cells cut through laser non-destructive cutting typically utilize ALD technology to deposit an aluminum oxide film on the cut surfaces. However, ALD equipment is expensive to manufacture and maintain, and the lack of specialized gas supply at the module end prevents it from meeting cleanliness requirements. Furthermore, the ALD process is lengthy, and the high temperatures experienced during operation can affect cell efficiency to varying degrees. Consequently, existing TopCon solar cells cut through laser non-destructive cutting are susceptible to damage at the cut edges, resulting in significant cell leakage at the cut edges, impacting cell efficiency. Existing passivation technologies are also costly and complex.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] One of the objectives of the present invention is to provide a passivator for solar cells, comprising the following components: a polytetrafluoroethylene (PTFE) dispersion and metal oxide nanoparticles; the metal oxide nanoparticles include at least one of aluminum oxide nanoparticles and magnesium oxide nanoparticles. PTFE exhibits excellent passivation properties, aluminum oxide nanoparticles have excellent thermal stability, and nano-magnesium oxide exhibits strong antioxidant and corrosion inhibition capabilities. The present invention provides a passivator for solar cells by adding metal oxide nanoparticles to a PTFE dispersion, resulting in a strong passivation effect, reduced edge leakage current, and improved cell efficiency.

[0006] A second object of the present invention is to provide an application of the solar cell passivator in passivating solar cells.

[0007] A third objective of the present invention is to provide a TopCon solar cell passivation method. The TopCon solar cell passivation method comprises the following steps: applying the aforementioned solar cell passivator to the cut surfaces of the cell strips to passivate the cell strips. Passivating the cell strips with the passivator can passivate exposed dangling bonds, minimizing cutting damage, thereby reducing edge leakage current and improving cell efficiency.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0009] In a first aspect, the present invention provides a passivator for a solar cell, wherein the passivator for a solar cell comprises the following components:

[0010] polytetrafluoroethylene dispersion and metal oxide nanoparticles;

[0011] Wherein, the metal oxide nanoparticles include at least one of aluminum oxide nanoparticles and magnesium oxide nanoparticles.

[0012] In the present invention, the passivation component adopts polytetrafluoroethylene dispersion. The large binding energy of CF bond in polytetrafluoroethylene makes it have good heat resistance, and the physical and chemical properties of the passivation liquid components can be maintained during the subsequent drying process. In addition, the fluorine atoms are negatively charged, which effectively shields the positive charge of the main chain carbon atoms. At the same time, the negative charge they carry can form a negative electric field on the surface of the cutting surface, preventing electrons from flowing out of the cutting edge of the battery, increasing the parallel resistance and reducing the leakage current, and playing a better passivation role. Moreover, the fluorine atoms are large in size and repel each other with the same charge, so that the molecular chain cannot be in a planar zigzag shape but in a spiral twisted shape. The complex molecular chain shape can protect the cutting surface of the battery. It can effectively adhere to maintain the adhesion strength of the passivation solution. On the other hand, the complex molecular chain shape can also better wrap the aluminum oxide nanoparticles and magnesium oxide nanoparticles, prevent the nanoparticles from agglomerating, and maintain the stability of the passivation solution; nano-aluminum oxide has excellent thermal stability, outstanding chemical inertness and excellent electrical insulation properties. While maintaining the stability of the passivation organization, it can avoid the reduction of parallel resistance caused by the component manufacturing process and maintain the battery efficiency; nano-magnesium oxide has strong antioxidant and corrosion inhibition capabilities, which can protect the passivation solution from being oxidized during the drying process. At the same time, its excellent stability can avoid damage to the passivation organization during the component manufacturing process.

[0013] Preferably, the weight ratio of polytetrafluoroethylene to metal oxide nanoparticles is (2:1)-(1:1). In the present invention, the weight ratio of solute polytetrafluoroethylene to metal oxide nanoparticles in the dispersion can be, for example, 2:1, 1.5:1, 1:1, etc.

[0014] Preferably, the concentration of the polytetrafluoroethylene dispersion is 10%-30%, for example, it can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, etc.

[0015] Preferably, the polytetrafluoroethylene dispersion is synthesized by low-pressure dispersion polymerization.

[0016] In the present invention, a low-pressure dispersion polymerization method is adopted to prepare a polytetrafluoroethylene dispersion. The prepared dispersion has high film-forming property, good crack resistance and good repairing and passivating effect on cutting edges.

[0017] Preferably, the weight ratio of the aluminum oxide nanoparticles to the magnesium oxide nanoparticles is (1:1)-(3:1), for example, 1:1, 2:1, 3:1, etc.

[0018] Preferably, the particle size of the aluminum oxide nanoparticles is 10 nm to 30 nm, for example, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm, 20 nm, 21 nm, 22 nm, 23 nm, 24 nm, 25 nm, 26 nm, 27 nm, 28 nm, 29 nm, 30 nm, etc.

[0019] Preferably, the particle size of the magnesium oxide nanoparticles is 10 nm to 30 nm, for example, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm, 20 nm, 21 nm, 22 nm, 23 nm, 24 nm, 25 nm, 26 nm, 27 nm, 28 nm, 29 nm, 30 nm, etc.

[0020] Preferably, the solid content of the passivator for solar cells is 20% to 40%, for example, it can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, or 40%.

[0021] In a second aspect, the present invention provides a use of the aforementioned passivator for solar cells in passivating solar cells.

[0022] In a third aspect, the present invention provides a TopCon solar cell passivation method, the TopCon solar cell passivation method comprising the following steps:

[0023] The solar cell passivator is applied to the cut surface of the cell strip after cutting to passivate the cell strip.

[0024] In the present invention, a passivating agent is applied to the cut surface of the laminated battery strip to passivate the exposed dangling bonds, reduce cutting damage, and thus reduce edge leakage current and improve battery efficiency.

[0025] Preferably, the coating thickness of the passivator for solar cells is 0.05-0.2 mm, for example, it can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, etc.

[0026] Preferably, a laser is used to cut the battery sheet to obtain a plurality of battery strips;

[0027] Preferably, a non-destructive laser process is used to cut the cell;

[0028] Preferably, the temperature of the cutting process is 150-250° C., for example, 150° C., 160° C., 170° C., 180° C., 190° C., 200° C., 210° C., 220° C., 230° C., 240° C., 250° C., etc., and the power range is 5-50W, for example, 5W, 10W, 15W, 20W, 25W, 30W, 35W, 40W, 45W, 50W, etc.;

[0029] Preferably, the two ends of the battery cell are grooved relative to each other, and the groove length is 0-3 mm, for example, 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0030] In this invention, a laser non-destructive cutting process is used to cut the cell. Slots are cut through the cell's thickness at both ends, with the two slots facing each other. Laser heating is used between the slots, followed by water cooling, which breaks the cell apart to form a strip. This laser non-destructive cutting method cuts the entire cell, creating a smooth cut surface and ensuring uniformity during subsequent liquid-phase passivation coating.

[0031] Preferably, the TopCon solar cell passivation method further comprises the following steps: before applying the passivating agent to the cell strips, performing a lamination and pressurization process on the cut cell strips;

[0032] In the present invention, the cut battery strips are laminated and pressurized before being coated with the passivating agent, which can improve the coating efficiency and prevent the passivating liquid from penetrating into the front and back sides of the battery strips and affecting the battery grid lines.

[0033] Preferably, during the lamination pressurization process, the applied pressure is greater than or equal to 200N, for example, 200N, 250N, 300N, etc.;

[0034] Preferably, during the lamination and pressurization process, the number of battery strips is greater than or equal to 2, for example, it can be 2, 10, 50, 100, 150, 200, etc.

[0035] Preferably, the TopCon solar cell passivation method further comprises the following steps: drying the cell strip after the passivation agent is applied to obtain a passivated cell strip;

[0036] Preferably, the battery strip after applying the passivating agent is dried under a nitrogen atmosphere;

[0037] Preferably, the flow rate of the nitrogen is 10-15 L / min, for example, it can be 10 L / min, 11 L / min, 12 L / min, 13 L / min, 14 L / min, 15 L / min, etc.;

[0038] Preferably, the drying temperature is 80-100°C, for example, 80°C, 85°C, 90°C, 95°C, 100°C, etc.

[0039] Preferably, the drying time is 1-3 minutes, for example, 1 minute, 1.5 minutes, 2 minutes, 2.5 minutes, 3 minutes, etc.

[0040] In the present invention, the battery strip coated with the passivator is dried at a certain temperature so as to facilitate processing of the component end.

[0041] Furthermore, the TopCon solar cell passivation method comprises the following steps:

[0042] (1) Using laser non-destructive cutting to cut the entire cell to obtain a smooth cutting edge;

[0043] Among them, the laser non-destructive cutting process temperature is 150-250℃, the power is 5-50W, and the length of the slots at both ends of the laser non-destructive cutting is 0-3mm;

[0044] (2) Laminating and pressing the cut battery strips;

[0045] The number of battery strips in the stacking and pressurizing process is greater than or equal to 2, and the applied pressure is greater than or equal to 200N;

[0046] (3) applying a passivating agent to the cut surface of the laminated battery strip to passivate edge defects;

[0047] The passivation agent comprises a polytetrafluoroethylene dispersion and metal oxide nanoparticles, wherein the metal oxide nanoparticles include at least one of aluminum oxide nanoparticles and magnesium oxide nanoparticles; the weight ratio of polytetrafluoroethylene to metal oxide nanoparticles is (2:1)-(1:1); the polytetrafluoroethylene dispersion is synthesized by low-pressure dispersion polymerization, and the concentration of the dispersion is 10%-30%; the particle size of the aluminum oxide nanoparticles and the magnesium oxide nanoparticles is 10nm-30nm, and the weight ratio of the two is (1:1)-(3:1); the solid content of the passivation agent is 20%-40%; and the coating thickness of the passivation solution is 0.05-0.2mm;

[0048] (4) drying the battery strip coated with the passivation agent under a nitrogen atmosphere to obtain a repaired battery strip;

[0049] The nitrogen flow rate is 10-15 L / min; the drying temperature is 80-100°C; and the drying time is 1-3 min.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] In the solar cell passivator provided by the present invention, polytetrafluoroethylene has a good passivation effect, aluminum oxide nanoparticles have excellent thermal stability, and nano-magnesium oxide has strong antioxidant and corrosion inhibition capabilities. The passivator is formed by adding metal oxide nanoparticles to a polytetrafluoroethylene dispersion, has strong passivation performance, can reduce edge leakage current, and improve battery efficiency.

[0052] The TopCon solar cell passivation method provided by the present invention adopts the method of directly coating the cut surface of the TopCon solar cell with a liquid phase passivation liquid to reduce cutting damage on the cut edge of the cell. In addition, the present invention does not require the addition of large-scale coating equipment, has low cost, simple operation, short process time, high production efficiency, and is not affected by high temperature during operation, thereby improving the passivation effect. DETAILED DESCRIPTION

[0053] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear; however, in the event of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, the use of "or" means "and / or" unless otherwise stated. In addition, the use of the term "including" and other forms is non-limiting.

[0054] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] The present invention is further described below by way of examples. Unless otherwise specified, the materials in the examples were prepared according to existing methods or directly purchased from the market.

[0056] Example 1

[0057] This embodiment provides a passivator for solar cells, comprising a polytetrafluoroethylene dispersion and aluminum oxide nanoparticles in a weight ratio of 2:1. The concentration of the polytetrafluoroethylene dispersion is 10%, and the polytetrafluoroethylene dispersion is synthesized by low-pressure dispersion polymerization. The particle size of the aluminum oxide nanoparticles is 10 nm. The solid content of the passivator for solar cells is 40%.

[0058] Example 2

[0059] This embodiment provides a passivator for solar cells, comprising a polytetrafluoroethylene dispersion and magnesium oxide nanoparticles in a weight ratio of 1:1. The concentration of the polytetrafluoroethylene dispersion is 30%, and the polytetrafluoroethylene dispersion is synthesized by low-pressure dispersion polymerization. The magnesium oxide nanoparticles have a particle size of 30 nm. The solid content of the passivator for solar cells is 20%.

[0060] Example 3

[0061] This embodiment provides a passivator for solar cells, comprising a polytetrafluoroethylene dispersion and metal oxide nanoparticles in a weight ratio of 1.5:1, wherein the metal oxide nanoparticles include aluminum oxide nanoparticles and magnesium oxide nanoparticles in a weight ratio of 1:1. The concentration of the polytetrafluoroethylene dispersion is 20%, and the polytetrafluoroethylene dispersion is synthesized by low-pressure dispersion polymerization. The particle size of the aluminum oxide nanoparticles and the magnesium oxide nanoparticles is 20 nm. The solid content of the passivator for solar cells is 30%.

[0062] Example 4

[0063] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 3 is that the metal oxide nanoparticles include aluminum oxide nanoparticles and magnesium oxide nanoparticles in a weight ratio of 3:1. The rest is the same as embodiment 3.

[0064] Example 5

[0065] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 3 is that the metal oxide nanoparticles include aluminum oxide nanoparticles and magnesium oxide nanoparticles in a weight ratio of 2:1. The rest is the same as embodiment 3.

[0066] Example 6

[0067] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the weight ratio of polytetrafluoroethylene to metal oxide nanoparticles is 3:1, and the rest is the same as embodiment 5.

[0068] Example 7

[0069] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the weight ratio of polytetrafluoroethylene to metal oxide nanoparticles is 0.5:1, and the rest is the same as embodiment 5.

[0070] Example 8

[0071] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the concentration of the polytetrafluoroethylene dispersion is 35%, and the rest is the same as embodiment 5.

[0072] Example 9

[0073] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the concentration of the polytetrafluoroethylene dispersion is 5%, and the rest is the same as embodiment 5.

[0074] Example 10

[0075] This embodiment provides a passivating agent for solar cells. The difference between this embodiment and embodiment 5 is that the particle size of the aluminum oxide nanoparticles and the magnesium oxide nanoparticles are both 50 nm, and the rest is the same as embodiment 5.

[0076] Example 11

[0077] This embodiment provides a passivating agent for solar cells. The difference between this embodiment and embodiment 5 is that the particle sizes of the aluminum oxide nanoparticles and the magnesium oxide nanoparticles are both 5 nm, and the rest are the same as embodiment 5.

[0078] Example 12

[0079] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the weight ratio of aluminum oxide nanoparticles to magnesium oxide nanoparticles is 1:2, and the rest is the same as embodiment 5.

[0080] Example 13

[0081] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the solid content of the passivator for solar cells is 45%, and the rest is the same as embodiment 5.

[0082] Example 14

[0083] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the solid content of the passivator for solar cells is 10%, and the rest is the same as embodiment 5.

[0084] Example 15

[0085] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the coating thickness of the passivation solution is 0.5 mm, and the rest is the same as embodiment 5.

[0086] Example 16

[0087] This embodiment provides a passivator for solar cells. The difference between this embodiment and embodiment 5 is that the coating thickness of the passivation solution is 0.01 mm, and the rest is the same as embodiment 5.

[0088] Example 17

[0089] This embodiment provides a TopCon solar cell passivation method, comprising the following steps:

[0090] (1) Using laser non-destructive cutting to cut the entire cell to obtain a smooth cutting edge;

[0091] The laser non-destructive cutting process is performed at a temperature of 150°C and a power of 50W. The laser non-destructively cuts the battery at the location to be cut, thereby cutting the battery cell into battery strips.

[0092] (2) Laminating and pressing the cut battery strips;

[0093] Among them, the number of battery strips in the stacking and pressurizing process is 200, and the applied pressure is equal to 200N;

[0094] (3) Applying the passivating agent in Example 5 to the cut surface of the laminated battery strip to passivate the edge defects;

[0095] Among them, the coating thickness of the passivation agent is 0.05mm;

[0096] (4) drying the battery strip coated with the passivation agent under a nitrogen atmosphere to obtain a repaired battery strip;

[0097] The nitrogen flow rate is 10 L / min; the drying temperature is 100° C.; and the drying time is 1 min.

[0098] Example 18

[0099] This embodiment provides a TopCon solar cell passivation method, comprising the following steps:

[0100] (1) Using laser non-destructive cutting to cut the entire cell to obtain a smooth cutting edge;

[0101] The laser non-destructive cutting process temperature is 250°C, the power is 5W, and the length of the slots at both ends of the laser non-destructive cutting is 3mm.

[0102] (2) Laminating and pressing the cut battery strips;

[0103] Among them, the number of battery strips in the stacking and pressurizing process is 250, and the applied pressure is equal to 250N;

[0104] (3) Applying the passivating agent in Example 5 to the cut surface of the laminated battery strip to passivate the edge defects;

[0105] Among them, the coating thickness of the passivation agent is 0.2mm;

[0106] (4) drying the battery strip coated with the passivation agent under a nitrogen atmosphere to obtain a repaired battery strip;

[0107] The nitrogen flow rate is 15 L / min; the drying temperature is 80°C; and the drying time is 3 min.

[0108] Examples 19-34

[0109] This embodiment provides a TopCon solar cell passivation method, comprising the following steps:

[0110] (1) Using laser non-destructive cutting to cut the entire cell to obtain a smooth cutting edge;

[0111] The laser non-destructive cutting process temperature is 200°C, the power is 20W, and the length of the slots at both ends of the laser non-destructive cutting is 2mm.

[0112] (2) Laminating and pressing the cut battery strips;

[0113] Among them, the number of battery strips in the stacking pressurization process is 200, and the applied pressure is equal to 250N;

[0114] (3) The passivating agents of Examples 1-16 were applied to the cut surfaces of the laminated battery strips to passivate the edge defects;

[0115] Among them, the coating thickness of the passivation agent is 0.1mm;

[0116] (4) drying the battery strip coated with the passivation agent under a nitrogen atmosphere to obtain a repaired battery strip;

[0117] The nitrogen flow rate is 11 L / min, the drying temperature is 90°C, and the drying time is 2 min.

[0118] Example 35

[0119] This embodiment provides a TopCon solar cell passivation method, which differs from Example 23 in that the nitrogen flow rate is 5 L / min, and the rest is consistent with Example 23.

[0120] Example 36

[0121] This embodiment provides a TopCon solar cell passivation method, which differs from Example 23 in that the drying temperature is 150° C., and the rest is the same as Example 23.

[0122] Example 37

[0123] This embodiment provides a TopCon solar cell passivation method, which differs from Example 23 in that the drying time is 10 minutes, and the rest is the same as Example 23.

[0124] Comparative Example 1

[0125] This comparative example provides a passivator for solar cells, which differs from Example 5 in that its components do not contain metal oxide nanoparticles, and the rest are consistent with Example 5.

[0126] Comparative Example 2

[0127] This comparative example provides a passivator for solar cells, which differs from Example 5 in that its components do not contain polytetrafluoroethylene dispersion, and the rest are consistent with Example 5.

[0128] Comparative Examples 3-4

[0129] This comparative example provides a TopCon solar cell passivation method, in which the passivating agents in comparative examples 1-2 are respectively applied to the cut surfaces of the laminated cell strips to passivate the edge defects, and the remaining steps are consistent with those in Example 23.

[0130] Test Case

[0131] Test samples: TopCon solar cells passivated in Examples 17-34 and TopCon solar cells passivated in Comparative Examples 3-4.

[0132] Test method: The cut battery strips are spliced into complete battery sheets and tested in an IV tester.

[0133] The test results are shown in Table 1.

[0134] Table 1

[0135]

[0136]

[0137] It can be seen from the data in Table 1 that, according to the data in Examples 19-23, when aluminum oxide nanoparticles and magnesium oxide nanoparticles are used in combination, the efficiency of the cell is better; according to Examples 24-37 and Comparative Examples 3-4, the efficiency of the cell is better when the passivating agent provided by the present invention and the relevant parameters in the passivation method provided by the present invention are used.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A TopCon solar cell passivation method, characterized in that: The TopCon solar cell passivation method comprises the following steps: applying a solar cell passivator to the cut surfaces of the cut cell strips to passivate the cell strips; The solar cell passivator comprises the following components: polytetrafluoroethylene dispersion and metal oxide nanoparticles; Wherein, the metal oxide nanoparticles include aluminum oxide nanoparticles and magnesium oxide nanoparticles; The weight ratio of polytetrafluoroethylene and metal oxide nanoparticles is (2:1)-(1:1); The weight ratio of the aluminum oxide nanoparticles to the magnesium oxide nanoparticles is (1:1)-(3:1); The cell sheet is cut by laser to obtain a plurality of cell strips. The TopCon solar cell passivation method further comprises the following steps: before applying a passivating agent to the cell strips, the cut cell strips are laminated and pressurized; during the lamination and pressurization process, the applied pressure is greater than or equal to 200N.

2. The TopCon solar cell passivation method according to claim 1, characterized in that: The concentration of the polytetrafluoroethylene dispersion is 10%-30%.

3. The TopCon solar cell passivation method according to claim 1, characterized in that: The polytetrafluoroethylene dispersion is synthesized by low-pressure dispersion polymerization.

4. The TopCon solar cell passivation method according to claim 1, characterized in that: The particle size of the aluminum oxide nanoparticles is 10 nm to 30 nm.

5. The TopCon solar cell passivation method according to claim 1, characterized in that The particle size of the magnesium oxide nanoparticles is 10nm-30nm.

6. The TopCon solar cell passivation method according to claim 1, characterized in that: The solid content of the passivator for solar cells is 20%-40%.

7. The TopCon solar cell passivation method according to claim 1, characterized in that: The coating thickness of the solar cell passivator is 0.05-0.2 mm.

8. The TopCon solar cell passivation method according to claim 1, characterized in that: The battery cells are cut using a non-destructive laser process.

9. The TopCon solar cell passivation method according to claim 1, characterized in that: The temperature of the cutting process is 150-250℃ and the power range is 5-50W.

10. The TopCon solar cell passivation method according to claim 1, characterized in that: The two ends of the battery cell are grooved relative to each other, and the groove length is 0-3mm.

11. The TopCon solar cell passivation method according to claim 1, characterized in that: During the lamination and pressurization process, the number of battery strips is greater than or equal to 2.

12. The TopCon solar cell passivation method according to claim 1, characterized in that: The TopCon solar cell passivation method further comprises the following steps: drying the cell strip after the passivation agent is applied to obtain the passivated cell strip.

13. The TopCon solar cell passivation method according to claim 12, characterized in that: The battery strips after the passivation agent was applied were dried under a nitrogen atmosphere.

14. The TopCon solar cell passivation method according to claim 13, characterized in that: The flow rate of the nitrogen is 10-15 L / min.

15. The TopCon solar cell passivation method according to claim 13, characterized in that: The drying temperature is 80-100℃.

16. The TopCon solar cell passivation method according to claim 13, characterized in that: The drying time is 1-3 minutes.

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