Battery edge passivation method and solar battery
By using a fluororesin solution containing sulfonic acid groups to contact the cut cell to form a passivation layer, the serious edge recombination effect after solar cell cutting is solved, the conversion efficiency is improved and the process is simplified.
Patent Information
- Application Number
- CN202510063691.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-04-11
AI Technical Summary
The edge compounding effect of existing solar cells after cutting is severe, resulting in a decrease in conversion efficiency, and the existing edge passivation method has complex processes and poor results.
A passivation layer was formed by using a fluororesin solution containing a sulfonic acid group to contact the cut cell to form a passivation layer, and the solvent was blown dry by an inert gas to form a passivation layer of 5-20 nm thick.
The photoelectric conversion efficiency of solar cells is improved, the equipment investment cost is reduced, the process is simple, and the passivation layer is stable.
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Figure CN119815974A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of solar cells, and in particular to a cell edge passivation method and a solar cell. Background Art
[0002] The passivation technology of silicon solar cells has been continuously developing for many years. Combining advanced cell structures with different passivation materials is the key to improving conversion efficiency. Edge passivation also plays an important role in the efficiency of solar cells. Advanced module technologies, such as half-cut, triple-cut or tiled modules, can significantly increase module power. However, the cutting and / or dicing process introduces new unpassivated edges, which can cause additional edge recombination and reduce efficiency potential. For high-efficiency solar cells, such as tunnel oxide passivated contact (TOPCon) cells and silicon heterojunction (SHJ) solar cells, the impact of edge recombination on the absolute efficiency loss after dicing is greater than that of passivated emitter and rear (PERC) cells. When the cell area becomes smaller, the edge recombination effect will be more serious.
[0003] At present, edge passivation methods mostly use the following technical solutions: 1) partially passivate the edge during front-end processing; 2) create a structure to avoid cutting through the emitter area; 3) use advanced cutting methods to reduce laser damage; 4) use Al2O3 to passivate the edge after laser cutting. The first three solutions are more complicated and the passivation effect is not good. The fourth solution usually requires Al2O3 to be deposited under vacuum and heating conditions, and requires post-annealing or heat treatment to activate the passivation, which is also more complicated.
[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Summary of the invention
[0005] The present application provides a battery edge passivation method and a solar cell to solve or alleviate the above-mentioned technical problems. The battery edge passivation method in the technical solution of the present application can improve the conversion efficiency of the solar cell, and the equipment investment cost is low and the process is simple.
[0006] In a first aspect, an embodiment of the present application provides a battery edge passivation method, comprising: Slice the whole battery to obtain battery cells; The cut surface of the cell sheet is contacted with a fluorine-containing resin solution; wherein the fluorine-containing resin solution comprises a sulfonic acid group-containing fluorine resin, a fatty alcohol and water; The cut surface in contact with the fluorine-containing resin solution is blown dry using an inert gas, and a passivation layer is formed on the cut surface after being blown dry.
[0007] Optionally, the fluorine-containing resin solution comprises: 75-80 wt % of sulfonic acid group-containing fluorine resin, 3-8 wt % of fatty alcohol, and the balance of water.
[0008] Optionally, the sulfonic acid group-containing fluorine resin includes perfluorosulfonic acid resin.
[0009] Optionally, the ionomer equivalent weight of the perfluorosulfonic acid resin is 1000-1200.
[0010] Optionally, the molecular weight of the fatty alcohol is less than or equal to 200.
[0011] Optionally, the fatty alcohol includes one or more of methanol, ethanol, propanol, butanol, pentanol, hexanol, ethylene glycol, propylene glycol, butanediol, pentanediol, and hexanediol.
[0012] Optionally, the thickness of the passivation layer is 5-20 nm.
[0013] Optionally, the contact time between the cut surface of the battery cell and the fluorine-containing resin solution is 10-60 seconds.
[0014] Optionally, the inert gas includes one or both of nitrogen and argon.
[0015] In a second aspect, an embodiment of the present application provides a solar cell, which is prepared using the cell edge passivation method provided by any of the above embodiments.
[0016] The above technical solution adopted in the embodiment of the present application may have the following advantages: In the embodiment of the present application, the sulfonic acid group-containing fluororesin contains a sulfonic acid group (-SO3H), which is highly acidic and easily dissociates into H +, -SO3H→(H+)+(-SO3), the acidic environment is conducive to the ion exchange between the sulfonic acid group-containing fluororesin and the silicon material, strengthens the in vivo passivation of the cut surface of the battery cell, facilitates the formation of a passivation layer on the cut surface of the battery, reduces the carrier recombination at the edge of the battery, increases the open circuit voltage and short circuit current of the battery, and thus improves the photoelectric conversion efficiency of the battery; moreover, the sulfonic acid group (-SO3H) forms a hydrophilic ion cluster in the fluororesin solution, while the fluorocarbon main chain forms a hydrophobic main body. This structure enables the sulfonic acid group-containing fluororesin to remain stable during the ion exchange process. The presence of hydrophobic groups (such as hydrocarbon chains) and hydrophilic groups (such as hydroxyl groups) in the fatty alcohol molecules can effectively improve the wettability of the fluororesin solution, make it better contact with the cut surface of the battery cell, and adhere to the cut surface of the battery cell, thereby improving the stability of the passivation layer. Water is a solvent in the fluororesin solution, which is used to dissolve the sulfonic acid group-containing fluororesin, increase the dispersibility and fluidity of the fluororesin solution, and help form a uniform passivation layer on the cut surface of the battery cell. In addition, using inert gas to blow dry the cut surface of the battery cell can remove any moisture or residual solvent that may be present on the cut surface while avoiding the introduction of new impurities. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.
[0018] Figure 1 It is a flow chart of the battery edge passivation method according to an embodiment of the present application. DETAILED DESCRIPTION
[0019] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. In the accompanying drawings, for clarity, the sizes of layers, regions, elements and their relative sizes may be exaggerated. Wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limitations on the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0020] like Figure 1 As shown, an embodiment of the present application provides a battery edge passivation method, comprising: S100: Slicing the entire battery to obtain battery cells; S200: contacting the cut surface of the battery cell with a fluorine-containing resin solution; wherein the fluorine-containing resin solution includes a sulfonic acid group-containing fluorine resin, a fatty alcohol and water; S300: using an inert gas to blow dry the cut surface in contact with the fluorine-containing resin solution, and forming a passivation layer on the cut surface after drying.
[0021] In the embodiment of the present application, the sulfonic acid group-containing fluororesin contains a sulfonic acid group (-SO3H), which is highly acidic and easily dissociates into H + , -SO3H→(H + ) + (-SO3), the acidic environment is conducive to the ion exchange between the sulfonic acid group-containing fluororesin and the silicon material, strengthening the in vivo passivation of the cut surface of the battery cell, facilitating the formation of a passivation layer on the cut surface of the battery, reducing the carrier recombination at the edge of the battery, and increasing the open circuit voltage and short circuit current of the battery, thereby improving the photoelectric conversion efficiency of the battery; moreover, the sulfonic acid group (-SO3H) forms a hydrophilic ion cluster in the fluororesin solution, while the fluorocarbon main chain forms a hydrophobic main body. This structure enables the sulfonic acid group-containing fluororesin to remain stable during the ion exchange process. The presence of hydrophobic groups (such as hydrocarbon chains) and hydrophilic groups (such as hydroxyl groups) in the fatty alcohol molecules can effectively improve the wettability of the fluororesin solution, making it better in contact with the cut surface of the battery cell and adhere to the cut surface of the battery cell, thereby improving the stability of the passivation layer. Water is a solvent in the fluororesin solution, which is used to dissolve the sulfonic acid group-containing fluororesin, increase the dispersibility and fluidity of the fluororesin solution, and help form a uniform passivation layer on the cut surface of the battery cell. In addition, using inert gas to blow dry the cut surface of the battery cell can remove any moisture or residual solvent that may be present on the cut surface while avoiding the introduction of new impurities.
[0022] Each step in the battery edge passivation method of the embodiment of the present application is described in detail below.
[0023] In step S100, the whole battery can be sliced by laser to obtain a plurality of battery slices (the number of battery slices is 2 or more.
[0024] It should be noted that in step S100, laser is used to slice the whole cell so that the silicon at the edge of the silicon substrate is exposed. During the laser slicing process, the cut surface of the cell must be kept clean to avoid introducing impurities on the cut surface, which may affect the subsequent attachment of the water film. The whole cell is laser cut to form a half cell (also called a half cell), or a third cell, a quarter cell, ..., an Nth cell, etc.
[0025] In step S200, the cut surface of the battery cell is immersed in a fluorine-containing resin solution, and the fluorine-containing resin forms a passivation layer on the cut surface of the battery. In some embodiments, the fluorine-containing resin solution includes: 75-80wt% of a sulfonic acid group-containing fluorine resin, 3-8wt% of a fatty alcohol, and the balance of water. The sulfonic acid group-containing fluorine resin is the main component of the fluorine-containing resin solution, and 75-80wt% of the sulfonic acid group-containing fluorine resin helps to form a dense passivation layer, reducing the electrochemical recombination and leakage phenomenon at the edge of the battery. Specifically, the amount of the sulfonic acid group-containing fluorine resin can be 75wt%, 76wt%, 77wt%, 78wt%, 79wt%, and 80wt%. Fatty alcohol is a surfactant, and water is a solvent for the sulfonic acid group-containing fluorine resin. 3-8wt% of the fatty alcohol and the balance of water can effectively adjust the wettability, dispersibility and fluidity of the fluorine-containing resin solution, which helps to form a uniform and dense passivation layer on the cut surface of the battery cell. Even in a hot and humid environment, the passivation layer has a stable passivation effect and a small DH attenuation. Specifically, the amount of fatty alcohol used can be 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, or 8wt%.
[0026] In some embodiments, the sulfonic acid group-containing fluororesin includes perfluorosulfonic acid resin. The sulfonic acid group at the end of the perfluorosulfonic acid resin chain can provide additional chemical activity, allowing the perfluorosulfonic acid resin to form a stronger chemical bond with the silicon atoms on the surface of the battery cell; in addition, the perfluorosulfonic acid resin has good adhesion and a stable fluorocarbon skeleton, which can enhance the bonding force between the passivation layer and the battery cell and improve the durability of the passivation layer. In some embodiments, the perfluorosulfonic acid resin is generated by a free radical-initiated copolymerization reaction of a perfluorovinyl ether sulfonyl fluoride comonomer and tetrafluoroethylene (TFE).
[0027] In some embodiments, the ionomer equivalent of the perfluorosulfonic acid resin is 1000-1200. When the ionomer equivalent of the perfluorosulfonic acid resin is 1000-1200, the side chain length is appropriate, so that the perfluorosulfonic acid resin has excellent chemical stability, is not easy to degrade, and improves the long-term stability of the passivation layer. Specifically, the ionomer equivalent of the perfluorosulfonic acid resin is 1000, 1100, and 1200. The molecular formula of the perfluororesin is: By adjusting the values of x, y and m, wherein x is 6-10, y is 0.1-1, and m is 1-2, the ionomer equivalent of the perfluorosulfonic acid resin is controlled to be 1000-1200.
[0028] In some embodiments, the molecular weight of the fatty alcohol is 20 or less.
[0029] It should be noted that the fatty alcohol can be a monohydric alcohol, a dihydric alcohol, or a mixture of a monohydric alcohol and a dihydric alcohol. A fatty alcohol with a smaller molecular weight is more conducive to improving the wettability of the fluorine-containing resin solution.
[0030] In some embodiments, the fatty alcohol includes one or more of methanol, ethanol, propanol, butanol, pentanol, hexanol, ethylene glycol, propylene glycol, butanediol, pentanediol, and hexanediol. These fatty alcohols have good compatibility with the sulfonic acid group-containing fluororesin and are miscible with water in any proportion, which can further improve the wettability of the fluororesin solution and improve the contact performance between the fluororesin solution and the cut surface of the battery cell.
[0031] In some embodiments, the thickness of the passivation layer is 5-20 nm. A passivation layer that is too thin may not provide sufficient protection for the edge of the battery, and a passivation layer that is too thick may affect the photoelectric conversion efficiency of the battery. The thickness of the passivation layer is controlled to be 5-20 nm, so that not only is there a passivation layer of sufficient thickness to protect the edge of the battery, but also the photoelectric performance of the battery is not affected by the passivation layer being too thick. Specifically, the thickness of the passivation layer can be 5 nm, 10 nm, 15 nm, or 20 nm.
[0032] In some embodiments, the contact time between the cut surface of the cell and the fluorine-containing resin solution is 10-60 seconds. If the contact time between the cut surface and the fluorine-containing resin solution is too short, the sulfonic acid group-containing fluorine resin cannot be fully bonded to the cut surface; if the contact time between the cut surface and the fluorine-containing resin solution is too long, it will cause waste of resources; the contact time between the cut surface and the fluorine-containing resin solution is controlled to 10-60 seconds, the sulfonic acid group-containing fluorine resin can be fully bonded to the cut surface, forming a passivation layer of a certain thickness, and avoiding waste of resources. Specifically, the contact time between the cut surface and the fluorine-containing resin solution can be 10 seconds, 20 seconds, 30 seconds, 40 seconds, 50 seconds, or 60 seconds.
[0033] In some embodiments, the inert gas in step S300 includes one or both of nitrogen and argon. Both nitrogen and argon are inert gases and will not react with the fluorine-containing resin solution or the battery cell. They are used to dry the cut surface of the battery cell and remove the residual solution and moisture, which can ensure that the formation of the passivation layer is not affected by impurities.
[0034] An embodiment of the present application provides a solar cell, which is prepared by using the cell edge passivation method provided by any of the above embodiments.
[0035] It should be noted that the battery edge passivation method of the embodiment of the present application can be applied not only to the edge passivation of rectangular battery cells, but also to the edge passivation of any irregular polygonal battery cells. For example, a square (or rectangular) battery cell with one or several chamfers does not affect the application of the battery edge passivation method in its shape. It is just that during the manufacturing process, the cut surfaces are sequentially contacted with the fluorine-containing resin solution until all the cut surfaces that need to be passivated are passivated.
[0036] The following specific embodiments further describe the present application in detail, but should not be construed as limiting the present application. Without departing from the spirit and substance of the present application, modifications or replacements made to the structure of the present application are within the scope of the present application.
[0037] Example 1 Embodiment 1 provides a solar cell, wherein the edge passivation method of the solar cell comprises: S100a: Slicing the entire battery to obtain battery cells; S200a: contacting the cut surface of the cell with a fluorine-containing resin solution for 30 seconds; wherein the fluorine-containing resin solution comprises 75 wt % of perfluorosulfonic acid resin, 5 wt % of fatty alcohol (methanol) and 20 wt % of water; S300a: The cut surface in contact with the fluorine-containing resin solution is blown dry using an inert gas (nitrogen) to form a passivation layer with a thickness of 10 nm on the cut surface.
[0038] Example 2 The edge passivation method of the solar cell in Example 2 is similar to the edge passivation method of the solar cell in Example 1, except that step S200a and step S300a are different. In Example 2, S200a is: contacting the cut surface of the cell with a fluorine-containing resin solution for 10 seconds; wherein the fluorine-containing resin solution comprises 78 wt % of perfluorosulfonic acid resin, 8 wt % of aliphatic alcohol (propanol) and 14 wt % of water; S300a is: using an inert gas (argon gas) to blow dry the cut surface in contact with the fluorine-containing resin solution, and forming a passivation layer with a thickness of 15 nm on the cut surface.
[0039] Example 3 The edge passivation method of the solar cell in Example 3 is similar to the edge passivation method of the solar cell in Example 1, except that step S200a and step S300a are different. In Example 3, S200a is: contacting the cut surface of the cell with a fluorine-containing resin solution for 50 seconds; wherein the fluorine-containing resin solution comprises 80 wt % of perfluorosulfonic acid resin, 5 wt % of fatty alcohol (butanediol and hexanol, volume ratio of 1:1) and 15 wt % of water; S300a is: using an inert gas (argon gas) to blow dry the cut surface in contact with the fluorine-containing resin solution, thereby forming a passivation layer with a thickness of 12 nm on the cut surface.
[0040] Example 4 The edge passivation method of the solar cell of Example 4 is similar to the edge passivation method of the solar cell of Example 1, except that step S200a and step S300a are different. In Example 4, S200a is: contacting the cut surface of the battery cell with a fluorine-containing resin solution for 60 seconds; wherein the fluorine-containing resin solution comprises 79wt% of perfluorosulfonic acid resin, 3wt% of fatty alcohol (ethanol and hexanediol, volume ratio of 1:1) and 18wt% of water; S300a is: using an inert gas (nitrogen) to blow dry the cut surface in contact with the fluorine-containing resin solution, thereby forming a passivation layer with a thickness of 20 nm on the cut surface.
[0041] Example 5 The edge passivation method of the solar cell of Example 5 is similar to the edge passivation method of the solar cell of Example 1, except that step S200a and step S300a are different. In Example 5, S200a is: contacting the cut surface of the cell with a fluorine-containing resin solution for 40 seconds; wherein the fluorine-containing resin solution comprises 76 wt % of perfluorosulfonic acid resin, 7 wt % of fatty alcohol (butanol) and 17 wt % of water; S300a is: using an inert gas (argon gas) to blow dry the cut surface in contact with the fluorine-containing resin solution, thereby forming a passivation layer with a thickness of 10 nm on the cut surface.
[0042] Example 6 The edge passivation method of the solar cell in Example 6 is similar to the edge passivation method of the solar cell in Example 1, except that step S200a and step S300a are different. In Example 6, S200a is: contacting the cut surface of the battery cell with a fluorine-containing resin solution for 30 seconds; wherein the fluorine-containing resin solution comprises 77 wt % of perfluorosulfonic acid resin, 4 wt % of fatty alcohol (pentylene glycol) and 19 wt % of water; S300a is: using an inert gas (nitrogen) to blow dry the cut surface in contact with the fluorine-containing resin solution, and forming a passivation layer with a thickness of 5 nm on the cut surface.
[0043] In order to more clearly illustrate the technical effects of the embodiments of the present application, the present application uses a solar cell without edge passivation as comparative example 1. The present application prepares the solar cells of embodiments 1 to 6 and comparative example 1 into corresponding photovoltaic modules, and tests the open circuit voltage Voc, short circuit current density Jsc, fill factor FF, and conversion efficiency n of the corresponding photovoltaic modules, wherein the performance of comparative example 1 is used as the standard to calculate the difference of the corresponding performance of embodiments 1 to 6 (i.e., △n=conversion efficiency of the embodiment-conversion efficiency of comparative example 1, △Voc=open circuit voltage of the embodiment-open circuit voltage of comparative example 1, △Jsc=short circuit current density of the embodiment-short circuit current density of comparative example 1, △FF=fill factor of the embodiment-fill factor of comparative example 1), and the test results are shown in Table 1.
[0044] Table 1
[0045] It can be seen from the data in Table 1 that, compared with the solar cell of Comparative Example 1, the open circuit voltage, short circuit current density, fill factor and conversion efficiency of the solar cells of Examples 1 to 6 of the present application are significantly improved.
[0046] In summary, in the present embodiment, the sulfonic acid group-containing fluororesin contains a sulfonic acid group (-SO3H), which is highly acidic and easily dissociates into H + , -SO3H→(H + ) + (-SO3), the acidic environment is conducive to the ion exchange between the sulfonic acid group-containing fluororesin and the silicon material, strengthening the in vivo passivation of the cut surface of the battery cell, facilitating the formation of a passivation layer on the cut surface of the battery, reducing the carrier recombination at the edge of the battery, and increasing the open circuit voltage and short circuit current of the battery, thereby improving the photoelectric conversion efficiency of the battery; moreover, the sulfonic acid group (-SO3H) forms a hydrophilic ion cluster in the fluororesin solution, while the fluorocarbon main chain forms a hydrophobic main body. This structure enables the sulfonic acid group-containing fluororesin to remain stable during the ion exchange process. The presence of hydrophobic groups (such as hydrocarbon chains) and hydrophilic groups (such as hydroxyl groups) in the fatty alcohol molecules can effectively improve the wettability of the fluororesin solution, making it better in contact with the cut surface of the battery cell and adhere to the cut surface of the battery cell, thereby improving the stability of the passivation layer. Water is a solvent in the fluororesin solution, which is used to dissolve the sulfonic acid group-containing fluororesin, increase the dispersibility and fluidity of the fluororesin solution, and help form a uniform passivation layer on the cut surface of the battery cell. In addition, using inert gas to blow dry the cut surface of the battery cell can remove any moisture or residual solvent that may be present on the cut surface while avoiding the introduction of new impurities.
[0047] It should be noted that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The orientation words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.
[0048] It should be noted that the terms "first", "second", "front", "back", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0049] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this application refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.
[0050] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0051] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A battery edge passivation method, characterized in that: include: Slice the whole battery to obtain battery cells; The cut surface of the cell sheet is contacted with a fluorine-containing resin solution; wherein the fluorine-containing resin solution comprises a sulfonic acid group-containing fluorine resin, a fatty alcohol and water; The cut surface in contact with the fluorine-containing resin solution is blown dry using an inert gas, and a passivation layer is formed on the cut surface after being blown dry.
2. The battery edge passivation method according to claim 1, characterized in that: The fluorine-containing resin solution comprises: 75-80 wt % of sulfonic acid group-containing fluorine resin, 3-8 wt % of fatty alcohol, and the balance of water.
3. The battery edge passivation method according to claim 1, characterized in that: The sulfonic acid group-containing fluorine resin includes a perfluorosulfonic acid resin.
4. The battery edge passivation method according to claim 3, characterized in that: The ionomer equivalent of the perfluorosulfonic acid resin is 1000-1200.
5. The battery edge passivation method according to claim 1, characterized in that: The molecular weight of the fatty alcohol is less than or equal to 200.
6. The battery edge passivation method according to claim 1, characterized in that: The fatty alcohol includes one or more of methanol, ethanol, propanol, butanol, pentanol, hexanol, ethylene glycol, propylene glycol, butanediol, pentanediol, and hexanediol.
7. The battery edge passivation method according to any one of claims 1 to 6, characterized in that: The thickness of the passivation layer is 5-20 nm.
8. The battery edge passivation method according to any one of claims 1 to 6, characterized in that: The contact time between the cut surface of the cell and the fluorine-containing resin solution is 10-60 seconds.
9. The battery edge passivation method according to any one of claims 1 to 6, characterized in that: The inert gas includes one or both of nitrogen and argon.
10. A solar cell, characterized in that: The battery is prepared by the battery edge passivation method according to any one of claims 1 to 9.
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