A method for manufacturing a photovoltaic module and a photovoltaic module

Abstract

The application relates to a preparation method of a photovoltaic module and the photovoltaic module, which comprises the following steps: providing a back contact solar cell piece, printing insulating glue on the back light surface of the back contact solar cell piece, performing light curing treatment on the insulating glue, the light curing treatment time T1 satisfies 1s <= T1 <= 3s, performing heat curing treatment on the insulating glue, and the heat curing treatment time T2 satisfies 15s <= T2 <= 35s. The double curing process combining light curing and heat curing is adopted for the insulating glue on the back light surface of the back contact solar cell piece, the insulating glue curing time is shortened, the insulating glue curing efficiency is improved, the production efficiency of the photovoltaic module is improved, meanwhile, the adhesive property of the insulating glue is improved, the adhesion between the insulating glue and the back contact solar cell piece is enhanced, the stability and reliability of the back contact solar cell piece are improved, the high-temperature resistance of the insulating glue is improved, the insulating effect of the insulating glue under the influence of high temperature is reduced, and the possibility of short circuit of the back contact solar cell piece is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar energy, in particular to a preparation method of a photovoltaic module and the photovoltaic module. BACKGROUND

[0002] The back contact solar cell can convert sunlight into electric energy, and the back surface of the back contact solar cell is usually provided with insulating glue. At present, the curing efficiency of the insulating glue is low, and the performance of the insulating glue is poor, which affects the quality and capacity of the photovoltaic module. SUMMARY

[0003] Therefore, the present application provides a preparation method of a photovoltaic module and the photovoltaic module, so as to solve the problem of low curing efficiency of the insulating glue in the prior art, and improve the performance of the insulating glue.

[0004] In a first aspect, the present application provides a preparation method of a photovoltaic module, comprising: providing a back contact solar cell; printing insulating glue on the back surface of the back contact solar cell; performing light curing treatment on the insulating glue, wherein the time T1 of the light curing treatment satisfies 1s≤T1≤3s; and performing heat curing treatment on the insulating glue, wherein the time T2 of the heat curing treatment satisfies 15s≤T2≤35s.

[0005] In a possible implementation, the curing device comprises a light curing mechanism, the light curing mechanism has at least three ultraviolet light sources arranged along a first direction, and the power P of each ultraviolet light source satisfies 1050mW / cm2≤P≤1500mW / cm2. The light curing treatment on the insulating glue comprises: placing the back contact solar cell in the light curing mechanism, turning on each ultraviolet light source, and moving the back contact solar cell along the first direction, so that each ultraviolet light source performs light curing on the insulating glue.

[0006] In a possible implementation, the light curing mechanism has three ultraviolet light sources arranged along the first direction, and the time t1 of each ultraviolet light source performing light curing on the insulating glue satisfies 0.5s≤t1≤1s.

[0007] In a possible implementation, the light curing mechanism has four ultraviolet light sources arranged along the first direction, and the time t2 of each ultraviolet light source performing light curing on the insulating glue satisfies 0.4s≤t2≤0.75s.

[0008] In a possible implementation, when the heat curing treatment is performed on the insulating glue, the temperature A of the heat curing treatment satisfies 150℃≤A≤200℃.

[0009] In a possible implementation, the curing device comprises a thermal curing mechanism, the thermal curing mechanism comprises a thermal curing area and a cooling area, the thermal curing of the insulation glue comprises placing the back contact solar cell piece in the thermal curing area for thermal curing, after the thermal curing of the insulation glue, the method for manufacturing the photovoltaic module comprises: placing the back contact solar cell piece in the cooling area for cooling until the temperature of the back contact solar cell piece is less than or equal to 60 ℃.

[0010] In a possible implementation, the photocuring mechanism and the thermal curing mechanism are arranged along the first direction, the thermal curing area and the cooling area are arranged along the first direction, and the curing device further comprises a conveying mechanism. The method for manufacturing the photovoltaic module comprises: driving the conveying mechanism to move the back contact solar cell piece along the first direction in the curing device.

[0011] In a possible implementation, after the thermal curing of the insulation glue, the method for manufacturing the photovoltaic module comprises: detecting the back contact solar cell piece; and series welding the back contact solar cell piece detected to form a cell string.

[0012] In a possible implementation, the insulation glue at least comprises a photoinitiator and a thermal initiator, the photoinitiator is at least one of photoinitiator 819, photoinitiator 907, photoinitiator 651, and photoinitiator 127, and the thermal initiator is at least one of peroxide dicarbonate, peroxide lauryl, and peroxide dimethylbenzoyl.

[0013] In a second aspect, a photovoltaic module is manufactured by the method for manufacturing the photovoltaic module in any one of the above, wherein the photovoltaic module comprises a cover plate, an encapsulation layer, and at least one cell string, the encapsulation layer is between the cover plate and the cell string, the cover plate is connected with the cell string through the encapsulation layer, and the cell string comprises a plurality of back contact solar cell pieces electrically connected with each other.

[0014] The embodiment of the present application provides a preparation method of a photovoltaic module and the photovoltaic module, and the preparation method comprises the following steps: providing a back contact solar cell, printing insulating glue on the back light surface of the back contact solar cell, performing light curing treatment on the insulating glue, the light curing treatment time T1 satisfies 1s<=T1<=3s, performing heat curing treatment on the insulating glue, and the heat curing treatment time T2 satisfies 15s<=T2<=35s. The double curing process of light curing and heat curing is used for the insulating glue on the back light surface of the back contact solar cell, so that the insulating glue curing time can be shortened, the insulating glue curing efficiency is improved, the production efficiency of the photovoltaic module is improved, and then the production capacity of the photovoltaic module is improved. The double curing process can improve the adhesion of the insulating glue, enhance the adhesion of the insulating glue and the back contact solar cell, so that the insulating glue can be better combined with the back contact solar cell, the stability and reliability of the back contact solar cell are improved, the performance of the photovoltaic module is ensured, meanwhile, the high-temperature resistance of the insulating glue is improved, so that the insulating effect of the insulating glue under the influence of high temperature is reduced or even fails, the possibility of short circuit of the back contact solar cell is reduced, and the stability and reliability of the back contact solar cell are improved.

[0015] It should be understood that the foregoing general description and the following detailed description are only examples and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 A flow chart of a preparation method of a photovoltaic module is provided for an embodiment of the present application.

[0018] Figure 2 A schematic diagram of a back contact solar cell is provided for an embodiment of the present application.

[0019] Figure 3 A schematic diagram of a curing device is provided for an embodiment of the present application.

[0020] Figure 4 A schematic diagram of a photovoltaic module is provided for an embodiment of the present application.

[0021] REFERENCE SIGNS:

[0022] 1-back contact solar cell; 11-insulating glue; 12-positive main grid; 13-negative main grid; 14-positive fine grid; 15-negative fine grid;

[0023] 100 - Curing equipment; 101 - Photocuring mechanism; 1011 - Ultraviolet light source; 102 - Thermal curing mechanism; 103 - Transmission mechanism;

[0024] 200 - Photovoltaic module; 201 - Battery string; 202 - First cover plate; 203 - First encapsulation layer; 204 - Second encapsulation layer; 205 - Second cover plate. Detailed Implementation

[0025] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0027] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0029] like Figure 1 As shown in the embodiment of this application, a method for manufacturing a photovoltaic module is provided, including:

[0030] Step S1: Provide a back-contact solar cell. The back-contact solar cell has a light-receiving surface and a back-contact surface along its thickness direction. The light-receiving surface is the surface that can be directly illuminated by sunlight, while the back-contact surface is the surface that is not directly illuminated by sunlight. The back-contact solar cell places all the grid lines (i.e., metal electrodes) on the back-contact surface, ensuring that the light-receiving surface is unobstructed by the grid lines. This reduces the shading area of ​​the light-receiving surface, eliminates the current loss due to grid line shading, maximizes the utilization of incident photons, and thus improves the photoelectric conversion efficiency of the back-contact solar cell.

[0031] After step S1, step S2 is entered: printing insulating glue on the back light surface of the back contact solar cell piece. Since the positive and negative electrode grid lines of the back contact solar cell are arranged on the back light surface, it is necessary to print insulating glue on the back light surface to insulate the grid lines of different polarities and avoid short circuit of the back contact solar cell piece.

[0032] As shown in FIG. 1, in some embodiments, the back light surface of the back contact solar cell piece 1 can be provided with intersecting main grid and fine grid, the fine grid is used to collect and conduct the current generated by the back contact solar cell piece 1, the main grid can collect the current on the fine grid to converge and facilitate the transmission of the current to the outside of the back contact solar cell piece. The main grid can include positive main grid 12 and negative main grid 13, and the fine grid can include positive fine grid 14 and negative fine grid 15, the positive main grid 12 is connected with the positive fine grid 14, and the negative main grid 13 is connected with the negative fine grid 15. Figure 2 The above step S2 specifically includes: arranging the insulating glue 11 between the positive main grid 12 and the negative fine grid 15 and between the negative main grid 13 and the positive fine grid 14. The insulating glue 11 can insulate and isolate the main grid and the fine grid with opposite polarity to avoid short circuit of the back contact solar cell piece 1 and facilitate to improve the reliability of the photovoltaic module.

[0033] After step S2, step S3 is entered: performing light curing treatment on the insulating glue, and the light curing treatment time T1 satisfies: 1s≤T1≤3s. The insulating glue includes a photoinitiator, so that the insulating glue can be cured under light conditions. The light curing treatment time described above can be understood as the time for which the light source irradiates the insulating glue to cure it. The light curing treatment time T1 can be 1s, 1.1s, 1.2s, 1.3s, 1.4s, 1.5s, 1.6s, 1.7s, 1.8s, 1.9s, 2s, 2.1s, 2.2s, 2.3s, 2.4s, 2.5s, 2.6s, 2.7s, 2.8s, 2.9s or 3s. Of course, it can also be other values within the above range.

[0034] If the light curing treatment time is too short, it will affect the light curing effect and thus the performance of the insulating glue. If the light curing treatment time is too long, it will lead to a decrease in the efficiency of the insulating glue curing link and affect the production efficiency of the photovoltaic module. Therefore, by limiting the light curing treatment time within the above range, the light curing effect is ensured while the light curing efficiency is improved, thereby improving the production efficiency of the photovoltaic module.

[0035]

[0036] ​The insulation glue can be quickly converted from liquid state to solid state by the photocuring treatment, and the insulation glue after the photocuring treatment has high curing degree and almost cannot flow, that is, the insulation glue after the photocuring treatment can achieve high curing degree in a short time, thereby improving the curing efficiency of the insulation glue. The photocuring treatment can be performed at room temperature without using other materials such as chemical reagents, thereby simplifying the production process of the photovoltaic module.

[0037] After step S3, step S4 is entered: the insulation glue is subjected to thermal curing treatment, and the thermal curing treatment time T2 satisfies: 15s≤T2≤35s. The insulation glue can also include a thermal initiator, so that the insulation glue can be cured at high temperature. The thermal curing treatment time can be understood as the curing time of the insulation glue at high temperature, and the thermal curing treatment time T2 can be 15s, 16s, 17s, 18s, 19s, 20s, 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, 30s, 31s, 32s, 33s, 34s or 35s, and can also be other values within the above range.

[0038] If the thermal curing treatment time is short, the thermal curing effect is easily affected, thereby affecting the performance of the insulation glue. If the thermal curing treatment time is long, the efficiency of the insulation glue curing link is reduced, thereby affecting the production efficiency of the photovoltaic module. Therefore, by limiting the thermal curing treatment time within the above range, the thermal curing effect is ensured while the thermal curing efficiency is improved, thereby improving the production efficiency of the photovoltaic module.

[0039] The insulation glue is completely cured by the thermal curing treatment after the photocuring treatment, and at the same time, the insulation glue has excellent comprehensive performance, thereby improving the reliability of the insulation glue and ensuring the performance of the back contact solar cell piece.

[0040] This application employs a dual curing process combining photocuring and thermal curing for the insulating adhesive on the back surface of the back contact solar cell. This shortens the curing time and improves the curing efficiency of the insulating adhesive, thereby increasing the production efficiency of photovoltaic modules and ultimately boosting their production capacity. The aforementioned dual curing process enhances the adhesive's bonding performance and strengthens its adhesion to the back contact solar cell, allowing for better bonding and improving the stability and reliability of the back contact solar cell. This ensures the performance of the photovoltaic module. Simultaneously, the dual curing process also imparts excellent weather resistance to the insulating adhesive. Specifically, it improves the high-temperature resistance of the insulating adhesive, reducing the likelihood of insulation degradation or even failure under high temperatures, which could lead to short circuits in the back contact solar cell. This further enhances the stability and reliability of the back contact solar cell.

[0041] In one possible implementation, the insulating adhesive includes at least a photoinitiator and a thermal initiator. The photoinitiator is at least one selected from photoinitiator 819, photoinitiator 907, photoinitiator 651, and photoinitiator 127. The thermal initiator is at least one selected from dicarbonic acid peroxide, lauroyl peroxide, and benzoyl peroxide. The functions of the photoinitiator and thermal initiator have been described above and will not be repeated here. By using the aforementioned photoinitiator and thermal initiator, the insulating adhesive can achieve both photocuring and thermal curing, thereby improving the curing efficiency of the insulating adhesive and thus increasing the production efficiency of photovoltaic modules. Simultaneously, it also improves the overall performance of the insulating adhesive, enabling it to provide stable and reliable insulation on the back-contact solar cells and preventing short circuits in the back-contact solar cells.

[0042] The insulating adhesive may also include inorganic fillers. Specifically, the inorganic filler may be colorless fumed silica. Fumed silica can improve the high temperature resistance of the insulating adhesive, thereby ensuring that the insulating adhesive has a reliable insulating effect.

[0043] In some embodiments, the insulating adhesive may also be colorless. Colorless insulating adhesive can improve the aesthetics of photovoltaic modules, thereby expanding the application range of photovoltaic modules to meet the needs of different application scenarios.

[0044] like Figure 3 As shown, in one possible implementation, the curing device 100 includes a light curing mechanism 101, which can use ultraviolet light to cure the insulating adhesive. The light curing mechanism 101 has at least three ultraviolet light sources 1011 arranged along a first direction X, and the ultraviolet light sources 1011 can be ultraviolet lamp beads.

[0045] The light curing process for insulating adhesives includes:

[0046] Step S31: Place the back contact solar cell in the light curing mechanism 101.

[0047] After step S31, enter step S32: Turn on the ultraviolet light sources 1011, and move the back contact solar cell along the first direction X, so that the ultraviolet light sources 1011 can perform light curing on the insulating glue.

[0048] By arranging multiple ultraviolet light sources 1011, the irradiation area of the ultraviolet light can be increased, and the light curing efficiency can be improved, thereby facilitating the improvement of the production capacity of the photovoltaic module. During the light curing process, the back contact solar cell can be moved along the direction in which the ultraviolet light sources 1011 are arranged, so that the back contact solar cell can be irradiated by multiple ultraviolet light sources 1011, thereby improving the light curing effect.

[0049] The power P of a single ultraviolet light source 1011 satisfies: 1050 mW / cm 2 ≤P≤1500 mW / cm 2 , for example, P can be 1050 mW / cm 2 , 1100 mW / cm 2 , 1150 mW / cm 2 , 1200 mW / cm 2 , 1250 mW / cm 2 , 1300 mW / cm 2 , 1350 mW / cm 2 , 1400 mW / cm 2 , 1450 mW / cm 2 or 1500 mW / cm 2 , of course, other values within the above range can also be used. The power of the three ultraviolet light sources 1011 can be consistent. If the power of a single ultraviolet light source 1011 is too low, the light curing time needs to be extended to ensure the light curing effect, which reduces the light curing efficiency of the insulating glue, thereby affecting the production efficiency of the photovoltaic module. If the power of a single ultraviolet light source 1011 is too high, the energy consumption of the light curing mechanism 101 is too large, which increases the production cost of the photovoltaic module. By limiting the power of the ultraviolet light source 1011, the light curing time can be shortened while ensuring the light curing effect, thereby improving the curing efficiency of the insulating glue, which is conducive to improving the production efficiency of the photovoltaic module and reducing the production cost of the photovoltaic module.

[0050] In one possible implementation, the photocuring mechanism has three ultraviolet light sources arranged along a first direction. The time t1 for each ultraviolet light source to photocur the insulating adhesive satisfies the condition: 0.5s ≤ t1 ≤ 1s. For example, t1 can be 0.5s, 0.55s, 0.6s, 0.65s, 0.7s, 0.75s, 0.8s, 0.85s, 0.9s, 0.95s, or 1s, or any specific value within the aforementioned range. The photocuring time for the insulating adhesive by the three ultraviolet light sources can be the same. By limiting the photocuring time of a single ultraviolet light source, the photocuring efficiency can be improved while ensuring the photocuring effect, thereby contributing to increased production efficiency of photovoltaic modules.

[0051] In some embodiments, the photocuring mechanism has three ultraviolet light sources arranged along a first direction, each of which has a power of 1050 mW / cm². 2 Each ultraviolet light source can cure the insulating adhesive for 0.64 seconds.

[0052] In some embodiments, the photocuring mechanism has three ultraviolet light sources arranged along a first direction, each of which has a power of 1200 mW / cm². 2 Each ultraviolet light source can cure the insulating adhesive for 0.56 seconds.

[0053] The curing time of the insulating adhesive by the ultraviolet light source can be reduced by appropriately increasing the power of the ultraviolet light source, thereby further shortening the curing time of the insulating adhesive and improving the production efficiency of photovoltaic modules.

[0054] like Figure 3 As shown, in one possible implementation, the photocuring mechanism 101 has four ultraviolet light sources 1011 arranged along the first direction X. The time t2 for a single ultraviolet light source 1011 to photocur the insulating adhesive satisfies: 0.4s ≤ t2 ≤ 0.75s. For example, t2 can be 0.4s, 0.42s, 0.46s, 0.48s, 0.5s, 0.52s, 0.55s, 0.6s, 0.65s, 0.7s, 0.72s, or 0.75s, or other values ​​within the above range. The photocuring time for the four ultraviolet light sources 1011 to the insulating adhesive can be the same. By limiting the photocuring time of a single ultraviolet light source 1011 to the insulating adhesive, the photocuring efficiency can be improved while ensuring the photocuring effect, thereby improving the production efficiency of photovoltaic modules.

[0055] In some embodiments, the photocuring mechanism has four ultraviolet light sources arranged along a first direction, each of which has a power of 1050 mW / cm².2 The time for each UV light source to perform the photo-curing process on the insulation glue can be 0.48s.

[0056] In some embodiments, the photo-curing mechanism has four UV light sources arranged along the first direction, and the power of each UV light source can be 1200mW / cm 2 The time for each UV light source to perform the photo-curing process on the insulation glue can be 0.42s.

[0057] The number of UV light sources, the power of each UV light source, and the time for each UV light source to perform the photo-curing process on the insulation glue can be adjusted according to the actual production needs of the photovoltaic module, so as to improve the production efficiency of the photovoltaic module and achieve the best production capacity of the photovoltaic module.

[0058] In a possible implementation, when the insulation glue is subjected to the heat-curing process, the temperature A of the heat-curing process satisfies: 150℃≤A≤200℃. For example, the temperature A can be 150℃, 155℃, 160℃, 165℃, 170℃, 175℃, 180℃, 185℃, 190℃, 195℃, or 200℃, and of course can also be other values within the above range. By designing the temperature of the heat-curing process to be 150° to 200℃, the heat-curing effect of the insulation glue can be ensured, the performance of the insulation glue can be improved, the insulation glue can play a reliable isolation role on the back surface of the back contact solar cell sheet, and the curing efficiency of the insulation glue can be ensured, so as to facilitate the production process of the photovoltaic module.

[0059] As shown in FIG. 1, in a possible implementation, the curing device 100 includes a heat-curing mechanism 102, and the heat-curing mechanism 102 includes a heat-curing area (not shown in the figure) and a cooling area (not shown in the figure). Figure 3

[0060] The heat-curing process on the insulation glue includes placing the back contact solar cell sheet in the heat-curing area to perform the heat-curing process. In some embodiments, the heat-curing process on the insulation glue can be performed by means of heat cycle blowing.

[0061] After the heat-curing process on the insulation glue, the method for manufacturing the photovoltaic module includes:

[0062] ​Step S5: placing the back contact solar cell in a cooling area for cooling treatment until the temperature of the back contact solar cell is less than or equal to 60℃. The heat curing treatment described above can increase the temperature of the back contact solar cell. In order to ensure that the back contact solar cell can smoothly enter the next production link, the back contact solar cell can be cooled by air cooling and / or water cooling, so as to facilitate the production process of the photovoltaic module. At the same time, the heat-cured insulating glue is cooled, which is beneficial to reduce the internal stress generated by the insulating glue in the heat curing process and improve the bonding performance of the insulating glue, thereby improving the reliability of the insulating glue and making it better combined with the back contact solar cell.

[0063] As shown in Figure 3 In a possible implementation, the method for manufacturing the photovoltaic module includes: driving the back contact solar cell to move in the curing device 100 along the first direction X by the transmission mechanism 103.

[0064] Specifically, the curing device 100 can extend along the first direction X, which can be regarded as the length direction of the curing device 100. As described above, the curing device 100 includes the light curing mechanism 101 and the heat curing mechanism 102, and the light curing mechanism 101 and the heat curing mechanism 102 are arranged along the first direction X. The curing device 100 can further include the transmission mechanism 103, which can have a conveying belt. The conveying belt can drive the back contact solar cell to move along the first direction X, so that the back contact solar cell sequentially passes through the light curing mechanism 101 and the heat curing mechanism 102, so as to facilitate the light curing and heat curing of the insulating glue.

[0065] Inside the heat curing mechanism 102, the heat curing area and the cooling area can be arranged along the first direction X, and the back contact solar cell can be transmitted in each area inside the heat curing mechanism 102 under the driving of the transmission mechanism 103.

[0066] As described above, in the light curing mechanism 101, the plurality of ultraviolet light sources 1011 can be arranged along the first direction X. The movement of the back contact solar cell in the light curing mechanism 101 is realized by the transmission mechanism 103, so that the back contact solar cell can be irradiated by the plurality of ultraviolet light sources 1011, thereby improving the light curing effect.

[0067] As can be seen, by arranging the transmission mechanism 103, the back contact solar cell can move inside the light curing mechanism 101, inside the heat curing mechanism 102, and between the light curing mechanism 101 and the heat curing mechanism 102, without the need for manual handling of the back contact solar cell, which is conducive to improving the curing efficiency of the insulation glue, thereby improving the production efficiency of the photovoltaic module. That is, part of the structure of the transmission mechanism 103 is located in the light curing mechanism 101, part of the structure is located in the heat curing mechanism 102, and part of the structure is located between the light curing mechanism 101 and the heat curing mechanism 102. The moving speed of the transmission mechanism 103 can be set according to the actual production needs of the photovoltaic module to ensure the smooth transportation of the back contact solar cell in the curing equipment 100.

[0068] In one possible implementation, after the heat curing treatment of the insulation glue, the method for manufacturing the photovoltaic module comprises:

[0069] Step S6: detecting the back contact solar cell. As mentioned above, after the heat curing treatment of the insulation glue, the entire back contact solar cell can be cooled to reduce the temperature to a preset range, and then the back contact solar cell can be detected.

[0070] In some embodiments, the detection of the back contact solar cell can be performed by automatic optical inspection (AOI). The AOI detection can detect defects, foreign matter, fingerprints, etc. on the back contact solar cell to improve the quality of the photovoltaic module. At the same time, by using AOI detection instead of manual inspection, the detection efficiency and accuracy of the detection results can be improved.

[0071] Step S7: string welding the back contact solar cell detected to form a cell string. Specifically, a plurality of back contact solar cells can be arranged in a predetermined direction, wherein two adjacent back contact solar cells can be mechanically and electrically connected by a welding strip, the welding strip can be connected with the main grid on the back contact solar cell, and the number of welding strips can correspond to the number of main grids.

[0072] After step S6 and before step S7, a gray glue can also be printed on a predetermined position of the back light surface of the back contact solar cell. The gray glue can play a role in electrical connection between the welding strip and the main grid of the back contact solar cell to improve the reliability of the photovoltaic module.

[0073] After the battery string is obtained, a plurality of battery strings can be connected in series or in parallel through bus bars to form a battery assembly, and then a front encapsulation structure and a back encapsulation structure can be provided, the front encapsulation structure is arranged on the light-receiving surface of the battery assembly (i.e. the light-receiving surface of the back contact solar cell sheet), and the back encapsulation structure is arranged on the back light surface of the battery assembly (i.e. the back light surface of the back contact solar cell sheet), and then the front encapsulation structure, the battery assembly and the back encapsulation structure are laminated to form a laminated piece.

[0074] The front encapsulation structure described above includes a first cover plate and a first encapsulation layer, and the first cover plate can be a glass cover plate with high light transmittance. The material of the first encapsulation layer can be one or more of ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE) and polyvinyl butyral (PVB). The back encapsulation structure described above includes a second cover plate and a second encapsulation layer, and the material of the second cover plate can be glass, or the second cover plate can also be composed of a plurality of polymer film layers. The material of the second encapsulation layer can be one or more of the above-mentioned EVA, POE and PVB. The front encapsulation structure and the back encapsulation structure can ensure that the battery assembly has good mechanical strength, reduce the impact of hail impact, wind blowing, mechanical vibration and the like, and also improve the sealing performance of the battery assembly, and improve the corrosion resistance and safety of the battery assembly.

[0075] After the laminated piece is obtained, a frame connection and a junction box can be installed on the laminated piece to form a photovoltaic module. The frame is beneficial to improve the mechanical strength of the photovoltaic module to ensure the reliability of the photovoltaic module. The junction box can realize electrical connection between the photovoltaic module and external equipment or between the photovoltaic modules.

[0076] As shown in Figure 4 The embodiment of the present application provides a photovoltaic module 200 prepared by the preparation method of the photovoltaic module 200 in any one of the above. The photovoltaic module 200 includes a cover plate, an encapsulation layer and at least one battery string 201, the encapsulation layer is located between the cover plate and the battery string 201, the cover plate is connected with the battery string 201 through the encapsulation layer, and the battery string 201 includes a plurality of back contact solar cell sheets 1 electrically connected with each other.

[0077] The cover plate can include a first cover plate 202 and a second cover plate 205. The first cover plate 202 can be located at an upper layer of the photovoltaic module 200, and the second cover plate 205 can be located at a lower layer of the photovoltaic module 200. The encapsulation layer includes a first encapsulation layer 203 and a second encapsulation layer 204. The first encapsulation layer 203 can be located between the first cover plate 202 and the battery string 201, and the first encapsulation layer 203 is used to bond the first cover plate 202 and the battery string 201 together. The second encapsulation layer 204 can be located between the second cover plate 205 and the battery string 201, and the second encapsulation layer 204 is used to connect the battery string 201 and the second cover plate 205 together. The first cover plate 202, the first encapsulation layer 203, the battery string 201, the second encapsulation layer 204, and the second cover plate 205 can be arranged along the thickness direction of the photovoltaic module 200 and laminated together.

[0078] The materials of the first cover plate 202, the second cover plate 205, the first encapsulation layer 203, and the second encapsulation layer 204 have been introduced above, and will not be repeated here.

[0079] The above only represents the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of making a photovoltaic module, characterized by, The application relates to a preparation method of a photovoltaic module. The preparation method comprises the following steps: providing a back contact solar cell; The insulating glue is subjected to a light curing treatment, a time T1 of the light curing treatment satisfies: 1s≤T1≤3s, and the light curing treatment adopts an ultraviolet light source with a power P satisfying: 1050mW / cm 2 ≤P≤1500mW / cm 2 ​ printing insulating glue on the back of the back contact solar cell; 2. The method of claim 1, wherein the method further comprises: performing heat curing treatment on the insulating glue, wherein the heat curing treatment time T2 satisfies 15s<=T2<=35s, and the heat curing treatment temperature A satisfies 150 DEG C<=A<=200 DEG C. The curing device comprises a light curing mechanism, wherein the light curing mechanism comprises at least three ultraviolet light sources arranged along a first direction, the light curing mechanism comprises: placing the back contact solar cell in the light curing mechanism; 3. The method of claim 2, wherein the step of applying the encapsulant is performed after the step of applying the backsheet. turning on the ultraviolet light sources, and moving the back contact solar cell along the first direction so that the ultraviolet light sources perform light curing treatment on the insulating glue. The light curing mechanism comprises three ultraviolet light sources arranged along the first direction; 4. The method of claim 3, wherein the step of applying the encapsulant is performed after the step of applying the backsheet. the light curing treatment time t1 of a single ultraviolet light source on the insulating glue satisfies 0.5s<=t1<=1s. The light curing mechanism comprises four ultraviolet light sources arranged along the first direction; 5. The method of claim 2, wherein the step of applying the encapsulant is performed by a method selected from the group consisting of: extrusion, injection molding, and transfer molding. the light curing treatment time t2 of a single ultraviolet light source on the insulating glue satisfies 0.4s<=t2<=0.75s. The curing device comprises a heat curing mechanism, wherein the heat curing mechanism comprises a heat curing area and a cooling area; the heat curing mechanism comprises: placing the back contact solar cell in the heat curing area to perform heat curing treatment; after the heat curing treatment on the insulating glue, the preparation method of the photovoltaic module comprises:

6. The method of claim 5, wherein the step of applying the encapsulant is performed after the step of applying the backsheet. placing the back contact solar cell in the cooling area to perform cooling treatment until the temperature of the back contact solar cell is less than or equal to 60 DEG C. The light curing mechanism and the heat curing mechanism are arranged along the first direction, the heat curing area and the cooling area are arranged along the first direction, and the curing device further comprises a conveying mechanism; the preparation method of the photovoltaic module comprises:

7. The method of producing a photovoltaic module according to any one of claims 1 to 6, characterized in that, driving the conveying mechanism to move the back contact solar cell along the first direction in the curing device. after the heat curing treatment on the insulating glue, the preparation method of the photovoltaic module comprises: detecting the back contact solar cell; 8. The method of producing a photovoltaic module according to any one of claims 1 to 6, characterized in that, serially welding the detected back contact solar cell to form a cell string. The insulating glue comprises at least a light initiator and a heat initiator; the light initiator is at least one of light initiator 819, light initiator 907, light initiator 651 and light initiator 127; 9. A photovoltaic module, characterized by, the heat initiator is at least one of peroxide dicarbonate, peroxide lauryl and peroxide dimethylbenzoyl. The photovoltaic module is prepared by the preparation method of the photovoltaic module according to any one of claims 1 to 8; wherein the photovoltaic module comprises a cover plate, an encapsulating layer and at least one cell string, the encapsulating layer is located between the cover plate and the cell string, the cover plate is connected with the cell string through the encapsulating layer, and the cell string comprises a plurality of back contact solar cells which are electrically connected with each other.

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