Double-sided photovoltaic module and preparation method thereof

Abstract

The invention provides a double-sided photovoltaic module and a preparation method thereof, and the preparation method of the double-sided photovoltaic module comprises the steps: enabling a first protection layer, a battery piece and a second protection layer to be sequentially stacked, and carrying out the first lamination processing, so as to obtain a battery unit; respectively arranging the first packaging layer and the second packaging layer on two opposite sides of the battery unit, and carrying out secondary lamination treatment to obtain a double-sided photovoltaic module; wherein one of the first protection layer and the second protection layer is located between the first packaging layer and the battery piece, and the other one of the first protection layer and the second protection layer is located between the second packaging layer and the battery piece. According to the preparation method of the double-sided photovoltaic module provided by the invention, the battery units are subjected to modular design and then are further packaged, so that when the battery units are short-circuited or damaged, only the battery units need to be replaced, the whole double-sided photovoltaic module does not need to be replaced, the rejection rate of products is reduced, and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell manufacturing, and in particular to a double-sided photovoltaic module and a preparation method thereof. Background Art

[0002] Portable photovoltaic products are innovative solar photovoltaic products. Traditional portable photovoltaic products mostly use fabric sewing technology, which has poor waterproof performance and is easy to get water in the circuit connection, thus causing the product to short-circuit. The method of preparing solar cells by integrated lamination has cumbersome operation steps, and when the solar cell is a foldable structure, the foldable structure of the solar cell is prone to short circuit, thus causing the solar cell to be scrapped.

[0003] Therefore, how to design a bifacial photovoltaic module with a simple structure, stability, reliability, and low scrap rate has become a problem that needs to be solved urgently. Summary of the invention

[0004] The present invention aims to at least solve the problems of solar cells being easily damaged and having a high scrap rate.

[0005] To this end, a first aspect of the present invention provides a method for preparing a bifacial photovoltaic module.

[0006] A second aspect of the present invention provides a bifacial photovoltaic module.

[0007] In view of this, the first aspect of the present invention proposes a method for preparing a bifacial photovoltaic module, the bifacial photovoltaic module comprising a battery cell, a first protective layer, a second protective layer, a first encapsulation layer and a second encapsulation layer, the method for preparing the bifacial photovoltaic module comprising: stacking the first protective layer, the battery cell and the second protective layer in sequence, and performing a first lamination process to obtain a battery cell; arranging the first encapsulation layer and the second encapsulation layer on opposite sides of the battery cell, respectively, and performing a second lamination process to obtain a bifacial photovoltaic module; wherein, one of the first protective layer and the second protective layer is located between the first encapsulation layer and the battery cell, and the other of the first protective layer and the second protective layer is located between the second encapsulation layer and the battery cell.

[0008] The preparation method of the double-sided photovoltaic module provided by the present invention can prepare the double-sided photovoltaic module, and the double-sided photovoltaic module includes a battery cell, a first protective layer, a second protective layer, a first encapsulation layer and a second encapsulation layer. During preparation, the first protective layer, the battery cell and the second protective layer can be stacked in sequence, and a first lamination process is performed to obtain a battery cell. Then the first encapsulation layer and the second encapsulation layer are respectively arranged on the opposite sides of the battery cell, and a second lamination process is performed, so that a double-sided photovoltaic module is obtained. Since the present application first modularizes the battery cell and then further encapsulates it, when the battery cell is short-circuited or damaged, it is only necessary to replace the battery cell, and there is no need to replace the double-sided photovoltaic module as a whole, which reduces the scrap rate of the product and saves costs. In addition, since the present application first modularizes the battery cell, it can also effectively improve the waterproof performance, stability and reliability of the product.

[0009] One of the first protection layer and the second protection layer is located between the first packaging layer and the battery cell, and the other of the first protection layer and the second protection layer is located between the second packaging layer and the battery cell.

[0010] The method for preparing a bifacial photovoltaic module provided by the present invention may also have the following additional technical features:

[0011] In some embodiments, optionally, the bifacial photovoltaic module further includes a bus bar, and the first protective layer, the battery cell, and the second protective layer are stacked in sequence, and a first lamination process is performed to obtain a battery cell, comprising: stacking the first protective layer, the battery cell, and the second protective layer in sequence; setting a portion of the structure of the bus bar between the first protective layer and the battery cell, or setting a portion of the structure of the bus bar between the second protective layer and the battery cell, and performing a first lamination process to obtain a battery cell.

[0012] In these embodiments, the bifacial photovoltaic module also includes a bus bar, which can be used to lead out the current generated by the battery cell. Therefore, when preparing the bifacial photovoltaic module, the first protective layer, the battery cell and the second protective layer can be stacked in sequence, and then part of the structure of the bus bar is set between the first protective layer and the battery cell, or part of the structure of the bus bar is set between the second protective layer and the battery cell, and a first lamination process is performed to obtain a battery unit, which can ensure the stability of the connection between the bus bar and the battery cell.

[0013] In some embodiments, optionally, the battery cell includes a plurality of battery cells, and the first packaging layer and the second packaging layer are respectively arranged on opposite sides of the battery cell, and a second lamination process is performed to obtain a bifacial photovoltaic module, comprising: electrically connecting the plurality of battery cells together to form a battery cell string; the first packaging layer and the second packaging layer are respectively arranged on opposite sides of the battery cell string, and a second lamination process is performed to obtain a bifacial photovoltaic module.

[0014] In these embodiments, the battery cells include multiple battery cells. Therefore, when preparing a double-sided photovoltaic module, the multiple battery cells can be electrically connected together to form a battery cell string. Then the first packaging layer and the second packaging layer are respectively arranged on the opposite sides of the battery cell string, and a second lamination process is performed to obtain a double-sided photovoltaic module. In this way, when one of the battery cells is damaged, only the damaged battery cell needs to be replaced, and there is no need to scrap the entire photovoltaic module, thereby saving costs.

[0015] In some embodiments, optionally, the bifacial photovoltaic module also includes a support frame, and the steps of stacking the first protective layer, the battery cell, and the second protective layer in sequence and performing a first lamination process to obtain a battery unit include: stacking the first protective layer, the battery cell, and the second protective layer in sequence; setting the support frame between the first protective layer and the second protective layer, and setting the battery cell in the support frame, and performing a first lamination process to obtain a battery unit.

[0016] In these embodiments, the bifacial photovoltaic module also includes a support frame. Therefore, when preparing the bifacial photovoltaic module, the first protective layer, the battery cell and the second protective layer can be stacked in sequence, and then the support frame is set between the first protective layer and the second protective layer, and the battery cell is set in the support frame, and the first lamination process is performed to obtain a battery unit. The support frame can enhance the impact resistance of the sides and corners of the battery cell. In addition, combining the battery cell and the support frame into a whole can better protect the battery cell, improve the strength of the battery cell against hidden cracks, and effectively reduce the hidden dangers of hidden cracks in the battery cell.

[0017] In some embodiments, optionally, the first lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different; the second lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different.

[0018] In these embodiments, the first lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different. That is, during the first lamination process, a certain force can be applied for a certain time, and then the same or different pressure can be applied to the battery cells before forming for a certain time. The reason for multiple lamination stages is that during the lamination process, the adhesive film gradually melts, so it is necessary to gradually apply pressure step by step to ensure the quality of the battery cells. Similarly, the same is required during the second lamination, and pressure needs to be applied step by step to ensure the quality of the bifacial photovoltaic modules.

[0019] In some embodiments, optionally, the first lamination process includes three-stage lamination; the temperature of the first lamination process is greater than or equal to 140°C and less than or equal to 150°C.

[0020] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the vacuuming time is greater than or equal to 300 s and less than or equal to 800 s.

[0021] In some embodiments, optionally, the first lamination process includes three stages of lamination; during the first lamination process, the pressure of one stage of lamination is greater than or equal to -80 kPa and less than or equal to -50 kPa.

[0022] In some embodiments, optionally, the first lamination process includes three stages of lamination; during the first lamination process, the time of one stage of lamination is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0023] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the pressure of the second-stage lamination is greater than or equal to -60 kPa and less than or equal to -40 kPa.

[0024] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the time of the second lamination stage is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0025] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the pressure of the three-stage lamination is greater than or equal to -20 kPa and less than or equal to 0 kPa.

[0026] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the time of the three-stage lamination is greater than or equal to 10 minutes and less than or equal to 30 minutes.

[0027] In some embodiments, optionally, the second lamination process includes three-stage lamination; the temperature of the second lamination process is greater than or equal to 140°C and less than or equal to 150°C.

[0028] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the vacuuming time is greater than or equal to 300 s and less than or equal to 800 s.

[0029] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the pressure of one stage of lamination is greater than or equal to -80 kPa and less than or equal to -50 kPa.

[0030] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the time of one stage of lamination is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0031] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the pressure of the second-stage lamination is greater than or equal to -60 kPa and less than or equal to -40 kPa.

[0032] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the time of the second lamination stage is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0033] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the pressure of the three-stage lamination is greater than or equal to -5 kpa and less than or equal to 0 kpa.

[0034] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the time of the three-stage lamination is greater than or equal to 10 minutes and less than or equal to 30 minutes.

[0035] In some embodiments, optionally, the cell includes at least one of a crystalline silicon cell and a thin film cell.

[0036] In these embodiments, the cell includes at least one of a crystalline silicon cell and a thin film cell. Crystalline silicon cells have high reliability and high conversion efficiency. Thin film cells have low cost and good flexibility.

[0037] In some embodiments, optionally, the thickness of the battery cell is greater than or equal to 100 μm and less than or equal to 200 μm.

[0038] In these embodiments, the thickness of the battery cell is set to be greater than or equal to 100 μm and less than or equal to 200 μm, which can ensure the service life of the battery cell. It is understandable that the battery cell itself is relatively thin and has a certain rigidity, so it is easy to crack during lamination. Therefore, limiting the thickness of the battery cell can ensure that the battery cell does not crack during the lamination process.

[0039] In some embodiments, optionally, the first protective layer includes a first PET layer and a first adhesive film layer, and the first adhesive film layer is disposed between the first PET layer and the battery sheet.

[0040] In these embodiments, the first protective layer includes a first PET layer and a first adhesive film layer, and the first adhesive film layer is disposed between the first PET layer and the battery cell, so that the first adhesive film layer can be used to bond the first PET layer and the battery cell together, thereby improving the stability of the battery unit. In addition, the first adhesive film layer can also shield the welding strip on the battery cell, thereby improving the overall aesthetics of the double-sided photovoltaic module. The first PET layer can protect the battery cell, for example, it can prevent the battery cell from contacting with water. Of course, the first PET layer can also play an insulating role.

[0041] In some embodiments, optionally, the second protective layer includes a second PET layer and a second adhesive film layer, and the second adhesive film layer is disposed between the second PET layer and the battery sheet.

[0042] In these embodiments, the second protective layer includes a second PET layer and a second adhesive film layer, and the second adhesive film layer is disposed between the second PET layer and the battery cell, so that the second PET layer and the battery cell can be bonded together by the second adhesive film layer to improve the stability of the battery unit. In addition, the second adhesive film layer can also shield the welding strip on the battery cell, thereby improving the overall aesthetics of the double-sided photovoltaic module. The second PET layer can protect the battery cell, for example, it can prevent the battery cell from contacting water. Of course, the second PET layer can also play an insulating role.

[0043] In some embodiments, optionally, the first encapsulation layer includes a first PVDF layer and a third adhesive film layer, and the third adhesive film layer is disposed between the first PVDF layer and the battery unit.

[0044] In these embodiments, the first encapsulation layer includes a first PVDF layer and a third adhesive film layer, and the third adhesive film layer is disposed between the first PVDF layer and the battery unit. The first PVDF layer can be UV-resistant and weather-resistant, thereby effectively protecting the battery unit. The third adhesive film layer can enhance the impact resistance of the bifacial photovoltaic module, so that the bifacial photovoltaic module can withstand stronger impacts.

[0045] In some embodiments, optionally, the second encapsulation layer includes a second PVDF layer and a fourth adhesive film layer, and the fourth adhesive film layer is disposed between the second PVDF layer and the battery unit.

[0046] In these embodiments, the second encapsulation layer includes a second PVDF layer and a fourth adhesive film layer, and the fourth adhesive film layer is disposed between the second PVDF layer and the battery unit. The second PVDF layer can be UV-resistant and weather-resistant, thereby effectively protecting the battery unit. The fourth adhesive film layer can enhance the impact resistance of the bifacial photovoltaic module, so that the bifacial photovoltaic module can withstand stronger impacts.

[0047] A second aspect of the present invention provides a double-sided photovoltaic module, which is prepared using the preparation method of the double-sided photovoltaic module in any technical solution of the first aspect.

[0048] According to the bifacial photovoltaic module provided by the present invention, the bifacial photovoltaic module is prepared by the preparation method of the bifacial photovoltaic module in any technical solution of the first aspect. Since the bifacial photovoltaic module is prepared by the preparation method of the bifacial photovoltaic module in any technical solution of the first aspect. Therefore, the bifacial photovoltaic module provided by the present invention also has all the beneficial effects of the preparation method of the bifacial photovoltaic module in any technical solution of the first aspect, which will not be repeated here.

[0049] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0051] Figure 1 One of the flow charts showing a method for preparing a bifacial photovoltaic module according to an embodiment of the present invention;

[0052] Figure 2 The second flowchart shows a method for preparing a double-sided photovoltaic module according to an embodiment of the present invention.

[0053] Figure 3 One of the structural schematic diagrams of a double-sided photovoltaic assembly according to an embodiment of the present invention is shown;

[0054] Figure 4 One of the structural schematic diagrams of a battery cell before lamination according to an embodiment of the present invention is shown;

[0055] Figure 5 The second schematic diagram of the structure of a battery cell before lamination according to an embodiment of the present invention is shown;

[0056] Figure 6A schematic diagram showing the structure of a battery unit after lamination according to an embodiment of the present invention is shown;

[0057] Figure 7 A second structural schematic diagram of a double-sided photovoltaic assembly according to an embodiment of the present invention is shown;

[0058] Figure 8 A third structural schematic diagram of a double-sided photovoltaic assembly according to an embodiment of the present invention is shown;

[0059] Fig. 9 A fourth structural schematic diagram of a double-sided photovoltaic assembly according to an embodiment of the present invention is shown;

[0060] Fig.10 A schematic structural diagram of a support frame according to an embodiment of the present invention is shown.

[0061] in, Figures 3 to 10 The corresponding relationship between the reference numerals and the component names is as follows:

[0062] 1 battery cell, 12 battery cell, 14 first protective layer, 142 first PET layer, 144 first film layer, 16 second protective layer, 162 second PET layer, 164 second film layer, 2 first packaging layer, 22 first PVDF layer, 24 third film layer, 3 second packaging layer, 32 second PVDF layer, 34 fourth film layer, 4 bus bar, 5 support frame, 6 battery cell string, 7 resin layer, 8 glass fiber layer, 9 copper tape. DETAILED DESCRIPTION

[0063] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0064] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0065] Refer to the following Figures 1 to 10 A bifacial photovoltaic module and a method for preparing the same are described according to some embodiments of the present invention.

[0066] In one embodiment of the first aspect of the present application, Figure 1 As shown, the first aspect of the present invention provides a method for preparing a bifacial photovoltaic module, the bifacial photovoltaic module comprising a cell, a first protective layer, a second protective layer, a first encapsulation layer and a second encapsulation layer, the method for preparing the bifacial photovoltaic module comprising:

[0067] S102, stacking the first protection layer, the battery cell and the second protection layer in sequence, and performing a first lamination process to obtain a battery unit.

[0068] S104, disposing the first encapsulation layer and the second encapsulation layer on opposite sides of the battery unit respectively, and performing a second lamination process to obtain a double-sided photovoltaic module.

[0069] One of the first protection layer and the second protection layer is located between the first packaging layer and the battery cell, and the other of the first protection layer and the second protection layer is located between the second packaging layer and the battery cell.

[0070] The preparation method of the double-sided photovoltaic module provided by the present invention can prepare the double-sided photovoltaic module, and the double-sided photovoltaic module includes a battery cell, a first protective layer, a second protective layer, a first encapsulation layer and a second encapsulation layer. During preparation, the first protective layer, the battery cell and the second protective layer can be stacked in sequence, and a first lamination process is performed to obtain a battery cell. Then the first encapsulation layer and the second encapsulation layer are respectively arranged on the opposite sides of the battery cell, and a second lamination process is performed, so that a double-sided photovoltaic module is obtained. Since the present application first modularizes the battery cell and then further encapsulates it, when the battery cell is short-circuited or damaged, it is only necessary to replace the battery cell, and there is no need to replace the double-sided photovoltaic module as a whole, which reduces the scrap rate of the product and saves costs. In addition, since the present application first modularizes the battery cell, it can also effectively improve the waterproof performance, stability and reliability of the product.

[0071] One of the first protection layer and the second protection layer is located between the first packaging layer and the battery cell, and the other of the first protection layer and the second protection layer is located between the second packaging layer and the battery cell.

[0072] Among them, in order to improve the power generation and power generation efficiency in this field, basically multiple battery cells are used in series or in parallel, that is, multiple battery cells are arranged between the first packaging layer and the second packaging layer for series or parallel connection. Therefore, in the scheme of integral lamination of photovoltaic modules in the related art, when one of the battery cells is damaged, the photovoltaic module as a whole needs to be replaced, which increases the scrap rate and the cost. However, the present application only needs to replace the damaged battery cells, and there is no need to scrap the entire photovoltaic module, so it can save costs.

[0073] In some embodiments, optionally, the bifacial photovoltaic module further includes a bus bar, and the first protective layer, the battery cell, and the second protective layer are stacked in sequence, and a first lamination process is performed to obtain a battery cell, comprising: stacking the first protective layer, the battery cell, and the second protective layer in sequence; setting a portion of the structure of the bus bar between the first protective layer and the battery cell, or setting a portion of the structure of the bus bar between the second protective layer and the battery cell, and performing a first lamination process to obtain a battery cell.

[0074] In these embodiments, the bifacial photovoltaic module also includes a bus bar, which can be used to lead out the current generated by the battery cell. Therefore, when preparing the bifacial photovoltaic module, the first protective layer, the battery cell and the second protective layer can be stacked in sequence, and then part of the structure of the bus bar is set between the first protective layer and the battery cell, or part of the structure of the bus bar is set between the second protective layer and the battery cell, and a first lamination process is performed to obtain a battery unit, which can ensure the stability of the connection between the bus bar and the battery cell.

[0075] In some embodiments, optionally, the battery cell includes a plurality of battery cells, and the first packaging layer and the second packaging layer are respectively arranged on opposite sides of the battery cell, and a second lamination process is performed to obtain a bifacial photovoltaic module, comprising: electrically connecting the plurality of battery cells together to form a battery cell string; the first packaging layer and the second packaging layer are respectively arranged on opposite sides of the battery cell string, and a second lamination process is performed to obtain a bifacial photovoltaic module.

[0076] In these embodiments, the battery cells include multiple battery cells. Therefore, when preparing a double-sided photovoltaic module, the multiple battery cells can be electrically connected together to form a battery cell string. Then the first packaging layer and the second packaging layer are respectively arranged on the opposite sides of the battery cell string, and a second lamination process is performed to obtain a double-sided photovoltaic module. In this way, when one of the battery cells is damaged, only the damaged battery cell needs to be replaced, and there is no need to scrap the entire photovoltaic module, thereby saving costs.

[0077] In some embodiments, optionally, the bifacial photovoltaic module also includes a support frame, and the steps of stacking the first protective layer, the battery cell, and the second protective layer in sequence and performing a first lamination process to obtain a battery unit include: stacking the first protective layer, the battery cell, and the second protective layer in sequence; setting the support frame between the first protective layer and the second protective layer, and setting the battery cell in the support frame, and performing a first lamination process to obtain a battery unit.

[0078] In these embodiments, the bifacial photovoltaic module also includes a support frame. Therefore, when preparing the bifacial photovoltaic module, the first protective layer, the battery cell and the second protective layer can be stacked in sequence, and then the support frame is set between the first protective layer and the second protective layer, and the battery cell is set in the support frame, and the first lamination process is performed to obtain a battery unit. The support frame can enhance the impact resistance of the sides and corners of the battery cell. In addition, combining the battery cell and the support frame into a whole can better protect the battery cell, improve the strength of the battery cell against hidden cracks, and effectively reduce the hidden dangers of hidden cracks in the battery cell.

[0079] In some embodiments, optionally, the first lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different; the second lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different.

[0080] In these embodiments, the first lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different. That is, during the first lamination process, a certain force can be applied for a certain time, and then the same or different pressure can be applied to the battery cells before forming for a certain time. The reason for multiple lamination stages is that during the lamination process, the adhesive film gradually melts, so it is necessary to gradually apply pressure step by step to ensure the quality of the battery cells. Similarly, the same is required during the second lamination, and pressure needs to be applied step by step to ensure the quality of the bifacial photovoltaic modules.

[0081] In some embodiments, optionally, the first lamination process includes three-stage lamination; the temperature of the first lamination process is greater than or equal to 140°C and less than or equal to 150°C.

[0082] In some embodiments, optionally, the temperature of the first lamination process is 140°C.

[0083] In some embodiments, optionally, the temperature of the first lamination process is 142°C.

[0084] In some embodiments, optionally, the temperature of the first lamination process is 145°C.

[0085] In some embodiments, optionally, the temperature of the first lamination process is 148°C.

[0086] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the vacuuming time is greater than or equal to 300 s and less than or equal to 800 s.

[0087] In some embodiments, optionally, during the first lamination process, the vacuuming time is 400 seconds.

[0088] In some embodiments, optionally, during the first lamination process, the vacuuming time is 500 seconds.

[0089] In some embodiments, optionally, during the first lamination process, the vacuuming time is 600 seconds.

[0090] In some embodiments, optionally, during the first lamination process, the vacuuming time is 700 seconds.

[0091] In some embodiments, optionally, the first lamination process includes three stages of lamination; during the first lamination process, the pressure of one stage of lamination is greater than or equal to -80 kPa and less than or equal to -50 kPa.

[0092] In some embodiments, optionally, during the first lamination process, a lamination pressure is -70 kPa.

[0093] In some embodiments, optionally, during the first lamination process, a lamination pressure is -60 kPa.

[0094] In some embodiments, optionally, the first lamination process includes three stages of lamination; during the first lamination process, the time of one stage of lamination is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0095] In some embodiments, optionally, during the first lamination process, a lamination period is 40 seconds.

[0096] In some embodiments, optionally, during the first lamination process, a lamination time is 50 seconds.

[0097] In some embodiments, optionally, during the first lamination process, a lamination period lasts for 60 seconds.

[0098] In some embodiments, optionally, during the first lamination process, a lamination period lasts for 70 seconds.

[0099] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the pressure of the second-stage lamination is greater than or equal to -60 kPa and less than or equal to -40 kPa.

[0100] In some embodiments, optionally, during the first lamination process, the pressure of the second lamination is -55 kPa.

[0101] In some embodiments, optionally, during the first lamination process, the pressure of the second lamination is -50 kPa.

[0102] In some embodiments, optionally, during the first lamination process, the pressure of the second lamination is -45 kPa.

[0103] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the time of the second lamination stage is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0104] In some embodiments, optionally, during the first lamination process, the second lamination time is 40 seconds.

[0105] In some embodiments, optionally, during the first lamination process, the second lamination time is 50 seconds.

[0106] In some embodiments, optionally, during the first lamination process, the time for the second lamination is 60 seconds.

[0107] In some embodiments, optionally, during the first lamination process, the time for the second lamination is 70 seconds.

[0108] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the pressure of the three-stage lamination is greater than or equal to -20 kPa and less than or equal to 0 kPa.

[0109] In some embodiments, optionally, during the first lamination process, the pressure of the three-stage lamination is -15 kPa.

[0110] In some embodiments, optionally, during the first lamination process, the pressure of the three-stage lamination is -10 kPa.

[0111] In some embodiments, optionally, during the first lamination process, the pressure of the three-stage lamination is -5 kPa.

[0112] In some embodiments, optionally, the first lamination process includes three-stage lamination; during the first lamination process, the time of the three-stage lamination is greater than or equal to 10 minutes and less than or equal to 30 minutes.

[0113] In some embodiments, optionally, during the first lamination process, the time for the three-stage lamination is 15 minutes.

[0114] In some embodiments, optionally, during the first lamination process, the time for the three-stage lamination is 20 minutes.

[0115] In some embodiments, optionally, during the first lamination process, the time for the three-stage lamination is 25 minutes.

[0116] In some embodiments, optionally, the second lamination process includes three-stage lamination; the temperature of the second lamination process is greater than or equal to 140°C and less than or equal to 150°C.

[0117] In some embodiments, optionally, the temperature of the second lamination process is 140°C.

[0118] In some embodiments, optionally, the temperature of the second lamination process is 145°C.

[0119] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the vacuuming time is greater than or equal to 300 s and less than or equal to 800 s.

[0120] In some embodiments, optionally, during the second lamination process, the vacuuming time is 400 seconds.

[0121] In some embodiments, optionally, during the second lamination process, the vacuuming time is 500 seconds.

[0122] In some embodiments, optionally, during the second lamination process, the vacuuming time is 600 seconds.

[0123] In some embodiments, optionally, during the second lamination process, the vacuuming time is 700 seconds.

[0124] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the pressure of one stage of lamination is greater than or equal to -80 kPa and less than or equal to -50 kPa.

[0125] In some embodiments, optionally, during the second lamination process, a lamination pressure is -70 kPa.

[0126] In some embodiments, optionally, during the second lamination process, a lamination pressure is -60 kPa.

[0127] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the time of one stage of lamination is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0128] In some embodiments, optionally, during the second lamination process, a lamination period lasts for 40 seconds.

[0129] In some embodiments, optionally, during the second lamination process, a lamination period lasts for 50 seconds.

[0130] In some embodiments, optionally, during the second lamination process, a lamination period lasts for 60 seconds.

[0131] In some embodiments, optionally, during the second lamination process, a lamination period lasts for 70 seconds.

[0132] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the pressure of the second-stage lamination is greater than or equal to -60 kPa and less than or equal to -40 kPa.

[0133] In some embodiments, optionally, during the second lamination process, the pressure of the second lamination is -55 kPa.

[0134] In some embodiments, optionally, during the second lamination process, the pressure of the second lamination is -50 kPa.

[0135] In some embodiments, optionally, during the second lamination process, the pressure of the second lamination is -45 kPa.

[0136] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the time of the second lamination stage is greater than or equal to 30 seconds and less than or equal to 80 seconds.

[0137] In some embodiments, optionally, during the second lamination process, the second lamination time is 40 seconds.

[0138] In some embodiments, optionally, during the second lamination process, the second lamination time is 50 seconds.

[0139] In some embodiments, optionally, during the second lamination process, the second lamination time is 60 seconds.

[0140] In some embodiments, optionally, during the second lamination process, the second lamination time is 70 seconds.

[0141] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the pressure of the three-stage lamination is greater than or equal to -5 kpa and less than or equal to 0 kpa.

[0142] In some embodiments, optionally, during the second lamination process, the pressure of the three-stage lamination is -4 kPa.

[0143] In some embodiments, optionally, during the second lamination process, the pressure of the three-stage lamination is -3 kPa.

[0144] In some embodiments, optionally, during the second lamination process, the pressure of the three-stage lamination is -2 kPa.

[0145] In some embodiments, optionally, during the second lamination process, the pressure of the three-stage lamination is -1 kPa.

[0146] In some embodiments, optionally, the second lamination process includes three-stage lamination; during the second lamination process, the time of the three-stage lamination is greater than or equal to 10 minutes and less than or equal to 30 minutes.

[0147] In some embodiments, optionally, during the second lamination process, the time for the three-stage lamination is 15 minutes.

[0148] In some embodiments, optionally, during the second lamination process, the time for the three-stage lamination is 20 minutes.

[0149] In some embodiments, optionally, during the second lamination process, the time for the three-stage lamination is 25 minutes.

[0150] In some embodiments, optionally, the first protective layer 14 includes a first PET layer 142 and a first adhesive film layer 144 , and the first adhesive film layer 144 is disposed between the first PET layer 142 and the battery cell 12 .

[0151] In these embodiments, the first protective layer 14 includes a first PET layer 142 and a first adhesive film layer 144, and the first adhesive film layer 144 is disposed between the first PET layer 142 and the battery cell 12, so that the first adhesive film layer 144 can be used to bond the first PET layer 142 and the battery cell 12 together, thereby improving the stability of the battery unit 1. In addition, the first adhesive film layer 144 can also shield the welding strip on the battery cell 12, thereby improving the overall aesthetics of the double-sided photovoltaic module. The first PET layer 142 can protect the battery cell 12, for example, it can prevent the battery cell 12 from contacting with water. Of course, the first PET layer 142 can also play an insulating role.

[0152] In some embodiments, optionally, the second protective layer 16 includes a second PET layer 162 and a second adhesive film layer 164 , and the second adhesive film layer 164 is disposed between the second PET layer 162 and the battery cell 12 .

[0153] In these embodiments, the second protective layer 16 includes a second PET layer 162 and a second adhesive film layer 164, and the second adhesive film layer 164 is arranged between the second PET layer 162 and the battery cell 12, so that the second PET layer 162 and the battery cell 12 can be bonded together by the second adhesive film layer 164 to improve the stability of the battery unit 1. In addition, the second adhesive film layer 164 can also shield the welding strip on the battery cell 12, thereby improving the overall aesthetics of the double-sided photovoltaic module. The second PET layer 162 can protect the battery cell 12, for example, it can prevent the battery cell 12 from contacting with water. Of course, the second PET layer 162 can also play an insulating role.

[0154] In some embodiments, optionally, the cell 12 includes at least one of a crystalline silicon cell and a thin film cell.

[0155] In these embodiments, the cell 12 includes at least one of a crystalline silicon cell and a thin film cell. Crystalline silicon cells have high reliability and high conversion efficiency. Thin film cells have low cost and good flexibility.

[0156] In some embodiments, optionally, the thickness of the battery cell 12 is greater than or equal to 100 μm and less than or equal to 200 μm.

[0157] In these embodiments, the thickness of the battery cell 12 is set to be greater than or equal to 100 μm and less than or equal to 200 μm, which can ensure the service life of the battery cell 12. It can be understood that the battery cell 12 itself is relatively thin and has a certain rigidity, so it is easy to crack during lamination. Therefore, limiting the thickness of the battery cell 12 can ensure that the battery cell 12 does not crack during the lamination process.

[0158] In some embodiments, optionally, the thickness of the battery cell 12 is 110 μm.

[0159] In some embodiments, optionally, the thickness of the battery cell 12 is 130 μm.

[0160] In some embodiments, optionally, the thickness of the battery cell 12 is 150 μm.

[0161] In some embodiments, optionally, the thickness of the battery cell 12 is 170 μm.

[0162] In some embodiments, optionally, the thickness of the battery cell 12 is 190 μm.

[0163] In some embodiments, optionally, Figure 3 and Figure 7 As shown, the first encapsulation layer 2 includes a first PVDF layer 22 and a third adhesive film layer 24 , and the third adhesive film layer 24 is disposed between the first PVDF layer 22 and the battery unit 1 .

[0164] In these embodiments, the first encapsulation layer 2 includes a first PVDF layer 22 and a third adhesive film layer 24, and the third adhesive film layer 24 is disposed between the first PVDF layer 22 and the battery unit 1. The first PVDF layer 22 can be provided to provide UV resistance and weather resistance, thereby effectively protecting the battery unit 1. The third adhesive film layer 24 can enhance the impact resistance of the bifacial photovoltaic module, so that the bifacial photovoltaic module can withstand stronger impacts.

[0165] In some embodiments, optionally, Figure 3and Figure 7 As shown, the second encapsulation layer 3 includes a second PVDF layer 32 and a fourth adhesive film layer 34 , and the fourth adhesive film layer 34 is disposed between the second PVDF layer 32 and the battery unit 1 .

[0166] In these embodiments, the second encapsulation layer 3 includes a second PVDF layer 32 and a fourth adhesive film layer 34, and the fourth adhesive film layer 34 is disposed between the second PVDF layer 32 and the battery unit 1. The second PVDF layer 32 can be provided to provide UV resistance and weather resistance, thereby effectively protecting the battery unit 1. The fourth adhesive film layer 34 can enhance the impact resistance of the bifacial photovoltaic module, so that the bifacial photovoltaic module can withstand stronger impacts.

[0167] like Figure 2 As shown, the first aspect of the present invention provides a method for preparing a bifacial photovoltaic module, comprising:

[0168] S202, welding the battery cells, welding includes dicing, string welding and convergence welding.

[0169] S204, stacking and laying the PET, the adhesive film, the battery cell, the adhesive film, the support frame and the PET in sequence, and laminating them once to form a primary laminate.

[0170] S206, stacking and laying the PVDF, the adhesive film, the primary laminate, the adhesive film and the PVDF for a second time, and performing secondary lamination.

[0171] S208, cooling and cutting the parts after secondary lamination.

[0172] S210, install the handle and pack.

[0173] The first aspect of the present invention provides a method for preparing a double-sided photovoltaic module, wherein a first PVDF layer, a third film layer, a first PET layer, a first film layer, a battery cell, a support frame, a second film layer, a second PET layer, a fourth film layer, and a second PVDF layer are sequentially stacked, and overall packaging is achieved through a two-step lamination process. The method for preparing a double-sided photovoltaic module includes:

[0174] Step 1: Divide the photovoltaic product into multiple sub-units.

[0175] Step 2: Perform the first lamination process on each sub-unit to combine the battery cell and the PET backplane into a whole.

[0176] In some embodiments, optionally, the first PET layer and the second PET layer have bonding and protection functions.

[0177] In some embodiments, optionally, the first adhesive film layer, the second adhesive film layer, the third adhesive film layer and the fourth adhesive film layer can be made of materials such as organic silicone such as EVA, POE, PVB, EPE, etc.

[0178] In some embodiments, optionally, the cell is a crystalline silicon cell or a thin film cell.

[0179] In some embodiments, optionally, the support frame may be at least one of a carbon fiber frame, a glass fiber frame, a basalt glass fiber frame, a polyurethane glass fiber frame, and a metal frame.

[0180] In some embodiments, the cell is optionally a crystalline silicon cell, and the thickness of the crystalline silicon cell is between 100 μm and 200 μm. Since the crystalline silicon cell itself is thin and has a certain rigidity, the product is prone to cracking when subjected to force during lamination. During the lamination process, the first PET layer, the first adhesive film layer, the cell, the support frame, the second adhesive film layer, and the second PET layer are bonded and cured under the combined action of temperature and pressure. The cell and the support frame are combined into a whole, which can better protect the cell, improve the strength of the crystalline silicon cell against cracking, and effectively reduce the hidden danger of cracking of the cell.

[0181] In some embodiments, optionally, during the first lamination process, since the adhesive layer of the first PET layer cannot be directly used on the front side of the battery cell, a third adhesive film layer needs to be applied on the front side to encapsulate and protect the front side of the battery cell.

[0182] In some embodiments, the subunits (battery units) after the first lamination process are optionally subjected to a second lamination process to achieve overall packaging. A modular design is adopted to facilitate the individual replacement of a faulty subunit.

[0183] In some embodiments, optionally, the first PET layer, the first adhesive film layer, the battery cell, the support frame, the second adhesive film layer and the second PET layer are laid in order from bottom to top, and then laminated using a laminator. During lamination, a high temperature cloth or tape is required to isolate the busbar area to be connected to prevent the adhesive film from covering during lamination. The first lamination process parameters are shown in Table 1 below.

[0184] Table 1 Parameter range of the first lamination process

[0185]

[0186] In some embodiments, optionally, after the first lamination process is completed, the two first lamination products are combined together for a second lamination process, and the busbars are connected using copper tape. In order to achieve the waterproof effect IP68, the third film layer, the fourth film layer, the first PVDF layer and the second PVDF layer need to be added during the second lamination process. The laying order is: the first PVDF layer, the third film layer + the first lamination product + the fourth film layer + the second PVDF layer, according to Figure 4 The layers are stacked in the order of , and a second lamination process is performed. The parameters of the second lamination process are shown in Table 2 below.

[0187] Table 2 Parameter range of the second lamination process

[0188]

[0189]

[0190] This application divides photovoltaic products into sub-units for modular design and adopts a two-step lamination process for packaging, which effectively improves the waterproof performance, stability and reliability of the product, while reducing production costs and scrap rates, and is suitable for large-scale production of portable photovoltaic products.

[0191] The beneficial effects of this application are as follows:

[0192] 1. This application combines the battery cell and the PET backplane into a whole through a single lamination process, thereby improving the resistance of the crystalline silicon battery cell to hidden cracks, effectively reducing the probability of hidden cracks in the battery cell, and thus improving the stability and reliability of the product.

[0193] 2. This application not only improves production efficiency through modular design, but also reduces the risk of short circuit and scrapping of portable multi-fold products during the production process.

[0194] 3. This application improves the waterproof performance and weather resistance of portable photovoltaic products through modular laminated packaging.

[0195] 4. This application has the advantages of simple structure, high production efficiency and low cost, is suitable for large-scale production, and has high market application value.

[0196] A second aspect of the present invention provides a bifacial photovoltaic module, which is prepared using the method for preparing a bifacial photovoltaic module in any one of the embodiments of the first aspect.

[0197] According to the bifacial photovoltaic module provided by the present invention, the bifacial photovoltaic module is prepared by the preparation method of the bifacial photovoltaic module in any one of the embodiments of the first aspect. Since the bifacial photovoltaic module is prepared by the preparation method of the bifacial photovoltaic module in any one of the embodiments of the first aspect. Therefore, the bifacial photovoltaic module provided by the present invention also has all the beneficial effects of the preparation method of the bifacial photovoltaic module in any one of the embodiments of the first aspect, which will not be repeated here.

[0198] In some embodiments, optionally, Figures 3 to 10 As shown, the bifacial photovoltaic module includes at least one battery cell 1, a first encapsulation layer 2 and a second encapsulation layer 3. The battery cell 1 is a laminate, and the first encapsulation layer 2 is pressed on one side of the battery cell 1 to protect one side of the battery cell 1. The second encapsulation layer 3 is pressed on the other side of the battery cell 1 to protect the other side of the battery cell 1.

[0199] The double-sided photovoltaic module provided by the present invention includes at least one battery cell 1, a first encapsulation layer 2 and a second encapsulation layer 3. At least one battery cell 1 is a laminate, that is, the battery cell 1 is first laminated to form a modular structure, and then the first encapsulation layer 2 and the second encapsulation layer 3 are used to press-fit the battery cell 1 to protect both sides of the battery cell 1, thereby forming a double-sided photovoltaic module. It can be understood that since the present application first modularizes the battery cell 1 and then further encapsulates it, when the battery cell 1 is short-circuited or damaged, it is only necessary to replace the battery cell 1, and there is no need to replace the entire double-sided photovoltaic module, which reduces the scrap rate of the product and saves costs. In addition, since the present application first sets the battery cell 1 as a laminate, it can also effectively improve the waterproof performance, stability and reliability of the product.

[0200] Among them, in order to improve the power generation and power generation efficiency in this field, multiple battery cells are basically used in series or in parallel, that is, multiple battery cells 1 are arranged between the first encapsulation layer 2 and the second encapsulation layer 3 for series or parallel connection. Therefore, in the scheme of integral lamination of photovoltaic modules in the related art, when one of the battery cells 1 is damaged, the photovoltaic module as a whole needs to be replaced, which increases the scrap rate and the cost. However, the present application only needs to replace the damaged battery cell 1, and there is no need to scrap the entire photovoltaic module, so it can save costs.

[0201] In some embodiments, the battery cell 1 optionally includes a bifacial battery cell, which can achieve bifacial power generation.

[0202] In some embodiments, optionally, Figure 4 , Figure 5 and Figure 6As shown, the battery unit 1 includes: a battery cell 12; a first protective layer 14, which is pressed on one side of the battery cell 12 to protect one side of the battery cell 12; and a second protective layer 16, which is pressed on the other side of the battery cell 12 to protect the other side of the battery cell 12.

[0203] In these embodiments, the battery cell 1 includes a battery cell 12, a first protective layer 14, and a second protective layer 16. The first protective layer 14 and the second protective layer 16 are respectively pressed on opposite sides of the battery cell 12, thereby protecting the opposite sides of the battery cell 12, preventing the battery cell 12 from being damaged, and improving the service life of the battery cell 12. It can be understood that the present application laminates the battery cell 12, the first protective layer 14, and the second protective layer 16 as a whole to form a laminate, so that the service life of the battery cell 12 can be improved and the battery cell 1 can be easily replaced.

[0204] In some embodiments, the battery cell 12 is optionally a double-sided battery cell.

[0205] In some embodiments, optionally, Fig. 9 As shown, the bifacial photovoltaic module further includes: a bus bar 4 connected to the battery cell 12 and located between the battery cell 12 and the first protective layer 14 , or between the battery cell 12 and the second protective layer 16 .

[0206] In these embodiments, the bus bar 4 may be provided to lead out the current generated by the battery cell 12. Specifically, the bus bar 4 may be connected to the battery cell 12 and provided between the battery cell 12 and the first protective layer 14, or provided between the battery cell 12 and the second protective layer 16, so that when the battery cell 1 is laminated, the bus bar 4 may also be laminated together, thereby ensuring the stability of the connection between the bus bar 4 and the battery cell 12. In order to ensure that the bus bar 4 can be connected to other battery cells 1, the bus bar 4 is partially provided between the battery cell 12 and the first protective layer 14 or the second protective layer 16, that is, the bus bar 4 is exposed to ensure that the bus bar 4 can be connected.

[0207] In some embodiments, optionally, the busbar 4 includes a positive busbar 4 and a negative busbar 4 .

[0208] In some embodiments, optionally, Figure 5 , Figure 6 and Figure 7 As shown, the double-sided photovoltaic module also includes: a support frame 5, which is arranged between the first protective layer 14 and the second protective layer 16, the solar cell 12 is located in the support frame 5, the first protective layer 14 is pressed on one side of the support frame 5, and the second protective layer 16 is pressed on the other side of the support frame 5.

[0209] In these embodiments, a support frame 5 can be provided to protect the battery cell 12, thereby increasing the service life of the battery cell 12. Specifically, the support frame 5 can be provided between the first protective layer 14 and the second protective layer 16, and the battery cell 12 can be provided in the support frame 5, and then the first protective layer 14 and the second protective layer 16 can be pressed on both sides of the support frame 5, so that the battery cell 12 can be protected by the support frame 5. It can be understood that the provision of the support frame 5 can enhance the impact resistance of the sides and corners of the battery cell 12. In addition, combining the battery cell 12 and the support frame 5 into a whole can better protect the battery cell 12, improve the strength of the battery cell 12 against hidden cracks, and effectively reduce the hidden dangers of hidden cracks of the battery cell 12.

[0210] In some embodiments, optionally, the support frame 5 includes at least one of a carbon fiber frame, a glass fiber frame, a basalt glass fiber frame, a polyurethane glass fiber frame and a metal frame.

[0211] In these embodiments, the support frame 5 includes at least one of a carbon fiber frame, a glass fiber frame, a basalt glass fiber frame, a polyurethane glass fiber frame and a metal frame. The carbon fiber frame has the advantages of high strength, light weight, fatigue resistance and corrosion resistance, and can effectively protect the battery cell 12. The glass fiber frame has low cost and good corrosion resistance and insulation. The basalt glass fiber frame has the advantages of environmental protection, high temperature resistance and high strength. The polyurethane glass fiber frame has good toughness and elasticity, good thermal insulation performance, and good wear resistance. The metal frame has high strength, good thermal conductivity and electrical conductivity, and good machinability.

[0212] In a specific embodiment, optionally, Fig.10 As shown, the support frame 5 includes a resin layer 7 and a glass fiber layer 8 .

[0213] In some embodiments, optionally, Figure 8 As shown, the battery cell 1 includes a plurality of battery cells 1 , which are electrically connected to each other to form a battery cell string 6 , a first packaging layer 2 is pressed onto one side of the battery cell string 6 , and a second packaging layer 3 is pressed onto the other side of the battery cell string 6 .

[0214] In these embodiments, a plurality of battery cells 1 may be provided and electrically connected to each other to form a battery cell string 6, thereby improving power generation and power generation efficiency. The first encapsulation layer 2 is pressed onto one side of the battery cell string 6, and the second encapsulation layer 3 is pressed onto the other side of the battery cell string 6, thereby forming a double-sided photovoltaic module. In this way, when one of the battery cells 1 is damaged, only the damaged battery cell 1 needs to be replaced, and the entire photovoltaic module does not need to be scrapped, thereby saving costs.

[0215] In some embodiments, optionally, the bifacial photovoltaic module is a foldable module.

[0216] In some embodiments, a handle is optionally included to facilitate installation and movement of the bifacial photovoltaic module.

[0217] In some embodiments, optionally, after the first lamination process is completed, two products of the first lamination process are combined together and subjected to a second lamination process, and the busbars 4 are connected using copper tapes 9 .

[0218] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0219] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0220] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a double-sided photovoltaic module, characterized in that: The bifacial photovoltaic module comprises a cell sheet, a first protective layer, a second protective layer, a first encapsulation layer and a second encapsulation layer. The preparation method of the bifacial photovoltaic module comprises: The first protective layer, the battery cell and the second protective layer are stacked in sequence and subjected to a first lamination process to obtain a battery cell; Disposing the first encapsulation layer and the second encapsulation layer on opposite sides of the battery unit respectively, and performing a second lamination process to obtain the bifacial photovoltaic module; One of the first protection layer and the second protection layer is located between the first packaging layer and the battery cell, and the other of the first protection layer and the second protection layer is located between the second packaging layer and the battery cell.

2. The method for preparing a double-sided photovoltaic module according to claim 1, characterized in that: The bifacial photovoltaic module further includes a bus bar. The step of stacking the first protective layer, the battery sheet and the second protective layer in sequence and performing a first lamination process to obtain a battery unit includes: The first protective layer, the battery cell and the second protective layer are stacked in sequence; A partial structure of the bus bar is disposed between the first protective layer and the battery cell, or a partial structure of the bus bar is disposed between the second protective layer and the battery cell, and the first lamination process is performed to obtain the battery unit.

3. The method for preparing a double-sided photovoltaic module according to claim 1, characterized in that: The battery unit includes a plurality of cells, and the steps of arranging the first encapsulation layer and the second encapsulation layer on opposite sides of the battery unit, respectively, and performing a second lamination process to obtain the bifacial photovoltaic module include: electrically connecting a plurality of the battery cells together to form a battery cell string; The first encapsulation layer and the second encapsulation layer are respectively arranged on two opposite sides of the battery unit string, and the second lamination process is performed to obtain the double-sided photovoltaic module.

4. The method for preparing a double-sided photovoltaic module according to claim 1, characterized in that: The bifacial photovoltaic assembly further includes a support frame. The step of stacking the first protective layer, the battery sheet and the second protective layer in sequence and performing a first lamination process to obtain a battery unit includes: The first protective layer, the battery cell and the second protective layer are stacked in sequence; The support frame is disposed between the first protection layer and the second protection layer, and the battery cell is disposed in the support frame, and the first lamination process is performed to obtain the battery unit.

5. The method for preparing a bifacial photovoltaic module according to any one of claims 1 to 4, characterized in that: The first lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different; The second lamination process includes multiple lamination stages, and the time of each lamination stage is the same or different, and the pressure of each lamination stage is the same or different.

6. The method for preparing a double-sided photovoltaic module according to claim 5, characterized in that: The first lamination process includes three stages of lamination; The temperature of the first lamination process is greater than or equal to 140° C. and less than or equal to 150° C.; and / or During the first lamination process, the vacuuming time is greater than or equal to 300 seconds and less than or equal to 800 seconds; and / or During the first lamination process, the pressure of a lamination section is greater than or equal to -80 kPa and less than or equal to -50 kPa; and / or During the first lamination process, a lamination period lasts for 30 seconds or more and 80 seconds or less; and / or During the first lamination process, the pressure of the second lamination is greater than or equal to -60 kPa and less than or equal to -40 kPa; and / or During the first lamination process, the second lamination time is greater than or equal to 30 seconds and less than or equal to 80 seconds; and / or During the first lamination process, the pressure of the three-stage lamination is greater than or equal to -20 kPa and less than or equal to 0 kPa; and / or During the first lamination process, the time for the three-stage lamination is greater than or equal to 10 minutes and less than or equal to 30 minutes.

7. The method for preparing a double-sided photovoltaic module according to claim 5, characterized in that: The second lamination process includes three stages of lamination; The temperature of the second lamination process is greater than or equal to 140° C. and less than or equal to 150° C.; and / or During the second lamination process, the vacuuming time is greater than or equal to 300 seconds and less than or equal to 800 seconds; and / or During the second lamination process, the pressure of a lamination stage is greater than or equal to -80 kPa and less than or equal to -50 kPa; and / or During the second lamination process, a lamination period lasts for 30 seconds or more and 80 seconds or less; and / or During the second lamination process, the pressure of the second lamination is greater than or equal to -60 kPa and less than or equal to -40 kPa; and / or During the second lamination process, the second lamination time is greater than or equal to 30 seconds and less than or equal to 80 seconds; and / or During the second lamination process, the pressure of the three-stage lamination is greater than or equal to -5kpa and less than or equal to 0kpa; and / or During the second lamination process, the time for the three-stage lamination is greater than or equal to 10 minutes and less than or equal to 30 minutes.

8. The method for preparing a bifacial photovoltaic module according to any one of claims 1 to 4, characterized in that: The battery cell includes at least one of a crystalline silicon battery cell and a thin film battery cell.

9. The method for preparing a bifacial photovoltaic module according to any one of claims 1 to 4, characterized in that: The thickness of the battery cell is greater than or equal to 100 μm and less than or equal to 200 μm.

10. The method for preparing a bifacial photovoltaic module according to any one of claims 1 to 4, characterized in that: The first protective layer includes a first PET layer and a first adhesive film layer, and the first adhesive film layer is arranged between the first PET layer and the battery sheet; and / or The second protective layer includes a second PET layer and a second adhesive film layer, and the second adhesive film layer is arranged between the second PET layer and the battery sheet.

11. The method for preparing a bifacial photovoltaic module according to any one of claims 1 to 4, characterized in that: The first encapsulation layer includes a first PVDF layer and a third adhesive film layer, and the third adhesive film layer is arranged between the first PVDF layer and the battery unit; and / or The second encapsulation layer includes a second PVDF layer and a fourth adhesive film layer, and the fourth adhesive film layer is arranged between the second PVDF layer and the battery unit.

12. A double-sided photovoltaic module, characterized in that: The double-sided photovoltaic module is prepared by the preparation method of any one of claims 1 to 11.

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