Solar cell piece, stacking structure and solar cell module

Abstract

The utility model relates to the field of solar photovoltaic technology, in particular to a solar cell sheet, a stacking structure and a solar cell module. The solar cell piece comprises a cell piece body and an isolating membrane, and the isolating membrane is arranged on the front face of the cell piece body. And the isolating membrane is provided with a hollow structure. And the isolating membrane is arranged on the front surface of the battery piece body and can protect the front surface of the battery piece body. When a plurality of solar cell pieces are stacked, the isolating membrane can prevent the front surface of the cell piece body from being damaged by grid lines on the back surfaces of other solar cell pieces or other factors, so that the possibility that the front surface of the solar cell piece is damaged in the subsequent transfer and processing process is effectively reduced. And the isolating membrane is provided with a hollow structure, so that the cost can be reduced, and the photoelectric conversion efficiency of the solar cell can be properly maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaics, and in particular to a solar cell sheet, a stacking structure and a solar cell assembly. Background Art

[0002] BC solar cells (back contact solar cells) have both the PN junction and the grid line located on the back of the solar cell. The front of the cell uses silicon nitride or silicon oxide as a passivation layer. There is no metal electrode blocking it, which maximizes the use of incident light, reduces optical losses, and brings more effective power generation area. Back contact solar cells have high conversion efficiency and are more beautiful in appearance.

[0003] After the solar cells are prepared, they need to be transported and processed. For example, the solar cells are transported to the laminating equipment for the preparation of battery components. In order to avoid scratches between solar cells during transportation and processing, especially scratches on the front of the solar cells, when the solar cells are stacked, isolation paper is used to block the adjacent solar cells. This solution using isolation paper for isolation needs to be removed before lamination.

[0004] Obviously, the existing solar cells use a separation paper isolation solution, and the separation paper needs to be removed before lamination, which makes the operation more cumbersome; in addition, the debris dropped by the separation paper is easy to adhere to the surface of the solar cell, affecting the quality of the laminate. Utility Model Content

[0005] In view of this, the utility model proposes a solar cell, a stacking structure and a solar cell assembly, aiming to partially or completely solve the technical problems that the existing solar cells use isolation paper isolation solutions, the isolation paper needs to be removed before lamination, which makes the operation more cumbersome, and the debris of the isolation paper is easy to adhere to the surface of the solar cell, affecting the quality of the laminated parts. To achieve the above purpose, the technical solution of the utility model is implemented as follows:

[0006] In a first aspect, the utility model provides a solar cell, which comprises a cell body and an isolation film, wherein the isolation film is arranged on the front side of the cell body; the isolation film is provided with a hollow structure.

[0007] Optionally, the hollow structure is at least one of a rectangular structure, a square structure, a triangular structure, a circular structure, and a hexagonal structure; and / or the front side of the battery cell body is a light-receiving side.

[0008] Optionally, the hollow structures are arranged in an array on the isolation membrane; or, the hollow structures are arranged in a centrally symmetrical manner on the isolation membrane.

[0009] Optionally, the hollow structure includes a middle hollow structure and multiple peripheral hollow structures; the middle hollow structure is located in the middle of the isolation membrane; the peripheral hollow structure is an annular structure, and the sizes of the multiple peripheral hollow structures increase successively, and the multiple peripheral hollow structures are sequentially arranged on the outside of the middle hollow structure in order from small to large.

[0010] Optionally, the isolation film includes a plurality of first film lines and a plurality of second film lines; in a first direction, the plurality of first film lines are arranged in parallel and spaced apart; in a second direction, the plurality of second film lines are arranged in parallel and spaced apart; the first direction and the second direction intersect, and the plurality of first film lines and the plurality of second film lines have a plurality of connection points.

[0011] Optionally, under normal temperature conditions, the isolation film is a solid component; under high temperature conditions, the isolation film is pyrolyzed and vaporized; wherein the high temperature condition is at least one of a drying and curing process and a string welding process in subsequent processing of the solar cell.

[0012] Optionally, the melting point temperature of the isolation membrane is greater than or equal to 70°C and less than or equal to 130°C; and the boiling point temperature of the isolation membrane is greater than or equal to 170°C and less than or equal to 340°C; or, the melting point temperature of the isolation membrane is greater than or equal to 130°C and less than or equal to 160°C.

[0013] Optionally, the solar cell is a back-contact solar cell; and / or the material of the isolation film includes at least one of polyvinyl alcohol, ethylene-vinyl acetate copolymer, and polyolefin elastomer; and / or the isolation film includes film lines, which are used to form the hollow structure, and the width of the thinnest part of the film line is in the range of 1mm-20mm; and / or the thickness of the isolation film is in the range of 20um-150um.

[0014] In a second aspect, the utility model provides a stacking structure of solar cells, comprising a plurality of solar cells, wherein the solar cells are any of the solar cells described above, and the solar cells include grid lines, wherein the grid lines are arranged on the back of the cell body,

[0015] One solar cell is stacked on the other solar cell, the grid lines of one solar cell are supported on the isolation film of the other solar cell, the cell body of the other solar cell is arranged horizontally, and the angle between the upper surface of the cell body of one solar cell and the horizontal plane is in the range of 0 degrees to 3 degrees;

[0016] Alternatively, the solar cell further comprises insulating glue, which is disposed on the back of the cell body and at least partially covers the grid line; one solar cell is stacked on another solar cell, the insulating glue of one solar cell is supported on the isolation film of the other solar cell, and the angle between the upper surface of the cell body of one solar cell and the horizontal plane is in the range of 0 degrees to 5 degrees.

[0017] In a third aspect, the utility model provides a solar cell assembly, wherein the solar cell is any one of the solar cells described above.

[0018] Optionally, the solar cell assembly further comprises a cover plate, a back plate, and an adhesive film, the solar cell sheet is encapsulated between the cover plate and the back plate by the adhesive film, and the hollow structure is at least partially cross-linked with the adhesive film after a lamination process.

[0019] The utility model discloses a solar cell, which can be a back contact cell, and an isolation film is arranged on the front of the cell body, and the isolation film can protect the front of the cell body. During the transfer and processing of the solar cell, when multiple solar cells are stacked, the isolation film can prevent the front of the cell body from being damaged by grid lines or other factors on the back of other solar cells, and effectively reduce the possibility of front damage to the solar cell during subsequent transfer and processing. A hollow structure is arranged on the isolation film, and the hollow structure can reduce costs and appropriately maintain the photoelectric conversion efficiency of the solar cell.

[0020] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below.

[0022] Figure 1 This is a schematic diagram of the structure of a solar cell according to an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of four stacked solar cells according to an embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a top view of a solar cell according to the first embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of a top view of a solar cell according to a second embodiment of the utility model;

[0026] Figure 5 This is a schematic structural diagram of a top view of a solar cell according to a third embodiment of the present utility model;

[0027] Figure 6 This is a schematic structural diagram of a top view of a solar cell according to a fourth embodiment of the present utility model;

[0028] Figure 7 for Figure 3 A structural diagram of the enlarged view of part A;

[0029] Figure 8 This is a schematic diagram of the stacking process of two solar cells according to an embodiment of the present utility model;

[0030] Fig. 9 It is a schematic diagram of the angle between the solar cell sheet and the horizontal plane described in the embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 10 - battery cell body; 20 - isolation film; 21 - hollow structure; 22 - first film line; 23 - second film line; 24 - film line; 30 - grid line. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0034] Reference Figure 1 , which shows a schematic structural diagram of a solar cell provided by an embodiment of the utility model, the solar cell comprises a cell body 10 and an isolation film 20, the isolation film 20 is arranged on the front side of the cell body 10; a hollow structure 21 is provided on the isolation film 20.

[0035] Further references Figure 1 As shown, an isolation film 20 is disposed on the front side of the cell body 10, and a gate line 30 is disposed on the back side of the cell body 10. The front side of the cell body 10 is a light-receiving side, and the back side of the cell body 10 is a backlight side.

[0036] In the solar cell of the embodiment of the present application, the solar cell may be a back contact solar cell, and the isolation film 20 is disposed on the front side of the cell body 10, and the isolation film 20 may protect the front side of the cell body 10. Figure 2 As shown, when multiple solar cells are stacked, the isolation film can prevent the front side of the cell body 10 from being damaged by the grid lines 30 on the back side of other solar cells or other factors, effectively reducing the possibility of front side damage of the solar cells during subsequent transfer and processing.

[0037] In the embodiment of the present application, the front side of the cell body 10 is the light-receiving side, and the isolation film 20 in the solar cell is provided with a hollow structure 21. The hollow structure 21 can reduce costs, reduce light blocking, and appropriately maintain the photoelectric conversion efficiency of the solar cell.

[0038] Optionally, the embodiment of the present application does not specifically limit the manner in which the isolation film 20 is disposed on the battery cell body 10. For example, the isolation film 20 is plated on the front side of the battery cell body 10; for another example, the isolation film 20 is pasted on the front side of the battery cell body 10; for another example, the isolation film 20 is printed on the front side of the battery cell body 10. In some embodiments, the isolation film 20 may also be disposed on the back side of the battery cell body 10, which is the side not exposed to light.

[0039] Optionally, the hollow structure 21 is in the form of a rectangular structure, a square structure, a triangular structure, a hexagonal structure, or at least one of a circular structure. Figure 3 and Figure 4 , both show structural schematic diagrams in which the hollow structure 21 is a square structure.

[0040] Furthermore, in one embodiment of the present application, the hollow structures 21 are arranged in an array on the isolation film 20. For example, referring to Figure 3 and Figure 4 As shown, the hollow structure 21 is a square structure, and the isolation membrane 20 forms a grid structure after the square structure array is arranged. For another example, the hollow structure 21 is a hexagonal structure, and the isolation membrane 20 forms a honeycomb structure after the hexagonal structure array is arranged.

[0041] The hollow structures 21 are arranged in an array on the isolation film 20 . The arrangement positions of the hollow structures 21 are relatively regular, which can prevent local friction and scratching of the solar cell.

[0042] Optional, see Figure 3 and Figure 4As shown, the isolation film 20 includes a plurality of first film lines 22 and a plurality of second film lines 23; in the first direction, the plurality of first film lines 22 are arranged in parallel and spaced apart; in the second direction, the plurality of second film lines 23 are arranged in parallel and spaced apart; the first direction and the second direction intersect, and the plurality of first film lines 22 and the plurality of second film lines 23 have a plurality of connection points.

[0043] At this time, in a specific embodiment, refer to Figure 3 As shown, a solar cell is placed on another solar cell in the horizontal direction, the first film line 22 is perpendicular to the grid line 30, and the first film line 22 can be used to support the grid line 30, so that one solar cell is supported by the first film line 22, and one solar cell is higher than the cell body 10 of another solar cell. When a solar cell is placed on another solar cell in the longitudinal direction, the second film line 23 is perpendicular to the grid line 30, and the second film line 23 can be used to support the grid line 30, so that one solar cell is supported by the second film line 23, and one solar cell can be higher than the cell body 10 of another solar cell. The first film line 22 and the second film line 23 are arranged in a vertical relationship, and all the first film lines 22 and the second film lines 23 are connected to each other, so that the solar cell placed horizontally and vertically can make one solar cell higher than the cell body 10 of another solar cell, and can prevent the front of the cell body 10 from being scratched.

[0044] Optionally, when the first direction is perpendicular to the second direction, the first film lines 22 and the second film lines 23 are perpendicular to each other. A plurality of first film lines 22 and a plurality of second film lines 23 are connected and enclosed to form a hollow structure 21, and the hollow structure 21 is at least one of a rectangular structure and a square structure.

[0045] In a specific embodiment, further referring to Figure 3 As shown, the first film line 22 is arranged along the transverse direction, and the second film line 23 is arranged along the longitudinal direction. Figure 4 As shown, the first film line 22 and the second film line 23 respectively have an angle with the transverse direction.

[0046] Optional, see Figure 5 and Figure 6 As shown, in another embodiment of the present application, the hollow structure 21 is centrally symmetrically arranged on the isolation film 20. In this case, the back of the solar cell can be supported and blocked in a symmetrical area or position at the same time, so as to prevent friction and scratching of the solar cell locally and avoid friction between adjacent solar cells.

[0047] Optional, see Figure 5 and Figure 6As shown, the hollow structure 21 includes a middle hollow structure and multiple peripheral hollow structures 21; the middle hollow structure is located in the middle of the isolation membrane 20; the peripheral hollow structure 21 is an annular structure, and the sizes of the multiple peripheral hollow structures 21 increase successively, and the multiple peripheral hollow structures 21 are sequentially arranged on the outside of the middle hollow structure 21 in order from small to large.

[0048] The above structure of the isolation film 20 can use less isolation film 20 material, lower the cost of solar cells, and make it easier for the isolation film 20 to be dried, cured and thermally decomposed at the component end; and can appropriately reduce the number of contact points between the first film line 22, the second film line 23 and the gate line 30.

[0049] The above-mentioned structure of the isolation film 20 can also make the back side of the solar cell be supported and blocked in a symmetrical area or position at the same time, so as to avoid friction between adjacent solar cells; an annular film line 24 is formed between two adjacent peripheral hollow structures 21, and the annular film line 24 can provide a larger and continuous isolation contact area under certain circumstances, so that the front side and the back side of the solar cell have a more stable isolation effect.

[0050] Optionally, the peripheral hollow structure 21 is at least one of a rectangular structure, a square structure, a triangular structure, a hexagonal structure, and a circular structure. Figure 5 and Figure 6 , both show schematic diagrams of structures in which the peripheral hollow structure 21 is a square structure.

[0051] Optionally, under normal temperature conditions, the isolation film 20 is a solid component; under high temperature conditions, the isolation film 20 is pyrolyzed and vaporized; wherein the high temperature condition is at least one of a drying and curing process and a string welding process in subsequent processing of the solar cell.

[0052] At this time, the isolation film 20 has a certain stability at room temperature, so that the isolation film 20 is prevented from being in a molten flow state at room temperature. The isolation film 20 can play an isolating role and prevent damage to the front of the cell body 10. In the subsequent processing of the solar cell, such as at least one of the drying and curing process and the string welding process, the solar cell will be in a high temperature state; the isolation film 20 is pyrolyzed and vaporized at high temperature, and the isolation film 20 does not need to be removed separately, and the subsequent transfer and processing of the solar cell is simpler, which can effectively reduce the manufacturing cost of the solar cell module.

[0053] Optionally, the melting point of the isolation film 20 is greater than or equal to 70° C. and less than or equal to 130° C.; and the boiling point of the isolation film 20 is greater than or equal to 170° C. and less than or equal to 340° C.

[0054] When the melting point temperature and boiling point temperature of the isolation film 20 of the solar cell of the embodiment of the present application are within the above range, the isolation film 20 has a certain stability in a normal temperature environment, avoiding the isolation film 20 being in a molten flow state in a normal temperature environment; and the isolation film 20 of the solar cell will be pyrolyzed in the subsequent component manufacturing end, and the isolation film 20 does not need to be removed separately, and the subsequent transfer and processing process of the solar cell is simpler, which can effectively reduce the manufacturing cost of the solar cell component.

[0055] It is understandable that the melting point temperature of the isolation film 20 is selected according to the specific use requirements. For example, the melting point temperature of the isolation film 20 is any value of 70°C, 80°C, 90°C, 100°C, 105°C, 110°C, 120°C, and 130°C. The boiling point temperature of the isolation film 20 is any value of 170°C, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 250°C, 270°C, 290°C, 300°C, 310°C, 320°C, 330°C, and 340°C.

[0056] Optionally, at room temperature, the isolation film 20 is a solid component; during the lamination process in the subsequent processing of the solar cell, the isolation film 20 is cross-linked with the adhesive film. At this time, the isolation film 20 has a certain stability at room temperature, so that the isolation film 20 is prevented from being in a molten flow state at room temperature. The isolation film 20 can play an isolating role and prevent damage to the front of the cell body 10. During the lamination process in the subsequent processing of the solar cell, the isolation film 20 will melt and cross-link with the adhesive film; therefore, the isolation film 20 does not need to be removed separately, and the subsequent transfer and processing of the solar cell is simpler, which can effectively reduce the manufacturing cost of the solar cell module.

[0057] Optionally, in another embodiment of the present application, the melting point temperature of the isolation film 20 is greater than or equal to 130° C. and less than or equal to 160° C.

[0058] It is understandable that the melting point temperature of the isolation film 20 is selected according to specific usage requirements. For example, the melting point temperature of the isolation film 20 is any value among 130°C, 135°C, 140°C, 145°C, 148°C, 150°C, 155°C, and 160°C.

[0059] Specifically, in order to maintain the isolation stability of the isolation film 20 and avoid random changes in its shape, the melting point of the material used should generally not be lower than 70°C, so as to avoid the isolation film 20 being in a molten flow state at room temperature. In addition, in order to avoid deformation or damage to the battery cell body 10 due to excessive heating temperature in the subsequent lamination process, the melting point should generally not be higher than 300°C.

[0060] The embodiment of the present application does not specifically limit the material of the isolation film 20. For example, the isolation film 20 is a polyvinyl alcohol (PVA) film, and the boiling point of PVA is about 180°C. A layer of PVA film is provided on the cell body 10, and the PVA film is solid at room temperature; after the insulating glue and / or gray glue are coated on the component end, there is a drying and curing stage at the component end, and the drying and curing temperature can be 180°C-340°C. During this stage, the PVA film will be pyrolyzed, and the isolation film 20 does not need to be removed. The subsequent transfer and processing of the solar cell is simpler, which can effectively reduce the manufacturing cost of the solar cell module. After the pyrolysis of the PVA film, it may leave traces or no traces on the cell body 10. The traces left on the cell body 10 can be used as the front mark of the cell body 10.

[0061] The material of the isolation film 20 is not specifically limited in the embodiment of the present application. For example, the material of the isolation film 20 may also be ethylene-vinyl acetate copolymer (EVA) or polyolefin elastomer (POE). A layer of EVA isolation film or POE isolation film is arranged on the front of the battery cell body 10; when the EVA isolation film or POE isolation film is in a room temperature environment, its solid state is relatively stable, and the EVA isolation film or POE isolation film can play a good isolation role. The EVA isolation film or POE isolation film does not need to be removed. When the components are laminated, the EVA isolation film or POE isolation film can be directly laminated and cross-linked with the adhesive film for component encapsulation, thereby avoiding waste of the isolation film 20, reducing the amount of adhesive film, and saving lamination costs. The isolation film 20 is consistent with the adhesive film, and can be well matched with the subsequent production of solar cell components, that is, it can be well integrated with the adhesive film during the subsequent lamination process, and the subsequent transfer and processing process of the solar cell is simpler, which can effectively reduce the manufacturing cost of forming a solar cell component.

[0062] In the embodiment of the present application, the isolation film 20 has relatively stable physical and chemical properties at room temperature and is not prone to produce debris or residues like isolation paper, which also helps to improve the quality of the laminate.

[0063] It is understandable that the material of the isolation film 20 can be selected according to the use requirements, for example, at least one of polyvinyl alcohol, ethylene-vinyl acetate copolymer, and polyolefin elastomer can be selected.

[0064] Optionally, the isolation film 20 includes a film line 24, and the film line 24 can be used to form a hollow structure 21, referring to Figure 7As shown, the thinnest part of the film line 24 has a width of W, and the thinnest part has a width range of 1 mm to 20 mm. At this time, the film line 24 can play a good supporting and isolating role to prevent the grid line 30 on the back of the solar cell or other factors from damaging the front of the cell body 10.

[0065] It can be understood that the width of the thinnest part of the membrane line 24 is selected according to the specific usage requirements and the shape of the hollow structure 21. For example, the width of the thinnest part of the membrane line 24 is any value among 1mm, 3mm, 5mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, or a range of values ​​between two of them.

[0066] Optionally, the thickness of the isolation film 20 is in the range of 20 um to 150 um.

[0067] In the embodiment of the present application, when the thickness of the isolation film 20 is within the above range, the material of the isolation film 20 is less, which can save production costs, and the isolation film 20 is also easier to thermally decompose during the subsequent drying and curing of the component end.

[0068] Furthermore, in practical applications, the thickness of the isolation film 20 needs to be higher than the height of the main grid line or the insulating glue.

[0069] Specifically, when the solar cell is a back contact cell and the solar cell includes a main grid line, the thickness of the isolation film 20 is higher than the height of the main grid line. When the solar cell includes a thin grid line or insulating glue, the thickness of the isolation film 20 is higher than the height of the grid line or insulating glue.

[0070] It can be understood that the thickness range of the membrane line 24 is selected according to the specific usage requirements. For example, the thickness range of the membrane line 24 is any value among 20um, 40um, 50um, 60um, 80um, 100um, 120um, 140um, and 150um, or a range of values ​​between any two.

[0071] In the solar cell of the embodiment of the present application, the solar cell is a back contact cell, and the isolation film 20 is arranged on the front of the cell body 10, and the isolation film 20 can protect the front of the cell body 10. During the transfer and processing of the solar cell, when multiple solar cells are stacked, the isolation film 20 can prevent the front of the cell body 10 from being damaged by the grid lines 30 or other factors on the back of other solar cells, effectively reducing the possibility of front damage to the solar cell during subsequent transfer and processing. A hollow structure 21 is provided on the isolation film 20, which can reduce costs, reduce light blocking, and appropriately maintain the photoelectric conversion efficiency of the solar cell.

[0072] The isolation film 20 will be pyrolyzed in the subsequent production process, or the material used in the isolation film 20 can be consistent with the adhesive film, which can be well matched with the subsequent production of solar cell modules, that is, it can be well integrated with the adhesive film in the subsequent lamination process. Therefore, the isolation film 20 does not need to be removed, and the subsequent transfer and processing of the battery is simpler, which can effectively reduce the manufacturing cost of the solar cell module and solve the cost and photoelectric conversion rate problems of solar cells.

[0073] The present application also provides a stacking structure of solar cells, the stacking structure comprising a plurality of solar cells, the solar cells being any of the solar cells in the above embodiments, Figure 8 , which shows a schematic diagram of the stacking process of solar cells. The solar cell comprises a grid line 30 , which is arranged on the back of the cell body 10 .

[0074] A solar cell is stacked on another solar cell, the grid line 30 of one solar cell is supported by the isolation film 20 of the other solar cell, and the cell body 10 of the other solar cell is arranged horizontally. Fig. 9 As shown, the angle θ between the upper surface of the cell body 10 of a solar cell and the horizontal plane is in the range of 0 degrees to 3 degrees.

[0075] During the transfer process of solar cells, a large number of solar cells are usually stacked, for example, the number of solar cells stacked is 110 or 120. In the above structure of the embodiment of the present application, one solar cell is stacked on another solar cell, and the cell body 10 of the other solar cell is arranged horizontally. The angle between the upper surface of the cell body 10 of one solar cell and the horizontal plane is in the range of 0 degrees to 3 degrees, which is at least understood to include the endpoint values, and accordingly, it can be 0 degrees, 1 degree, 2 degrees, 3 degrees, etc., and one solar cell can be the topmost solar cell of the stacking structure, so as to avoid tilting of multiple solar cells after being stacked.

[0076] Further references Figure 8 As shown, the grid lines 30 on one solar cell are arranged in a direction that intersects with the grid lines 30 on another solar cell. Of course, the grid lines 30 on one solar cell can also be arranged in a parallel direction with the grid lines 30 on another solar cell.

[0077] Optionally, when the solar cell further comprises insulating glue, the insulating glue is disposed on the back of the cell body 10 and at least partially covers the grid line 30; one solar cell is stacked on another solar cell, and the insulating glue of one solar cell is supported on the isolation film 20 of the other solar cell, and further reference is made to Fig. 9As shown, the angle θ between the upper surface of the cell body 10 of a solar cell and the horizontal plane is in the range of 0 degrees to 5 degrees.

[0078] During the transfer process of solar cells, a large number of solar cells are usually stacked, for example, the number of solar cells stacked is 110 or 120. In the above structure of the embodiment of the present application, one solar cell is stacked on another solar cell, and the angle between the upper surface of the cell body 10 of one solar cell and the horizontal plane is in the range of 0 degrees to 5 degrees, which is at least understood to include the endpoint values, and accordingly, it can be 0 degrees, 1 degree, 2 degrees, 3 degrees, 4 degrees, 5 degrees, etc., and one solar cell can be the top solar cell of the stacking structure, so as to avoid tilting of multiple solar cells after being stacked.

[0079] The stacking structure of the solar cell of the embodiment of the present application is a back-contact solar cell, and the solar cell includes a cell body 10, an isolation film 20 and a grid line 30. The isolation film 20 is arranged on the front side of the cell body 10, and the grid line 30 is arranged on the back side of the cell body 10. The insulating glue is arranged on the back side of the cell body 10 and at least partially covers the grid line 30.

[0080] During the transfer process of solar cells, a large number of solar cells are usually stacked, that is, one solar cell is stacked on another solar cell. The isolation film 20 can prevent the front of the cell body 10 of another solar cell from being damaged by the grid line 30 or insulating glue of a solar cell, effectively reducing the possibility of front damage to the solar cell during the stacking process. Moreover, when a solar cell is stacked on another solar cell, the angle between the upper surface of the cell body 10 of a solar cell and the horizontal plane ranges from 0 degrees to 3 degrees or 0 degrees to 5 degrees, and a solar cell can be the top solar cell of the stacking structure. Of course, in the actual stacking process, the smaller the angle, the better, so as to avoid tilting of multiple solar cells after stacking, and ensure the stability of the stacking structure.

[0081] It should be noted that the plane where the center line of the battery cell and the long or short side of the end edge of the battery cell are located can be used as the upper surface, the center line can be parallel to the long or short side of the end edge of the battery cell, and the angle between the upper surface and the horizontal plane can be calculated as the size of the above-mentioned angle θ.

[0082] The embodiment of the present application further provides a solar cell assembly, wherein the solar cell is a solar cell as in any of the above embodiments.

[0083] The solar cell assembly of the embodiment of the present application includes a solar cell, on which an isolation film 20 is provided. During the process of stacking the solar cells for transfer and processing, the isolation film 20 can prevent the back grid lines 30 of the solar cells or other factors from damaging the front of the solar cells; the isolation film 20 can effectively reduce the possibility of surface damage between the solar cells during subsequent processing, thereby achieving the purpose of improving the appearance quality of the solar cell assembly made of the solar cells and ensuring the efficiency of the solar cell assembly.

[0084] Optionally, the solar cell assembly further includes a cover plate, a back plate, and an adhesive film. The solar cell sheet is encapsulated between the cover plate and the back plate by the adhesive film, and the hollow structure is at least partially cross-linked with the adhesive film after a lamination process.

[0085] Specifically, the cover plate and the back plate can at least be understood as glass. Solar cell modules usually undergo a conventional lamination process. During the lamination process, the isolation film 20 of the solar cell sheet is melted by heat and cross-linked with the adhesive film used for module encapsulation. The isolation film 20 becomes part of the adhesive film. There is no need to remove the isolation film 20 during the production process of the solar cell module, thereby simplifying the lamination operation process and helping to improve the lamination efficiency.

[0086] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0087] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the device, electronic device, computer-readable storage medium and computer program products containing instructions, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A solar cell, characterized in that: The solar cell comprises a cell body and an isolation film, wherein the isolation film is arranged on the front side of the cell body; and the isolation film is provided with a hollow structure.

2. The solar cell according to claim 1, characterized in that: The hollow structure is at least one of a rectangular structure, a square structure, a triangular structure, a circular structure, and a hexagonal structure; and / or the front side of the battery cell body is a light-receiving side.

3. The solar cell according to claim 1 or 2, characterized in that: The hollow structures are arranged in an array on the isolation membrane; or, the hollow structures are arranged in a centrally symmetrical manner on the isolation membrane.

4. The solar cell according to claim 1, characterized in that: The hollow structure includes a middle hollow structure and a plurality of peripheral hollow structures; the middle hollow structure is located in the middle of the isolation membrane; The peripheral hollow structure is an annular structure, and the sizes of the plurality of peripheral hollow structures are increased successively. The plurality of peripheral hollow structures are sequentially sleeved on the outside of the middle hollow structure in order of size from small to large.

5. The solar cell according to claim 1, characterized in that: The isolation film includes a plurality of first film lines and a plurality of second film lines; in a first direction, the plurality of first film lines are arranged in parallel and spaced apart; in a second direction, the plurality of second film lines are arranged in parallel and spaced apart; the first direction and the second direction intersect, and the plurality of first film lines and the plurality of second film lines have a plurality of connection points.

6. The solar cell according to claim 1, characterized in that: At room temperature, the isolation membrane is a solid component; Under high temperature conditions, the isolation film is pyrolyzed and vaporized; The high temperature condition is at least one of a drying and curing process and a string welding process in subsequent processing of the solar cell.

7. The solar cell according to claim 1, characterized in that: The melting point temperature of the isolation film is greater than or equal to 70° C. and less than or equal to 130° C.; and the boiling point temperature of the isolation film is greater than or equal to 170° C. and less than or equal to 340° C.; Alternatively, the melting point of the isolation film is greater than or equal to 130° C. and less than or equal to 160° C.

8. The solar cell according to claim 1, characterized in that: The solar cell is a back contact solar cell; and / or the material of the isolation film includes at least one of polyvinyl alcohol, ethylene-vinyl acetate copolymer, and polyolefin elastomer; And / or, the isolation film includes a film line, the film line is used to form the hollow structure, and the width of the thinnest part of the film line ranges from 1 mm to 20 mm; And / or, the thickness of the isolation film ranges from 20um to 150um.

9. A stacked structure of solar cells, comprising a plurality of solar cells, wherein the solar cells are the solar cells of any one of claims 1 to 8, and the solar cells include grid lines, wherein the grid lines are arranged on the back of the cell body, and wherein: One solar cell is stacked on the other solar cell, the grid lines of one solar cell are supported on the isolation film of the other solar cell, the cell body of the other solar cell is arranged horizontally, and the angle between the upper surface of the cell body of one solar cell and the horizontal plane is in the range of 0 degrees to 3 degrees; Alternatively, the solar cell further comprises insulating glue, which is disposed on the back of the cell body and at least partially covers the grid line; one solar cell is stacked on another solar cell, the insulating glue of one solar cell is supported on the isolation film of the other solar cell, and the angle between the upper surface of the cell body of one solar cell and the horizontal plane is in the range of 0 degrees to 5 degrees.

10. A solar cell module, characterized in that: The solar cell is the solar cell according to any one of claims 1 to 8.

11. The solar cell assembly according to claim 10, characterized in that: The solar cell assembly further comprises a cover plate, a back plate and an adhesive film. The solar cell sheet is encapsulated between the cover plate and the back plate by the adhesive film. The hollow structure is at least partially cross-linked with the adhesive film after a lamination process.

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