CN118136737A - Back contact solar cell and coating method thereof - Google Patents
Back contact solar cell and coating method thereof Download PDFInfo
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- CN118136737A CN118136737A CN202410463045.6A CN202410463045A CN118136737A CN 118136737 A CN118136737 A CN 118136737A CN 202410463045 A CN202410463045 A CN 202410463045A CN 118136737 A CN118136737 A CN 118136737A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F71/00—Manufacture or treatment of devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/90—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers
- H10F19/902—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells
- H10F19/908—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells for back-contact photovoltaic cells
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Abstract
本发明提供了一种背接触太阳能电池及其覆膜方法，其中覆膜方法包括：按序放置组成背接触太阳能电池的各电池片，并将焊带按照连接各电池片所处位置放置在各电池片上，其中背接触太阳能电池包括若干组电池串，每一组电池串包括若干电池片；在焊带上施加一层第一胶膜，且第一胶膜覆盖住所述各电池片间隙的所有焊带，第一胶膜为背接触太阳能电池背面覆盖的胶膜；加热融化第一胶膜，使焊带固定在各电池片上。本发明中覆膜方法能够有效减少制备背接触太阳能电池过程中覆膜工序，提高电池的生产效率、降低成本。
The present invention provides a back-contact solar cell and a coating method thereof, wherein the coating method comprises: placing the cells constituting the back-contact solar cell in order, and placing the welding strips on the cells according to the positions where the cells are connected, wherein the back-contact solar cell comprises a plurality of groups of cell strings, and each group of cell strings comprises a plurality of cells; applying a layer of first adhesive film on the welding strips, and the first adhesive film covers all welding strips in the gaps between the cells, and the first adhesive film is the adhesive film covering the back of the back-contact solar cell; heating and melting the first adhesive film, so that the welding strips are fixed on the cells. The coating method of the present invention can effectively reduce the coating process in the process of preparing the back-contact solar cell, improve the production efficiency of the battery, and reduce the cost.
Description
Technical Field
The invention mainly relates to the technical field of solar cells, in particular to a back contact solar cell and a film coating method thereof.
Background
A solar cell, also called a solar chip or a photovoltaic cell, can output a voltage instantaneously and generate a current in the presence of a loop whenever it is irradiated with light satisfying a certain illuminance condition. Physically, this process is called solar Photovoltaic (Photovoltaic), simply Photovoltaic. The main principle of solar cells is the photovoltaic effect or the photochemical effect, by means of which it is possible to convert light energy directly into electrical energy.
Back contact solar cells (BC cells) are a special solar cell design that is mainly characterized by the metal contact points of the cells being located on the back side of the cell instead of on the front surface of the conventional design. This design helps to reduce shadow masking of the front surface and improve the photoelectric conversion efficiency of the battery. The back contact solar cell has many advantages, such as higher photoelectric conversion efficiency, lower temperature coefficient, better weak light response and the like, which lead the back contact solar cell to have wide application prospect in the photovoltaic field. With the continuous progress of technology and the reduction of cost, the back contact solar cell is expected to be widely applied in the future.
The front surface of the back contact solar cell is completely free of grid line shielding, so that the back contact solar cell has higher cell efficiency, the appearance of the assembly is more attractive, the back contact solar cell plays an important role in the photovoltaic development process in recent years, and the main grid-free technology is an important direction in the future back contact solar cell cost reduction development process. The film-coating connection method can be applied to a main-grid-free connection scheme and a low-temperature connection scheme, wherein a welding strip is pre-fixed on a battery piece through a heating adhesive film, and final electric connection is completed during lamination. During conventional laminating operation, a layer of thin film is firstly used for fixing the welding belt, and then the film is laid for lamination, so that the operation steps are increased, the use of the film is increased, and the production cost is increased.
In general, the existing film laminating process adopts a film with a thin thickness for pre-fixing, and then a layer of film is laid and laminated to prepare the assembly, and the film on the battery string consists of a plurality of mutually independent block films, so that the film laminating film has high preparation cost; in addition, the laying of the double-layer adhesive film can not only increase the operation procedure, but also increase the production cost.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the back contact solar cell and the film coating method thereof, so that the film coating process in the process of preparing the back contact solar cell is effectively reduced, the production efficiency of the cell is improved, and the cost is reduced.
In order to solve the technical problem, in a first aspect, the present invention provides a film coating method for a back contact solar cell, including: each cell piece forming the back contact solar cell is placed in sequence, and a welding strip is placed on each cell piece according to the position where the cell pieces are connected; wherein the back contact solar cell comprises a plurality of groups of cell strings, each group of cell strings comprising a plurality of cell sheets; applying a layer of first adhesive film on the welding strips, wherein the first adhesive film covers all the welding strips in the gaps of each battery piece, and the first adhesive film is an adhesive film covered on the back of the back contact solar cell; and heating and melting the first adhesive film to fix the welding strip on each battery piece.
Optionally, the thickness of the first adhesive film is 0.1 mm-2 mm.
Optionally, the length L1 of the first adhesive film satisfies the following relationship: 0.9L0 is less than or equal to L1 is less than or equal to 1.1L0, wherein L0 is the distance between the outer side edges of the cell pieces at two ends of the back contact solar cell in the length direction; the width W1 of the first adhesive film satisfies the following relationship: 0.8W0 is less than or equal to W1 is less than or equal to 1.2W0, wherein W0 is the distance between the outer side edges of the cell pieces at two ends of the back contact solar cell in the width direction.
Optionally, the method further comprises: and adding a second adhesive film at a spacing position between the outer edge of the outermost battery piece of the back contact solar battery and the glass or the back plate, wherein the second adhesive film is a supplementary adhesive film at the outer edge of the battery piece.
Optionally, the thickness of the second adhesive film is 0.1 mm-2 mm, and the width is 5 mm-20 mm.
Optionally, a third adhesive film is added in the gaps among the battery strings to supplement the adhesive film lacking among the battery strings, wherein the third adhesive film is a supplementary adhesive film for the gaps among the battery strings.
Optionally, the third adhesive film is an adhesive film strip.
Optionally, the second adhesive film and the third adhesive film are formed independently or integrally.
Optionally, the method further comprises: and a fourth adhesive film is added between each battery piece and a supporting platform for placing each battery piece, wherein the fourth adhesive film is an adhesive film covered on the front surface of the back contact solar cell.
Optionally, the thickness of the fourth adhesive film is 0.1 mm-2 mm.
Optionally, the length L2 of the fourth adhesive film satisfies the following relationship: 0.8L0-L2-1.2L0, wherein L0 is the distance between the outer edges of the cell pieces at two ends of the back contact solar cell in the length direction; the width W2 of the fourth adhesive film satisfies the following relationship: 0.8W0-W2-1.2W0, wherein W0 is the distance between the outer edges of the cell pieces at two ends of the back contact solar cell in the width direction.
Optionally, the lengths and/or widths and/or thicknesses of the first adhesive film and the fourth adhesive film are the same.
Optionally, the first adhesive film, the second adhesive film, the third adhesive film and the fourth adhesive film are one of the following adhesive films: POE transparent adhesive film, EVA transparent adhesive film and colored adhesive film.
In a second aspect, the present invention provides a back contact solar cell comprising: each layer is sequentially provided with front glass, a fourth adhesive film, arranged battery pieces, welding strips, a first adhesive film and a back plate, and the adhesive film in the back contact solar battery is prepared by adopting the film coating method of the back contact solar battery in the first aspect.
Compared with the prior art, the invention has the following advantages: when the film is coated, firstly, each battery piece forming the back contact solar battery is placed in sequence, and the welding strip is placed on each battery piece according to the position where each battery piece is connected, wherein the back contact solar battery comprises a plurality of battery strings, each battery string comprises a plurality of battery pieces, a layer of first adhesive film is applied on the welding strip, the first adhesive film covers all the welding strips in the gaps of each battery piece, the first adhesive film is the adhesive film covered on the back surface of the back contact solar battery, and finally, the first adhesive film is heated and melted, so that the welding strips are fixed on each battery piece, the film coating process in the process of preparing the back contact solar battery can be effectively reduced, the production efficiency of the battery is improved, and the cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the accompanying drawings:
FIG. 1 is a schematic illustration of a primary coating in a conventional coating of a back contact solar cell;
FIG. 2 is a schematic illustration of a secondary coating in a conventional coating of a back contact solar cell;
FIG. 3 is a schematic diagram of a stack after conventional lamination of a back contact solar cell;
FIG. 4 is a schematic flow chart of a film coating method of a back contact solar cell according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a laminate after a lamination process according to an embodiment of the present invention;
FIG. 6 is a schematic top view of a film coating method according to an embodiment of the present invention;
FIG. 7 is a schematic view of an edge coating according to an embodiment of the invention;
FIG. 8 is a schematic view of a glass or back plate according to one embodiment of the invention;
FIG. 9 is a schematic diagram of a third adhesive film according to an embodiment of the invention;
FIG. 10 is a schematic view showing the effect of the second and third films integrally formed according to an embodiment of the present invention;
FIG. 11 is a schematic diagram showing the effect of adding a fourth adhesive film according to an embodiment of the invention;
Fig. 12 is a schematic structural view of a back contact solar cell according to an embodiment of the present invention.
The reference numerals are respectively:
100-cell pieces;
200-welding the tape;
310-primary adhesive film and 320-secondary adhesive film;
410-a first adhesive film, 420-a second adhesive film, 430-a third adhesive film and 440-a fourth adhesive film;
510-glass, 520-back plate;
600-supporting platform.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is apparent to those of ordinary skill in the art that the present application may be applied to other similar situations according to the drawings without inventive effort. Unless otherwise apparent from the context of the language or otherwise specified, like reference numerals in the figures refer to like structures or operations.
As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application is understood, not simply by the actual terms used but by the meaning of each term lying within.
A flowchart is used in the present application to describe the operations performed by a system according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in order precisely. Rather, the various steps may be processed in reverse order or simultaneously. At the same time, other operations are added to or removed from these processes.
Referring to fig. 1 to 3, in a conventional back contact solar cell lamination method, a battery sheet 100 is placed on a support platform 600 during a lamination operation, then a solder strip 200 is placed on the battery sheet 100 according to a certain position, a glue film is applied over the solder strip 200, and then the glue film is melted by heating, so that the bonding between the solder strip 200 and the battery sheet 100 is completed, and the solder strip 200 is pre-fixed on the battery sheet 100. In this lamination process, the adhesive film above the solder tape 200 needs to be applied twice, once by first coating a thinner adhesive film (primary adhesive film 310) with a size comparable to that of the battery cell 100, and then coating a second adhesive film (secondary adhesive film 320). In this lamination mode, there is no adhesive film at the portion between the battery plates 100, as shown at a in fig. 1 and 3, and the thickness of the primary adhesive film 310 is lower than that of the laminated adhesive film required in the actual production process, so that the entire secondary adhesive film 320 needs to be reused to cover the battery plates 100 in the lamination process of the subsequent assembly. The two layers of adhesive films are required to be laid above the side, with the welding strip 200, of the final battery piece 100, and the double-layer adhesive film design can increase the manufacturing cost of the assembly and reduce the production efficiency of the assembly.
Example 1
Fig. 4 is a schematic flow chart of a film coating method of a back contact solar cell according to an embodiment of the invention, and referring to fig. 4, a method 400 includes: s410, sequentially placing all the battery pieces forming the back contact solar battery, and placing a welding strip on each battery piece according to the position where the battery pieces are connected; wherein the back contact solar cell comprises a plurality of groups of cell strings, each group of cell strings comprising a plurality of cell sheets; s420, applying a layer of first adhesive film on the welding strips, wherein the first adhesive film covers all the welding strips in the gaps of each battery piece, and the first adhesive film is the adhesive film covered on the back surface of the back contact solar cell; s430, heating and melting the first adhesive film to fix the welding strip on each battery piece.
In this embodiment, unlike the conventional film laminating method, the film laminating method is simplified, and when the battery piece 100 and the welding strip 200 are in place, only one film (the first adhesive film 410) is required to be directly coated on the welding strip 200 and the whole area where the battery piece 100 is located, and the film laminating process is not required to be step by step, so that the film laminating process is simplified, and the production efficiency of the battery is improved. When the film is coated, the thin films of the battery plates 100 which are mutually independent are changed into the whole thick film, so that the cost is reduced. The method of the embodiment also omits the laying of the whole adhesive film layer and the strip adhesive film, and reduces the production time of the assembly.
After the film is coated by adopting the method of the embodiment, the gap A generated in the traditional two-time film coating process is eliminated. Referring to fig. 5, a whole layer of first adhesive film 410 is directly disposed above the solder strip 200, and the first adhesive film 410 is also covered at the position between the battery pieces 100, and the adhesive film is melted by heating to fix the solder strip 200, so that the gap a generated in the conventional film covering method is not present.
Further, although the embodiment performs the film coating process on the solder tape 200 only once, the type of the adhesive film is not limited, and the first adhesive film 410 may be a single type of adhesive film or a composite type of adhesive film, so as to meet the use requirements of different adhesive films.
In one example, the thickness of the first adhesive film 410 is 0.1 mm-2 mm.
In one example, the length L1 of the first adhesive film 410 satisfies the following relationship: 0.9L0.ltoreq.L1.ltoreq. 1.1L0, wherein L0 is the distance between the outer edges of the cell sheets 100 at both ends of the back contact solar cell in the length direction. The width W1 of the first adhesive film 410 satisfies the following relationship: 0.8W0.ltoreq.W1.ltoreq. 1.2W0, wherein W0 is the distance between the outer edges of the cell sheets 100 at both ends of the back contact solar cell in the width direction.
Fig. 6 is a schematic top view of a film coating method according to an embodiment of the present invention, and referring to fig. 6, if the horizontal direction is the length direction and the vertical direction is the width direction. At this time, the back contact solar cell has two ends in the length direction, the outer edges of the cell sheets 100 are E3 at the left side and E4 at the right side, so L0 is the distance between E3 and E4, and the length L1 of the first adhesive film 410 satisfying 0.9L0.ltoreq.L1.ltoreq. 1.1L0 indicates that the length of the first adhesive film 410 may be shorter than the length L0, the lowest 0.9L0, the longer than the length L0, and the longest 1.1L0. The outer edges of the cell sheets 100 at both ends of the back contact solar cell in the width direction have the upper edge of E1 and the lower edge of E2, so that W0 is the distance between E1 and E2, and the width W1 of the first adhesive film 410 satisfying 0.8W0.ltoreq.w1.ltoreq. 1.2W0 indicates that the width of the first adhesive film 410 may be narrower than the width W0, the lowest 0.8W0, the longer than the width W0, and the widest 1.2W0.
In an example, a second adhesive film 420 is added at a spaced position between the outer edge of the outermost cell sheet 100 of the back contact solar cell and the glass 510 or the back plate 520, and the second adhesive film 420 is a supplementary adhesive film of the outer edge of the cell sheet 100.
In this embodiment, in the subsequent lamination process of the back contact solar cell, there is no need to add a whole adhesive film layer on the solder strip surface of the cell 100, and meanwhile, the adhesive film at the interval position between the cell 100 can flow from the first adhesive film 410 to the position in the lamination process to complete the filling of the adhesive film. However, when the film is not sufficiently filled, the film may be replenished here, so that at the time of actual lamination, the corresponding film may be added at a position spaced apart from the edge of the battery sheet 100 and the side of the glass 510 or the back plate 520, that is, the second film 420 may be added.
In one example, the second adhesive film 420 has a thickness of 0.1mm to 2mm and a width of 5mm to 20mm. The thickness of the second adhesive film 420 may be the same as that of the first adhesive film 410, and the width of the second adhesive film 420 mainly depends on the width of the interval between the outer edge of the outermost battery sheet 100 of the back contact solar cell and the glass 510 or the back plate 520, as shown with reference to fig. 8.
In an example, a third adhesive film 430 is added in the gaps between the battery strings to supplement the adhesive film lacking between the battery strings, and the third adhesive film 430 is a supplementary adhesive film for the gaps between the battery strings.
In this embodiment, the back contact solar cell includes several groups of cell strings, each group of cell strings includes several cell sheets 100, and referring to fig. 9, since the gaps between the cell strings are larger than the gaps between the cell sheets 100 of each group of cell strings, after the adhesive film melts the first adhesive film 410 by heating, the gaps between the cell strings may still be not filled, in which case, a third adhesive film 430 may be added in the gaps between the cell strings to supplement the adhesive film lacking between the cell strings. More preferably, since the gaps between the battery strings are generally elongated, the third adhesive film 430 may directly employ adhesive film strips matching the shapes of the gaps.
In an example, the second adhesive film 420 and the third adhesive film 430 are formed independently or integrally with each other.
Referring to fig. 9, the second adhesive film 420 (around the whole battery sheet assembly) as a supplementary adhesive film for the outer edge of the battery sheet 100 may be directly formed into a shape of a space between the outer edge of the outermost battery sheet 100 and the glass 510 or the back plate 520, and used alone. Similarly, the third adhesive film 430 (between two adjacent strings) may be directly formed into the shape of the space between the strings as a supplementary adhesive film between the strings, and used alone to fill the space.
Whether the glass 510 or the back plate 520 is used for the edge of the battery piece 100 or the battery string, the supplementary adhesive films (including the second adhesive film 420 and the third adhesive film 430) are all improved ways for solving the problem of adhesive shortage caused by the problem of adhesive film flowability or the problem of adhesive amount, and the second adhesive film 420 and the third adhesive film 430 can be integrally formed in the embodiment in comparison with the way that the second adhesive film 420 and the third adhesive film 430 are separately arranged. Referring to fig. 10, in this embodiment, the types of gaps or clearances are not distinguished, and the second adhesive film 420 and the third adhesive film 430 are used as the filling adhesive films, and can be integrally formed and used as a uniform filling adhesive film, so that the filling process is simplified.
In an example, in the film laminating method of the present embodiment, a layer of fourth adhesive film 440 may be added between each battery piece 100 and the supporting platform 600 on which each battery piece 100 is placed, where the fourth adhesive film 440 is an adhesive film covered by the front surface of the back contact solar cell.
Referring to fig. 11, when the method of the present embodiment is used for film coating, a film layer (fourth film 440) is added between the back-contact solar cell and the supporting platform 600, specifically, between the front surface of the battery piece 100 and the supporting platform 600, so as to reduce or eliminate the scratch of the supporting platform 600 on the battery piece 100. Further, when lamination is performed, the adhesive film composition of the front surface of the battery is the same as that of the back surface of the battery, and the back surface photovoltaic glass 510 or the back plate 520 is combined, so that the laying flow of the adhesive film can be completely omitted when lamination is performed, the production time is shortened, the use of the adhesive film is reduced, and the production cost is reduced.
In one example, the thickness of fourth adhesive film 440 is 0.1mm to 2mm. The thickness of the fourth adhesive film 440 may be the same as the thickness of the first adhesive film 410.
In one example, length L2 of fourth adhesive film 440 satisfies the following relationship: 0.8L0.ltoreq.L2.ltoreq. 1.2L0, wherein L0 is the distance between the outer edges of the cell sheets 100 at both ends of the back contact solar cell in the length direction. The width W2 of the fourth adhesive film 440 satisfies the following relationship: 0.8W0.ltoreq.W2.ltoreq. 1.2W0, wherein W0 is the distance between the outer edges of the cell sheets 100 at both ends of the back contact solar cell in the width direction.
In this embodiment, the length L2 of the fourth adhesive film 440 satisfying 0.8L0.ltoreq.L1.ltoreq. 1.2L0 indicates that the length of the fourth adhesive film 440 may be shorter than the length L0, the lowest length is 0.8L0, the longest length is 1.2L0, and the lowest length is longer than the length L0. A width W2 of fourth adhesive film 440 satisfying 0.8W0.ltoreq.W2.ltoreq. 1.2W0 indicates that the width of fourth adhesive film 440 may be narrower than width W0, at the lowest 0.8W0, or longer than width W0, at the highest 1.2W0.
In one example, the length and/or width and/or thickness of first adhesive film 410 and fourth adhesive film 440 are the same.
For example, if the lengths, widths and thicknesses of the first adhesive film 410 and the fourth adhesive film 440 are the same, the specifications of the first adhesive film 410 and the fourth adhesive film 440 are the same, so that the process of preparing or preparing the first adhesive film 410 and the fourth adhesive film 440 is simplified, and meanwhile, when the solar cell is coated, the first adhesive film 410 belonging to the back side and the fourth adhesive film 440 belonging to the front side do not need to be specially distinguished, so that the fault tolerance is higher, and the coating is more efficient.
In one example, the first adhesive film 410, the second adhesive film 420, the third adhesive film 430, and the fourth adhesive film 440 are one of the following adhesive films: POE (Polyolefin Elastomer ) clear film, EVA (ETHYLENE VINYL ACETATE, ethylene-vinyl acetate copolymer) clear film, and colored film. Illustratively, the first adhesive film 410, the second adhesive film 420, the third adhesive film 430, and the fourth adhesive film 440 are POE transparent adhesive films. The colored adhesive film can be a white adhesive film or a black adhesive film, or can be other colored adhesive films meeting the requirements, which are not listed here.
According to the film coating method for the back contact solar cell provided by the embodiment, firstly, the battery pieces 100 forming the back contact solar cell are placed in sequence, and the welding strips 200 are placed on the battery pieces 100 according to the positions where the battery pieces 100 are connected, wherein the back contact solar cell comprises a plurality of groups of battery strings, each group of battery strings comprises a plurality of battery pieces 100, a layer of first adhesive film 410 is applied on the welding strips, the first adhesive film 410 covers all the welding strips in the gaps of the battery pieces 100, the first adhesive film 410 is the adhesive film covered on the back surface of the back contact solar cell, and finally, the first adhesive film 410 is heated and melted, so that the adhesive film coating process in the process of preparing the back contact solar cell is effectively reduced, the production efficiency of the cell is improved, and the cost is reduced.
Example two
Fig. 12 is a schematic structural diagram of a back contact solar cell according to an embodiment of the present invention, and referring to fig. 12, the back contact solar cell of the present embodiment includes a glass 510, a fourth adhesive film 440, arranged battery pieces 100, a solder strip 200, a first adhesive film 410, and a back plate 520.
The back contact solar cell is characterized in that each layer of the back contact solar cell is sequentially arranged, the lowest layer (front surface) is glass 510, a fourth adhesive film 440 is arranged on the glass, each cell piece 100 is arranged on the fourth adhesive film 440 in sequence, a plurality of cell pieces 100 form a group of cell strings, and the solar cell comprises a plurality of groups of cell strings. Above the battery cells 100 are solder strips 200 connecting the battery cells 100, the solder strips 200 are covered with a first adhesive film 410, and the first adhesive film 410 has a back plate 520 (back surface).
In this embodiment, the adhesive film in the back contact solar cell is prepared by adopting the film coating method of the back contact solar cell as shown in the first embodiment, wherein the adhesive film includes the first adhesive film 410 and the fourth adhesive film 440, and may also include the second adhesive film 420 and the third adhesive film 430, so that the first adhesive film 410 can completely cover the solder strip 200 and the cell 100, and no gap generated by the film coating in the conventional film coating method exists, thereby improving the performance of the back contact solar cell.
While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.
Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.
It should be noted that in the foregoing description of one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure does not imply that the subject application requires more features than are set forth in the claims. Indeed, less than all of the features of a single embodiment disclosed above.
In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.
While the application has been described with reference to the specific embodiments presently, it will be appreciated by those skilled in the art that the foregoing embodiments are merely illustrative of the application, and various equivalent changes and substitutions may be made without departing from the spirit of the application, and therefore, all changes and modifications to the embodiments are intended to be within the scope of the appended claims.
Claims (14)
1. A method of coating a back contact solar cell, comprising:
Each cell piece forming the back contact solar cell is placed in sequence, and a welding strip is placed on each cell piece according to the position where the cell pieces are connected; wherein the back contact solar cell comprises a plurality of groups of cell strings, each group of cell strings comprising a plurality of cell sheets;
applying a layer of first adhesive film on the welding strips, wherein the first adhesive film covers all the welding strips in the gaps of each battery piece, and the first adhesive film is an adhesive film covered on the back of the back contact solar cell;
and heating and melting the first adhesive film to fix the welding strip on each battery piece.
2. The method of claim 1, wherein the thickness of the first adhesive film is 0.1mm to 2mm.
3. The method of claim 1, wherein the length L1 of the first adhesive film satisfies the following relationship: 0.9L0 is less than or equal to L1 is less than or equal to 1.1L0, wherein L0 is the distance between the outer side edges of the cell pieces at two ends of the back contact solar cell in the length direction; the width W1 of the first adhesive film satisfies the following relationship: 0.8W0 is less than or equal to W1 is less than or equal to 1.2W0, wherein W0 is the distance between the outer side edges of the cell pieces at two ends of the back contact solar cell in the width direction.
4. The method of coating a back contact solar cell of claim 1, further comprising:
And adding a second adhesive film at a spacing position between the outer edge of the outermost battery piece of the back contact solar battery and the glass or the back plate, wherein the second adhesive film is a supplementary adhesive film at the outer edge of the battery piece.
5. The method of coating a back contact solar cell of claim 4, wherein the second adhesive film has a thickness of 0.1mm to 2mm and a width of 5mm to 20mm.
6. The method of claim 4, wherein a third adhesive film is added in the gaps between the cell strings to supplement the adhesive film lacking between the cell strings, and the third adhesive film is a supplementary adhesive film for the gaps between the cell strings.
7. The method of claim 6, wherein the third adhesive film is an adhesive film strip.
8. The method of claim 6, wherein the second adhesive film and the third adhesive film are formed independently or integrally.
9. The method of coating a back contact solar cell of claim 6, further comprising:
And a fourth adhesive film is added between each battery piece and a supporting platform for placing each battery piece, wherein the fourth adhesive film is an adhesive film covered on the front surface of the back contact solar cell.
10. The method of claim 9, wherein the fourth adhesive film has a thickness of 0.1mm to 2mm.
11. The method of claim 9, wherein the length L2 of the fourth adhesive film satisfies the following relationship: 0.8L0-L2-1.2L0, wherein L0 is the distance between the outer edges of the cell pieces at two ends of the back contact solar cell in the length direction; the width W2 of the fourth adhesive film satisfies the following relationship: 0.8W0-W2-1.2W0, wherein W0 is the distance between the outer edges of the cell pieces at two ends of the back contact solar cell in the width direction.
12. The method of claim 9, wherein the first adhesive film and the fourth adhesive film are the same in length and/or width and/or thickness.
13. The film coating method of a back contact solar cell according to any one of claims 9 to 12, wherein the first adhesive film, the second adhesive film, the third adhesive film and the fourth adhesive film are one of the following adhesive films: POE transparent adhesive film, EVA transparent adhesive film and colored adhesive film.
14. A back contact solar cell, comprising:
Each layer is sequentially provided with front glass, a fourth adhesive film, arranged battery pieces, welding strips, a first adhesive film and a back plate, and the adhesive film in the back contact solar battery is prepared by adopting the film coating method of the back contact solar battery according to any one of claims 1-13.
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