Fixed covering film, battery piece string and photovoltaic module

Abstract

The utility model discloses a fixed covering film, a battery piece string and a photovoltaic assembly, the battery piece string comprises a plurality of pre-gluing areas and a plurality of connecting areas, the plurality of pre-gluing areas and the plurality of connecting areas are alternately arranged, the pre-gluing areas are suitable for covering one side of a welding strip, which is deviated from a battery piece, and the connecting areas are suitable for being adhered with the battery piece. According to the fixing covering film provided by the utility model, through the adhesion of the connecting area and the battery piece, the fixing of the welding strip by the pre-gluing area can be well realized, so that the position of the welding strip on the battery piece is maintained, and the fixing covering film can avoid the risk that the packaging glue film wraps the welding strip to deviate in the laminating process, so that the risks of pseudo soldering and lap joint short circuit can be avoided; the welding stability of the welding strip and a battery piece is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially is fixed to cover film, cell piece string and photovoltaic module. BACKGROUND

[0002] With the development of the times, the importance of photovoltaic energy is more and more irreplaceable, under the impetus of market competition and technological progress, more and more photovoltaic enterprises pay great attention to the case of reducing cost and increasing efficiency, therefore, 0BB no main grid cell is derived.

[0003] Among them, 0BB is no main grid and no welding spot welding, greatly improves the difficulty of component end in string welding, such as welding effect is not good, after laminating will lead to welding strip deviation, false welding, lap short circuit and so on, directly affects the reliability of photovoltaic module, therefore, needs to be improved. UTILITY MODEL CONTENT

[0004] The utility model discloses a first aspect proposes a kind of fixed cover film, the fixed cover film has the advantage of stably keeping the position of welding strip on cell piece.

[0005] According to the fixed cover film of the first aspect embodiment of the utility model, it includes: multiple pre-gluing areas and multiple connecting areas, multiple pre-gluing areas and multiple connecting areas are alternately arranged, the pre-gluing area is suitable for covering on the side of welding strip deviating from cell piece, and the connecting area is suitable for being adhered with cell piece.

[0006] According to the fixed cover film of the first aspect embodiment of the utility model, by the adhesion of connecting area and cell piece, the fixation of pre-gluing area to welding strip can be better realized, to keep the position of welding strip on cell piece, and the fixed cover film can avoid the risk of encapsulation glue film entangling welding strip deviation in laminating process, so as to avoid the risk of false welding, lap short circuit, to improve the stability of welding strip and cell piece welding.

[0007] According to some embodiments of the utility model, the fixed cover film is a hot melt material piece.

[0008] According to some embodiments of the utility model, the fixed cover film is one of EVA piece, POE piece or EPE piece.

[0009] According to some embodiments of the utility model, the fixed cover film is photocuring film.

[0010] According to some embodiments of the utility model, the thickness range of the fixed cover film is 0.08-0.12mm.

[0011] The utility model discloses a second aspect proposes a kind of cell piece string.

[0012] A battery cell string according to a second aspect of the present invention includes: a plurality of battery cells; a plurality of welding ribbons, wherein the plurality of battery cells are connected by the plurality of welding ribbons, and the plurality of welding ribbons are arranged at intervals on the battery cells; and the aforementioned fixing film, wherein the fixing film is used to fix the plurality of welding ribbons to the battery cells.

[0013] According to the second aspect of this utility model, in a battery cell string, multiple solder ribbons are fixed to the battery cells by a fixing film, which can better maintain the position of the solder ribbons on the battery cells. Furthermore, when the battery cell string is used in a photovoltaic module, the fixing film avoids the risk of the solder ribbons shifting due to encapsulation film during lamination, thereby avoiding the risks of poor soldering and short circuits due to overlapping, thus improving the stability of the battery cell string. In addition, the fixing process for multiple solder ribbons can be simplified, thereby improving the production efficiency of the battery cell string.

[0014] According to some embodiments of the present invention, the number of pre-bonded areas of each of the fixed coatings is the same as the number of solder ribbons and they correspond one-to-one. Each of the pre-bonded areas defines a fixed space for fixing the solder ribbons with the battery cell. The outer periphery of the fixed space projected onto the reference plane is a closed ring. The reference plane is perpendicular to the extension direction of the solder ribbons. And / or, the number of fixed coatings is the same as the number of battery cells and they correspond one-to-one.

[0015] According to some embodiments of the present invention, the projection of the welding strip on the battery cell is a first projection, the projection of the fixing film on the battery cell is a second projection, and the first projection is located within the second projection; and / or, the thickness of the fixing film is less than the diameter of the welding strip.

[0016] The third aspect of this utility model proposes a photovoltaic module.

[0017] A photovoltaic module according to a third aspect of the present invention includes: the above-mentioned battery cell string; an encapsulating film, wherein the encapsulating film covers the outside of the battery cell string, the portion of the solder ribbon welded to the battery cell is a welded portion, and the fixing film is used to separate the welded portion from the encapsulating film.

[0018] According to the photovoltaic module of the third aspect of the present invention, the risk of solder ribbon displacement due to encapsulation film misalignment during the lamination process can be avoided by fixing the film, thereby avoiding the risk of poor soldering and short circuit due to overlapping, and improving the stability of the cell string.

[0019] According to some embodiments of this utility model, the fixing film and the encapsulating film are made of the same material.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Fig. 1 This is a schematic diagram of the fixed coating, welding ribbon, and battery cell according to an embodiment of the present utility model;

[0022] Fig. 2 This is a schematic diagram of a battery cell string according to an embodiment of the present utility model;

[0023] Fig. 3 This is a partial cross-sectional view of a photovoltaic module according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 100. Photovoltaic module; 10. Cell string; 1. Cell; 2. Solder ribbon; 3. Fixing film; 31. Pre-bonding area; 32. Connection area; 20. Encapsulating film; 30. Surface glass. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0028] The fixed coating 3 according to the first aspect of the present invention is described below with reference to the accompanying drawings.

[0029] like Figs. 1 to 3As shown, the fixing film 3 according to the first aspect of the present invention is used to fix the welding ribbon 2 to the battery cell 1. The fixing film 3 includes: a plurality of pre-bonding areas 31 and a plurality of connecting areas 32. The plurality of pre-bonding areas 31 and the plurality of connecting areas 32 are arranged alternately. The pre-bonding areas 31 are adapted to cover the side of the welding ribbon 2 away from the battery cell 1, and the connecting areas 32 are adapted to adhere to the battery cell 1.

[0030] In other words, two adjacent pre-bonding areas 31 are connected by a connecting area 32. Through the adhesion of the connecting area 32 to the cell 1, the pre-bonding area 31 can effectively fix the solder ribbon 2, thereby maintaining the position of the solder ribbon 2 on the cell 1. Furthermore, the fixing film 3 is set on the side of the solder ribbon 2 away from the cell 1. Therefore, when the cell 1 is applied in the photovoltaic module 100, during the lamination process, the connecting areas 32 on both sides of the pre-bonding area 31 can effectively maintain the position of the pre-bonding area 31. For example, when the pre-bonding area 31 is subjected to extrusion force towards one connecting area 32, the connecting area 32 on the other side can effectively hold the pre-bonding area 31 to prevent it from moving towards one connecting area 32 under the extrusion force, thereby effectively maintaining the position of the solder ribbon 2 on the cell 1. That is, fixing the coating 3 can avoid the risk of the encapsulating film 20 carrying away the solder ribbon 2 during the lamination process, thereby avoiding the risk of poor soldering and short circuit due to overlap, so as to improve the stability of the welding between the solder ribbon 2 and the battery cell 1.

[0031] According to the first aspect of the present invention, the fixing film 3 can effectively fix the solder ribbon 2 in the pre-bonding area 31 by bonding the connecting area 32 to the battery cell 1, so as to maintain the position of the solder ribbon 2 on the battery cell 1. In addition, the fixing film 3 can avoid the risk of the encapsulation film 20 carrying away the solder ribbon 2 during the lamination process, thereby avoiding the risk of poor soldering and short circuit due to overlapping, so as to improve the stability of the welding between the solder ribbon 2 and the battery cell 1.

[0032] According to some embodiments of this utility model, the fixing film 3 is a thermoplastic material. That is, the fixing film 3 can be melted by heating, allowing it to better adhere to the solder ribbon 2, such as wrapping around it, thereby improving the fixing effect of the fixing film 3 on the solder ribbon 2. Furthermore, during the lamination process of the photovoltaic module 100, the encapsulating film 20 needs to be melted by heating. Therefore, the fixing film 3 can be heated using the same heating device as the encapsulating film 20, thus saving production costs.

[0033] According to some embodiments of this utility model, the fixing film 3 is one of EVA, POE, or EPE. That is, the fixing film 3 can be an EVA (Ethylene Vinyl Acetate Copolymer), a POE (Polyolefin elastomer), or an EPE (Expandable Polyethylene). The material of the fixing film 3 can be flexibly selected according to the specific application requirements and performance requirements, and no specific limitations are imposed here.

[0034] In some embodiments, the fixing film 3 is transparent to ensure that light can pass smoothly through the fixing film 3 to reach the battery cell 1.

[0035] According to some embodiments of this utility model, the fixing film 3 is a photocurable film. The photocurable film has strong structural durability, fast curing speed, and strong adhesion; therefore, it can improve the connection stability between the fixing film 3 and the battery cell 1 and the solder ribbon 2, thereby improving the fixing effect of the fixing film 3 on the solder ribbon 2. Specifically, in the production process of the battery cell string 10, multiple solder ribbons 2 can be placed on the battery cell 1, and a layer of fixing film 3 can be placed on the multiple solder ribbons 2. The fixing film 3 is then pressed down using a tooling, and then irradiated with a UV lamp to melt and solidify the fixing film 3, forming a firm connection with the solder ribbon 2 and the battery cell 1.

[0036] It should be noted that this is only an example of one method of curing the fixed coating 3, to facilitate understanding of the connection between the fixed coating 3 and the battery cell 1 and the welding ribbon 2. The fixed coating 3 can also be heated and melted by the lamp tube of the welding machine, etc., without specific limitations.

[0037] According to some embodiments of this utility model, the thickness of the fixing film 3 ranges from 0.08 to 0.12 mm. It can be understood that the greater the thickness of the fixing film 3, the better the fixing effect of the fixing film 3 on the solder ribbon 2, and the greater the height of the portion of the fixing film 3 covering the solder ribbon 2 protruding from the battery cell 1, resulting in a corresponding increase in the thickness of the battery cell 1, and also a higher cost of using the fixing film 3. Conversely, the smaller the thickness of the fixing film 3, the smaller the height of the portion of the fixing film 3 covering the solder ribbon 2 protruding from the battery cell 1, the smaller the thickness of the battery cell 1, and the lower the cost of using the fixing film 3, but the worse the fixing effect of the fixing film 3 on the solder ribbon 2.

[0038] Therefore, by controlling the thickness of the fixing film 3 within the range of 0.08mm to 0.12mm, it is possible to avoid the fixing film 3 being too thin, which would affect the fixing effect of the welding ribbon 2. At the same time, it is possible to avoid the fixing film 3 being too thick, which would increase the thickness and cost of the battery cell string 10. That is, while ensuring the fixing effect of the fixing film 3 on the welding ribbon 2, the thickness and cost of the battery cell string 10 are controlled. The thickness of the fixing film 3 can be 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, etc.

[0039] The battery cell string 10 according to a second aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0040] According to a second aspect embodiment of the present invention, a battery cell string 10 includes: a plurality of battery cells 1, a plurality of welding ribbons 2 and a fixing film 3. The plurality of battery cells 1 are connected by the plurality of welding ribbons 2, and the plurality of welding ribbons 2 are arranged at intervals on the battery cells 1. The fixing film 3 is used to fix the plurality of welding ribbons 2 to the battery cells 1.

[0041] In this process, multiple solder ribbons 2 are fixed to the solar cell 1 by a fixing film 3, which effectively maintains the position of the solder ribbons 2 on the solar cell 1. Furthermore, when the solar cell string 10 is used in the photovoltaic module 100, the fixing film 3 avoids the risk of the solder ribbons 2 shifting due to being wrapped by the encapsulating film 20 during the lamination process, thereby avoiding the risks of poor soldering and short circuits due to overlapping, thus improving the stability of the solar cell string 10. In addition, the fixing process of multiple solder ribbons 2 can be simplified, thereby improving the production efficiency of the solar cell string 10.

[0042] According to the second aspect embodiment of the present invention, in the cell string 10, multiple solder ribbons 2 are fixed to the cell 1 by a fixing film 3. This effectively maintains the position of the solder ribbons 2 on the cell 1. Furthermore, when the cell string 10 is used in a photovoltaic module 100, the fixing film 3 avoids the risk of the encapsulating film 20 causing the solder ribbons 2 to shift during the lamination process, thereby preventing the risks of poor soldering and short circuits due to overlapping, thus improving the stability of the cell string 10. In addition, the fixing process of multiple solder ribbons 2 can be simplified, thereby improving the production efficiency of the cell string 10.

[0043] It should be noted that the battery cell 1 has solder strips 2 on both sides in the thickness direction. Therefore, the battery cell 1 has a fixing film 3 on both opposite sides. One fixing film 3 is used to fix the solder strips 2 on the front side of the battery cell 1, and the other fixing film 3 is used to fix the solder strips 2 on the back side of the battery cell 1.

[0044] According to some embodiments of this utility model, the number of pre-bonded areas 31 in each fixing film 3 is the same as the number of solder ribbons 2 and they correspond one-to-one. Each pre-bonded area 31 defines a fixing space for fixing the solder ribbon 2 with the battery cell 1. The outer periphery of the fixing space projected onto the reference plane is a closed ring, and the reference plane is perpendicular to the extension direction of the solder ribbon 2. That is, the part of the fixing space defined by the fixing film 3 and the battery cell 1, i.e., the inner peripheral wall of the fixing space, can completely cover the solder ribbon 2 in the circumferential direction. In other words, the fixing film 3 and the battery cell 1 work together to form a closed ring-shaped fixing structure to fix the solder ribbon 2. Therefore, the fixing effect of the solder ribbon 2 can be improved to stably maintain the position of the solder ribbon 2. In addition, by completely separating two adjacent fixing spaces, the fixing film 3 can also provide good insulation effect.

[0045] According to some embodiments of this utility model, the fixing film 3 is adhesively connected to the battery cell 1 and the welding ribbon 2. This adhesive connection method is simple, completely covers the contact area between the fixing film 3, the battery cell 1, and the welding ribbon 2, and eliminates the need for connecting structures such as holes or slots, while also minimizing space usage. Therefore, while ensuring the stability of the connection between the fixing film 3 and the battery cell 1 and welding ribbon 2, the connection structure can be simplified, and the overall size of the battery cell string 10 can be controlled to improve space utilization.

[0046] According to some embodiments of this utility model, the projection of the solder ribbon 2 on the battery cell 1 is a first projection, and the projection of the fixing film 3 on the battery cell 1 is a second projection, with the first projection located within the second projection. That is, the fixing film 3 can completely cover the portion of the solder ribbon 2 located on the battery cell 1. Therefore, the portion of the solder ribbon 2 located on the battery cell 1 can be firmly fixed to the battery cell 1 by the fixing film 3, thereby improving the fixing effect of the fixing film 3 on the solder ribbon 2.

[0047] According to some embodiments of this utility model, the thickness of the fixing film 3 is less than the diameter of the solder ribbon 2. It is understood that after the fixing film 3 is placed on the battery cell 1 and the solder ribbon 2 is fixed, the greater the thickness of the fixing film 3, the greater the height of the portion of the fixing film 3 covering the solder ribbon 2 protruding from the battery cell 1, resulting in a greater thickness of the battery cell 1 and a higher cost of using the fixing film 3. Conversely, the smaller the thickness of the fixing film 3, the smaller the height of the portion of the fixing film 3 covering the solder ribbon 2 protruding from the battery cell 1, resulting in a smaller thickness of the battery cell 1 and a lower cost of using the fixing film 3. Therefore, by setting the thickness of the fixing film 3 to be less than the diameter of the solder ribbon 2, the impact of the fixing film 3 on the overall thickness of the battery cell string 10 can be effectively reduced. Furthermore, by controlling the thickness of the fixing film 3, the cost of using the fixing film 3 can be reduced, thereby improving the economic efficiency of the battery cell string 10.

[0048] A photovoltaic module 100 according to a third aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0049] A photovoltaic module 100 according to a third aspect embodiment of the present invention includes: a string of solar cells 10 and an encapsulating film 20. The encapsulating film 20 covers the outside of the string of solar cells 10. The portion where the solder ribbon 2 is welded to the solar cell 1 is the welded portion. A fixing film 3 is used to separate the welded portion from the encapsulating film 20. That is, by fixing the film 3, the encapsulating film 20 can be prevented from contacting the solder ribbon 2 and the welded position of the solar cell 1. Therefore, during the lamination process, the portion where the solder ribbon 2 is welded to the solar cell 1 can be prevented from shifting due to the flow of the encapsulating film 20.

[0050] According to the second aspect of the present invention, the photovoltaic module 100 can avoid the risk of the encapsulation film 20 shifting due to the misalignment of the solder ribbon 2 during the lamination process by fixing the film 3, thereby avoiding the risk of poor soldering and short circuit due to overlapping, and thus improving the stability of the cell string 10.

[0051] Specifically, the photovoltaic module 100 also includes two layers of surface glass 30, which are located on the side of the encapsulating film 20 away from the solar cell 1. The surface glass 30 and the solar cell string 10 can be connected through the encapsulating film 20.

[0052] According to some embodiments of this utility model, the fixing film 3 and the encapsulating film 20 are made of the same material. It is understood that because the encapsulating film 20 and the fixing film 3 are made of the same material, the lamination conditions of the fixing film 3 can be close to or the same as those of the encapsulating film 20, thereby reducing the requirements on the laminator. Simultaneously, it can reduce the adverse effects of the lamination interface layer between the fixing film 3 and the encapsulating film 20, thus improving the reliability of the photovoltaic module 100.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fixing film for fixing a solder strip to a battery sheet, characterized in that, include: Multiple pre-bonded areas and multiple connecting areas are arranged alternately, the pre-bonded areas being adapted to cover the side of the solder strip opposite to the solar cell, and the connecting areas being adapted to adhere to the solar cell.

2. The fixed film according to claim 1, wherein The fixing film is made of a hot-melt material.

3. The fixed film according to claim 2, wherein The fixing coating is one of EVA, POE or EPE.

4. The fixed film according to claim 1, wherein The fixing film is a photocurable film.

5. The fixed film according to claim 1, wherein The thickness of the fixed coating ranges from 0.08 to 0.12 mm.

6. A string of battery cells, characterized by, include: Multiple battery cells; Multiple welding strips are used to connect multiple solar cells, and the welding strips are arranged at intervals on the solar cells. The fixing coating according to any one of claims 1-5 is used to fix the plurality of welding ribbons to the battery cell.

7. The string of battery cells of claim 6, wherein, Each of the fixed coatings has a plurality of pre-bonded regions that are the same number as and correspond one-to-one with a plurality of solder ribbons. Each of the pre-bonded regions defines a fixed space for fixing the solder ribbons with the solar cell. The outer periphery of the fixed space projected onto a reference plane is a closed ring. The reference plane is perpendicular to the extension direction of the solder ribbons. And / or, the fixed coatings are the same number as and correspond one-to-one with the solar cells.

8. The string of battery cells of claim 6, wherein, The projection of the solder strip onto the battery cell is a first projection, and the projection of the fixing film onto the battery cell is a second projection, with the first projection located within the second projection; and / or, the thickness of the fixing film is less than the diameter of the solder strip.

9. A photovoltaic module, characterized by include: Battery cell string according to any one of claims 6-8; An encapsulating film is used to cover the outside of the battery cell string. The portion of the solder ribbon that is welded to the battery cell is called the welded portion. The fixing film is used to separate the welded portion from the encapsulating film.

10. The photovoltaic module of claim 9, wherein, The fixing film is made of the same material as the encapsulating film.

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