Photovoltaic module

Abstract

The utility model relates to photovoltaic technical field especially relates to a kind of photovoltaic module.The photovoltaic module includes first cell piece, second cell piece, first solder strip, second solder strip and first strip membrane. Among them, the front and back of first cell piece are connected with first solder strip and second solder strip respectively, and first solder strip extends to the back of second cell piece;First cell piece and second cell piece have first gap between them. First strip membrane is set corresponding to first gap, and one side edge of first strip membrane extends to the back of first cell piece, and covers the end of second solder strip. First strip membrane can improve the stability of the welding end of second solder strip and the connection of first cell piece, and then improve the current collection capacity at the edge of first cell piece, reduce or avoid the occurrence of EL imaging black edge condition, improve the power generation of photovoltaic module, save cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a photovoltaic module. BACKGROUND

[0002] At present, in the battery string process of photovoltaic module, the strip film is usually used to pre-fix the welding strip, but the current strip film coating method only fixes the welding strip on the front and back of the cell piece, and does not effectively fix the welding strip end point position at the edge of the cell piece, which can cause the insufficient current collection capacity of the welding strip at the edge of the cell piece, the black edge of EL imaging and other adverse phenomena, reduce the power generation of the photovoltaic module and increase the cost.

[0003] Therefore, it is urgent to design a photovoltaic module to solve the above technical problems. UTILITY MODEL CONTENT

[0004] The utility model discloses a photovoltaic module, which can improve the stability and reliability of the connection between the welding end of the second welding strip and the first cell piece, improve the current collection capacity at the edge of the first cell piece, and improve the power generation of the photovoltaic module.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a photovoltaic module, which comprises:

[0007] The first cell piece and the second cell piece are connected with the first welding strip and the second welding strip on the front and back respectively, and the first welding strip extends to the back of the second cell piece; the first cell piece and the second cell piece have a first gap therebetween;

[0008] The first strip film is arranged corresponding to the first gap, and one side edge of the first strip film extends to the back of the first cell piece and covers the end of the second welding strip.

[0009] As an optional technical scheme of the photovoltaic module, the other side edge of the first strip film extends to the back of the second cell piece; the side of the first strip film towards the first cell piece is provided with a reflective layer, one end of the reflective layer is overlapped on the first cell piece, the other end of the reflective layer is overlapped on the first welding strip on the back of the second cell piece, and part of the reflective layer shields the first gap.

[0010] As an optional technical scheme of the photovoltaic module, the end of the reflective layer overlapped on the first cell piece has a second gap between the end of the second welding strip.

[0011] As an optional technical solution of the photovoltaic module, in the first direction, the width M of the light reflection layer is less than the width N of the first film, the light reflection layer and the first film surround to form a stepped groove, and the welding end of the second welding strip is accommodated in part of the stepped groove, and the welding end of the second welding strip and the side wall of the stepped groove form the second gap.

[0012] As an optional technical solution of the photovoltaic module, a base layer is further arranged between the light reflection layer and the first film, one side of the base layer is connected with the first film, and the other side of the base layer is connected with the light reflection layer.

[0013] As an optional technical solution of the photovoltaic module, the material of the first film is one of EVA, PVB or TPO; the material of the base layer is PET; and the material of the light reflection layer is aluminum foil.

[0014] As an optional technical solution of the photovoltaic module, the thickness of the first film is arranged to be between 60μm-90μm, the thickness of the base layer is arranged to be between 30μm-50μm, and the thickness of the light reflection layer is arranged to be between 0.05μm-0.1μm.

[0015] As an optional technical solution of the photovoltaic module, the photovoltaic module further comprises a plurality of second films, the second films cover part of the second welding strips and part of the first welding strips located on the back surface of the second cell pieces; the extension directions of the second films, the first welding strips and the second welding strips are the same, and the extension directions of the second films and the first films are perpendicular to each other.

[0016] As an optional technical solution of the photovoltaic module, the material of the second film is one of EVA, PVB or TPO, and the thickness of the second film is arranged to be between 100μm-1000μm.

[0017] As an optional technical solution of the photovoltaic module, the first cell piece and the second cell piece are both TOPCon cells or HJT cells.

[0018] The beneficial effects of the photovoltaic module at least include:

[0019] The utility model provides a kind of photovoltaic module, which comprises a first cell piece, a second cell piece, a first welding strip, a second welding strip and a first film. The front and back surfaces of the first cell piece are connected with the first welding strip and the second welding strip, respectively. The first welding strip extends to the back surface of the second cell piece. The first cell piece and the second cell piece have a first gap. The first film is arranged corresponding to the first gap. The side edge of the first film extends to the back surface of the first cell piece and covers the end of the second welding strip.

[0020] The first strip of film is arranged between the first battery piece and the second battery piece (between the pieces), and one side edge of the first strip of film extends to the back of the first battery piece and covers the end of the second welding strip. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the contents of the embodiments of the present application and the drawings without creative labor.

[0022] Figure 1 FIG. 1 is a structural schematic view of a first battery piece, a second battery piece, a first strip of film and a second strip of film provided by the embodiments of the present application;

[0023] Figure 2 FIG. 1 is a structural schematic view of a first battery piece, a second battery piece, a first strip of film and a second strip of film provided by the embodiments of the present application;

[0024] Figure 3 FIG. 1 is a structural schematic view of a first battery piece, a second battery piece, a first strip of film and a second strip of film provided by the embodiments of the present application; Figure 2 FIG. 1 is a structural schematic view of a first battery piece, a second battery piece, a first strip of film and a second strip of film provided by the embodiments of the present application;

[0025] Figure 4 FIG. 1 is a structural schematic view of a first battery piece, a second battery piece, a first strip of film and a second strip of film provided by the embodiments of the present application;

[0026] LIST OF ELEMENTS

[0027] 10, first battery piece; 20, second battery piece; 21, first gap; 30, first welding strip; 40, second welding strip; 50, first strip of film; 51, light reflecting layer; 52, base layer; 53, stepped groove; 54, second gap; 60, second strip of film. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] This embodiment provides a photovoltaic module that can improve the stability and reliability of the connection between the starting end (end) of the second solder strip and the first cell, improve the current collection capability at the edge of the first cell, and increase the power generation of the photovoltaic module.

[0036] like Figures 1-4 As shown, the photovoltaic module mainly includes a first solar cell 10, a second solar cell 20, a first solder ribbon 30, a second solder ribbon 40, and a first strip film 50. The first solder ribbon 30 and the second solder ribbon 40 are respectively connected to the front and back sides of the first solar cell 10, with the first solder ribbon 30 extending to the back side of the second solar cell 20. A first gap 21 exists between the first solar cell 10 and the second solar cell 20. The first strip film 50 is disposed corresponding to the first gap 21, with one edge of the first strip film 50 extending to the back side of the first solar cell 10 and covering the end of the second solder ribbon 40. The back side of the first solar cell 10 is... Figure 3 The upper surface of the first battery cell 10, the front surface of the first battery cell 10 is... Figure 3 The lower surface of the first battery cell 10.

[0037] Furthermore, in this embodiment, one edge of the first film 50 is connected to the starting end (end) of the second solder strip 40, and the other edge of the first film 50 is connected to the starting end (end) of the first solder strip 30 on the back of the second battery cell 20, thus partially shielding the first gap 21. Based on the above design, in this embodiment, by providing a first film 50 between the first battery cell 10 and the second battery cell 20 (between cells), and with one edge of the first film 50 connected to the starting end of the second solder strip 40, and the other edge of the first film 50 connected to the starting end of the first solder strip 30 on the back of the second battery cell 20, partially shielding the first gap 21. In other words, the first film 50 is divided into three regions. The first region covers the back of the first solar cell 10 and is connected to the second solder ribbon 40. The second region is used to shield the first gap 21. The third region covers the back of the second solar cell 20 and is connected to the starting end of the first solder ribbon 30 located on the back of the second solar cell 20. This allows the first film 50 to not only fix the starting end of the second solder ribbon 40 on the first solar cell 10, improving the stability and reliability of the connection between the starting end of the second solder ribbon 40 and the first solar cell 10, but also to ensure the stability and reliability of the connection between the starting end of the first solder ribbon 30 on the back of the second solar cell 20 and the second solar cell 20. This improves the current collection capacity at the edges of the first solar cell 10 and the second solar cell 20, reduces or avoids black edges in EL imaging, improves the product yield and power generation of photovoltaic modules, and saves costs.

[0038] It is understandable that the lamination process melts the first film 50, thereby enabling the two ends of the first film 50 to be bonded to the first welding ribbon 30 and the second welding ribbon 40, so as to fix the second welding ribbon 40 on the first battery cell 10 and the first welding ribbon 30 on the second battery cell 20.

[0039] Optionally, in this embodiment, both the first battery cell 10 and the second battery cell 20 are configured as multiple cells, and the first battery cell 10 and the second battery cell 20 are arranged at intervals. A first solder strip 30 and a second solder strip 40 are used to achieve series connection between adjacent first battery cells 10 and second battery cells 20 to form a battery string. Optionally, the first battery cell 10 and the second battery cell 20 are of the same type, for example, both can be configured as TOPCon batteries or HJT batteries.

[0040] like Figure 4 As shown, in this embodiment, a reflective layer 51 is provided on the side of the first film 50 facing the first battery cell 10. One end of the reflective layer 51 is attached to the first battery cell 10, and the other end of the reflective layer 51 is attached to the first solder strip 30 on the back of the second battery cell 20. Part of the reflective layer 51 covers the first gap 21.

[0041] By setting the reflective layer 51, light can be reflected and refracted, thereby improving the utilization rate of light by the first solar cell 10 and the second solar cell 20, further increasing the power generation of the photovoltaic module, and saving costs.

[0042] In some embodiments, the reflective layer 51 can also be disposed on opposite sides of the first film 50, which can improve the light utilization rate of the front and back of the photovoltaic module, so as to be suitable for double-glass photovoltaic modules and improve the bifaciality of the photovoltaic module.

[0043] Furthermore, in this embodiment, a second gap 54 is formed between the end of the reflective layer 51 attached to the first solar cell 10 and the starting end of the second solder strip 40. In other words, the reflective layer 51 does not contact the first solder strip 30. This reduces the amount of material used in the reflective layer 51, saving materials and costs. On the other hand, it avoids short circuits in the first solar cell 10, improving the safety of the photovoltaic module.

[0044] like Figure 4 As shown, in the embodiment, along the first direction (the first direction is...) Figure 4 In the X-axis direction, the width M of the reflective layer 51 is smaller than the width N of the first film 50. The reflective layer 51 and the first film 50 form a stepped groove 53. The starting end of the second solder strip 40 is accommodated in part of the stepped groove 53, and the starting end of the second solder strip 40 and the sidewall of the stepped groove 53 form a second gap 54. The stepped groove 53 can provide a certain accommodating space for the starting end of the second solder strip 40, thereby maximizing the flatness of the second film 60 during the lamination process and preventing stress concentration on the first battery cell 10.

[0045] like Figure 4 As shown, in this embodiment, a base layer 52 is further provided between the reflective layer 51 and the first film 50. One side of the base layer 52 is connected to the first film 50, and the other side of the base layer 52 is connected to the reflective layer 51. The base layer 52 can improve the stability and ease of connection between the reflective layer 51 and the first film 50, and prevent the first film 50 from melting during the lamination process, which could cause the reflective layer 51 to misalign.

[0046] Optionally, in this embodiment, the first film 50 is made of one of EVA, PVB or TPO; the substrate layer 52 is made of PET; and the reflective layer 51 is made of aluminum foil.

[0047] Optionally, in this embodiment, the thickness of the first film 50 is set to be between 60μm and 90μm, the thickness of the substrate layer 52 is set to be between 30μm and 50μm, and the thickness of the reflective layer 51 is set to be between 0.05μm and 0.1μm.

[0048] Of course, the operator can also set the thickness and material of the first film 50, the base layer 52 and the reflective layer 51 according to actual needs, which will not be described in detail here.

[0049] As shown in the drawings, Figure 1 In the embodiment, the photovoltaic module further comprises a plurality of second films 60, the second films 60 are covered on part of the second ribbons 40 and part of the first ribbons 30 on the back of the second cell 20; the extension directions of the second films 60, the first ribbons 30 and the second ribbons 40 are the same, and the extension direction of the second film 60 is perpendicular to the extension direction of the first film 50. In other words, the first film 50 is arranged horizontally, and the second film 60 is arranged vertically. Figure 1 Figure 1 The arrangement of the second film 60 can improve the pre-fixing effect between the first ribbons 30 (non-welding end) and the first cell 10 and the second cell 20, and reduce the phenomenon of deviation of the first ribbons 30; meanwhile, the second film 60 can also improve the pre-fixing effect between the second ribbons 40 and the first cell 10, and reduce the phenomenon of deviation of the second ribbons 40, and the second film 60 is also conducive to the adhesive connection with the back glass or the back plate, and improves the integrity of the photovoltaic module.

[0050] Optionally, the material of the second film 60 in the embodiment is one of EVA, PVB or TPO, and the thickness of the second film 60 is set to be between 100 μm and 1000 μm. That is, the material of the first film 50 and the second film 60 is the same, which improves the processing efficiency and saves the cost.

[0051] Of course, the operator can also set the thickness and material of the second film 60 according to actual needs, which will not be described in detail here.

[0052] Of course, the second film 60 can also cover the front of the first cell 10 and the front of the second cell 20, so as to realize the pre-fixing effect on the ribbons on the front of the first cell 10 and the front of the second cell 20, and is also conducive to the adhesive connection with the front glass.

[0053] Obviously, the above is only a preferred embodiment of the present application and the applied technical principle. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

[0054] ​It is noted that in the description of the specification, the description referring to the terms "some embodiments", "other embodiments", and the like, means that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The appearance of the above terms in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises: a first cell sheet (10) and a second cell sheet (20), the front side and the back side of the first cell sheet (10) are connected with a first solder strip (30) and a second solder strip (40) respectively, the first solder strip (30) extends to the back side of the second cell sheet (20); the first cell sheet (10) and the second cell sheet (20) have a first gap (21) therebetween; a first strip of film (50) is arranged corresponding to the first gap (21), one side edge of the first strip of film (50) extends to the back side of the first cell sheet (10) and covers the end of the second solder strip (40).

2. The photovoltaic module of claim 1, wherein, The other side edge of the first strip of film (50) extends to the back side of the second cell sheet (20); one side of the first strip of film (50) is provided with a light-reflecting layer (51) which is overlapped on the first cell sheet (10) at one end and on the first solder strip (30) at the other end, part of the light-reflecting layer (51) shields the first gap (21).

3. The photovoltaic module of claim 2, wherein, The end of the light-reflecting layer (51) overlapped on the first cell sheet (10) has a second gap (54) with the end of the second solder strip (40).

4. The photovoltaic module of claim 3, wherein, In the first direction, the width M of the light-reflecting layer (51) is smaller than the width N of the first strip of film (50), the light-reflecting layer (51) and the first strip of film (50) enclose a stepped groove (53), the starting end of the second solder strip (40) is accommodated in part of the stepped groove (53), and the starting end of the second solder strip (40) and the sidewall of the stepped groove (53) form the second gap (54).

5. The photovoltaic module of claim 2, wherein, A base layer (52) is further arranged between the light-reflecting layer (51) and the first strip of film (50), one side of the base layer (52) is connected with the first strip of film (50), and the other side of the base layer (52) is connected with the light-reflecting layer (51).

6. The photovoltaic module of claim 5, wherein, The material of the first strip of film (50) is one of EVA, PVB or TPO; the material of the base layer (52) is PET; and the material of the light-reflecting layer (51) is aluminum foil.

7. The photovoltaic module of claim 5, wherein, The thickness of the first strip of film (50) is set to 60-90μm, the thickness of the base layer (52) is set to 30-50μm, and the thickness of the light-reflecting layer (51) is set to 0.05-0.1μm.

8. The photovoltaic module of claim 1, wherein, The photovoltaic module further comprises a plurality of second strips of film (60) which cover part of the second solder strip (40) and part of the first solder strip (30) on the back side of the second cell sheet (20); the extension directions of the second strips of film (60), the first solder strip (30) and the second solder strip (40) are the same, and the extension directions of the second strips of film (60) and the first strip of film (50) are perpendicular to each other.

9. The photovoltaic module of claim 8, wherein, The material of the second strips of film (60) is one of EVA, PVB or TPO, and the thickness of the second strips of film (60) is set to 100-1000μm.

10. The photovoltaic module according to any of claims 1-9, characterized in that, The first cell piece (10) and the second cell piece (20) are both TOPCon cells or HJT cells.

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