Photovoltaic module
By setting the intersection of cut seams on the back film or filler film of photovoltaic modules, the problems of lead wire misalignment and insufficient adhesive are solved, the encapsulation quality and module life are improved, and non-destructive punching and self-healing effects are achieved.
Patent Information
- Application Number
- CN202423207997.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing photovoltaic modules are prone to missing adhesive at the lead wire exit hole on the back, which affects the encapsulation quality and module lifespan, and the lead wire may be misaligned, leading to cell breakage.
Multiple slits are made on the back adhesive film or filler film to form intersections. The lead wires pass through the intersections to avoid offset or skew. Non-destructive punching is used to prevent material loss, and self-healing technology is used to ensure the quality of the encapsulation.
This effectively avoids lead wire misalignment or skew, improves the encapsulation quality and lifespan of photovoltaic modules, prevents glue shortage, and ensures the stability and reliability of the modules.
Smart Images
Figure CN223798583U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology; specifically, this utility model relates to a photovoltaic module. Background Technology
[0002] Driven by the dual goals of cost reduction and efficiency improvement, the weight of encapsulant film in photovoltaic modules is getting smaller and smaller. The photovoltaic module encapsulation consists of front glass, front encapsulant film, cell strings, busbars, and back encapsulant film. Since the busbar leads need to pass through to the outside of the module, holes need to be drilled in the back encapsulant film or back glass to allow the leads to pass through.
[0003] The existing perforations in the back film can cause insufficient adhesive at the exit points of the lead wires during module encapsulation. This not only affects the encapsulation quality and performance of the photovoltaic module but may also reduce its lifespan. Furthermore, misalignment of the perforation position in the film can cause misalignment of the lead wire entry holes, and stress stress can lead to cell breakage or damage. Utility Model Content
[0004] In view of this, the present invention provides a photovoltaic module that solves or at least alleviates one or more of the above-mentioned problems and other problems existing in the prior art.
[0005] To achieve the aforementioned objectives, a first aspect of this utility model provides a photovoltaic module, comprising a front glass panel, a front encapsulating film, a battery pack, a back encapsulating film, and a backsheet stacked sequentially; the battery pack includes multiple battery strings and busbars connected to the multiple battery strings, with lead wires formed by the busbars passing through the back encapsulating film and the backsheet to extend to the outside of the photovoltaic module; wherein the back encapsulating film has an opening at the lead wire's exit position, and the photovoltaic module further includes a filler film disposed on the side of the back encapsulating film away from the battery pack and covering the opening, the filler film having multiple slits at the corresponding positions of the opening, the multiple slits forming an intersection point, and the lead wire passing through the opening of the back encapsulating film and exiting from the intersection point of the filler film.
[0006] In the photovoltaic module described above, optionally, the back film has a plurality of openings, and the filler film is strip-shaped, covering the plurality of openings of the back film.
[0007] In the photovoltaic module as described above, optionally, the back film has a plurality of openings, and the filler film is block-shaped and has a plurality of openings, each of the filler films covering a single opening of the back film.
[0008] In the photovoltaic module as described above, optionally, at the location where the lead wire passes through, the filler film has multiple slits extending outward from the intersection point to form a circle with the intersection point as the center.
[0009] In the photovoltaic module described above, optionally, when the lead wire passes through the intersection point, at least a portion of the filler film at the corresponding position opens along multiple slits, and the filler film between adjacent slits forms an opening. Multiple openings are opened to form a channel through which the lead wire passes.
[0010] In the photovoltaic module as described above, optionally, the flap also has an indentation, and the flap bends at the indentation when opened.
[0011] In the photovoltaic module described above, optionally, the openings in the back adhesive film are circular or elliptical.
[0012] The adhesive film at the location of the lead wire has multiple slits that intersect, for example, forming a star-shaped or plum-blossom pattern, to facilitate the lead wire's exit from the intersection. In the aforementioned photovoltaic module, these slits are located on an additional filler film. Based on the same concept, this invention provides another technical solution: forming multiple slits on the back adhesive film.
[0013] To achieve the aforementioned objective, a second aspect of this utility model provides a photovoltaic module, the photovoltaic module comprising a front glass panel, a front encapsulating film, a battery pack, a back encapsulating film, and a backsheet stacked sequentially; the battery pack includes multiple battery strings and busbars connected to the multiple battery strings, the busbars forming lead wires passing through the back encapsulating film and the backsheet to extend to the outside of the photovoltaic module; wherein, the back encapsulating film has multiple slits in the area through which each lead wire passes, the multiple slits forming an intersection point, and the lead wire exiting from the intersection point.
[0014] In the photovoltaic module as described above, optionally, at the location where the lead wire passes through, the back film has multiple slits extending outward from the intersection point to form a circle with the intersection point as the center.
[0015] In the photovoltaic module described above, optionally, when the lead wire passes through the intersection point, at least a portion of the back adhesive film at the corresponding position opens along multiple slits, and the back adhesive film between adjacent slits forms an opening. Multiple openings open to form a channel through which the lead wire passes. The opening also has an indentation, and the opening bends at the indentation when it is opened.
[0016] This photovoltaic module features multiple slits in the encapsulant film near the busbar leads. These slits intersect at a specific point, such as a star-shaped or plum-blossom pattern. This provides a defined intersection point for the leads to emerge, preventing lead misalignment or skew. The punching process ensures the encapsulant film is cut without material loss. This non-destructive punching method prevents material loss, promotes self-healing, and prevents missing encapsulant. It does not affect the encapsulation quality and performance of the photovoltaic module, thus extending its lifespan. Based on the same concept, this invention offers two technical solutions: the multiple slits with a common intersection can be applied directly to the corresponding positions on the back encapsulant film, or they can be applied to the corresponding positions on the filler film covering the back encapsulant film. Attached Figure Description
[0017] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:
[0018] Figure 1 This is a schematic diagram of photovoltaic module installation according to one embodiment of this application;
[0019] Figure 2 This is a schematic diagram of the opening in the back adhesive film according to an embodiment of this application;
[0020] Figure 3 for Figure 2 A graphic illustration of the openings in the adhesive film on the back;
[0021] Figure 4 for Figure 2 Another graphic illustration of the opening in the adhesive film on the back;
[0022] Figure 5 This is a schematic diagram showing that a filling adhesive film is applied to the back adhesive film according to an embodiment of this application;
[0023] Figure 6 This is another schematic diagram showing that a filling adhesive film is applied to the back adhesive film according to an embodiment of this application;
[0024] Figure 7 This is a schematic diagram of the slits on the filler film according to an embodiment of this application;
[0025] Figure 8 For the lead wire from Figure 7 A three-dimensional schematic diagram of the filling adhesive film protruding from the middle;
[0026] Figure 9 This is a schematic diagram of the slits on the back adhesive film according to another embodiment of this application;
[0027] Figure 10 for Figure 9A magnified diagram of the kerf;
[0028] Figure 11 for Figure 9 A three-dimensional schematic diagram showing the lead wires emerging from the back adhesive film;
[0029] Figure 12 This is a schematic diagram of the slit cut according to an embodiment of this application;
[0030] Figure 13 This is a schematic diagram of other slits in an embodiment of this application;
[0031] Figure label:
[0032] 1-Front panel glass; 2-Front end film; 3-Battery pack; 31-Battery string; 32-Busbar; 321-Lead wire; 4-Back end film; 41-Opening; 5-Filling end film; 51-Cut; 511-Intersection; 512-Extension end; 52-Opening; 521-Indentation; 6-Back end film; 61-Cut; 611-Intersection; 612-Extension end; 62-Opening; 621-Indentation. Detailed Implementation
[0033] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the photovoltaic module of this utility model will be described below by way of example; however, all descriptions should not be construed as limiting the present utility model in any way.
[0034] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various drawings, the present invention still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle. Therefore, these further embodiments according to the present invention should also be considered within the scope of the description herein.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.
[0036] Firstly, such as Figures 1 to 8As shown, this application provides a photovoltaic module, which includes a front glass panel 1, a front encapsulating film 2, a battery pack 3, a back encapsulating film 4, and a backsheet (not shown) stacked sequentially. The battery pack 3 includes multiple battery strings 31 and busbars 32 connected to the multiple battery strings. The lead wires 321 formed by the busbars 32 pass through the openings 41 of the back encapsulating film 4 and the openings of the backsheet to lead to the outside of the photovoltaic module. A filler film 5 is then applied to the openings on the side of the back encapsulating film 4 away from the battery pack 3. The filler film 5 has multiple slits 51 at the corresponding positions where the lead wires 321 pass through. The multiple slits form an intersection point 511, and the multiple slits 51 extend outward from the intersection point 511 to form a star-shaped or plum-shaped slit pattern. The end of the slit 51 extending outward from the intersection point 511 is the extension end 512. The lead wire 321 passes through the opening 41 of the back adhesive film 4 and then emerges from the intersection 511 of the filling adhesive film 5. The lead wire 321 emerges from the intersection 511; in other words, the star-shaped or quincunx-shaped cuts 51 of the filling adhesive film 5 provide a defined intersection 511 from which the lead wire 321 emerges, thus avoiding the offset or skew of the lead wire 321.
[0037] Busbar 32 connects the battery strings 31 in series, and the end of busbar 32 is bent to form a lead wire 321. The lead wire 321 passes through one side of the back film 4 and leads out to the outside of the photovoltaic module, connecting to the interface on the outside of the photovoltaic module. In this way, the lead wire conducts the current of the photovoltaic module.
[0038] To allow for more adhesive film filling at the lead wire location on the back of the adhesive film, circular holes are punched in the back adhesive film (e.g., Figure 3 (as shown) or elliptical hole (such as) Figure 4 In the case shown), a filler film 5 is applied over the back adhesive film; the cuts on the filler film 5 are formed by punching. The punching process cuts the adhesive film without any material falling out or being missing. This process does not cause any loss of the filler film 5, thus avoiding the risk of missing adhesive in subsequent processes. Moreover, the filler film 5 at the lead wire 321 position can heal itself in subsequent processes.
[0039] Lead wire 321 needs to be led out from three locations on the photovoltaic module. Therefore, the filler film 5 needs to be punched with three cross-shaped or plum blossom-shaped cuts 51 at the corresponding locations. Figure 5 As shown, the filler film 5 is strip-shaped, which can cover the three openings 41 on the back film 4 at the same time. The equipment or manual personnel will cover the openings 41 with the filler film 5, which has been punched with three cross-shaped or plum blossom-shaped cuts, and pass the lead wire through the cuts 51.
[0040] like Figure 6As shown, the filler film 5 is in the form of a block. The three block-shaped filler films cover the three openings 41 on the back film 4 respectively. The block-shaped filler film 5 is manually covered at the three openings 41, and a cross-shaped cut 51 has been punched at the corresponding position of each filler film 5 for the lead wire 321 to pass through.
[0041] Thus, compared to Figure 5 The strip-shaped filler film is more economical and saves on film material.
[0042] like Figure 7 The diagram shows either a block-shaped filler film 5 or a partial diagram of a strip-shaped filler film 5. At a location corresponding to a lead-out line on the filler film 5, there are eight evenly distributed slits 51. Each slit 51 has a common intersection point 511 and extends outward from the intersection point 511 to form an extension end 512. The resulting slits form a star-shaped pattern. The extension ends 512 form a circle centered at the intersection point 511.
[0043] like Figure 8 As shown, two leads 321 are from... Figure 7 The filler film 5 passes through the intersection 511 of the lead-in wire 321. At the corresponding position, the filler film 5 opens along the slit, forming a flap 52 between the filler film adjacent to the slit. Two flaps 52 are formed on one side, and symmetrically, two flaps 52 are also formed on the other side of the lead-in wire 321. The four flaps 52 open when the lead-in wire 321 passes through, forming a channel for the lead-in wire 321 to pass through. A star-shaped slit can form eight flaps. In comparison, Figure 8 The symmetrical formation of four openings (52) facilitates the self-healing of the material in subsequent processes.
[0044] Figure 8 In the middle, the opening page 52 also has an indentation 521, and the opening page 52 bends at the indentation 521 when it is opened. Figure 8 The indentation 521 is approximately located at the midpoint of the line connecting the two slits on either side of the page opening. For convenience, the indentation 521 can also be located at the line connecting the extended ends of the slits on either side of the page opening.
[0045] The photovoltaic module may also include a backsheet glass, which covers the outer side and sits on top of the back film. A filler film lies between the back film and the backsheet glass. Leads 321 pass sequentially through the back film, the filler film, and the backsheet glass. Holes are drilled in the backsheet glass at the corresponding positions of the leads to facilitate their passage. The filler film also prevents material collapse caused by drilling holes in the backsheet glass.
[0046] In the above embodiments, the star-shaped or plum-shaped cuts are formed on the filler film 5, and the lead wires 321 are respectively led out through the openings 41 of the back film and the star-shaped or plum-shaped cuts 51 of the filler film 5. Based on the same concept, this application also provides a photovoltaic module, including a front glass panel, a front film, a battery pack, and a back film stacked sequentially. Compared with the above embodiments where the star-shaped or plum-shaped cuts are formed on the filler film 5, in this embodiment the star-shaped or plum-shaped cuts are formed on the back film, and the lead wires 321 are respectively led out through the star-shaped or plum-shaped cuts of the back film. In this embodiment, the back film of the photovoltaic module is no longer covered with a filler film, saving a process.
[0047] Secondly, such as Figures 9 to 11 As shown, this application also provides a photovoltaic module, including a front glass panel, a front encapsulating film, a battery pack, a back encapsulating film, and a backsheet stacked sequentially. The photovoltaic module battery pack includes multiple battery strings and busbars connected to the multiple battery strings. The lead wires formed by the busbars pass through the back encapsulating film and the backsheet to lead to the outside of the photovoltaic module. The back encapsulating film 6 has at least multiple slits at the corresponding positions where the lead wires pass through. The multiple slits form an intersection point, and the multiple slits extend outward from the intersection point to form a star-shaped or plum-shaped slit 61. The lead wires exit from the intersection point of the back encapsulating film. The lead wires 321 exit from the intersection point 611 of the back encapsulating film. In other words, the star-shaped or plum-shaped slits 61 of the back encapsulating film 6 provide a defined intersection point 611 from which the lead wires 321 exit, thus avoiding the offset or skew of the lead wires 321.
[0048] The adhesive film cutting and applying equipment punches a cross-shaped or plum blossom-shaped slit 61 at the lead wire 321 on the back adhesive film 6, automatically applies the back adhesive film 6 to the battery pack, and passes the lead wire 321 through the slit.
[0049] The cuts on the back adhesive film are formed by punching. The punching process cuts the adhesive film without any material falling out or being missing. This method prevents the back adhesive film from being missing, thus avoiding the risk of missing adhesive in subsequent processes. Moreover, the back adhesive film at the lead wire 321 position can heal itself in subsequent processes.
[0050] exist Figure 9 In the process, the lead wire 321 needs to be led out from 3 positions of the photovoltaic module. Therefore, 3 cross-shaped cuts 61 need to be punched on the back film 6 at the corresponding positions.
[0051] like Figure 10As shown, at a location corresponding to the lead wire on the back adhesive film 6, there are eight evenly distributed slits 61. Each slit 61 has a common intersection point 611 and extends outward from the intersection point 611 to form an extension end 612. The slits thus formed are in a star-shaped pattern. The extension ends 612 form a circle with the intersection point 611 as the center.
[0052] like Figure 11 As shown, two leads 321 are from... Figure 10 The adhesive film 6 on the back and sides of the leader line 321 passes through at the intersection 611. At the corresponding position, the adhesive film 6 on the back and sides of the leader line 321 opens along the slit, forming a flap 62 between adjacent slits. Two flaps 62 are formed on one side, and symmetrically, two more flaps 62 are formed on the other side of the leader line 321. The four flaps 62 open as the leader line 321 passes through, forming a channel for the leader line 321 to pass through. A star-shaped slit can form eight flaps. In comparison, Figure 11 The symmetrical formation of four openings (52) facilitates the self-healing of the material in subsequent processes.
[0053] Figure 11 In the middle, the opening page 62 also has an indentation 621, and the opening page 62 bends at the indentation 621 when it is opened. Figure 11 The indentation 621 is approximately located at the midpoint of the line connecting the two slits on either side of the page opening. For convenience, the indentation 621 can also be located at the line connecting the extended ends of the slits on either side of the page opening.
[0054] The photovoltaic module may also include a backsheet glass, which covers the outside. Lead wires 321 are located on the back film and pass through the back film and the backsheet glass in sequence. Holes are made at the corresponding positions of the lead wires on the backsheet glass to facilitate the passage of the lead wires 321.
[0055] The cut in the above embodiments, such as Figure 12 As shown, it can be a cross shape (left image) or a plum blossom shape (right image).
[0056] In one of his embodiments, as shown in Figure 13, the cut can be cross-shaped, I-shaped, or king-shaped.
[0057] This photovoltaic module utilizes a method where the encapsulant film near the busbar lead-out points is cut into a star-shaped or plum-blossom pattern. These cuts provide a defined intersection point for the lead-out points, preventing lead-out deviation or skew. The punching process ensures the encapsulant film is cut without material loss. This non-destructive punching method prevents material loss, promotes self-healing, and prevents adhesive gaps. It does not affect the encapsulation quality and performance of the photovoltaic module, thus extending its lifespan.
[0058] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.
Claims
1. A photovoltaic module, characterized by, The photovoltaic module comprises a front plate glass, a front adhesive film, a cell group, a back adhesive film and a back plate which are sequentially stacked; the cell group comprises a plurality of cell strings and bus bars connected with the plurality of cell strings, the bus bars form lead-out wires which pass through the back adhesive film and the back plate to extend to the outside of the photovoltaic module; wherein the back adhesive film is provided with an opening at the position where the lead-out wire is led out, and the photovoltaic module further comprises a filling adhesive film arranged on the side of the back adhesive film away from the cell group and covering the opening, the filling adhesive film has a plurality of slits at the corresponding positions of the opening, and the plurality of slits form an intersection, and the lead-out wire passes through the opening of the back adhesive film and is led out from the intersection position of the filling adhesive film.
2. The photovoltaic module of claim 1, wherein, The back adhesive film has a plurality of openings, and the filling adhesive film is in a strip shape and covers the plurality of openings of the back adhesive film.
3. The photovoltaic module of claim 1, wherein, The back adhesive film has a plurality of openings, and the filling adhesive film is in a block shape and has a plurality of openings, and each of the filling adhesive films covers a single opening of the back adhesive film.
4. The photovoltaic module of claim 1, wherein, The plurality of slits form a circle with the intersection as the center at the position where the lead-out wire passes through.
5. The photovoltaic module of claim 1, wherein, When the lead-out wire passes out from the intersection position, at least part of the filling adhesive film at the corresponding position is opened along the plurality of slits, the filling adhesive film between adjacent slits forms a page, and a plurality of pages are opened to form a channel through which the lead-out wire passes.
6. The photovoltaic module of claim 5, wherein, The page also has an indentation, and the page is bent at the indentation when opened.
7. The photovoltaic module of claim 1, wherein, The opening of the back adhesive film is circular or elliptical.
8. A photovoltaic module, characterized by, The photovoltaic module comprises a front plate glass, a front adhesive film, a cell group, a back adhesive film and a back plate which are sequentially stacked; the cell group comprises a plurality of cell strings and bus bars connected with the plurality of cell strings, the bus bars form lead-out wires which pass through the back adhesive film and the back plate to extend to the outside of the photovoltaic module; wherein the back adhesive film has a plurality of slits at the position where each of the lead-out wires passes through, and the plurality of slits form an intersection, and the lead-out wire passes out from the intersection position.
9. The photovoltaic module of claim 8, wherein, The plurality of slits form a circle with the intersection as the center at the position where the lead-out wire passes through.
10. The photovoltaic module of claim 8, wherein, When the lead-out wire passes out from the intersection position, at least part of the back adhesive film at the corresponding position is opened along the plurality of slits, the back adhesive film between adjacent slits forms a page, and a plurality of pages are opened to form a channel through which the lead-out wire passes. The page also has an indentation, and the page is bent at the indentation when opened.