Bus structure, conductive back plate and photovoltaic module

Abstract

This utility model discloses a busbar structure, a conductive backsheet, and a photovoltaic module. The busbar structure includes at least one first central busbar and at least one second central busbar; the first and second central busbars are spaced apart along their length; a first lead wire is provided at one end of the first central busbar near the second central busbar; a second lead wire and a lead-out hole are provided at one end of the second central busbar near the first central busbar; before the photovoltaic module is laminated, the first lead wire is detachably inserted into the lead-out hole, causing the first and second lead wires to intersect each other; after the photovoltaic module is laminated, the first lead wire is removed from the lead-out hole. This embodiment can solve the problems of large bending angles of the first and second lead wires and stress concentration caused by the rounded corners of the bending portions, reducing the probability of microcracks and fragmentation of the solar cells during the lamination process.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a busbar structure, a conductive backsheet and a photovoltaic module. Background Technology

[0002] The busbar leads of photovoltaic (PV) modules are typically folded 180° and led out from the wiring holes on the backsheet before the PV module is laminated. During the lamination process, the bends created by the folded leads will cause stress concentration points at the locations of the solar cells, which can easily lead to problems such as fragmentation and microcracks during lamination, reducing the yield of PV modules and hindering mass production. Utility Model Content

[0003] In view of this, the present invention provides a busbar structure, a conductive backsheet and a photovoltaic module, which can solve the problems of large bending angles of the first and second leads and stress concentration caused by the rounded corners of the bending parts, and reduce the probability of microcracks and fragments in the solar cells during the lamination process.

[0004] To achieve the above objectives, according to one aspect of the present invention, a busbar structure is provided for use in a photovoltaic module, comprising:

[0005] At least one first central bus bar and at least one second central bus bar, wherein the first central bus bar and the second central bus bar are arranged at intervals along their length direction;

[0006] The first central busbar is provided with a first lead wire at one end near the second central busbar; the second central busbar is provided with a second lead wire and a lead hole at one end near the first central busbar.

[0007] Before the photovoltaic module is laminated, the first lead is detachably inserted into the lead hole, such that the first lead and the second lead cross each other.

[0008] After the photovoltaic module is laminated, the first lead wire is removed from the lead hole.

[0009] Optionally, the second central busbar has a lead-out hole opening area at one end near the first central busbar, and the second lead wire is located at the end of the lead-out hole opening area near the first central busbar.

[0010] Wherein, the width of the opening area of ​​the aforementioned lead hole is greater than the width of the second lead wire, and the width of the aforementioned first lead wire is less than the width of the aforementioned lead hole;

[0011] The width of the first lead is equal to the width of the second lead.

[0012] Optionally, the aforementioned first central busbar includes a first busbar body and a plurality of first protruding portions disposed on one or both sides of the aforementioned first busbar body;

[0013] Optionally, the first protrusion is provided with a first electrode perforation.

[0014] Optionally, the aforementioned second central busbar includes a second busbar body and a plurality of second protruding portions disposed on one or both sides of the aforementioned second busbar body;

[0015] Optionally, the second protrusion is provided with a second electrode perforation.

[0016] To achieve the above objectives, according to another aspect of the present invention, a conductive backsheet is provided for use in photovoltaic modules, comprising:

[0017] The plate, adhesive layer, and flow busbar are stacked in sequence.

[0018] The aforementioned bus layer includes at least one bus structure according to an embodiment of the present invention;

[0019] The aforementioned plate and adhesive layer are provided with wiring holes, which are used to lead out the first lead and the second lead of the aforementioned bus structure.

[0020] Optionally, it may also include a release film;

[0021] The release film is disposed around the perimeter of the wiring hole and below the busbar layer at a position corresponding to the wiring hole.

[0022] Optionally, the width of the release film disposed below the above-mentioned busbar layer is greater than or equal to the diameter of the above-mentioned wiring hole.

[0023] Optionally, the aforementioned busbar layer includes the aforementioned busbar structure disposed in the middle region of the aforementioned plate and the end busbar strip disposed at the edge of the aforementioned plate;

[0024] The inner side of the aforementioned end busbar is provided with a plurality of third protrusions arranged at intervals; each of the aforementioned third protrusions is provided with a third electrode through hole.

[0025] To achieve the above objectives, according to another aspect of the present invention, a photovoltaic module is provided, comprising a cover plate, a front encapsulation film, a cell array, a rear encapsulation film, and a conductive backplate stacked sequentially, wherein the conductive backplate is any of the conductive backplates described in the embodiments of the present invention.

[0026] To achieve the above objectives, according to another aspect of the present invention, a photovoltaic module is provided, comprising a cover plate, a front encapsulation film, a cell array, a rear encapsulation film, and a back sheet stacked sequentially. The cell array includes multiple solar cell strings and a busbar structure for drawing out the current from the solar cell strings. The busbar structure is any of the busbar structures described in the present invention.

[0027] One embodiment of the above-mentioned utility model has the following advantages or beneficial effects: the busbar structure includes at least one first central busbar and at least one second central busbar, and a first lead wire is provided at one end of the first central busbar near the second central busbar, and a second lead wire and a lead hole are provided at one end of the second central busbar near the first central busbar, so that the first lead wire can be detachably inserted into the lead hole before the photovoltaic module is laminated, so that the first lead wire and the second lead wire are stacked in a cross manner, which solves the problem of large bending angle of the first lead wire and the second lead wire and stress concentration caused by the rounded corner of the bending part, reduces the probability of microcracks and fragments in the solar cell during the lamination process, improves the yield and aesthetics of the photovoltaic module, and can be applied to the large-scale production of photovoltaic modules.

[0028] After the photovoltaic module is laminated, the first lead can be removed from the lead hole so that the first and second leads can be connected to the corresponding lines in the junction box, avoiding problems such as leakage and short circuit caused by the first and second leads overlapping or coming into contact with each other, thus improving the power generation efficiency of the photovoltaic module.

[0029] The further effects of the aforementioned unconventional alternative methods will be explained below in conjunction with specific implementation methods. Attached Figure Description

[0030] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein:

[0031] Figure 1 This is a schematic diagram of the busbar structure according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of a busbar structure according to another embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the separated first central busbar and the second central busbar according to an embodiment of the present invention;

[0034] Figure 4 yes Figure 1 Enlarged view of point A in the middle;

[0035] Figure 5This is a schematic diagram showing the electrical connection between the busbar structure and the electrodes in the solar cell according to an embodiment of the present invention;

[0036] Figure 6 This is a structural schematic diagram of the conductive backplate before or during the lamination process according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure after the conductive backplate is laminated according to an embodiment of the present utility model;

[0038] Figure 8 This is a schematic diagram of the structure of the busbar layer in the conductive backplane according to an embodiment of the present invention;

[0039] Figure 9 This is a schematic diagram of the end busbar according to an embodiment of the present utility model;

[0040] Figure 10 This is a schematic diagram of the structure of the post-encapsulation film and conductive backsheet in a photovoltaic module according to an embodiment of the present invention.

[0041] Figure label:

[0042] 1-Bus structure; 11-First central busbar; 111-First lead-out wire; 112-First busbar body; 113-First protruding part; 1131-First electrode through hole; 12-Second central busbar; 121-Second lead-out wire; 122-Lead-out hole opening area; 1221-Lead-out hole; 123-Second busbar body; 124-Second protruding part; 1241-Second electrode through hole;

[0043] 2-Conductive backplate; 21-Board body; 211-Wiring hole; 22-Adhesive layer; 23-Bus layer; 231-End busbar; 2311-Third protrusion; 23111-Third electrode perforation; 24-Release film;

[0044] 3-Post-encapsulation film; 31-Insulating part; 32-Electrode conduction port Detailed Implementation

[0045] Current photovoltaic (PV) modules mainly consist of a cover plate, a front encapsulating film, a solar cell string, a rear encapsulating film, and a backsheet, stacked sequentially. Each solar cell string has busbars at both ends to conduct the current through the entire string. These busbars are typically located between the solar cell string and the rear encapsulating film, and some busbars have leads at both ends for connection to a junction box. Adjacent busbars are connected to electrodes of different polarities within the solar cell string to impart different polarities. For example, two adjacent busbars extending in the same straight line may have one connected to the negative electrode of one solar cell string and the other connected to the positive electrode of another solar cell string, thus giving these two busbars different polarities.

[0046] Busbars equipped with lead wires can be led out from photovoltaic modules through wiring holes in the backsheet and encapsulation film to connect to junction boxes and discharge the collected current.

[0047] After photovoltaic modules are stacked in sequence with cover plate, front encapsulation film, solar cell string, rear encapsulation film and backsheet, they need to be laminated to bond the various materials into a whole through high temperature and high pressure, thereby enhancing their structural stability and reducing the risk of failure during long-term outdoor use.

[0048] Before lamination, the leads of adjacent busbars in the photovoltaic module are led out from the wiring holes to prevent the encapsulant film from bonding the leads and preventing them from being led out after lamination. Currently, the common method is to fold the leads 180° and flatten them to form a folded edge before lamination. However, this method results in a large-angle bend in the busbar, and the stress concentration points caused by the bend cannot be eliminated, which can lead to breakage of photovoltaic modules during lamination, and the reduction in the probability of breakage is limited.

[0049] Based on this, the present invention provides a busbar structure, a conductive backsheet, and a photovoltaic module, in order to solve at least one technical problem existing in the prior art.

[0050] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These embodiments should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0051] It should be noted that, where there is no conflict, the embodiments of this utility model and the technical features thereof can be combined with each other.

[0052] Figure 1 This is a schematic diagram of the busbar structure 1 according to an embodiment of the present utility model. Figure 2 This is a schematic diagram of another busbar structure 1 according to an embodiment of the present utility model. Figure 1 and Figure 2 As shown, the current bus structure 1 applied to a photovoltaic module according to an embodiment of the present invention includes: at least one first central bus bar 11 and at least one second central bus bar 12, wherein the first central bus bar 11 and the second central bus bar 12 are arranged at intervals along their length direction. The first central bus bar 11 and the second central bus bar 12 are connected to each other during photovoltaic module lamination and are separated after photovoltaic module lamination.

[0053] like Figure 3As shown, the first central busbar 11 includes a first busbar body 112 and a first lead wire 111; the second central busbar 12 includes a second busbar body 123, a second lead wire 121, and a lead-out hole opening area 122, with a lead-out hole 1221 formed in the lead-out hole opening area 122. The first lead wire 111 is located at one end of the first central busbar 11 near the second central busbar 12; both the second lead wire 121 and the lead-out hole opening area 122 are located at one end of the second central busbar 12 near the first central busbar 11. The width of the first lead wire 111 is smaller than the width of the lead-out hole 1221, so that the first lead wire 111 can be easily inserted into or removed from the lead-out hole 1221.

[0054] Optionally, in the second central busbar 12, the second lead 121 is disposed at one end of the lead hole opening area 122 near the first central busbar 11. The width of the lead hole opening area 122 is greater than the width of the second lead 121, thereby ensuring that the lead hole opening area 122 has sufficient width to open the lead hole 1221, so that the width of the lead hole 1221 is greater than the width of the first lead 111. The width of the first lead 111 is equal to the width of the second lead 121.

[0055] The bus structure 1 may include one or more first central bus bars 11 and one or more second central bus bars 12.

[0056] Furthermore, when the number of parallel solar cell strings in a photovoltaic module is small, or when the number of junction boxes in a photovoltaic module is only one, such as Figure 1 As shown, the busbar structure 1 may include only one first central busbar 11 and one second central busbar 12. The first central busbar 11 has a first lead wire 111 only at the end closest to the second central busbar 12, and the second central busbar 12 has a second lead wire 121 and a lead hole 1221 only at the end closest to the first central busbar 11. The first lead wire 111 and the second lead wire 121 are led out from the wiring holes 211 in the rear encapsulation film 3 and the backsheet and connected to a junction box. When the number of parallel solar cell strings in the photovoltaic module is large or the number of junction boxes in the photovoltaic module is more than one, such as... Figure 2As shown, the busbar structure 1 may include a second central busbar 12 and two first central busbars 11. The two ends of the second central busbar 12 may be connected to the corresponding first central busbar 11 respectively. In this case, both ends of the second central busbar 12 are provided with lead-out holes 1221 and second lead wires 121. Similarly, as the number of parallel solar cell strings and junction boxes increases, the busbar structure 1 may include multiple second central busbars 12 and multiple first central busbars 11 (not shown). In this case, the first central busbar 11 connected to the multiple second central busbars 12 is provided with first lead wires 111 at both ends, and the second central busbar 12 connected to the multiple first central busbars 11 is provided with second lead wires 121 and lead-out holes 1221 at both ends.

[0057] like Figure 4 As shown, before the photovoltaic module is laminated, the first lead 111 is detachably inserted into the lead hole 1221. After the photovoltaic module is laminated, the first lead 111 is removed from the lead hole 1221. Specifically, since the polarities of the first lead 111 and the second lead 121 are different, before lamination, when the photovoltaic module is not in operation, the first lead 111 of the first central busbar 11 is inserted into the lead hole 1221 of the second central busbar 12, and crosses with the second lead 121 of the second central busbar 12. After lamination, to avoid short circuits or leakage, the first lead 111 can be removed from the lead hole 1221, and the first lead 111 and the second lead 121 can be connected to the wiring in the junction box.

[0058] In one alternative embodiment, such as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the first central busbar 11 may further include a plurality of first protrusions 113. Specifically, the plurality of first protrusions 113 are spaced apart to be electrically connected to the electrodes in the solar cell through the first protrusions 113.

[0059] Furthermore, when the first central busbar 11 is disposed in the middle region of the photovoltaic module, a plurality of first protruding portions 113 are disposed on both sides of the first busbar body 112, and are separated on either side; when the first central busbar 11 is disposed in the edge region of the photovoltaic module, a plurality of first protruding portions 113 are disposed on the same side of the first busbar body 112, and are separated on that side.

[0060] Optionally, the first protruding portion 113 is provided with a first electrode through-hole 1131, thereby utilizing the conductive material on the electrode of the solar cell to achieve electrical connection between the electrode and the first central busbar 11 through the first electrode through-hole 1131. The conductive material can be conductive adhesive or solder paste applied to the electrode, and is not limited to these.

[0061] Similarly, the second central busbar 12 may also include a plurality of second protrusions 124. Specifically, the plurality of second protrusions 124 are spaced apart to be electrically connected to electrodes in the solar cell via the second protrusions 124.

[0062] Furthermore, when the second central busbar 12 is disposed in the middle region of the photovoltaic module, a plurality of second protrusions 124 are disposed on both sides of the second busbar body 123, and are separated on either side; when the second central busbar 12 is disposed in the edge region of the photovoltaic module, a plurality of second protrusions 124 are disposed on the same side of the second busbar body 123, and are separated on that side.

[0063] Optionally, the second protruding portion 124 is provided with a second electrode through-hole 1241, thereby utilizing the conductive material on the electrode of the solar cell to achieve electrical connection between the electrode and the second central busbar 12 through the second electrode through-hole 1241. The conductive material can be conductive adhesive or solder paste applied to the electrode, and is not limited to these.

[0064] By setting a first protruding portion 113 in the first central busbar 11 and a second protruding portion 124 in the second central busbar 12, the problem of large space occupied by the busbar due to the need to lead the electrodes out to the busbar in traditional photovoltaic modules is solved. The width of the first busbar body 112 and the second busbar body 123 is reduced, making the space occupied by the first central busbar 11 and the second central busbar 12 smaller. This can further increase the space ratio of the solar cells in the photovoltaic module and improve the space utilization rate of the photovoltaic module.

[0065] The busbar structure 1 of this utility model embodiment, by setting a first central busbar 11 and a second central busbar 12, and setting a first lead wire 111 at one end of the first central busbar 11 near the second central busbar 12, and setting a second lead wire 121 and a lead hole 1221 at one end of the second central busbar 12 near the first central busbar 11, so that the first lead wire 111 can be detachably inserted into the lead hole 1221 before the photovoltaic module is laminated, so that the first lead wire 111 and the second lead wire 121 are arranged in a cross-layered manner, which solves the problem of large bending angle of the first lead wire 111 and the second lead wire 121 and stress concentration caused by the rounded corner of the bending part, reduces the probability of microcracks and fragments in the solar cell during the lamination process, and improves the yield and aesthetics of the photovoltaic module.

[0066] After the photovoltaic module is laminated, the first lead 111 can be detached from the lead hole 1221 so that the first lead 111 and the second lead 121 can be connected to the corresponding lines in the junction box, thereby avoiding leakage and short circuit problems caused by the first lead 111 and the second lead 121 overlapping or coming into contact with each other, and improving the power generation efficiency of the photovoltaic module.

[0067] Figure 6 This is a structural schematic diagram of the conductive backplate 2 before or during lamination according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the conductive backplate 2 after lamination according to an embodiment of the present invention. Figure 6 and Figure 7 As shown, the conductive backplate 2 of this utility model embodiment includes: a plate body 21, an adhesive layer 22 and a busbar layer 23 stacked in sequence.

[0068] The plate 21 can be made of glass or TPT material, and its surface can be coated with functional coatings or films, such as anti-reflective coatings, hardening and wear-resistant coatings, and water-blocking coatings. TPT material refers to a laminated material formed by sequentially stacking polyvinyl fluoride (PVF) film, polyethylene terephthalate (PET) film, and PVF film.

[0069] The aforementioned plate 21 and adhesive layer 22 are provided with wiring holes 211, which are used to lead out the first lead 111 and the second lead 121 of the aforementioned bus structure 1.

[0070] The adhesive layer 22 may include ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), or EPE (EVA-POE copolymer), etc.

[0071] The aforementioned busbar 23 includes at least one busbar structure 1 as described in this embodiment of the present invention.

[0072] In one optional embodiment of this utility model, such as Figure 7 As shown, the conductive backplate 2 may further include a release film 24. The release film 24 is disposed around the periphery of the wiring hole 211 and below the busbar layer 23 at a position corresponding to the wiring hole 211.

[0073] Because the adhesive in the adhesive layer 22 and the adhesive in the post-encapsulation film 3 between the conductive backplate 2 and the solar cell string may flow due to heat during lamination, in order to prevent the flowing adhesive from contacting the first lead 111, the second lead 121, and the lead hole 1221, causing the first central bus bar 11 and the second central bus bar 12 to stick together and making it difficult to remove the first lead 111 from the lead hole 1221 or separate the first lead 111 and the second lead 121 after lamination, a release film 24 for blocking the adhesive can be provided at the periphery of the wiring hole 211 and at the position below the bus layer 23 corresponding to the wiring hole 211. The position below the bus layer 23 corresponding to the wiring hole 211 refers to the position between the bus layer 23 and the post-encapsulation film 3 corresponding to the wiring hole 211.

[0074] It should be noted that the release film 24 provided around the wiring hole 211 needs to wrap the edges of the plate 21 and the adhesive layer 22 around the wiring hole 211 in order to isolate the adhesive layer 22 around the wiring hole 211 and the part of the busbar structure 1 passing through the wiring hole 211.

[0075] Optionally, the width of the release film 24 disposed below the busbar layer 23 is greater than or equal to the diameter of the wiring hole 211, so as to completely block the adhesive of the encapsulating film 3 through the release film 24 and prevent it from intruding into the connection part of the first central busbar 11 and the second central busbar 12.

[0076] Furthermore, the release film 24 can be made of a material that is resistant to lamination temperature, such as PET or polyimide (PI), thereby avoiding the deformation of the release film 24 caused by lamination temperature, which would lead to the inability to block the adhesive.

[0077] In an optional embodiment of this utility model, the aforementioned busbar structure 1 includes the aforementioned busbar structure 1 disposed in the middle region of the aforementioned plate 21 and end busbars 231 disposed at the edge of the aforementioned plate 21. At this time, solar cell strings are disposed on both sides of the first central busbar 11 and the second central busbar 12. The first central busbar 11 is electrically connected to the electrodes of the solar cell strings through first protrusions 113 disposed on both sides of its first busbar body 112, and the second central busbar 12 is electrically connected to the electrodes of the solar cell strings through second protrusions 124 disposed on both sides of its second busbar body 123.

[0078] like Figure 8 As shown, the aforementioned end busbar 231 is used to electrically connect to the end of the electrode in the solar cell string near the edge of the plate 21.

[0079] Among them, such as Figure 9 As shown, the inner side of the aforementioned end busbar 231 is provided with a plurality of third protrusions 2311 arranged at intervals; each of the aforementioned third protrusions 2311 is provided with a third electrode through hole 23111, thereby utilizing the conductive material on the electrode of the solar cell to achieve electrical connection between the electrode and the end busbar 231 through the third electrode through hole 23111. The conductive material can be conductive adhesive or solder paste applied to the electrode, etc., and is not limited to these.

[0080] It should be noted that the inner side of the end busbar 231 refers to the side of the end busbar 231 that is close to the solar cell string.

[0081] The working principle of the conductive backplate 2 in this embodiment of the utility model is as follows: Before the photovoltaic module is laminated, the conductive material on the electrodes of the solar cells can be used to achieve electrical connection between the electrodes and the busbars through the first conductive perforation in the first central busbar 11, the second electrode perforation 1241 in the second central busbar 12, and the third conductive perforation (if any) in the end busbar 231. Simultaneously, as... Figure 6 As shown, the first lead 111 of the first central busbar 11 in the busbar structure 1 can be inserted into the lead hole 1221 of the adjacent second central busbar 12, so that the first lead 111 and the second lead 121 are cross-layered and attached to the outer surface of the backsheet, and then laminated. This solves the problem of large bending angles of the first lead 111 and the second lead 121 and stress concentration caused by the rounded corners of the bending parts, reduces the probability of microcracks and fragments in the solar cells during the lamination process, and improves the yield and aesthetics of the photovoltaic module; Figure 7As shown, after the photovoltaic module is laminated, the first lead 111 can be detached from the lead hole 1221, and the first lead 111 can be folded so that it forms a 90° angle with the first busbar body 112, and the second lead 121 can be folded so that it forms a 90° angle with the second busbar body 123. This allows the first lead 111 and the second lead 121 to be connected to the corresponding lines in the junction box, avoiding problems such as leakage and short circuit caused by the first lead 111 and the second lead 121 overlapping or coming into contact with each other, thereby improving the power generation efficiency of the photovoltaic module.

[0082] According to the embodiment of the present invention, the conductive backplate 2 is formed by combining the busbar structure 1 with the plate body 21 of the backplate, thereby solving the problem that the busbar structure 1 occupies a large space when it is placed at the end of the solar cell string or between adjacent solar cell strings. This can increase the space ratio of solar cells in the photovoltaic module and improve the space utilization rate of the photovoltaic module.

[0083] This embodiment of the invention also provides a photovoltaic module, comprising a cover plate, a front encapsulation film, a cell array, a rear encapsulation film 3, and a conductive backplate 2, which are stacked sequentially. The cell array includes one or more solar cell strings.

[0084] The stacking order of the photovoltaic module from the light-receiving surface to the back-lighting surface is as follows: cover plate, front encapsulation film, cell array, rear encapsulation film 3, and conductive backplate 2.

[0085] The aforementioned pre-encapsulation film and post-encapsulation film 3 may include ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), or EPE (EVA-POE copolymer), etc.

[0086] In an optional embodiment of this utility model, the conductive backplate 2 includes: a plate body 21, an adhesive layer 22, and a busbar layer 23 stacked sequentially. The busbar layer 23 includes the busbar structure 1 described in this embodiment of the utility model.

[0087] The aforementioned bus structure 1 includes at least one first central bus bar 11 and at least one second central bus bar 12, wherein the first central bus bar 11 and the second central bus bar 12 are arranged at intervals along their length. The first central bus bar 11 includes a first bus bar body 112 and a first lead wire 111; the second central bus bar 12 includes a second bus bar body 123, a second lead wire 121, and a lead-out hole opening area 122, wherein a lead-out hole 1221 is formed in the lead-out hole opening area 122. The first lead wire 111 is located at one end of the first central bus bar 11 near the second central bus bar 12; both the second lead wire 121 and the lead-out hole opening area 122 are located at one end of the second central bus bar 12 near the first central bus bar 11.

[0088] Before the photovoltaic module is laminated, the first lead 111 is detachably inserted into the lead hole 1221. After the photovoltaic module is laminated, the first lead 111 is removed from the lead hole 1221. Specifically, since the polarities of the first lead 111 and the second lead 121 are different, before the photovoltaic module is put into operation, the first lead 111 of the first central busbar 11 is inserted into the lead hole 1221 of the second central busbar 12 and crosses with the second lead 121 of the second central busbar 12. After the lamination is completed, in order to avoid short circuits or leakage, the first lead 111 can be removed from the lead hole 1221, and the first lead 111 and the second lead 121 can be connected to the wiring in the junction box.

[0089] In one optional embodiment of this utility model, such as Figure 10 As shown, the encapsulating film 3 may include an insulating portion 31 and an electrode through-hole 32 corresponding to each first protrusion 113, second protrusion 124 and third protrusion 2311. The conductive material of each solar cell string electrode in the battery array can be electrically connected to the first protrusion 113 of the first central busbar 11, the second protrusion 124 of the second central busbar 12 and the third protrusion 2311 of the end busbar 231 through the electrode through-hole 32.

[0090] According to the photovoltaic module of this utility model embodiment, by using a conductive backplate 2 with a current-collecting layer 23, the problem of large space occupation by the current-collecting structure 1 and the end current-collecting strip 231 is solved, which can correspondingly increase the space ratio of solar cells in the photovoltaic module and improve the space utilization rate of the photovoltaic module.

[0091] By setting up a busbar structure 1 with a first central busbar 11 and a second central busbar 12, and setting a first lead wire 111 at one end of the first central busbar 11 near the second central busbar 12, and setting a second lead wire 121 and a lead hole 1221 at one end of the second central busbar 12 near the first central busbar 11, the first lead wire 111 can be detachably inserted into the lead hole 1221 before the photovoltaic module is laminated, so that the first lead wire 111 and the second lead wire 121 are stacked in a cross manner. This solves the problem of large bending angles of the first lead wire 111 and the second lead wire 121 and stress concentration caused by the rounded corners of the bending parts, reduces the probability of microcracks and fragments in the solar cells during the lamination process, and improves the yield and aesthetics of the photovoltaic module.

[0092] After the photovoltaic module is laminated, the first lead 111 can be detached from the lead hole 1221 so that the first lead 111 and the second lead 121 can be connected to the corresponding lines in the junction box, thereby avoiding leakage and short circuit problems caused by the first lead 111 and the second lead 121 overlapping or coming into contact with each other, and improving the power generation efficiency of the photovoltaic module.

[0093] This embodiment of the invention also provides a photovoltaic module, comprising a cover plate, a back sheet, a cell array, an encapsulating film, and a busbar structure 1 of this embodiment, stacked sequentially. The encapsulating film includes a front encapsulating film and a rear encapsulating film 3. The cell array includes one or more solar cell strings.

[0094] The stacking order of the photovoltaic module from the light-receiving side to the back-lighting side is: cover plate, front encapsulation film, cell array, rear encapsulation film 3, and back sheet.

[0095] The battery array includes multiple solar cell strings and a busbar structure 1 that draws out the current from the solar cell strings. The busbar structure 1 can be located at the end of the solar cell strings or between adjacent solar cell strings.

[0096] The aforementioned bus structure 1 includes a first central bus bar 11 and a second central bus bar 12, which are arranged at intervals along their length. The first central bus bar 11 includes a first bus bar body 112 and a first lead wire 111; the second central bus bar 12 includes a second bus bar body 123, a second lead wire 121, and a lead-out hole opening area 122, with a lead-out hole 1221 formed in the lead-out hole opening area 122. The first lead wire 111 is located at one end of the first central bus bar 11 near the second central bus bar 12; both the second lead wire 121 and the lead-out hole opening area 122 are located at one end of the second central bus bar 12 near the first central bus bar 11.

[0097] Before the photovoltaic module is laminated, the first lead 111 is detachably inserted into the lead hole 1221. After the photovoltaic module is laminated, the first lead 111 is removed from the lead hole 1221. Specifically, since the polarities of the first lead 111 and the second lead 121 are different, before the photovoltaic module is put into operation, the first lead 111 of the first central busbar 11 is inserted into the lead hole 1221 of the second central busbar 12 and crosses with the second lead 121 of the second central busbar 12. After the lamination is completed, in order to avoid short circuits or leakage, the first lead 111 can be removed from the lead hole 1221, and the first lead 111 and the second lead 121 can be connected to the wiring in the junction box.

[0098] The photovoltaic module of this utility model embodiment includes a busbar structure 1 as described in any of the embodiments of this utility model. The busbar structure 1 includes a first central busbar 11 and a second central busbar 12. Since the first central busbar 11 has a first protruding portion 113 and the second central busbar 12 has a second protruding portion 124, and these portions are electrically connected to the electrodes of the solar cell strings, the space occupied by the busbar body is reduced, and the spacing between the solar cell strings or the distance between the solar cell strings and the edge of the photovoltaic module is decreased. This further reduces the space occupied by the first central busbar 11 and the second central busbar 12, thereby increasing the space ratio of the solar cells in the photovoltaic module and improving the space utilization rate of the photovoltaic module.

[0099] By providing a first lead wire 111 at one end of the first central busbar 11 near the second central busbar 12, and providing a second lead wire 121 and a lead hole 1221 at one end of the second central busbar 12 near the first central busbar 11, the first lead wire 111 can be detachably inserted into the lead hole 1221 before the photovoltaic module is laminated. This allows the first lead wire 111 and the second lead wire 121 to be stacked in a cross manner, solving the problem of large bending angles of the first lead wire 111 and the second lead wire 121 and stress concentration caused by the rounded corners of the bending parts. This reduces the probability of microcracks and fragments appearing in the solar cells during the lamination process, and improves the yield and aesthetics of the photovoltaic module.

[0100] After the photovoltaic module is laminated, the first lead 111 can be detached from the lead hole 1221 so that the first lead 111 and the second lead 121 can be connected to the corresponding lines in the junction box, thereby avoiding leakage and short circuit problems caused by the first lead 111 and the second lead 121 overlapping or coming into contact with each other, and improving the power generation efficiency of the photovoltaic module.

[0101] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A busbar structure, characterized in that, Applied to photovoltaic modules, including: At least one first central busbar (11) and at least one second central busbar (12), the first central busbar (11) and the second central busbar (12) being spaced apart along their length direction; The first central busbar (11) is provided with a first lead wire (111) at one end near the second central busbar (12); the second central busbar (12) is provided with a second lead wire (121) and a lead hole (1221) at one end near the first central busbar (11). Before the photovoltaic module is laminated, the first lead (111) is detachably inserted into the lead hole (1221) such that the first lead (111) and the second lead (121) cross each other; After the photovoltaic module is laminated, the first lead (111) is removed from the lead hole (1221).

2. The busbar structure according to claim 1, characterized in that, The second central busbar (12) has a lead-out hole opening area (122) for opening the lead-out hole (1221) at one end near the first central busbar (11), and the second lead wire (121) is located at the end of the lead-out hole opening area (122) near the first central busbar (11). The width of the lead-out hole opening area (122) is greater than the width of the second lead-out line (121), and the width of the first lead-out line (111) is less than the width of the lead-out hole (1221). The width of the first lead (111) is equal to the width of the second lead (121).

3. The busbar structure according to claim 1, characterized in that, The first central busbar (11) includes a first busbar body (112) and a plurality of first protruding portions (113) disposed on one or both sides of the first busbar body (112). The first protruding portion (113) is provided with a first electrode through hole (1131).

4. The busbar structure according to claim 3, characterized in that, Also includes: The second central busbar (12) includes a second busbar body (123) and a plurality of second protruding portions (124) disposed on one or both sides of the second busbar body (123). The second protruding portion (124) is provided with a second electrode through hole (1241).

5. A conductive backplate, characterized in that, Applied to photovoltaic modules, including: The plate (21), adhesive layer (22) and flow layer (23) are stacked in sequence. The busbar (23) includes at least one busbar structure (1) as described in any one of claims 1 to 4; The plate (21) and the adhesive layer (22) are provided with wiring holes (211), which are used to lead out the first lead (111) and the second lead (121) of the bus structure (1).

6. The conductive backplate according to claim 5, characterized in that, It also includes release film (24); The release film (24) is disposed around the periphery of the wiring hole (211) and below the busbar layer (23) at a position corresponding to the wiring hole (211).

7. The conductive backplate according to claim 6, characterized in that, The width of the release film (24) disposed below the busbar layer (23) is greater than or equal to the diameter of the wiring hole (211).

8. The conductive backplate according to claim 5, characterized in that, The busbar (23) includes the busbar structure (1) disposed in the middle region of the plate (21) and the end busbar (231) disposed at the edge of the plate (21). The inner side of the end busbar (231) is provided with a plurality of third protrusions (2311) arranged at intervals; each of the third protrusions (2311) is provided with a third electrode through hole (23111).

9. A photovoltaic module, comprising a cover plate, a front encapsulation film, a cell array, a rear encapsulation film, and a conductive backplate stacked sequentially (2), characterized in that, The conductive backplate (2) is the conductive backplate (2) as described in any one of claims 5-8.

10. A photovoltaic module, comprising a cover plate, a front encapsulating film, a cell array, a rear encapsulating film, and a backsheet stacked sequentially, characterized in that, The battery array includes a plurality of solar cell strings and a bus structure (1) for drawing out the current from the solar cell strings, wherein the bus structure (1) is the bus structure (1) as described in any one of claims 1 to 4.

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